阅读说明：本技术 纱线卷绕装置及纱线捕捉方法 (Yarn winding device and yarn catching method ) 是由 寺尾雄帆 村山贤一 山本厚志 上山翔太 于 2020-09-29 设计创作，主要内容包括：本发明提供纱线卷绕装置及纱线捕捉方法。自动络纱机的上纱线捕捉管在由卷绕部卷绕的纱线断开的情况下,通过吸引而从卷装捕捉纱线。单元控制部控制卷装驱动马达。单元控制部在上纱线捕捉管开始了上纱线的吸引的情况下使驱动部进行正反往复驱动,该正反往复驱动将使卷装向纱线的卷绕方向旋转的正驱动、和使卷装以比正旋转的旋转量大的旋转量向所述卷绕方向的反方向旋转的反驱动从正驱动或反驱动开始进行。(The invention provides a yarn winding device and a yarn catching method. When the yarn wound by the winding section is broken, the upper yarn catching tube of the automatic winder catches the yarn from the package by suction. The unit control section controls the package driving motor. The unit control section causes the drive section to perform forward and reverse reciprocating drive, which starts forward drive for rotating the package in a yarn winding direction and reverse drive for rotating the package in a reverse direction of the yarn winding direction by a rotation amount larger than a rotation amount of the forward rotation, when the suction of the upper yarn is started by the upper yarn catching tube.)

1. A yarn winding device is characterized by comprising:

a winding section that winds the yarn to form a package;

a driving unit configured to rotationally drive the package and switch a rotational direction of the package between a forward rotational direction in which the package is rotated in a yarn winding direction and a reverse rotational direction in which the package is rotated in a direction opposite to the yarn winding direction;

a yarn catching section that catches the yarn from the package by suction when the yarn wound by the winding section is cut; and

a control section that controls the drive section,

the control unit causes the driving unit to perform forward and reverse reciprocating driving including forward driving for rotating the package in the forward rotation direction at a first angle and reverse driving for rotating the package in the reverse rotation direction at a second angle larger than a rotation angle of the forward driving, when the yarn catching unit starts the suction of the yarn on the package side.

2. The yarn winding device according to claim 1,

the control unit causes the drive unit to perform reciprocating repetitive drive for repeating the forward and reverse reciprocating drive a plurality of times.

3. The yarn winding device according to claim 2,

the control unit causes the driving unit to perform the reciprocating repetitive driving until the package rotates backward at least one rotation from a start time point of the forward and backward reciprocating driving by the repetition of the forward and backward reciprocating driving.

4. The yarn winding device according to claim 3,

the control unit reduces the speed of forward driving and backward driving the package and performs the reciprocation drive again when the yarn catching unit fails to catch the yarn after performing the reciprocation drive at least once on the package.

5. The yarn winding device according to claim 3,

the control unit reduces the speed of forward and backward driving of the package and performs the forward and backward reciprocating driving again when the yarn catching unit fails to catch the yarn after the forward and backward reciprocating driving of the package is performed at least once in the reciprocating repetitive driving.

6. The yarn winding device according to any one of claims 2 to 5,

the control unit controls the rotation speed of the package to be driven forward and backward when the driving unit repeatedly reciprocates the yarn winding unit to be slower than the rotation speed of the package when the yarn is wound to form the package.

7. The yarn winding device according to any one of claims 2 to 6,

the amount of the rotational angle of the package in the forward driving included in one of the forward and reverse reciprocating driving in the reciprocating repetitive driving is within one rotation.

8. The yarn winding device according to any one of claims 2 to 7,

the yarn winding device includes a detection unit for detecting whether or not a yarn is present in the yarn catching unit,

the control unit causes the detection unit to perform a detection operation of whether or not a yarn is present in the yarn catching unit on the yarn catching unit in parallel with the execution of the reciprocating repetitive drive, and terminates the reciprocating repetitive drive when it is determined that the yarn catching unit has successfully caught the yarn based on a detection result of the detection unit,

the control unit determines that the yarn capturing unit fails to capture the yarn when the number of times the forward and reverse reciprocating drive is performed or an elapsed period from a start time point of the reciprocating repetitive drive reaches a preset limit value even if it is determined that the yarn capturing unit has not successfully captured the yarn based on a detection result of the detection unit, and ends the reciprocating repetitive drive.

9. The yarn winding device according to claim 8,

the alarm device is provided with an alarm part,

the alarm unit issues an alarm when the reciprocating repetitive driving is completed because the number of times of execution of the forward and reverse reciprocating driving or an elapsed period from a start time point of the reciprocating repetitive driving reaches the limit value.

10. The yarn winding device according to any one of claims 2 to 9,

the yarn winding device includes a notification unit that notifies that the package is repeatedly driven in a reciprocating manner.

11. The yarn winding device according to any one of claims 1 to 9,

the winding section includes a winding tube having a spiral traverse groove formed on an outer peripheral surface thereof that is in contact with an outer periphery of the package and rotates the package,

the driving unit drives the winding drum to rotate the package.

12. A yarn catching method, comprising:

a winding step of winding the yarn to form a package; and

a catching step of catching and drawing out the yarn from the package for yarn splicing when the yarn is cut off in the middle of the winding step,

in the catching step, forward and reverse reciprocating driving including forward driving for rotating the package in a winding direction of the yarn and reverse driving for rotating the package in a reverse direction of the winding direction by a rotation amount larger than the rotation amount of the forward driving is performed a plurality of times.

Technical Field

The present invention relates to a yarn winding device and a yarn catching method.

Background

Conventionally, a yarn winding device that winds a yarn to form a package is known. Japanese patent No. 4277227 discloses an automatic winder as such a yarn winding device.

In the automatic winder disclosed in japanese patent No. 4277227, the winding unit unwinds the spun yarn from the yarn supplying bobbin and rewinds a predetermined amount of the yarn to the winding package to form the winding package. At this time, when the yarn supplied from the yarn supplying bobbin is cut halfway, the winding unit draws and captures the yarn on the winding package side by the suction nozzle, guides the yarn to the yarn splicing device, and performs yarn splicing by the yarn splicing device. Here, the suction nozzle sucks and catches the yarn on the package side to draw the yarn end from the winding package (so-called end-finding).

When the suction nozzle sucks and catches the yarn on the winding package side, the winding package rotates in the forward direction (winding direction) for a predetermined number of rotations (or a predetermined time), and thereafter, the winding package rotates in the reverse direction of the forward direction. In relation to the relationship between the amount of rotation by which the winding package is rotated in the forward direction in a state where the suction nozzle is close to the winding package and the amount of rotation by which the winding package is rotated in the reverse direction in the same state, japanese patent No. 4277227 is not particularly mentioned.

Disclosure of Invention

With regard to the automatic winder of japanese patent No. 4277227, it is assumed that: when the yarn is broken between the yarn supplying bobbin side and the winding package when rewinding the yarn, if the winding package is rotated in the forward direction and then rotated in the reverse direction with the suction nozzle being close to the winding package, the suction nozzle can suck and catch the yarn from the end portion of the yarn rather than the intermediate portion. However, for example, in a state where the yarn of the winding package is firmly hooked on the surface portion of the package due to a large amount of hairiness of the yarn, even if the winding package is rotated only in the forward direction and the reverse direction and the suction action is applied to the end portion of the yarn as described above, the hooking of the yarn of the winding package cannot be released, and the yarn cannot be caught in some cases. In this case, since the unwinding operation of unwinding the yarn wound around the package side needs to be performed by the hand of the operator, the labor of the operator increases. Further, since the formation of the winding package by the winding unit has to be stopped until the operator performs the unwinding operation, the operation efficiency of the winding unit is lowered.

The present invention has been made in view of the above circumstances, and an object thereof is to efficiently catch a yarn from a package.

As described above, the following describes a solution to the problem and effects thereof.

According to a first aspect of the present invention, there is provided a yarn winding device configured as follows. That is, the yarn winding device includes a winding unit, a driving unit, a yarn catching unit, and a control unit. The winding section winds the yarn to form a package. The driving section is configured to rotationally drive the package and is configured to be capable of switching a rotational direction of the package between a forward rotational direction in which the package is rotated in a yarn winding direction and a reverse rotational direction in which the package is rotated in a direction opposite to the yarn winding direction. The yarn catching section catches the yarn from the package by suction when the yarn wound by the winding section is cut. The control unit controls the drive unit. The control unit causes the driving unit to perform forward and reverse reciprocating driving including forward driving for rotating the package at a first angle in a forward rotation direction which is a winding direction of the yarn and reverse driving for rotating the package at a second angle larger than a rotation angle of the forward driving in the reverse rotation direction, when the yarn catching unit starts the suction of the yarn on the package side.

Thus, by driving the package forward and backward, it is possible to provide a good stimulus to the yarn on the package side based on the catching action of the yarn catching section and the like. Further, in the forward and backward reciprocating drive, the package is reversely driven by a rotation amount larger than that of the forward drive, and therefore, it is expected that the yarn catching section or the like applies an asymmetric stimulus to the yarn on the package side and the unwinding of the yarn is promoted. Therefore, even if the yarn is firmly hooked to the surface of the package, the hooking can be easily released and the yarn on the package side can be efficiently caught.

In the yarn winding device, it is preferable that the control unit causes the driving unit to perform reciprocating repetitive driving in which the forward and backward reciprocating driving is repeated a plurality of times.

This can secure a plurality of opportunities to release the yarn from being caught, and therefore the yarn on the package side can be easily caught. Further, since the package is reversely driven in stages every time the forward and reverse reciprocating driving is completed, it is possible to provide more various stimuli to the yarn on the package side by the yarn catching section, and it is possible to cause the yarn catching section to act on a large area of the outer periphery of the package.

In the yarn winding device, it is preferable that the control section causes the driving section to perform the reciprocating repetitive driving until the package rotates in reverse at least one rotation from a start time point of the forward and reverse reciprocating driving by repetition of the forward and reverse reciprocating driving.

Thus, the yarn catching section can be made to act on the entire outer periphery of the package by repeating the reciprocating driving.

In the yarn winding device, the control unit may reduce the speed of forward driving and reverse driving of the package and perform the reciprocating repetitive driving again when the yarn catching unit fails to catch the yarn after the reciprocating repetitive driving of the package is performed at least once.

Accordingly, the rotation speed of the forward and reverse reciprocating drive in the reciprocating repetitive drive is automatically reduced in a situation where it is expected that the yarn is difficult to catch, and therefore the probability that the yarn can be caught thereafter can be improved.

In the yarn winding device, it is preferable that the control unit performs the forward and backward reciprocating drive again by slowing down the forward and backward driving speeds of the package when the yarn catching unit fails to catch the yarn after performing the forward and backward reciprocating drive at least once on the package in the reciprocating repetitive drive.

Accordingly, the rotation speed of the forward and reverse reciprocating drive is automatically reduced in a situation where it is expected that the yarn catching is difficult, and therefore the probability that the yarn can be caught thereafter can be improved.

In the yarn winding device, it is preferable that the control section controls the driving section to perform the reciprocating repetitive driving so that the rotational speed of the package in the forward driving and the reverse driving is slower than the rotational speed of the package in the winding of the yarn to form the package.

Thus, the yarn catching section can be effectively operated for catching the yarn at the package side.

In the yarn winding device, it is preferable that the amount of the rotational angle of the package in the forward driving included in one of the forward and reverse reciprocating driving in the reciprocating repetitive driving is within one rotation.

Accordingly, the amount of the rotational angle of the forward and backward reciprocating drive of the package is relatively small, and thus vibration and the like generated from the yarn winding device can be reduced.

The yarn winding device preferably has the following configuration. That is, the yarn winding device includes a detection unit that detects whether or not the yarn is present in the yarn catching unit. The control unit causes the detection unit to perform a detection operation of whether or not the yarn is present in the yarn catching unit on the yarn catching unit in parallel with the execution of the reciprocating repetitive drive, and terminates the reciprocating repetitive drive when it is determined that the yarn catching unit has successfully caught the yarn based on a detection result of the detection unit. The control unit determines that the yarn capturing unit fails to capture the yarn and ends the reciprocation drive when the number of times the forward and reverse reciprocation drive is performed or an elapsed period from a start time point of the reciprocation drive reaches a preset limit value even when it is determined that the yarn capturing unit has not successfully captured the yarn based on a detection result of the detection unit.

With this, after the yarn catching section successfully catches the yarn on the package side, the next operation can be smoothly started. Further, when the yarn catching section has a low possibility of successfully catching the yarn, wasteful forward and backward reciprocating driving of the package can be prevented.

The yarn winding device preferably has the following configuration. That is, the yarn winding device includes an alarm portion. The alarm unit may issue an alarm when the reciprocating repetitive driving is completed because the number of times of execution of the forward and reverse reciprocating driving or an elapsed period from a start time point of the reciprocating repetitive driving reaches the limit value.

This makes it possible to promptly notify the operator or the like that the reciprocating repetitive driving is completed because the yarn catching section has a low possibility of successfully catching the yarn in the future.

Preferably, the yarn winding device includes a notification unit that notifies that the package is repeatedly driven in a reciprocating manner.

This makes it possible for the surrounding operator or the like to easily recognize that the yarn is repeatedly driven in the reciprocating manner to catch the yarn on the package side.

Preferably, the winding section includes a winding tube having a spiral traverse groove formed on an outer peripheral surface thereof, the winding tube being in contact with an outer periphery of the package to rotate the package, and the driving section drives the winding tube to rotate the package.

Since the package is rotated by the winding tube having the spiral traverse groove formed on the outer peripheral surface, the rotation of the package and the traverse do not deviate even if the driving section is driven to reciprocate forward and backward.

According to a second aspect of the present invention, the following yarn trapping method is provided. That is, the yarn catching method includes a winding step and a catching step. The winding step winds the yarn to form a package. The catching step catches and draws the yarn from the package for yarn splicing when the yarn is broken during the winding step. In the catching step, forward and reverse reciprocating driving including forward driving for rotating the package in a winding direction of the yarn and reverse driving for rotating the package in a reverse direction of the winding direction by a rotation amount larger than a rotation amount of the forward driving is performed a plurality of times.

Thus, by driving the package forward and backward, a good stimulus can be given to the yarn on the package side by the yarn catching section and the like. Further, in the forward and backward reciprocating drive, the package is reversely driven by a rotation amount larger than that of the forward drive, and therefore, it is expected that the yarn catching section or the like applies an asymmetric stimulus to the yarn on the package side to promote unwinding of the yarn. In addition, the forward and reverse reciprocating drive can ensure the opportunity of releasing the yarn hooking for many times. Therefore, even if the yarn is firmly hooked to the surface of the package, the hooking can be easily released and the yarn on the package side can be efficiently caught.

Drawings

Fig. 1 is a schematic front view showing an overall configuration of an automatic winder according to a first embodiment of the present invention.

Fig. 2 is a front view and a block diagram showing a schematic configuration of the winder unit.

Fig. 3 is a side view showing a state in which the yarn end on the package side is guided to the yarn splicing device when the yarn is cut in the winder unit.

Fig. 4 is a flowchart showing a process performed to form a package in the winder unit.

Fig. 5 is an enlarged side view illustrating the effect of the forward and reverse reciprocating driving of the package.

Fig. 6 is a timing chart showing an example of the rotation control of the package in the winder unit.

Fig. 7 is a front view and a block diagram showing a schematic configuration of an automatic winder according to a second embodiment of the present invention.

Detailed Description

Next, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a schematic front view showing an overall configuration of an automatic winder 100 according to a first embodiment of the present invention.

An automatic winder (yarn winding device) 100 shown in fig. 1 includes a plurality of winder units 10 arranged in parallel, a blower case 70, a machine control device 80, and a doffer 90.

A blower, not shown, is disposed inside the blower case 70. The blower functions as a negative pressure source for supplying a negative pressure to each winder unit 10 via a blower duct.

The machine station control device 80 includes operation keys (operation unit) 81 and a display (alarm unit, notification unit) 82, and is configured to be able to communicate with each winder unit 10. The operator of the automatic winder 100 can input a predetermined set value and select an appropriate control method by operating the operation key 81. This enables the plurality of winder units 10 to be managed collectively. In addition, the machine control device 80 controls the operation of the doffing device 90. The display 82 can display the winding state of the yarn 12 and the content of the generated abnormality in each winder unit 10.

The doffing device 90 is configured to travel to a position of the winder unit 10 when the package 20 is fully wound (in a state where a predetermined amount of the yarn 12 is wound) in the winder unit 10, remove the fully wound package 20, and place an empty winding bobbin 22.

Next, the structure of the winder unit 10 will be described with reference to fig. 2 and 3. Fig. 2 is a front view and a block diagram showing a schematic configuration of the winder unit 10. Fig. 3 is a side view showing a state where the yarn end is guided to the yarn joining device 3 in a state where the yarn 12 is broken in the winder unit 10.

As shown in fig. 2, each winder unit 10 includes a winder unit body 40 having a yarn supplying section 1 and a winding section 2, and a unit controller (controller) 50. The winding unit 10 unwinds the yarn 12 supplied to the yarn supplying bobbin 11 of the yarn supplying portion 1, and winds the unwound yarn 12 around the winding bobbin 22 while traversing (converting) the yarn to form a package 20. In the following description, the rotation in the winding direction of the wound yarn 12 is sometimes referred to as "forward driving" and the rotation in the reverse direction is sometimes referred to as "reverse driving" with respect to the package 20.

The unit control unit 50 includes, for example, a CPU and a ROM. A program, a control table, and the like for controlling the respective configurations of the winding unit main body 40 are stored in the ROM. The CPU executes the program stored in the ROM.

The yarn supplying portion 1 can support a yarn supplying bobbin 11 placed on a not-shown conveyance tray at a predetermined position and unwind a yarn 12 from the yarn supplying bobbin 11. The yarn supplying portion 1 can discharge an empty yarn supplying bobbin 11 when all the yarns 12 are unwound from the yarn supplying bobbin 11, and receive supply of a new yarn supplying bobbin 11 from a yarn supplying bobbin supplying device, not shown. The yarn supplying section 1 is not limited to the above-described conveyance tray type, and may be, for example, a magazine type yarn supplying section that supports a yarn supplying bobbin supplied from a magazine at a predetermined position and unwinds and supplies the yarn 12.

The winding portion 2 is provided at an upper portion of the winding unit main body 40. The winding section 2 includes: a cradle 21 configured to hold a winding bobbin 22; a winding drum (traverse drum) 23 for traversing the yarn 12 and rotating the winding bobbin 22; and a first motor (driving unit) 29 for rotationally driving the winding drum 23. A spiral traverse groove 27 is formed in the outer peripheral surface of the winding tube 23, and when the winding tube 23 is rotated by the first motor 29, the yarn 12 unwound from the yarn supplying bobbin 11 in the yarn supplying portion 1 is wound around the winding bobbin 22 while being traversed by the traverse groove 27 at a constant width. This enables the formation of a package 20 having a predetermined length (or a predetermined weight) and a constant winding width. In this case, the first motor 29 can rotationally drive the package 20 and can switch the rotational direction of the package 20.

In the winder unit 10, an unwinding assisting device 13, a tension applying device 14, a lower yarn catching tube 4, a yarn splicing device 3, a yarn monitoring device 19, and an upper yarn catching tube (yarn catching section) 5 are arranged in a yarn running path between the yarn supplying section 1 and the winding section 2.

The unwinding assisting device 13 includes a regulating member 13a that can be covered on the core tube of the yarn supplying bobbin 11. The regulating member 13a is formed in a substantially cylindrical shape, and is disposed so as to contact a balloon formed on the upper portion of the yarn layer of the yarn supplying bobbin 11. The balloon means a portion where the yarn 12 unwound from the yarn supplying bobbin 11 swings due to centrifugal force.

The restricting member 13a is brought into contact with the balloon to apply tension to the yarn 12 in the balloon portion, thereby preventing the yarn 12 from excessively swinging. This enables the yarn 12 to be appropriately unwound from the yarn supplying bobbin 11.

The tension applying device 14 applies a predetermined tension to the advancing yarn 12. In the present embodiment, the tension applying device 14 has a gate structure in which movable comb teeth are arranged with respect to fixed comb teeth. The movable comb teeth are biased so that the comb teeth are engaged with each other.

By passing the yarn 12 between the meshing comb teeth while bending, an appropriate tension can be applied to the yarn 12 to improve the quality of the package 20. However, the tension applying device 14 is not limited to the above-described gate-type structure, and a disk-type structure, for example, can be employed.

The lower yarn catching tube 4 can attract and catch the yarn 12 (yarn end) on the yarn supplying bobbin 11 side when the yarn 12 is cut for some reason (yarn breakage, yarn cutting, or the like) between the yarn supplying section 1 and the winding section 2, and then guide the yarn to the yarn splicing device 3.

Specifically, the lower yarn catching tube 4 is configured to be rotatable about the tube shaft 41. A suction port 42 is formed at the front end of the lower yarn catching tube 4. A suitable negative pressure source is connected to the lower yarn catching tube 4, and a suction flow can be applied to the suction port 42.

In this configuration, when the yarn 12 is broken, the suction port 42 of the lower yarn catching tube 4 catches the lower yarn, which is the yarn on the side of the yarn supplying portion 1, of the yarn 12 at a position shown by a two-dot chain line in fig. 3, and thereafter, the lower yarn catching tube 4 is rotated upward around the tube shaft 41 to guide the lower yarn to the yarn joining device 3.

The yarn joining device 3 joins the yarn 12 (yarn end) on the yarn supplying section 1 side and the yarn 12 (yarn end) on the winding section 2 side when the yarn 12 is cut as described above. In the present embodiment, the yarn splicing device 3 is configured as a splicing device that splices yarn ends together by utilizing a swirling air flow generated by compressed air. However, the yarn splicing device 3 is not limited to the above splicing device, and a disk splicer, a mechanical yarn knotting device, or a knotter, for example, can be used.

The yarn monitoring device 19 detects a yarn defect by monitoring the thickness of the running yarn 12 and the like with an appropriate sensor. The yarn monitoring device 19 also detects yarn breakage, that is, the presence or absence of the yarn 12 in the yarn running path. A cutter 24 for cutting the yarn 12 immediately when the yarn monitor 19 detects a yarn defect is provided in the vicinity of the yarn monitor 19.

The upper yarn catching tube 5 can suck and catch the yarn 12 (yarn end) on the winding section 2 side when the yarn 12 is cut as described above, and can guide the caught yarn 12 to the yarn splicing device 3.

Specifically, the upper yarn catching tube 5 is configured to be rotatable about the shaft 51. A suction nozzle 52 is formed at the front end of the upper yarn catching tube 5. The blower duct described above is connected to the upper yarn catching tube 5, and a suction flow can be applied to the suction nozzle 52.

The suction nozzle 52 is formed to be elongated to include the winding width of the package 20. This enables the suction flow to act on the outer peripheral surface of the package 20 in the entire winding width direction.

A baffle member, not shown, is disposed between the suction nozzle 52 of the upper yarn catching pipe 5 and the blower duct. The shutter member is controlled to open and close by the unit control unit 50. The shutter member is opened and closed to switch between generation and stop of the suction flow in the suction nozzle 52.

An output shaft of the second motor 62 is connected to the upper yarn catching pipe 5. The second motor 62 is electrically connected to the unit control section 50. The unit control unit 50 can control the second motor 62 to start/stop rotation of the second motor 62 or change the rotation direction.

In this configuration, when the yarn 12 is broken, the suction nozzle 52 of the upper yarn catching tube 5 catches the yarn on the winding portion 2 side of the yarn 12, that is, the upper yarn at the upper yarn catching position shown by the two-dot chain line in fig. 3. Thereafter, the upper yarn catching tube 5 guides the upper yarn to the yarn splicing device 3 by rotating about the shaft 51 to the yarn splicing position shown by the solid line in fig. 3.

The winder unit 10 is provided with a yarn detection sensor (detection unit) 53. The yarn detection sensor 53 detects whether or not the yarn is captured by the upper yarn capturing tube 5. Specifically, the yarn detection sensor 53 detects whether or not a yarn (yarn end) is present inside the upper yarn catching tube 5. The yarn detection sensor 53 is electrically connected to the unit control unit 50. The yarn detection sensor 53 can be configured as an optical sensor, for example. The yarn detection sensor 53 is disposed in the vicinity of the winding portion 2. The yarn detection sensor 53 is configured as a known optical sensor, and includes a light projecting portion and a light receiving portion, which are not shown. A part of the upper yarn catching tube 5 is formed of a transparent member that can transmit light. When the upper yarn catching tube 5 is positioned at the upper yarn catching position, the light projecting portion of the yarn detecting sensor 53 can irradiate light to the inside of the upper yarn catching tube 5 through the transparent member. When the yarn 12 is present inside the upper yarn catching tube 5, the light receiving part of the yarn detection sensor 53 can receive the light reflected by the yarn 12. When the yarn detecting sensor 53 is not provided, the yarn monitoring device 19 detects whether or not the yarn is captured by the upper yarn capturing tube 5 by temporarily lowering the suction nozzle 52. In this case, the yarn monitoring device 19 functions as a detection unit that detects whether or not the yarn is present in the yarn catching portion of the upper yarn catching tube 5.

According to the above configuration, the winding unit 10 can wind the yarn 12 around the winding bobbin 22 to form the package 20.

Next, the operation of the winder unit 10 until the winding is resumed after the yarn 12 that has been cut off is spliced when the yarn 12 is cut off between the yarn supplying section 1 and the winding section 2 will be described with reference to fig. 2 and 3.

In the winding unit 10, when the yarn 12 is cut, the yarn end on the package 20 side (the winding section 2 side) of the cut yarn 12 is wound around the package 20 which is rotated by inertia. The cause of the yarn 12 breakage may be, for example, the yarn monitor 19 detecting a yarn defect and automatically cutting the yarn 12 by the cutter 24, or the yarn 12 breakage due to an accidental large tension, but is not limited to these. In the following description, the yarn end on the package 20 side is sometimes referred to as an upper yarn end.

The unit control unit 50 transmits a drive signal to the second motor 62, rotates the upper yarn catching tube 5 upward so that the suction nozzle 52 approaches the package 20, and moves the upper yarn catching tube to an upper yarn catching position shown by a two-dot chain line in fig. 3. As a result, the suction nozzle 52 of the upper yarn catching tube 5 moves to a position substantially opposed to the surface of the package 20 with a predetermined interval.

When the suction nozzle 52 reaches the upper yarn catching position, the unit control portion 50 transmits a drive signal to the first motor 29 to rotate the package 20 in a direction opposite to the winding direction of the yarn, that is, in the yarn unwinding direction (reverse drive). The unit control unit 50 causes the upper yarn catching tube 5 to generate a suction airflow in the suction nozzle 52. Thus, the upper yarn end can be unwound from the package 20 by the suction action of the suction nozzle 52 and the reverse driving of the package 20. The upper yarn end existing on the surface of the package 20 is sucked into the upper yarn catching tube 5 by the suction airflow when passing through the portion facing the suction nozzle 52. On the other hand, when the upper yarn end is not unwound from the package 20 even in the capturing operation of sucking and capturing the upper yarn end by reversely driving the package 20 as described above, the reversely driving of the package 20 is temporarily stopped and then reversely driven again, and the capturing operation of the upper yarn capturing tube 5 is performed in the same manner as described above. When the upper yarn end is not unwound from the package 20 even if the reverse driving of the package 20 and the catching operation of the upper yarn catching tube 5 are performed a predetermined number of times, the unit control section 50 performs the catching operation of the upper yarn catching tube 5 while reciprocating and rotating the package 20 at least once. Details of the reciprocating rotational motion will be described later.

On the other hand, the yarn end on the yarn supplying bobbin 11 side (the yarn supplying portion 1 side) of the cut yarn 12 is caught by the suction airflow generated at the tip of the lower yarn catching tube 4. In the following description, the yarn end on the yarn supplying bobbin 11 side may be referred to as a lower yarn end.

After the upper yarn end and the lower yarn end are both caught, the unit control section 50 sends a drive signal to the second motor 62 to rotate the upper yarn catching tube 5 downward as indicated by the thick line arrow in fig. 3. The unit control unit 50 rotates the lower yarn catch pipe 4 upward as indicated by the thick line arrow. Thereby, the upper yarn end captured by the upper yarn capturing tube 5 and the lower yarn end captured by the lower yarn capturing tube 4 are guided to the yarn splicing device 3.

Then, the yarn joining device 3 performs yarn joining using the upper yarn end and the lower yarn end. When the yarn 12 is in a continuous state between the yarn supplying section 1 and the winding section 2, the unit control section 50 controls the first motor 29 to drive the package 20 in the forward direction, and starts winding the yarn 12 again.

Next, the operation of the winder unit 10 in the winding step will be described in detail with reference to fig. 4. Fig. 4 is a flowchart showing a process performed to form the package 20 in the winder unit 10.

When performing the winding step of winding the yarn 12 into the package 20, the unit control section 50 determines whether or not the yarn 12 is cut off in the yarn running path from the yarn supplying section 1 to the winding section 2 (step S101). In the present embodiment, the unit control portion 50 determines whether or not the yarn 12 is broken based on whether or not a signal indicating the presence of the yarn 12 is input from the yarn monitoring device 19. When the yarn monitor 19 detects a yarn defect and cuts the yarn 12 by the cutter 24, it determines whether or not the yarn 12 is broken based on the cutting signal.

When it is determined that the yarn 12 is not broken (no at step S101), the unit control section 50 drives the package 20 at a predetermined winding speed (the rotational speed of the package 20 when the yarn is wound) (step S108). That is, the yarn 12 is wound to form the package 20.

On the other hand, when it is determined that the yarn 12 is broken (yes in step S101), the unit control section 50 starts capturing the upper yarn end by the upper yarn capturing tube 5 (capturing step) (step S102).

Specifically describing the operation for catching, the unit control section 50 first controls the first motor 29 to immediately stop the rotation of the package 20. Further, the unit control section 50 starts the upward rotation of the upper yarn catch pipe 5. As a result, the suction nozzle 52 reaches the upper yarn catching position shown by the two-dot chain line in fig. 3. The unit control unit 50 opens the shutter member disposed on the path connecting the upper yarn catching pipe 5 and the blower duct at the time point when the upper yarn catching pipe 5 starts rotating upward. The suction nozzle 52 of the upper yarn catching tube 5 can apply a suction flow to the surface of the package 20 at an upper yarn catching position close to the surface of the package 20.

Further, the unit control section 50 sends a signal to the first motor 29 to start the reverse driving of the package 20. The unit control section 50 reversely drives the package 20 by a predetermined rotation amount in a state where the upper yarn catch pipe 5 is rotated to the upper side. By reversely driving the package 20 in a state where the suction nozzle 52 applies the suction flow to the surface of the package 20, it is possible to promote unwinding of the upper yarn and suction of the upper yarn end by the suction nozzle 52.

It is also considered that the upper yarn end is not captured by the upper yarn capturing tube 5 even if the package 20 is reversely driven by a predetermined rotation amount. In this case, the unit control section 50 temporarily stops the reverse driving of the package 20, and then performs the reverse driving of the package 20 again, and tries to catch the upper yarn end by the upper yarn catching tube 5. The unit control section 50 repeats trial operation of capturing the upper yarn end in association with the reverse driving of the package 20 until the number of trial operations reaches a predetermined upper limit value. The upper limit value can be determined as appropriate, and may be one or more times.

The unit control section 50 monitors the signal input from the yarn detection sensor 53 at an appropriate timing every time a trial of capturing the yarn end is performed. When the signal indicating that the yarn is present in the upper yarn catching tube 5 is input from the yarn detecting sensor 53, it is not necessary to try the catching of the upper yarn end again, and therefore the unit control section 50 immediately ends the processing of step S102 even in the middle.

After that, the unit control section 50 determines whether or not the upper yarn catching tube 5 successfully catches the upper yarn end (step S103). This determination can be made based on the yarn detection signal output from the yarn detection sensor 53.

When it is determined that the upper yarn end is successfully captured by the upper yarn capturing tube 5 (yes at step S103), the unit control section 50 causes the yarn splicing device 3 to splice yarns (step S104). Specifically, the unit control section 50 continues the reverse rotation of the package 20 and rotates the upper yarn catching tube 5 downward, thereby guiding the upper yarn end to the yarn splicing device 3. The unit control unit 50 rotates the lower yarn catching pipe 4 upward about the pipe shaft 41 to guide the lower yarn to the yarn splicing device 3. In this state, the upper yarn and the lower yarn are spliced by the yarn splicing device 3. At substantially the same time, the unit control portion 50 closes the shutter member disposed on the path connecting the yarn catching tube 5 and the blower duct, and stops the suction flow in the suction nozzle 52.

When it is determined that the catching of the upper yarn end by the upper yarn catching tube 5 has failed even through the predetermined number of trials (no at step S103), the unit control section 50 transmits a signal to the first motor 29 to end the reverse driving of the package 20 and start the forward and reverse reciprocating driving of the package 20 (step S105). Further, the cause of the catching failure is, for example, that the upper yarn end is firmly hooked on the surface portion of the package 20 due to the amount of hairiness of the yarn, but is not limited thereto.

The unit control section 50 first drives the package 20 positively. After rotating the package 20 by the predetermined first rotation amount, the unit control section 50 switches the rotation direction of the package 20 and reversely drives the package 20 by the predetermined second rotation amount.

Here, the unit control section 50 controls the rotation time, the rotation speed, and the like of the package 20 such that the second rotation amount (the rotation amount of the reverse driving of the package 20) is larger than the first rotation amount (the rotation amount of the forward driving of the package 20) in the forward and reverse reciprocating driving. The specific rotation time and rotation speed are not particularly limited as long as the rotation amount of the reverse drive is larger than the rotation amount of the forward drive.

As described above, in the present embodiment, the amount of rotation of the reverse drive is larger than the amount of rotation of the forward drive in one forward and reverse reciprocating drive. Therefore, the upper yarn oscillates with a larger stroke in the reverse rotation than in the normal rotation of the package 20, and the stimulus to the upper yarn changes in this sense. In addition, the suction flow of the suction nozzle 52 can be applied to the upper yarn from various positions within the range of forward and backward reciprocating driving, and the suction flow of the suction nozzle 52 can be applied to the upper yarn in an asymmetrical manner biased toward the reverse driving side (in other words, the side promoting unwinding of the upper yarn). As a result, the loosening effect based on the unique stimulus to the upper yarn can be obtained. Thus, even when the upper yarn is firmly hooked to the surface of the package 20, the hooking can be released with high probability, and the upper yarn end can be caught by the upper yarn catching tube 5.

Hereinafter, description will be given with reference to an example shown in fig. 5 (a). In fig. 5 (a), hairiness is generated in the middle of the upper yarn, and the hairiness is partially caught on the surface of the package 20. For convenience of explanation, the hairiness portion is shown in fig. 5 with a small quadrangle mark. In the state of fig. 5 (a), a part of the upper yarn on the leading end side of the hairiness portion attached to the surface of the package 20 is sucked by the suction nozzle 52 located at the upper yarn catching position. However, since the hook of the hairiness portion is strong, the hairiness portion cannot be peeled off from the surface of the package 20 even by the suction flow applied by the suction nozzle 52. In fig. 5 (a), the upper yarn is bent at the position of the hairiness portion located above the suction nozzle 52 as a boundary.

When the package 20 is positively driven from this state, the hairiness portion moves in a direction approaching the suction nozzle 52. In fig. 5 (b), a state where the positive driving is completed and the hair feather portion is substantially opposed to the suction nozzle 52 is shown. The bending produced by the upper yarn is straightened during the movement of the hairiness portion. By the above operation, a large number of portions of the upper yarn on the tip side of the position of the hairiness are sucked by the suction nozzle 52, and therefore the suction flow can pull the upper yarn with a stronger force.

When the package 20 is reversely driven from the state of fig. 5 (b), the hairiness portion moves in the direction away from the suction nozzle again. The upper yarn tries to bend again with the hairiness portion as a boundary, but since the suction nozzle 52 has sucked the upper yarn to the vicinity of the hairiness portion, the upper yarn is strongly pulled by the suction flow. Therefore, as the hairiness portion moves, a strong force acts on the hairiness portion via the upper yarn in a direction of separating from the surface of the package 20 (in other words, in a direction of unwinding the upper yarn). Further, since the reverse driving rotation amount is larger than the forward driving rotation amount of the package 20, the above-described strong peeling function is exerted on the hairiness portion in a range of a long movement stroke of the hairiness portion. As a result, as shown in fig. 5 (c), the hairiness portion can be peeled off from the package 20 and sucked to the upper yarn catch pipe 5 with high probability.

In the present embodiment, the first rotation amount is set to a rotation amount within one rotation of the package 20. That is, the rotation amount of the package 20 during forward driving in the forward and backward reciprocating driving is a value within 360 °. The second rotation amount may be within one rotation of the package 20 or may exceed one rotation of the package 20.

The unit control unit 50 controls the rotation speed of the package 20 in the forward and reverse reciprocating drive to be slower than the winding speed of the yarn 12 in the package 20. The rotational speed of the package 20 in the forward and reverse reciprocating driving may be the same or different between the forward driving and the reverse driving.

It is also considered that the upper yarn end is not caught by the upper yarn catching tube 5 even if the package 20 is driven to reciprocate forward and backward as described above. In this case, the unit control section 50 again reciprocates the package 20 forward and backward, and attempts to catch the upper yarn end by the upper yarn catching tube 5. The unit control section 50 repeats trial operation of capturing the upper yarn end accompanying the forward and backward reciprocating driving of the package 20 until the number of trial operations reaches a predetermined upper limit value. The upper limit value can be determined as appropriate.

Each time a trial of capturing the end of the yarn is performed, the unit control section 50 monitors the signal input from the yarn detection sensor 53 at an appropriate timing. When the signal indicating that the yarn is present in the upper yarn catching tube 5 is input from the yarn detecting sensor 53, it is not necessary to try the catching of the upper yarn end again, and therefore the unit control section 50 immediately ends the processing of step S105 even in the middle.

When the upper limit of the trial number of capturing the upper yarn end is two or more times and the yarn detecting sensor 53 does not detect the upper yarn end in the first forward and backward reciprocating drive, the package 20 performs the forward and backward reciprocating drive (reciprocating drive) two or more times.

As described above, in one forward and reverse reciprocating drive, the rotation amount of the reverse drive is larger than the rotation amount of the forward drive of the package 20. Therefore, every time the forward and reverse reciprocating driving is performed, the package 20 is consequently in a state of being reversely driven by a difference in the rotation amount in both directions. This means that the position of the upper yarn with respect to the suction nozzle 52 shifts to the reverse side every time the package 20 is repeatedly driven in the forward and reverse directions. Therefore, the upper yarn receives more various stimuli due to the suction flow of the suction nozzle 52, and the engagement of the upper yarn with the surface of the package 20 can be more effectively released. Even when the difference between the rotation amounts in the two directions in one forward and reverse reciprocating drive is small, the reverse drive is accumulated by repeating the forward and reverse reciprocating drive a plurality of times, and as a result, the package 20 is reversely driven by a large rotation amount (for example, by 10 rotations). In this way, the suction flow of the suction nozzle 52 can be applied to the entire package 20 by simply repeating the forward and backward reciprocating driving of the package 20 until the catching of the upper yarn is successful, and the loosening action for the upper yarn can be repeatedly obtained with variation. As a result, the firm engagement of the upper yarn, which had been required to be released by manual operation by the operator in the conventional structure, can be automatically released and caught, and therefore, significant labor saving can be achieved.

The upper limit value of the number of trials of catching the upper yarn end (in other words, the limit value regarding the number of forward and backward reciprocating drives) can be determined as appropriate, and can be set to 100 times, for example. The upper limit value is preferably determined such that the amount of reverse driving of the package 20 accumulated by the forward and reverse reciprocating driving is one week or more. Thus, the suction nozzle 52 can be made to act on the entire outer periphery of the package 20, and therefore the probability that the upper yarn end can be captured can be increased.

After that, the unit control section 50 determines whether or not the upper yarn catching tube 5 successfully catches the upper yarn end (step S106). The process is the same as the process of step S103. When it is determined that the upper yarn end is successfully captured by the upper yarn capturing tube 5 (yes at step S106), the unit control section 50 causes the yarn splicing device 3 to splice yarns (step S104).

When it is determined that the capturing of the upper yarn end by the upper yarn capturing pipe 5 still fails as a result of the predetermined number of trials (no at step S106), the unit control section 50 stops the operation after displaying an alarm on the display 82 of the machine station control device 80 (step S107). By interrupting the forward and reverse reciprocating drive and stopping it at a time point when the catching failure of the upper yarn occurs continuously to some extent, the useless rotation of the package 20 can be avoided and energy saving can be achieved. Further, by performing the alarm display on the display 82, the operator can be prompted to manually detach the upper yarn end strongly adhering to the surface of the package 20.

After the yarn joining is performed by the yarn joining device 3, the unit control section 50 transmits a drive signal to the first motor 29 to positively drive the package 20. Thereby, the yarn 12 is wound into the package 20 (step S108).

Thereafter, the unit control unit 50 ends the process when, for example, another abnormality occurs in the winder unit 10 that requires stopping the winding of the yarn 12, or when the stop of the winder unit 10 is instructed by the operator (step S109, yes). If this does not occur (no at step S109), the unit control unit 50 repeatedly executes the above-described steps S101 to S108.

Next, the operation of the winder unit 10 in the winding step will be described with reference to the timing chart shown in fig. 6. Fig. 6 is a timing chart showing an example of the rotation control of the package 20 in the winder unit 10.

When the yarn 12 is broken, the unit control section 50 controls the first motor 29 to immediately stop the rotation of the package 20.

Thereafter, at a timing of time t0 in fig. 6, the unit control portion 50 rotates the upper yarn catching pipe 5 upward. As a result, at the timing t1, the suction nozzle 52 reaches the upper yarn catching position.

At the timing of the time t1, the unit control unit 50 sends a signal to the first motor 29 to start the reverse driving of the package 20. The reverse driving of the package 20 is performed from the time t1 until a predetermined time elapses. Fig. 6 shows a case where trials of catching the upper yarn end accompanying the reverse driving of the package 20 are performed at times t1, t2, and t3, respectively, and the catching of the yarn fails.

In the example of fig. 6, the upper limit number of trials is set to three times for catching the upper yarn end accompanying the reverse driving of the package 20. Since the upper limit number of trials has been reached, the unit control section 50 sends a signal to the first motor 29 at the timing of time t4 to start the forward and reverse reciprocating driving of the package 20. The forward and reverse reciprocating driving of the package 20 is repeated as indicated by times t4, t5, t6, and … … until the catching of the upper yarn end is successful.

The unit control unit 50 monitors whether or not the yarn catching is successful from the time point of time t 4. In the example of fig. 6, the case where the forward and reverse reciprocating driving of the package 20 is repeated 40 times or more, and it is determined that the catching of the upper yarn end is successful for the first time at the timing of time t50 is shown. The unit control unit 50 sends a signal to the first motor 29 to stop the package 20 after continuing the reverse rotation of the package 20 to an appropriate timing after the time t 50. Further, at the timing of time t50, the unit control portion 50 rotates the upper yarn catching tube 5 downward. As a result, at time t51, the suction nozzle 52 reaches the yarn splicing position. Then, the yarn joining device 3 performs yarn joining.

At time t52, which is the timing at which the yarn joining ends, the unit control section 50 transmits a signal to the first motor 29 to start the forward driving of the package 20. Thereby, the yarn is wound.

The speed of the forward and reverse reciprocating driving of the package 20 may be constant from the first to the last of the reciprocating repetitive driving, or may be changed in the middle. For example, after time t7 at which trial run of yarn catching accompanying the forward and reverse reciprocating driving of the package 20 has failed three times in succession, the unit control section 50 may perform the forward and reverse reciprocating driving again so as to drive the package 20 forward and reverse at a rotational speed slower than the rotational speed of the package 20 at the time of the first forward and reverse reciprocating driving (from time t4 to time t 7). As a result, the speed of the forward and reverse reciprocating drive of the package 20 decreases stepwise. At the time point when the catching of the upper yarn fails, it is suspected that the upper yarn is firmly hooked on the surface of the package 20, and then the rotational speed of the forward and reverse reciprocating driving is decreased, whereby the action of the suction flow of the suction nozzle 52 on the upper yarn can be enhanced, and the probability of the catching success of the upper yarn can be increased.

In the present embodiment, when the forward and reverse reciprocation driving of the package 20 is performed in this manner, the unit control section 50 notifies that the forward and reverse reciprocation driving of the package 20 is being performed, using the display 82 of the machine station control device 80. This notification can be realized by, for example, displaying an appropriate message on the display 82, but is not limited thereto. The operator can notice the change of the condition (the yarn breakage and the response thereof) early on according to the display content of the display 82.

As described above, the automatic winder 100 according to the present embodiment includes the winding unit 2, the first motor 29, the upper yarn catch bobbin 5, and the unit control unit 50. The winding section 2 winds the yarn 12 to form a package 20. The first motor 29 rotationally drives the package 20, and can switch the rotational direction of the package 20 between a forward rotational direction in which the package rotates in the yarn winding direction and a reverse rotational direction in which the package rotates in the reverse direction to the yarn winding direction. When the yarn 12 wound by the winding section 2 is broken, the upper yarn catching tube 5 catches the end of the yarn from the package 20 by suction. The unit control section 50 controls the first motor 29. When the suction of the upper yarn end is started by the upper yarn catching tube 5, the unit control section 50 performs forward and reverse reciprocating driving of the package 20 from the forward driving of rotating the package 20 in the winding direction of the yarn 12 and reverse driving of rotating the package 20 by a rotation amount larger than that of the forward driving in the reverse direction of the winding direction of the yarn 12 until the catching of the yarn end by the upper yarn is successful.

Thus, by driving the package 20 forward and backward, a good stimulus can be given to the upper yarn based on the catching action of the upper yarn catching tube 5. Further, since the package 20 is reversely driven by a rotation amount larger than the rotation amount of the forward driving in the forward and reverse reciprocating driving, it is expected that the upper yarn is asymmetrically stimulated by the upper yarn catching tube 5 and the unwinding of the upper yarn is promoted. Therefore, even if the upper yarn is firmly hooked on the surface of the package 20, the hooking can be easily released and the upper yarn can be efficiently caught.

In the winder unit 10 according to the present embodiment, the unit control section 50 performs reciprocating repetitive driving in which the forward and reverse reciprocating driving is repeated a plurality of times on the package 20 as needed.

This can secure a plurality of opportunities to release the yarn from the hook, and therefore, the upper yarn can be easily caught. Further, since the package 20 is reversely driven in stages every time the forward and reverse reciprocating driving is completed, more various stimuli can be given to the upper yarn by the upper yarn catching tube 5 (the suction nozzle 52), and the upper yarn catching tube 5 can be made to act on a large area of the outer periphery of the package 20.

In the winder unit 10 according to the present embodiment, the unit control section 50 can perform the forward and reverse reciprocating drive of the package 20 two or more times until the package 20 is reversely driven at least one turn from the start time point of the first forward and reverse reciprocating drive by the accumulation of the forward and reverse reciprocating drives.

Thus, the upper yarn catching tube 5 can be caused to act on the entire outer periphery of the package 20 by the reciprocating repetitive driving.

In the automatic winder 100 according to the present embodiment, the unit control unit 50 may be configured to: after the package 20 is repeatedly driven to reciprocate at least once, if the upper yarn catching tube 5 fails to catch the upper yarn, the rotational speed of the forward and reverse drives of the package 20 is reduced and the forward and reverse reciprocating drives are performed again.

In this case, the rotation speed of the forward and reverse reciprocating drive in the reciprocating repetitive drive is automatically reduced in a situation where it is expected that the catching of the upper yarn is difficult, and therefore the probability that the upper yarn can be caught thereafter can be improved.

In the automatic winder 100 according to the present embodiment, the unit control unit 50 may be configured to: in the reciprocating repetitive driving, after the package 20 is driven to reciprocate forward and backward at least once, when the upper yarn catching tube 5 fails to catch the upper yarn, the rotational speed of the forward driving and the backward driving of the package 20 is reduced and the forward and backward reciprocating driving is performed again.

In this case, since the rotation speed of the forward and backward reciprocating drive is automatically reduced in a situation where it is expected that the catching of the upper yarn is difficult, the probability that the upper yarn can be caught thereafter can be increased.

In the automatic winder 100 according to the present embodiment, when the unit control section 50 repeatedly drives the package 20 in a reciprocating manner (step S105), the rotational speed of the forward drive and the reverse drive of the package 20 is slower than the rotational speed of the package 20 when the yarn 12 is wound and the package 20 is formed (step S108).

This enables the upper yarn catching tube 5 to effectively act on the package 20 for catching the upper yarn.

In the automatic winder 100 according to the present embodiment, the rotation amount of the package 20 in the forward driving included in one forward and reverse reciprocating driving of the reciprocating repetitive driving is within one rotation amount.

Accordingly, the amount of rotation of the forward and reverse reciprocating driving of the package 20 is relatively small, and thus vibration and the like generated from the automatic winder 100 can be reduced.

The automatic winder 100 according to the present embodiment further includes a yarn detection sensor 53 that detects whether or not a yarn is present in the upper yarn catching pipe 5. The unit control unit 50 causes the yarn detection sensor 53 to perform a detection operation of whether or not the yarn is present in the upper yarn catch duct 5 on the upper yarn catch duct 5 in parallel with the execution of the reciprocating repetitive driving, and terminates the reciprocating repetitive driving when it is determined that the yarn is successfully caught by the upper yarn catch duct 5 based on the detection result of the yarn detection sensor 53. Even when it is determined that the yarn is not successfully captured by the upper yarn capturing tube 5 based on the detection result of the yarn detection sensor 53, the unit control section 50 determines that the yarn is not successfully captured by the upper yarn capturing tube 5 and ends the reciprocating repetitive driving when the number of times of the forward and reverse reciprocating driving is performed reaches a preset limit value.

This enables the upper yarn catching tube 5 to successfully catch the upper yarn and then smoothly start the next operation. Further, when the possibility that the upper yarn catching tube 5 catches the upper yarn is low, the package 20 can be prevented from being unnecessarily driven forward and backward.

The automatic winder 100 according to the present embodiment includes a display 82. When the reciprocating repetitive driving is completed because the number of times of the forward and reverse reciprocating driving has reached the limit value, the display 82 gives an alarm.

This makes it possible to promptly notify the operator or the like that the reciprocating repetitive driving is finished because the upper yarn catching tube 5 has a low possibility of successfully catching the yarn in the future.

The automatic winder 100 according to the present embodiment includes a display 82. The display 82 notifies that the reciprocating driving of the package 20 is being performed.

This makes it possible for the surrounding operator or the like to easily recognize that the package 20 is repeatedly driven in the reciprocating manner to catch the yarn.

The yarn catching method using the automatic winder 100 (winder unit 10) according to the present embodiment includes a winding step and a catching step. The winding step winds the yarn 12 to form a package 20. The catching step is a step of catching the yarn 12 by drawing the yarn from the package 20 for yarn joining when the yarn is broken in the middle of the winding step. In the catching step, the forward and reverse reciprocating driving of the package 20, that is, the forward and reverse reciprocating driving including the forward driving of rotating the package 20 in the winding direction of the yarn 12 and the reverse driving of rotating the package 20 in the reverse direction of the winding direction of the yarn 12 by a rotation amount larger than the rotation amount of the forward driving, is performed a plurality of times.

Thus, even if the upper yarn is firmly hooked to the surface of the package 20, the hooking can be easily released and the upper yarn can be efficiently caught.

Next, an automatic winder 100 according to a second embodiment will be described with reference to fig. 7. Fig. 7 is a front view and a block diagram showing a schematic configuration of the winder unit 10 of the automatic winder 100 according to the second embodiment. In the description of the second embodiment, the same or similar components as those of the previous embodiments are denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

The automatic winder 100 of the present embodiment differs in that each of the plurality of winder units 10 includes a winding section 2x having the configuration of the traverse device 123, and does not include a winding section 2 having the configuration of the winding drum 23 having the traverse groove 27. That is, the winding section 2x includes a cradle 121 configured to be able to mount the winding bobbin 22, a contact roller 122, and a traverse device 123.

The cradle 121 detachably holds the winding bobbin 22 (package 20). The cradle 121 is configured to be rotatable (rotated) toward the front side and the back side of the winder unit 10. The increase in the yarn layer diameter of the package 20 accompanying the winding of the yarn 12 onto the winding bobbin 22 can be absorbed by the rotation of the cradle 121. That is, even if the yarn layer diameter of the package 20 changes by winding the yarn 12, the surface of the package 20 can be brought into proper contact with the contact roller 122.

The cradle 121 is provided with a package driving motor (driving unit) 125 constituted by a servo motor, for example. The winding section 2x winds the yarn 12 around the surface of the winding bobbin 22 (or the surface of the package 20) by rotationally driving the winding bobbin 22 by the package driving motor 125.

The rotation shaft of the package drive motor 125 is connected to the winding bobbin 22 so as not to rotate relative to the winding bobbin 22 when the winding bobbin 22 is supported by the cradle 121 (so-called direct drive method). The package driving motor 125 is electrically connected to the unit control section 50. The unit control section 50 can control the package driving motor 125 to start/stop the rotation of the package driving motor 125 and change the rotation direction and the rotation speed.

The contact roller 122 is rotatably provided and configured to be able to contact the surface of the winding bobbin 22 or the surface of the package 20 from below. The contact roller 122 is capable of supporting at least a portion of the weight of the winding bobbin 22 or package 20.

The traverse device 123 includes a traverse arm 131 and a traverse drive motor 132. The traverse arm 131 is provided rotatably and can hold the yarn 12 at its leading end. The traverse driving motor 132 drives the traverse arm 131. The traverse driving motor 132 is electrically connected to the unit control section 50. The unit control section 50 is configured to reciprocate and rotate the traverse driving motor 132 in conjunction with the package driving motor 125, thereby traversing the yarn 12 wound into the package 20 at a predetermined twill angle.

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

In the above embodiment, the reverse driving of the package 20 is performed after the yarn 12 is cut and before the package 20 is reciprocated, but such reverse driving of the package 20 may be omitted. That is, the package 20 may be reciprocated immediately after the yarn 12 is cut.

In the reciprocation of the package 20, whether the forward driving or the reverse driving is performed first can be arbitrarily selected.

The trial of catching the upper yarn end by the upper yarn catching tube 5 may be performed once or a plurality of times while rotating the package 20 in an appropriate direction by an appropriate rotation amount between the reverse driving of the package 20 shown at times t1 to t4 in fig. 6 and the repetitive reciprocating driving of the package 20 shown at times t4 and thereafter. For example, the forward drive and the reverse drive of the package 20 shown in japanese patent No. 4277227 may be performed before the time t 4. When the upper yarn catching tube 5 is caused to act on the surface of the package 20, a state may occur in which not the upper yarn end but only a middle part of the upper yarn that is slack is sucked by the suction nozzle 52. By rotating the package 20 disclosed in japanese patent No. 4277227, that state can be released. When the catching of the upper yarn end is attempted by the reciprocating repetitive driving at time t4 and thereafter in fig. 6, it takes a long time until the catching of the upper yarn end is successful, and the operation efficiency of the winder unit 10 may be lowered. Therefore, it is advantageous to rotate the package 20 variously and try to catch the upper yarn end before the reciprocating repeated driving transfer to the package 20.

The limitation of the reciprocation driving of the package 20 may be determined based on the elapsed period after the start of the reciprocation driving, instead of the number of times of the reciprocation.

The state of the package 20 undergoing the reciprocating motion may be notified by a lamp provided separately to the machine controller 80, for example, instead of the display 82. The notification may be performed by operating a lamp, a buzzer, or the like provided in each winder unit 10. The alarm described in step S107 of fig. 4 can be realized by an appropriate method other than the display 82 in the same manner.

In the second embodiment, the following configuration may be adopted: the winding section 2x is provided with a lifting mechanism capable of rotating the cradle 21 and separating the package 20 from the contact roller 122, and the unit control section 50 reciprocates the package 20 in a state where the lifting mechanism lifts the package 20 so as to separate the package 20 from the contact roller 122.

In the above-described embodiment, the configuration in which the upper limit value of the number of trials of capturing the upper yarn end (the limit value regarding the number of times of reciprocating motion) is set to, for example, 100 times has been described, but the present invention is not limited to this. For example, the upper limit of the number of trials for catching the upper yarn end may be set to 50 times, and the two sets may be repeated. By grouping, successive trials of the catching of the upper yarn ends are temporarily interrupted, so that a different reciprocating stimulus can be provided in the second group than in the first group. This can be expected to improve the success rate of yarn catching.

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