CN106939451B

CN106939451B - Spinning machine

Info

Publication number: CN106939451B
Application number: CN201610843281.6A
Authority: CN
Inventors: 豊田贵大
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2015-10-06
Filing date: 2016-09-22
Publication date: 2021-07-06
Anticipated expiration: 2036-09-22
Also published as: CN106939451A; JP2017071865A

Abstract

A spinning machine is provided with a draft device (7), an air spinning device (9), a yarn accumulating roller (21), a yarn removing device (65), and a unit controller. The draft device (7) can operate in either mode of a 1 st mode and a 2 nd mode, and performs a spinning reopening operation in the 1 st mode so that the draft ratio is different from that in the normal spinning operation, and performs the spinning reopening operation in the 2 nd mode so that the draft ratio is the same as that in the normal spinning operation. The yarn accumulating roller (21) rotates in a state of being wound therearound and accumulating the spun yarn (10). The yarn removing device (65) can remove the spun yarn (10) stored in the yarn accumulating roller (21). The unit controller can change the length of the spun yarn (10) removed from the yarn accumulating roller (21) by the yarn removing device (65) according to which mode operation of the 1 st mode and the 2 nd mode is performed by the draft device (7) after the spinning reopening operation is finished.

Description

Spinning machine

Technical Field

The present invention relates to a structure of a spinning machine that includes a yarn accumulating roller and performs spinning while repeating stop and reopening of the spinning as necessary.

Background

Conventionally, a spinning machine that drafts a fiber bundle and then performs spinning using an air flow is known to include a unit for accumulating the generated spun yarn. Such a spinning machine is disclosed in japanese patent laid-open publication nos. 2010-180007 and 2003-278035.

The spinning machine disclosed in jp 2010-180007 a is configured to: the spinning device includes a yarn accumulating roller provided between an upstream spinning device and a downstream winding device, and the spun yarn generated during the spinning reopening operation can be removed (discarded) from the yarn accumulating roller by a yarn removing lever provided in the vicinity of the yarn accumulating roller. The spun yarn removed from the yarn accumulating roller is discarded by a suction pipe for guiding the spun yarn from the spinning device to the yarn splicing device. Jp 2010-180007 a describes that this structure prevents a yarn of unstable quality from being mixed into a package wound by a winding device.

The spinning machine disclosed in japanese patent application laid-open No. 2003-278035 includes a loosening pipe for temporarily storing the yarn discharged from the spinning member for re-opening the yarn during the yarn splicing operation by the yarn splicing cart. The spinning machine disclosed in jp 2003-278035 a is configured to be able to change the draft ratio in the draft device between the time of the re-opening of the spun yarn and the time of the normal spinning. Jp 2003-278035 a discloses that this structure can reliably generate a yarn at the time of re-opening of a spun yarn, and can improve the success rate of yarn splicing by the yarn splicing device.

In the above-mentioned japanese patent application laid-open No. 2010-180007, specific control of the yarn removing operation by the yarn removing lever is not described. The spinning machine disclosed in jp 2003-278035 a does not include a yarn accumulating roller and a yarn removing rod. Therefore, when a spun yarn different from the normal one is produced by the yarn re-opening operation, it is difficult to remove (discard) an appropriate length of such a spun yarn. As a result, for example, the normal spun yarn is also removed, and the amount of yarn waste may increase.

Disclosure of Invention

The purpose of the present invention is to prevent the spun yarn produced by a spinning reopening operation from being removed (discarded) more than necessary and to reduce the yarn return amount.

According to the 1 st aspect of the present invention, a spinning machine includes a draft device, an air-jet spinning device, a yarn accumulating roller, a yarn removing device, and a control unit. The drafting device drafts the fiber bundle. The air-jet spinning device twists the fiber bundle drafted by the draft device with an air flow to generate a spun yarn by a spinning reopening operation and a normal spinning operation performed after the spinning reopening operation. The yarn accumulating roller rotates in a state in which the spun yarn is wound therearound and accumulated. The yarn removing device removes the spun yarn accumulated in the yarn accumulating roller. The control unit may change the length of the filament yarn removed from the yarn accumulating roller by the yarn removing device in accordance with a draft ratio at the time of the spinning reopening operation.

The yarn removing device can remove the spun yarn of an appropriate length from the yarn accumulating roller depending on whether the draft ratio in the spinning reopening operation is different from or the same as the draft ratio in the normal spinning operation.

In the above-described spinning machine, the following configuration is preferable. The draft device drafts the fiber bundle in any one of a 1 st mode and a 2 nd mode, and in the 1 st mode, the fiber bundle is drafted at a draft ratio different between the time of the spinning reopening operation and the time of the normal spinning operation, and in the 2 nd mode, the fiber bundle is drafted at the time of the spinning reopening operation and the time of the normal spinning operation at the same draft ratio. The control unit controls to change the length of the filament yarn removed from the yarn accumulating roller by the yarn removing device after the spinning reopening operation is completed, depending on which of the 1 st mode and the 2 nd mode the draft device drafts the fiber bundle.

The operation of changing the length of the yarn removed from the yarn accumulating roller by the yarn removing device according to the draft ratio at the time of the spinning reopening operation can be realized by simple control.

In the above-described spinning machine, the following configuration is preferable. The spinning machine further includes a yarn hooking member. The yarn hooking member is provided to be rotatable with respect to the yarn accumulating roller and to guide the spun yarn. The yarn removing device includes a yarn removing member. The yarn removing member is capable of performing a yarn removing operation for separating the spun yarn from the yarn hooking member by moving. The control unit may change an operation time length of the yarn removing member to perform the yarn removing operation according to which mode of the 1 st mode and the 2 nd mode the draft device operates.

By changing the operating time of the yarn removing member, the length of the removed yarn can be easily changed.

In the spinning machine, it is preferable that the control unit controls the yarn removing operation so that the operation time length of the yarn removing member in the case where the 1 st mode is executed is longer than the operation time length of the yarn removing member in the case where the 2 nd mode is executed.

When the 1 st mode is executed, the spun yarn can be removed longer, and when the 2 nd mode is executed, the spun yarn can be removed shorter. As a result, the amount of wire return in the case of executing mode 2 can be reduced.

According to the 2 nd aspect of the present invention, the spinning machine includes a draft device, an air-jet spinning device, a yarn accumulating roller, a yarn hooking member, a yarn removing device, and a control unit. The draft device performs draft for drawing the fiber bundle. The air-jet spinning device twists the fiber bundle drafted by the draft device with an air flow to produce spun yarn. The yarn storage roller winds the fine yarn around by rotating and stores the fine yarn. The yarn hooking member is provided to be rotatable with respect to the yarn accumulating roller and to guide the spun yarn. The yarn removing member is capable of performing a yarn removing operation for separating the spun yarn from the yarn hooking member. The yarn removing device includes a yarn removing member having a suction port for sucking and catching the spun yarn. The control unit controls the yarn removing unit. The yarn removing member is movable between a yarn removing position, which is a position at the time of the yarn removing operation, and a retracted position retracted from the yarn removing position. The control unit may change a length of time during which the yarn removing member is positioned at the yarn removing position.

By changing the length of time that the yarn removing member is positioned at the yarn removing position, a suitable length of spun yarn can be removed from the yarn accumulating roller.

In the above-described spinning machine, the following configuration is preferable. When the thickness of the spun yarn generated by the air-jet spinning device during a normal spinning operation is 1 st, the draft device drafts the fiber bundle in the 1 st mode so that the thickness of the fiber bundle supplied to the air-jet spinning device is larger during the spinning reopening operation than during the normal spinning operation. In the case where the spun yarn generated by the air-jet spinning device during the normal spinning operation has a thickness of 2 nd thickness that is thicker than the 1 st thickness, the draft device drafts the fiber bundle in the 2 nd mode.

In the case where a fine spun yarn is produced in the normal spinning operation, the spun yarn can be reliably produced by making the draft ratio in the spinning reopening operation different from the draft ratio in the normal spinning operation.

In the above-described spinning machine, the following configuration is preferable. When the spun yarn generated by the air-jet spinning device during a normal spinning operation has a thickness of 2 nd, the draft device drafts the fiber bundle in the 2 nd mode. When the thickness of the spun yarn generated by the air-jet spinning device during the normal spinning operation is the 3 rd thickness which is thicker than the 2 nd thickness, the draft device drafts the fiber bundle in the 1 st mode so that the thickness of the fiber bundle supplied to the air-jet spinning device is thinner during the spinning reopening operation than during the normal spinning operation.

In the case where a thick spun yarn is produced in the normal spinning operation, the spun yarn can be reliably produced by making the draft ratio in the spinning reopening operation different from the draft ratio in the normal spinning operation.

In the above-described spinning machine, the following configuration is preferable. The control unit controls the yarn removing device to remove the spun yarn over a 1 st time period when a spinning speed of the air-jet spinning device to generate the spun yarn is higher than a predetermined speed. The control unit controls the yarn removing device to remove the spun yarn over a 2 nd time period longer than the 1 st time period when the spinning speed is slower than the predetermined speed.

When the spinning speed is high, the time for removing the spun yarn can be shortened, and when the spinning speed is low, the time for removing the spun yarn can be lengthened. As a result, even if the spinning speed is different, an appropriate amount of spun yarn can be removed at the time of the spinning reopening operation.

In the above-described spinning machine, the following configuration is preferable. The spinning machine includes a winding device and a yarn splicing device. The winding device winds the spun yarn into a package. The yarn splicing device splices a yarn end of the spun yarn from the air-jet spinning device and a yarn end of the spun yarn from the winding device in a position between the air-jet spinning device and the winding device in a traveling direction of the spun yarn. The yarn removing device sucks the spun yarn removed from the yarn accumulating roller, removes at least the spun yarn generated by the air-jet spinning device at the time of a spinning reopening operation of the draft device, and then guides the spun yarn to the yarn splicing device.

Since the spun yarn produced from the fiber bundle drafted at the draft ratio different from that in the normal spinning operation can be removed from the spun yarn produced by the normal spinning and then spliced, and the spun yarn can be wound into a package, a high-quality package can be formed. Since the spun yarn is removed by the yarn removing device as described above, the structure of the spinning machine can be simplified.

In the spinning machine, the spun yarn is preferably directly drawn out from the air-jet spinning device by the yarn accumulating roller.

The spun yarn can be stored while being drawn out from the air-jet spinning device with a stable tension.

In the above-described spinning machine, it is preferable that the spinning machine further includes a setting unit that sets at least one of a thickness and a spinning speed of the spun yarn generated by the air-jet spinning device.

The spun yarn of an appropriate length can be removed by a simple operation in the setting section according to the draft ratio at the time of the yarn re-opening operation.

Drawings

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

Fig. 2 is a longitudinal section of the spinning frame.

Fig. 3 is a block diagram relating to the control of the spinning frame.

Fig. 4 is a longitudinal cross-sectional view showing a state where the spun yarn is reopened and the upper yarn and the lower yarn are caught by the suction nozzle and the suction port, respectively.

Fig. 5 is a longitudinal section of the yarn storage device.

Fig. 6 is a perspective view of the yarn storage device.

Fig. 7 is a vertical cross-sectional view showing a state immediately after winding of the spun yarn by the yarn accumulating roller is started.

Fig. 8 is a vertical cross-sectional view showing a state where the spun yarn is accumulated in the yarn accumulating roller.

Fig. 9 is a vertical cross-sectional view showing a state where the spun yarn of unstable quality is removed from the yarn accumulating roller.

Detailed Description

Next, a spinning machine (spinning machine) according to an embodiment of the present invention will be described with reference to the drawings. In the present specification, the terms "upstream" and "downstream" merely mean upstream and downstream in the traveling direction of the fiber bundle 8 and the spun yarn 10 during spinning.

A spinning machine 1 as a spinning machine shown in fig. 1 includes a plurality of spinning units 2 arranged in parallel, a yarn splicing cart 3, a power box 5, and a blower box 80.

Each spinning unit 2 includes, as main components, a draft device 7, an air-jet spinning device 9, a yarn accumulating device 12, and a winding device 13 in this order from upstream to downstream. The spinning machine 1 includes a frame 6, and a draft device 7, an air spinning device 9, a yarn accumulating device 12, a winding device 13, and the like are attached to the frame 6. In the spinning machine 1, a fiber bundle 8 fed from a draft device 7 is spun by an air-jet spinning device 9 to produce a spun yarn 10. The spun yarn 10 fed out from the air-jet spinning device 9 passes through a yarn quality monitoring device 52 described later, and is temporarily accumulated in the yarn accumulating device 12. Subsequently, the spun yarn 10 is wound by the winding device 13 to form a package 45.

The draft device 7 drafts the sliver 15 into the fiber bundle 8. As shown in fig. 2, the draft device 7 includes 4 pairs, i.e., a rear pair 16, a third pair 17, an intermediate pair 19 in which a tangential belt 18 is wound around each roller, and a front pair 20.

The lower roller of the intermediate roller pair 19 and the lower roller of the front roller pair 20 are connected to a common motor in the plurality of spinning units 2, and are driven at the same rotational speed in the plurality of spinning units 2 at all times. The lower roller of the rear roller pair 16 and the lower roller of the third roller pair 17 are driven by motors disposed in the respective spinning units 2, and the rotation speeds thereof are independently controlled for each spinning unit 2. The driving, stopping, and rotation speed of the motors that drive the rear roller pair 16 and the third roller pair 17 are controlled by a unit controller (control unit) 60 shown in fig. 3.

In each spinning unit 2, by changing the rotation speed of the motor that drives the rear roller pair 16 and the third roller pair 17 according to the situation, the draft ratio of the draft device 7 can be changed, and the thickness of the fiber bundle 8 conveyed to the air-jet spinning device 9 (and thus the thickness of the spun yarn 10 spun by the air-jet spinning device 9) can be changed. In the spinning machine 1 of the present embodiment, the operator can change the draft ratio of the draft device 7 by inputting information on the thickness of the spun yarn 10 by operating an input unit (setting unit) 32 of the body control device 30, which will be described later. The "draft ratio" refers to a ratio of the amount of fibers or the number of fibers of the fiber bundle 8 before and after the treatment by the draft device 7.

The air spinning device 9 has a spinning chamber, a fiber guide section, a whirling air flow generating nozzle, and a hollow guide shaft body. The fiber guide section guides the fiber bundle 8 supplied from the draft device 7 into the spinning chamber. The whirling air stream generating nozzle is arranged around the path along which the fiber bundle 8 travels. The whirling air flow is generated in the spinning chamber by ejecting air from a whirling air flow generating nozzle. By this whirling air flow, the respective fiber ends of the plurality of fibers constituting the fiber bundle 8 are reversed and whirled. The hollow guide shaft guides the spun yarn 10 from the spinning chamber to the outside of the air-jet spinning device 9. The air-jet spinning device 9 generates a nozzle jet air from a whirling air flow at the time of a normal spinning operation described later. The air-jet spinning device 9 includes an auxiliary nozzle that opens to a yarn passage inside the hollow guide shaft. The air jet spinning device 9 jets air from the whirling air flow generating nozzle and the auxiliary nozzle at the time of a spinning reopening operation described later, thereby introducing the fiber bundle 8 into the spinning chamber and starting the generation of the spun yarn 10.

A yarn accumulating device 12 is disposed downstream of the air spinning device 9. The yarn accumulating device 12 includes: a function of applying a predetermined tension to the spun yarn 10 to draw out the spun yarn 10 from the air-jet spinning device 9; a function of preventing the spun yarn 10 fed from the air-jet spinning device 9 from loosening at the time of yarn splicing by the yarn splicing cart 3 or the like; and a function of adjusting the tension so that the variation in tension from the winding device 13 is not transmitted to the air-jet spinning device 9. As shown in fig. 2, the yarn accumulating device 12 includes: the yarn feeding device includes a yarn accumulating roller 21, a yarn hooking member 22, an upstream side carrier 23, a motor 25, a downstream side carrier 26, a yarn accumulating amount sensor 27, and a yarn removing lever (yarn removing member) 28.

The yarn hooking member 22 is configured to be capable of guiding (hooking) the spun yarn 10, and is configured to be capable of guiding the spun yarn 10 to the outer peripheral surface of the yarn accumulating roller 21 by rotating in a state of guiding the spun yarn 10.

The yarn accumulating roller 21 is configured to be capable of accumulating the spun yarn 10 by being wound around the outer peripheral surface thereof. The yarn accumulating roller 21 is rotationally driven at a constant rotational speed by a motor 25. The spun yarn 10 guided to the outer peripheral surface of the yarn accumulating roller 21 by the yarn hooking member 22 is wound around the outer peripheral surface of the yarn accumulating roller 21 by the rotation of the yarn accumulating roller 21, and pulls the spun yarn 10 on the upstream side of the yarn accumulating device 12. Thereby, the spun yarn 10 can be continuously drawn out from the air-jet spinning device 9.

As also disclosed in patent document 1, in a spinning machine that performs air-jet spinning, there is also known a configuration in which a delivery roller for pulling out spun yarn from an air-jet spinning device is provided downstream of the air-jet spinning device and upstream of a stock roller. In the structure of patent document 1, the nip roller is disposed so as to face the feed roller. In a state where the yarn is nipped between the delivery roller and the nip roller, the delivery roller is rotationally driven, and the spun yarn is drawn out from the air-jet spinning device. In the spinning machine 1 of the present embodiment, the spun yarn 10 is directly drawn out from the air-jet spinning device 9 by the yarn accumulating roller 21 without using the delivery roller as described above.

In the configuration in which the spun yarn 10 is pulled out from the air-jet spinning device 9 by the yarn pool roller 21 as in the present embodiment, when the spun yarn 10 is pooled in a predetermined amount (for example, 10 revolutions) in the yarn pool roller 21, the force of pulling out the spun yarn 10 from the air-jet spinning device 9 is stabilized. When the contact area between the yarn accumulating roller 21 and the spun yarn 10 is large, slippage or the like between the yarn accumulating roller 21 and the spun yarn 10 is less likely to occur. By rotationally driving the yarn accumulating roller 21 in a state where the spun yarn 10 is wound around the yarn accumulating roller 21 by a predetermined amount or more, the spun yarn 10 can be drawn out from the air-jet spinning device 9 at a stable speed. As described above, in the spinning machine 1 of the present embodiment, the spun yarn 10 can be drawn out at a stable tension and speed by the yarn accumulating device 12, and therefore, the spun yarn 10 of uniform quality can be produced. In the following description, the above-described predetermined amount (the yarn reserve amount at which the force for pulling the spun yarn 10 is stable without causing slippage) may be referred to as a "required minimum reserve amount".

The yarn reserve amount sensor 27 is configured as a non-contact sensor, for example, and detects whether the reserve amount of the spun yarn 10 reserved on the yarn reserve roller 21 is equal to or larger than a predetermined amount or smaller than the predetermined amount. The yarn reserve sensor 27 sends the detection result to the unit controller 60.

The upstream yarn guide 23 is disposed immediately upstream of the yarn accumulating roller 21. The upstream yarn guide 23 appropriately guides the spun yarn 10 with respect to the outer peripheral surface of the yarn accumulating roller 21, and prevents twist of the spun yarn 10 propagated from the air-jet spinning device 9 from being transmitted to the downstream side of the upstream yarn guide 23.

The downstream side carrier 26 is disposed immediately downstream of the yarn accumulating roller 21. The downstream side carrier 26 regulates the trajectory of the spun yarn 10 waved by the rotating yarn hooking member 22, stabilizes the traveling path of the spun yarn 10 on the downstream side of the yarn accumulating roller 21, and guides the spun yarn 10.

The yarn removing lever 28 is disposed near the downstream end of the yarn accumulating roller 21 and upstream of the downstream yarn guide 26. The yarn removing lever 28 is configured to be swingable about a swing shaft 28 b.

A yarn quality monitoring device 52 is provided on the front surface side of the frame 6 of the spinning machine 1 and at a position between the air-jet spinning device 9 and the yarn accumulating device 12. The spun yarn 10 generated by the air-jet spinning device 9 passes through the yarn quality monitoring device 52 before being wound by the yarn accumulating device 12. The yarn quality monitoring device 52 monitors the thickness of the traveling spun yarn 10, and when a yarn defect of the spun yarn 10 is detected, transmits a yarn defect detection signal to the unit controller 60.

As shown in fig. 1 and 2, the yarn splicing cart 3 includes a splicer (yarn splicing device) 43, a suction nozzle (yarn removing member) 44, a suction port 46, a push-up arm 47, and a pneumatic cylinder 49. When a yarn break or yarn cutting occurs in a certain spinning unit 2, the yarn splicing cart 3 travels to the spinning unit 2 on the guide rail 41 fixed to the frame 6, stops, and performs yarn splicing.

As shown in fig. 4, the suction nozzle 44 is configured as an elongated member that can rotate in the vertical direction about an axis, and a suction port is formed at the tip thereof. The suction nozzle 44 is configured to suck and catch a yarn end (upper yarn) fed from the air-jet spinning device 9 through the suction port and guide the yarn end to the splicer 43. The suction port 46 is configured to be rotatable in the vertical direction about an axis, and is configured to suck and catch a yarn end (lower yarn) from a package 45 supported by the winding device 13 and guide the yarn end to the splicer 43. Although the detailed structure of the splicer 43 is omitted, the upper yarn and the lower yarn are spliced by twisting the yarn ends with each other by the whirling air flow.

The push-up arm 47 is disposed at the front end portion of a pneumatic cylinder 49 as an actuator. By driving the air cylinder 49, the push-up arm 47 is moved to the upper advanced position. Thereby, the push-up arm 47 pushes up the yarn removal lever 28, and the yarn removal lever 28 is moved to the raised position as shown in fig. 9.

The winding device 13 includes a cradle arm 71, a winding drum 72, and a traverse device 75. The rocker arm 71 is supported to be swingable about the fulcrum shaft 70. The swing arm 71 rotatably supports the bobbin 48 for winding the spun yarn 10. The winding drum 72 is configured to be driven in contact with the bobbin 48 or the outer peripheral surface of the package 45 formed by winding the spun yarn 10 around the bobbin 48. The traverse device 75 includes a traverse guide 76 that can guide the spun yarn 10. The winding drum 72 is driven by an unillustrated motor while the traverse guide 76 is reciprocated by an unillustrated driving means, and the package 45 is rotated, whereby the spun yarn 10 can be wound while being traversed. The driving of the components constituting the winding device 13 (driving of a lift cylinder described later for swinging the cradle arm 71) is controlled by the unit controller 60.

The power box 5 includes a machine body control device 30. The body control device 30 controls the plurality of spinning units 2. The body control device 30 includes a display unit 31 and an input unit 32. The display unit 31 is configured as, for example, a liquid crystal display, and displays information on the operation state and/or yarn quality of each spinning unit 2 by an appropriate operation of an operator. The input unit 32 includes a plurality of input keys and receives an appropriate instruction from an operator for each spinning unit 2, setting of various conditions, and the like.

The blower case 80 is disposed on one end side in the direction in which the spinning units 2 are arranged in the spinning machine 1, and on the opposite side of the power case 5. An air supply source or the like for generating a suction air flow and a whirling air flow necessary for the winding operation of each spinning unit 2 is provided inside the blower case 80.

Next, the detailed structure of the yarn accumulating device 12 will be described with reference to fig. 5 and 6.

The yarn accumulating roller 21 is a roller member having at least an outer peripheral surface made of a material having abrasion resistance, and is fixed to a motor shaft 25a of the electric motor 25. The outer peripheral surface 21a of the yarn accumulating roller 21 includes a base-end tapered portion 21b, a cylindrical portion 21c, and a tip-end tapered portion 21d in this order from the base end toward the tip end, with the side having the yarn hooking member 22 as the tip end and the side where the motor 25 is disposed as the base end.

The cylindrical portion 21c is formed in a shape slightly tapered at the tip end side, and is formed continuously with respect to the tapered

portions

21b and 21d on both sides without a step. Alternatively, the cylindrical portion 21c may have a shape having a constant diameter from the proximal end side to the distal end side. The size of the cylindrical portion 21c is set appropriately so that at least the spun yarn 10 having a length equal to or greater than the required minimum reserve amount can be reserved. The yarn reserve sensor 27 is provided to face the cylindrical portion 21 c.

The base end side tapered portion 21b and the tip end side tapered portion 21d are each configured to have a gentle tapered shape with the end surface side being the large diameter side. The base end side tapered portion 21b is configured to: the supplied spun yarn 10 smoothly moves from the large-diameter portion to the small-diameter portion and reaches the cylindrical portion 21c, whereby the spun yarn 10 is wound around the surface of the cylindrical portion 21c in order. The leading end side tapered portion 21d prevents the doffing phenomenon in which the spun yarn 10 wound around the cylindrical portion 21c is pulled out at once. However, the distal-side tapered portion 21d may be omitted.

The driving and stopping of the motor 25 are controlled by the unit controller 60. Thereby, the unit controller 60 can control the driving of the yarn accumulating roller 21 and the like. In normal winding, the unit controller 60 rotationally drives the yarn accumulating roller 21 at a constant speed in the normal winding rotational direction. Thus, the spun yarn 10 is wound around the yarn accumulating roller 21 at a constant speed, and the spun yarn 10 wound around the spun yarn 10 is pulled out from the air-jet spinning device 9 at a constant speed.

The yarn hooking member 22 is disposed on the front end side of the yarn accumulating roller 21. The yarn hooking member 22 coincides with the rotation axis of the yarn accumulating roller 21. The yarn hooking member 22 includes a flyer shaft 33 and a flyer 38 fixed to the tip end thereof.

The spindle blade shaft 33 is supported to be rotatable relative to the yarn accumulating roller 21. A permanent magnet is attached to either the flyer shaft 33 or the yarn accumulating roller 21, and a hysteresis material is attached to the other. By these magnetic force units, a torque against the relative rotation of the yarn hooking member 22 with respect to the yarn accumulating roller 21 is generated. The yarn hooking member 22 rotates following the rotation of the yarn accumulating roller 21 by the resisting torque, and as a result, the yarn accumulating roller 21 and the yarn hooking member 22 can rotate integrally. When a force exceeding the blocking torque is applied to the yarn hooking member 22, the yarn hooking member 22 rotates relative to the yarn accumulating roller 21.

The flyer 38 is appropriately curved toward the outer peripheral surface 21a of the yarn accumulating roller 21, and is configured to have a shape capable of guiding the spun yarn 10. In a state where the yarn is not wound around the yarn accumulating roller 21, the flyer 38 rotates to guide the spun yarn 10 toward the outer peripheral surface 21a of the yarn accumulating roller 21. Thereby, the spun yarn 10 starts to wind around the yarn accumulating roller 21.

Next, a case of the spun yarn 10 wound around the yarn accumulating roller 21 will be described. The spun yarn 10 having passed through the upstream yarn guide 23 is guided from the base-end tapered portion 21b to the outer circumferential surface 21a, and is wound around the cylindrical portion 21c by a plurality of turns. The spun yarn 10 pulled out from the front end side of the outer peripheral surface 21a passes through the flyer 38, and then is fed downstream by the downstream side carrier 26.

As described above, the yarn accumulating device 12 includes the yarn removing lever 28. The yarn removing lever 28 is formed into a substantially L-shaped member having a horizontally arranged elongated contact surface 28a as shown in fig. 6. The base of the yarn removing lever 28 is supported by a swing shaft 28b, and the yarn removing lever 28 is configured to be swingable (movable) up and down between a raised position and a lowered position about the swing shaft 28 b. When the yarn removing lever 28 is located at the lowering position (retracted position, for example, the position shown in fig. 2), the yarn removing lever 28 does not contact the yarn path of the spun yarn 10. When the yarn removing lever 28 is located at the raised position (yarn removing position, for example, the position shown in fig. 9), the contact surface 28a pushes up the spun yarn 10, and thereby the spun yarn 10 is separated from the flyer 38. The yarn removing lever 28 is biased by a spring member, not shown, and is held at a lowered position in a normal state. The yarn removing lever 28 is pushed by the push-up arm 47 and moved to the raised position by being driven by the pneumatic cylinder 49 of the yarn joining carriage 3.

By moving the yarn removing lever 28 to the raised position, the spun yarn 10 can be separated from the yarn hooking member 22, and the spun yarn 10 can be unwound from the yarn accumulating roller 21. When the yarn take-off lever 28 is held at the raised position in a state where the spun yarn 10 is not wound around the yarn accumulating roller 21, the flyer 38 can be prevented from contacting the spun yarn 10, and the spun yarn 10 is not wound around the yarn accumulating roller 21.

Next, a description will be given of a configuration for removing an unnecessary portion in the case where the spun yarn 10 accumulated in the yarn accumulating device 12 has the unnecessary portion.

As described above, the yarn removing lever 28 is driven by the pneumatic cylinder 49 provided in the yarn joining carriage 3 and pushed up by the push-up arm 47 to the raised position, and the spun yarn 10 can be separated from the yarn hooking member 22. This prevents the flyer 38 from contacting the spun yarn 10, and prevents the spun yarn 10 from being wound around the yarn accumulating roller 21. The suction nozzle 44 can suck the spun yarn 10 by the suction air flow generated from the blower box 80. The suction nozzle 44 is connected to a dust box, not shown, provided in the blower box 80 for discarding the waste wire, via an appropriate pipe. In the present embodiment, the yarn removing device 65 that removes (discards) the unnecessary spun yarn 10 is configured by a combination of the yarn removing lever 28 provided in the yarn accumulating device 12 and the suction nozzle 44 provided in the yarn splicing cart 3.

Next, the operation of the yarn removing device 65 for removing the spun yarn 10 accumulated in the yarn accumulating device 12 will be specifically described.

Fig. 2 shows a normal state in which the air-jet spinning device 9 generates the spun yarn 10 in the spinning unit 2 and the spun yarn is wound into the package 45 by the winding device 13. In this state, the unit controller 60 performs control so that the sliver 15 is drafted by the draft device 7 and supplied to the air-jet spinning device 9, and performs control so that the air-jet spinning device 9 performs air-jet spinning to generate the spun yarn 10. Hereinafter, the operation of the draft device 7 in the normal state shown in fig. 2 may be referred to as a normal spinning operation.

As will be described later, the draft ratio of the draft device 7 in the normal spinning operation is determined based on the thickness of the spun yarn 10 generated in the normal spinning operation, which is set by the input unit 32 of the body control device 30. The spun yarn 10 fed out from the air-jet spinning device 9 passes through the yarn quality monitoring device 52, and the presence or absence of a yarn defect is detected. Subsequently, the spun yarn 10 is conveyed toward the yarn stock device 12.

The unit controller 60 controls to hold the yarn take-off lever 28 at the lowered position in the normal state shown in fig. 2. Therefore, the spun yarn 10 is temporarily accumulated in the yarn accumulating roller 21 while being guided to the yarn hooking member 22. The reserve amount of the spun yarn 10 with respect to the yarn accumulating roller 21 is appropriately adjusted by appropriately controlling the winding speed of the package 45 in the winding device 13. The spun yarn 10 unwound from the yarn accumulating roller 21 is wound into a package 45 by a winding device 13.

When detecting that a yarn defect exists in the spun yarn 10, the yarn quality monitoring device 52 transmits a yarn defect detection signal to the unit controller 60. Upon receiving the yarn defect detection signal, the unit controller 60 stops the spinning by the air-jet spinning device 9 to cut the spun yarn 10, and further stops the operation of the draft device 7 and the like. After the spinning is stopped, the unit controller 60 performs control so as to rotate or reverse the yarn accumulating roller 21 and remove the spun yarn 10 from the yarn accumulating roller 21. As a result, the spun yarn 10 is not accumulated at all on the yarn accumulating roller 21.

Subsequently, the unit controller 60 sends a control signal to the joint carriage 3 to travel to the spinning unit 2. Subsequently, the unit controller 60 drives the draft device 7, the air-jet spinning device 9, and the like again. Hereinafter, the operation of the draft device 7 at this time may be referred to as a spinning reopening operation.

In the normal spinning operation, the spinning unit 2 generates the spun yarn 10 having the thickness set by the input section 32. In the spinning reopening operation, the spinning unit 2 generates the spun yarn 10 of the medium yarn (for example, 30 yarns) for a reason described later, regardless of the setting in the input section 32. Therefore, for example, when the spun yarn 10 for generating a fine yarn is set by the input section 32, the draft ratio of the draft device 7 is set to the draft ratio corresponding to the fine yarn in the normal spinning operation to generate the spun yarn 10 of the fine yarn, and on the other hand, the draft ratio of the draft device 7 is changed to the predetermined draft ratio in the spinning reopening operation to generate the spun yarn 10 of the medium yarn (specifically, 30 yarns) (mode 1). On the other hand, when the spun yarn 10 that produces the medium yarn (30 yarns) is set by the input section 32, the draft ratio of the draft device 7 is set to the draft ratio corresponding to the medium yarn in both the normal spinning operation and the spinning reopening operation (mode 2). The details of the control of the draft ratio will be described later.

After the spinning reopening operation is started, the yarn end (upper yarn) of the spun yarn 10 fed out from the air-jet spinning device 9 is sucked and caught by the suction nozzle 44 which is turned upward as shown in fig. 4. Subsequently, the suction nozzle 44 is rotated to the lower side, as shown in fig. 7, and the upper yarn is guided toward the splicer 43. Accordingly, the spun yarn 10 pulled out from the air-jet spinning device 9 is hooked on the yarn hooking member 22 as shown in fig. 7, and the spun yarn 10 is gradually wound around the yarn accumulating roller 21 as shown in fig. 8 by the rotating yarn hooking member 22.

At substantially the same time (before or after), the unit controller 60 sucks and catches the lower yarn by the suction port 46 that rotates downward as shown in fig. 4 while reversing the package 45 by a reversing device (not shown) to unwind the lower yarn from the package 45. Subsequently, the suction port 46 is rotated to the upper side as shown in fig. 7, and the lower yarn is guided toward the splicer 43.

When a predetermined time has elapsed since the spun yarn 10 starts to be wound around the yarn accumulating roller 21, and the spun yarn 10 having a length equal to or greater than the minimum accumulating amount is accumulated in the yarn accumulating roller 21, the unit controller 60 controls the draft device 7 so as to draft the fiber bundle 8 at the draft ratio in the normal spinning operation. That is, the spinning reopening operation described above is ended in the draft device 7, and the operation is switched to the normal spinning operation. Thereby, normal spinning by the air-jet spinning device 9 is started. At this time, since the spun yarn 10 having a length equal to or greater than the required minimum reserve amount is wound around the yarn accumulating roller 21, the spun yarn 10 is drawn out from the air-jet spinning device 9 at a stable tension and speed. Therefore, stable spinning is performed in the air-jet spinning device 9.

Even if the air-jet spinning device 9 starts to produce the spun yarn 10 of the normal quality as described above, the spun yarn 10 of the thickness different from the normal thickness produced by the spinning reopening operation or the spun yarn 10 of the unstable quality (produced before the spun yarn 10 of the minimum required reserve amount is wound around the yarn accumulating roller 21) although the spun yarn 10 of the same thickness as the normal thickness remains on the yarn accumulating roller 21. Therefore, the unit controller 60 controls the yarn removing lever 28 to move to the upward position as shown in fig. 9 immediately before switching to the normal spinning operation. As a result, the spun yarn 10 wound around the yarn accumulating roller 21 is unwound from the yarn accumulating roller 21, sucked by the suction nozzle 44, and discarded. As described above, in the present embodiment, the spun yarn 10 generated during the spinning reopening operation is removed by the suction nozzle 44 that guides the upper yarn to the splicer 43, and therefore the structure of the fine spinning machine 1 can be simplified.

After all the spun yarns 10 to be removed are unwound from the yarn accumulating roller 21, the unit controller 60 controls the yarn removing lever 28 to move to the lowered position as shown in fig. 8. As a result, the spun yarn 10 comes into contact with the yarn hooking member 22, and the accumulated amount of the spun yarn 10 in the yarn accumulating roller 21 gradually increases.

Subsequently, the upper yarn and the lower yarn are spliced by the splicer 43. Subsequently, the normal state shown in fig. 2 is returned, and the spun yarn 10 is wound into the package 45 again.

Next, the control of the draft ratio in the draft device 7 and the control of the yarn take-off lever 28 associated with the control will be described in detail.

The spinning machine 1 of the present embodiment is configured such that: in the spinning reopening operation, the fiber bundle 8 drafted at a predetermined draft ratio so that the spun yarn 10 of the medium yarn (for example, 30 yarns) is generated is supplied from the draft device 7 to the air-jet spinning device 9, so that the spun yarn 10 is reliably generated. Specifically, if the amount of the fiber supplied to the air-jet spinning device 9 is too small, sufficient twisting of the fiber is difficult to obtain, and the spun yarn 10 does not have strength enough to withstand the feeding of the spun yarn 10 to the downstream side, and the spun yarn 10 may fail to be produced. If the amount of the fiber supplied to the air-jet spinning device 9 is too large, the fiber may be clogged in an opening (inlet) of the air-jet spinning device 9, and the like, and the spun yarn 10 may be produced in a failure. Therefore, in the spinning machine 1 of the present embodiment, at the time of the spinning reopening operation, the draft ratio in the draft device 7 is controlled by the unit controller 60 so that the air-jet spinning device 9 generates the spun yarn 10 of the medium yarn.

The thickness of the spun yarn 10 produced by the air-jet spinning device 9 in the normal spinning operation (in other words, the draft ratio at which the draft device 7 stretches the fiber bundle 8) can be set by an operator appropriately operating the input unit 32. When it is set that a yarn finer than the medium yarn or a spun yarn 10 thicker than the medium yarn is produced in the normal spinning operation, the draft device 7 performs the draft of the fiber bundle 8 at a draft ratio different from that in the normal spinning operation in the spinning reopening operation (mode 1). When the spun yarn 10 of the medium yarn is set to be generated in the normal spinning operation, the draft device 7 is controlled so as to draft the fiber bundle 8 at the same draft ratio in both the normal spinning operation and the spinning reopening operation (mode 2).

In the above-described mode 1, since the thickness of the spun yarn 10 generated in the spinning reopening operation is different from that in the normal spinning operation, the portions of the spun yarn 10 having different thicknesses are reliably removed and the winding by the winding device 13 is reopened. This can keep the quality of the spun yarn 10 wound around the package 45 constant. In the 2 nd mode, the thickness of the spun yarn 10 is the same in both the spinning reopening operation and the normal spinning operation, and therefore the portion where the spun yarn 10 is to be removed can be shorter than in the 1 st mode.

The spinning machine 1 of the present embodiment is configured to be able to change the length of the spun yarn 10 removed from the yarn pool roller 21 by the yarn removing device 65 depending on which of the 1 st mode and the 2 nd mode the draft device 7 operates. Specifically, when the draft device 7 operates in the 2 nd mode, the unit controller 60 shortens the length of the spun yarn 10 removed from the yarn pool roller 21 by the yarn removing device 65 as compared with the case of operating in the 1 st mode. That is, when the thickness of the spun yarn 10 is the same in both the spinning reopening operation and the normal spinning operation, the length of the spun yarn 10 unwound from the yarn accumulating roller 21 and removed is shortened as compared with the case where the spun yarn 10 having a different thickness from that in the normal spinning operation is generated in the spinning reopening operation. This can prevent the spun yarn 10 from being removed more than necessary, and thus can reduce the amount of yarn return that occurs. The time required for removing the spun yarn 10 can be reduced, and therefore the cycle time can be shortened.

In the present embodiment, the length of the spun yarn 10 removed from the yarn accumulating roller 21 is changed by changing the length of time during which the yarn removing lever 28 is located at the raised position. The length of time that the yarn removal lever 28 is in the raised position can be controlled by the unit controller 60. In this way, by changing the length of time during which the yarn removing lever 28 is located at the raised position (in other words, the length of time during which the yarn removing lever 28 performs the yarn removing operation, that is, the length of the yarn removing time), the length of the spun yarn 10 removed from the yarn accumulating roller 21 can be changed by simple control.

As described above, the spinning machine 1 of the present embodiment includes the draft device 7, the air-jet spinning device 9, the yarn accumulating roller 21, the yarn removing device 65, and the unit controller 60. The draft device 7 drafts the fiber bundle 8. The air-jet spinning device 9 twists the fiber bundle 8 drafted by the draft device 7 with an air flow by a spinning reopening operation and a normal spinning operation performed after the spinning reopening operation, thereby generating a spun yarn 10. The yarn accumulating roller 21 rotates in a state where the spun yarn 10 is wound around the yarn accumulating roller and the spun yarn 10 is accumulated. The yarn removing device 65 removes the spun yarn 10 accumulated in the yarn accumulating roller 21. The unit controller 60 can change the length of the spun yarn 10 removed from the yarn accumulating roller 21 by the yarn removing device 65 according to the draft ratio at the time of the spinning reopening operation.

Accordingly, the yarn removing device 65 can remove the spun yarn 10 of an appropriate length from the yarn pool roller 21 depending on whether the draft ratio in the spinning reopening operation is different from or the same as the draft ratio in the normal spinning operation. For example, when the draft ratio in the spinning reopening operation is the same as that in the normal spinning operation, the necessity of removing the spun yarn 10 by the yarn removing device 65 is reduced. Therefore, by changing the length of the removed spun yarn 10 according to the situation as described above, the spun yarn 10 can be removed without being excessively removed, and the yarn returning amount can be reduced.

In the spinning machine 1 of the present embodiment, the draft device 7 drafts the fiber bundle 8 in any one of the 1 st mode and the 2 nd mode, and in the 1 st mode, the fiber bundle 8 is drafted at a draft ratio different between the time of the spinning reopening operation and the time of the normal spinning operation, and in the 2 nd mode, the fiber bundle 8 is drafted at the same draft ratio between the time of the spinning reopening operation and the time of the normal spinning operation. The unit controller 60 performs control so as to change the length of the spun yarn 10 removed from the yarn accumulating roller 21 by the yarn removing device 65 after the end of the spinning restart operation, depending on which of the 1 st mode and the 2 nd mode the draft device 7 drafts the fiber bundle 8.

Thus, the operation of changing the length of the spun yarn 10 removed from the yarn accumulating roller 21 by the yarn removing device 65 in accordance with the draft ratio at the time of the spinning reopening operation can be realized by simple control.

The spinning machine 1 of the present embodiment further includes a yarn hooking member 22. The yarn hooking member 22 is provided to be rotatable with respect to the yarn accumulating roller 21 and is capable of guiding the spun yarn 10. The yarn removing device 65 includes a yarn removing lever 28. The yarn removing lever 28 can perform a yarn removing operation for removing the spun yarn 10 from the yarn hooking member 22 by moving. The unit controller 60 can change the operation time length of the yarn removing lever 28 for the yarn removing operation according to which mode of the 1 st mode and the 2 nd mode the draft device 7 operates.

Thus, the length of the spun yarn 10 to be removed can be easily changed by changing the operation time length of the yarn removing lever 28.

In the spinning machine 1 of the present embodiment, the unit controller 60 can control the yarn removing operation so that the operation time length of the yarn removing lever 28 in the case of executing the 1 st mode is longer than the operation time length of the yarn removing lever 28 in the case of executing the 2 nd mode.

Thus, the spun yarn 10 can be removed longer in the case of executing the 1 st mode, and the spun yarn 10 can be removed shorter in the case of executing the 2 nd mode. As a result, the amount of wire return in the case of executing mode 2 can be reduced.

The spinning machine 1 of the present embodiment includes a draft device 7, an air spinning device 9, a yarn accumulating roller 21, a yarn hooking member 22, a yarn removing lever 28, a yarn removing device 65, and a unit controller 60. The draft device 7 drafts the drawn fiber bundle 8. The air-jet spinning device 9 twists the fiber bundle 8 drafted by the draft device 7 with an air flow to produce spun yarn 10. The yarn accumulating roller 21 rotates to wind the spun yarn 10 around and accumulate the spun yarn. The yarn hooking member 22 is provided to be rotatable with respect to the yarn accumulating roller 21 and is capable of guiding the spun yarn 10. The yarn removing lever 28 can perform a yarn removing operation for separating the spun yarn 10 from the yarn hooking member 22. The yarn removing device 65 has a suction nozzle 44, and the suction nozzle 44 has a suction port for sucking and catching the spun yarn 10. The unit controller 60 controls the yarn removal lever 28. The yarn removing lever 28 is movable between a raised position, which is a position at the time of performing the yarn removing operation, and a lowered position retracted from the raised position. The unit controller 60 can change the length of time during which the yarn removing lever 28 is located at the raised position.

Accordingly, the spun yarn 10 of an appropriate length can be removed from the yarn accumulating roller 21 by changing the length of time the yarn removing lever 28 is located at the raised position. As a result, the reduction of the amount of wire return can be achieved by simple control.

In the spinning machine 1 of the present embodiment, when the thickness of the spun yarn 10 generated by the air-jet spinning device 9 in the normal spinning operation is a fine yarn (for example, 40 yarns, 1 st thickness), the draft device 7 drafts the fiber bundle 8 in the 1 st mode so that the thickness of the fiber bundle 8 supplied to the air-jet spinning device 9 is larger in the spinning reopening operation than in the normal spinning operation. When the thickness of the spun yarn 10 generated by the air-jet spinning device 9 during the normal spinning operation is a medium yarn (i.e., the 2 nd thickness thicker than the 1 st thickness), the draft device 7 drafts the fiber bundle 8 in the 2 nd mode.

Thus, even when a thin spun yarn 10 is produced during the normal spinning operation, the spun yarn 10 starts to be produced reliably by making the draft ratio during the spinning reopening operation different from the draft ratio during the normal spinning operation.

In the spinning machine 1 of the present embodiment, when the thickness of the spun yarn 10 generated by the air-jet spinning device 9 is a medium yarn (2 nd thickness) in the normal spinning operation, the draft device 7 drafts the fiber bundle 8 in the 2 nd mode. When the thickness of the spun yarn 10 generated by the air-jet spinning device 9 in the normal spinning operation is a thick yarn (i.e., the 3 rd thickness thicker than the 2 nd thickness), the draft device 7 drafts the fiber bundle 8 in the 1 st mode so that the thickness of the fiber bundle 8 supplied to the air-jet spinning device 9 is thinner in the spinning reopening operation than in the normal spinning operation. Specifically, in this case, for example, the mode 1 is executed by driving the draft device 7 so that the rotational speed of the rear roller pair 16 is lower in the spinning reopening operation than in the normal spinning operation.

Thus, even when a thick spun yarn 10 is produced during a normal spinning operation, the spun yarn 10 starts to be produced reliably by making the draft ratio during the spinning reopening operation different from the draft ratio during the normal spinning operation.

The spinning machine 1 of the present embodiment includes a winding device 13 and a splicer 43. The winding device 13 winds the spun yarn 10 around a package 45. The splicer 43 splices the yarn end of the spun yarn 10 (upper yarn) from the air-jet spinning device 9 and the yarn end of the spun yarn 10 (lower yarn) from the winding device 13 in the traveling direction of the spun yarn 10 and at a position between the air-jet spinning device 9 and the winding device 13. The yarn removing device 65 sucks the spun yarn 10 removed from the yarn accumulating roller 21 and removes at least the spun yarn 10 generated by the air-jet spinning device 9 at the time of the spinning reopening operation of the draft device 7. The yarn removing device 65 sucks and catches the spun yarn 10 from the air-jet spinning device 9 and guides the spun yarn to the splicer 43 during the yarn re-opening operation.

Accordingly, the spun yarn 10 generated from the fiber bundle 8 drafted at the draft ratio different from that in the normal spinning operation can be removed from the spun yarn 10 generated in the normal spinning operation and then spliced, and the spun yarn 10 can be wound, so that a high-quality package 45 can be formed. Further, since the spun yarn 10 as described above is removed by the yarn removing device 65, the structure of the spinning machine 1 can be simplified.

The spinning machine 1 of the present embodiment directly draws out the spun yarn 10 from the air-jet spinning device 9 by the yarn accumulating roller 21.

This allows the spun yarn 10 to be stored while being pulled out with a stable tension from the air-jet spinning device 9. The "direct drawing" refers to another configuration in which the spun yarn 10 is drawn out from the air-jet spinning device 9 without a delivery roller or a nip roller between the air-jet spinning device 9 and the yarn accumulating roller 21.

The spinning machine 1 of the present embodiment further includes an input unit 32. The input section 32 can set the thickness of the spun yarn 10 generated by the air-jet spinning device 9 and/or the spinning speed at which the spun yarn 10 is generated by the air-jet spinning device 9.

Thus, the spun yarn 10 of an appropriate length can be removed according to the draft ratio at the time of the yarn re-opening operation by a simple operation of the input section 32.

Next, a modified example of the present invention will be described. In the description of the present modification, the same or similar components as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

In the present modification, the unit controller 60 controls the operation of the yarn removing lever 28 so that the operation time length of the yarn removing operation performed by the yarn removing lever 28 is changed in conjunction with the set spinning speed in accordance with the spinning speed set by the input unit 32 (the operation time length of the yarn removing operation is substantially inversely proportional to the spinning speed). In other words, even in the 1 st mode, when the spinning speed by the air-jet spinning device 9 exceeds the predetermined speed, the unit controller 60 performs the yarn removing operation of the yarn removing lever 28 in a short time (1 st time length) at the time of the spinning restart operation, and when the speed is lower than the predetermined speed, the unit controller 60 performs control so as to perform the yarn removing operation in a long time (2 nd time length longer than the 1 st time length). The unit controller 60 performs the same control in the case of the 2 nd mode. According to this control, even if the spinning speed of the air-jet spinning device 9 is different, an appropriate amount of the spun yarn 10 can be removed at the time of the spinning reopening operation.

In the spinning machine 1 of the present modification, the unit controller 60 controls the yarn removing device 65 to remove the spun yarn 10 over the 1 st time period when the spinning speed at which the air-jet spinning device 9 generates the spun yarn 10 is higher than the predetermined speed. The unit controller 60 controls the yarn removing device 65 to remove the spun yarn 10 over a 2 nd time period longer than a 1 st time period when the spinning speed is slower than the predetermined speed.

Thus, the time for removing the spun yarn 10 can be shortened when the spinning speed is high, and the time for removing the spun yarn 10 can be lengthened when the spinning speed is low. As a result, even if the spinning speed is different, a certain amount of the spun yarn 10 can be removed at the time of the spinning reopening operation.

While the preferred embodiments of the present invention have been described above, the above configuration can be modified as follows, for example.

The draft ratio of the draft device 7 at the time of the spinning reopening operation is not limited to the draft ratio set to generate the spun yarn 10 corresponding to the medium yarn as in the above-described embodiment, and can be appropriately changed in consideration of the configuration of the air-jet spinning device 9 and the like.

In the above embodiment, the intermediate roller pair 19 and the front roller pair 20 of the draft device 7 are driven by a motor common to the plurality of spinning units 2. Therefore, the draft ratio of the draft device 7 is changed by changing the rotation speed of the rear roller pair 16 and the third roller pair 17. However, the intermediate roller pair 19 and the front roller pair 20 may be configured to be driven independently for each spinning unit 2. In this case, the draft ratio of the draft device 7 can be changed by changing the rotational speed of the intermediate roller pair 19 and/or the front roller pair 20.

In the above modification, the unit controller 60 controls the operation time length of the yarn removing operation by the yarn removing lever 28 according to both the draft ratio and the spinning speed. However, the unit controller 60 may control the operation time length of the yarn removing operation according to the spinning speed regardless of the draft ratio. The operation time length of the yarn removing operation may be controlled based on other parameters, which are neither the draft ratio nor the spinning speed.

In the above-described embodiment and modification, the devices constituting the spinning unit 2, such as the draft device 7 and the air-jet spinning device 9, are controlled by the unit controller 60 provided in each spinning unit 2. The unit controller 60 may be provided for every predetermined number of the spinning units 2. Further, a part or all of the devices may be controlled by the body control device 30. The joint carriage 3 may be provided with a carriage control unit, and each device of the joint carriage 3 may be controlled by the carriage control unit that receives a control signal from the unit controller 60 or the machine body control device 30.

In the above-described embodiment and modification, the push-up arm 47 and the pneumatic cylinder 49 are provided on the yarn removing lever 3 as means for driving the yarn removing lever 28, but each spinning unit 2 may be provided with a structure for driving the yarn removing lever 28, for example. Instead of the pneumatic cylinder 49, the yarn removing lever 28 may be moved by an appropriate mechanism such as a rack and pinion mechanism or a cam mechanism.

In the above-described embodiment and modification, the yarn accumulating roller 21 and the yarn hooking member 22 are configured to be integrally rotatable by driving the motor 25 provided in the yarn accumulating roller 21 by means of the magnetic means provided between the yarn accumulating roller 21 and the yarn hooking member 22. However, instead of this configuration, the yarn accumulating roller 21 and the yarn hooking member 22 may be driven by dedicated motors.

In the above-described embodiment and modification, in the generation of the spun yarn 10 in the air-jet spinning device 9, the whirling air flow generating nozzle operates in the normal spinning operation, and the whirling air flow generating nozzle and the auxiliary nozzle operate in the spinning reopening operation. In the normal spinning operation, the auxiliary nozzle may be configured to operate in a weaker state than in the spinning reopening operation, in addition to the operation of the whirling air flow generating nozzle.

In the above-described embodiment and modification, when the yarn quality monitoring device 52 detects a yarn defect, the spun yarn 10 is cut by stopping the spinning by the air-jet spinning device 9, but instead, the spun yarn 10 may be cut by a cutter provided at an appropriate position.

In the above-described embodiment, the splicer 43 is provided as the splicing device in the spinning machine 1, but instead of the splicer 43, for example, a splicer may be provided.

Claims

1. A spinning machine is characterized by comprising:

a drafting device for drafting the fiber bundle;

an air-jet spinning device that twists the fiber bundle drafted by the draft device with an air flow to generate a spun yarn by a spinning reopening operation and a normal spinning operation performed after the spinning reopening operation;

a yarn accumulating roller that rotates in a state in which the spun yarn is wound around and accumulated;

a yarn removing device for removing the spun yarn accumulated in the yarn accumulating roller; and

a control section capable of changing the length of the filament yarn removed from the yarn accumulating roller by the yarn removing device in accordance with a draft ratio at the time of the spinning reopening operation,

the draft device drafts the fiber bundle in any one of a 1 st mode and a 2 nd mode, wherein in the 1 st mode, the fiber bundle is drafted at a draft ratio different between the time of the spinning reopening operation and the time of the normal spinning operation, and in the 2 nd mode, the fiber bundle is drafted at the time of the spinning reopening operation and the time of the normal spinning operation at the same draft ratio,

the control unit controls to change the length of the filament yarn removed from the yarn accumulating roller by the yarn removing device after the spinning reopening operation is completed, depending on which of the 1 st mode and the 2 nd mode the draft device drafts the fiber bundle.

2. Spinning machine according to claim 1,

further comprising a yarn hooking member provided to be rotatable with respect to the yarn accumulating roller and capable of guiding the spun yarn,

the yarn removing device includes a yarn removing member capable of performing a yarn removing operation of removing the spun yarn from the yarn hooking member by movement,

the control unit may change an operation time length of the yarn removing member to perform the yarn removing operation according to which mode of the 1 st mode and the 2 nd mode the draft device operates.

3. Spinning machine according to claim 2,

the control unit controls the yarn removing operation such that the operation time length of the yarn removing member in the case where the 1 st mode is executed is longer than the operation time length of the yarn removing member in the case where the 2 nd mode is executed.

4. Spinning machine according to claim 1,

when the thickness of the spun yarn generated by the air-jet spinning device during a normal spinning operation is 1 st thickness, the draft device drafts the fiber bundle in the 1 st mode so that the thickness of the fiber bundle supplied to the air-jet spinning device is larger during the spinning reopening operation than during the normal spinning operation,

in the case where the spun yarn generated by the air-jet spinning device during the normal spinning operation has a thickness of 2 nd thickness that is thicker than the 1 st thickness, the draft device drafts the fiber bundle in the 2 nd mode.

5. Spinning machine according to claim 2,

6. Spinning machine according to claim 3,

7. Spinning machine according to claim 1,

the draft device drafts the fiber bundle in the 2 nd mode when the thickness of the spun yarn generated by the air-jet spinning device during a normal spinning operation is the 2 nd thickness,

when the thickness of the spun yarn generated by the air-jet spinning device during the normal spinning operation is the 3 rd thickness which is thicker than the 2 nd thickness, the draft device drafts the fiber bundle in the 1 st mode so that the thickness of the fiber bundle supplied to the air-jet spinning device is thinner during the spinning reopening operation than during the normal spinning operation.

8. Spinning machine according to claim 2,

9. Spinning machine according to claim 3,

10. Spinning machine according to claim 4,

11. Spinning machine according to claim 5,

12. Spinning machine according to claim 6,

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

the control section controls the yarn removing device to remove the spun yarn over a 1 st time period when a spinning speed of the air-jet spinning device to generate the spun yarn is higher than a predetermined speed,

the control unit controls the yarn removing device to remove the spun yarn over a 2 nd time period longer than the 1 st time period when the spinning speed is slower than the predetermined speed.

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

the disclosed device is provided with:

a winding device for winding the spun yarn into a package; and

a yarn splicing device that splices a yarn end of the spun yarn from the air-jet spinning device and a yarn end of the spun yarn from the winding device in a traveling direction of the spun yarn at a position between the air-jet spinning device and the winding device,

the yarn removing device sucks the spun yarn removed from the yarn accumulating roller, removes at least the spun yarn generated by the air-jet spinning device at the time of a spinning reopening operation of the draft device, and then guides the spun yarn to the yarn splicing device.

15. Spinning machine according to claim 13,

the disclosed device is provided with:

a winding device for winding the spun yarn into a package; and

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

the spun yarn is directly drawn out from the air-jet spinning device by the yarn accumulating roller.

17. Spinning machine according to claim 13,

18. Spinning machine according to claim 14,

19. Spinning machine according to claim 15,

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

the spinning device further includes a setting unit that sets at least one of a thickness and a spinning speed of the spun yarn generated by the air-jet spinning device.

21. Spinning machine according to claim 13,

22. Spinning machine according to claim 14,

23. Spinning machine according to claim 15,

24. Spinning machine according to claim 16,

25. Spinning machine according to claim 17,

26. Spinning machine according to claim 18,

27. Spinning machine according to claim 19,

28. A spinning machine is characterized by comprising:

a draft device for performing draft for drawing the fiber bundle;

an air-jet spinning device for twisting the fiber bundle drafted by the draft device with an air flow to produce spun yarn;

a yarn storage roller for winding the spun yarn around the yarn storage roller by rotation and storing the spun yarn;

a yarn hooking member provided to be rotatable with respect to the yarn accumulating roller and capable of guiding the spun yarn;

a yarn removing member capable of performing a yarn removing operation for separating the spun yarn from the yarn hooking member;

a yarn removing device including a yarn removing member having a suction port for sucking and catching the spun yarn; and

a control unit for controlling the yarn removing member,

the yarn removing member is movable between a yarn removing position that is a position at the time of the yarn removing operation and a retracted position retracted from the yarn removing position,

the control unit may change a length of time during which the yarn removing member is positioned at the yarn removing position,

29. Spinning machine according to claim 28,

the disclosed device is provided with:

a winding device for winding the spun yarn into a package; and

30. Spinning machine according to claim 28,

31. Spinning machine according to claim 29,

32. A spinning machine according to any one of claims 28 to 31,

33. Spinning machine according to claim 28,

in the case where the thickness of the spun yarn is the same in both the spinning reopening operation and the normal spinning operation, the length of the spun yarn unwound from the yarn accumulating roller and removed is shortened as compared with the case where the spun yarn having a different thickness from that in the normal spinning operation is generated in the spinning reopening operation.