阅读说明：本技术 感应加热辊以及纺丝拉伸装置 (Induction heating roller and spinning stretching device ) 是由 加贺田翔 安川陆 于 2021-05-07 设计创作，主要内容包括：本发明涉及感应加热辊以及纺丝拉伸装置。在感应加热辊中有效地降低轴向上的辊主体的筒状部的温度偏差。感应加热辊(20)具备能够旋转的辊单元(30)以及线圈(52)。辊单元(30)具有：辊主体(31),具有沿着辊单元(30)的轴向延伸的外筒部(34)(筒状部),当在线圈(52)中流动电流时外筒部(34)被感应加热；均热部件(32),能够使在外筒部(34)中产生的热在轴向上移动,且在轴向上与外筒部(34)相比容易使热移动；以及发热部件(60),在轴向上配置在外筒部(34)的端部的位置,当在线圈(52)中流动电流时被感应加热。发热部件(60)由电阻率比构成外筒部(34)的材料以及构成均热部件(32)的材料低的材料形成。发热部件(60)与外筒部(34)以及均热部件(32)中的至少一方邻接配置。(The present invention relates to an induction heating roller and a spinning stretching apparatus. In an induction heating roller, temperature variation of a cylindrical portion of a roller main body in an axial direction is effectively reduced. The induction heating roller (20) is provided with a rotatable roller unit (30) and a coil (52). The roller unit (30) comprises: a roller body (31) having an outer tube section (34) (tubular section) extending in the axial direction of the roller unit (30), the outer tube section (34) being inductively heated when a current flows through the coil (52); a heat equalizing member (32) that can move heat generated in the outer tube (34) in the axial direction and that can more easily move heat in the axial direction than the outer tube (34); and a heat generating member (60) which is arranged at the position of the end of the outer tube (34) in the axial direction and is inductively heated when a current flows through the coil (52). The heat generating member (60) is formed of a material having a lower resistivity than the material constituting the outer tube section (34) and the material constituting the soaking member (32). The heat generating member (60) is disposed adjacent to at least one of the outer tube (34) and the heat equalizing member (32).)

1. An induction heating roller comprising a rotatable roller unit and a coil,

the roller unit includes:

a roller body having a cylindrical portion extending in an axial direction of the roller unit, the cylindrical portion being inductively heated when a current flows through the coil;

a heat equalizer that can move heat generated in the cylindrical portion in the axial direction and that can more easily move heat in the axial direction than the cylindrical portion; and

a heating portion which is arranged at an end portion of the cylindrical portion in the axial direction and is inductively heated when a current flows through the coil,

the heating part is made of a material having a lower resistivity than the material of the cylindrical part and the material of the soaking part,

the heat generating portion is disposed adjacent to at least one of the cylindrical portion and the heat equalizing portion.

2. An inductively heated roller as recited in claim 1,

the heat generating portion includes an annular heat generating member provided as a member different from the roller main body and the soaking portion and contacting at least one of the cylindrical portion and the soaking portion.

3. An inductively heated roller as recited in claim 1 or 2,

the heat equalizing portion includes a heat equalizing member that is provided as a member different from the roller main body and that is in contact with an inner peripheral surface of the cylindrical portion, and has a higher thermal conductivity coefficient in the axial direction than the cylindrical portion.

4. An inductively heated roller as recited in any of claims 1 to 3,

the soaking section is disposed inside the cylindrical section in the radial direction of the roller unit,

the heating part and the soaking part are arranged in the axial direction.

5. An inductively heated roller as recited in any of claims 1 to 4,

the heating part is disposed adjacent to the soaking part.

6. An inductively heated roller as recited in claim 5,

the heating part is disposed apart from the cylindrical part.

7. An inductively heated roller as recited in any of claims 1 to 5,

the heat generating portion is disposed adjacent to the cylindrical portion.

8. An inductively heated roller as recited in any of claims 1 to 7,

the roller main body has a circular plate portion extending from one end portion of the cylindrical portion in the axial direction toward a radial inner side of the roller unit,

the heat equalizing portion has a heat equalizing member that is provided as a member different from the roller main body and that is in contact with an inner peripheral surface of the cylindrical portion, and that has a higher thermal conductivity coefficient in the axial direction than the cylindrical portion,

the heat generating part has an annular heat generating member provided as a member different from the roller main body and the heat equalizing member and arranged in the axial direction from the heat equalizing member,

the induction heating roller is provided with a pressing portion that is disposed on the other side in the axial direction than the heat equalizing member and the heat generating member, and presses the heat equalizing member and the heat generating member toward the one side.

9. An inductively heated roller as recited in any of claims 1 to 8,

the roller body is supported by a cantilever,

the heat generating portion is disposed at an end portion of the cylindrical portion on the distal end side in the axial direction.

10. An inductively heated roller as recited in any of claims 1 to 9,

the heating part is made of nonmagnetic material.

11. An inductively heated roller as recited in any of claims 1 to 10,

the density of the heat generating portion is lower than at least the density of the cylindrical portion.

12. An inductively heated roller as recited in any of claims 1 to 11,

the coefficient of thermal conductivity of the material constituting the soaking portion is higher than the coefficient of thermal conductivity of the material constituting the cylindrical portion in the axial direction,

the material constituting the soaking section has a higher resistivity than the material constituting the cylindrical section in the circumferential direction of the roller unit.

13. A spinning stretching apparatus having the induction heating roller according to any one of claims 1 to 12,

a plurality of wires are wound around the cylindrical portion in the axial direction as a heating target.

Technical Field

The present invention relates to an induction heating roller and a spinning and drawing apparatus provided with the same.

Background

Patent documents 1 and 2 disclose induction heating rollers that heat a heating target (such as a yarn or toner). The induction heating roller includes a coil and a roller (hereinafter referred to as a roller unit) having an outer cylindrical portion (hereinafter referred to as a cylindrical portion) that is inductively heated. When a magnetic flux is generated by flowing an alternating current through the coil, an eddy current is generated in the circumferential direction of the cylindrical portion of the roller unit by electromagnetic induction, and the cylindrical portion generates heat by joule heat. By such induction heating, the heating target object in contact with the roller unit is heated.

Patent document 1: japanese patent laid-open publication No. 2018-35488

Patent document 2: japanese laid-open patent publication No. 10-31379

In general, in an induction heating roller, it is difficult for magnetic flux to uniformly flow in the axial direction of a roller unit (hereinafter, simply referred to as axial direction) due to leakage of magnetic flux, and heat generation of a cylindrical portion is difficult to be uniform in the axial direction. More specifically, the magnetic flux passing through the axial end portion of the cylindrical portion is smaller than the magnetic flux passing through the axial center portion of the cylindrical portion, and therefore the axial end portion is less likely to generate heat. In addition, in general, the area of the portion exposed to the outside air is larger at the axial end portion of the roller unit than at the axial center portion. Therefore, the axial end portion of the cylindrical portion is easily cooled by heat radiation. In this way, since heat generation and heat dissipation are difficult, there is a problem that the temperature of the axial end portion of the cylindrical portion is likely to be lower than the temperature of the axial center portion, and the temperature of the cylindrical portion is likely to vary in the axial direction.

In contrast, in the induction heating roller described in patent document 1, a heat equalizing portion (described as a heat equalizing member in patent document 1) having a higher heat conductivity coefficient in the axial direction than the cylindrical portion is in contact with the inner peripheral surface of the cylindrical portion. The heat generated in the cylindrical portion is easily conducted in the axial direction by the heat equalizer, and thus the temperature variation of the cylindrical portion in the axial direction can be reduced. However, the present inventors have found that there is still room for further improvement in such a structure.

In the induction heating roller described in patent document 2, a ring member having a lower resistivity than the cylindrical portion is in contact with an axial end portion of an inner peripheral surface of the cylindrical portion (described as a fixing roller in patent document 2). Since magnetic flux also passes through such a ring member, eddy current is generated in the ring member. Therefore, the amount of heat generated near the axial end of the cylindrical portion increases. This can suppress temperature variation in the axial direction of the cylindrical portion. However, in such a configuration, an excessive eddy current may flow in the ring member having a low resistivity, and the ring member may generate heat abnormally, which may deteriorate the temperature distribution of the cylindrical portion.

Disclosure of Invention

The purpose of the present invention is to effectively reduce temperature variation in a cylindrical portion of a roller body in an axial direction in an induction heating roller.

The induction heating roller of claim 1 is provided with a rotatable roller unit and a coil, and is characterized in that the roller unit includes: a roller body having a cylindrical portion extending in an axial direction of the roller unit, the cylindrical portion being inductively heated when a current flows through the coil; a heat equalizer that can move heat generated in the cylindrical portion in the axial direction and that can move heat more easily in the axial direction than the cylindrical portion; and a heat generating portion that is disposed at an end portion of the cylindrical portion in the axial direction, and that is inductively heated when a current flows through the coil, wherein the heat generating portion is formed of a material having a lower specific resistance than a material constituting the cylindrical portion and a material constituting the soaking portion, and is disposed adjacent to at least one of the cylindrical portion and the soaking portion.

In the present invention, the heat generating portion having a low resistivity is inductively heated, whereby the amount of heat generated in the vicinity of the axial end portion of the cylindrical portion can be increased. This can easily increase the temperature in the vicinity of the axial end of the cylindrical portion.

Further, in the present invention, the heat generating portion is disposed adjacent to at least one of the cylindrical portion and the heat equalizing portion. This enables heat generated in the heat generating portion to be directly transferred to the soaking portion or to be transferred to the soaking portion via the cylindrical portion. Therefore, the heat can be substantially uniformly transferred to the cylindrical portion of the roller main body in the axial direction by the heat equalizing portion. This can suppress an abnormal increase in temperature only at the axial end of the cylindrical portion.

As described above, in the induction heating roller, the temperature variation of the cylindrical portion of the roller main body in the axial direction can be effectively reduced.

The induction heating roller according to claim 2 is characterized in that, in the above-described invention 1, the heat generating portion has an annular heat generating member provided as a member different from the roller main body and the soaking portion and contacting at least one of the cylindrical portion and the soaking portion.

The heat generating portion made of a material having a lower resistivity than the cylindrical portion may be formed integrally with the cylindrical portion or the soaking portion by, for example, pressure welding. However, in such a configuration, the manufacturing time and manufacturing cost may increase. In the present invention, the annular heat generating component that can be easily and inexpensively manufactured is provided as a member different from the cylindrical portion and the soaking portion. Therefore, as compared with the case where the heat generating portion is integrally formed with the cylindrical portion or the heat equalizing portion, the increase in the manufacturing time and the manufacturing cost can be suppressed.

The induction heating roller of claim 3 is characterized in that, in the 1 st or 2 nd invention, the heat equalizing portion includes a heat equalizing member that is provided as a member different from the roller main body and that is in contact with an inner peripheral surface of the cylindrical portion, and that has a higher thermal conductivity coefficient in the axial direction than the cylindrical portion.

As the heat equalizing portion, for example, a jacket chamber in which a heat medium is sealed and which moves heat in the axial direction may be provided in the roller unit. However, in such a configuration, the structure of the roller unit may become complicated. In the present invention, the soaking section simply has a soaking member with a high thermal conductivity. Thus, for example, the structure of the roller unit can be simplified as compared with a configuration in which the jacket chamber is provided.

The induction heating roller according to claim 4 is characterized in that, in any one of the above-described 1 st to 3 rd inventions, the heat equalizing portion is disposed inside the cylindrical portion in a radial direction of the roller unit, and the heat generating portion and the heat equalizing portion are disposed in line in the axial direction.

In the configuration in which the heat equalizing portion is disposed radially inward of the cylindrical portion, for example, when the heat generating portion is disposed radially inward of the heat equalizing portion, the heat generating portion is radially distant from the cylindrical portion. In this case, among the heat generated in the heat generating portion, the amount of heat that is difficult to be transferred to the cylindrical portion and escape may increase, and the heating efficiency of the cylindrical portion may deteriorate. In the present invention, the heat generating portion and the heat equalizing portion are arranged in the axial direction. In other words, the heat generating portion is arranged in the vicinity of the cylindrical portion in the radial direction. Therefore, deterioration of the heating efficiency of the cylindrical portion can be suppressed.

The induction heating roller of claim 5 is characterized in that, in any one of the above 1 st to 4 th inventions, the heat generating portion is disposed adjacent to the heat equalizing portion.

In the present invention, the heat generated in the heat generating portion can be directly conducted to the soaking portion. Therefore, the temperature of the cylindrical portion can be efficiently equalized in the axial direction by the heat equalizing portion.

The induction heating roller according to claim 6 is characterized in that, in the above-described 5 th invention, the heat generating portion is disposed away from the cylindrical portion.

In the present invention, the heat generated in the heat generating portion is not directly conducted to the cylindrical portion, but indirectly conducted to the cylindrical portion via the soaking portion. Therefore, compared to the case where the heat generated in the heat generating portion is directly conducted to the cylindrical portion, it is possible to more reliably suppress the abnormal rise in temperature only at the axial end portion of the cylindrical portion.

The induction heating roller of claim 7 is characterized in that, in any one of the inventions 1 to 5, the heat generating portion is disposed adjacent to the cylindrical portion.

In the present invention, the heat generated in the heat generating portion can be directly transferred to the cylindrical portion. Therefore, the cylindrical portion can be heated efficiently, and therefore, such a configuration is effective when the amount of heat generated by the heat generating portion is small.

The induction heating roller of claim 8 is characterized in that, in any one of the above inventions 1 to 7, the roller main body has a disk portion extending from one end portion of the cylindrical portion in the axial direction to an inner side in the radial direction of the roller unit, the soaking portion has a soaking member, the soaking member is provided as a member different from the roller main body and is in contact with the inner peripheral surface of the cylindrical portion, and the heat transfer coefficient in the axial direction is higher than that of the cylindrical portion, the heat generating portion has an annular heat generating member, the heat generating member is provided as a member different from the roller body and the heat equalizing member and is arranged in the axial direction with the heat equalizing member, the induction heating roller is provided with a pressing portion, the pressing portion is disposed on the other side in the axial direction than the heat equalizing member and the heat generating member, and presses the heat equalizing member and the heat generating member toward the one side.

In the present invention, in a configuration in which the roller main body, the soaking member, and the heat generating member are provided as separate members, both the soaking member and the heat generating member can be pressed toward one side (the disk plate side) in the axial direction by one pressing portion. Thus, the soaking member and the heat generating member can be fixed to the roller body by being sandwiched between the pressing portion and the disk portion in the axial direction. Therefore, the heat generating member can be fixed to the roller body with a simple configuration, as compared with a case where the heat generating member and the soaking member are arranged at different positions in the radial direction.

The induction heating roller according to claim 9 is characterized in that, in any one of the above-described 1 st to 8 th aspects, the roller main body is supported in a cantilever manner, and the heat generating portion is disposed at a position of an end portion on the axial distal end side of the cylindrical portion.

In an induction heating roller in which a roller main body is supported in a cantilever manner, generally, the axial front end surface of the roller main body is exposed to outside air. Therefore, there is a problem that heat is radiated from the axial front end portion of the roller main body to a large extent and the temperature of the axial front end portion of the cylindrical portion is particularly liable to decrease. In this regard, in the present invention, since the vicinity of the axial direction distal end portion of the cylindrical portion is heated by the heat generating portion, a decrease in temperature of the axial direction distal end portion of the cylindrical portion can be effectively suppressed. Therefore, the temperature variation of the cylindrical portion can be effectively reduced.

An induction heating roller according to claim 10 is characterized in that, in any one of the inventions 1 to 9, the heat generating portion is made of a nonmagnetic material.

When the heat generating portion is made of a magnetic material such as carbon steel, the flow pattern of the magnetic flux may be changed as compared with the case where the heat generating portion is made of a non-magnetic material. Therefore, depending on the arrangement of the heat generating portions, for example, magnetic flux may not easily pass through the cylindrical portions, and heat generation of the cylindrical portions itself may be inhibited. In the present invention, the heat generating portion is made of a nonmagnetic material, and therefore, a situation in which the flow pattern of the magnetic flux is different from the originally desired flow pattern can be avoided.

The induction heating roller of claim 11 is characterized in that, in any one of the inventions 1 to 10, the density of the heat generating portion is lower than at least the density of the cylindrical portion.

In the present invention, the increase in weight of the induction heating roller due to the provision of the heat generating portion can be suppressed.

The induction heating roller according to claim 12 is characterized in that, in any one of the above-described 1 st to 11 th aspects, a thermal conductivity coefficient of a material constituting the soaking portion is higher than a thermal conductivity coefficient of a material constituting the cylindrical portion in the axial direction, and a resistivity of the material constituting the soaking portion is higher than a resistivity of the material constituting the cylindrical portion in a circumferential direction of the roller unit.

The induction heating roller is heated by joule heat mainly by flowing an eddy current in the circumferential direction of the roller unit. If eddy current flows more easily in the heat equalizing portion than in the cylindrical portion in the circumferential direction, the following problem may occur. First, when the soaking section disposed at a position slightly separated from the cylindrical section to be heated generates heat, the heat may diffuse not only to the cylindrical section but also to other members and/or spaces. The heat thus diffused is not necessarily uniformly transferred to the cylindrical portion. Further, since the heat equalizing portion is generally shorter in the axial direction than the cylindrical portion, when the heat equalizing portion generates heat, the heat generation distribution in the axial direction becomes uneven with respect to the cylindrical portion. For these reasons, the temperature deviation of the cylindrical portion in the axial direction may become large. In the present invention, the soaking portion can easily transmit heat in the axial direction, and can suppress eddy current from flowing in the circumferential direction to the soaking portion, thereby suppressing unnecessary heat generation of the soaking portion itself. Therefore, it is possible to suppress the increase in temperature variation of the cylindrical portion due to heat generation of the soaking portion.

The spinning and drawing apparatus of claim 13 is provided with the induction heating roller of any one of claims 1 to 12, and is characterized in that a plurality of yarns are wound around the cylindrical portion so as to be aligned in the axial direction as a heating target.

In the present invention, the yarn is wound around the cylindrical portion in which the temperature variation in the axial direction is reduced. Therefore, quality variation between the plurality of yarns heated by the induction heating roller can be reduced.

Drawings

Fig. 1 is a schematic view showing a spinning and drawing machine including an induction heating roller according to the present embodiment.

Fig. 2 is a sectional view of the induction heating roller.

Fig. 3 is a table showing physical parameters of the roller main body, the soaking member, and the heat generating member.

Fig. 4 is a graph showing the temperature distribution of the outer peripheral surface in the axial direction.

Fig. 5 (a) and (b) are tables showing physical parameters of the roller main body, the soaking member, and the heat generating member according to the modification.

Fig. 6 (a) to (f) are explanatory views showing the arrangement of heat generating components according to another plurality of modifications.

Fig. 7 is a diagram showing an induction heating roller according to still another modification.

Description of the symbols

3: a spinning stretching device; 20: an induction heating roller; 30: a roller unit; 31: a roller body; 32: a soaking part (soaking part); 34: an outer cylinder portion (cylindrical portion); 34 b: an inner peripheral surface; 42: a pressing part; 52: a coil; 60: a heat generating component (heat generating portion); y: a wire (heating target).

Detailed Description

Next, embodiments of the present invention will be explained. The vertical direction on the paper surface in fig. 1 is referred to as the vertical direction (the vertical direction in which gravity acts). The left-right direction of the paper in fig. 1 is referred to as the left-right direction. The vertical direction of the paper surface in fig. 1 is the front-rear direction.

(spinning traction machine)

The configuration of the spinning and drawing machine 1 including the induction heating roller 20 according to the present embodiment will be described with reference to fig. 1. Fig. 1 is a schematic view of a spinning traction machine 1 viewed from the front side. The spinning and drawing machine 1 is configured to draw a plurality of yarns Y (heating target object of the present invention) spun from a spinning device 2 by a spinning and drawing device 3 and then wind the yarns Y by a yarn winding device 4.

The spinning device 2 continuously spins a molten polymer such as polyester to produce a plurality of yarns Y. The plurality of threads Y spun from the spinning device 2 are provided with finish by the finish guide 10. After that, the yarn Y is conveyed to the spinning and drawing device 3 via the guide roller 11.

The spinning and drawing apparatus 3 is an apparatus for drawing a plurality of yarns Y. The spinning stretching device 3 is disposed below the spinning device 2. The spinning and drawing device 3 has a plurality of godet rollers 21 to 25 housed in an insulating box 12. The godet rollers 21 to 25 are driven to rotate by motors, not shown, provided in correspondence with the godet rollers. The godet rollers 21 to 25 are induction heating rollers 20 (details will be described later) that are inductively heated by coils. A plurality of yarns Y are wound around the outer peripheral surfaces of the godet rollers 21 to 25. An inlet 12a for introducing the plurality of yarns Y into the heat insulating box 12 is formed in the lower portion of the right side surface portion of the heat insulating box 12. A lead-out port 12b for leading out the plurality of yarns Y to the outside of the heat insulating box 12 is formed in the upper portion of the right side surface portion of the heat insulating box 12. The plurality of yarns Y are wound and hung at a winding angle of less than 360 degrees with respect to each of the godet rollers 21 to 25 in order from the godet roller 21 on the lower side.

The lower 3 godet rollers 21 to 23 are preheating rollers for preheating before drawing the plurality of yarns Y. The surface temperature of the godet rollers 21 to 23 is set to a temperature (for example, 90 to 100 ℃) equal to or higher than the glass transition point of the yarn Y. The upper two godet rolls 24 and 25 are texturizing rolls for heat-setting the drawn yarns Y. The surface temperature of the godet rollers 24, 25 is set to a temperature (for example, 150 to 200 ℃) higher than the surface temperature of the godet rollers 21 to 23. The yarn feed speed of the godets 24 and 25 is set to be faster than the yarn feed speed of the godets 21 to 23.

The plurality of yarns Y introduced into the incubator 12 through the inlet 12a are preheated to a temperature at which the yarns Y can be stretched while being conveyed by the godet rollers 21 to 23. The plurality of preheated yarns Y are drawn by the difference in yarn feeding speed between the godet rollers 23 and 24. The plurality of threads Y are heated to a higher temperature during the transport by the godets 24, 25. Thereby, the plurality of filaments Y are heat-set in a state after being stretched. The plurality of yarns Y thus stretched are led out of the heat insulation box 12 through the lead-out port 12 b.

The plurality of yarns Y stretched by the spinning stretching device 3 are fed to the yarn winding device 4 via the guide roller 13. The yarn winding device 4 is a device that winds a plurality of yarns Y. The yarn winding device 4 is disposed below the spinning and drawing device 3. The yarn winding device 4 includes a bobbin holder 14, a touch roller 15, and the like. The bobbin holder 14 has a cylindrical shape extending in the front-rear direction. The bobbin holder 14 is rotationally driven by a motor not shown. A plurality of bobbins B are mounted on the bobbin holder 14 in a line in the front-rear direction. The yarn winding device 4 simultaneously winds a plurality of yarns Y around a plurality of bobbins B by rotating the bobbin holder 14, thereby producing a plurality of packages P. The contact roller 15 comes into contact with the surfaces of the plurality of packages P to apply a predetermined contact pressure, thereby adjusting the shape of the packages P.

(constitution of Induction heating roller)

Next, the structure of the induction heating roller 20 applied to the godet rollers 21 to 25 will be described with reference to the cross-sectional view of fig. 2 and the table of fig. 3. Fig. 2 is a sectional view of the induction heating roller 20 passing through the axial center of the induction heating roller 20. As shown in fig. 2, a roller unit 30 (described later) of the induction heating roller 20 is cantilever-supported by a motor 100 that rotates the driving roller unit 30. Hereinafter, a direction in which the roller unit 30 extends (a left-right direction of the paper of fig. 2) is referred to as an axial direction of the roller unit 30. Hereinafter, the axial direction of the roller unit 30 is also simply referred to as the axial direction. The motor 100 side (right side of the paper surface in fig. 2) is a base end side (the other side of the present invention) in the axial direction. The side opposite to the motor 100 (left side in fig. 2) in the axial direction is referred to as a leading end side (side of the present invention). The radial direction of the roller unit 30 (vertical direction on the paper surface in fig. 2) is also simply referred to as the radial direction. The circumferential direction (the direction perpendicular to both the axial direction and the radial direction) of the roller unit 30 is also simply referred to as the circumferential direction.

As shown in fig. 2, the induction heating roller 20 includes a rotatable roller unit 30 and a non-rotatable fixing portion 50. The induction heating roller 20 is configured to increase the temperature of the outer peripheral surface of the roller unit 30 (the outer peripheral surface 31a of the roller main body 31 described later) by induction heating using a coil 52 described later provided in the fixing portion 50. Thereby, the induction heating roller 20 heats the plurality of yarns Y wound around the outer peripheral surface 31 a. The roller unit 30 is rotationally driven by a motor 100. The fixing portion 50 is fixed to a support portion, not shown, attached to the motor 100, for example.

The roller unit 30 includes a roller main body 31 and a soaking member 32 (soaking portion of the present invention). The roller body 31 is a substantially cylindrical member. The roller main body 31 is rotationally driven by a motor 100. The soaking member 32 is configured to uniformize the temperature of the roller body 31 in the axial direction. The roller main body 31 and the soaking member 32 are fixed to each other via a fixing ring 33 or the like provided at the axial base end portion of the roller unit 30.

The roller body 31 is formed of, for example, a carbon steel that is a magnetic body (ferromagnetic body) and is a conductor. The carbon steel has a relative magnetic permeability of 100 to 2000 (see FIG. 3). The roller body 31 has an outer tube portion 34 (a cylindrical portion of the present invention), an axial center portion 35, and a disc portion 36. The outer tube portion 34 is a substantially cylindrical portion of the roller main body 31 disposed on the outermost side in the radial direction. The outer tube portion 34 is configured to extend in the axial direction. The axial direction, the radial direction, and the circumferential direction of the outer tube portion 34 substantially coincide with the axial direction, the radial direction, and the circumferential direction of the roller unit 30, respectively. The axial center portion 35 is a substantially cylindrical portion disposed radially inward of the coil 52. The disc portion 36 is a substantially disc-shaped portion that connects the front end of the outer tube portion 34 and the front end of the shaft center portion 35. In other words, the circular plate portion 36 is a portion extending radially inward from the axial distal end portion of the outer cylinder portion 34. The roller main body 31 is open toward the axial base end side.

In the present embodiment, the outer cylinder portion 34, the axial center portion 35, and the disc portion 36 are integrally formed as one member. However, the present invention is not limited thereto. For example, the outer tube portion 34 may be formed of a single 1 st member, and the shaft center portion 35 and the disc portion 36 may be formed of a single 2 nd member (not shown). In this case, the 1 st member and the 2 nd member are fixed to each other by, for example, welding, a fixing method using a fixing member such as a screw, or the like.

A coating layer (not shown) having a thickness of, for example, about 0.05mm is formed radially outward of the outer peripheral surface 34a of the outer tube portion 34. The surface of the coating layer is the outer peripheral surface 31a (roller surface) of the roller main body 31. A plurality of yarns Y are wound around the outer circumferential surface 31a in an axially aligned manner as a heating target (in other words, a plurality of yarns Y are wound around the outer tube 34). Further, a coating layer is not necessarily provided (in this case, the outer peripheral surface 34a of the outer cylinder 34 is the outer peripheral surface of the roller main body 31). The length of the outer peripheral surface 31a in the axial direction is, for example, 150 mm. The soaking member 32 is in contact with the inner peripheral surface 34b of the outer tube portion 34. The shaft center portion 35 is formed with a shaft mounting hole 35a through which the drive shaft 101 of the motor 100 is inserted. The drive shaft 101 is fitted into the shaft mounting hole 35 a. Thereby, the roller body 31 is fixed to the drive shaft 101 and can rotate integrally with the drive shaft 101. The roller body 31 is cantilevered by a drive shaft 101. The heat generating member 60 (described later) is in contact with a surface (base end surface 36a) of the disc portion 36 on the axial base end side. Further, a substantially disc-shaped heat insulator (not shown) is attached to the axial distal end side of the surface (distal end surface 36b) of the disc portion 36 on the axial distal end side. The heat insulating member is exposed to the outside air (air in the incubator 12).

The soaking member 32 is a member for making the distribution of the surface temperature of the roller main body 31 (i.e., the temperature of the outer peripheral surface 31a) uniform in the axial direction by moving heat in the axial direction. The axial direction, the radial direction, and the circumferential direction of the soaking member 32 substantially coincide with those of the roller unit 30, respectively. The soaking member 32 is disposed radially inward of the outer tube portion 34. The soaking member 32 is disposed radially outward of the coil 52. The heat equalizing member 32 is pressed toward the axial distal end side by the pressing portion 42 (details will be described later). Thereby, the soaking member 32 and a heat generating member 60 described later are fixed to the roller body 31.

The soaking member 32 is a cylindrical member extending in the axial direction. The soaking member 32 is formed of, for example, a C/C composite material (carbon fiber reinforced carbon composite material) which is a composite material of carbon fibers and graphite. The C/C composite material is a non-magnetic material. In the present embodiment, the carbon fibers of the C/C composite material are oriented in the axial direction. In other words, in the present embodiment, as described later, the material constituting the soaking member 32 is a material having anisotropy with respect to the thermal conductivity and the resistivity. The thermal conductivity of the C/C composite material in the axial direction is higher than the thermal conductivity of the material constituting the roller body 31 (at least higher than the thermal conductivity of the inner circumferential surface 34b of the outer cylindrical portion 34). In other words, the soaking member 32 moves heat more easily than the outer cylinder 34 in the axial direction. For example, the carbon steel constituting the roller main body 31 has a thermal conductivity of 51.5W/(m · K) (see fig. 3). On the other hand, the thermal conductivity coefficient in the axial direction of the C/C composite material constituting the soaking member 32 is 404W/(m · K) (see fig. 3). The heat conduction coefficient in the axial direction of the material constituting the soaking member 32 is higher than the heat conduction coefficient in the circumferential direction of the material constituting the soaking member 32 (15.2W/(m · K). refer to fig. 3). The soaking member 32 makes the temperature of the outer peripheral surface 31a of the roller main body 31 uniform by moving heat in the axial direction by heat conduction. In addition, the carbon fibers of the C/C composite material are not necessarily oriented in the axial direction. For example, the soaking part 32 may also be formed by a C/C composite material in which carbon fibers are randomly oriented.

The heat equalizing member 32 is divided into a plurality of heat equalizing pieces 41 in the circumferential direction. The radially outer surface (outer surface 41a) of each heat equalizing sheet 41 is in contact with the inner circumferential surface 34b of the outer cylindrical portion 34. When the region in the axial direction in which the plurality of yarns Y are wound in the outer peripheral surface 31a of the roller main body 31 is defined as the winding region R, the soaking sheets 41 are provided over substantially the same range as the winding region R in the axial direction. The radially inner surface (inner surface 41b) of each heat equalizing sheet 41 faces the coil 52 in the radial direction. The surface (base end surface 41c) of each heat equalizing sheet 41 on the axial base end side is a tapered surface. Specifically, the base end surface 41c protrudes toward the axial base end side as it goes radially outward. A gap is formed in the axial direction between the surface (the distal end surface 41d) on the axial distal end side of each soaking piece 41 and the base end surface 36a of the disk portion 36. A heat generating member 60 described later is disposed in the gap.

Each heat equalizing piece 41 is pressed toward the axial distal end side and the radial outer side by the pressing portion 42. The pressing portion 42 has a pressing member 43 and a plurality of springs 44. The pressing member 43 is, for example, a substantially annular member made of carbon steel, similar to the roller body 31. The outer peripheral surface of the pressing member 43 is disposed at substantially the same position as the outer surface 41a of the soaking sheet 41 in the radial direction, for example. The inner peripheral surface of the pressing member 43 is disposed radially inward of the inner surface 41b of the soaking sheet 41, for example. A surface (distal end surface 43a) on the axial distal end side of the pressing member 43 is a tapered pressing surface. Specifically, the distal end surface 43a projects toward the axial distal end side as it goes radially inward. Thereby, the distal end surface 43a and the base end surface 41c of the heat equalizing sheet 41 are firmly in contact with each other.

The spring 44 is disposed between the pressing member 43 and the fixed ring 33 in the axial direction. The base end portion of the spring 44 is in contact with the fixed ring 33. The front end of the spring 44 contacts the pressing member 43. The spring 44 is compressed in the axial direction by the fixed ring 33 and the pressing member 43. Thereby, the spring 44 urges the pressing member 43 toward the axial distal end side by the elastic restoring force. The pressing member 43 is urged by a spring 44, and the soaking member 32 is thereby pressed toward the axial distal end side. At this time, each heat equalizing sheet 41 of the heat equalizing member 32 is also pressed radially outward by the tapered distal end surface 43a of the pressing member 43. Thereby, each soaking piece 41 is firmly pressed against the outer tube portion 34. Therefore, even when a difference occurs between the thermal expansion amount of the outer tube portion 34 and the thermal expansion amount of the heat equalizing member 32, it is possible to prevent a gap from being formed between the outer tube portion 34 and the heat equalizing member 32. In addition, the number of the springs 44 is not limited. As the urging member for urging the pressing member 43, for example, an elastic member made of rubber may be used instead of the spring 44.

The fixing ring 33 is, for example, a substantially annular member made of carbon steel similar to the roller body 31. The fixing ring 33 is fixed to the axial base end portion of the outer cylinder 34 of the roller body 31 by, for example, a screw not shown. The fixed ring 33 is provided to compress a spring 44 disposed between the fixed ring 33 and the pressing member 43 in the axial direction. Thereby, as described above, the roller body 31 and the soaking member 32 are fixed to each other via the fixing ring 33 and the like.

Next, the fixing portion 50 will be explained. As shown in fig. 2, the fixing portion 50 includes a bobbin member 51, a coil 52, and a flange 53. In the fixing portion 50, a coil 52 is wound in the axial direction around a bobbin member 51 extending in the axial direction. The axial base end of the spool member 51 is attached to the flange 53.

The bobbin member 51 is, for example, a substantially cylindrical member formed of carbon steel as in the roller body 31. The bobbin member 51 extends in the axial direction of the roller unit 30. The circumferential direction of the bobbin member 51 substantially coincides with the circumferential direction of the roller unit 30. The bobbin member 51 is disposed radially inward of the outer cylinder 34 of the roller body 31. The bobbin member 51 is disposed radially outward of the axial center portion 35 of the roller body 31. A coil 52 is wound around the outer periphery of the bobbin member 51 in the axial direction.

The coil 52 is used at least for induction heating of the outer tube portion 34 and a heat generating component 60 (a heat generating portion of the present invention) described later. The coil 52 is wound around the outer periphery of the bobbin member 51. The coil 52 wound around the outer periphery of the bobbin member 51 extends along the extending direction of the bobbin member 51 (see fig. 2). In other words, the longitudinal direction in which the coil 52 extends substantially coincides with the axial direction of the roller unit 30. The coil 52 is disposed radially inward of the outer cylinder 34 of the roller body 31. The coil 52 is disposed radially outward of the axial center portion 35 of the roller body 31. For example, when an ac voltage is applied to the coil 52 by an ac power supply not shown, an ac current flows through the coil 52 to generate an ac magnetic field. The ac power supply is, for example, a general commercial power supply (power supply frequency is 50Hz or 60Hz), but is not limited thereto.

The flange 53 is, for example, a substantially disk-shaped member formed of carbon steel as in the roller main body 31. The flange 53 is disposed at the axial base end of the fixing portion 50. A through hole 53a is formed in a radially central portion of the flange 53 so that the flange 53 and the drive shaft 101 of the motor 100 do not interfere with each other. An axial base end portion of the bobbin member 51 is attached to the flange 53. The flange 53 is fixed to a support portion, not shown, provided in the motor 100. The flange 53 is arranged in the axial direction with the fixed ring 33, for example. The flange 53 and the fixing ring 33 are disposed apart from each other.

In the induction heating roller 20 having the above configuration, when an ac voltage is applied to the coil 52, an ac current flows through the coil 52 to generate an ac magnetic field. Thereby, the magnetic flux passes through the outer cylindrical portion 34 of the roller body 31 in the axial direction (see an arrow a of a two-dot chain line in fig. 2). At this time, an eddy current flows in the roller body 31 in the circumferential direction, and the outer cylinder 34 generates heat by joule heat.

Here, in general, in the induction heating roller 20, it is difficult for the magnetic flux to uniformly flow in the axial direction due to leakage of the magnetic flux, and it is difficult for the heat generation of the outer cylindrical portion 34 to be uniform in the axial direction. More specifically, the magnetic flux passing through the axial end portions of the outer tube portion 34 is smaller than the magnetic flux passing through the axial center portion, and therefore the axial end portions (both end portions) are less likely to generate heat. At the axial distal end portion of the roller unit 30, the heat is easily released to the outside via the circular plate portion 36 (although the heat radiation can be suppressed by the heat insulator, it is difficult to completely prevent the heat radiation). Therefore, the axial distal end portion of the outer cylinder 34 is easily cooled by heat radiation. As described above, since heat generation and heat dissipation are difficult, the temperature of the axial distal end portion of the outer peripheral surface 31a tends to be lower than the temperature of the axial central portion, and the temperature of the outer peripheral surface 31a tends to vary in the axial direction.

In the present embodiment, the heat generated in the outer tube portion 34 is easily conducted (easily moved) in the axial direction by the soaking member 32, and thus the temperature variation in the axial direction of the outer peripheral surface 31a is reduced as compared with the case where the soaking member 32 is not provided. However, the present inventors have found that there is still room for further improvement in such a structure. Therefore, in order to effectively reduce the temperature variation of the outer peripheral surface 31a (roller surface) in the axial direction, the roller unit 30 of the present embodiment has the following configuration.

(detailed construction of roller Unit)

Next, the detailed structure of the roller unit 30 will be described with reference to fig. 2 and 3. As shown in fig. 2, the roller unit 30 further includes a heat generating member 60 disposed on the axial direction front end side of the soaking member 32. The heat generating member 60 is configured to heat the distal end portion of the outer tube portion 34 and the vicinity thereof by being inductively heated. In the present embodiment, the heat generating member 60 is provided as a member different from the roller main body 31 and the soaking member 32.

The heat generating member 60 is an annular conductive member. The ring shape is formed over the entire heat generating component 60 in the circumferential direction. For example, the heat generating member 60 may have an annular shape or a polygonal shape. Alternatively, the heat generating member 60 may be divided into a plurality of conductive annular pieces (not shown) in the circumferential direction, and two annular pieces adjacent in the circumferential direction may be in contact with each other. The circumferential direction of the heat generating component 60 substantially coincides with the circumferential direction of the outer tube portion 34. The heat generating component 60 has, for example, a substantially rectangular cross section (see fig. 2). That is, the heat generating member 60 has, for example, an outer peripheral surface 60a disposed on the radially outer side, an inner peripheral surface 60b disposed on the radially inner side, a base end surface 60c disposed on the axial base end side, and a tip end surface 60d disposed on the axial tip end side.

The material constituting the heat generating component 60 is preferably aluminum. That is, the resistivity of the material constituting the heat generating member 60 is lower than the resistivity of the material constituting the roller main body 31 and the resistivity of the material constituting the soaking member 32 at least in the circumferential direction. Specifically, the resistivity of aluminum, which is a material constituting the heat generating member 60, is 3.0 μ Ω · cm (see fig. 3). The resistivity of the carbon steel, which is the material constituting the roller main body 31, was 11.8 μ Ω · cm (see fig. 3). The resistivity in the circumferential direction of the C/C composite material, which is the material constituting the soaking member 32, is higher than the resistivity of the material constituting the roller main body 31 (outer cylindrical portion 34) and is 1.3 × 10⁶μ Ω · cm (see fig. 3). The resistivity of the material constituting the soaking member 32 in the circumferential direction is higher than the resistivity of the material constituting the soaking member 32 in the axial direction (3.9 × 10)⁴μ Ω · cm. See fig. 3) high. Further, the heat generating member 60 is preferably formed of a non-magnetic material (a material other than a ferromagnetic material) so as not to hinder the passage of magnetic flux in the roller main body 31. Aluminum is a nonmagnetic material (aluminum has a relative permeability of 1.0), and therefore satisfies the above condition. In order to avoid an increase in weight of the roller unit 30 as much as possible, the density of the material constituting the heat generating member 60 is preferably low. For this purpose, the density of the aluminium is 2.7g/cm³(refer to fig. 3). Further, the density of the carbon steel was 7.8g/cm³(refer to fig. 3). Furthermore, the density of the C/C composite material was 1.7g/cm³(refer to fig. 3). Therefore, in the present embodiment, the density of the heat generating component 60 (the density of the material constituting the heat generating component 60) is lower than at least the density of the roller main body 31 (the density of the material constituting the roller main body 31).

When the heat generating member 60 is made of aluminum as in the present embodiment, the preferred thickness of the heat generating member 60 in the axial direction is, for example, 2 mm. However, the thickness is not limited to the above.

The arrangement of the heat generating component 60 will be explained. The heat generating member 60 is disposed at a position of an end portion on the front end side of the outer tube portion 34 in the axial direction. In the present embodiment, the "position of the end portion on the distal end side of the outer cylinder portion 34" is a position between the proximal end surface 36a of the circular plate portion 36 and the distal end of the soaking member 32 (the distal end surface 41d of the soaking sheet 41) in the axial direction. The heat generating member 60 is disposed radially inward of the outer cylinder portion 34 and on the axial base end side of the disk portion 36. The heat generating member 60 is disposed on the axial front end side of the soaking member 32. The heat generating member 60 and the soaking member 32 are arranged adjacent to each other in the axial direction. The base end surface 60c of the heat generating member 60 is in contact with the front end surface 41d of the soaking member 32. Thus, the heat generating member 60 and the soaking member 32 can conduct heat mutually without passing through other members such as the roller main body 31. In other words, the heat generating component 60 can directly conduct heat with the soaking component 32.

The front end surface 60d of the heat generating member 60 is in contact with the base end surface 36a of the circular plate portion 36. On the other hand, the heat generating member 60 is disposed apart from the outer cylindrical portion 34 in the radial direction. That is, the outer peripheral surface 60a of the heat generating component 60 is separated from the inner peripheral surface 34b of the outer tube portion 34. The inner circumferential surface 60b of the heat generating member 60 is disposed substantially flush with the inner surface 41b of each soaking sheet 41, but is not limited thereto. In the present embodiment, at least a part of the heat generating component 60 is disposed at a position overlapping the winding region R in the axial direction, but the present invention is not limited to this.

The heat generating component 60 is pressed toward the axial distal end side together with the soaking component 32 by the pressing member 43 and the spring 44. Thereby, the heat generating member 60 is axially sandwiched and fixed between the soaking member 32 and the circular plate portion 36 of the roller body 31.

(mechanism of temperature deviation reduction)

In the induction heating roller 20 having the above configuration, the temperature of the outer peripheral surface 31a is made uniform as follows. That is, most of the magnetic flux generated by the current flowing through the coil 52 passes through the roller body 31 (see arrow a in fig. 2). On the other hand, a part of the magnetic flux leaks from the roller main body 31 and passes through the heat generating component 60. An induced electromotive force is generated in the circumferential direction of the heat generating component 60 inside the heat generating component 60 by a component of the part of the magnetic flux passing through the heat generating component 60 in the axial direction. The induced electromotive force causes an eddy current to flow in the circumferential direction of the heat generating component 60, and the heat generating component 60 generates heat by joule heat. As described above, the heat generating member 60 is made of a material having a lower resistivity than the material of the roller body 31. Therefore, a large eddy current easily flows in the heat generating member 60, and the heat generating member 60 generates much heat. In this way, the heat generating member 60 is inductively heated, whereby the amount of heat generated near the axial end portion of the outer cylindrical portion 34 increases. This makes it easy to increase the temperature near the axial end of the outer cylinder 34.

Further, in the present embodiment, the heat generated in the heat generating member 60 is directly conducted to the soaking member 32 in contact with the heat generating member 60. Therefore, the heat generated in the heat generating member 60 can be substantially uniformly transferred to the outer cylinder portion 34 in the axial direction and further to the outer peripheral surface 31a of the roller main body 31 by the heat equalizing member 32. This can suppress an abnormal increase in temperature only at the axial end of the outer peripheral surface 31 a. Further, the heat generated in the heat generating member 60 is not directly conducted to the outer cylindrical portion 34, but is indirectly conducted to the outer cylindrical portion 34 via the soaking member 32. Therefore, as compared with the case where the heat generated in the heat generating component 60 is directly conducted to the outer cylindrical portion 34, it is possible to more effectively suppress the temperature of only the axial end portion of the outer peripheral surface 31a from becoming abnormally high. By the above mechanism, the temperature variation of the outer circumferential surface 31a in the axial direction is reduced.

(confirmation result of temperature deviation reducing Effect)

Next, the result of checking the effect of reducing the temperature deviation of the heat generating component 60 will be specifically described with reference to the graph of fig. 4. The present inventors measured and compared the temperature distribution in the axial direction of the outer peripheral surface 31a of the roller main body 31 between the case where the heat generating component 60 is provided in the roller unit 30 (example) and the case where it is not provided (comparative example). As a common condition, the set temperature of the outer peripheral surface 31a is set to 200 ℃.

Fig. 4 shows the comparison result. The horizontal axis of the graph indicates the distance of the outer peripheral surface 31a from the front end of the roller body 31. That is, the smaller the distance, the closer the axial direction leading end of the roller main body 31 is, and the larger the distance, the closer the axial direction base end of the roller main body 31 is. As described above, the length of the outer peripheral surface 31a in the axial direction is 150 mm. The winding region R of the winding yarn Y is, for example, a region of 16 to 140mm from the axial tip of the roller body 31 to the axial base end side. The ordinate of the graph shows the difference between the temperature of the outer peripheral surface 31a and the set temperature (200 ℃). In the comparative example (see the non-black circular mark in fig. 4), the temperature of the portion of the outer peripheral surface 31a farther from the central portion in the axial direction is greatly reduced. In particular, at the axial leading end of the winding region R (a position 16mm from the leading end of the roller body 31 toward the axial base end side), the temperature of the outer peripheral surface 31a is lower than the set temperature by about 5 ℃. On the other hand, in the example (see the black circular mark of fig. 4), the difference between the temperature of the axial direction tip portion of the winding region R and the set temperature was reduced to about 1.5 ℃. Thus, the following was confirmed: in the induction heating roller 20, the temperature variation of the outer peripheral surface 31a in the axial direction is reduced by the soaking member 32 and the heat generating member 60.

As described above, the heat generating member 60 having a low resistivity is inductively heated, whereby the amount of heat generated in the vicinity of the axial end portion of the outer cylinder portion 34 can be increased. This can easily increase the temperature near the axial end of the outer tube 34. Also, the heat generated in the heat generating component 60 is directly conducted to the soaking component 32. Therefore, the heat can be substantially uniformly transferred to the outer cylinder portion 34 in the axial direction and further to the outer peripheral surface 31a of the roller body 31 by the soaking member 32. This can suppress an abnormal increase in temperature only at the axial end of the outer peripheral surface 31a of the roller body 31. As described above, in the induction heating roller 20, the temperature variation of the outer tube portion 34 in the axial direction can be effectively reduced, and the temperature variation of the outer peripheral surface 31a can be effectively reduced.

The annular heat generating member 60, which can be easily and inexpensively manufactured, is provided as a member different from the roller body 31 and the soaking member 32. Therefore, as compared with the case where the heat generating member 60 is integrally formed with the roller body 31 or the soaking member 32, the increase in the time and cost for manufacturing can be suppressed.

As the heat equalizing portion for axially moving heat, only the heat equalizing member 32 having a high heat conductivity is provided. Therefore, the structure of the roller unit 30 can be simplified as compared with a configuration in which, for example, a jacket chamber (described later) is provided as the soaking portion.

In the present embodiment, the heat equalizing member 32 is disposed radially inward of the outer tube portion 34, and the heat generating member 60 is axially adjacent to the heat equalizing member 32. Therefore, for example, the heat generating component 60 is arranged in the vicinity of the outer tube portion 34 in the radial direction, compared to a case where the heat generating component 60 is arranged radially inward of the soaking component 32. Therefore, deterioration of the heating efficiency of the outer tube portion 34 can be suppressed.

In the present embodiment, the heat generated in the heat generating member 60 can be directly transferred to the soaking member 32. Therefore, it is possible to suppress the temperature of only the axial end portion of the outer peripheral surface 31a from becoming abnormally high. Therefore, the temperature of the outer cylinder 34 can be efficiently equalized in the axial direction, and the temperature variation of the outer peripheral surface 31a of the roller body 31 can be reduced.

In the present embodiment, the heat generated in the heat generating member 60 is not directly transferred to the outer cylindrical portion 34, but is indirectly transferred to the outer cylindrical portion 34 via the heat equalizing member 32. Therefore, compared to the case where the heat generated by the heat generating component 60 is directly transferred to the outer cylinder portion 34, it is possible to more reliably suppress the temperature of only the axial end portion of the outer cylinder portion 34 from becoming abnormally high.

In the present embodiment, in the configuration in which the roller body 31, the heat equalizing member 32, and the heat generating member 60 are provided as separate members, both the heat equalizing member 32 and the heat generating member 60 can be pressed toward the axial tip side (the circular plate portion 36 side) by one pressing portion 42. Thereby, the soaking member 32 and the heat generating member 60 can be fixed to the roller body 31 by being sandwiched between the pressing portion 42 and the disk portion 36 in the axial direction. Therefore, the heat generating member 60 can be fixed to the roller body 31 with a simple configuration, as compared with a case where the heat generating member 60 and the soaking member 32 are arranged at different positions in the radial direction.

In the induction heating roller 20 in which the roller main body 31 is supported in a cantilever manner as in the present embodiment, the axial end surface (the distal end surface 36b) of the roller main body 31 is exposed to the outside air. Therefore, there is a problem that heat is radiated from the axial front end portion of the roller body 31 to a large extent and the temperature of the axial front end portion of the outer cylinder 34 is particularly likely to be lowered. In this regard, in the present embodiment, the heat generating member 60 heats the vicinity of the axial distal end portion of the outer tube portion 34, and therefore, a decrease in temperature of the axial distal end portion of the outer tube portion 34 can be effectively suppressed. Therefore, the temperature variation of the outer tube portion 34 can be effectively reduced, and the temperature variation of the outer peripheral surface 31a of the roller main body 31 can be reduced.

Further, the heat generating component 60 is made of a non-magnetic material. Therefore, a situation in which the flow pattern of the magnetic flux is different from the originally desired flow pattern can be avoided.

Further, the density of the heat generating component 60 (i.e., the density of aluminum, which is a material constituting the heat generating component 60) is lower than at least the density of the outer cylinder portion 34 (i.e., the density of carbon steel, which is a material constituting the outer cylinder portion 34). Therefore, the increase in weight of the induction heating roller 20 due to the provision of the heat generating member 60 can be suppressed.

Further, when an eddy current is likely to flow in the soaking member 32 in the circumferential direction as compared with the outer tube portion 34, the following problem may occur. First, when the soaking member 32 disposed at a position slightly separated from the outer tube portion 34 as the temperature raising target generates heat, the heat may be diffused not only toward the outer tube portion 34 but also toward other members and/or spaces. The heat thus diffused is not necessarily uniformly transferred toward the outer cylindrical portion 34. Further, the heat equalizing member 32 is shorter than the outer cylindrical portion 34 in the axial direction, so when the heat equalizing member 32 generates heat, the heat generation distribution in the axial direction becomes uneven with respect to the outer cylindrical portion 34. For these reasons, the temperature deviation of the outer tube portion 34 in the axial direction may become large. In the present embodiment, the heat-conducting coefficient of the material constituting the soaking member 32 is higher than the heat-conducting coefficient of the material constituting the outer tube portion 34 in the axial direction. Further, the material constituting the soaking member 32 has a higher resistivity than the material constituting the outer tube portion 34 in the circumferential direction. Therefore, the heat can be easily transmitted in the axial direction by the heat equalizing member 32, and the eddy current can be suppressed from flowing in the circumferential direction to the heat equalizing member 32, and the unnecessary heat generation of the heat equalizing member 32 itself can be suppressed. Therefore, it is possible to suppress the increase in the temperature deviation of the outer cylinder portion 34 due to the heat generation of the soaking member 32.

In the spinning and drawing apparatus 3 of the present embodiment, the yarn Y is wound around the outer cylinder 34 in which the temperature variation in the axial direction is reduced. Therefore, quality variation among the plurality of yarns Y heated by the induction heating roller 20 can be reduced.

Next, a modification of the above embodiment will be described. However, the same reference numerals are given to the same components as those of the above-described embodiment, and the description thereof will be omitted as appropriate.

(1) In the above embodiment, the soaking member 32 is made of a C/C composite material in which carbon fibers are oriented in the axial direction, and the heat generating member 60 is made of aluminum, but the present invention is not limited thereto. The material constituting the soaking member 32 has anisotropy with respect to the thermal conductivity and the electrical resistivity (i.e., the thermal conductivity is different from each other in the axial direction and the circumferential direction, and the electrical resistivity is different from each other in the axial direction and the circumferential direction), but is not limited thereto. As an example, as shown in fig. 5 (a), the soaking member 32 may be formed of a C/C composite material in which carbon fibers are randomly oriented. The heat generating member 60 may be made of zinc. Specifically, the resistivity of the randomly oriented C/C composite was 1.3X 10³μ Ω · cm. The resistivity of zinc was 6.0. mu. omega. cm. In the present configuration, the density of zinc constituting the heat generating member 60 is 7.1g/cm³And is also lower than the density of the carbon steel constituting the roller main body 31 (7.8 g/cm)³) Low.

(2) In the embodiments described above, the density of the material constituting the heat generating member 60 is lower than the density of the material constituting the roller main body 31, but the present invention is not limited to this. As an example, as shown in fig. 5 (b), the soaking member 32 may be made of aluminum (metal material), and the heat generating member 60 may be made of copper having a resistivity (1.9 μ Ω · cm) lower than that (3.0 μ Ω · cm) of aluminum. In this case, the density of copper constituting the heat generating member 60 was 8.9g/cm³Density (7.8 g/cm) of carbon steel constituting the roller main body 31³) High. Further, as described above, the soaking member 32 is not necessarily made of the C/C composite material. It is sufficient that the heat conduction coefficient in the axial direction of the material constituting at least the soaking member 32 is higher than the heat conduction coefficient in the axial direction of the material constituting the roller main body 31. Specifically, the thermal conductivity of aluminum is 222W/(m.K), which is higher than that of carbon steel (51.5W/(m.K)). In the case where the heat equalizing member 32 is made of a metal material, the heat equalizing member 32 is not necessarily divided into a plurality of heat equalizing pieces 41 (the heat equalizing member 32 may be made of, for example, one substantially cylindrical member).

The combination of the materials constituting the roller main body 31, the soaking member 32, and the heat generating member 60 is not limited to the above combination. The heat generating member 60 may be made of at least a material having a lower resistivity than the material of the roller body 31 and the material of the soaking member 32. For example, the heat generating component 60 may be made of brass, gold, or silver. In the configuration in which the heat generating member 60 is divided into a plurality of ring pieces, the plurality of ring pieces are not necessarily made of the same kind of material. That is, the plurality of ring pieces may be made of different materials. In addition, the material constituting the soaking member 32 does not necessarily have a higher resistivity than the material constituting the roller main body 31 (outer cylindrical portion 34) in the circumferential direction.

(3) In the embodiments described above, the heat generating member 60 is made of a nonmagnetic material, but is not limited thereto. Even when the heat generating member 60 is made of a ferromagnetic material, the axial distal end portion of the outer tube portion 34 can be heated by the heat generating member 60 while suppressing difficulty in passing magnetic flux through the axial distal end portion of the outer tube portion 34 by examining the size and arrangement of the heat generating member 60.

(4) The roller body 31 may be made of a ferromagnetic material (cobalt, nickel, or the like) other than carbon steel. Alternatively, the roller main body 31 is not necessarily made of a ferromagnetic material.

(5) In the embodiments described above, the heat generating member 60 and the like are in contact with the base end surface 36a of the circular plate portion 36, but the present invention is not limited thereto. For example, a spacer not shown may be provided between the heat generating component 60 and the disk portion 36 in the axial direction.

(6) In the above embodiments, the heat generating member 60 is disposed apart from the outer cylindrical portion 34 in the radial direction, but the present invention is not limited to this. For example, as shown in fig. 6 (a), the outer peripheral surface 61a of the heat generating member 61 may be in contact with the inner peripheral surface 34b of the outer cylindrical portion 34. This allows the heat generating member 61 and the outer cylinder 34 to directly conduct heat. In the manufacturing process, when the heat generating member 61 is assembled to the roller body 31, the roller body 31 is heated in advance and expanded to realize such a configuration (shrink fit). In this configuration, the outer tube portion 34 can be efficiently heated by the heat generated in the heat generating member 61. Therefore, this configuration is effective when the amount of heat generated in the heat generating component 61 is small. In this configuration, the heat generating member 61 does not necessarily contact the soaking member 32. That is, the heat generating member 61 is not necessarily directly thermally conductive to the soaking member 32. Specifically, as shown in fig. 6 (b), the ring member 62 may be provided between the heat generating member 61 and the soaking member 32 in the axial direction. The material constituting the ring member 62 may have a lower thermal conductivity than the material constituting the roller body 31, for example. In this case, the heat generated in the heat generating member 61 is first transferred to the outer tube portion 34, and then is also transferred to the soaking member 32 via the outer tube portion 34.

(7) In the embodiments described above, the inner peripheral surface 60b of the heat generating member 60 is disposed substantially flush with the inner surface 41b of each soaking sheet 41, but the present invention is not limited thereto. For example, as shown in fig. 6 (c), the inner surface 63b of the heat generating component 63 may be arranged radially outward of the inner surface 41b of each soaking sheet 41. Alternatively, as shown in fig. 6 (d), the inner surface 64b of the heat generating component 64 may be disposed radially inward of the inner surface 41 b.

Alternatively, as shown in fig. 6 (e), the heat generating component 65 having an L-shaped cross section may be disposed in contact with both the front end surface 41d and the inner surface 41b of each soaking sheet 41. In this case, the "position of the end portion on the distal end side of the outer cylinder portion 34" is, for example, a position within 15mm from the distal end surface 36b of the disk portion 36 toward the axial proximal end side. That is, the heat generating member 65 is disposed so as to converge in the axial direction within a region of 15mm from the distal end face 36b toward the proximal end side. Further, the region is more preferably a region that does not overlap with the winding region R (see fig. 2) in the axial direction. In this case, the configuration of the portion of the roller unit 30 that constitutes the hanging region R can be made substantially uniform in the axial direction.

(8) In the embodiments described above, the heat generating member 60 and the like are arranged in the axial direction with respect to the soaking member 32, but the present invention is not limited to this. For example, as shown in fig. 6 (f), the heat generating member 66 may be disposed radially inward of the soaking sheet 41 and in contact with the inner surface 41 b. In this case, the heat generating member 66 may be fixed to the circular plate portion 36 of the roller body 31 by screws, not shown, for example. In this case, the "position of the end portion on the distal end side of the outer tube portion 34" is also defined as in the modification (7) above.

(9) In the embodiments described above, the coil 52 is disposed radially inward of the outer tube portion 34, but the present invention is not limited to this. Instead of the coil 52, a coil, not shown, may be disposed radially outward of the outer tube portion 34. In this case, the heat generating member 60 may be disposed adjacent to the outer tube portion 34 in the radial direction. In this case, at least a part of the heat generating component 60 in the axial direction may be disposed on the axial front end side of the base end surface 36a of the circular plate portion 36.

(10) In the embodiments described above, the heat generating member 60 and the like are disposed at the position of the end portion on the distal end side of the outer tube portion 34 in the axial direction, but the present invention is not limited to this. The heat generating member 60 and the like may be disposed at a position of the proximal end side end portion of the outer tube portion 34 in the axial direction (for example, in a region within 10mm from the axial proximal end toward the axial distal end side of the outer tube portion 34). Further, the region is more preferably a region that does not overlap with the winding region R (see fig. 2) in the axial direction.

(11) In the embodiments described above, the roller main body 31 is supported by a cantilever, but the present invention is not limited to this. That is, the induction heating roller 20 may include a roller body (not shown) supported at both ends. Further, the same disk portions (not shown) as the disk portions 36 may be disposed at both axial end portions of the roller main body.

(12) In the embodiments described above, the soaking member 32 (soaking portion) is provided as a separate member from the roller main body 31 (i.e., separable from each other), but the present invention is not limited to this. Hereinafter, the following description will be specifically made with reference to fig. 7. As shown in fig. 7, in the induction heating roller 20A, the roller main body 71 of the roller unit 70 has an outer tube portion 74 instead of the outer tube portion 34. Further, the roller unit 70 has a soaking section 72 formed in the roller main body 71. The heat equalizing portion 72 is disposed radially between the outer circumferential surface 74a and the inner circumferential surface 74b of the outer tube portion 74. More specifically, the soaking section 72 has an envelope chamber 75 formed inside the outer tube 74. The envelope chamber 75 extends in the axial direction. A gas-liquid two-phase heat medium (not shown) is sealed in the jacket chamber 75. Such a soaking section 72 functions as a so-called heat pipe. In more detail, the gas in the envelope chamber 75 moves at a high speed in the axial direction, whereby the heat moves at a high speed in the axial direction. The heat equalizing portion 72 can move heat in the axial direction, thereby equalizing the temperature of the outer peripheral surface 71a of the roller main body 71. In this case, the heat generating member 67 may be in contact with the inner peripheral surface 74b of the outer tube portion 74. In this modification, the fixing ring 73 is provided instead of the fixing ring 33, but the fixing ring 73 is not necessarily a member different from the roller main body 71. The fixing ring 73 may be formed integrally with the roller main body 71.

(13) In the embodiments described above, the heat generating member 60 is provided as a member different from the roller main body 31 and the soaking member 32, for example, but the present invention is not limited to this. For example, a ring portion (not shown) having a lower resistivity than the outer cylinder portion 34 and functioning as a heat generating portion that is inductively heated may be pressure-welded (welded) to the axial direction distal end portion of the outer cylinder portion 34. Thus, the ring portion may be formed integrally with the outer cylinder portion 34. In this configuration, the ring portion pressure-welded to the outer cylinder portion 34 is also disposed adjacent to the outer cylinder portion 34. This allows the ring portion and the outer cylinder portion 34 to conduct heat directly (i.e., without passing through other portions). The ring portion pressure-welded to the outer tube portion 34 may be in contact with the soaking member 32 or may be separated from the soaking member 32. Alternatively, such a ring portion may be pressure-welded to the soaking member 32. The ring portion pressure-welded to the soaking member 32 is disposed adjacent to the soaking member 32. This allows the ring portion and the soaking member 32 to directly conduct heat. The ring portion pressure-welded to the soaking member 32 may be in contact with the outer cylinder portion 34 or may be separated from the outer cylinder portion 34.

(14) The heat generating portion such as the heat generating member 60 may be provided in an induction heating roller (not shown) for heating an object to be heated other than the yarn Y (for example, toner for a printer).