CN114575005A - Spinning machine and spinning method - Google Patents

Abstract

When the yarn is cut at the upstream side of the yarn accumulating device in the yarn feeding direction, the yarn remaining on the yarn accumulating roller can be properly treated by a simple structure. The yarn accumulating device (17) is provided with a suction device (49). When the spun yarn (7) is broken on the upstream side of the yarn accumulating device in the yarn feeding direction, the suction device causes air to act on the yarn end (7t) of the spun yarn on the package (9) side, thereby restraining the yarn end of the spun yarn on the package side with respect to the upstream side end portion area of the yarn accumulating roller (41). After the spun yarn is cut, the suction device performs an action on the spun yarn by air, and the package is rotated in a normal rotation direction, which is a direction in which the spun yarn is wound, by the winding device (21), so that the spun yarn remaining on the yarn accumulating roller is unwound from the yarn accumulating roller. The rotation of the package in the normal rotation direction is stopped at a time point before the yarn end of the spun yarn on the package side leaves the yarn accumulating roller and is wound into the package.

Description

Spinning machine and spinning method

Technical Field

The invention relates to a spinning machine and a spinning method.

Background

Conventionally, a spinning machine including a yarn feeding device, a winding device, and a yarn accumulating device is known. Patent document 1 discloses a spinning machine as such a spinning machine.

In the spinning machine of patent document 1, a yarn accumulating roller is provided in the yarn accumulating device. The yarn can be temporarily stored by winding the yarn around the outer peripheral surface of the yarn storage roller. A suction device is provided downstream of the yarn accumulating roller. When a yarn break occurs downstream of the yarn accumulating device, the yarn accumulated in the yarn accumulating roller is sucked by the suction device and removed.

Patent document 1: japanese patent laid-open publication No. 2014-125349

However, the structure of patent document 1 merely discloses the following structure: when yarn breakage occurs on the downstream side of the yarn accumulating device, the yarn remaining in the yarn accumulating roller is removed.

Disclosure of Invention

The invention aims to properly process yarns remained on a yarn accumulating roller through a simple structure after yarns are broken at the upstream side of a yarn accumulating device in the yarn feeding direction.

According to the 1 st aspect of the present invention, there is provided a spinning machine of the following construction. That is, the spinning machine includes a yarn feeding device, a winding device, and a yarn accumulating device. The yarn feeding device can feed yarn. The winding device winds the yarn supplied from the yarn supplying device to form a package. The yarn accumulating device is disposed in the middle of a yarn running path formed between the yarn feeding device and the winding device. The yarn accumulating device includes a yarn accumulating roller and a yarn acting portion. The yarn accumulating roller winds and accumulates the yarn supplied from the yarn supplying device. The yarn acting section acts air on the yarn end of the yarn on the package side when the yarn is broken on the upstream side in the yarn feeding direction with respect to the yarn accumulating device, thereby restraining the yarn end of the yarn on the package side with respect to the upstream side end portion region of the yarn accumulating roller. After the yarn is cut, the yarn acting section performs an action on the yarn by air, and the package is rotated in a normal rotation direction, which is a direction in which the yarn is wound, by the winding device, so that the yarn remaining in the yarn accumulating roller is unwound from the yarn accumulating roller. The rotation of the package in the normal rotation direction is stopped at a time point before the yarn end of the yarn on the package side leaves the yarn accumulating roller and is wound into the package.

In the present specification, the case where the yarn acting section restrains the yarn end of the yarn on the package side includes a case where the yarn end is completely restrained and a case where the vicinity of the portion where the yarn end is restrained.

Thus, the yarn on the package side can be appropriately processed with a simple configuration after the yarn on the upstream side in the yarn feeding direction from the yarn accumulating device is cut. The yarn end of the yarn on the package side can be reliably restrained by air.

In the spinning machine, the following configuration is preferable. That is, the spinning machine includes a reversing valve and a control device. The direction changing valve switches between generation and stop of the air flow by the yarn acting portion. The control device controls the direction change valve.

This allows the yarn working section to generate an air flow only when necessary, thereby saving energy.

In the spinning machine, the following configuration is preferable. That is, the yarn acting portion is a suction device. The suction device has a suction port facing the yarn accumulating roller, and sucks the yarn end of the yarn remaining on the yarn accumulating roller by the suction port.

Thus, the yarn end of the yarn remaining on the yarn accumulating roller is sucked, whereby the behavior of the yarn can be stabilized. As a result, the yarn end does not get tangled with the yarn, and therefore, the yarn remaining on the yarn accumulating roller is easily unwound.

In the spinning machine, the following configuration is preferable. That is, the yarn accumulating device includes a yarn introducing portion disposed upstream of the most upstream portion of the outer peripheral surface of the yarn accumulating roller around which the yarn is wound. The yarn supplied from the yarn supplying device is guided to the most upstream part of the yarn accumulating roller through the yarn introducing part. The suction port is disposed toward the yarn introducing portion.

Thus, the yarn end of the yarn remaining in the yarn accumulating roller can be reliably sucked through the suction port of the suction device.

In the above spinning machine, the following configuration is preferable. That is, the yarn accumulating roller accumulates the yarn by rotating in a normal rotation direction, which is a direction in which the yarn from the upstream is wound. When the yarn is cut on the upstream side of the yarn accumulating device in the yarn feeding direction, the rotation of the package and the yarn accumulating roller in the normal rotation direction is stopped. After the package and the yarn accumulating roller stop rotating in the forward rotation direction, the yarn accumulating roller rotates in the reverse rotation direction.

Thereby, the yarn end of the yarn remaining on the yarn accumulating roller is unwound upstream by the rotation of the yarn accumulating roller in the reverse direction. Therefore, the yarn end can be more reliably sucked through the suction port of the suction device.

In the spinning machine, it is preferable that the yarn accumulating roller rotates in a forward direction after the yarn accumulating roller rotates in a reverse direction.

Accordingly, by rotating the yarn accumulating roller in the normal rotation direction in a state where the yarn is sucked by the suction port, a winding action on the yarn accumulating roller due to the yarn continuing between the package and the yarn accumulating roller can be generated, and the yarn remaining on the yarn accumulating roller can be aligned on the yarn accumulating roller. Therefore, the yarn remaining on the yarn accumulating roller can be smoothly unwound from the yarn accumulating roller.

In the above spinning machine, it is preferable that the rotation amount of the yarn accumulating roller in the normal rotation direction after the rotation in the reverse rotation direction is smaller than the rotation amount of the yarn accumulating roller in the reverse rotation direction.

This prevents the yarn end sucked by the suction port of the suction device when the yarn accumulating roller rotates in the reverse direction from being separated from the suction port when the yarn accumulating roller rotates in the normal direction. Therefore, the restraining action by the suction device can be continued.

In the spinning machine, the yarn acting portion may be an injection device that injects air around the yarn accumulating roller.

Thereby, the behavior of the portion of the yarn can be substantially stabilized by the injection of air forming the injection device.

In the spinning machine, the following configuration is preferable. That is, the yarn accumulating device includes a yarn hooking member and a yarn removing member. The yarn hooking member rotates relative to the yarn accumulating roller. The yarn pulled out from the yarn accumulating roller is hooked on the yarn hooking member. The yarn removing means performs a yarn removing operation of removing the yarn path from the yarn hooking means at a 1 st time point which is a time point after a time point at which the yarn end of the yarn on the package side is separated from the yarn accumulating roller.

Thus, even if the yarn end of the yarn on the package side is entangled with the yarn hooking member when the yarn end is separated from the yarn accumulating roller, the yarn end can be detached from the yarn hooking member by the yarn detaching member.

In the spinning machine, the following configuration is preferable. That is, the yarn removing means is configured to perform the yarn removing operation also at a 2 nd time point different from the 1 st time point. A 1 st operation amount of the yarn removing member related to the yarn removing operation performed at the 1 st time point is different from a 2 nd operation amount of the yarn removing member related to the yarn removing operation performed at the 2 nd time point.

Thus, even if the yarn end is entangled with the yarn hooking member when the yarn end of the yarn on the package side is separated from the yarn accumulating roller, the yarn end can be reliably removed from the yarn hooking member by a yarn removing operation different from the other yarn removing operations.

In the above spinning machine, it is preferable that the yarn feeding device, the winding device, and the yarn accumulating device are respectively provided in a plurality of spinning units.

This makes it possible to easily use the yarn feeding device, the winding device, and the yarn accumulating device.

In the spinning machine, it is preferable that each of the plurality of spinning units includes a driving section of the winding device.

This enables control to independently drive and stop the winding device for each spinning unit.

In the spinning machine, the following configuration is preferable. That is, in each of the plurality of spinning units, the yarn accumulating device includes a yarn hooking member and a yarn removing member. The yarn hooking member rotates relative to the yarn accumulating roller and hooks the yarn drawn out from the yarn accumulating roller. The yarn removing means performs a yarn removing operation of removing the yarn path from the yarn hooking means after a time point when the yarn end of the yarn on the package side is separated from the yarn accumulating roller. Each of the plurality of spinning units includes a driving portion of the yarn removing member.

Thus, unlike the conventional art, control can be performed in which the yarn removing lever is independently operated for each spinning unit.

According to the 2 nd aspect of the present invention, the following spinning method is provided. That is, the spinning method is executed by a spinning machine including a yarn feeding device, a winding device, and a yarn accumulating device. The yarn feeding device can feed yarn. The winding device winds the yarn supplied from the yarn supplying device to form a package. The yarn accumulating device is disposed in the middle of a yarn running path formed between the yarn feeding device and the winding device. The yarn accumulating device includes a yarn accumulating roller and a yarn acting portion. The yarn accumulating roller winds and accumulates the yarn supplied from the yarn supplying device. The yarn acting section is configured to, when the yarn is broken on the upstream side in the yarn feeding direction with respect to the yarn accumulating device, apply air to the yarn end of the yarn on the package side to restrain the yarn end of the yarn on the package side with respect to an upstream end portion region of the yarn accumulating roller. After the yarn is cut, the yarn acting section causes air to act on the yarn, and the winding device rotates the package in a normal rotation direction, which is a direction in which the yarn is wound, to unwind the yarn remaining on the yarn accumulating roller from the yarn accumulating roller. The rotation in the normal rotation direction of the package is stopped at a time point before the yarn end of the yarn on the package side leaves the yarn accumulating roller and is wound into the package.

Thus, the yarn on the package side can be appropriately processed after the yarn on the upstream side in the yarn running direction from the yarn accumulating device is cut.

Drawings

Fig. 1 is a side view showing a structure of a spinning unit provided in a spinning machine according to an embodiment of the present invention.

Fig. 2 is a control block diagram of the spinning unit.

Fig. 3 is a view showing a positional relationship between the yarn accumulating roller of the yarn accumulating device and the suction device.

Fig. 4 is a view showing the rotation state of the package and the yarn accumulating roller.

Fig. 5 is a perspective view illustrating the detection device and the capturing device.

Description of the reference numerals

Spinning (yarn); 9.. packaging; a yarn accumulating device; a winding device; a yarn feeding device; a yarn accumulating roller; 45.. flyer (hanging yarn member); a suction device (yarn acting portion); a yarn removal lever (yarn removal component); 71.. a suction port; 79..

Detailed Description

A spinning machine according to an embodiment of the present invention will be described with reference to fig. 1 and 2. In the following description, "upstream" and "downstream" refer to upstream and downstream in the traveling direction (yarn running direction) of the yarn (specifically, the sliver 3, the fiber bundle 5, and the spun yarn 7), respectively.

The spinning machine includes at least one spinning unit 1 and a machine control device not shown. The machine control device manages one or more spinning units 1. The spinning unit 1 transports the fiber bundle 5 to the downstream side in the yarn running direction by the draft device 11, spins the fiber bundle 5 transported from the draft device 11 by the spinning device 13 to produce a spun yarn 7, and winds the spun yarn 7 by the winding device 21 to form a package 9. In fig. 5, the cylindrical package 9 is illustrated, but the spinning machine may be configured such that the spun yarn 7 is wound into the conical package 9.

As shown in fig. 1, one spinning unit 1 includes a draft device 11, a spinning device 13, a yarn monitoring device 15, a yarn accumulating device 17, a yarn joining device 19, and a winding device 21. The draft device 11, the spinning device 13, the yarn monitoring device 15, the yarn accumulating device 17, the yarn joining device 19, and the winding device 21 are arranged in this order from the upstream side to the downstream side in the yarn running direction.

As shown in fig. 2, the devices and the like provided in the spinning unit 1 are controlled by a unit controller (control device) 25 provided in the spinning unit 1. Further, at least one of the devices provided in the spinning unit 1 may be controlled by the machine base control device. Further, one unit controller may be provided for each predetermined amount of the spinning units 1.

The draft device 11 generates the fiber bundle 5 by drawing (drafting) the sliver 3 supplied from a can or the like (not shown). The draft device 11 is configured to rotate draft rollers in a draft direction while sandwiching the yarn 3 between the draft rollers and opposed rollers opposed thereto, to transport the yarn 3 to a downstream side, and to draw the yarn to a predetermined fiber amount (or thickness) to generate a fiber bundle 5.

The draft device 11 includes a plurality of draft rollers including a back roller 31, a third roller 33, a middle roller 35, and a front roller 37. These rollers 31, 33, 35, 37 are arranged in order from the upstream side toward the downstream side. A rubber belt 39 is wound around the intermediate roller 35. Each draft roller is rotationally driven at a predetermined rotational speed.

The spinning device 13 is provided downstream of the front roller 37 of the draft device 11. The spinning device 13 twists the fiber bundle 5 supplied from the draft device 11 to produce a spun yarn 7. In the present embodiment, an air-type spinning device that twists the fiber bundle 5 with a swirling air flow is used as the spinning device 13.

In the spinning unit 1 (spinning machine), the draft device 11 and the spinning device 13 constitute a yarn feeding device 23 capable of supplying the spun yarn 7. The spun yarn 7 generated in the yarn feeding device 23 travels from the yarn feeding device 23 toward the winding device 21. A yarn path (yarn path) through which the spun yarn 7 travels is formed between the yarn feeding device 23 and the winding device 21.

A yarn monitoring device 15 is provided downstream of the spinning device 13. The yarn monitoring device 15 monitors the presence or absence of the spun yarn 7 and the quality (the presence or absence of the thickness and/or the foreign matter, etc.). In the yarn monitoring device 15, non-contact monitoring is performed by a transmission type optical sensor. When detecting a yarn defect of the spun yarn 7 (for example, a portion where the thickness of the spun yarn 7 is abnormal), the yarn monitoring device 15 transmits a yarn defect detection signal to the unit controller 25.

Upon receiving the yarn defect detection signal, the unit controller 25 stops the spun yarn in the spinning device 13 to cut the spun yarn 7. I.e. the spun yarn 7 is broken. The unit controller 25 stops the draft operation by the draft device 11 when stopping the spinning in the spinning device 13. At the same time as the spun yarn 7 is cut or at a time point when a predetermined time has elapsed since the spun yarn 7 was cut, the unit controller 25 stops the winding operation by the winding device 21 and the drawing operation by the yarn accumulating device 17.

The yarn monitoring device 15 is not limited to a transmission-type optical sensor, and may monitor the presence or absence and quality of the spun yarn 7 by a capacitance-type sensor, for example. Instead of stopping the spun yarn and cutting the spun yarn 7, a structure may be adopted in which the spun yarn 7 is cut by a cutting device provided in the vicinity of the yarn monitoring device 15.

A yarn accumulating device 17 is provided downstream of the yarn monitoring device 15 (i.e., downstream of the spinning device 13). The yarn accumulating device 17 is disposed in the middle of a yarn path (yarn path) formed between the yarn feeding device 23 and the winding device 21. The yarn accumulating device 17 includes a yarn accumulating roller 41, a yarn accumulating motor 43, a flyer (yarn hooking member) 45, a yarn detection sensor 47, a suction device (yarn working section) 49, and a yarn removing rod (yarn removing member) 51.

The yarn accumulating roller 41 can wind and accumulate the spun yarn 7 supplied from the yarn supplying device 23. The spun yarn 7 is stored in a state wound around the outer peripheral surface of the yarn storage roller 41. The yarn accumulating roller 41 is rotated in the normal rotation direction or the reverse rotation direction by a yarn accumulating motor 43. In the present embodiment, since a known delivery roller pair is not provided between the spinning device 13 and the yarn accumulating device 17, the yarn accumulating device 17 performs a drawing operation of drawing the spun yarn 7 from the spinning device 13. However, a delivery roller pair may be provided between the spinning device 13 and the yarn accumulating device 17.

The yarn accumulating motor 43 may be configured as an electric motor capable of forward rotation and reverse rotation. The yarn accumulating motor 43 rotates in the normal direction to rotate the yarn accumulating roller 41 in the normal direction. The yarn accumulating motor 43 rotates in the reverse direction to rotate the yarn accumulating roller 41 in the reverse direction. The yarn accumulating motor 43 rotates the yarn accumulating roller 41 in the normal rotation direction to perform a drawing operation during normal spinning of the spinning unit 1.

The flyer 45 is attached to a downstream end (leading end) of the yarn accumulating roller 41. The flyer 45 is provided so as to be able to contact the spun yarn 7 drawn out from the yarn accumulating roller 41. The flyer 45 is supported to be rotatable relative to the yarn accumulating roller 41. Either the flyer 45 or the yarn accumulating roller 41 is provided with a permanent magnet, and the other is provided with a magnetic hysteresis material. By means of these magnetic units, a torque is generated which counteracts the relative rotation of the flyer 45 with respect to the yarn accumulating roller 41. Therefore, in a state where the spun yarn 7 is caught by the flyer 45, only when a force such as the above-described torque is applied to the flyer 45 (that is, when the spun yarn 7 is applied with a predetermined or more tension), the flyer 45 rotates relative to the yarn accumulating roller 41, and the spun yarn 7 wound around the yarn accumulating roller 41 can be unwound. On the other hand, when the force against the torque is not applied to the flyer 45, the yarn accumulating roller 41 and the flyer 45 rotate integrally, and the spun yarn 7 is accumulated in the yarn accumulating roller 41.

In this way, the yarn accumulating device 17 operates to unwind the spun yarn 7 when the tension of the spun yarn 7 on the downstream side is increased, and to stop unwinding of the spun yarn 7 when the tension of the spun yarn 7 on the downstream side is decreased (the spun yarn 7 tends to slacken). Thereby, the yarn accumulating device 17 can remove the slack of the spun yarn 7 and apply an appropriate tension to the spun yarn 7. Further, the flyer 45 operates as described above to absorb the variation in the tension applied to the spun yarn 7 between the yarn accumulating device 17 and the winding device 21, and thereby the variation in the tension can be prevented from affecting the spun yarn 7 from the spinning device 13 to the yarn accumulating device 17.

Instead of such a magnetic unit, the yarn accumulating device 17 may be provided with an electromagnet instead of a permanent magnet. Alternatively, the yarn accumulating device 17 may be provided with a motor for rotationally driving the flyer 45 without including a magnetic unit.

The yarn detection sensor 47 is a sensor for detecting the amount of accumulated yarn in the yarn accumulating roller 41. The yarn detection sensor 47 is provided to be able to detect the spun yarn 7 at a predetermined position of the yarn accumulating roller 41. The yarn detection sensor 47 can detect whether or not the yarn accumulated amount is equal to or larger than a predetermined amount by detecting the presence or absence of the spun yarn 7 at the predetermined position. When the spun yarn 7 is wound into the package 9, the unit controller 25 controls the rotation speed of the winding drum 63 of the winding device 21 based on the detection result of the yarn detection sensor 47, and adjusts the yarn accumulating amount of the yarn accumulating roller 41 to an amount (value) within a predetermined range.

The suction device 49 is disposed on the side of the yarn accumulating roller 41 in the direction intersecting the axial direction of the yarn accumulating roller 41. The suction device 49 includes a hollow tube 73. The suction device 49 is connected to a suction source 75 as a negative pressure source, and can generate a suction air flow in the tube 73. The suction device 49 generates a suction air flow around the yarn accumulating roller 41 when the spun yarn 7 is cut off at the upstream side in the yarn feeding direction from the yarn accumulating device 17 (between the yarn feeding device 23 and the yarn accumulating device 17). Thus, the suction device 49 can suction and catch the portion of the spun yarn 7 on the package 9 side on the upstream side of the yarn accumulating roller 41.

The yarn removing rod 51 is disposed in the vicinity of the yarn accumulating roller 41. The yarn removing lever 51 can perform a yarn removing operation for removing the spun yarn 7 (yarn path) from the flyer 45. The yarn removing lever 51 is movably provided so as to be movable between a standby position and a yarn removing position. Fig. 1 shows a state where the yarn removing lever 51 is at the standby position, and shows a moving direction of the yarn removing lever 51 when moving from the standby position to the yarn removing position by an arrow. The yarn removing lever 51 passes through a space downstream of the yarn accumulating roller 41 while moving from the standby position to the yarn removing position. At this time, if there is a spun yarn 7 hooked on the flyer 45, the yarn take-off lever 51 is operated to the spun yarn 7, and the spun yarn 7 is taken off from the flyer 45.

In the present embodiment, the yarn removing lever 51 is configured as a single spindle drive type. That is, the yarn removing lever 51 is provided in each spinning unit 1, and a separate driving unit (a motor, an air cylinder, or the like) is provided for each yarn removing lever 51. Therefore, the yarn removal lever 51 can operate independently of the yarn removal lever 51 of the other spinning unit 1.

A guide (guide member) 55 for guiding the spun yarn 7 wound into the package 9 is provided on the downstream side of the yarn accumulating roller 41. The guide 55 can restrict the path of the spun yarn 7 at a position downstream of the yarn accumulating roller 41. The guide 55 is, for example, a U-shaped or partially notched circular portion formed as a plate-like member fixed to the spinning unit 1.

The yarn joining device 19 is provided downstream of the guide 55 (i.e., downstream of the yarn accumulating device 17). When the spun yarn 7 is disconnected between the yarn feeding device 23 and the winding device 21 in the yarn feeding direction, the yarn splicing device 19 performs a yarn splicing process of connecting the spun yarn 7 from the yarn feeding device 23 and the spun yarn 7 from the package 9. In the present embodiment, the yarn joining device 19 is a connecting device that twists yarn ends with each other by a swirling air flow generated by air. Further, instead of the connecting device, a mechanical splice unit or the like can be used as the yarn splicing device 19.

The spinning unit 1 is provided with a guide device 57. When the spun yarn 7 is cut off on the upstream side of the yarn accumulating device 17, the guide device 57 guides the spun yarn 7 from the yarn feeding device 23 to the yarn joining device 19. The guide device 57 is rotatably supported at one end in the longitudinal direction thereof and is rotatable in the vertical direction. The guide device 57 is provided with a hollow member, and is connected to a suction source 75. The guide device 57 can generate a suction airflow through a suction port 59 provided at the other end in the longitudinal direction thereof. The guide device 57 is rotated downward, and can catch the yarn end of the spun yarn 7 from the yarn feeding device 23 by the suction port 59. The guide device 57 can guide the yarn end of the spun yarn 7 from the yarn feeding device 23 to the yarn joining device 19 by rotating upward after catching the yarn end.

The yarn end of the spun yarn 7 from the yarn feeding device 23 is guided to the yarn joining device 19 by the guide device 57. As will be described later, the spun yarn 7 from the package 9 is caught by the catching device 83 and guided to the yarn joining device 19. In this state, the yarn joining device 19 is driven to perform the yarn joining process so as to connect the spun yarn 7 from the yarn supplying device 23 and the spun yarn 7 from the package 9. Thus, even when the spun yarn 7 is disconnected on the upstream side of the yarn accumulating device 17, the spinning unit 1 can restart the stopped spun yarn and perform the yarn joining process, and can rewind the spun yarn 7 from the yarn supplying device 23 into the package 9.

A winding device 21 is provided downstream of the yarn accumulating device 17 (downstream of the yarn joining device 19 in the present embodiment). The winding device 21 winds the spun yarn 7 supplied from the yarn feeding device 23 to form a package 9. In the present embodiment, the winding device 21 is provided at a position higher than the upstream end of the draft device 11 in the height direction of the spinning unit 1. In this way, the spinning unit 1 has a layout in which yarn paths are arranged to extend from the bottom to the top. The winding device 21 includes a cradle arm 61 and a winding drum 63.

The swing arm 61 can rotatably support a winding tube 67 for winding the spun yarn 7. The rocker arm 61 can rotate about its root as a rotation center. Thus, in the winding device 21, even if the spun yarn 7 is wound around the winding tube 67 and the diameter of the package 9 is increased, the winding of the spun yarn 7 can be appropriately continued.

The winding drum 63 is controlled by the unit controller 25 by a winding drum driving motor not shown, and rotates in contact with the outer peripheral surface of the winding tube 67 or the package 9. A traverse groove, not shown, is formed in the outer peripheral surface of the winding drum 63, and the spun yarn 7 can be traversed by a predetermined width through the traverse groove. Thus, the winding device 21 winds the spun yarn 7 around the winding tube 67 while traversing, and can form the package 9.

In the present embodiment, the winding device 21 is configured as a single spindle drive type. That is, the winding device 21 provided in each spinning unit 1 has a separate driving unit (winding drum driving motor), and is configured to rotate the winding drum 63 and thus the package 9. The winding device 21 can change the rotation operation of the package 9 independently of the winding device 21 of the other spinning unit 1.

The winding device 21 may be a known configuration including a winding drum without a traverse groove and a traverse guide that is provided independently of the winding drum and reciprocates, instead of the configuration including the winding drum 63 with a traverse groove.

Next, with reference to fig. 3 and 4, the processing of the spun yarn 7 on the package 9 side performed after the spun yarn 7 is cut off between the yarn supplying device 23 and the yarn accumulating device 17 will be described.

When the spinning by the spinning unit 1 is normally performed, the package 9 of the winding device 21 and the yarn accumulating roller 41 of the yarn accumulating device 17 rotate in predetermined directions, respectively. In the following description, at this time, there are cases where: the predetermined direction in which the package 9 rotates is referred to as a normal rotation direction, and the predetermined direction in which the yarn accumulating roller 41 rotates is referred to as a normal rotation direction.

In the spinning unit 1, there are cases where: when the spun yarn 7 is supplied from the yarn feeding device 23 and the package 9 rotates in the normal rotation direction, the spun yarn 7 is cut based on the monitoring result of the yarn monitoring device 15 as described above. In this case, the spun yarn 7 is disconnected between the yarn feeding device 23 and the yarn accumulating device 17 in the yarn running direction. In the present embodiment, the spun yarn 7 is cut by stopping the feeding operation of the yarn feeding device 23. Then, the drawing operation of the yarn accumulating device 17 and the winding operation of the winding device 21 are stopped immediately or after a predetermined time has elapsed.

At the time when the spun yarn 7 is broken, as shown by the two-dot chain line in fig. 1, the yarn end 7t of the spun yarn 7 on the package 9 side is positioned between the yarn supplying device 23 and the yarn accumulating device 17. In the present embodiment, the yarn end 7t (see reference numeral 7c in fig. 3) is captured in advance by the suction device 49 of the yarn accumulating device 17, and in this state, the winding operation by the winding device 21 is performed at a speed slower than that before the spun yarn 7 is cut, whereby the spun yarn 7 remaining on the yarn accumulating roller 41 is unwound from the yarn accumulating roller 41 to the winding device 21 side. The operation of the suction device 49 at this time will be described later.

The spun yarn 7 is unwound from the yarn accumulating roller 41, and finally the unwinding of the spun yarn 7 from the yarn accumulating roller 41 is completed. When all the spun yarns 7 are unwound from the yarn accumulating roller 41, the end portions thereof are separated from the yarn accumulating roller 41 and immediately thereafter caught by the catching device 83. The change in the yarn path accompanying the catching of the spun yarn 7 by the catching device 83 is detected by the detecting device 81. The details of the capturing device 83 and the detecting device 81 will be described later.

When the detection device 81 does not detect the detected spun yarn 7, the unit controller 25 stops the rotation of the package 9 formed by the winding device 21 in the normal rotation direction. As a result, the yarn end 7t of the spun yarn 7 on the package 9 side can be positioned on the downstream side of the yarn accumulating device 17 and on the upstream side of the winding device 21.

Thus, after the spun yarn 7 is cut off in the yarn running direction between the yarn feeding device 23 and the yarn accumulating device 17, the spun yarn 7 on the package 9 side can be appropriately processed with a simple configuration. In the present embodiment, the yarn defect included in the spun yarn 7 on the package 9 side can be removed from the spun yarn 7 by the catching device 83. The position where the yarn end 7t of the spun yarn 7 on the package 9 side is caught by the catching device 83 is not particularly limited, and may be any position between the yarn accumulating device 17 and the winding device 21 in the yarn running direction.

Next, the suction device 49 will be described in detail. When the spun yarn 7 is cut off between the yarn accumulating device 17 and the yarn supplying device 23, the draft operation of the draft device 11 is immediately stopped. In conjunction with the stop of the draft operation, the drawing operation of the yarn accumulating device 17 and the winding operation of the winding device 21 are stopped immediately or after a predetermined time has elapsed. Therefore, in a state where the yarn end 7t of the spun yarn 7 on the package 9 side is positioned on the upstream side of the yarn accumulating roller 41, the spun yarn 7 on the package 9 side is stopped in a state where the package 9 and the yarn accumulating device 17 are connected to each other. Subsequently, the normal rotation of the package 9 formed by the winding device 21 is resumed and the spun yarn 7 is unwound from the yarn accumulating roller 41 to the downstream side at a speed lower than that before the yarn breakage. During this unwinding operation, the yarn end 7t on the upstream side of the yarn accumulating roller 41 is sucked and caught by the suction device 49.

Specifically, the unit controller 25 causes the suction device 49 to generate a suction air flow, and causes the suction device 49 to suck and catch the yarn end 7t located on the upstream side of the yarn accumulating roller 41 from the suction port 71. Thereby, the spun yarn 7 is restrained with respect to the upstream end portion region of the yarn accumulating roller 41, and the path change of the spun yarn 7 on the immediately upstream side of the yarn accumulating roller 41 is prevented while all the spun yarns 7 remaining on the yarn accumulating roller 41 are unwound to the downstream side. In other words, the suction device 49 prevents the yarn end 7t of the spun yarn 7 from being freely restricted, and holds the position of the spun yarn 7.

As shown in fig. 3, the suction device 49 includes a tube 73. The tube 73 has a suction port 71 at one end in the longitudinal direction, and is connected to a suction source 75 at the other end in the longitudinal direction. The suction port 71 faces the yarn accumulating roller 41. A 1 st valve (direction change valve) 77 is provided in a longitudinal middle portion of the pipe 73. The opening and closing of the 1 st valve 77 is controlled by the unit controller 25. By controlling the 1 st valve 77 to be opened, the suction air flow can be generated in the pipe 73 of the suction device 49. By controlling the 1 st valve 77 to be closed, the suction air flow of the duct 73 can be stopped. When the suction airflow is generated, a suction force acts on the outer peripheral surface of the yarn accumulating roller 41, and the spun yarn 7 wound around the outer peripheral surface (the spun yarn 7 remaining on the yarn accumulating roller 41) is sucked from the suction port 71. By sucking the spun yarn 7 from the suction port 71 into the tube 73, the spun yarn 7 can be restrained at a fixed position with respect to the yarn accumulating roller 41. The suction source 75 is provided at, for example, a machine base end of the spinning machine and shared by the plurality of spinning units 1.

The suction port 71 is disposed toward the yarn introducing portion 79 of the yarn accumulating device 17. The yarn introducing section 79 is a region of the outer peripheral surface of the yarn accumulating roller 41 which is located immediately before the spun yarn 7 starts to be wound substantially.

The yarn introduction portion 79 will be explained in detail. The yarn accumulating roller 41 has a cylindrical accumulating portion 41a, and the spun yarn 7 is spirally wound around the accumulating portion 41 a. In fig. 3, the storage portion 41a is illustrated as a cylindrical shape having a constant outer diameter, but may be configured to have a tapered shape in which the outer diameter gradually or linearly decreases toward the downstream. The spun yarn 7 is wound as the package 9 rotates in the normal rotation direction, and the spun yarn 7 travels from the upstream to the downstream in a spiral path in the storage portion 41a of the yarn storage roller 41. The axis of the yarn accumulating roller 41 coincides with the spiral axis of the spun yarn 7 wound therearound. The yarn accumulating roller 41 has a tapered portion 41b formed at an upstream end corresponding to the spiral, of both ends of the yarn accumulating roller 41 in the axial direction. The tapered portion 41b corresponds to the yarn introduction portion 79.

The yarn introducing portion 79 is disposed in an upstream end portion region of the yarn accumulating roller 41. Therefore, the spun yarn 7 captured by the suction port 71 of the suction device 49 is restrained in a state of being positioned in the vicinity of the upstream end portion region of the yarn accumulating roller 41.

Hereinafter, the axial upstream side of the yarn accumulating roller 41 means the upstream side of the spiral in the axial direction, and the axial downstream side means the downstream side of the spiral in the axial direction.

The tapered portion 41b is formed in a substantially conical shape having a larger diameter than the storage portion 41 a. The tapered portion 41b has a diameter that decreases as it approaches the storage portion 41a, and is equal to the diameter of the storage portion 41a at a portion connected to the storage portion 41 a.

The yarn introducing portion 79 is disposed on the axially upstream side (lower side in fig. 3) of the yarn accumulating roller 41 from the most upstream portion 80 where the spun yarn 7 is aligned and wound on the accumulating portion 41 a. The spun yarn 7 from the upstream side in the yarn running direction is given tension by the rotation of the yarn accumulating roller 41, and is guided to the most upstream portion 80 while being brought into contact with and guided by the yarn introducing portion 79 (tapered portion 41b) as necessary.

By rotating the yarn accumulating roller 41 while guiding the spun yarn 7 to a predetermined position, the spun yarn 7 wound in advance in the accumulating portion 41a is pressed by the spun yarn 7 wound subsequently and moves little by little toward the downstream side in the axial direction. As a result, the spun yarns 7 can be stored in the storage portion 41a in a aligned state.

Referring to the timing chart of fig. 4, the rotation control of the yarn accumulating roller 41 and the package 9 when the spun yarn 7 is cut off on the upstream side of the yarn accumulating roller 41 will be specifically described. The time t0 is the time at which the spun yarn 7 is broken. When the spun yarn 7 is disconnected, the unit controller 25 stops the rotation of the package 9 in the normal rotation direction and the rotation of the yarn accumulating roller 41 in the normal rotation direction at a time point t1 when a predetermined time has elapsed from the time point t 0. Specifically, the unit controller 25 stops the driving of the winding drum driving motor and the driving of the yarn accumulating motor 43. The yarn end 7t of the spun yarn 7 on the package 9 side is wound around the yarn accumulating roller 41 by the rotation in the normal rotation direction of the yarn accumulating roller 41 before stopping at the time point t 1. At the time point t1, the yarn end 7t of the spun yarn 7 on the package 9 side is positioned near the most upstream portion 80.

Thereafter, the unit controller 25 starts the rotation of the yarn accumulating roller 41 in the reverse direction while maintaining the state of stopping the rotation of the package 9 at the time point t 2. The unit controller 25 controls to open the 1 st valve 77 at a time point t2 or a time point slightly before it. This causes a suction flow to be generated in the suction device 49. The reverse rotation of the yarn accumulating roller 41 is continued to a time point t 3.

The yarn end 7t of the spun yarn 7 on the package 9 side is sucked by the suction device 49 by the reverse rotation of the yarn accumulating roller 41. Accordingly, the spun yarn 7 is unwound from the yarn accumulating roller 41 to the upstream side. As described above, the suction port 71 of the suction device 49 is disposed to face the yarn introducing portion 79. Therefore, in the process of rotating the yarn accumulating roller 41 in the reverse direction, the yarn end 7t located in the vicinity of the most upstream portion 80 is easily sucked by the suction port 71. In fig. 3, a yarn end 7t sucked by the suction device 49 is denoted by reference numeral 7 c.

At a time point t3 when the yarn accumulating roller 41 is rotated by a predetermined rotation amount in the reverse direction, the unit controller 25 stops the rotation in the reverse direction.

At the same time point t3 as the stop of the rotation in the reverse direction, the yarn accumulating roller 41 starts the rotation in the normal direction. The rotation of the yarn accumulating roller 41 in the normal rotation direction continues to the time point t 4. The rotation in the normal rotation direction may be started after a predetermined time has elapsed after the rotation in the reverse rotation direction is stopped.

The spun yarn 7 once sucked by the suction device 49 is partially pulled out by the normal rotation of the yarn accumulating roller 41 from time t3 to time t4, and is wound around the yarn accumulating roller 41. Since the suction port 71 of the suction device 49 faces the yarn introducing portion 79, the spun yarn 7 drawn out from the suction device 49 is naturally guided from the yarn introducing portion 79 to the most upstream portion 80 in accordance with the rotation of the yarn accumulating roller 41 in the normal rotation direction. Therefore, the spun yarns 7 can be aligned well in the accumulating portion 41 a.

From time t3 to time t4, the yarn accumulating roller 41 rotates only slightly in the normal rotation direction. Specifically, the amount of rotation in the normal rotation direction is smaller than the amount of rotation in the reverse rotation direction of the yarn accumulating roller 41 after the spun yarn 7 is cut. Therefore, at this time, the yarn end 7c of the spun yarn 7 on the package 9 side is not completely pulled out from the suction device 49. In other words, at the time point t4, the yarn end 7c is kept in the state of entering the inside of the suction device 49. That is, at this time, the yarn end 7c does not protrude from the suction port 71.

The spun yarn 7 is partially drawn out from the suction device 49 in accordance with the rotation of the yarn accumulating roller 41 in the normal rotation direction, but the suction device 49 causes a suction airflow against the direction of the drawing. Therefore, the suction device 49 also functions as a resistance imparting portion that imparts resistance against the direction in which the spun yarn 7 travels toward the direction of winding around the yarn accumulating roller 41.

After the yarn accumulating roller 41 stops rotating in the normal rotation direction at time t4, the package 9 starts rotating in the normal rotation direction at time t 5. As a result, the spun yarn 7 is pulled toward the package 9, and therefore, the spun yarn 7 is unwound from the yarn accumulating roller 41 toward the downstream side. At this time, the yarn end 7c on the upstream side is sucked by the suction device 49, and therefore entanglement or the like of the yarn end 7c with the unwound spun yarn 7 is prevented. Therefore, the spun yarn 7 is smoothly unwound from the yarn accumulating roller 41.

While the package 9 is rotating in the normal rotation direction, the yarn end 7c starts to be drawn out from the suction device 49 almost simultaneously with the unwinding of all the spun yarn 7 from the yarn accumulating roller 41. Finally, the yarn end 7c of the spun yarn 7 on the package 9 side is separated from the suction device 49 and moves to the downstream side of the yarn accumulating device 17. Thereafter, the unit controller 25 controls to close the 1 st valve 77. Thereby, the suction flow of the suction device 49 is stopped.

The meaning of the control of rotating the yarn accumulating roller 41 in the reverse rotation direction and the normal rotation direction as shown from time t2 to time t4 will be described below.

The spun yarn 7 is produced by twisting by the spinning device 13. Therefore, when the spun yarn 7 breaks, the portion near the yarn end 7t tends to be deformed in a certain direction by the influence of the torque of twisting.

At the time point t1, the yarn end 7t is in a free state in the vicinity of the most upstream portion 80 as shown by reference numeral 7a in fig. 3. The yarn end 7a in the free state is highly likely to come into contact with the spun yarn 7 remaining in the state of being wound around the storage portion 41a as indicated by reference numeral 7b due to the above-described influence of the torque.

When the yarn end 7t in the state shown by reference numeral 7b is entangled with the spun yarn 7 wound around the yarn accumulating roller 41, the tension fluctuates and/or the yarn is broken. Alternatively, there are cases where: the yarn that causes the spun yarn 7 on the yarn accumulating roller 41 to be entangled into a lump and to be once disengaged is looped off, resulting in an unwinding error in the unwinding of the spun yarn 7 from the yarn accumulating roller 41.

As one method for preventing the yarn end 7a from being entangled with the spun yarn 7 wound around the yarn accumulating roller 41, it is also conceivable to swing the yarn end 7a by centrifugal force. Therefore, in the process of drawing and unwinding the spun yarn 7 downstream from the yarn accumulating roller 41, the yarn accumulating roller 41 may be rotated in the normal rotation direction at a certain speed. However, when the yarn accumulating roller 41 is rotated when the spun yarn 7 is unwound from the yarn accumulating roller 41 toward the downstream side, the strength of the twist of the spun yarn 7 between the yarn accumulating roller 41 and the winding device 21 is unexpectedly changed.

In this regard, in the present embodiment, first, the yarn accumulating roller 41 is rotated in the reverse direction, and the suction device 49 is caused to catch the free yarn end 7 a. Thereby, the yarn end 7a is separated from the yarn accumulating roller 41 as shown by reference numeral 7 c. Thereafter, the yarn accumulating roller 41 is slightly rotated in the normal rotation direction while continuing the suction of the spun yarn 7 by the suction device 49. Thereby, the slack of the spun yarn 7 between the suction device 49 and the yarn accumulating roller 41 is eliminated, and the spun yarn 7 is guided from the suction port 71 to the most upstream portion 80 via the yarn introducing portion 79. Further, the spun yarn 7 is wound around the outer peripheral surface of the yarn accumulating roller 41 by the rotation of the yarn accumulating roller 41 in the normal rotation direction.

According to the above, the spun yarns 7 wound around the yarn accumulating roller 41 are regularly arranged on the accumulating portion 41 a. Therefore, by rotating the package 9 in the normal rotation direction while the rotation of the yarn accumulating roller 41 is stopped, the spun yarn 7 can be unwound from the yarn accumulating roller 41 in a regular spiral shape one turn and conveyed to the downstream side. After (or almost at the same time as) the last turn of the spun yarn 7 is unwound from the yarn accumulating roller 41, the yarn end 7c is disengaged from the suction port 71 of the suction device 49. Therefore, entanglement of the yarn end 7t can be reliably prevented.

In the present embodiment, the yarn end 7t of the spun yarn 7 is restrained by causing the suction flow formed by the suction device 49 to act on the spun yarn 7. Since the air flow is used for the restraint, the vicinity of the yarn end 7t, which is unstable in behavior, can be flexibly restrained. Further, the yarn end 7t of the spun yarn 7 can be easily controlled by the air flow.

The structure for restraining the yarn end 7t of the spun yarn 7 using the air flow as in the present embodiment has an advantage that dirt such as lint is less likely to adhere to the structure in which the member(s) (for example, a plate-shaped guide described later) is (are) brought into contact with the spun yarn 7 to restrain the spun yarn.

In the present embodiment, the 1 st valve 77 is controlled by the unit controller 25 to be opened only when the spun yarn 7 is cut off on the upstream side of the yarn accumulating device 17. However, the 1 st valve 77 may be opened at a time other than the above-described time. The 1 st valve 77 may be omitted, and the suction device 49 may always generate suction flow. The suction device 49 can be used not only for restraining the yarn end 7t when the spun yarn 7 is cut on the upstream side of the yarn accumulating device 17 but also for other purposes.

A plate-like guide for guiding the spun yarn 7 may be disposed on the upstream side of the yarn accumulating roller 41 and on the downstream side of the yarn monitoring device 15 separately from the suction device 49. The plate-like guide may be formed of a plate-like member, for example. The plate-like guide member guides: the spun yarn 7 is guided to the yarn introducing portion 79 of the yarn accumulating roller 41 by being in contact with the spun yarn 7.

When the spun yarn 7 is partially broken in the spinning device 13, for example, the behavior of the yarn end 7t of the spun yarn 7 on the package 9 side becomes unstable. The plate-like portion of the plate-like guide prevents the yarn end 7t from irregularly moving toward the yarn accumulating roller 41. By this restriction, the yarn end 7t of the spun yarn 7 is prevented from being entangled with the flyer 45, for example. As shown in fig. 4, after the spun yarn 7 is broken, the yarn accumulating roller 41 continues to rotate in the normal rotation direction. At this time, the plate-like guide urges the yarn end 7t to pass through the plate-like guide finally and be wound around the yarn accumulating roller 41 in the spun yarn 7 on the package 9 side.

The plate-like guide is in contact with the spun yarn 7 to guide the spun yarn. Therefore, when the spun yarn 7 is broken on the upstream side of the yarn accumulating device 17, the plate-like guide provides a resistance force against the progress of the spun yarn 7 when the spun yarn 7 is wound by rotating the yarn accumulating roller 41 in the forward direction as described above. As a result, tension is applied to the spun yarn 7 between the yarn accumulating roller 41 and the plate-like guide, and therefore the spun yarn 7 is stably guided to the yarn introducing section 79. Therefore, the yarn end 7t of the spun yarn 7 is wound around the yarn accumulating roller 41 in order.

The plate-like guide may be disposed near the outer periphery of the yarn accumulating roller 41.

Next, control related to the operation of the yarn removing lever 51 shown in fig. 1 will be described.

In the present embodiment, the yarn removing lever 51 performs the yarn removing operation when the unwinding of the spun yarn 7 from the yarn accumulating roller 41 is completed. Hereinafter, this yarn removing operation may be referred to as a 1 st yarn removing operation. The time point of the first yarn removal operation 1 is after the time point when the yarn end 7t of the spun yarn 7 is separated from the yarn accumulating roller 41. The time point at which the 1 st yarn removal operation is performed may be referred to as a 1 st time point.

The first yarn removal operation 1 will be specifically described. The unit controller 25 controls the winding device 21 so that the rotation of the package 9 is stopped when it is determined that the unwinding of the spun yarn 7 from the yarn accumulating roller 41 is completed. At substantially the same time point as the stop of the rotation of the package 9, the unit controller 25 controls the yarn accumulating device 17 so that the yarn removing lever 51 moves from the standby position to the yarn removing position.

Immediately after the spun yarn 7 wound around the yarn accumulating roller 41 is completely unwound, the yarn end 7t of the spun yarn 7 on the package 9 side passes near the flyer 45 and passes downstream while being separated from the yarn accumulating roller 41. In this process, there is a possibility that the free yarn end 7t or its vicinity comes into contact with the flyer 45 to be entangled. In this case, in the present embodiment, by performing the above-described first yarn removal operation, the yarn end 7t or its vicinity can be removed from the flyer 45. The moving time of the yarn removing lever 51 is not particularly limited, and may be any time as long as it is a time before the yarn joining by the yarn joining device 19.

The first yarn removal operation is not necessarily required. For example, a sensor for detecting whether or not the spun yarn 7 is entangled with the flyer 45 may be provided, and the first yarn removing operation 1 may be performed only when the sensor detects entanglement of the spun yarn 7. Alternatively, the 1 st yarn removal operation may be omitted. In the present embodiment, the 1 st yarn removing operation is performed at a time point when the spun yarn 7 is supposed to be completely unwound from the yarn accumulating roller 41, and it is not known whether or not the spun yarn 7 is actually unwound from the yarn accumulating roller 41.

An operation stroke (1 st operation amount) of the yarn removing lever 51 for performing the 1 st yarn removing operation is different from an operation stroke (2 nd operation amount) of the yarn removing lever 51 for performing the 2 nd yarn removing operation described later in other cases. In other words, the yarn removal position for the flyer 45 differs between the two cases.

In another case, for example, the spun yarn 7 from the yarn feeding device 23 is guided to the yarn joining device 19 by the guide device 57 in a series of yarn joining operations after the spun yarn 7 is cut. At this time, the spun yarn 7 guided by the guide device 57 is hooked on the rotating flyer 45, and the winding of the spun yarn 7 on the yarn accumulating roller 41 is started. After the spun yarn 7 of a predetermined amount (length) is wound around the yarn accumulating roller 41, the unit controller 25 moves the yarn removing lever 51 from the standby position to the yarn removing position. Hereinafter, this yarn removing operation may be referred to as a 2 nd yarn removing operation. Thus, the spun yarn 7 can be detached from the flyer 45, and the spun yarn 7 wound around the yarn accumulating roller 41 at the start of spinning can be sucked and removed by the guide device 57. Thereafter, the yarn removing lever 51 returns to the standby position again, whereby the spun yarn 7 is hooked on the flyer 45 and wound around the yarn accumulating roller 41. Thereafter, the spun yarn 7 is spliced by the yarn splicing device 19 to the spun yarn 7 on the package 9 side which has been prepared by the catching device 83. Hereinafter, the time point at which the 2 nd yarn removal operation is performed may be referred to as a 2 nd time point. The 2 nd time point is different from the 1 st time point described above.

In the case where the flyer 45 comes into contact with the vicinity of the free yarn end 7t, entanglement of the flyer 45 with the spun yarn 7 is more likely to occur than in the case where the flyer is brought into contact with the middle portion of the spun yarn 7. Therefore, in the present embodiment, the 1 st operation amount is set to be larger than the 2 nd operation amount. In other words, the yarn cutting position in the case of the 1 st yarn cutting operation is a position separated from the flyer 45, compared to the yarn cutting position in the case of the 2 nd yarn cutting operation. Thus, even if the yarn end 7t is entangled with the flyer 45, the yarn end 7t can be reliably removed from the flyer 45 by the yarn removal rod 51.

Next, a process of the yarn end of the spun yarn 7 on the package 9 side, which is performed after the spun yarn 7 is cut between the yarn feeding device 23 and the yarn accumulating device 17 and the spun yarn 7 is unwound from the yarn accumulating roller 41, will be described.

As shown in fig. 5, the spinning unit 1 includes a detection device 81 capable of detecting the yarn end 7t of the spun yarn 7 on the package 9 side. The detection device 81 can detect the yarn end 7t located between the yarn accumulating device 17 and the winding device 21 after unwinding from the yarn accumulating roller 41. In the present embodiment, the detection device 81 is a sensor disposed downstream of the yarn accumulating roller 41 in the yarn running direction. The detecting device 81 is disposed closer to the yarn accumulating device 17 than the winding device 21 in the yarn running direction.

In the present embodiment, the detection device (sensor) 81 is an optical reflection type sensor. The structure of the detection device 81 is arbitrary, and for example, the detection device 81 may be an electrostatic capacitance type proximity sensor or a transmission type sensor.

The detection device 81 is disposed downstream of the guide 55. Specifically, the detection device 81 is disposed between the guide 55 and the yarn joining device 19 in the yarn running direction. The detection device 81 is disposed near the guide 55. The guide 55 guides the path of the spun yarn 7 in the vicinity of the detection device 81.

When the spun yarn 7 is wound around the yarn accumulating roller 41 and tensioned between the guide 55 and the winding device 21, the spun yarn 7 is present along a path (a part of a yarn running path) 111 of the spun yarn 7 indicated by a two-dot chain line in fig. 5. The detection device 81 is disposed to face an appropriate position on the path 111 of the spun yarn 7, and detects whether or not the spun yarn 7 is present at the position.

Therefore, when the spun yarn 7 is in a continuous state between the yarn feeding device 23 and the winding device 21, the spun yarn 7 exists along the path 111, and therefore the detection device 81 detects the existence of the spun yarn 7. When the yarn end 7t of the spun yarn 7 on the package 9 side is located on the downstream side of the detection device 81 after the spun yarn 7 is broken, the detection device 81 does not detect the spun yarn 7.

Even when the yarn end 7t of the spun yarn 7 on the package 9 side is located on the upstream side of the detection device 81, the detection device 81 does not detect the spun yarn 7 when the spun yarn 7 is not wound around the yarn accumulating roller 41. The reason is that the spun yarn 7 that cannot maintain the tension is drawn into the catching device 83 described later by being separated from the path 111. In this way, the detection device 81 detects the presence or absence of the spun yarn 7 in the path 111 of the spun yarn 7, and detects the presence or absence of the yarn end 7t between the yarn accumulating roller 41 and the winding device 21.

The detection device 81 may be disposed at a position where the operation of the spun yarn 7 is stable. The detection device 81 may be disposed at any position in a region facing the yarn accumulating roller 41 and downstream of the axial center portion of the yarn accumulating roller 41, or may be disposed in the vicinity of the suction device 49 (at a position adjacent to the yarn accumulating roller 41 in a direction intersecting the axial direction of the yarn accumulating roller 41). The yarn end 7t of the spun yarn 7 on the package 9 side detected by the detection device 81 does not only indicate a portion of the spun yarn 7 where the spun yarn 7 is completely completed, but also includes the portion and a region in the vicinity thereof.

The spinning unit 1 includes a catching device 83 for catching the spun yarn 7 on the downstream side of the yarn accumulating roller 41. The catching device 83 is disposed between the yarn accumulating device 17 and the winding device 21 in the yarn running direction. In the present embodiment, as shown in fig. 1, the catching device 83 is disposed between the yarn accumulating device 17 and the yarn splicing device 19 in the yarn running direction and in the vicinity of the detecting device 81. The catching device 83 is disposed closer to the yarn accumulating device 17 than the winding device 21 in the yarn running direction.

The catching device 83 sucks and catches the yarn end 7t of the spun yarn 7 on the package 9 side when the spun yarn 7 is cut off on the upstream side in the yarn running direction from the yarn accumulating device 17. When the yarn end 7t is sucked and caught, the catching device 83 may not first suck the portion of the yarn end 7t where the spun yarn 7 is completely completed. In other words, there are also cases where: the catching device 83 first sucks the portion of the spun yarn 7 near the yarn end 7t and continues the suction, and as a result, the yarn end 7t is sucked.

The catcher 83 includes a pipe 85. In the present embodiment, the trap 83 further includes an air suction device 87, and the air suction device 87 generates a suction air flow by being supplied with compressed air.

The tube 85 has a cylindrical shape. The tube 85 is connected to a suction source 75 as a negative pressure source. Therefore, the trap device 83 can generate a suction airflow inside the pipe 85. An air suction device 87 is provided at one end in the longitudinal direction of the pipe 85. The air suction device 87 has a catching opening 89 for sucking the yarn end 7t of the spun yarn 7 on the package 9 side. The catching opening 89 is disposed so as to open toward a yarn path (a path 111 of the spun yarn 7 in fig. 5) formed between the yarn accumulating device 17 and the winding device 21. The relative position of the catching opening 89 with respect to the yarn path is not particularly limited, and may be downstream of the yarn accumulating roller 41 and in the vicinity of the yarn path. In the present embodiment, the catching opening 89 is fixedly provided in the spinning unit 1.

The air intake device 87 is supplied with compressed air generated by a compressed air source 91. The air intake device 87 discharges compressed air from an unillustrated discharge hole, and the capture opening 89 can generate an additional suction airflow in addition to the suction airflow generated by the suction source 75. A 2 nd valve 93 is provided in a middle portion of a compressed air supply path connecting the intake device 87 and the compressed air source 91. The 2 nd valve 93 is an electromagnetic valve for switching whether or not to supply the compressed air to the air suction device 87. The opening and closing of the 2 nd valve 93 is controlled by the unit controller 25. The suction air flow is generated in the suction device 87 (the trap 83) by opening the 2 nd valve 93, and the suction air flow in the suction device 87 is stopped by closing the 2 nd valve 93.

As described above, in the present embodiment, the trap 83 includes the suction device 87. Thus, in the catching device 83, the strong suction airflow is generated in the catching opening 89 by the flow of the air generated by the air injection, and the yarn end 7t of the spun yarn 7 on the package 9 side can be sucked and reliably held. The catching device 83 may be configured to catch the yarn end 7t of the spun yarn 7 on the package 9 side by a sufficiently strong suction force, and the air suction device 87 may not be necessarily provided.

The timing at which the catching device 83 operates the air suction device 87 to catch the yarn end 7t of the spun yarn 7 on the package 9 side is not particularly limited. For example, the unit controller 25 may operate the air suction device 87 at a time point when it is determined that the amount of the spun yarn 7 remaining in the yarn accumulating roller 41 is less than a predetermined amount. The amount of the spun yarn 7 remaining in the yarn accumulating roller 41 can be determined based on the detection result of the yarn detection sensor 47.

In the present embodiment, when the spun yarn 7 on the package 9 side is wound into the package 9, the unit controller 25 controls the rotation of the package 9. Specifically, the following is performed. By the rotation in the normal rotation direction of the package 9, the spun yarn 7 (the spun yarn 7 on the package 9 side) is unwound from the yarn accumulating roller 41 to the downstream side as described above. Immediately after the time point when the yarn end 7t of the spun yarn 7 is separated from the yarn accumulating roller 41 by unwinding of the spun yarn 7 from the yarn accumulating roller 41, the yarn end 7t of the spun yarn 7 is caught by the catching device 83. As a result, if the detection device 81 does not detect the spun yarn 7, the unit controller 25 stops the rotation of the package 9 in the normal rotation direction. By this control, the rotation in the normal rotation direction of the package 9 can be stopped before the yarn end 7t is completely wound around the package 9.

The package 9 is then temporarily rotated in the reverse rotation direction. Thereby, a part of the spun yarn 7 is unwound from the package 9 and sucked by the catching device 83. The spun yarn 7 sucked by the catching device 83 is discarded in the process of being spliced by the yarn splicing device 19. How much the package 9 is rotated in the reverse rotation direction is adjusted according to the length of the yarn defect included in the spun yarn 7 detected by the yarn monitoring device 15. Accordingly, when the yarn defect included in the spun yarn 7 on the package 9 side is short, the rotation amount in the reverse rotation direction of the package 9 is small, so that the length of the spun yarn 7 sucked and removed by the catcher 83 can be shortened, and the amount of the spun yarn 7 to be discarded can be small.

When the package 9 is rotated in the reverse rotation direction for a while, if the suction force of the catching device 83 is insufficient, the spun yarn 7 on the side of the package 9 may not be unwound and may stick to the surface of the package 9 without being separated therefrom. When the package 9 is rotated in the reverse rotation direction in this state, the spun yarn 7 is wound in a reverse direction opposite to the normal direction. The reverse winding causes a failure of the yarn joining process by the yarn joining device 19 and a deterioration in the quality of the package 9. However, in the present embodiment, the spun yarn 7 can be strongly sucked and pulled from the catching opening 89 by operating the air suction device 87 in the catching device 83. As a result, the occurrence of reverse winding can be prevented.

In the present embodiment, the 1 st injection device 97 is provided downstream of the yarn accumulating roller 41. The 1 st jet device 97 is disposed at a position facing the catching device 83 (catching opening 89) with the path 111 of the spun yarn 7 therebetween. In other words, the 1 st jetting device 97 and the trap device 83 (the trap opening 89) are arranged on a straight line. Therefore, the 1 st injection device 97 can inject air to the trap 83 (trap opening 89). The air ejected from the 1 st ejection device 97 flows toward the capturing opening 89 of the capturing device 83 in the direction of the arrow 99 in fig. 5. Accordingly, the vicinity of the yarn end 7t of the spun yarn 7 on the package 9 side is blown off to the catching opening 89, and therefore the yarn end 7t can be caught by the catching device 83 more reliably. The timing at which the 1 st injection device 97 performs injection is not particularly limited. This time point may be, for example, a time point at which the yarn detection sensor 47 does not detect the spun yarn 7, that is, a time point at which the spun yarn 7 is immediately disappeared from the yarn accumulating roller 41, or a time point at which the catching device 83 operates the air suction device 87.

The compressed air generated by the compressed air source 101 is supplied to the 1 st injection device 97. The 1 st jet device 97 jets the compressed air from the jet hole toward the path 111 of the spun yarn 7 (the catching opening 89 of the catching device 83). A 3 rd valve 103 is provided in a middle portion of a compressed air supply path connecting the 1 st injection device 97 to the compressed air source 101. The 3 rd valve 103 is an electromagnetic valve for switching whether or not compressed air is supplied to the 1 st injection device 97. The 3 rd valve 103 is controlled to open and close by the unit controller 25. The compressed air is injected from the 1 st injection device 97 by performing control for opening the 3 rd valve 103, and the injection of the compressed air is stopped by performing control for closing the 3 rd valve 103. Alternatively, the spinning unit 1 may be configured to supply compressed air from a single compressed air source without providing the compressed air source 101 and the compressed air source 91 separately.

In the present embodiment, as shown in fig. 1, the 2 nd injection device 105 is provided on the downstream side of the 1 st injection device 97. The 2 nd jet device 105 is fixedly installed in the spinning unit 1 or a working carriage not shown. When the spun yarn 7 is cut off between the yarn accumulating device 17 and the winding device 21 in the yarn running direction, the 2 nd jet device 105 jets compressed air to guide the yarn end 7t of the spun yarn 7 on the package 9 side toward the catching device 83. The 2 nd injection device 105 can be configured similarly to the 1 st injection device 97. Accordingly, when the spun yarn 7 is cut off on the downstream side in the yarn feeding direction from the yarn accumulating device 17 due to a failure of yarn splicing in the yarn splicing device 19 or the like, the package 9 is rotated in the reverse direction and the compressed air is ejected from the 2 nd ejection device 105, whereby the catching device 83 can catch the yarn end 7t of the spun yarn 7 on the package 9 side. As a result, the yarn end 7t of the spun yarn 7 is guided to a position where the yarn joining by the yarn joining device 19 is possible. Therefore, the processing of the spun yarn 7 on the package 9 side can be performed with a simple configuration. At the same time or almost the same time as the start of the ejection of the compressed air from the 2 nd ejection device 105, the package 9 is rotated in the reverse rotation direction by the winding device 21. Further, the 2 nd injection device 105 may be omitted.

As described above, the spinning unit 1 provided in the spinning machine of the present embodiment includes the yarn feeding device 23, the winding device 21, and the yarn accumulating device 17. The yarn feeding device 23 can feed the spun yarn 7. The winding device 21 winds the spun yarn 7 supplied from the yarn feeding device 23 to form a package 9. The yarn accumulating device 17 is disposed in the middle of a yarn path (yarn path) formed between the yarn feeding device 23 and the winding device 21. The yarn accumulating device 17 has a yarn accumulating roller 41 and a suction device 49. The yarn accumulating roller 41 winds and accumulates the spun yarn 7 supplied from the yarn supplying device 23. When the spun yarn 7 is cut off on the upstream side in the yarn running direction from the yarn accumulating device 17, the suction device 49 causes air to act on the yarn end 7t of the spun yarn 7 on the package 9 side, thereby restraining the yarn end 7t of the spun yarn 7 on the package 9 side with respect to the upstream side end portion area of the yarn accumulating roller 41. After the spun yarn 7 is cut, the action on the spun yarn 7 by the air is performed by the suction device 49, and the package 9 is rotated in the normal rotation direction (the time point t5 in fig. 4 or less) in which the spun yarn 7 is wound by the winding device 21, so that the spun yarn 7 remaining on the yarn accumulating roller 41 is unwound from the yarn accumulating roller 41. The yarn end 7t of the spun yarn 7 on the package 9 side stops rotating in the normal rotation direction of the package 9 continuously from the time point t5 at the time point before being wound around the package 9 by being separated from the yarn accumulating roller 41.

Accordingly, after the upstream side spun yarn 7 in the yarn running direction from the yarn accumulating device 17 is cut, the spun yarn 7 on the package 9 side can be appropriately processed with a simple configuration. The yarn end 7t of the spun yarn 7 on the package 9 side can be reliably restrained by air.

The spinning machine of the present embodiment includes the 1 st valve 77 and the unit controller 25. The 1 st valve 77 switches between the generation and the stop of the air flow formed by the suction device 49. The unit controller 25 controls the 1 st valve 77.

This enables the suction device 49 to generate an air flow only when necessary, thereby saving energy.

In the spinning machine of the present embodiment, when the spun yarn 7 is cut off on the upstream side in the yarn running direction from the yarn accumulating device 17, the suction device 49 is operated to restrain the yarn end 7t (7a) of the spun yarn 7 on the package 9 side with respect to the upstream end portion area of the yarn accumulating roller 41. The suction device 49 has a suction port 71 facing the yarn accumulating roller 41, and sucks the yarn end 7t (7a) of the spun yarn 7 remaining on the yarn accumulating roller 41 through the suction port 71.

Thus, the yarn end 7t (7a) of the spun yarn 7 remaining on the yarn accumulating roller 41 is sucked, whereby the behavior of the spun yarn 7 can be stabilized. As a result, the spun yarn 7 remaining on the yarn accumulating roller 41 is easily unwound because the yarn end 7t is not entangled with the spun yarn 7.

In the spinning machine of the present embodiment, the yarn accumulating roller 41 of the yarn accumulating device 17 includes the yarn introducing section 79, and the yarn introducing section 79 is disposed upstream of the most upstream section 80 where the spun yarn 7 is wound around the outer peripheral surface of the yarn accumulating roller 41. The spun yarn 7 supplied from the yarn feeding device 23 is guided to the most upstream part 80 of the yarn accumulating roller 41 through the yarn introducing part 79. The suction port 71 of the suction device 49 is disposed toward the yarn introducing portion 79.

Thereby, the yarn end 7t (7a) of the spun yarn 7 remaining on the yarn accumulating roller 41 can be reliably sucked through the suction port 71 of the suction device 49.

In the spinning machine of the present embodiment, the yarn accumulating roller 41 is rotated in the normal rotation direction, which is the direction in which the spun yarn 7 from the upstream is wound, and accumulates the spun yarn 7. When the spun yarn 7 is cut on the upstream side in the yarn running direction from the yarn accumulating device 17, the rotation of the package 9 and the yarn accumulating roller 41 in the normal rotation direction is stopped. After the package 9 and the yarn accumulating roller 41 stop rotating in the normal rotation direction, the yarn accumulating roller 41 rotates in the reverse rotation direction.

Thus, the yarn end 7t (7a) of the spun yarn 7 remaining on the yarn accumulating roller 41 is unwound upstream by the reverse rotation of the yarn accumulating roller 41. Therefore, the yarn end 7t can be more reliably sucked through the suction port 71 of the suction device 49.

In the spinning machine of the present embodiment, after the yarn accumulating roller 41 rotates in the reverse direction, the yarn accumulating roller 41 rotates in the normal direction.

Thus, by rotating the yarn accumulating roller 41 in the normal rotation direction in a state where the spun yarn 7 is sucked by the suction port 71, the wrapping action on the yarn accumulating roller 41 is generated by the spun yarn 7 continuing between the package 9 and the yarn accumulating roller 41, and the spun yarn 7 remaining on the yarn accumulating roller 41 can be aligned. Therefore, the spun yarn 7 remaining on the yarn accumulating roller 41 can be smoothly unwound from the yarn accumulating roller 41.

In the spinning machine of the present embodiment, the rotation amount when the yarn accumulating roller 41 rotates in the normal direction after rotating in the reverse direction is smaller than the rotation amount when the yarn accumulating roller 41 rotates in the reverse direction.

This prevents the yarn end 7t (7c) sucked by the suction port 71 of the suction device 49 when the yarn accumulating roller 41 rotates in the reverse direction from being separated from the suction port 71 when the yarn accumulating roller 41 rotates in the normal direction. Therefore, the action by the suction device 49 can be continued.

In the spinning machine of the present embodiment, the yarn accumulating device 17 includes a flyer 45 and a yarn take-off rod 51. The flyer 45 rotates relative to the yarn accumulating roller 41. The spun yarn 7 drawn out from the yarn accumulating roller 41 is hooked to the flyer 45. The yarn removing lever 51 performs a yarn removing operation of removing the yarn path from the flyer 45 at the 1 st time point, which is a time point after the time point at which the yarn end 7t of the spun yarn 7 (the spun yarn 7 on the package 9 side) from the yarn accumulating roller 41 is separated from the yarn accumulating roller 41.

Thus, even when the yarn end 7t of the spun yarn 7 from the yarn accumulating roller 41 is entangled with the flyer 45 when the yarn end 7t is separated from the yarn accumulating roller 41, the yarn end 7t can be removed from the flyer 45 by the yarn removing rod 51.

In the spinning machine of the present embodiment, the yarn removing lever 51 is configured to perform the yarn removing operation also at the 2 nd time point different from the 1 st time point. The 1 st operation amount of the yarn removal lever 51 related to the yarn removal operation performed at the 1 st time point is different from the 2 nd operation amount of the yarn removal lever 51 related to the yarn removal operation performed at the 2 nd time point.

Thus, even if the yarn end 7t is entangled with the flyer 45 when the yarn end 7t of the spun yarn 7 from the yarn accumulating roller 41 is separated from the yarn accumulating roller 41, the yarn end 7t can be reliably removed from the flyer 45 by a yarn removing operation different from the other yarn removing operations.

In the spinning machine of the present embodiment, the yarn feeding device 23, the winding device 21, and the yarn accumulating device 17 are provided in each of the plurality of spinning units 1.

This makes it possible to easily use the yarn feeding device 23, the winding device 21, and the yarn accumulating device 17.

In the spinning machine of the present embodiment, each of the plurality of spinning units 1 includes a driving section of the winding device 21. In the case where the winding device 21 includes the winding drum 63 having the traverse groove, the driving section is a winding drum driving motor. In the case where the winding device 21 includes a winding drum having no traverse groove and a traverse guide that is provided independently of the winding drum and reciprocates, the driving sections are a winding drum driving motor and a traverse guide driving motor.

This enables control of driving and stopping the winding device 21 independently for each spinning unit 1.

In the spinning machine of the present embodiment, each of the plurality of spinning units 1 includes a driving section for the yarn removal lever 51.

Thus, unlike the conventional art, the control of independently operating the yarn removing lever 51 for each spinning unit 1 is possible.

The spinning method according to the present embodiment is performed by the spinning unit 1 including the yarn feeding device 23, the winding device 21, and the yarn accumulating device 17. The yarn feeding device 23 can feed the spun yarn 7. The winding device 21 winds the spun yarn 7 supplied from the yarn feeding device 23 to form a package 9. The yarn accumulating device 17 is disposed in the middle of a yarn path (yarn path) formed between the yarn feeding device 23 and the winding device 21. The spinning machine performs spinning while rotating the package 9 in the normal rotation direction, which is the direction in which the spun yarn 7 is wound. The yarn accumulating device 17 has a yarn accumulating roller 41 and a suction device 49. The yarn accumulating roller 41 can wind and accumulate the spun yarn 7 supplied from the yarn supplying device 23. When the spun yarn 7 is cut off on the upstream side in the yarn running direction from the yarn accumulating device 17, the suction device 49 causes air to act on the yarn end 7t of the spun yarn 7 on the package 9 side, thereby restraining the yarn end 7t of the spun yarn 7 on the package 9 side with respect to the upstream end portion area of the yarn accumulating roller 41. After the spun yarn 7 is cut, the suction device 49 causes air to act on the spun yarn 7, and the winding device 21 rotates the package 9 in the normal rotation direction (after time t5 in fig. 4), so that the spun yarn 7 remaining on the yarn accumulating roller 41 is unwound from the yarn accumulating roller 41. At a time point before the yarn end 7t of the spun yarn 7 on the package 9 side departs from the yarn accumulating roller 41 and is wound into the package 9, the rotation in the normal rotation direction of the package 9 continued from the time point t5 is stopped.

Accordingly, after the spun yarn 7 on the upstream side in the yarn running direction from the yarn accumulating device 17 is cut, the spun yarn 7 on the package 9 side can be appropriately processed.

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

Instead of the suction device 49, a jet device (yarn acting portion) for jetting air around the yarn accumulating roller 41 may be provided. The jet device may be configured to jet air on the peripheral surface of the yarn accumulating roller 41. The injection device may be configured to inject air in a tangential direction of the yarn accumulating roller 41 in the most upstream portion 80, for example. The air ejection direction may be the same as or different from the direction of the suction air flow at the suction port 71 shown in fig. 3. The spun yarn 7 on the package 9 side is blown off along the jet flow at a portion on the upstream side of the yarn accumulating roller 41. Therefore, the yarn end 7a in the free state can be prevented from coming into contact with the spun yarn 7 already wound around the accumulating portion 41 a. In this way, the injection device can substantially restrain the spun yarn 7. By ejecting the air from the ejection device, it is also possible to provide a resistance force against the traveling of the spun yarn 7 toward the yarn accumulating roller 41. Similarly to the suction device 49, a 1 st valve 77 may be provided between the compressed air source and the opening of the injection device, and the opening and closing of the 1 st valve 77 may be controlled by the unit controller 25.

Instead of the suction device 49, an appropriate clamping device (yarn acting portion) configured to be able to clamp the yarn end 7t of the spun yarn 7 on the package 9 side may be provided. The spun yarn 7 may be held between the arms arranged in pairs, or may be held between the rollers arranged in pairs. The clamping device can restrain the spun yarn 7 from moving by clamping the spun yarn 7. For example, by providing a damper on the shaft of the roller, it is possible to provide a resistance force against the traveling direction of the spun yarn 7 toward the yarn accumulating roller 41.

When a roller pair is provided as the yarn acting portion, the roller pair may perform a drawing operation of drawing the spun yarn 7 from the spinning device 13. In this case, the yarn accumulating roller 41 accumulates the spun yarn 7 pulled out by the roller pair.

Instead of the suction device 49, a brush or comb teeth (yarn working section) to hook the spun yarn 7 may be provided. By hooking the spun yarn 7 to a brush or the like, the spun yarn 7 can be restrained from moving.

When the spinning unit 1 includes the above-described injection device, roller pair, brush, comb teeth, or the like as the yarn acting portion, the rotation of the yarn accumulating roller 41 for causing the suction port 71 of the suction device 49 to suck the spun yarn 7 in the reverse direction may be omitted. In this case, after the spun yarn 7 is cut off, the operation of the yarn acting section may not be stopped once by the rotation of the yarn accumulating roller 41 and/or the rotation of the package 9.

The detection device 81 may be a sensor provided on the outer peripheral surface of the yarn accumulating roller 41 at an end portion on the downstream side in the yarn running direction from the axial center portion of the yarn accumulating roller 41 and disposed to face the end portion. The sensor is disposed at a position facing the roller surface of the yarn accumulating roller 41 on the downstream side of the axial center portion with respect to the running yarn. When the spinning unit 1 includes a regulating mechanism for regulating the yarn path of the spun yarn 7 traveling from the yarn accumulating roller 41 through the flyer 45, the yarn path may be regulated by the regulating mechanism. The regulating means may be, for example, a member which is provided in the vicinity of the flyer 45 and can stop the rotation of the flyer 45 of the yarn accumulating device 17. The restriction mechanism restricts the yarn path, so that the yarn end 7t can be stably detected by the sensor.

The detection device 81 may also be a linear sensor. The linear sensor is disposed adjacent to the yarn accumulating roller 41 along the axial direction of the yarn accumulating roller 41. The linear sensor faces the outer peripheral surface of the storage portion 41 a. The linear sensor is provided with: a plurality of detecting elements arranged in a direction parallel to the axial direction of the yarn accumulating roller 41. The linear sensor is provided so as to be able to detect a position included in a region on the downstream side in the yarn running direction from the axial center portion of the yarn accumulating roller 41. If none of the detecting elements detects the spun yarn 7, it can be determined that the yarn end 7t has passed through the outer peripheral surface of the yarn accumulating roller 41.

The detection device 81 may be a sensor provided in the vicinity of the suction port 71 of the suction device 49. When all the spun yarn 7 is unwound from the yarn accumulating roller 41, the yarn end 7c is pulled out from the suction port 71. Therefore, by disposing the sensor in the vicinity of the suction port 71, the yarn end 7t (7c) can be stably detected.

In the above-described embodiment, when the yarn monitoring device 15 detects a yarn defect, the spinning in the spinning device 13 is stopped, and the spun yarn 7 is cut. Instead of this, the spun yarn 7 may be cut by a cutter provided upstream of the yarn accumulating device 17.

When a plurality of spinning units 1 are provided, instead of providing the yarn joining device 19 in each spinning unit 1, a configuration may be adopted in which a yarn joining carriage capable of traveling with respect to the plurality of spinning units 1 and stopping at a working position with respect to the spinning units 1 as necessary to join a yarn is provided.

In the above embodiment, the spinning unit 1 has a layout in which the yarn path formed between the yarn supplying device 23 and the winding device 21 extends from the bottom to the top. However, the present invention can also be applied to the spinning unit 1 in which the yarn path extends from the top to the bottom.

In the above-described embodiment, the spinning machine is an air spinning machine (air jet spinning machine), but may be a rotor spinning machine.

In the above-described embodiment, the yarn end 7t of the spun yarn 7 unwound from the yarn accumulating roller 41 is caught by the catching device 83. However, the spinning unit 1 may not include the catching device 83, and the devices may be controlled so that the yarn end 7t is stopped at an arbitrary position between the yarn accumulating roller 41 and the package 9.

In the case where the catching device 83 is not provided, the 1 st injection device 97 and/or the detection device 81 may be omitted. Even in the case where the catcher 83 is provided, the 1 st injection device 97 may be omitted.

In the above-described embodiment, the yarn accumulating roller 41 is rotated in the normal rotation direction after the yarn end 7t of the spun yarn 7 is sucked and caught by the suction device 49, but the rotation in the normal rotation direction may not be performed.

In the above embodiment, the spun yarn 7 on the package 9 side is spliced by the yarn splicing device 19 to the spun yarn 7 supplied from the yarn supplying device 23. However, the spun yarn 7 that has been cut may be again brought into a continuous state by a known piecing method.

Many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.

Claims (14)

1. A spinning machine is provided with:

a yarn feeding device capable of feeding a yarn;

a winding device that winds the yarn supplied from the yarn feeding device to form a package; and

a yarn accumulating device disposed in the middle of a yarn running path formed between the yarn feeding device and the winding device,

the spinning machine is characterized in that,

the yarn accumulating device comprises:

a yarn accumulating roller for winding and accumulating the yarn supplied from the yarn feeding device; and

a yarn acting section for restraining the yarn end of the yarn on the package side with respect to an upstream end portion region of the yarn accumulating roller by causing air to act on the yarn end of the yarn on the package side when the yarn is broken on an upstream side in the yarn feeding direction with respect to the yarn accumulating device,

after the yarn is cut, the yarn acting section performs an action on the yarn by air, and the package is rotated in a normal rotation direction, which is a direction in which the yarn is wound, by the winding device to unwind the yarn remaining in the yarn accumulating roller from the yarn accumulating roller,

the rotation of the package in the normal rotation direction is stopped at a time point before the yarn end of the yarn on the package side leaves the yarn accumulating roller and is wound into the package.

2. The spinning machine according to claim 1, comprising:

a direction change valve that switches between generation and stop of an air flow through the yarn acting section; and

a control device that controls the directional valve.

3. Spinning machine according to claim 1 or 2,

the yarn acting part is a suction device,

the suction device has a suction port opposed to the yarn accumulating roller, and sucks a yarn end of the yarn remaining on the yarn accumulating roller by using the suction port.

4. Spinning machine according to claim 3,

the yarn accumulating device includes a yarn introducing portion disposed upstream of a most upstream portion of an outer peripheral surface of the yarn accumulating roller around which the yarn is wound,

the yarn supplied from the yarn feeding device is guided to the most upstream part of the yarn accumulating roller through the yarn introducing part,

the suction port is disposed toward the yarn introduction portion.

5. Spinning machine according to claim 3 or 4,

the yarn accumulating roller accumulates the yarn by rotating in a normal rotation direction which is a direction in which the yarn from the upstream is wound,

when the yarn is cut on the upstream side of the yarn accumulating device in the yarn feeding direction, the rotation of the package and the yarn accumulating roller in the normal rotation direction is stopped,

after the package and the yarn accumulating roller stop rotating in the forward rotation direction, the yarn accumulating roller rotates in the reverse rotation direction.

6. Spinning machine according to claim 5,

after the yarn accumulating roller rotates in the reverse direction, the yarn accumulating roller rotates in the forward direction.

7. Spinning machine according to claim 6,

the amount of rotation of the yarn accumulating roller in the normal rotation direction after rotating in the reverse rotation direction is smaller than the amount of rotation of the yarn accumulating roller in the reverse rotation direction.

8. Spinning machine according to claim 1,

the yarn acting part is an injection device for injecting air around the yarn accumulating roller.

9. Spinning machine according to any one of claims 1 to 8,

the yarn accumulating device comprises:

a yarn hooking member that rotates relative to the yarn accumulating roller and hooks the yarn drawn out from the yarn accumulating roller; and

and a yarn removing means for performing a yarn removing operation for removing the yarn path from the yarn hooking means at a 1 st time point which is a time point after a time point at which the yarn end of the yarn on the package side is separated from the yarn accumulating roller.

10. Spinning machine according to claim 9,

the yarn removing means is configured to perform the yarn removing operation also at a 2 nd time point different from the 1 st time point,

a 1 st movement amount of the yarn removing member related to the yarn removing movement performed at the 1 st time point is different from a 2 nd movement amount of the yarn removing member related to the yarn removing movement performed at the 2 nd time point.

11. Spinning machine according to any one of claims 1 to 10,

the yarn feeding device, the winding device, and the yarn accumulating device are provided in a plurality of spinning units, respectively.

12. Spinning machine according to claim 11,

each of the plurality of spinning units includes a driving section of the winding device.

13. Spinning machine according to claim 11 or 12,

in each of the plurality of spinning units, the yarn accumulating device includes:

a yarn hooking member that rotates relative to the yarn accumulating roller and hooks the yarn drawn out from the yarn accumulating roller; and

a yarn removing means for performing a yarn removing operation for removing the yarn path from the yarn hooking means after a time point when the yarn end of the yarn on the package side is separated from the yarn accumulating roller,

each of the plurality of spinning units includes a driving portion of the yarn removing member.

14. A spinning method is executed by a spinning machine,

the spinning machine is provided with:

a yarn feeding device capable of feeding a yarn;

a winding device that winds the yarn supplied from the yarn feeding device to form a package; and

a yarn accumulating device disposed in the middle of a yarn running path formed between the yarn feeding device and the winding device,

the method for spinning is characterized in that,

the yarn accumulating device comprises:

a yarn accumulating roller for winding and accumulating the yarn supplied from the yarn feeding device; and

a yarn acting section for restraining the yarn end of the yarn on the package side with respect to an upstream end portion region of the yarn accumulating roller by causing air to act on the yarn end of the yarn on the package side when the yarn is broken on an upstream side in the yarn feeding direction with respect to the yarn accumulating device,

after the yarn is cut, the yarn acting section causes air to act on the yarn, and the winding device rotates the package in a normal rotation direction, which is a direction in which the yarn is wound, and unwinds the yarn remaining on the yarn accumulating roller from the yarn accumulating roller,

the rotation of the package in the normal rotation direction is stopped at a time point before the yarn end of the yarn on the package side leaves the yarn accumulating roller and is wound into the package.

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