阅读说明：本技术 纱线卷取机以及纱线卷取方法 (Yarn winding machine and yarn winding method ) 是由 播户志郎 于 2019-08-09 设计创作，主要内容包括：本发明涉及纱线卷取机以及纱线卷取方法,即便在精密卷取的执行中进行蠕动,也抑制卷绕比的变动且抑制卷装表面的形状紊乱。纱线卷取机具备：导纱器驱动部,往复驱动横动导纱器,在纱线的卷取动作中能够变更横动导纱器的反转位置；以及控制装置。控制装置能够执行：第1反转控制,在横动方向上,使以规定的速度向外侧行进的横动导纱器减速而在第1反转位置处向内侧反转,并再次加速至规定的速度；以及第2反转控制,在横动方向上,使以规定的速度向外侧行进的上述横动导纱器减速而在处于比第1反转位置靠内侧的第2反转位置处向内侧反转,并再次加速至规定的速度。控制装置在精密卷取的执行中,使第2反转控制中的第2反转时间(Trb)比第1反转控制中的第1反转时间(Tra)长。(The invention relates to a yarn winding machine and a yarn winding method, which can restrain the change of winding ratio and the shape disorder of the surface of a package even if the creeping motion is performed during the execution of precise winding. The yarn winding machine comprises: a guide driving section that reciprocally drives the traverse guide and can change a reverse position of the traverse guide in a yarn winding operation; and a control device. The control device is capable of executing: a 1 st reverse rotation control for decelerating the traverse guide traveling outward at a predetermined speed in the traverse direction, reversing the traverse guide inward at a 1 st reverse position, and accelerating the traverse guide again to the predetermined speed; and a 2 nd reverse rotation control for decelerating the traverse guide that travels outward at a predetermined speed in the traverse direction, reversing the traverse guide inward at a 2 nd reverse position that is inside the 1 st reverse position, and accelerating the traverse guide again to the predetermined speed. The control device makes the 2 nd reversal time (Trb) in the 2 nd reversal control longer than the 1 st reversal time (Tra) in the 1 st reversal control during the execution of the precision winding.)

1. A yarn winding machine configured to be capable of winding a running yarn around a rotating bobbin while traversing the yarn by a traverse guide, and forming a package while performing precise winding in which a winding ratio, which is a ratio of a rotational speed of the bobbin to a number of reciprocating movements per unit time of the traverse guide, is kept constant, the yarn winding machine comprising:

a guide driving section that reciprocates the traverse guide in a predetermined traverse direction and can change a reverse position of the traverse guide during a yarn winding operation; and

a control part for controlling the operation of the display device,

the control unit may perform:

a 1 st reverse rotation control of controlling the yarn guide driving section to decelerate the traverse yarn guide traveling outward at a predetermined speed in the traverse direction, to reverse the traverse yarn guide inward at a predetermined 1 st reverse rotation position, and to accelerate the traverse yarn guide again to the predetermined speed; and

a 2 nd reverse rotation control of controlling the yarn guide driving section to decelerate the traverse yarn guide traveling outward at the predetermined speed in the traverse direction, to reverse the traverse yarn guide inward at a 2 nd reverse rotation position located inward of the 1 st reverse rotation position, and to accelerate the traverse yarn guide again to the predetermined speed,

in the execution of the precision winding, a 2 nd reverse rotation time, which is a time from the start of deceleration of the traverse guide to the completion of re-acceleration in the 2 nd reverse rotation control, is made longer than a 1 st reverse rotation time, which is a time from the start of deceleration of the traverse guide to the completion of re-acceleration in the 1 st reverse rotation control.

2. The yarn winding machine of claim 1,

the control section increases the width of a region in which the traverse guide moves in the traverse direction in the 2 nd reversal time in the 2 nd reversal control as the distance between the 1 st reversal position and the 2 nd reversal position in the traverse direction is longer.

3. Yarn winding machine according to claim 1 or 2,

the control section controls the traverse guide driving section so that the traverse guide is located at the 2 nd reverse rotation position in the traverse direction when a half of the 2 nd reverse rotation time has elapsed since the start of deceleration of the traverse guide in the 2 nd reverse rotation control.

4. Yarn winding machine according to one of claims 1 to 3,

the yarn winding machine comprises a bobbin driving part for driving the bobbin in a rotating way,

the control section includes a storage section that stores information relating to a relationship between a rotation angle of the bobbin and a position of the traverse guide in the traverse direction,

the control unit controls the bobbin driving unit and the carrier driving unit based on the information stored in the storage unit.

5. Yarn winding machine according to one of claims 1 to 4,

the yarn carrier driving section includes a driving source configured to be capable of forward and reverse driving.

6. Yarn winding machine according to claim 5,

the yarn guide driving section includes a belt member to which the traverse yarn guide is attached and which is reciprocally driven by the driving source.

7. A yarn winding method for winding a running yarn around a rotating bobbin while traversing the yarn by a traverse guide, and forming a package while performing precise winding in which a winding ratio, which is a ratio of a rotational speed of the bobbin to the number of reciprocating movements per unit time of the traverse guide, is kept constant, characterized by comprising:

a 1 st reversing step of decelerating the traverse guide traveling outward at a predetermined speed in a predetermined traverse direction, reversing inward at a predetermined 1 st reversing position, and accelerating again to the predetermined speed; and

a 2 nd reversing step of decelerating the traverse guide that travels outward at the predetermined speed in the traverse direction, reversing inward at a 2 nd reversing position that is inside the 1 st reversing position, and accelerating again to the predetermined speed,

in the execution of the precision winding, a 2 nd reverse turning time, which is a time from the start of deceleration of the traverse guide to the completion of re-acceleration in the 2 nd reverse turning step, is made longer than a 1 st reverse turning time, which is a time from the start of deceleration of the traverse guide to the completion of re-acceleration in the 1 st reverse turning step.

Technical Field

The present invention relates to a yarn winding machine and a yarn winding method.

Background

Patent document 1 discloses a yarn winding machine that winds a yarn around a bobbin while traversing the yarn by a traverse guide to form a package. The yarn winding machine includes a bobbin driving motor for rotationally driving the bobbin, a yarn guide driving mechanism for reciprocating the traverse yarn guide by the yarn guide driving motor, and a control unit for controlling the bobbin driving motor and the yarn guide driving motor. As one of the yarn winding methods in such a yarn winding machine, there is a "precision winding" method in which the ratio (winding ratio) of the number of traverse times per unit time to the number of rotation of the bobbin is controlled to be constant. In precision winding, the winding ratio is generally set to a value slightly different from an integer so as not to cause double winding (so as not to cause the yarn to be repeatedly wound on the same path on the package surface). In this way, in the precision winding, the yarn can be wound in parallel and neatly while avoiding the lap winding and slightly shifting the winding path of the yarn on the package surface. This can improve the unwinding property of the yarn from the package to be formed, and can easily control the package density according to the application of the package.

In addition, patent document 2 discloses a traverse device capable of suppressing creeping of the flange of the package. The raised edge is a case where the amount of the yarn wound around the axial end portion of the package surface is larger than the amount of the yarn wound around the other portion due to the reason that the traverse guide is generally difficult to perform rapid reverse rotation (direction change) or the like. The convex edge may cause deterioration of the package shape and/or unevenness of the package density. The creeping is a case where the width of the reciprocating area (traverse width) of the traverse guide is temporarily narrowed during the package formation. Thus, the amount of the yarn wound around the axial end of the package is reduced and the bulge is relaxed, as compared with the case where the creeping motion is not performed.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 3-115060

Patent document 2: japanese patent laid-open publication No. 57-13058

Disclosure of Invention

Problems to be solved by the invention

In the yarn winding machine described in patent document 1, when creeping is to be performed during precision winding, the following problem may occur (more specifically, the following description will be given in the embodiment). First, for example, when the traverse width during the creeping motion is simply made narrower than that during the normal traverse (hereinafter referred to as the normal time), the traverse cycle varies and the winding ratio cannot be kept constant. Therefore, the position where the yarn is actually wound on the package surface is shifted from the position where the yarn is originally intended to be wound, and the shape of the package surface is disturbed. Therefore, in order to prevent this, it is necessary to perform creeping without changing the traverse cycle. However, for example, when the winding ratio is made constant by simply changing the moving speed of the traverse guide between the normal state and the creeping state, the angle (winding angle) formed by the yarn and the package surface at this time is deviated from each other between the normal state and the creeping state. Therefore, the shape of the package surface is still disturbed.

The purpose of the present invention is to suppress fluctuations in the winding ratio and shape disturbances on the package surface even when creep occurs during the execution of precision winding.

Means for solving the problems

The yarn winding machine according to claim 1 is configured to be capable of winding a running yarn around a rotating bobbin while traversing the yarn by a traverse guide, and forming a package while performing precise winding in which a winding ratio, which is a ratio of a rotational speed of the bobbin to the number of times of reciprocating movement per unit time of the traverse guide, is kept constant, and the yarn winding machine includes: a guide driving section that reciprocates the traverse guide in a predetermined traverse direction and can change a reverse position of the traverse guide during a yarn winding operation; and a control unit capable of executing: a 1 st reverse rotation control of controlling the yarn guide driving section to decelerate the traverse yarn guide traveling outward at a predetermined speed in the traverse direction, to reverse the traverse yarn guide inward at a predetermined 1 st reverse rotation position, and to accelerate the traverse yarn guide again to the predetermined speed; and a 2 nd reverse rotation control of controlling the yarn guide driving section to decelerate the traverse yarn guide traveling outward at the predetermined speed in the traverse direction, to reverse the traverse yarn guide inward at a 2 nd reverse rotation position located inward of the 1 st reverse rotation position, and to accelerate the traverse yarn guide again to the predetermined speed, wherein a 2 nd reverse rotation time, which is a time from a start of deceleration of the traverse yarn guide to completion of re-acceleration in the 2 nd reverse rotation control, is made longer than a 1 st reverse rotation time, which is a time from a start of deceleration of the traverse yarn guide to completion of re-acceleration in the 1 st reverse rotation control, during execution of the precision winding.

As a premise for performing the precise winding normally while the creeping motion is performed, it is necessary to equalize the winding ratio between a case where the traverse guide is reversed at the 1 st reversal position (hereinafter, also referred to as a normal time) and a case where the traverse guide is reversed at the 2 nd reversal position (hereinafter, also referred to as a creeping motion). In order to equalize the winding ratio, for example, when the rotational speed of the bobbin is constant, in the case of creeping in which the width of the traverse guide movement region is narrower than in the normal state, it is necessary to equalize the traverse guide movement cycle to the normal state.

In the present invention, the 2 nd inversion time is longer than the 1 st inversion time. By positively extending the reverse rotation time during the creeping motion in this manner, the movement cycle of the traverse guide during the creeping motion can be extended. This makes it possible to equalize the movement cycle of the traverse guide between the normal time and the creep time. Therefore, the variation of the winding ratio can be prevented.

Further, since the traverse cycle at the creeping time can be adjusted by adjusting the 2 nd reverse rotation time in this manner, the traveling speed of the traverse guide can be made equal to that at the creeping time at a timing other than the reverse rotation time. Therefore, the angle of the yarn wound around the package surface can be made uniform. Therefore, the shape disorder of the package surface can be suppressed.

As described above, even if creeping occurs during the execution of the precision winding, it is possible to suppress the variation of the winding ratio and to suppress the shape disorder of the package surface.

The yarn winding machine according to claim 2 is characterized in that, in the above-described 1 st invention, the control section increases the width of a region in which the traverse guide moves in the traverse direction in the 2 nd reversal control, the longer the distance between the 1 st reversal position and the 2 nd reversal position in the traverse direction is, the wider the control section increases the width of the region in which the traverse guide moves in the traverse direction in the 2 nd reversal time.

In order to suppress the disturbance of the shape of the package surface while suppressing the variation of the winding ratio, the longer the distance between the 1 st and 2 nd reversing positions (that is, the narrower the traverse width at the time of creeping), the longer the 2 nd reversing time is required. Here, when the width of the region in which the traverse guide moves in the traverse direction (hereinafter referred to as the reversal region) is constant in the 2 nd reversal time, the traverse guide continues to be located in the region near the 2 nd reversal position for a long time in the 2 nd reversal control when the 2 nd reversal time is long. Thus, the yarn can be easily wound in a concentrated manner in a narrow region of the package surface. As a result, a level difference is likely to be formed on the package surface, and yarn breakage or the like of the yarn may occur, which may adversely affect the shape of the package or the like.

In the present invention, the longer the distance between the 1 st inversion position and the 2 nd inversion position, the wider the inversion region is. That is, when the traverse width in the creep is narrowed and the 2 nd reverse rotation time is lengthened, the range in which the traverse guide can move in the 2 nd reverse rotation control is widened. Therefore, the traverse guide can be prevented from being continuously located in a narrow region in the traverse direction for a long time. Therefore, the yarn can be prevented from being intensively wound in a narrow region of the package surface.

In the yarn winding machine according to claim 3, in the 1 st or 2 nd invention, the control section controls the yarn guide driving section in the 2 nd reversal control such that the traverse guide is located at the 2 nd reversal position in the traverse direction when a half of the 2 nd reversal time elapses from the start of deceleration of the traverse guide.

In the 2 nd reverse rotation control, for example, the traverse guide may be rapidly decelerated to reach the 2 nd reverse rotation position, and then slowly accelerated again. However, in this case, there is a possibility that the shape of the reversed part of the yarn wound on the package surface is greatly different between when the traverse guide decelerates and when it reaccelerates. Therefore, the shape of the yarn reversal portion on the package surface becomes asymmetric, and there is a possibility that the reversal portion cannot be formed neatly. In the present invention, the time from the start of deceleration of the traverse guide to the time when the traverse guide reaches the 2 nd reversal position can be made equal to the time from the departure of the traverse guide from the 2 nd reversal position to the completion of re-acceleration. Thus, the shape of the yarn reversal portion can be made symmetrical about the center axis of the package (i.e., the reversal portion can be formed neatly). Therefore, the shape disorder of the reversed part of the package surface can be suppressed.

The yarn winding machine according to claim 4 is characterized in that, in any one of the inventions 1 to 3, the yarn winding machine includes a bobbin driving section for rotationally driving the bobbin, the control section includes a storage section for storing information relating to a relationship between a rotation angle of the bobbin and a position of the traverse guide in the traverse direction, and the control section controls the bobbin driving section and the guide driving section based on the information stored in the storage section.

In the present invention, by performing control based on information relating to the relationship between the rotation angle of the bobbin and the position of the traverse guide, it is possible to facilitate complicated operations such as creeping while maintaining the winding ratio constant, for example, as compared with the case of performing control using a complicated mechanical structure. Further, by rewriting this information, the position, speed, and the like of the traverse guide can be easily adjusted in the 2 nd reversal control.

The yarn winding machine according to claim 5 is characterized in that, in any one of the inventions 1 to 4, the carrier driving section includes a driving source configured to be capable of forward and reverse driving.

For example, in a general cam type traverse device, a motor rotating in one direction is used as a drive source, and a structure for performing creeping becomes a complicated mechanical structure. Therefore, in the cam type traverse device, it is difficult to finely control the creep. In the present invention, the traverse guide can be reciprocated by forward and reverse driving of the driving source. Therefore, the control section can finely control the reverse rotation position, the timing, and the like of the traverse guide. Thus, fine control of the creep can be easily performed.

In the yarn winding machine according to claim 6, in the above-described 5, the carrier driving section includes a belt member to which the traverse carrier is attached and which is reciprocatingly driven by the driving source.

For example, in a configuration in which a traverse guide is attached to the tip of a swingable arm and the arm is driven to swing, the traverse guide reciprocates so as to describe an arc. Therefore, even when the precise winding is performed, it may be difficult to wind the yarn neatly on the package surface. In the present invention, the traverse guide can be easily reciprocated linearly by drawing the portion of the belt member to which the traverse guide is attached to a linear shape and performing the reciprocating drive. Therefore, the yarn can be wound neatly on the package surface easily.

A yarn winding method according to claim 7 is a yarn winding method for winding a running yarn around a rotating bobbin while traversing the yarn by a traverse guide, and forming a package while performing precise winding in which a winding ratio, which is a ratio of a rotational speed of the bobbin to a number of reciprocating movements per unit time of the traverse guide, is kept constant, the method comprising: a 1 st reversing step of decelerating the traverse guide traveling outward at a predetermined speed in a predetermined traverse direction, reversing inward at a predetermined 1 st reversing position, and accelerating again to the predetermined speed; and a 2 nd reversing step of decelerating the traverse guide traveling outward at the predetermined speed in the traverse direction, reversing the traverse guide inward at a 2 nd reversing position located inward of the 1 st reversing position, and accelerating the traverse guide again to the predetermined speed, wherein during execution of the precision winding, a 2 nd reversing time, which is a time from start of deceleration of the traverse guide to completion of re-acceleration in the 2 nd reversing step, is longer than a 1 st reversing time, which is a time from start of deceleration of the traverse guide to completion of re-acceleration in the 1 st reversing step.

In the present invention, similarly to the invention 1, even if creeping is performed during the execution of the precision winding, the fluctuation of the winding ratio can be suppressed, and the shape disorder of the package surface can be suppressed.

Drawings

Fig. 1 is a schematic view of the rewinding machine according to the present embodiment as viewed from the front.

Fig. 2 is a diagram showing an electrical configuration of the rewinding machine.

Fig. 3 (a) is a graph showing a relationship between the position of the traverse guide and time, and (b) is a graph showing a relationship between the speed of the traverse guide and time.

FIGS. 4 (a) and (b) are explanatory views of the precision winding, and (c) is an explanatory view of the creep.

Fig. 5 (a) is a graph showing a relationship between the speed of the traverse guide and time, and (b) is an explanatory diagram showing a path of the yarn on the surface of the winding package.

Fig. 6 (a) is a graph showing a relationship between the speed of the traverse guide and time, and (b) is an explanatory diagram showing a path of the yarn on the surface of the winding package.

Fig. 7 (a) is a graph showing a relationship between the position of the traverse guide and time, and (b) is a graph showing a relationship between the speed of the traverse guide and time.

Fig. 8 (a) is a graph showing a relationship between acceleration of the traverse guide and time, and (b) is a graph showing a relationship between a width of the reversal region and a creep amount.

Fig. 9 (a) and (b) are explanatory views showing the path of the yarn on the package surface.

Fig. 10 (a) is a graph showing a relationship between the position and time of the traverse guide in the modification, and (b) is a graph showing a relationship between the speed and time of the same traverse guide.

Fig. 11 is a graph showing a relationship between acceleration and time of the traverse guide in the modification shown in fig. 10.

Detailed Description

Next, an embodiment of the present invention will be described with reference to fig. 1 to 9. The vertical direction and the horizontal direction shown in fig. 1 are the vertical direction and the horizontal direction of the rewinder 1, respectively. A direction orthogonal to both the vertical direction and the horizontal direction (a direction perpendicular to the paper surface of fig. 1) is defined as a front-rear direction. The direction in which the yarn Y travels is referred to as the yarn travel direction.

(construction of rewinding machine)

First, the structure of the rewinding machine 1 (yarn winding machine of the present invention) according to the present embodiment will be described with reference to fig. 1. Fig. 1 is a schematic view of the rewinding machine 1 viewed from the front. As shown in fig. 1, the rewinder 1 includes a yarn feeding unit 11, a winding unit 12, a control device 13 (a control unit of the present invention), and the like. The rewinder 1 unwinds the yarn Y from the yarn supply package Ps supported by the yarn supply section 11, and rewinds the yarn Y on a winding bobbin Bw (a bobbin of the present invention) by a winding section 12 to form a winding package Pw (a package of the present invention). More specifically, the rewinder 1 is used to rewind the yarn Y wound around the yarn supply package Ps more regularly, or to form a winding package Pw of a desired density, for example.

The yarn feeder 11 is mounted on the front surface of the lower part of the vertically-installed machine body 14, for example. The yarn feeding section 11 is configured to support a yarn feeding package Ps formed by winding the yarn Y around the yarn feeding bobbin Bs. Thereby, the yarn feeding portion 11 can feed the yarn Y.

The winding unit 12 winds the yarn Y around the winding bobbin Bw to form a winding package Pw. The winding unit 12 is provided at an upper portion of the machine body 14. The winding section 12 includes a cradle arm 21, a winding motor 22 (a bobbin driving section of the present invention), a traverse 23, a contact roller 24, and the like.

The rocker arm 21 is supported by the body 14, for example, so as to be able to swing. The cradle arm 21 supports the winding bobbin Bw rotatably with the left-right direction as the axial direction of the winding bobbin Bw, for example. A bobbin holder (not shown) for holding the winding bobbin Bw is rotatably attached to a distal end portion of the cradle arm 21. The take-up motor 22 is used to rotationally drive the bobbin holder. The winding motor 22 is, for example, a general ac motor, and is configured to be capable of changing the rotation speed. Thereby, the winding motor 22 can change the rotation speed of the winding bobbin Bw. The winding motor 22 is electrically connected to the control device 13 (see fig. 2).

The traverse device 23 is a device for traversing the yarn Y in the axial direction (in the present embodiment, the left-right direction) of the winding bobbin Bw. The traverse device 23 is disposed immediately upstream of the winding package Pw in the yarn traveling direction. The traverse device 23 includes a traverse motor 31 (a guide driving section of the present invention), an endless belt 32 (a belt member of the present invention), and a traverse guide 33.

The traverse motor 31 is, for example, a general ac motor. The traverse motor 31 is a driving source configured to be capable of normal rotation driving and reverse rotation driving and configured to be capable of changing the rotation speed. The traverse motor 31 is electrically connected to the control device 13 (see fig. 2). The endless belt 32 is a belt member to which a traverse guide 33 is attached. The endless belt 32 is wound around a pulley 34 and a pulley 35 which are disposed apart from each other in the left-right direction, and a drive pulley 36 connected to the rotation shaft of the traverse motor 31, and is stretched in a substantially triangular shape. The endless belt 32 is reciprocally driven by the traverse motor 31. The traverse guide 33 is attached to the endless belt 32 and disposed between the pulley 34 and the pulley 35 in the left-right direction. The traverse motor 31 reciprocally drives the endless belt 32, thereby linearly reciprocating the traverse guide 33 in the left-right direction (see an arrow in fig. 1). Thereby, the traverse guide 33 traverses the yarn Y in the left-right direction. Hereinafter, the left-right direction is also referred to as a traverse direction. In the traverse device 23 having the above-described configuration, the width of the movement region of the traverse guide 33 (traverse width) can be changed in the winding operation of the yarn Y by controlling the timing of switching the rotational direction of the rotary shaft of the traverse motor 31 and the like.

The contact roller 24 is used to apply a contact pressure to the surface of the winding package Pw to adjust the shape of the winding package Pw. The contact roller 24 is in contact with the winding package Pw and rotates in accordance with the rotation of the winding package Pw.

A yarn guide 15, a guide roller 16, and a tension sensor 17 are arranged in this order from the upstream side between the yarn feeding unit 11 and the winding unit 12 in the yarn traveling direction. The yarn guide 15 is disposed, for example, on an extension of the central axis of the yarn supplying bobbin Bs, and guides the yarn Y unwound from the yarn supplying package Ps to the downstream side in the yarn traveling direction. The guide roller 16 is for guiding the yarn Y guided by the carrier 15 further toward the downstream side in the yarn traveling direction. The guide roller 16 is disposed on the front surface of the machine body 14 and above the yarn guide 15. The guide roller 16 is rotationally driven by, for example, a roller drive motor 18. The roller drive motor 18 is, for example, a general ac motor, and is configured to be capable of changing the rotation speed. Thereby, the roller drive motor 18 can change the rotation speed of the guide roller 16. The roller drive motor 18 is electrically connected to the control device 13 (see fig. 2). In the present embodiment, tension is applied to the yarn Y by the speed difference between the peripheral speed of the guide roller 16 and the peripheral speed of the winding package Pw.

The tension sensor 17 is disposed between the winding package Pw and the guide roller 16 in the yarn running direction, and detects the tension applied to the yarn Y. The tension sensor 17 is electrically connected to the control device 13 (see fig. 2), and transmits the detection result of the tension to the control device 13.

The control device 13 includes a CPU, a ROM, a RAM (storage unit 19), and the like. The storage unit 19 stores parameters such as the amount of yarn Y wound, the winding speed, and the strength of tension applied to the yarn Y. The control device 13 controls each unit by the CPU according to a program stored in the ROM based on parameters and the like stored in the RAM (storage unit 19).

In the rewinding machine 1 as described above, the yarn Y unwound from the yarn supply package Ps travels downstream in the yarn traveling direction. The running yarn Y is wound around the rotating winding bobbin Bw while traversing in the left-right direction (traverse direction) by the traverse guide 33 (yarn winding operation).

(traverse guide movement control)

Next, basic movement control of the traverse guide 33 by the control device 13 will be described with reference to fig. 3. Fig. 3 (a) is a graph showing a relationship between the position of the traverse guide 33 in the traverse direction and time. Fig. 3 (b) is a graph showing a relationship between the speed of the traverse guide 33 in the traverse direction and time.

Information on the traverse width is stored in the storage section 19 (see fig. 2) of the control device 13. The control device 13 controls the traverse motor 31 based on the information stored in the storage section 19. Thereby, the endless belt 32 is driven to reciprocate, and the traverse guide 33 reciprocates in the traverse direction.

In the graph shown in fig. 3 (a), the horizontal axis represents time, and the vertical axis represents the position of the traverse guide 33 in the traverse direction. For convenience of explanation, the region (traverse region) where the traverse guide 33 reciprocates is set to the left side with respect to the center of the region in the left-right direction as the positive direction of the vertical axis of the graph. The right side of the center of the traverse region is set as the negative direction of the vertical axis of the graph.

For example, when the traverse width is W, the traverse guide 33 reciprocates in the traverse direction in a range of-W/2 to W/2 as shown in fig. 3 (a). More specifically, for example, at a predetermined timing (the left end of the graph of fig. 3 (a)), the traverse guide 33 is positioned at the right end (-W/2 position). After a predetermined time (T) has elapsed, the traverse guide 33 moves to the left end (W/2 position). After that, the traverse guide 33 is reversed in the right direction and reaches the right end again. By repeating the above operation, the traverse guide 33 reciprocates.

In the graph shown in fig. 3 (b), the horizontal axis represents time, and the vertical axis represents the speed of the traverse guide 33 in the traverse direction. Specific examples will be described below. When the traverse guide 33 is positioned at the right end (-W/2 position), the speed of the traverse guide 33 is zero. The control device 13 controls the traverse motor 31 to accelerate the traverse guide 33 to a predetermined speed (V). Thereafter, the control device 13 maintains the speed of the traverse guide 33 constant until the traverse guide 33 reaches the vicinity of the left end (W/2 position). When the traverse guide 33 reaches the vicinity of the left end, the control device 13 controls the traverse motor 31 to perform the following reverse control. That is, the control device 13 decelerates the traverse guide 33 traveling to the left (outside in the traverse direction) and reverses the traverse guide to the right (inside in the traverse direction) at the position of W/2. After that, the control device 13 accelerates the traverse guide 33 again to a predetermined speed (see-V in fig. 3 (b)). In the present embodiment, the time from the start of deceleration of the traverse guide 33 to the completion of re-acceleration in the reverse rotation control is referred to as a reverse rotation time (Tr shown in fig. 3 (a) and (b)).

(precision winding and creep)

Next, the precision winding and creep will be described with reference to (a) to (c) of fig. 4. Fig. 4 (a) and (b) are explanatory views of the precision winding, and are views in which the winding package Pw is unwound in the rotational angle direction. For convenience of explanation, as shown in fig. 4 (a) and (b), the rotation angle at the upper end of the paper surface of the winding package Pw is 0 degree, and the rotation angle at the lower end of the paper surface is 360 degrees. Fig. 4 (c) is an explanatory view of the creep.

First, precision winding will be described. The precision winding is a winding method in which the ratio (winding ratio) of the rotational speed of the winding bobbin Bw to the number of reciprocating movements per unit time of the traverse guide 33 is maintained constant. Thus, the relationship between the rotation angle of the winding tube Bw and the position of the traverse guide 33 in the traverse direction can be controlled regardless of the winding diameter of the winding package Pw.

The storage unit 19 (see fig. 2) of the control device 13 stores, for example, information (a table and a calculation formula) relating to the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33 in the traverse direction. Specifically, the storage section 19 stores the rotation angle of the winding bobbin Bw, the acceleration/deceleration start position and the reverse position of the traverse guide 33 in the traverse direction in association with each other. Further, the storage unit 19 stores a calculation formula for calculating the speed and/or acceleration of the traverse guide 33 based on the information on the rotation angle of the winding bobbin Bw and the information on the position of the traverse guide 33. The control device 13 controls the winding motor 22 and the traverse motor 31 based on the information stored in the storage section 19. In the present embodiment, the control device 13 controls the winding motor 22 so as to maintain the rotation speed of the winding bobbin Bw constant. As a first example, as shown in fig. 4 (a), when the winding ratio is set to 5, the winding bobbin Bw rotates five turns each time the traverse guide 33 reciprocates once. That is, as shown in fig. 4 (a), every time the traverse guide 33 reciprocates once, the yarn Y can be wound by an amount corresponding to five revolutions of the winding package Pw.

In addition, when the winding ratio is an integer as described above, there are problems as follows: the yarn Y is repeatedly wound on the same path on the surface of the winding package Pw (so-called lap winding occurs). To avoid this problem, actually, as shown in fig. 4 (b), the winding ratio is set to a value slightly different from the integer (for example, 5+ α). Thus, in the precision winding, the yarn Y can be wound in parallel and orderly while avoiding the lap winding and slightly shifting the winding path of the yarn Y on the surface of the winding package Pw. This can improve the unwinding property of the yarn Y from the winding package Pw in the subsequent step, and can easily control the package density in accordance with the application of the winding package Pw.

Next, the creep will be described. The creeping is to temporarily change the traverse width during the winding operation of the yarn Y in order to suppress the bulge of the winding package Pw. The raised edge is a case where the amount of the yarn wound around the axial end portion of the surface of the winding package Pw is larger than the amount of the yarn wound around other portions due to the reason that the traverse guide 33 is generally difficult to be rapidly reversed. As a result, a step is likely to be formed on the surface of the winding package Pw, and yarn drop of the yarn Y may occur. Further, the shape of the winding package Pw may deteriorate and/or the density of the winding package Pw may become uneven.

As described above, the traverse device 23 is configured to reciprocally drive the endless belt 32 to which the traverse guide 33 is attached by the traverse motor 31. Therefore, the reverse rotation position of the traverse guide 33 can be arbitrarily changed by controlling the traverse motor 31 by the control device 13. As an example, as shown in fig. 4 (c), the control device 13 is configured to be able to switch the traverse width (i.e., to be able to move with a crawl motion) between a predetermined 1 st width (Wa) and a 2 nd width (Wb) smaller than the 1 st width. Hereinafter, the normal time is assumed when the traverse width is the 1 st width, and the creep time is assumed when the traverse width is the 2 nd width. The distance between the reverse rotation position of the traverse guide 33 in the normal state and the reverse rotation position of the traverse guide 33 in the creeping state is Δ W ((Wa-Wb)/2). Hereinafter, this distance is also referred to as a creep amount. The control device 13 can change the amount of creep by controlling the traverse motor 31. The creep amount is generally about 5 to 20mm, but is not limited thereto. Further, the control device 13 can execute the creep at an arbitrary timing. As an example, as shown in fig. 4 (c), the control device 13 may execute one crawl every 3 times the traverse guide 33 reciprocates. By performing the creeping, the amount of the yarn wound around the axial end of the winding package Pw can be reduced as compared with the case where the creeping is not performed, and the bulge can be relaxed.

Here, when it is intended to perform creep in the process of performing precision winding, the following problems may occur. Specifically, (a) and (b) of fig. 5 and (a) and (b) of fig. 6 will be described. Fig. 5 (a) is a graph showing a relationship between the speed and time of the traverse guide 33 in a case where the traverse width is simply narrowed during the creep (which will be described in detail later), and is the same graph as fig. 3 (b). Fig. 5 (b) is an explanatory view showing a path of the yarn Y on the surface of the winding package Pw in the case where the traverse width is simply narrowed at the time of creeping, and is an enlarged view of the left end of the winding package Pw. Fig. 6 (a) is a graph showing a relationship between the speed of the traverse guide 33 and time in a case where the traverse speed is simply reduced during the creep (which will be described in detail later), and is the same graph as fig. 3 (b). Fig. 6 (b) is an explanatory view showing a path of the yarn Y on the surface of the winding package Pw in the case where the traverse speed is simply slowed down in the creeping, and is an enlarged view of the left end of the winding package Pw. In the graphs shown in fig. 5 (a) and 6 (a), the solid line indicates the traverse speed in the normal state, and the broken line indicates the traverse speed in the creeping state.

First, a case where the traverse width is narrowed more easily in the creep than in the normal case will be described. The simple narrowing of the traverse width means that only the execution timing of the reverse rotation control is changed without changing the reverse rotation time (Tr) and the traverse speed (V) other than the reverse rotation control as shown in fig. 5 (a). In this case, the traverse width is narrowed only by reversing the traverse guide 33 earlier than in the normal state during the creeping. Thus, the traverse cycle is shortened in the creep compared to the normal time. Therefore, the path of the yarn Y on the surface of the winding package Pw where the precise winding is not normally performed is as shown in fig. 5 (b). That is, the yarns Y1 and Y2, which are portions of the yarn Y wound around the winding package Pw in the normal state, are reversed at the points 101 and 102 on the end surface Pw1 of the winding package Pw, respectively. In the creeping, the yarn Y3, which is a part of the yarn Y wound in the winding package Pw, is reversed at a point 103 located inside of the points 101 and 102 by Δ W in the traverse direction. The point 103 is located on the front side in the rotational angle direction than the reversal position (point 104) in the case where the traverse width when winding the yarn Y3 is assumed to be the same as in the normal case. That is, the yarn Y3 is wound in a state greatly deviated from the path 105 in which the yarn Y is wound without creeping. Therefore, the shape of the surface of the winding package Pw is disturbed.

Next, a case where the traverse speed is simply slowed down in the creep time as compared with the normal time will be described. The simple slowing of the traverse speed means slowing of the traverse speed other than the reverse rotation control time, as compared with the normal time, without changing the reverse rotation time (Tr) and the execution timing of the reverse rotation control, as shown in fig. 6 (a). For example, when the traverse speed in the normal state is Va and the traverse speed in the creeping state is Vb, Vb < Va. In this case, since the traverse cycle is the same in the normal state and the peristaltic state, the winding ratio is also maintained constant. In this case, as shown in fig. 6 (b), the yarn Y3 wound during creep is reversed at a point 106. The point 106 is at the same position in the rotational angle direction as the point 104 described above. However, in this case, the angle (winding angle) formed by the yarn Y and the winding package Pw deviates from each other between the normal time and the creeping time due to the change in the traverse speed. That is, the yarns Y1 and Y2, which are portions of the yarn Y wound around the winding package Pw in the normal state, and the yarn Y3, which is a portion of the yarn Y wound around the winding package Pw in the creep state, are not parallel to each other. Therefore, the shape of the surface of the winding package Pw remains disturbed. Therefore, in the present embodiment, the control device 13 performs the following control so that the fluctuation of the winding ratio can be suppressed even when the creep is generated during the execution of the precision winding and the disturbance of the surface shape of the winding package Pw can be suppressed.

(details of yarn winding method Using reverse control)

The details of the yarn winding method using the reversal control performed by the control device 13 will be described with reference to fig. 7 (a) and (b), fig. 8 (a) and (b), and fig. 9 (a) and (b). Fig. 7 (a) is a graph showing a relationship between the position of the traverse guide 33 in the traverse direction and time. Fig. 7 (b) is a graph showing a relationship between the speed of the traverse guide 33 in the traverse direction and time. Fig. 8 (a) is a graph showing a relationship between acceleration of the traverse guide 33 in the traverse direction and time. Fig. 8 (b) is a graph showing the relationship between the width of the inversion region and the creep amount, which will be described later. Fig. 9 (a) and 9 (b) are explanatory views showing a path of the yarn Y on the surface of the winding package Pw, and are the same as the explanatory views in fig. 5 (b) and 6 (b). In the following description, it is assumed that the rotation speed of the winding package Pw is constant.

First, the control device 13 performs the following control as the reverse rotation control (1 st reverse rotation control) in a normal state. In the 1 st reversal control, the control device 13 reverses the traverse guide 33 at the 1 st reversal position (Wa/2 in fig. 7 (a)) in the traverse direction (1 st reversal step). In the 1 st reverse rotation control, the time from the start of deceleration to the completion of re-acceleration of the traverse guide 33 is set to the 1 st reverse rotation time (Tra). The control device 13 performs the following control as reverse control (2 nd reverse control) during creep. In the 2 nd reverse rotation control, the control device 13 reverses the traverse guide 33 at the 2 nd reverse rotation position (Wb/2 of fig. 7 (a)) in the traverse direction (the 2 nd reverse rotation step). In the 2 nd reverse rotation control, the time from the start of deceleration to the completion of re-acceleration of the traverse guide 33 is set to the 2 nd reverse rotation time (Trb). Further, a region in which the traverse guide 33 moves in the traverse direction from the start of deceleration to the completion of re-acceleration is set as a reverse region. The width of the inversion region in the 2 nd inversion control is set to Wt, for example (see fig. 7 (a)).

As shown in fig. 7 (a), the control device 13 makes the 2 nd inversion time longer than the 1 st inversion time (Trb > Tra). From another point of view, the control device 13 accelerates or decelerates the traverse guide 33 more slowly in the 2 nd reverse rotation control than in the 1 st reverse rotation control. More specifically, the maximum value (Aa) of the acceleration in the 2 nd inversion time (Ab) in the 2 nd inversion control is smaller than the maximum value (Aa) of the acceleration in the 1 st inversion time in the 1 st inversion control (see fig. 8 (a)). In other words, the time average value of the acceleration in the 2 nd reversal time at the 2 nd reversal control is reduced as compared with the time average value of the acceleration in the 1 st reversal time at the 1 st reversal control.

Thus, even when the traverse widths are different between the normal time and the creep time, the traverse cycles can be made equal (see fig. 7 (a)). That is, variation in the winding ratio can be suppressed. The control device 13 makes the traverse speed other than the reverse rotation control equal to that in the normal time and the creep time (see fig. 7 (b)). In the 2 nd reverse rotation control, when the half time (Trb/2) of the 2 nd reverse rotation time elapses from the start of deceleration of the traverse guide 33, the control device 13 controls the traverse motor 31 so that the traverse guide 33 is positioned at the 2 nd reverse rotation position.

By performing the control as described above, the yarn Y is wound in the winding package Pw as shown in fig. 9 (a). That is, the portion of the yarn Y (yarn Y3) wound around the winding package Pw during creeping reverses in the traverse direction at point 107. The point 107 is at the same position in the rotational angle direction as the point 104 described above. In the 2 nd reverse rotation control (i.e., when the traverse guide 33 moves in the reverse rotation region), the yarn Y3 is wound around the winding package Pw so as to describe an arc (see the hatched region 201 in fig. 9 (a)). Since the traverse speeds other than the reverse rotation control are equal to each other in the normal operation and the creep operation, the winding angles other than the reverse rotation control are equal to each other in the normal operation and the creep operation. Thereby, the yarn Y3 is wound along the path 105 on the traverse direction inner side than the region 201. That is, in the present embodiment, the precision winding can be performed normally, and the disturbance of the surface shape of the winding package Pw can be suppressed.

As described above, when the half time (Trb/2) of the 2 nd reversal time elapses from the start of deceleration of the traverse guide 33, the traverse guide 33 is located at the 2 nd reversal position. Therefore, the reversed part of the yarn Y3 has a symmetrical shape with respect to the central axis of the winding package Pw as the center line. That is, the reversed part of the yarn Y3 is formed neatly.

The control device 13 increases the width of the inversion region in the traverse direction as the creep amount increases (see fig. 8 (b)). For example, when the creep amount is Δ W1 larger than Δ W, the controller 13 sets the width of the inversion region to Wt1 (see fig. 9 (a) and (b)). That is, when the 2 nd reverse rotation time is long due to the narrowing of the traverse width in the creeping motion, the traverse guide 33 is moved in the traverse direction in the 2 nd reverse rotation control over a wider range. Therefore, the traverse guide 33 can be prevented from being continuously located in a narrow region in the traverse direction for a long time. In this case, the arc drawn by the yarn Y3 when wound in the winding package Pw becomes large (see the region 202 in fig. 9 (b)).

As described above, the 2 nd inversion time is longer than the 1 st inversion time. By positively extending the reverse rotation time during the creeping motion in this manner, the movement cycle of the traverse guide 33 during the creeping motion can be extended. This makes it possible to equalize the movement cycle of the traverse guide 33 between the normal time and the creep time. Therefore, the winding ratio can be prevented from varying.

Further, since the traverse cycle during the creeping motion can be adjusted by adjusting the 2 nd reverse rotation time in this manner, the traveling speed of the traverse guide 33 can be made equal to that during the creeping motion at a timing other than the reverse rotation. Therefore, the angle of the yarn Y wound around the surface of the winding package Pw can be made uniform. Therefore, the disturbance of the surface shape of the winding package Pw can be suppressed.

Further, the larger the creep amount, the wider the width of the inversion region. That is, when the 2 nd reverse rotation time is long due to the narrowing of the traverse width in the creeping, the range in which the traverse guide 33 can move is widened in the 2 nd reverse rotation control. Therefore, the traverse guide 33 can be prevented from being continuously located in a narrow region in the traverse direction for a long time. Therefore, the yarn Y can be prevented from being intensively wound in a narrow region on the surface of the winding package Pw.

Further, the time from when the traverse guide 33 starts decelerating to when the traverse guide 33 reaches the 2 nd reversal position can be made equal to the time from when the traverse guide 33 leaves the 2 nd reversal position to when the re-acceleration is completed. Thus, the shape of the reversed part of the yarn Y can be made symmetrical about the central axis of the winding package Pw (i.e., the reversed part can be formed in order). Therefore, the shape disturbance of the reversed part of the surface of the winding package Pw can be suppressed.

The control device 13 performs control based on information on the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33. Thus, for example, compared to a case where control using a complicated mechanical structure is performed, it is possible to facilitate a complicated operation of performing creep while maintaining the winding ratio constant. Further, by rewriting this information, the position, speed, and the like of the traverse guide 33 can be easily adjusted in the 2 nd reversal control.

The traverse motor 31 is configured to be capable of driving in the normal direction and the reverse direction. Thus, the traverse guide 33 can be reciprocated by the forward and reverse driving of the traverse motor 31. Therefore, the control section can finely control the reverse rotation position, the timing, and the like of the traverse guide 33. Thus, fine control of the creep can be easily performed.

Further, by drawing the portion of the endless belt 32 to which the traverse guide 33 is attached linearly and performing the reciprocating drive, the traverse guide 33 can be easily reciprocated linearly. Therefore, the yarn Y can be wound neatly on the surface of the winding package Pw.

Next, a modification of the above embodiment will be described. Here, the same reference numerals are given to portions having the same configuration as those of the above-described embodiment, and the description thereof will be appropriately omitted.

(1) In the above embodiment, the control device 13 accelerates or decelerates the traverse guide 33 more slowly in the 2 nd reverse rotation control than in the 1 st reverse rotation control, but the present invention is not limited to this. For example, as shown in fig. 10 (a), (b), and 11, the controller 13 may make the maximum value of the acceleration in the 2 nd inversion time in the 2 nd inversion control equal to the maximum value of the acceleration in the 1 st inversion time in the 1 st inversion control. The control device 13 may stop the traverse guide 33 at the 2 nd reversal position in the traverse direction for a predetermined time and then accelerate it again. In this manner, the 2 nd inversion time may be longer than the 1 st inversion time. When the 2 nd inversion control in the above embodiment is the a control and the 2 nd inversion control in the above modification (fig. 10 (a), (B), and fig. 11) is the B control, the controller 13 may perform the following control. That is, the control device 13 may perform only the a control or only the B control as the 2 nd reverse rotation control in the winding operation. Alternatively, the control device 13 may perform a combination of the a control and the B control during the winding operation. More specifically, the control device 13 may repeat the a control and the B control in a predetermined pattern as the 2 nd inversion control. As an example of repetition, the control device 13 may alternately perform the a control and the B control.

(2) In the embodiments described above, the width of the reverse rotation region of the traverse guide 33 in the traverse direction is made wider as the amount of creep is larger, but the present invention is not limited to this. The width of the inversion region may also be constant regardless of the amount of creep.

(3) In the above-described embodiments, the control device 13 controls the traverse motor 31 so that the traverse guide 33 is positioned at the 2 nd reversal position when half of the 2 nd reversal time has elapsed since the traverse guide 33 started decelerating in the 2 nd reversal control. However, the present invention is not limited thereto. For example, in the 2 nd reverse rotation control, the control device 13 may perform control such as rapidly decelerating the traverse guide 33 and then slowly accelerating it again. Alternatively, the control device 13 may perform control such as slowly decelerating the traverse guide 33 and then rapidly accelerating the traverse guide in the 2 nd reverse rotation control.

(4) In the above-described embodiments, the storage unit 19 of the control device 13 stores both the table and the calculation formula as the information relating to the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33 in the traverse direction, but the present invention is not limited to this. For example, the storage unit 19 may store only a calculation formula for calculating the position, the speed, and the like of the traverse guide 33 based on the rotation angle of the winding bobbin Bw. That is, the control device 13 may constantly calculate the position and/or speed of the traverse guide 33 based on the rotation angle of the winding bobbin Bw and the calculation formula during the winding operation. Alternatively, the storage section 19 may store only a table as information on the relationship between the rotation angle of the winding bobbin Bw and the position, speed, and acceleration of the traverse guide 33.

(5) In the embodiments described above, the traverse guide 33 is attached to the endless belt 32, but the present invention is not limited to this. For example, the traverse guide 33 may be attached to the tip end of an arm that is driven to swing (see japanese patent application laid-open No. 2007-153554). Alternatively, the traverse guide 33 may be driven to reciprocate by a linear motor or the like.

(6) In the above-described embodiments, the traverse guide 33 is driven by the driving source configured to be capable of forward and reverse driving, but the present invention is not limited thereto. For example, the rewinding machine 1 may include a cam-type traverse device using a motor that is rotationally driven in one direction as a driving source.

(7) In the embodiments described above, the rotation speed of the winding bobbin Bw is constant, but the present invention is not limited to this. That is, the control device 13 may control the winding motor 22 and the traverse motor 31 so as to keep the winding ratio constant for precise winding, and may change the rotation speed of the winding bobbin Bw during the winding operation.

(8) The present invention is not limited to the rewinder 1, and can be applied to various yarn winding machines.

Description of the symbols

1: rewinding machines (yarn winding machines); 13: a control device (control unit); 19: a storage unit; 22: a winding motor (bobbin driving section); 31: a traverse motor (a yarn guide driving section); 32: an endless belt (belt member); 33: a traverse guide; bw: a winding bobbin (bobbin); pw: winding a package (package); y: a yarn.