阅读说明：本技术 气流纺纱机 (Rotor spinning machine ) 是由 伊藤诚 丰田贵大 于 2021-03-08 设计创作，主要内容包括：本发明的气流纺纱机进行使旋转空气流作用于纤维束而新生成短纤维纱、并将生成的短纤维纱输送至下游侧的自纺纱。气流纺纱机具备牵伸装置、气流纺纱装置、吸管、以及控制装置。牵伸装置牵伸纱条而生成纤维束。气流纺纱装置进行自纺纱。吸管吸引捕捉由气流纺纱装置生成的短纤维纱。控制装置基于作为由气流纺纱装置生成的短纤维纱的行进速度的纱速、和牵伸装置中的牵伸条件的至少任一个,求出吸管的动作时机。(The rotor spinning machine of the present invention performs self-spinning in which a spun yarn is newly generated by applying a whirling airflow to a fiber bundle and the generated spun yarn is transported to the downstream side. The rotor spinning machine is provided with a drafting device, a rotor spinning device, a suction pipe, and a control device. The draft device drafts the sliver to produce a fiber bundle. The open-end spinning device performs self-spinning. The suction pipe sucks and catches the spun yarn produced by the open-end spinning device. The control device determines the operation timing of the suction pipe based on at least one of a yarn speed which is a traveling speed of the spun yarn produced by the air spinning device and a draft condition in the draft device.)

1. A rotor spinning machine for performing self-spinning in which a yarn is newly generated by applying a whirling airflow to a fiber bundle and the generated yarn is transported to the downstream side, comprising:

a draft device that drafts a raw material to generate the fiber bundle;

an air-jet spinning device for performing the self-spinning;

a 1 st yarn suction/catching device for sucking and catching the yarn produced by the air-jet spinning device; and

and a control unit configured to change a cycle time of a cycle including an operation of the 1 st yarn suction capturing device based on at least one of a yarn speed that is a traveling speed of the yarn produced by the air-jet spinning device and a draft condition in the draft device.

2. Rotor spinning machine according to claim 1,

the control unit obtains an operation timing of the 1 st yarn suction capturing device based on at least one of a yarn speed which is a traveling speed of the yarn produced by the air-jet spinning device and a draft condition in the draft device, and changes the cycle time.

3. Rotor spinning machine according to claim 1 or 2,

the control unit obtains a start timing of a suction operation by the 1 st yarn suction/catching device based on at least one of the yarn speed and the draft condition, and changes the cycle time.

4. A rotor spinning machine according to any one of claims 1-3,

the control unit obtains a start timing of movement of the 1 st yarn suction-catching device from a yarn catching position at which the yarn is caught toward a target position as a destination for guiding the caught yarn, based on at least one of the yarn speed and the draft condition, and changes the cycle time.

5. A rotor spinning machine according to any one of claims 1 to 4,

the control unit controls a suction operation of the 1 st yarn suction/capture device and a movement of the yarn captured by the suction operation toward a target position as a destination of guidance.

6. A rotor spinning machine according to any one of claims 1-5,

the draft device includes a 1 st roller provided on an upstream side in a draft direction of the raw material and configured to convey the raw material,

the control unit starts the self-spinning by the air-jet spinning device after a period based on at least one of the yarn speed and the draft condition has elapsed since the rotation of the 1 st roller.

7. Rotor spinning machine according to claim 6,

the air spinning device is provided with a spinning nozzle for passing air injected into a spinning chamber formed inside,

the period from the start of the rotation of the 1 st roller to the start of the air injection operation of the spinning nozzle is determined based on at least one of the yarn speed and the draft condition.

8. A rotor spinning machine according to any one of claims 1 to 7,

the draft conditions include at least any one of a total draft ratio, a main draft ratio, a back zone draft ratio, a feed ratio, and a gauge width.

9. A rotor spinning machine according to any one of claims 1 to 8,

the yarn drafting device is provided with a setting part for setting the yarn speed and/or the drafting condition.

10. A rotor spinning machine according to any one of claims 1 to 9, comprising:

a yarn winding device configured to wind the yarn generated by the air-jet spinning device to form a package;

a 2 nd yarn suction/catching device for sucking and catching the yarn from the yarn winding device; and

a yarn splicing device for performing a yarn splicing operation of splicing the yarns sucked and captured by the 1 st yarn suction and capture device and the 2 nd yarn suction and capture device,

the piecing operation by the piecing device is performed after the self-spinning by the air-jet spinning device is completed.

11. The rotor spinning machine according to claim 10, comprising:

a plurality of spinning units; and

a yarn splicing cart that travels relative to the plurality of spinning units,

the draft device and the air-jet spinning device are provided in each of the spinning units,

the yarn splicing cart is provided with the 1 st yarn suction/catching device, the 2 nd yarn suction/catching device, and the yarn splicing device.

12. A rotor spinning machine according to any one of claims 1 to 11, comprising:

a plurality of spinning units; and

a doffing carriage that travels relative to the plurality of spinning units,

each of the spinning units includes the draft device and the air-jet spinning device, and winds the yarn generated by the air-jet spinning device to form a package,

the doffing carriage doffs the package that has become a full package,

the 1 st yarn suction catching device is provided to the doffing carriage.

Technical Field

The present invention relates to a rotor spinning machine provided with a rotor spinning device.

Background

Conventionally, a rotor spinning machine has been known which sucks and captures a yarn from a rotor spinning device by using a yarn suction and capture device. Japanese patent application laid-open No. 2018-53373 (patent document 1) discloses such a rotor spinning machine.

The spinning machine of patent document 1 includes: a 1 st catching and guiding device for catching the 1 st yarn from the open-end spinning device and guiding the yarn to the piecing device; and a 2 nd catching and guiding device for catching the 2 nd yarn from the winding device and guiding to the jointing device. Thus, the spinning machine can perform the yarn splicing operation of the yarn ends of the cut yarn when the yarn ends are broken or the yarn clearer cuts the yarn. After the 2 nd catching guide reaches the predetermined position, the 1 st catching guide catches the 1 st yarn at the 1 st yarn catching position and moves to the 1 st yarn guiding position.

In the spinning machine of patent document 1, the standby time of the 1 st catching guide device may become long due to the operation time of the 2 nd catching guide device. As a result, the time of the joint cycle until the joint operation is completed becomes long. Further, while the 1 st catching guide device is on standby, the yarn produced in the air-jet spinning device becomes unnecessary, and therefore, the amount of yarn waste increases.

Disclosure of Invention

The invention aims to provide a rotor spinning machine which can make a 1 st yarn suction catching device act at an efficient time, and can improve the action efficiency and reduce the waste yarn.

According to an aspect of the present invention, there is provided a rotor spinning machine of the following construction. That is, the rotor spinning machine performs self-spinning in which a spinning air flow is applied to a fiber bundle to newly generate a yarn and the generated yarn is transported to the downstream side. The rotor spinning machine includes a draft device, a rotor spinning device, a 1 st yarn suction/catching device, and a control unit. The draft device drafts a raw material to generate the fiber bundle. The air-jet spinning device performs the self-spinning. The 1 st yarn suction/catching device sucks and catches the yarn produced by the air-jet spinning device. The control unit changes a cycle time of a cycle including an operation of the 1 st yarn suction capturing device based on at least one of a yarn speed which is a traveling speed of the yarn produced by the air-jet spinning device and a draft condition in the draft device.

Accordingly, the above-described circulation can be appropriately performed according to the yarn speed and/or the draft condition, and the operation efficiency of the 1 st yarn suction catching device can be improved and the amount of waste yarn can be reduced.

In the above-described rotor spinning machine, it is preferable that the control unit obtains the operation timing of the 1 st yarn suction/catching device based on at least one of a yarn speed which is a traveling speed of the yarn produced by the rotor spinning device and a draft condition in the draft device, and changes the cycle time.

Thus, the 1 st yarn suction/catching device can be operated immediately after the 1 st yarn suction/catching device is brought into an operable state (e.g., a state in which the yarn travels to a predetermined position). As a result, the work related to the self-spinning can be smoothly performed without error, and the unnecessary waiting time can be eliminated to improve the operation efficiency. In addition, since the time for the self-spinning is shortened, the amount of waste yarn can be reduced.

In the above-described rotor spinning machine, it is preferable that the control unit obtains a start timing of the suction operation by the 1 st yarn suction catching device based on at least one of the yarn speed and the draft condition, and changes the cycle time.

This enables the 1 st yarn suction/catching device to start the suction operation at an early stage. Therefore, an improvement in running efficiency and a reduction in the amount of waste yarn can be achieved.

In the above rotor spinning machine, it is preferable that the control unit obtains a start timing of movement of the 1 st yarn suction-catching device from a yarn catching position at which the yarn is caught toward a target position as a destination for guiding the caught yarn based on at least one of the yarn speed and the draft condition, and changes the cycle time.

Thus, the yarn can be guided by the 1 st yarn suction/catching device immediately after the 1 st yarn suction/catching device is in a state in which there is a high possibility that the yarn is caught by the 1 st yarn suction/catching device. Therefore, an improvement in running efficiency and a reduction in the amount of waste yarn can be achieved.

In the above-described rotor spinning machine, it is preferable that the control unit controls the suction operation of the 1 st yarn suction/capture device and the movement of the yarn captured by the suction operation toward a target position as a destination to which the yarn is to be guided.

Thus, the start timing of the suction operation by the 1 st yarn suction catcher and the start timing of the movement to the target position can be appropriately controlled, so that the improvement of the running efficiency and the reduction of the yarn waste amount can be realized.

In addition to the above-described rotor spinning machine, the following configuration is preferable. That is, the draft device includes the 1 st roller for conveying the raw material, which is provided on the upstream side in the draft direction of the raw material. The control unit starts the self-spinning by the air-jet spinning device after a period based on at least one of the yarn speed and the draft condition has elapsed since the rotation of the 1 st roller.

Thus, after the draft by the draft device is substantially started and the fiber bundle is guided into the air-jet spinning device, the self-spinning can be started immediately. Therefore, an improvement in running efficiency and a reduction in the amount of waste yarn can be achieved.

The rotor spinning machine described above preferably has the following configuration. That is, the air-jet spinning device includes a spinning nozzle. The air-jet spinning device injects air from the spinning nozzle into a spinning chamber formed inside the air-jet spinning device. The period from the start of the rotation of the 1 st roller to the start of the air injection operation of the spinning nozzle is determined based on at least one of the yarn speed and the draft condition.

Accordingly, since the air jet operation by the spinning nozzle can be started immediately after the fiber bundle reaches the air jet spinning device in a state in which the possibility of the fiber bundle reaching the air jet spinning device is high, the yarn generation can be started smoothly, and the running efficiency can be improved.

The rotor spinning machine described above preferably has the following configuration. That is, the draft conditions include at least any one of a total draft ratio, a main draft ratio, a back zone draft ratio, a feed ratio, and a gauge width.

Thus, the air-jet spinning machine can change the cycle time based on appropriate conditions.

The rotor spinning machine preferably includes a setting unit for setting the yarn speed and/or the draft condition.

This enables the operator to set a desired yarn speed and/or draft condition.

The rotor spinning machine described above preferably has the following configuration. That is, the rotor spinning machine includes a yarn winding device, a 2 nd yarn suction/catching device, and a yarn splicing device. The yarn winding device winds the yarn produced by the air-jet spinning device to form a package. The 2 nd yarn suction/catching device sucks and catches the yarn from the yarn winding device. The yarn splicing device performs a yarn splicing operation of splicing the yarns sucked and captured by the 1 st yarn suction and capture device and the 2 nd yarn suction and capture device. The yarn splicing operation by the yarn splicing device is performed after the self-spinning by the air-jet spinning device is completed.

Thus, the yarn splicing circulation can be smoothly performed without error according to the yarn speed and/or the draft condition, and the circulation time can be shortened.

In addition to the above-described rotor spinning machine, the following configuration is preferable. That is, the air-jet spinning machine includes a plurality of spinning units and a yarn splicing cart. The yarn splicing cart travels relative to the plurality of spinning units. The draft device and the air-jet spinning device are provided in each of the spinning units. The yarn splicing cart is provided with the 1 st yarn suction/catching device, the 2 nd yarn suction/catching device, and the yarn splicing device.

That is, the above-described configuration capable of shortening the cycle time at the time of piecing is particularly advantageous in the case where the piecing carriage is used in common for a plurality of spinning units. After the operation of one spinning unit is completed, the yarn splicing cart can start the operation of the other spinning unit at a timing earlier than before.

In addition to the above-described rotor spinning machine, the following configuration is preferable. That is, the rotor spinning machine includes a plurality of spinning units and a doffing cart. The doffing carriage travels relative to the plurality of spinning units. The draft device and the air-jet spinning device are provided in each of the spinning units. Each of the spinning units winds the yarn produced by the air-jet spinning device to form a package. The doffing carriage doffs the package that has become full-wound. The 1 st yarn suction/catching device is provided on the doffing carriage.

This can shorten the cycle time during doffing. This has the effect of being particularly advantageous in a configuration in which a plurality of spinning units commonly use a doffing carriage. When the operation of one spinning unit is completed, the doffing carriage can start the operation of the other spinning unit at a timing earlier than before.

Drawings

Fig. 1 is a front view showing an overall configuration of a spinning machine according to an embodiment of the present invention.

Fig. 2 is a side view showing the spinning unit, the yarn splicing cart, and the doffing cart.

Fig. 3 is a sectional view showing the internal structure of the air-jet spinning device.

FIG. 4 is a timing chart showing the operation of the 1 st nozzle, pipette, and the like in the case of the adapter.

Detailed Description

Next, a spinning machine (air-jet spinning machine) 100 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, "upstream" and "downstream" refer to upstream and downstream in the traveling direction of the sliver (raw material) S, the tow F, and the spun yarn Y at the time of winding of the spun yarn (yarn) Y.

The spinning machine 100 shown in fig. 1 includes a prime mover casing 80, a spinning unit 1, a yarn splicing cart 6, and a doffing cart 7. The spinning units 1 are arranged in a row and provided in plurality.

Although not shown, the spinning machine 100 includes a blower case. A negative pressure source that generates negative pressure is provided inside the blower case. The negative pressure generated by the negative pressure source is supplied to each spinning unit 1, the yarn splicing cart 6, and the doffing cart 7 via an air duct or the like not shown in the figure.

The prime mover enclosure 80 is provided with a management device 9. The management device 9 can communicate with a unit control unit 50, which will be described later, provided in each spinning unit 1. The unit control section 50 may be provided with 1 spinning unit 1 for each predetermined number of spinning units 1.

The management device 9 can communicate with carriage control units (not shown) provided in the splicing carriage 6 and the doffing carriage 7. The management device 9 communicates with the unit control unit 50 and the carriage control unit, and can collectively manage information on the spinning units 1, the yarn splicing carriages 6, the doffing carriages 7, and the like.

As shown in fig. 1, the management device 9 includes a display 91, an input device 92, and a control device (control unit) 90.

The display 91 displays information such as the operation state, yarn quality, and spinning conditions of each spinning unit 1. The input device 92 includes a plurality of input keys that can be operated by an operator. The input device 92 is used for selection of information displayed on the display 91, setting of spinning conditions of the spinning machine 100, and the like. The display 91 and the input device 92 may be integrally formed by a touch panel display.

The spinning conditions of the spinning machine 100 include, for example, a yarn speed as a traveling speed of the spun yarn Y generated by the air-jet spinning device 3, draft conditions of a draft device 2 described later provided in the spinning unit 1, and the like. In the present embodiment, the yarn speed is the traveling speed of the spun yarn Y between the air-jet spinning device 3 and a yarn drawing device (yarn accumulating roller 11a, or a nip roller and delivery roller) to be described later. The spinning conditions may be automatically set according to the type of yarn selected by the operator, or may be manually set by the operator.

The control device 90 is configured as a known computer. The control device 90 includes a cpu (central Processing unit), a rom (read Only memory), a ram (random Access memory), an hdd (hard Disk drive), and the like, which are not shown.

The control device 90 determines the operation timing of each part of the spinning unit 1, the yarn splicing cart 6, and the doffing cart 7 based on the set spinning conditions. The control device 90 transmits the determined operation timing of each unit of the spinning unit 1 to each unit control unit 50 that controls each spinning unit 1. The control device 90 transmits the operation timing of each part to each carriage control part that controls the splicing carriage 6 and the doffing carriage 7. The operation timing of each part will be described later in detail.

As shown in fig. 1 and 2, each spinning unit 1 mainly includes a draft device 2, an air-jet spinning device 3, a yarn winding device 4, and a unit control unit 50. In the spinning unit 1, the draft device 2, the air-jet spinning device 3, and the yarn winding device 4 are arranged in order from upstream to downstream.

The draft device 2 is provided near the upper end of the frame 10 provided in the spinning machine 100. As shown in fig. 2, the draft device 2 includes 4 draft rollers. The 4 draft rollers are composed of a back roller (1 st roller) 21, a third roller 22, a middle roller 23, and a front roller 24. In the draft device 2, the rear roller 21, the third roller 22, the middle roller 23, and the front roller 24 are arranged in order from the upstream side. The draft device 2 further includes 4 counter rollers provided to face each of the 4 draft rollers. A rubber tangential belt 25 is wound around each of the middle roller 23 and the opposite roller.

The draft device 2 pinches and conveys the sliver S supplied from the sliver cassette, which is not shown, between the draft rollers and the counter rollers, and elongates (drafts) the sliver S to a predetermined fiber amount (or thickness) to generate the fiber bundle F. The fiber bundle F generated in the draft device 2 is supplied to the air-jet spinning device 3, and is spun in the air-jet spinning device 3. As a result, a spun yarn Y is produced.

In the present embodiment, each draft roller provided in the draft device 2 is driven by an independent electric motor (not shown). Thereby, the rotational speed of each draft roller can be independently changed. The operation of each electric motor for driving each draft roller is controlled by the unit control section 50. The middle roller 23 may be configured to be driven in parallel in a plurality of spinning units 1. The front roller 24 may be configured to be driven in parallel in a plurality of spinning units 1.

In the draft device 2, the rotational speed of each draft roller is set to be higher toward the downstream side. As a result, the fiber bundle F is conveyed and drafted between the draft roller and the counter roller, and the thickness of the fiber bundle F becomes thinner toward the downstream side. The rotational speed of each draft roller is set based on the yarn speed input by the operator via the input device 92 and draft conditions described later.

The ratio at which the fiber bundle F is stretched can be changed by appropriately setting the rotational speed of each draft roller. This makes it possible to supply the fiber bundle F drafted to a desired thickness to the air-jet spinning device 3. Hereinafter, this ratio of elongation is referred to as "draft ratio".

Here, draft conditions of the draft device 2 including the draft ratio will be briefly described. Draft conditions include, for example, Total Draft Ratio (TDR), Main Draft Ratio (MDR), back zone draft ratio (BDR), feed ratio, and gauge width, among others. Various draft conditions are set according to the type, thickness, and the like of the spun yarn Y produced by the spinning machine 100.

The total draft ratio is the ratio of the peripheral speed of the front roller 24 to the peripheral speed of the back roller 21. That is, the total draft ratio is (the circumferential speed of the front roller 24)/(the circumferential speed of the rear roller 21).

The main draft ratio is the ratio of the peripheral speed of the front roller 24 to the peripheral speed of the middle roller 23. That is, the main draft ratio is (circumferential speed of the front roller 24)/(circumferential speed of the middle roller 23).

The back draft ratio is the ratio of the peripheral speed of the third roller 22 to the peripheral speed of the back roller 21. That is, the back draft ratio is (peripheral speed of the third roller 22)/(peripheral speed of the back roller 21).

The draft ratio (or the thickness of the generated fiber bundle F or spun yarn Y) can be changed by adjusting the rotational speed (peripheral speed) of each draft roller. The draft ratios are not limited to the above-described determination, and may be determined based on the amount or number of fibers introduced between each draft roller and the counter roller.

The gauge width is a distance between 2 draft rollers adjacent to each other in the traveling direction of the fiber bundle F (specifically, for example, a distance between axes of the adjacent 2 draft rollers). By adjusting the gauge width, the conveying distance of the fiber bundle F conveyed by the draft roller can be changed.

The feed ratio is a ratio of the peripheral speed of the front roller 24 to the peripheral speed of the yarn accumulating roller 11a described later. That is, the feed ratio is (peripheral speed of the front roller 24)/(peripheral speed of the yarn accumulating roller 11 a).

The air spinning device 3 is provided immediately downstream of the front roller 24. The air-jet spinning device 3 twists the fiber bundle F supplied from the draft device 2 by a whirling air flow to produce a spun yarn Y.

As shown in fig. 3, the air-jet spinning device 3 includes a nozzle block 30 and a hollow guide shaft 34. The nozzle block 30 includes a fiber guide 31, a spinning chamber 32, and a 1 st nozzle (spinning nozzle) 33. The hollow guide shaft body 34 includes a yarn passage 35 and a 2 nd nozzle 36. Each part of the air-jet spinning device 3 is controlled by the unit control unit 50. In fig. 3, the nozzle block 30 is illustrated as being constituted by a plurality of members, but may be constituted by 1 member.

The fiber guide 31 is a member that guides the fiber bundle F drafted by the draft device 2 toward the inside (the spinning chamber 32) of the air-jet spinning device 3. The air-jet spinning device 3 injects air from the 1 st nozzle 33 into the spinning chamber 32, and causes a whirling air flow to act on the fiber bundle F in the spinning chamber 32.

The hollow guide shaft body 34 is a cylindrical member, and a yarn passage 35 is formed inside thereof. The air-jet spinning device 3 injects air from the 2 nd nozzle 36 into the yarn passage 35, thereby generating a whirling air flow in the yarn passage 35. The whirling airflow generated in the yarn passage 35 is in the opposite direction to the whirling airflow of the spinning chamber 32.

The air-jet spinning device 3 configured as described above can perform discharge spinning (self-spinning) and normal spinning. The discharge spinning is a spinning operation in which a rotational air flow is applied to the fiber bundle F to newly generate the spun yarn Y in the air-jet spinning device 3 alone, and the generated spun yarn Y is fed to the downstream side. The normal spinning is a spinning operation in which the spun yarn Y wound by the yarn winding device 4 is continuously generated after the yarn is discharged and spun.

The discharge spinning is a transient and temporary spinning performed when the air-jet spinning device 3 starts or restarts the generation of the spun yarn Y, unlike the normal spinning. In the case of performing the discharge spinning, the air-jet spinning device 3 does not eject air from the 1 st nozzle 33 in the initial stage, but ejects air from the 2 nd nozzle 36 to generate a whirling air flow in the yarn passage 35. The fiber bundle F supplied from the draft device 2 is guided into the air-jet spinning device 3 by the fiber guide portion 31. The fiber bundle F is conveyed toward the hollow guide shaft 34.

Since the yarn passage 35 is formed such that the downstream-side cross-sectional area is larger than the upstream-side cross-sectional area, the swirling air flow flows toward the downstream side in the yarn passage 35. This enables the fiber bundle F to be fed downstream of the yarn passage 35. After that, air is ejected from the 1 st nozzle 33 on the basis of the 2 nd nozzle 36. The fiber bundle F is spun into a finished fiber shape by the air ejected from the 1 st nozzle 33 and the air ejected from the 2 nd nozzle 36, and is discharged from the hollow guide shaft 34. In the discharge spinning, there is almost no tension for drawing the spun yarn Y from the downstream side of the air-jet spinning device 3, and even if there is a tension, it is only a weak tension by the suction air flow of the suction pipe 63 described later.

In the discharge spinning, in order to reliably send out the fiber bundle F (or the spun yarn Y) in the yarn passage 35 to the downstream side by the whirling airflow generated by ejecting air from the 2 nd nozzle 36, it is necessary to supply an appropriate amount of the fiber bundle F to the air-jet spinning device 3. Therefore, in the discharge spinning, a spun yarn Y having a different thickness (discharge thickness) from that of a spun yarn Y in a normal spinning is produced. In the following description, the spun yarn Y produced by the spun yarn discharge is referred to as "spun yarn discharge.

In the discharge spinning, the draft rollers such as the back roller 21 are rotationally driven at respective rotational speeds (hereinafter, sometimes referred to as "starting rotational speed") corresponding to the discharge yarn thickness. Thus, during the discharge spinning, the fiber bundle F of a constant thickness is supplied to the air-jet spinning device 3, and a discharge spun yarn is produced. After the completion of the spun yarn, the rotational speed of each draft roller is adjusted so as to set the thickness of the spun yarn Y in a normal spinning. As a result, normal spinning is started. In the following description, the spun yarn Y produced by the normal spinning is referred to as "normal yarn".

How different the thickness of the yarn is made in the drawn staple yarn and the normal yarn can be set by the start-up ratio. The start-up ratio is a ratio of the peripheral speed of the rear roller 21 when the open-end spinning device 3 performs the spun yarn and the peripheral speed of the rear roller 21 during normal spinning. The start-up rate is the same as the draft condition, and the operator can input the start-up rate to the management device 9 using the input device 92.

In the present embodiment, the activation rate is expressed as a percentage. That is, the start-up ratio (%) is { (the peripheral speed of the rear roller 21 at the time of yarn discharge spinning)/(the peripheral speed of the rear roller 21 at the time of normal spinning) } × 100.

In normal spinning, air is ejected from the 1 st nozzle 33, and air is not ejected from the 2 nd nozzle 36. In this state, the rear end of the fiber bundle F supplied from the draft device 2 is swung around the front end of the hollow guide shaft 34 by the whirling air flow in the spinning chamber 32 generated by the 1 st nozzle 33. Thereby, the fiber bundle F is twisted to produce the spun yarn Y. The spun yarn Y passes through a yarn passage 35 of the hollow guide shaft 34, and is sent out to the outside of the air-jet spinning device 3 from a downstream yarn outlet (not shown).

The spun yarn Y wound in the package 45 is a normal yarn. The spun staple yarn is produced transitionally under conditions different from those of ordinary yarns, and is finally discarded as waste yarn. Therefore, from the viewpoint of reducing waste yarn, it is preferable to shorten the time for performing the yarn-discharging spinning.

The yarn winding device 4 includes a cradle arm 41, a winding drum 42, and a traverse guide 43. The cradle arm 41 is supported to be swingable about a support shaft 44, and rotatably supports the spool 15 (i.e., the package 45) for winding the spun yarn Y. The winding drum 42 rotates in contact with the outer peripheral surface of the spool 15 or the outer peripheral surface of the package 45, thereby rotationally driving the package 45 in the winding direction. The yarn winding device 4 reciprocates the traverse guide 43 by an unillustrated driving means, and drives the winding drum 42 by an unillustrated electric motor. Thereby, the yarn winding device 4 winds the spun yarn Y into the package 45 while winding the spun yarn Y.

In each spinning unit 1, a yarn accumulating device 11 and a yarn monitoring device 12 are provided between the air-jet spinning device 3 and the yarn winding device 4.

The yarn accumulating device 11 is provided downstream of the air spinning device 3. As shown in fig. 2, the yarn accumulating device 11 includes a yarn accumulating roller 11a, a motor 11b for rotationally driving the yarn accumulating roller 11a, a yarn guide hook member 11c, and a yarn tail removing rod (yarn retracting member) 11 d.

The yarn accumulating roller 11a temporarily accumulates a predetermined amount of the spun yarn Y while winding it around the outer peripheral surface thereof. The yarn accumulating roller 11a is rotated at a predetermined rotational speed in a state where the spun yarn Y is wound around the outer peripheral surface, and draws out the spun yarn Y from the air-jet spinning device 3 at a predetermined speed and conveys the spun yarn Y to the downstream side.

A remaining yarn removing device, which is not shown in the drawing, is provided near the yarn accumulating roller 11 a. The yarn residue removing device includes a tubular front end portion. When a broken end occurs for some reason at the time of winding the spun yarn Y and the spun yarn Y remains in the yarn accumulating roller 11a, the remaining yarn removing device can suck and remove the remaining yarn wound around the yarn accumulating roller 11a by the suction air flow generated at the leading end portion and the inside thereof.

The yarn hooking member 11c is attached to the downstream end of the yarn accumulating roller 11 a. The yarn hooking member 11c is supported to be rotatable with respect to the yarn accumulating roller 11 a. The yarn guide hook member 11c rotates integrally with the yarn accumulating roller 11a in a state where the spun yarn Y is hooked, and guides the spun yarn Y to the outer peripheral surface of the yarn accumulating roller 11 a.

The yarn tail removing rod 11d is provided in the vicinity of the downstream end of the yarn accumulating roller 11 a. The yarn tail removing lever 11d is configured to be vertically swingable about a swing shaft 11e between an operating position and a standby position. When the yarn tail removing lever 11d is located at the standby position shown in fig. 2, it does not contact the yarn path of the spun yarn Y (i.e., the traveling spun yarn Y). On the other hand, when the yarn tail removing lever 11d is raised from the state of fig. 2 and is located at an operation position not shown in the figure, the short fiber yarn Y is pushed up and can be retracted (removed) from the yarn guide hook member 11 c.

The yarn tail removing lever 11d is urged by, for example, an unillustrated spring member, and is always held at the standby position when the spun yarn Y is wound. The spring member may be omitted, and the yarn tail removing lever 11d may be configured to stand by its own weight in the standby position. The yarn tail removing lever 11d can be moved to the operating position by being pushed up by a push-up arm, not shown, provided in the splicing cart 6, for example. The push-up arm can be driven by an actuator such as an air cylinder.

The staple yarn Y can be removed from the yarn guide hook member 11c by moving the yarn tail removal lever 11d to the operating position. As a result, the spun yarn Y can be unwound from the yarn accumulating roller 11 a. The unwound spun yarn Y is sucked by a suction pipe 63 described later, for example.

Further, when the yarn tail removing rod 11d is raised in a state where the spun yarn Y is not wound around the yarn accumulating roller 11a, the hooking of the yarn hooking member 11c to the spun yarn Y can be prevented, and therefore the spun yarn Y can be prevented from being wound around the yarn accumulating roller 11 a.

The yarn monitoring device 12 is provided between the air-jet spinning device 3 and the yarn accumulating device 11. The spun yarn Y produced in the air spinning device 3 passes through the yarn monitoring device 12 before being wound up in the yarn accumulating device 11.

The yarn monitoring device 12 monitors the quality (thickness, etc.) of the traveling spun yarn Y by means of a light-transmitting sensor, and detects yarn defects (e.g., a portion where the thickness, etc. of the spun yarn Y is abnormal, and/or foreign matter, etc.) included in the spun yarn Y. The yarn monitoring device 12 is not limited to the light-transmitting sensor, and for example, a capacitance sensor may be used to monitor the spun yarn Y. The yarn monitoring device 12 may be configured to detect the tension of the spun yarn Y.

When a yarn defect is detected by the yarn monitoring device 12, the spun yarn Y is cut (clearer cut). The method of cutting the spun yarn Y is various, and for example, the spun yarn Y can be cut by stopping the spinning in the air-jet spinning device 3. The spinning unit 1 may be provided with a cutter, and the spun yarn Y may be cut by the cutter.

The unit control unit 50 is configured as a known computer, similar to the control device 90. The unit control unit 50 includes a CPU, ROM, RAM, HDD, and the like, which are not shown.

The unit control section 50 is provided in each spinning unit 1 and configured to be capable of communicating with the control device 90. The unit control unit 50 controls the operation of each unit of the spinning unit 1 based on the control information such as the operation timing described above received from the control device 90.

As shown in fig. 1, the joint carriage 6 includes a movable wheel 61, a joint device 62, a suction pipe 63, and a suction port 64.

The traveling wheel 61 is configured to be rotatably driven by a motor not shown in the drawings. The traveling wheels 61 are driven to allow the yarn splicing cart 6 to travel relative to the plurality of spinning units 1.

The suction pipe (1 st yarn suction catching device) 63 is connected to the negative pressure source. The suction pipe 63 can suck and catch the spun yarn Y fed from the air-jet spinning device 3 by the suction airflow generated inside thereof.

A switching valve, not shown, is provided between the suction pipe 63 and the negative pressure source. This can switch between the generation and stop of the suction airflow in the suction pipe 63. The switching valve is opened and closed by, for example, a carriage control unit of the joint carriage 6.

An auxiliary suction device, not shown, is provided at the tip of the suction pipe 63. The auxiliary suction device can generate a strong suction air flow by, for example, jetting compressed air. Thereby, the suction pipe 63 can reliably catch the spun yarn Y. The auxiliary suction device may be omitted.

The suction port (2 nd yarn suction catcher) 64 is connected to the negative pressure source. The suction port 64 generates a suction airflow at its tip, and thereby can suck and catch the spun yarn Y from the package 45 supported by the yarn winding device 4.

The suction pipe 63 and the suction port 64 are rotated in a state of catching the spun yarn Y, and the spun yarn Y is guided to a position where it can be introduced into the yarn splicing device 62.

The yarn splicing cart 6 includes a yarn detection sensor for detecting the spun yarn Y sucked and captured by the suction pipe 63. The yarn detection sensor is constituted by, for example, an optical sensor. The yarn detection sensor is disposed such that its detection light is blocked by the spun yarn Y sucked and captured by the suction pipe 63. The yarn splicing cart 6 is provided with a yarn detection sensor for detecting the spun yarn Y sucked and captured by the suction port 64.

The detection result detected by the yarn detection sensor is transmitted to the control device 90 via the carriage control unit. The control device 90 determines whether the staple yarn Y is successfully captured by the suction pipe 63 and the suction port 64 based on the detection result detected by the yarn detection sensor. The determination may be performed by the unit control unit 50 or the carriage control unit. The yarn detection sensor may not be provided.

The yarn splicing device 62 performs a yarn splicing operation of splicing the spun yarn Y from the air-jet spinning device 3 guided by the suction pipe 63 and the spun yarn Y from the package 45 guided by the suction port 64. In the present embodiment, the splicer device 62 is a splicer device that twists and folds the yarn ends with each other by a rotating air flow. The piecing device 62 is not limited to the splicer device described above, and for example, a knotter or the like that mechanically splices the spun yarn Y may be used.

Waste yarn generated due to the generation of yarn ends for piecing at the piecing device 62 is sucked and removed by the suction pipe 63 and the suction port 64. The waste yarn includes a spun staple yarn produced by the spun yarn of the open-end spinning device 3.

The doffing carriage 7 performs a doffing operation for the package 45 that has become full and a bobbin mounting operation for supplying the empty bobbin 15. As shown in fig. 1 or 2, the doffing carriage 7 includes an empty bobbin accommodating section 71, a cradle operation arm 72, a yarn drawing arm (1 st yarn suction catching device) 73, and an empty bobbin supply arm 74.

The empty bobbin accommodating portion 71 accommodates a plurality of empty bobbins 15. The doffing carriage 7 may be configured not to include the empty bobbin accommodating portion 71 and to receive the empty bobbin 15 conveyed by a conveyor or the like as needed.

The cradle operation arm 72 is configured to be extendable and retractable by an air cylinder not shown in the drawings.

A catching portion is provided at the tip of the yarn drawing arm 73. The catching section can generate a suction air flow to suck and catch the spun yarn Y. A cutter, not shown, for sucking the captured spun yarn Y by the cutting and capturing section is provided at the tip of the yarn drawing arm 73.

The doffing operation will be briefly described below. When the package 45 wound by a certain spinning unit 1 is fully wound (in a state in which a predetermined amount of the spun yarn Y is wound), the doffing carriage 7 travels to the spinning unit 1 along the doffing carriage moving guide 14. The doffing carriage 7 operates the cradle arm 41 of the yarn winding device 4 using the cradle operation arm 72, and removes the fully wound package 45 from the cradle arm 41.

A package conveyor 16 is laid between the spinning unit 1 and the doffing carriage moving guide 14. The doffing carriage 7 uses a package conveying mechanism, not shown, to convey the removed full package 45 onto the package conveyor 16. In fig. 2, the package conveyor 16 is provided between the doffing carriage moving guide 14 and the spinning unit 1 when viewed from the side of the spinning unit 1. However, the spinning machine 100 is not limited to this layout, and for example, the package conveyor 16 may be provided on the opposite side of the spinning unit 1 via the doffing carriage moving guide 14. In other words, the doffing carriage moving guide 14 may be provided between the package conveyor 16 and the spinning unit 1.

The package conveyor 16 can convey the full package 45 to the collection place along the direction in which the spinning units 1 are arranged.

Next, the bobbin mounting operation of the doffing carriage 7 will be briefly described. The doffing carriage 7 grips the empty bobbin 15 stored in the empty bobbin storage portion 71 by the empty bobbin supply arm 74. The doffing carriage 7 rotates the empty bobbin supply arm 74, and conveys the bobbin 15 to the vicinity of the swing arm 41 of the yarn winding device 4. At the same time or at the same timing as the operation of the empty bobbin supply arm 74, the yarn drawing arm 73 of the doffing carriage 7 sucks and captures the spun yarn Y spun by the spun yarn from the air spinning device 3, and guides the captured spun yarn Y to the vicinity of the empty bobbin 15. Then, the doffing carriage 7 guides the empty bobbin 15 and the spun yarn Y to the yarn winding device 4. Next, the spun yarn Y (normal yarn by normal spinning) drawn out from the air-jet spinning device 3 is fixed to the bobbin 15 by a known method such as a package yarn winding method. The spun staple yarn is cut from the normal yarn by a cutter provided in a catching portion at the tip of the yarn drawing arm 73, and is sucked and removed by the yarn drawing arm 73. After the bobbin mounting operation is completed, the rotation of the bobbin 15 is started, and the winding of the spun yarn Y on the new bobbin 15 is started.

Next, in the spinning unit 1 of the spinning machine 100 of the present embodiment, the operation timing of each part at the time of the yarn discharge spinning of the air-jet spinning device 3 will be described in detail. Hereinafter, a spun yarn at the time of piecing will be described as an example.

A case is considered in which spinning by the air-jet spinning device 3 is stopped in the middle of winding the spun yarn Y in a certain spinning unit 1, and the spun yarn Y is cut. The phenomenon that causes the spinning stop includes the detection of a yarn defect by the yarn monitoring device 12, but is not limited to this example. When the spinning is stopped, the yarn splicing cart 6 moves to the spinning unit 1 and performs yarn splicing operation.

Before starting the yarn splicing operation by the yarn splicing cart 6, a preparatory operation for yarn splicing (for example, a cleaning operation of the air-jet spinning device 3, a residual yarn removing operation of the yarn accumulating roller 11a, and the like) is performed in the spinning unit 1.

After the preparatory operation in the spinning unit 1 is completed, the yarn joining carriage 6 generates a suction air flow in the suction pipe 63 and moves the suction pipe 63 to the upper yarn suction position (yarn catching position). The upper yarn suction position is a position at which the suction pipe 63 can suck the upper yarn of the spun yarn Y produced by spinning the fiber bundle F by the air-jet spinning device 3. At the same time or at the same timing, the yarn joining carriage 6 moves the suction port 64 to the lower yarn suction position. The lower yarn suction position is a position at which the suction port 64 can suck the lower yarn, which is the spun yarn Y unwound from the package 45. The upper yarn suction position and the lower yarn suction position are shown by a chain line in fig. 2.

At the same time as or after the suction pipe 63 and the suction port 64 start operating, the unit control section 50 starts the rotation of the draft rollers in the draft device 2 and operates the 2 nd nozzle 36 to jet air to the yarn passage 35 of the air-jet spinning device 3. In the present embodiment, the start of rotation of the draft rollers and the operation of the 2 nd nozzle 36 are performed simultaneously. In this way, the air-jet spinning device 3 operates the 2 nd nozzle 36 earlier than the 1 st nozzle 33 during the discharge spinning, and forms an air flow for conveying the fiber bundle F or the spun yarn Y to the downstream side in the yarn passage 35 in advance. This allows the fiber bundle F or the spun yarn Y supplied from the draft device 2 to easily pass through the yarn passage 35.

As shown in fig. 4, the unit control portion 50 operates the 1 st nozzle 33 to inject air into the spinning chamber 32 of the air-jet spinning device 3 at a timing when a predetermined period (set period) T1 has elapsed since the start of the rotation of the back roller 21 (and the injection operation of the 2 nd nozzle 36). The fiber bundle F is hardly twisted in the swirling air flow jetted from the 2 nd nozzle 36, but the swirling air flow from the 1 st nozzle 33 acts to substantially twist the fiber bundle F, and a spun staple yarn having a certain degree of yarn strength is produced. Therefore, the start timing of the injection operation of the 1 st nozzle 33 can be the start timing of the discharge spinning.

In the spinning machine 100 of the present embodiment, the predetermined period T1 is determined based on the yarn speed and the draft condition input by the operator via the input device 92. Specifically, the traveling speed of the fiber bundle F in the draft device 2 (between the draft rollers) during the discharge spinning can be determined based on the yarn speed, the draft ratio, the feed ratio, and the start-up ratio during the discharge spinning during the normal spinning. Based on the calculation result and the gauge width, the time from the start of rotation of each draft roller in the draft device 2 for the discharge spinning to the arrival of the fiber bundle F at the air-jet spinning device 3 can be calculated.

In the present embodiment, the rotation and stop of the 4 draft rollers are all performed simultaneously, but the rotation and stop timing of the back roller 21 is adopted as a reference of the control timing. Fig. 4 represents 4 draft rollers, and shows the rotation start timing of the back roller 21.

In the case of a configuration in which the front roller 24 and the middle roller 23 are driven in unison by a plurality of spinning units 1, even if spinning is interrupted by a certain spinning unit 1, the rotation of the front roller 24 and the middle roller 23 continues.

In the present embodiment, the control device 90 determines, as the predetermined period T1, the time required for the fiber bundle F (spun yarn Y) to pass through the yarn path 35 of the air spinning device 3 and be discharged from the downstream yarn outlet after the rotation of the rear roller 21 is started. This ensures that the fiber bundle F has passed through the yarn path 35 of the air-jet spinning device 3 at the time when the ejection operation by the 1 st nozzle 33 is started, and the yarn discharge spinning can be smoothly started.

The period from the start of rotation of the back roller 21 to the time when the fiber bundle F passes through the yarn passage 35 differs depending on the yarn speed and draft conditions. In this regard, in the present embodiment, by calculating the predetermined period T1 as described above, regardless of the setting of the yarn speed and the draft condition, the discharge spinning can be started and the injection operation of the 1 st nozzle 33 can be started immediately. As a result, the time of the piecing cycle (cycle) from the occurrence of the yarn breakage and/or the cutting by the clearer to the completion of the piecing can be shortened.

The injection operation by the 2 nd nozzle 36 is stopped at a timing when a predetermined period T2 has elapsed since the start of the injection operation by the 1 st nozzle 33. The predetermined period T2 may be set appropriately based on, for example, the running condition of the spun yarn Y produced by the air-jet spinning device 3, the yarn speed, or the like, or may be set to a fixed value in consideration of a certain margin.

At the timing when the rotation of the back roller 21 is started, the suction pipe 63 is located at the upper yarn suction position shown by the chain line in fig. 2. The auxiliary suction device provided in the suction pipe 63 continuously generates a suction air flow after the rotation of the back roller 21 is started. Therefore, the spun yarn Y produced by the air-jet spinning device 3 can be easily guided to the tip of the suction pipe 63 and captured by the suction pipe 63.

At a timing when the predetermined period T3 has elapsed since the ejection operation by the 2 nd nozzle 36 was stopped, the switching valve described above is opened, and the suction operation of the suction pipe 63 is started. The predetermined period T3 is set as appropriate based on, for example, a previously performed experiment.

At a timing when a predetermined period T4 has elapsed since the suction operation by the suction pipe 63 was started, the carriage control unit of the joint carriage 6 starts the movement (lowering) of the tip end portion of the suction pipe 63. Thereby, the suction pipe 63 is moved from the upper yarn suction position to the upper yarn guide position (target position) shown by the solid line in fig. 2. The motor, not shown, for moving the suction pipe 63 may be directly controlled by the control device 90 instead of the carriage control unit. The predetermined period T4 is set in advance as appropriate in the same manner as the predetermined period T3.

Simultaneously with the start of the movement of the suction pipe 63 toward the joint device 62, the yarn tail removal lever 11d moves from the standby position to the operating position. That is, the yarn removing operation by the yarn tail removing lever 11d is started. Thereby, the upper yarn (the spun staple yarn) guided by the suction pipe 63 is guided to the yarn splicing device 62 without being accumulated in the yarn accumulating roller 11 a. The start of the yarn removing operation by the yarn tail removing lever 11d may be earlier than the start of the movement of the suction pipe 63 to the joint device 62, or may be a predetermined time after the start of the movement.

In the present embodiment, when the air-jet spinning device 3 starts or restarts the generation of the spun yarn Y, the length of the predetermined period T1 is changed to various lengths according to the set yarn speed and draft conditions. As a result, the timing of the termination period of the joint cycle changes to various timings.

If the length of the predetermined period T1 is fixed, the predetermined period T1 must be made long, and for example, the self-spun yarn and the spun yarn Y are guided without any problem even when the yarn speed is slow. On the other hand, in the present embodiment, the predetermined period T1 can be made short according to the set yarn speed and draft conditions, and the operations of the respective parts can be coordinated at a compact timing. This makes it possible to smoothly perform the discharge spinning and the switching from the discharge spinning to the normal spinning without any error, and effectively shorten a series of operation time depending on the situation. Therefore, the operation efficiency of the spinning machine 100 can be improved, and the amount of waste yarn can be reduced.

Even in the case of the yarn discharge spinning during the bobbin mounting operation of the doffing carriage 7, the operation timing of each part can be determined substantially in the same manner as described above. In this case, the yarn drawing arm 73 of the doffing carriage 7 corresponds to the suction pipe 63 of the yarn splicing carriage 6. By this control, the time for discharging the yarn can be shortened to improve the running efficiency, and the amount of waste yarn can be reduced.

As described above, the spinning machine 100 of the present embodiment performs the spun yarn spinning in which the spun yarn Y is newly generated by applying the whirling airflow to the fiber bundle F and the generated spun yarn Y is conveyed to the downstream side. The spinning machine 100 includes a draft device 2, an air-jet spinning device 3, a suction pipe 63, and a control device 90. The draft device 2 drafts the sliver S to generate a fiber bundle F. The open-end spinning device 3 performs discharge spinning. The suction pipe 63 sucks and catches the spun yarn Y produced by the air-jet spinning device 3. The control device 90 can change the cycle time of the cycle including the operation of the suction pipe 63 based on at least one of the yarn speed, which is the traveling speed of the spun yarn Y produced by the air-jet spinning device 3, and the draft condition in the draft device 2.

Accordingly, the above-described circulation can be appropriately performed according to the yarn speed and/or the draft condition, and the operation efficiency of the suction pipe 63 can be improved and the amount of waste yarn can be reduced.

In the above embodiment, the above-described cycle is described as a piecing cycle from the occurrence of a cut and/or a cut by a clearer to the completion of piecing. However, the above-described cycle may be a cycle from the start of the operation for the joint by the apparatus associated with the joint including the suction pipe 63 to the completion of the joint itself.

In the spinning machine 100 of the present embodiment, the control device 90 preferably determines the operation timing of the suction pipe 63 (specifically, the timing corresponding to the end of the predetermined period T4 in fig. 4) based on at least one of the yarn speed, which is the traveling speed of the spun yarn Y produced by the air-jet spinning device 3, and the draft condition in the draft device, and changes the cycle time.

Thus, the suction pipe 63 can be operated immediately after the suction pipe 63 is in an operable state (e.g., a state in which the spun yarn Y has moved to a predetermined position). As a result, the work related to the yarn discharge spinning can be smoothly performed without any error, and the unnecessary waiting time can be eliminated to improve the running efficiency. In addition, since the time for discharging the yarn is shortened, the amount of waste yarn can be reduced. In the present embodiment, the yarn speed refers to the traveling speed of the spun yarn Y coming out of the air-jet spinning device 3.

In the spinning machine 100 of the present embodiment, the control device 90 determines the start timing of the suction operation by the suction pipe 63 (timing corresponding to the end period of the predetermined period T3 in fig. 4) based on the yarn speed and the draft condition.

This enables the suction operation by the suction pipe 63 to be started early. Therefore, an improvement in running efficiency and a reduction in the amount of waste yarn can be achieved.

In the spinning machine 100 of the present embodiment, the control device 90 determines the start timing of the movement of the suction pipe 63 from the yarn feeding suction position for catching the spun yarn Y to the yarn feeding guide position as the destination for guiding the caught spun yarn Y based on the yarn speed and the draft condition. Specifically, the timing of the end period of the predetermined period T4 in fig. 4 corresponds to the start timing of the movement of the suction pipe 63 from the upper yarn suction position to the upper yarn guide position.

Thus, the guiding of the spun yarn Y by the suction pipe 63 can be started immediately after the spun yarn Y is highly likely to be caught by the suction pipe 63. Therefore, an improvement in running efficiency and a reduction in the amount of waste yarn can be achieved.

In the spinning machine 100 of the present embodiment, the control device 90 controls the suction operation of the suction pipe 63 and the movement of the spun yarn Y captured by the suction operation toward the upper yarn guide position as the destination for guiding the yarn, based on the obtained operation timing.

Accordingly, the suction operation by the suction pipe 63 and the start timing of the movement to the upper yarn guide position can be appropriately controlled, so that the running efficiency can be improved and the amount of waste yarn can be reduced.

In the spinning machine 100 of the present embodiment, the draft device 2 includes the back roller 21. The back roller 21 is provided on the upstream side in the draft direction in the draft device 2 and is provided to convey the sliver S. The control device 90 starts the discharge spinning by the air-jet spinning device 3 after a predetermined period T1 based on at least one of the yarn speed and the draft condition has elapsed from the start of the rotation of the back roller 21.

Accordingly, the discharge spinning can be started immediately after the fiber bundle F is guided into the air-jet spinning device 3 while substantially starting the draft by the draft device 2. Therefore, an improvement in running efficiency and a reduction in the amount of waste yarn can be achieved.

In the spinning machine 100 of the present embodiment, the air-jet spinning device 3 includes the 1 st nozzle 33. The air-jet spinning device 3 injects air from the 1 st nozzle 33 into the spinning chamber 32 formed in the air-jet spinning device 3. The predetermined period T1 from the start of the rotation of the back roller 21 to the start of the air injection operation by the 1 st nozzle 33 is determined based on at least one of the yarn speed and the draft condition.

Accordingly, since the air jet operation by the 1 st nozzle 33 can be started immediately after the fiber bundle F reaches the air-jet spinning device 3 with a high possibility, the generation of the spun yarn Y can be started smoothly, and the running efficiency can be improved.

In the spinning machine 1 of the present embodiment, the draft condition includes at least any one of the total draft ratio, the main draft ratio, the back draft ratio, the feed ratio, and the gauge width.

Thereby, the spinning machine 1 can change the cycle time based on an appropriate condition.

The spinning machine 1 of the present embodiment includes an input device 92 (setting unit) for setting a yarn speed and/or draft condition.

This enables the operator to set a desired yarn speed and/or draft condition.

The spinning machine 100 of the present embodiment includes a yarn winding device 4, a suction port 64, and a yarn splicing device 62. The yarn winding device 4 winds the spun yarn Y generated by the air-jet spinning device 3 to form a package 45. The suction port 64 sucks and catches the spun yarn Y from the yarn winding device 4. The yarn splicing device 62 performs a splicing operation of splicing the spun yarn Y sucked and captured by the suction pipe 63 and the suction port 64. The yarn splicing operation by the yarn splicing device 62 is performed after the completion of the yarn discharge spinning by the air-jet spinning device 3.

Thus, the yarn splicing cycle can be smoothly performed without error according to the yarn speed and the draft condition, and the cycle time can be shortened.

The spinning machine 100 of the present embodiment includes a plurality of spinning units 1 and a yarn splicing cart 6. The yarn splicing cart 6 travels relative to the plurality of spinning units 1. Each spinning unit 1 is provided with a draft device 2 and an air spinning device 3. The joint carriage 6 is provided with a suction pipe 63, a suction port 64, and a joint device 62.

That is, the above-described configuration capable of shortening the cycle time at the time of piecing is particularly advantageous when the piecing carriage 6 is used in common for a plurality of spinning units 1. After the operation of 1 spinning unit 1 is completed, the yarn splicing cart 6 can start the operation of the other spinning unit 1 at a timing earlier than before.

The spinning machine 100 of the present embodiment includes a plurality of spinning units 1 and a doffing carriage 7. The doffing carriage 7 travels relative to the plurality of spinning units 1. Each spinning unit 1 is provided with a draft device 2 and an air spinning device 3. Each spinning unit 1 winds the spun yarn Y produced by the air-jet spinning device 3 to form a package 45. The doffing cart 7 doffs the package 45 that has become full-wound. The yarn drawing arm 73 is provided to the doffing carriage 7.

This can shorten the cycle time during doffing. This has the effect of being particularly advantageous in a configuration in which the doffing carriage 7 is commonly used by a plurality of spinning units 1. After the operation of 1 spinning unit 1 is completed, the doffing cart 7 can start the operation of the other spinning unit 1 at a timing earlier than before.

While the preferred embodiments of the present invention have been described above, the above-described configuration may be modified as follows, for example. The above-described configuration and the following modifications can be combined as appropriate.

The input device 92 may be configured to set the yarn speed at the time of the yarn discharge spinning instead of the start-up rate.

The operation timing of each unit is not limited to that obtained by the control device 90. For example, the control device 90 may transmit information on the set draft conditions and yarn speed to the unit control unit 50, and the unit control unit 50 may obtain the operation timing of each unit including the predetermined period T1. Alternatively, the operation timing may be determined by a carriage control unit of the splicing carriage 6 or a carriage control unit of the doffing carriage 7.

The operation timing of each unit (for example, the length of the predetermined period T1) may be determined based on not both the yarn speed and the draft condition but either one of them. That is, the operation timing of each section may be determined based on only the yarn speed, or the operation timing of each section may be determined based on only the draft condition.

The draft condition input to the spinning unit 1 by the operator through the input device 92 can be substantially expressed by the thickness of the fiber bundle passing through the draft rollers.

Each device may be arranged such that the spun yarn Y supplied from the lower side is wound on the upper side in the height direction in each spinning unit 1.

Instead of the yarn splicing cart 6, the yarn splicing device 62, the suction pipe 63, and the suction port 64 may be provided in each spinning unit 1.

The number of draft rollers in the draft device 2 is not limited to 4, and may be changed to 2, 3, or 5 or more.

The spinning unit 1 may draw the spun yarn Y from the air-jet spinning device 3 not through the yarn accumulating roller 11a but through a known nip roller and delivery roller. In this case, the feed ratio is the ratio of the peripheral speed of the front roller 24 to the peripheral speed of the delivery roller. That is, the feed ratio is (peripheral speed of the front roller 24)/(peripheral speed of the delivery roller).

When the spinning unit 1 includes the nip roller and the delivery roller, the yarn accumulating roller 11a may be provided downstream of these rollers. Alternatively, instead of the yarn accumulating device 11, a slackening tube and/or a mechanical compensator using a suction air flow may be provided.

In fig. 3, the fiber guide 31 is illustrated as supporting a needle-like member, but the needle-like member may not be provided. The shapes of the respective members of the open-end spinning device 3 are not limited to those shown in the drawings.