CN114575006A - Spinning machine - Google Patents

Abstract

The invention provides a spinning machine, which can properly process yarn on a package side under the condition that the yarn on the upstream side of a yarn storage device in the yarn advancing direction is broken through a simple structure. The spinning machine is provided with a yarn feeding device (23), a winding device (21), a yarn storage device (17), a detection device (81), a catching device (83), and a first injection device (97). The yarn storing device is provided with a yarn storing roller (41) for storing the spun yarn (7) from the yarn feeding device. When the spun yarn is cut at the upstream side of the yarn accumulating device in the yarn traveling direction, the detecting device detects the yarn end (7t) of the spun yarn on the package (9) side. The catching device catches a yarn end of the spun yarn on the package side on a downstream side of the yarn accumulating device. The first injection device injects air toward the trapping device. The winding of the spun yarn on the package side is stopped based on the detection result of the detection device so that the yarn end of the spun yarn on the package side is stopped at a position where the yarn end can be caught by the catching device.

Description

Spinning machine

Technical Field

The invention relates to a spinning machine.

Background

Conventionally, a spinning machine including a yarn feeding device, a winding device, and a yarn accumulating device is known. Patent documents 1 and 2 each disclose such a spinning machine.

The spinning machine of patent document 1 includes a draft device, an air-jet spinning machine (yarn feeding device), a winding device for forming a package, and a yarn accumulating device having a yarn accumulating roller. The yarn accumulating roller is provided downstream of the spinning device (a part of the yarn feeding device) in the yarn running direction, and can temporarily accumulate the spun yarn by winding and rotating the spun yarn around the outer peripheral surface. The spinning machine includes a travel detection sensor disposed downstream of the yarn accumulating roller in a yarn travel direction. The travel detection sensor can detect at least one of whether the spun yarn travels on the yarn path and whether the spun yarn stops traveling, on the downstream side of the yarn accumulating roller.

The spinning machine of patent document 2 includes a draft device, an air-jet spinning machine (yarn feeding device), a winding device for generating a package, and a yarn accumulating device. The yarn storage roller provided in the yarn storage device can temporarily store the yarn fed from the air-jet spinning machine (a part of the yarn feeding device) by winding the yarn. The spinning machine includes a first suction device disposed downstream of the yarn accumulating roller in a yarn traveling direction. When the yarn is cut between the yarn storage device and the winding device in the yarn running direction (on the downstream side of the yarn storage device in the yarn running direction), the first suction device sucks the downstream end of the cut yarn in order to remove the cut yarn remaining on the yarn storage roller.

Patent document 1: japanese patent laid-open publication No. 2013-067891

Patent document 2: japanese patent laid-open publication No. 2019-108629

In the configurations of patent documents 1 and 2, when the yarn is cut on the upstream side of the yarn accumulating device in the yarn traveling direction, a part of the yarn on the winding device side can be wound into the package by the winding device. However, according to this structure, the yarn on the winding device side (the yarn on the package side) may not be appropriately processed. For example, if the yarn end of the yarn on the package side is completely wound in the package, the yarn end may not be appropriately pulled out from the package.

Disclosure of Invention

The purpose of the present invention is to provide a spinning machine capable of appropriately processing a yarn on a package side with a simple configuration when the yarn is cut off on the upstream side in the yarn advancing direction of a yarn accumulating device in the yarn advancing direction.

According to an aspect of the present invention, there is provided a spinning machine having the following configuration. That is, the spinning machine includes a yarn feeding device, a winding device, a yarn accumulating device, a detecting device, a catching device, and a first ejecting 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 a middle of a yarn running path formed between the yarn feeding device and the winding device. The yarn storing device includes a yarn storing roller for winding and storing the yarn supplied from the yarn supplying device. The detecting device detects a yarn end of the yarn on the package side when the yarn is cut on the upstream side of the yarn accumulating device in the yarn traveling direction. The catching device catches the yarn end of the yarn on the package side on a downstream side of the yarn accumulating device. The first injection device injects air toward the trapping device. Stopping the winding of the yarn on the package side based on the detection result of the detection device so that the yarn end of the yarn on the package side is stopped at a position where the yarn end can be caught by the catching device.

In the present specification, the case where the detecting device detects the yarn end of the yarn on the package side includes a case where a completely finished portion of the yarn is detected and a case where a region of the yarn near the finished portion of the yarn is detected.

In this way, the yarn end of the yarn on the package side is detected by the detection device, and thus the rotation of the package can be easily stopped at a position where the yarn end of the yarn on the package side can be caught by the catching device. Therefore, when the yarn is cut on the upstream side in the yarn traveling direction from the yarn accumulating device, the yarn on the package side can be handled with a simple configuration. The yarn end of the yarn on the package side can be guided toward the catching device by ejecting air from the first ejecting device. Therefore, the yarn end can be reliably caught by the catching device.

In the spinning machine, the detection device is preferably a sensor configured to detect an outer peripheral surface of the yarn accumulating roller.

This can stop the winding of the yarn on the package side at an appropriate timing.

In the spinning machine, the sensor is preferably a reflection-type sensor.

This makes it possible to easily detect the yarn end of the yarn on the package side.

The spinning machine may have the following configuration. That is, the detection device is a sensor configured to detect a downstream area of the yarn accumulating roller in the yarn traveling direction. The spinning machine further includes a regulating means. The regulating means regulates a yarn path of the yarn unwound from the yarn accumulating roller included in the yarn traveling path at a timing before the sensor detects the yarn end of the yarn on the package side.

In this case, the yarn end can be detected by the sensor in a state where the yarn running path of the yarn on the package side is stable. Therefore, the yarn end of the yarn on the package side can be reliably detected.

In the spinning machine, the detection device may be configured as a line sensor.

In this case, the yarn end of the yarn on the package side can be reliably detected.

In the spinning machine, the catching device preferably includes an air suction device that generates suction flow by supplying compressed air.

Thus, the yarn can be strongly sucked into the catching device by the flow of air generated by the jet air. Therefore, when the package is rotated in the reverse rotation direction to unwind the yarn from the package, the yarn on the package side can be prevented from being rewound in the direction opposite to the original direction with respect to the package.

In the spinning machine, the first injection device is preferably disposed on the opposite side of the yarn catching device with a part of the yarn travelling path therebetween.

This enables the yarn end to be reliably caught by the catching device.

The spinning machine preferably has the following configuration. That is, the trap device includes a tubular tube having a trap opening formed at a distal end thereof. The catching opening is fixedly provided. The tube is connected to a suction source.

Thus, a simple structure of the trap device can be realized.

The spinning machine preferably has the following configuration. That is, the spinning machine includes a guide member and a yarn detection sensor. The guide member is disposed downstream of the yarn accumulating roller and guides the yarn wound into the package. The yarn detection sensor is disposed downstream of the guide member, and detects the yarn wound into the package.

This enables the yarn to be reliably detected downstream of the guide member.

The spinning machine preferably has the following configuration. That is, the spinning machine includes a yarn splicing device. When the yarn is cut on the upstream side of the yarn accumulating device in the yarn advancing direction, the yarn splicing device performs a yarn splicing process of connecting the yarn at the yarn supplying device side and the yarn at the package side.

Thus, even when the yarn is cut on the upstream side of the yarn accumulating device in the yarn traveling direction, the yarn splicing process can be performed to restart the winding of the package.

In the spinning machine, the catching device is preferably disposed between the yarn storing device and the yarn splicing device in a yarn advancing direction, and is preferably disposed closer to the yarn storing device than the winding device in the yarn advancing direction.

Thus, when the yarn is cut on the upstream side of the yarn accumulating device in the yarn traveling direction, the yarn on the package side can be easily caught by the catching device located near the yarn accumulating device. Further, since the yarn on the package side is caught by the catching device between the yarn accumulating device and the yarn splicing device, the caught yarn on the package side can be smoothly spliced by the yarn splicing device.

The spinning machine preferably has the following configuration. That is, the spinning machine includes the second injection device. The second injection device injects air so as to guide the yarn end of the yarn on the package side toward the catching device when the yarn is cut off on the downstream side of the yarn accumulating device in the yarn advancing direction.

Thus, even if the yarn end of the yarn on the package side is located downstream of the catching device, the yarn on the package side can be pulled out from the package and caught by the catching device.

The spinning machine preferably has the following configuration. That is, the spinning machine includes a yarn monitoring device capable of detecting a yarn defect included in the yarn supplied from the yarn supplying device. When the yarn monitoring device detects a yarn defect, the yarn is cut on the upstream side of the yarn storage device in the yarn traveling direction. The winding device rotates the package in a direction opposite to a winding direction of the package after the yarn on the package side is caught by the catching device, and removes the yarn having a length necessary for removing the yarn defect from the caught yarn by the catching device.

Thus, the yarn defect detected by the yarn monitoring device can be reliably removed by the catching device.

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 weaving unit.

Fig. 3 is a diagram showing a positional relationship between a yarn accumulating roller and a suction device in the yarn accumulating 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 reference numerals:

1 … weaving unit; 7 … spun yarn (yarn); 9, 9 … rolling; 17 … yarn storage device; 19 … wiring device; 21 … coiling device; 23 … yarn feeding device; 55 … guide (guide member); 81 … detection means; 83 … catching means; 87 … air suction device; 97 … first injection means; 105 … second spray device.

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 of the yarn (specifically, the sliver 3, the fiber bundle 5, and the spun yarn 7) in the traveling direction (yarn traveling direction), respectively.

The spinning machine comprises at least one spinning unit 1 and a machine control device not shown in the figure. The machine control manages one or more textile units 1. The spinning unit 1 feeds the fiber bundle 5 to the downstream side in the yarn traveling direction by the draft device 11, spins the fiber bundle 5 fed from the draft device 11 by the spinning device 13 to generate the spun yarn 7, and winds the spun yarn 7 by the winding device 21 to form the package 9. In fig. 5, a cylindrical package 9 is illustrated, but the spinning machine may be configured such that the spun yarn 7 is wound around 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 storage device 17, a yarn splicing 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 splicing device 19, and the winding device 21 are arranged in this order from the upstream side toward the downstream side in the yarn travelling direction.

As shown in fig. 2, the above-described 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. In addition, at least one of the devices provided in the spinning unit 1 may be controlled by the machine control device. Alternatively, one unit controller may be provided for every predetermined number of the weaving 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 rotates the draft rollers in the draft direction while sandwiching the sliver 3 between the draft rollers and the opposed rollers opposed thereto, and feeds the sliver 3 to the downstream side, and stretches the sliver to a predetermined fiber amount (or thickness) to generate the fiber bundle 5.

The draft device 11 includes a rear roller 31, side rollers 33, an intermediate roller 35, and a front roller 37 as a plurality of draft rollers. The rollers 31, 33, 35, and 37 are arranged in this 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 generate a spun yarn (yarn) 7. In the present embodiment, an air type spinning device for twisting the fiber bundle 5 by a rotating 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 feeding the spun yarn 7. The spun yarn 7 generated by the yarn feeding device 23 travels from the yarn feeding device 23 toward the winding device 21. A yarn path (yarn running path) through which the spun yarn 7 runs is formed between the yarn feeding device 23 and the winding device 21.

A yarn monitor 15 is provided downstream of the spinning device 13. The yarn monitoring device 15 monitors the presence or absence and quality (thickness, presence or absence of foreign matter, and the like) of the spun yarn 7. The yarn monitoring device 15 performs non-contact monitoring using a transmission-type optical sensor. When detecting a yarn defect of the spun yarn 7 (for example, a portion where an abnormality occurs in the thickness of the spun yarn 7), the yarn monitoring device 15 transmits a yarn defect detection signal to the unit controller 25.

The unit controller 25 cuts the spun yarn 7 by stopping the spinning in the spinning device 13 upon receiving the yarn defect detection signal. The unit controller 25 stops the draft operation of the draft device 11 when stopping the spinning in the spinning device 13. Simultaneously with the cutting of the spun yarn 7 or at the time when a predetermined time has elapsed since the cutting of the spun yarn 7, the unit controller 25 stops the winding operation of the winding device 21 and the drawing operation of the yarn accumulating device 17.

The yarn monitoring device 15 is not limited to a transmissive optical sensor, and may monitor the presence or absence and quality of the spun yarn 7 by a capacitive sensor, for example. Instead of stopping the spun yarn 7 being cut, the spun yarn 7 may be cut by a cutting device provided near the yarn monitoring device 15.

A yarn storage 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 running path) formed between the yarn supplying 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 detecting sensor 47, a suction device (yarn acting portion) 49, and a yarn tail removing rod (yarn tail removing member) 51.

The yarn accumulating roller 41 can accumulate the spun yarn 7 supplied from the yarn supplying device 23. The spun yarn 7 is wound around the outer peripheral surface of the yarn accumulating roller 41 and accumulated. The yarn accumulating roller 41 is rotated in a normal rotation direction or a reverse rotation direction by a yarn accumulating motor 43. In the present embodiment, since a known pair of transport rollers 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.

The yarn accumulating motor 43 is configured as an electric motor capable of rotating forward and backward. The yarn accumulating motor 43 rotates the yarn accumulating roller 41 in the normal rotation direction by rotating in the normal rotation 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 so as to perform a drawing-out operation during normal spinning in the spinning unit 1.

The flyer 45 is attached to the downstream end (front end) of the yarn accumulating roller 41. The flyer 45 is provided to be able to contact the spun yarn 7 drawn out from the yarn storage roller 41. The flyer 45 is supported to be rotatable relative to the yarn storage roller 41. A permanent magnet is attached to either the flyer 45 or the yarn accumulating roller 41, and a hysteresis material is attached to the other. A torque is generated by the magnetic means against the relative rotation of the flyer 45 with respect to the storage roll 41. Therefore, in a state where the spun yarn 7 is caught by the flyer 45, only when a force that overcomes the above-described torque is applied to the flyer 45 (that is, when the spun yarn 7 is caught by a tension equal to or greater than a predetermined value), the flyer 45 can rotate relative to the yarn accumulating roller 41, and the spun yarn 7 wound around the yarn accumulating roller 41 is unwound. On the other hand, when the force against the torque is not caught by 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 increases, and to stop unwinding of the spun yarn 7 when the tension of the spun yarn 7 on the downstream side decreases (when the spun yarn 7 slackens). Thus, the yarn accumulating device 17 can eliminate the slack of the spun yarn 7 and apply an appropriate tension to the spun yarn 7. Further, by operating the flyer 45 so as to absorb the variation in the tension of the spun yarn 7 applied between the yarn accumulating device 17 and the winding device 21 as described above, it is possible to prevent the variation in the tension from affecting the spun yarn 7 from the spinning device 13 to the yarn accumulating device 17.

Instead of such a magnetic device, the yarn storage device 17 may be provided with an electromagnet instead of a permanent magnet. Alternatively, the yarn storage device 17 may be provided with a motor for rotationally driving the flyer 45, instead of the magnetic device.

The yarn detecting sensor 47 is a sensor for detecting the amount of stored yarn of the yarn storing 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, and is able to detect whether or not the amount of accumulated yarn is equal to or greater than a predetermined amount by detecting the presence or absence of the spun yarn 7 at the predetermined position. The yarn detection sensor 47 can be, for example, an optical reflection type sensor, a capacitance type proximity sensor, or a transmission type sensor. 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 amount of stored yarn of the yarn storage roller 41 so as to be 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, not shown, as a negative pressure source, and can generate a suction airflow in the tube 73. When the spun yarn 7 is cut off at the upstream side of the yarn accumulating device 17 in the yarn traveling direction (between the yarn supplying device 23 and the yarn accumulating device 17), the suction device 49 generates a suction airflow around the yarn accumulating roller 41. Accordingly, the suction device 49 can suck and catch the portion of the spun yarn 7 on the upstream side of the yarn accumulating roller 41 in the package 9 side.

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

In the present embodiment, the yarn tail removal lever 51 is configured to be of a single-hammer drive type. That is, the yarn tail removing levers 51 are provided in the respective spinning units 1, and a separate driving unit (a motor, an air cylinder, or the like) is provided for the respective yarn tail removing levers 51. Therefore, the yarn tail removing rod 51 can be independently operated from the yarn tail removing rods 51 of the other spinning units 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 regulate 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 portion formed on a plate-like member fixed to the textile unit 1 or a circular portion partially cut out.

The yarn splicing device 19 is provided downstream of the guide 55 (i.e., downstream of the yarn storage device 17). When the spun yarn 7 is disconnected between the yarn feeding device 23 and the winding device 21 in the yarn traveling 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 splicing device 19 is a splicing device that ply-twists yarn ends to each other by a rotating air flow generated by air. In addition, instead of the splicing device, a mechanical knotter or the like can be used as the splicing device 19.

A guide 57 is provided at the weaving unit 1. When the spun yarn 7 is cut at 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 splicing device 19. The guide device 57 is supported to be rotatable at one end in the longitudinal direction thereof and rotatable in the vertical direction. The guide device 57 includes a hollow member and is connected to a suction source not shown. The guide device 57 can generate a suction airflow at 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 through 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 splicing 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 splicing device 19 by the guide device 57. As described later, the spun yarn 7 from the package 9 is caught by the catching device 83 and guided to the yarn splicing device 19. In this state, the yarn splicing device 19 is driven to perform a yarn splicing process so that the spun yarn 7 from the yarn feeding device 23 is connected to the spun yarn 7 from the package 9. Thus, even when the spun yarn 7 is cut on the upstream side of the yarn accumulating device 17, the spinning unit 1 can restart the stopped spinning and yarn splicing process, and rewind the spun yarn 7 from the yarn feeding device 23 into the package 9.

A winding device 21 is provided downstream of the yarn storage device 17 (downstream of the yarn splicing 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 textile unit 1 has a layout in which the yarn channels are arranged to extend from bottom to top. The winding device 21 includes a swing arm 61 and a winding drum 63.

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

A winding drum driving motor, not shown, of the winding drum 63 is controlled by the unit controller 25, and the winding drum 63 rotates in contact with the outer peripheral surface of the winding tube 67 or the package 9. A traverse groove, not shown, is formed on the outer peripheral surface of the winding drum 63, and the spun yarn 7 can be laterally moved by a predetermined width by the traverse groove. Thus, the winding device 21 can wind the spun yarn 7 around the winding pipe 67 while moving in the lateral direction to form the package 9.

In the present embodiment, the winding device 21 is configured as a single hammer drive type. That is, the winding device 21 provided in each spinning unit 1 is configured to have a separate driving unit (a winding drum driving motor) and thereby rotate the winding drum 63 and, in turn, 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.

Instead of the winding drum 63 having the traverse groove, the winding device 21 may have a known configuration including a winding drum having no traverse groove and a traverse guide that is provided independently of the winding drum and reciprocates.

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

When the spinning unit 1 normally spins, the package 9 in the winding device 21 and the yarn accumulating roller 41 in the yarn accumulating device 17 rotate in predetermined directions. In the following description, a predetermined direction in which the package 9 rotates at this time may be referred to as a normal rotation direction, and a predetermined direction in which the yarn accumulating roller 41 rotates may be referred to as a normal rotation direction.

In the spinning unit 1, 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 may be cut depending on the monitoring result of the yarn monitoring device 15 as described above. At this time, the spun yarn 7 is broken between the yarn feeding device 23 and the yarn accumulator 17 in the yarn traveling direction. In the present embodiment, the yarn 7 is cut by stopping the feeding operation of the yarn feeding device 23. Then, the drawing operation of the yarn accumulator 17 and the winding operation of the winding device 21 are stopped immediately or after a predetermined time has elapsed.

At the time point when the spun yarn 7 is broken, as indicated by the dashed line in fig. 1, the yarn end 7t of the spun yarn 7 on the package 9 side is positioned between the yarn feeding 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 of the winding device 21 is performed at a speed slower than that before the 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 the end is that the unwinding of the spun yarn 7 from the yarn accumulating roller 41 is completed. When the spun yarn 7 is completely unwound from the yarn accumulating roller 41, the end portion thereof is separated from the yarn accumulating roller 41 and is caught by the catching device 83 immediately after that. The change in the yarn path accompanying the capture of the spun yarn 7 by the capture device 83 is detected by the detection device 81. The capturing device 83 and the detecting device 81 will be described in detail later.

When the detection device 81 no longer detects the spun yarn 7, the unit controller 25 stops the rotation of the package 9 in the normal rotation direction by the winding device 21. 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.

Accordingly, when the spun yarn 7 is cut off between the yarn feeding device 23 and the yarn accumulating device 17 in the yarn traveling direction, 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 at which 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 traveling direction.

Next, the suction device 49 will be described in detail. When the spun yarn 7 is cut between the yarn accumulating device 17 and the yarn feeding device 23, the draft operation of the draft device 11 is immediately stopped. Immediately after or after a predetermined time has elapsed 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. Therefore, in a state where the yarn end 7t of the spun yarn 7 on the package 9 side is disposed 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 it is continuous between the package 9 and the yarn accumulating device 17. Subsequently, the package 9 is restarted at a speed lower than that before the disconnection by the rotation of the winding device 21 in the normal rotation direction, and the spun yarn 7 is unwound from the yarn accumulating roller 41 toward the downstream side. 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 generates a suction airflow by the suction device 49, 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. Accordingly, until all the spun yarn 7 remaining on the yarn accumulating roller 41 is unwound toward the downstream side, the spun yarn 7 is guided so that the path of the spun yarn 7 on the upstream side of the yarn accumulating roller 41 does not change during this period. In other words, the suction device 49 restricts the behavior so that the yarn end 7t of the spun yarn 7 does not become a free state, 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 opening 71 faces the yarn storage roller 41. A first valve 77 is provided at a longitudinal middle portion of the tube 73. The opening and closing of the first valve 77 is controlled by the unit controller 25. By controlling the opening of the first valve 77, a suction airflow can be generated in the pipe 73 of the suction device 49. By controlling the first valve 77 to be closed, the suction airflow of the pipe 73 can be stopped. When the suction airflow is generated, the 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. The suction source 75 is provided at, for example, a machine base end of the spinning machine, and is shared by the plurality of spinning units 1.

The suction port 71 is disposed toward the yarn introducing portion 79 of the yarn storage device 17. The yarn introduction portion 79 is an area located immediately before the position where the spun yarn 7 substantially starts to be wound, in the outer peripheral surface of the yarn accumulating roller 41.

The yarn introduction portion 79 is 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 as it goes downstream. As the package 9 rotates in the normal rotation direction, the spun yarn 7 is wound, and the spun yarn 7 travels a spiral path from upstream to downstream in the accumulating portion 41a of the yarn accumulating roller 41. The axis of the yarn accumulating roller 41 coincides with the spiral axis around which the spun yarn 7 is wound. A tapered portion 41b is formed in the yarn accumulating roller 41 at an end portion corresponding to the upstream side of the spiral, out of both ends of the shaft of the yarn accumulating roller 41. The tapered portion 41b corresponds to the yarn introducing portion 79.

Hereinafter, the upstream side in the axial direction of the yarn accumulating roller 41 means the upstream side of the spiral in the axial direction, and the downstream side in the axial direction 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 reservoir portion 41 a. The tapered portion 41b has a diameter that decreases as it approaches the reservoir portion 41a, and is equal to the diameter of the reservoir portion 41a at a portion connected to the reservoir portion 41 a.

The yarn introducing portion 79 is disposed on the upstream side (lower side in fig. 3) in the axial direction of the yarn accumulating roller 41 than the most upstream portion 80 around which the spun yarn 7 is aligned in the accumulating portion 41 a. The spun yarn 7 from the upstream side in the yarn traveling direction is guided to the most upstream portion 80 while being guided in contact with the yarn introducing portion 79 (tapered portion 41b) as necessary by applying tension by the rotation of the yarn accumulating roller 41.

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

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 described specifically with reference to the timing chart of fig. 4. The time t0 is a time when the spun yarn 7 breaks. When the spun yarn 7 is broken, the unit controller 25 stops the normal rotation of the package 9 and the normal rotation of the yarn accumulating roller 41 at time t1 when a predetermined time has elapsed from time t 0. Specifically, the unit controller 25 stops the driving of the take-up drum driving motor and the driving of the yarn storage 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 normal rotation of the yarn accumulating roller 41 before stopping at time t 1. At the time point t1, the yarn end 7t of the spun yarn 7 on the package 9 side is located near the most upstream portion 80.

Thereafter, the unit controller 25 starts the reverse rotation of the yarn accumulating roller 41 while maintaining the state where the rotation of the package 9 is stopped at time t 2. The rotation of the yarn accumulating roller 41 in the reverse direction continues until time t 3.

The rotation of the yarn accumulating roller 41 in the reverse direction causes the yarn end 7t of the spun yarn 7 on the package 9 side to be sucked by the suction device 49. 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 introduction portion 79. Therefore, in the process of rotating the yarn storage 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, the yarn end 7t in a state of being sucked into the suction device 49 is denoted by reference numeral 7 c.

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

At the same time t3 as the stop of the rotation in the reverse rotation direction, the yarn storage roller 41 starts the rotation in the normal rotation direction. Until time t4, the normal rotation of the yarn accumulating roller 41 continues. 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.

By the normal rotation of the yarn accumulating roller 41 from the time t3 to the time t4, a part of the spun yarn 7 drawn into the suction device 49 temporarily is pulled out and 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 pulled 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 breaks. 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 of the time t4, the yarn end 7c remains in the state of entering the inside of the suction device 49. That is, at this time point, the yarn end 7c does not come out of the suction port 71.

Although a part of the spun yarn 7 is drawn out from the suction device 49 with the rotation of the yarn accumulating roller 41 in the normal rotation direction, the suction device 49 operates a suction airflow against the drawing direction. Therefore, the suction device 49 also functions as a resistance applying portion that applies resistance against the spun yarn 7 traveling in the direction of being wound around the yarn accumulating roller 41.

At a time t4, after the yarn accumulating roller 41 stops rotating in the normal rotation direction, at a time t5, the package 9 starts rotating in the normal rotation direction. As a result, the spun yarn 7 is pulled toward the package 9, and the spun yarn 7 is unwound from the yarn accumulating roller 41 toward the downstream side. At this time, since the yarn end 7c on the upstream side is sucked into the suction device 49, the yarn end 7c can be prevented from being entangled with the unwound spun yarn 7. Therefore, the spun yarn 7 can be smoothly unwound from the yarn accumulating roller 41.

In the process of rotating the package 9 in the normal rotation direction, the yarn end 7c starts to be drawn out from the suction device 49 substantially simultaneously with the entire unwinding of the spun yarn 7 from the yarn accumulating roller 41. In the end, the yarn end 7c of the spun yarn 7 on the package 9 side is pulled out from the suction device 49 and moves to the downstream side of the yarn accumulating device 17.

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

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

At the time point t1, as indicated by reference numeral 7a in fig. 3, the yarn end 7t is in a free state in the vicinity of the most upstream portion 80. The yarn end 7a in the free state is highly likely to contact 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 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, the spun yarn 7 on the yarn accumulating roller 41 may be entangled and fall off together to cause slippage, and an unwinding error of the spun yarn 7 from the yarn accumulating roller 41 may occur.

As one method of preventing the yarn end 7a from being entangled with the spun yarn 7 wound around the yarn accumulating roller 41, it is conceivable to wave the yarn end 7a by centrifugal force. Therefore, the yarn accumulating roller 41 can be rotated in the normal rotation direction at a certain speed while the spun yarn 7 is being pulled out downstream from the yarn accumulating roller 41 and unwound. However, when the yarn accumulating roller 41 is rotated when the spun yarn 7 from the yarn accumulating roller 41 is unwound toward the downstream side, an undesirable change occurs in the strength of twist of the spun yarn 7 between the yarn accumulating roller 41 and the winding device 21.

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 introduction portion 79. Further, the spun yarn 7 is wound up around the outer peripheral surface of the yarn accumulating roller 41 by the normal rotation of the yarn accumulating roller 41.

As described above, the spun yarns 7 wound around the yarn accumulating roller 41 are regularly arranged in 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 and fed from the yarn accumulating roller 41 to the downstream side in a regular spiral shape. After (or at approximately the same time as) the last roll of spun yarn 7 is unwound from the yarn storage roller 41, the yarn end 7c is pulled out from the suction opening 71 of the suction device 49. Therefore, entanglement of the yarn end 7t can be reliably prevented.

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

In the present embodiment, when the unwinding of the spun yarn 7 from the yarn accumulating roller 41 is completed, the yarn tail removing lever 51 performs the yarn tail removing operation. Hereinafter, this yarn end removing operation may be referred to as a first yarn end removing operation. The first yarn tail removing operation is performed later than the timing at which the yarn end 7t of the spun yarn 7 is separated from the yarn accumulating roller 41. The timing at which the first yarn end removing operation is performed may be referred to as a first timing.

Specifically, the first yarn end removing operation is described. When determining that the unwinding of the spun yarn 7 from the yarn accumulating roller 41 is completed, the unit controller 25 controls the winding device 21 to stop the rotation of the package 9. At substantially the same timing as the stop of the rotation of the package 9, the unit controller 25 controls the yarn accumulating device 17 so that the yarn tail removing lever 51 moves from the standby position to the yarn tail 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 through the vicinity of the flyer 45 while being separated from the yarn accumulating roller 41, and passes downstream. During this process, the free yarn end 7t or its vicinity may be caught by the flyer 45. In the present embodiment, even when the first yarn end removing operation is performed, the yarn end 7t or its vicinity can be removed from the flyer 45. The movement timing of the yarn tail removing lever 51 is not particularly limited, and may be any timing as long as it is a timing before the yarn is connected by the connecting device 19.

The first yarn end removal action is not necessarily required. For example, a sensor for detecting that the spun yarn 7 is not entangled may be provided in the flyer 45, and the first yarn tail removal operation may be performed only when the sensor detects that the spun yarn 7 is entangled. Alternatively, the first yarn end removing operation may be omitted. In the present embodiment, the first yarn tail removing operation is performed when the spun yarn 7 is supposed to be completely unwound from the yarn accumulating roller 41, and it is not clear whether or not the spun yarn 7 is actually unwound from the yarn accumulating roller 41.

An operation stroke (first operation amount) of the yarn tail removing lever 51 in the case of performing the first yarn tail removing operation is different from an operation stroke (second operation amount) of the yarn tail removing lever 51 in the case of performing the second yarn tail removing operation described later in other cases. In other words, the location of the yarn end removal relative to the flyer 45 is different in the two cases.

The other case refers to, for example, a case where the spun yarn 7 from the yarn feeding device 23 is guided to the yarn splicing device 19 by the guide device 57 in a series of yarn splicing 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 winding of the spun yarn 7 around 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 tail removing lever 51 from the standby position to the yarn tail removing position. Hereinafter, this yarn end removing operation may be referred to as a second yarn end removing operation. Accordingly, 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 tail removing lever 51 returns to the standby position again, and the spun yarn 7 is hooked on the flyer 45 and wound around the yarn accumulating roller 41. Then, the spun yarn 7 and the spun yarn 7 on the package 9 side prepared by the catching device 83 are connected by the connecting device 19. Hereinafter, the time at which the second yarn end removing operation is performed may be referred to as a second time. The second time is different from the first time.

The flyer 45 is likely to be entangled with the spun yarn 7 in the case where the flyer 45 is in contact with the vicinity of the free yarn end 7t than in the case where the flyer is in contact with the middle portion of the spun yarn 7. Therefore, in the present embodiment, the first operation amount is set to be larger than the second operation amount. In other words, the yarn tail removal position in the first yarn tail removal operation is located farther from the flyer 45 than the yarn tail removal position in the second yarn tail removal operation. Thus, even if the yarn end 7t gets entangled with the flyer 45, the yarn end 7t can be reliably removed from the flyer 45 by the yarn tail removal rod 51.

Next, when the spun yarn 7 is disconnected between the yarn supplying device 23 and the yarn accumulating device 17, the processing of the yarn end of the spun yarn 7 on the package 9 side performed after 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 detecting device 81 is capable of detecting the yarn end 7t located between the yarn storage 17 and the winding-up device 21 after unwinding from the yarn storage 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 detection device 81 is disposed in the vicinity of the yarn accumulating device 17 with respect to 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. In detail, the detection device 81 is disposed between the guide 55 and the yarn splicing 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 near the detection device 81.

When the spun yarn 7 is pulled between the guide 55 and the winding device 21 in a state where the spun yarn 7 is wound around the yarn accumulating roller 41, the spun yarn 7 is positioned along a path (a part of a yarn traveling path) 111 of the spun yarn 7 indicated by a chain line in fig. 5. The detection device 81 is disposed to face an appropriate position of the path 111 of the spun yarn 7, and detects whether the spun yarn 7 is located 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 detection device 81 detects the presence of the spun yarn 7 because the spun yarn 7 is positioned along the path 111. 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 cut, 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, which cannot maintain tension, is deviated from the path 111 and sucked into a catching device 83 described later. In this way, the detecting device 81 detects whether the spun yarn 7 is positioned on the path 111 of the spun yarn 7 and detects whether the yarn end 7t is positioned between the yarn accumulating roller 41 and the winding device 21 almost similarly.

The detection device 81 can be disposed at a position where the operation of the spun yarn 7 is stable. The detection device 81 may be disposed, for example, at any position in a region downstream of the axial center portion of the yarn accumulating roller 41 among positions opposed to the yarn accumulating roller 41, or may be disposed in the vicinity of the suction device 49 (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 refer to a portion of the spun yarn 7 where the spun yarn 7 is completely finished, but also includes the portion and a region in the vicinity thereof.

The spinning unit 1 includes a catching device 83 that catches the spun yarn 7 on the downstream side of the yarn accumulating device 17 (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 at a position near the detecting device 81 between the yarn accumulating device 17 and the yarn splicing device 19 in the yarn traveling direction. The catching device 83 is disposed in the vicinity of the yarn accumulating device 17 in the yarn running direction with respect to the winding device 21.

When the spun yarn 7 is broken on the upstream side in the yarn traveling direction from the yarn accumulating device 17, the catching device 83 sucks and catches the yarn end 7t of the spun yarn 7 on the package 9 side. The catching device 83 may not suck the portion where the spun yarn 7 is completely ended at the yarn end 7t first when the yarn end 7t is sucked and caught.

The catcher 83 includes a pipe 85. In the present embodiment, the trap device 83 further includes an air suction device 87 that generates a suction airflow by supplying compressed air.

The tube 85 has a cylindrical shape. The tube 85 is connected to the suction source 75 as a negative pressure source. Therefore, the trap 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 tube 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 passage (a path 111 of the spun yarn 7 in fig. 5) formed between the yarn storage device 17 and the winding device 21. The relative position of the catching opening 89 to the yarn passage is not particularly limited as long as it is located in the vicinity of the yarn passage on the downstream side of the yarn accumulating roller 41. In the present embodiment, the catching opening 89 is fixedly provided in the spinning unit 1. Specifically, the spinning machine includes a frame, not shown, for mounting the spinning unit 1 and the like. The tube 85 is fixed to the frame. Instead of being fixed directly to the frame, the tube 85 may be fixed indirectly via other components relative to the frame. This can realize a structure in which the catching opening 89 is fixed.

The air intake device 87 is supplied with compressed air generated by a compressed air source 91. The suction device 87 discharges compressed air from an unillustrated discharge hole, and thereby not only the suction airflow generated by the suction source 75 but also an additional suction airflow can be generated in the capture opening 89. A second 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 second valve 93 is an electromagnetic valve for switching whether or not to supply compressed air to the intake device 87. The opening and closing of the second valve 93 is controlled by the unit controller 25. The control of opening the second valve 93 generates a suction airflow in the suction device 87 (the trap 83), and the control of closing the second valve 93 stops the suction airflow in the suction device 87.

As described above, in the present embodiment, the trap device 83 includes the suction device 87. Accordingly, a strong suction airflow is generated in the catching opening 89 by the flow of air generated by the jet air in the catching device 83, 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 catch the yarn end 7t of the spun yarn 7 on the package 9 side by a suction force of sufficient strength, and the suction device 87 may not be necessarily provided, or the suction device 87 may not be provided.

The timing at which the air suction device 87 is operated to catch the yarn end 7t of the spun yarn 7 on the package 9 side by the catching device 83 is not particularly limited. For example, the unit controller 25 may operate the air suction device 87 when determining that the amount of the spun yarn 7 remaining in the yarn accumulating roller 41 is less than the predetermined amount. The determination of the amount of the spun yarn 7 remaining in the yarn accumulating roller 41 can be performed 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 around the package 9, the unit controller 25 controls the rotation of the package 9. Specifically, as described below. By the rotation of the package 9 in the normal rotation direction, 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 moment when the spun yarn 7 is unwound from the yarn accumulating roller 41 and the yarn end 7t of the spun yarn 7 is separated 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, when the detection device 81 no longer detects the spun yarn 7, the unit controller 25 stops the normal rotation of the package 9. 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 into the package 9.

After that, the package 9 is temporarily rotated in the reverse rotation direction. Thereby, a part of the spun yarn 7 is unwound from the package 9 and sucked into the catching device 83. The spun yarn 7 sucked into the catching device 83 is discarded in the process of being connected by the connecting device 19. How the package 9 is rotated in the reverse 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 length of the spun yarn 7 sucked and removed by the catcher 83 can be shortened by reducing the amount of rotation in the reverse rotation direction of the package 9, and the amount of the spun yarn 7 discarded can be reduced.

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 not be separated from the surface of the package 9 and may be stuck. When the package 9 is rotated in the reverse direction in this state, reverse winding in which the spun yarn 7 is wound in a direction opposite to the normal direction occurs. The rewinding becomes a cause of a failure in the wire connection process of the wire connection device 19 and a reduction in the quality of the package 9. However, in the present embodiment, by operating the air suction device 87 in the catching device 83, the spun yarn 7 can be strongly sucked and pulled through the catching opening 89. As a result, the occurrence of reverse winding can be prevented.

In the present embodiment, the first injection device 97 is provided on the downstream side of the yarn accumulating roller 41. The first 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 interposed therebetween. In other words, the first injection device 97 and the trap device 83 (the trap opening 89) are arranged on a straight line. Therefore, the first injection device 97 can inject air to the trap 83 (trap opening 89). The air ejected from the first 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, since the portion near the yarn end 7t of the spun yarn 7 on the package 9 side is blown toward the catching opening 89, the catching device 83 can catch the yarn end 7t more reliably. The timing at which the first injection device 97 injects is not particularly limited. This timing may be, for example, a timing at which the yarn detection sensor 47 no longer detects the spun yarn 7, that is, a timing at which the spun yarn 7 is about to disappear from the yarn accumulating roller 41, or a timing at which the air suction device 87 is operated by the catching device 83.

The first injection device 97 is supplied with compressed air generated by a compressed air source 101. The first injection device 97 injects the compressed air from the injection hole toward the yarn passage (the catching opening 89 of the catching device 83). A third valve 103 is provided in the middle of a compressed air supply path connecting the first injection device 97 and the compressed air source 101. The third valve 103 is an electromagnetic valve for switching whether or not to supply compressed air to the first injection device 97. The opening and closing of the third valve 103 is controlled by the unit controller 25. The compressed air is injected from the first injection device 97 by controlling the third valve 103 to be opened, and the injection of the compressed air is stopped by controlling the third valve 103 to be closed. Further, the compressed air source 101 and the compressed air source 91 may not be separately provided, and the textile unit 1 may be configured to supply compressed air from a single compressed air source.

In the present embodiment, as shown in fig. 1, the second injection device 105 is provided on the downstream side of the first injection device 97. The second spraying device 105 is fixedly provided to the spinning unit 1 or a not-shown work cart. When the spun yarn 7 is broken between the yarn accumulating device 17 and the winding device 21 in the yarn traveling direction, the second jet device 105 jets compressed air so as to guide the yarn end 7t of the spun yarn 7 on the package 9 side toward the catching device 83. The second injection device 105 can be configured similarly to the first injection device 97. Accordingly, when the spun yarn 7 is cut off on the downstream side of the yarn accumulating device 17 in the yarn traveling direction due to a connection failure in the connecting device 19 or the like, the package 9 is rotated in the reverse direction and the compressed air is ejected from the second 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 yarn connection can be performed by the yarn connecting device 19. Therefore, the spun yarn 7 on the package 9 side can be processed with a simple configuration. At the same time or substantially the same time as the start of the injection of the compressed air from the second injection device 105, the package 9 is rotated in the reverse rotation direction by the winding device 21. In addition, the second 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, the yarn accumulating device 17, the detecting device 81, the catching device 83, and the first ejecting device 97. 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 running path) formed between the yarn supplying device 23 and the winding device 21. The yarn accumulating device 17 includes a yarn accumulating roller 41 for winding and accumulating the spun yarn 7 supplied from the yarn supplying device 23. The detection device 81 detects the yarn end 7t of the spun yarn 7 on the package 9 side when the spun yarn 7 is broken on the upstream side in the yarn traveling direction from the yarn accumulating device 17. The catching device 83 catches the yarn end of the yarn on the package 9 side on the downstream side of the yarn storage device 17 (the yarn storage roller 41). The first injection device 97 injects air toward the catching device 83. The winding of the spun yarn 7 on the package 9 side into the package 9 is stopped based on the detection result of the detection device 81 so that the yarn end 7t of the spun yarn 7 on the package 9 side is stopped at a position where the yarn end can be caught by the catching device 83.

Thus, by detecting the yarn end 7t of the spun yarn 7 on the package 9 side by the detection device 81, the rotation of the package 9 can be easily stopped at a position where the yarn end 7t of the spun yarn 7 on the package 9 side can be caught by the catching device 83. Therefore, when the spun yarn 7 is cut at the upstream side in the yarn traveling direction from the yarn accumulating device 17, the spun yarn 7 on the package 9 side can be processed by a simple configuration. The air ejected from the first ejector 97 can guide the yarn end 7t of the spun yarn 7 on the package 9 side toward the catching device 83. Therefore, the yarn end 7t can be reliably caught by the catching device 83.

In the spinning machine of the present embodiment, the detection device 81 is a sensor disposed on the downstream side in the yarn running direction with respect to the yarn accumulating roller 41.

This makes it possible to detect that the yarn end 7t of the spun yarn 7 on the package 9 side reaches the downstream side of the yarn accumulating roller 41.

In the spinning machine of the present embodiment, the sensor as the detection device 81 is a reflection-type sensor.

This makes it possible to easily detect the yarn end 7t of the spun yarn 7 on the package 9 side.

In the spinning machine of the present embodiment, the catching device 83 includes an air suction device 87 that generates suction flow by supplying compressed air.

Thus, the spun yarn 7 can be strongly sucked by the catcher 83 due to the flow of air generated by the jet air. Therefore, when the package 9 is rotated in the reverse rotation direction to unwind the spun yarn 7 from the package 9, the spun yarn 7 on the package 9 side can be prevented from being rewound in the direction opposite to the original direction with respect to the package 9.

In the spinning machine of the present embodiment, the first jet device 97 is disposed on the opposite side of the catching device 83 with respect to the path 111 of the spun yarn 7, which is a part of the yarn travel path.

This enables the yarn end 7t to be reliably caught by the catching device 83.

In the spinning machine of the present embodiment, the catching device 83 includes a tubular tube 85 having a catching opening 89 formed at the tip thereof. The catching opening 89 is fixedly provided. Tube 85 is connected to a suction source.

This enables the catcher 83 to have a simple structure.

The spinning machine of the present embodiment includes a guide 55. The guide 55 is disposed downstream of the yarn accumulating roller 41 and guides the spun yarn 7 wound into the package 9. The detection device 81 is disposed downstream of the guide 55. The detection device 81 detects the spun yarn 7 wound in the package 9.

Thus, since the guide 55 stabilizes the yarn path, the detection device 81 can reliably detect the spun yarn 7 on the downstream side of the yarn accumulating roller 41.

The spinning machine of the present embodiment includes a yarn splicing device 19. When the yarn 7 is cut off on the upstream side of the yarn accumulating device 17 in the yarn traveling direction, the yarn connecting device 19 performs a yarn connecting process of connecting the yarn 7 on the yarn supplying device 23 side and the yarn 7 on the package 9 side.

Thus, even when the spun yarn 7 is cut off on the upstream side of the yarn accumulating device 17 in the yarn traveling direction, the yarn splicing process can be performed to restart the winding of the package 9.

In the spinning machine of the present embodiment, the catching device 83 is disposed between the yarn accumulating device 17 and the yarn splicing device 19 in the yarn advancing direction. The catching device 83 is disposed in the vicinity of the yarn accumulating device 17 in the yarn running direction with respect to the winding device 21.

Accordingly, when the spun yarn 7 is broken at the upstream side of the yarn accumulating device 17 in the yarn travelling direction, the spun yarn 7 on the package 9 side can be easily caught by the catching device 83 located near the yarn accumulating device 17. Further, since the spun yarn 7 on the package 9 side is caught by the catching device 83 between the yarn accumulating device 17 and the yarn splicing device 19, the caught spun yarn 7 on the package 9 side can be smoothly spliced by the yarn splicing device 19.

The spinning machine of the present embodiment includes a second injection device 105. When the spun yarn 7 is broken on the downstream side in the yarn traveling direction from the yarn accumulating device 17, the second jet device 105 jets air so as to guide the yarn end 7t of the spun yarn 7 on the package 9 side toward the catching device 83. The second injection device 105 is disposed in the vicinity of the winding device 21 on the upstream side of the winding device 21, and the injection hole of the second injection device 105 is provided corresponding to the catching position of the catching device 83.

Thus, even when the yarn end 7t of the spun yarn 7 on the package 9 side is located downstream of the catching device 83, the spun yarn 7 on the package 9 side can be drawn from the package 9 and caught by the catching device 83.

The spinning machine of the present embodiment includes a yarn monitoring device 15 capable of detecting a yarn defect included in the spun yarn 7 supplied from the yarn feeding device 23. When the yarn monitoring device 15 detects a yarn defect, the spun yarn 7 is cut on the upstream side of the yarn accumulating device 17 in the yarn traveling direction. The winding device 21 rotates the package 9 in the direction opposite to the winding direction of the package 9 after the spun yarn 7 on the package 9 side is caught by the catching device 83, and removes the spun yarn 7 having a length necessary for removing a yarn defect among the caught spun yarns 7 by the catching device 83.

Thus, the yarn defect detected by the yarn monitoring device 15 can be reliably removed by the catching device 83.

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 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 airflow in the suction port 71 shown in fig. 3. The portion of the spun yarn 7 on the package 9 side on the upstream side of the yarn accumulating roller 41 is blown along the jet flow. Therefore, the yarn end 7a in the free state can be kept from contacting the spun yarn 7 wound around the storing portion 41 a. In this way, the jet device is more gentle than the suction device 49, but can substantially guide the spun yarn 7. By ejecting air from the ejection device, resistance that hinders the spun yarn 7 from traveling in the direction of being wound around the yarn accumulating roller 41 can be applied.

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 sandwiched between the arms arranged in a pair or may be sandwiched between the rollers arranged in a pair. The clamping device can restrain the spun yarn 7 from operating by clamping the spun yarn 7. For example, by providing a damper on the shaft of the roller, resistance that hinders the spun yarn 7 from traveling in the direction of being wound around the yarn accumulating roller 41 can be applied.

When the pair of rollers is provided instead of the suction device 49, the pair of rollers may perform a drawing operation of drawing the spun yarn 7 from the spinning device 13. At this time, the yarn accumulating roller 41 accumulates the spun yarn 7 drawn by the roller pair.

Instead of the suction device 49, a brush or comb teeth (yarn working portion) for hooking 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 operating.

When the spinning unit 1 includes the above-described jet device, roller pair, brush, comb, or the like as the yarn acting portion, the rotation of the yarn accumulating roller 41 in the reverse direction for causing the suction port 71 of the suction device 49 to suck the spun yarn 7 may be omitted. At this time, after the spun yarn 7 is cut, the rotation of the yarn accumulating roller 41 and/or the rotation of the package 7 may not be temporarily stopped in association with the operation of the yarn acting member.

The detection device 81 may be a sensor provided on the outer peripheral surface of the yarn accumulating roller 41 at an end portion of the yarn accumulating roller 41 on the downstream side of the axial center portion in the yarn traveling direction, and arranged 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 center portion in the axial direction of the yarn running. When the spinning unit 1 includes the regulating means 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 means before the time when the sensor detects the yarn end 7 t. The regulating means may be, for example, a member provided near the flyer 45 and capable of stopping the rotation of the flyer 45 of the yarn storage device 17. By restricting the yarn passage by the restricting unit, the yarn end 7t can be stably detected by the sensor.

The detection device 81 may be a sensor provided on the outer peripheral surface of the yarn accumulating roller 41 in a region on the upstream side of the center portion in the axial direction of the yarn accumulating roller 41 in the yarn traveling direction (for example, an end portion on the upstream side in the yarn traveling direction in the accumulating portion 41 a) and arranged to face the outer peripheral surface of the yarn accumulating roller 41.

The yarn detecting sensor 47 for detecting the amount of stored yarn of the yarn storing roller 41 may also serve as the detecting device 81. As described above, the yarn detection sensor 47 detects whether or not the amount of the stored yarn wound around the yarn storage roller 41 is equal to or larger than a predetermined amount. Here, as shown in fig. 3, a case where the spun yarn 7 is broken on the upstream side of the yarn accumulating device 17 in the yarn travelling direction is considered. When the length of the spun yarn 7 sucked into the suction device 49 is small, for example, on the upstream side in the yarn traveling direction from the yarn accumulating roller 41, the detection of the yarn accumulation amount by the yarn detection sensor 47 is substantially the same as the region of the spun yarn 7 near the portion (indicated by reference numeral 7c in fig. 3) where the end of the spun yarn 7 is detected.

The detection device 81 may also be a line sensor. The thread sensor is disposed adjacent to the yarn accumulating roller 41 in the axial direction of the yarn accumulating roller 41. The line sensor faces the outer peripheral surface of the storage portion 41 a. The thread sensor includes a plurality of detecting elements arranged in a direction parallel to the axial direction of the yarn accumulating roller 41. The thread sensor is provided so as to be able to detect a position included in a region of the yarn accumulating roller 41 downstream of the axial center portion in the yarn advancing direction. If all the detection elements do not detect 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 thread sensor serving as the detection device 81 may be provided so as to be able to detect a position included in a region on the upstream side in the yarn running direction from the axial center portion in the storage portion 41a of the yarn storage roller 41. In this configuration, the thread sensor can detect the stored yarn amount of the yarn storage roller 41. The yarn storage amount detected by the yarn sensor is substantially the same as the region in which the spun yarn 7 near the end portion of the spun yarn 7 is detected, similarly to the above-described configuration in which the yarn detection sensor 47 also serves as the detection device 81.

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

When the detection device 81 is provided to face the outer peripheral surface of the yarn accumulating roller 41, for example, a sensor located at a position of reference numeral 81 in fig. 5 may be omitted, and the detection device may be used as a yarn detection sensor for detecting the spun yarn 7 for other suitable purposes.

In the above embodiment, when the yarn monitor 15 detects a yarn defect, the spinning of the spinning device 13 is stopped to cut the spun yarn 7. 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 the weaving units 1 are provided, instead of providing the wiring device 19 in each weaving unit 1, a configuration may be adopted in which a wiring carriage capable of traveling with respect to the plurality of the weaving units 1 and stopping wiring at a working position with respect to the weaving units 1 as necessary is provided.

In the above embodiment, the textile unit 1 has a layout in which the yarn path formed between the yarn feeding device 23 and the winding device 21 is arranged to extend from the bottom to the top. However, the invention can also be applied to a textile unit 1 of a layout in which the yarn channels extend from top to bottom.

In the above embodiment, the spinning machine is an air spinning machine (air jet spinning machine), but may be an open-end spinning machine.

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

It will be apparent from consideration of the above teachings that the present invention may take many modifications and variations. 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 (13)

1. A spinning machine is characterized by comprising:

a yarn feeding device capable of feeding a yarn;

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

a yarn accumulating device which is disposed in the middle of a yarn running path formed between the yarn feeding device and the winding device and which has a yarn accumulating roller for accumulating the yarn supplied from the yarn feeding device;

a detection device that detects a yarn end of the yarn on the package side when the yarn is cut on an upstream side in a yarn traveling direction from the yarn storage device;

a catching device that catches a yarn end of the yarn on the package side on a downstream side of the yarn accumulating device; and

a first injection device that injects air toward the trapping device,

the winding of the yarn on the package side is stopped based on the detection result of the detection device so that the yarn end of the yarn on the package side is stopped at a position where the yarn end can be caught by the catching device.

2. Spinning machine according to claim 1,

the detection device is a sensor configured to detect an outer circumferential surface of the yarn storage roller.

3. Spinning machine according to claim 2,

the sensor is a reflective sensor.

4. Spinning machine according to claim 2 or 3,

the detecting means is a sensor configured to detect a region on a downstream side of the yarn accumulating roller in a yarn traveling direction,

the spinning machine further includes a restriction unit that restricts a yarn passage of the yarn unwound from the yarn accumulating roller included in the yarn travel path at a timing before the sensor detects the yarn end of the yarn on the package side.

5. Spinning machine according to claim 2,

the detection means is a line sensor.

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

the trap device includes an air suction device for generating a suction flow by supplying compressed air.

7. A spinning machine according to any of claims 1-6,

the first jet device is disposed on the opposite side of the yarn catching device with a part of the yarn running path therebetween.

8. A spinning machine according to any of the claims 1-7,

the catching device is provided with a cylindrical pipe with a catching opening formed at the front end,

the catching opening is fixedly arranged on the base plate,

the tube is connected to a suction source.

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

a guide member that is disposed downstream of the yarn accumulating roller and guides the yarn wound into the package; and

and a yarn detection sensor that is disposed downstream of the guide member and detects the yarn wound into the package.

10. A spinning machine according to any of claims 1-9,

the spinning machine includes a yarn splicing device that performs a yarn splicing process of connecting the yarn on the yarn feeding device side and the yarn on the package side when the yarn is cut on the upstream side in the yarn advancing direction from the yarn accumulating device.

11. Spinning machine according to claim 10,

the catching device is disposed between the yarn storage device and the yarn splicing device in the yarn running direction, and is disposed closer to the yarn storage device than the winding device in the yarn running direction.

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

the spinning machine includes a second injection device that injects air so as to guide a yarn end of the yarn on the package side toward the catching device when the yarn is cut off on a downstream side in a yarn traveling direction from the yarn accumulating device.

13. A spinning machine according to any of claims 1-12,

the spinning machine is provided with a yarn monitoring device capable of detecting a yarn defect included in the yarn supplied from the yarn supplying device,

when the yarn monitoring device detects a yarn defect, the yarn is cut on the upstream side of the yarn storage device in the yarn traveling direction,

the winding device rotates the package in a direction opposite to a winding direction of the package after the yarn on the package side is caught by the catching device, and removes the yarn having a length necessary for removing the yarn defect from the caught yarn by the catching device.

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