CN112660914B

CN112660914B - Yarn winding device and yarn catching method

Info

Publication number: CN112660914B
Application number: CN202011047927.2A
Authority: CN
Inventors: 寺尾雄帆; 村山贤一; 山本厚志; 上山翔太
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2019-10-16
Filing date: 2020-09-29
Publication date: 2024-07-09
Anticipated expiration: 2040-09-29
Also published as: JP2021062967A; CN112660914A; EP3808690A1

Abstract

The invention provides a yarn winding device and a yarn catching method. The upper yarn catching tube of the automatic winder catches the yarn from the package by suction when the yarn wound by the winding portion breaks. The unit control section controls the package driving motor. The unit control unit causes the driving unit to perform forward and reverse reciprocating driving when the upper yarn catch tube starts suction of the upper yarn, wherein the forward and reverse reciprocating driving starts forward driving or reverse driving for rotating the package in the winding direction of the yarn and reverse driving for rotating the package in the reverse direction of the winding direction by a rotation amount larger than the rotation amount of the forward rotation.

Description

Yarn winding device and yarn catching method

Technical Field

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

Background

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

In the automatic winder of japanese patent No. 4277227, a winding unit unwinds a spun yarn from a yarn feeding bobbin and rewinds a predetermined amount of the yarn onto a winding package to form a winding package. At this time, if the yarn supplied from the yarn supplying bobbin is split, the winding unit sucks and captures the yarn on the winding package side through the suction nozzle, guides the yarn to the yarn splicing device, and splices the yarn by the yarn splicing device. Here, the suction nozzle attracts the yarn on the package side to draw the yarn end out of the package (so-called yarn-finding).

When the suction catch of the yarn on the winding package side is performed by the suction nozzle, the winding package is rotated in the forward direction (winding direction) by a predetermined number of rotations (or a predetermined time), and then the winding package is rotated in the opposite direction to the forward direction. The relationship between the amount of rotation that rotates the winding package in the forward direction in a state in which the suction nozzle is close to the winding package and the amount of rotation that rotates the winding package in the reverse direction in the same state is not specifically mentioned in japanese patent No. 4277227.

Disclosure of Invention

Regarding 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 during rewinding of the yarn, the suction nozzle can perform suction capturing from the end portion of the yarn instead of the intermediate portion if the winding package is rotated in the forward direction and then rotated in the reverse direction in a state where the suction nozzle is close to the winding package. However, for example, in a state where the yarn of the wound package is firmly caught by the surface portion of the package due to the excessive hairiness of the yarn, even if the wound package is rotated only in the forward direction and the reverse direction and the suction effect is applied to the end portion of the yarn as described above, the catching of the yarn of the wound package may not be released, and thus the yarn may not be caught. In this case, since an unwinding operation for unwinding the yarn on the winding package side needs to be performed by the hand of the operator, the labor of the operator increases. Further, the formation of the wound package by the winding unit has to be stopped until the operator performs the unwinding operation, and thus 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 yarn from a package.

The problems to be solved by the present invention are as described above, and the means for solving the problems and the effects thereof will be described below.

According to a first aspect of the present invention, there is provided a yarn winding device having the following structure. That is, the yarn winding device includes a winding unit, a driving unit, a yarn catching unit, and a control unit. The winding unit winds the yarn to form a package. The driving unit rotationally drives the package, and can switch the rotational direction of the package to a normal rotational direction in which the yarn is wound and a reverse rotational direction in which the yarn is wound. The yarn catching unit catches the yarn from the package by suction when the yarn wound by the winding unit breaks. The control unit controls the driving unit. The control unit causes the driving unit to perform forward and reverse driving including forward driving for rotating the package in a forward rotation direction, which is a winding direction of the yarn, by a first angle and reverse driving for rotating the package in a reverse rotation direction by a second angle larger than a rotation angle of the forward driving when the yarn catch unit starts suction of the yarn on the package side.

Thus, by driving the package in forward and reverse directions, the yarn on the package side can be stimulated well by the catching action of the yarn catch portion or the like. Further, since the package is reversely driven by a rotation amount larger than that of the forward drive in the forward and reverse reciprocating drive, it is expected that the yarn catch portion or the like applies an asymmetric stimulus to the yarn on the package side and promotes unwinding of the yarn. Therefore, even if the yarn is firmly caught on the surface of the package, the yarn on the package side can be efficiently caught by easily releasing the catch.

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

This ensures a plurality of opportunities to release the yarn hooking, and thus 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 driving is completed, the yarn on the package side can be supplied with more various stimuli by the yarn catching portion, and the yarn catching portion can be made to act on a large area of the package periphery.

In the yarn winding device, preferably, the control unit may cause the driving unit to repeatedly drive the yarn until the package is reversely rotated at least one turn from a start time point of the forward and reverse reciprocating driving by repeating the forward and reverse reciprocating driving.

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

In the yarn winding device, the control unit may slow down the forward and reverse driving of the package and perform the reciprocating repetitive driving again when the yarn catch unit fails to catch the yarn after performing the reciprocating repetitive driving at least once on the package.

In this way, the rotational speed of the forward and reverse reciprocating drive in the reciprocating repetitive drive is automatically reduced in a situation where the yarn is expected to be difficult to catch, and therefore, the probability of being able to catch the yarn later can be improved.

In the yarn winding device, it is preferable that the control unit slows down the speed of forward and reverse driving of the package and again performs the forward and reverse driving when the yarn catch unit fails to catch the yarn after performing the forward and reverse driving of the package at least once in the forward and reverse driving.

In this way, the rotational speed of the forward and reverse reciprocating drive is automatically reduced in a situation where yarn catching is expected to be difficult, and therefore, the probability of yarn catching after that can be improved.

In the yarn winding device, it is preferable that the rotational speed of the drive unit for driving the package in the forward direction and the reverse direction is lower than the rotational speed of the package when the yarn is wound to form the package when the drive unit is driven repeatedly in the reciprocating direction by the control unit.

Thus, the yarn catch portion can be effectively applied to the package for catching the yarn on the package side.

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

Accordingly, the rotation angle of the forward and reverse 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 is preferably configured as follows. That is, the yarn winding device includes a detecting section for detecting whether or not the yarn is present in the yarn catching section. 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 driving, and ends the reciprocating repetitive driving when it is determined that the yarn catching unit is successful in catching 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 reciprocating driving when the number of times of execution of the reciprocating driving or the elapsed time from the start time point of the reciprocating driving reaches a predetermined limit value even when the yarn capturing unit does not successfully capture the yarn based on the detection result of the detection unit.

This makes it possible to smoothly start the subsequent operation after the yarn catch portion successfully catches the yarn on the package side. In addition, when the possibility of successful yarn catching by the yarn catching section is low, wasteful forward and backward reciprocating driving of the package can be prevented.

The yarn winding device is preferably configured as follows. That is, the yarn winding device includes an alarm unit. The alarm unit generates an alarm when the number of times of execution of the forward and reverse reciprocating drive or an elapsed time period from a start time point of the reciprocating repetitive drive reaches the limit value and the reciprocating repetitive drive is ended.

This makes it possible to promptly notify an operator or the like that the yarn catching section is unlikely to catch the yarn successfully in the future, and thus the reciprocating repetitive driving is completed.

Preferably, the yarn winding device includes a notification unit that notifies that the package is being repeatedly driven to and fro.

Thus, the surrounding operator can easily grasp that the yarn on the package side is being repeatedly driven in a reciprocating manner.

Preferably, the winding unit includes a winding drum having a spiral traverse groove formed in an outer peripheral surface thereof which is in contact with an outer periphery of the package to rotate the package, and the driving unit drives the winding drum to rotate the package.

Since the package is rotated by the winding drum having the spiral traverse grooves formed in the outer peripheral surface, the rotation and traverse of the package are not shifted even when the driving unit is reciprocally driven.

According to a second aspect of the present invention, the following yarn capturing method is provided. That is, the yarn catching method includes a winding process and a catching process. The winding step winds the yarn to form a package. The catching step catches and draws out the yarn from the package for yarn splicing when the yarn breaks in the middle of the winding step. In the capturing step, the forward and reverse reciprocating drive is performed a plurality of times, and the forward and reverse reciprocating drive is configured by a forward drive for rotating the package in the winding direction of the yarn and a reverse drive for rotating the package in a reverse direction of the winding direction by a rotation amount larger than the rotation amount of the forward drive.

Thus, by driving the package in forward and reverse directions, the yarn on the package side can be stimulated favorably by the yarn catching portion or the like. Further, since the package is reversely driven by a rotation amount larger than that of the forward drive in the forward and reverse reciprocating drive, it is expected that the yarn catch portion or the like applies an asymmetric stimulus to the yarn on the package side and promotes unwinding of the yarn. In addition, the possibility of releasing the yarn hook can be ensured a plurality of times by the forward and reverse reciprocating driving. Therefore, even if the yarn is firmly caught on the surface of the package, the yarn on the package side can be efficiently caught by easily releasing the catch.

Drawings

Fig. 1 is a schematic front view showing the overall structure 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 a winding unit.

Fig. 3 is a side view showing a state in which the yarn end on the package side is guided to the yarn joining device in the case where the yarn is broken in the winding unit.

Fig. 4 is a flowchart showing a process performed to form a package in the winding 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 rotation control of the package in the winding 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, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic front view showing the overall structure 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 box 70, a machine control device 80, and a doffing device 90.

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

The machine control device 80 includes an operation key (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 makes it possible to collectively manage the plurality of winder units 10. The machine control device 80 controls the operation of the doffing device 90. The display 82 can display the winding condition of the yarn 12 of each winding unit 10, the content of the abnormality generated, and the like.

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

Next, the structure of the winding 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 winding unit 10. Fig. 3 is a side view showing a state in which the yarn end is guided to the yarn joining device 3 in the case where the yarn 12 is broken in the winding unit 10.

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

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

The yarn feeding section 1 can support the yarn feeding bobbin 11 placed on a conveying tray, not shown, at a predetermined position, and unwind the yarn 12 from the yarn feeding bobbin 11. The yarn feeding section 1 can discharge the empty yarn feeding bobbin 11 when all the yarns 12 are unwound from the yarn feeding bobbin 11, and receive a new yarn feeding bobbin 11 from a yarn feeding bobbin supply device, not shown. The yarn feeding unit 1 is not limited to the above-described type of conveying tray, and may be, for example, a magazine type yarn feeding unit that supports a yarn feeding bobbin fed from a magazine at a predetermined position and feeds the yarn 12 by unwinding the yarn.

The winding part 2 is provided at an upper portion of the winding unit main body 40. The winding unit 2 includes: cradle 21 configured to hold 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 drum 23, and when the winding drum 23 is rotated by the first motor 29, the yarn 12 unwound from the yarn feeding bobbin 11 in the yarn feeding section 1 is wound around the winding bobbin 22 while traversing at a constant amplitude by the traverse groove 27. Thereby, the package 20 having a constant winding width and a predetermined length (or a predetermined weight) can be formed. 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 winding 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 portion) 5 are disposed in a yarn traveling path between the yarn feeding portion 1 and the winding portion 2.

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

By bringing the restriction member 13a into contact with the balloon, tension is applied to the yarn 12 in the balloon portion, thereby preventing excessive swing of the yarn 12. This allows the yarn 12 to be properly unwound from the yarn feeding 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 portal 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 while being bent between the teeth of the engaged state, a proper 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 portal structure, and for example, a disk structure can be employed.

The lower yarn catch tube 4 can attract and catch the yarn 12 (yarn end) on the yarn feeding bobbin 11 side when the yarn 12 breaks between the yarn feeding portion 1 and the winding portion 2 for some reason (yarn breakage, yarn cutting, etc.), and then guide the yarn 12 to the yarn splicing device 3.

Specifically, the lower yarn catching tube 4 is 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 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 yarn feeding portion 1 side of the yarn 12, at a position indicated by a two-dot chain line in fig. 3, and thereafter, the lower yarn catching tube 4 is rotated upward about 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 feeding portion 1 side and the yarn 12 (yarn end) on the winding portion 2 side when the yarn 12 is broken as described above. In the present embodiment, the yarn joining device 3 is configured as a twisting device that uses a swirling air flow generated by compressed air to twist yarn ends with each other. However, the yarn splicing device 3 is not limited to the above-described splicing device, and a disk type splicer, a mechanical yarn knotting device, a knotter, or the like can be used.

The yarn monitoring device 19 monitors the thickness of the advancing yarn 12 by an appropriate sensor to detect yarn defects. The yarn monitoring device 19 also detects the presence or absence of the yarn 12 in the yarn running path, which is a broken yarn. A cutter 24 for cutting the yarn 12 immediately when the yarn monitoring device 19 detects a yarn defect is provided in the vicinity of the yarn monitoring device 19.

The upper yarn catching tube 5 can attract and catch the yarn 12 (yarn end) on the winding portion 2 side when the yarn 12 breaks as described above, and guide the caught yarn 12 to the yarn joining device 3.

Specifically, the upper yarn catching tube 5 is 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 is connected to the upper yarn catching pipe 5, and suction flow can be applied to the suction nozzle 52.

The suction nozzle 52 is formed elongated in such a manner as to include the winding width of the package 20. This makes it possible to apply the suction flow to 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 tube 5 and the blower duct. The shutter member is controlled to be opened and closed by a unit control section 50. By opening and closing the shutter member, the generation and stop of the suction flow in the suction nozzle 52 can be switched.

An output shaft of the second motor 62 is connected to the upper yarn catching tube 5. The second motor 62 is electrically connected to the unit control section 50. The unit control portion 50 can control the second motor 62 to start/stop the 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 upper yarn, which is the yarn on the winding portion 2 side of the yarn 12, at the upper yarn catching position indicated by the two-dot chain line in fig. 3. After that, the upper yarn catching tube 5 is rotated about the shaft 51 to the yarn joining position shown by the solid line in fig. 3, and thereby the upper yarn is guided to the yarn joining device 3.

The winding unit 10 is provided with a yarn detection sensor (detection unit) 53. The yarn detecting sensor 53 detects whether the upper yarn catching tube 5 catches the yarn. Specifically, the yarn detecting sensor 53 detects whether or not a yarn (yarn end) is present in the upper yarn catching tube 5. The yarn detecting sensor 53 is electrically connected to the unit control portion 50. The yarn detection sensor 53 can be configured as an optical sensor, for example. The yarn detection sensor 53 is disposed near the winding portion 2. The yarn detection sensor 53 is configured as a known optical sensor, and includes a light projecting section and a light receiving section, which are not shown. A part of the upper yarn catching tube 5 is made of a transparent member that transmits light. When the upper yarn catching tube 5 is located at the upper yarn catching position, the light projecting portion of the yarn detecting sensor 53 can radiate light to the inside of the upper yarn catching tube 5 via the transparent member. When the yarn 12 is present in the upper yarn catch tube 5, the light receiving portion of the yarn detecting sensor 53 can receive the light reflected by the yarn 12. When the yarn detecting sensor 53 is not provided, the suction nozzle 52 is once lowered, and the yarn monitoring device 19 detects whether the upper yarn catching tube 5 catches the yarn. In this case, the yarn monitoring device 19 functions as a detecting unit that detects whether or not yarn is present in the yarn catching portion of the upper yarn catching tube 5.

With 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 winding unit 10 until the broken yarn 12 is spliced and winding is restarted when the yarn 12 is broken between the yarn feeding unit 1 and the winding unit 2 will be described with reference to fig. 2 and 3.

In the winding unit 10, when the yarn 12 is broken, the yarn end on the package 20 side (winding portion 2 side) of the broken yarn 12 is wound on the inertial rotation package 20. The cause of the yarn 12 breakage includes, but is not limited to, automatic yarn 12 breakage by the cutter 24 due to detection of a yarn defect by the yarn monitoring device 19, or yarn 12 breakage due to a large tension caused by accident. In the following description, the yarn end on the package 20 side is sometimes referred to as an upper yarn end.

The unit control portion 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 tube to the upper yarn catching position shown by the two-dot chain line in fig. 3. As a result, the suction nozzle 52 of the upper yarn capturing tube 5 is moved to a position substantially opposed to the surface of the package 20 with a predetermined gap therebetween.

When the suction nozzle 52 reaches the upper yarn catching position, the unit control section 50 transmits a drive signal to the first motor 29 to rotate (back-drive) the package 20 in a direction opposite to the yarn winding direction, that is, in the yarn unwinding direction. The unit control section 50 causes the upper yarn catching tube 5 to generate a suction airflow at the suction nozzle 52. Thereby, the upper yarn end can be unwound from the package 20 by the suction action of the suction nozzle 52 and the back driving of the package 20. The upper yarn end present on the surface of the package 20 is sucked into the upper yarn catching tube 5 by the suction air flow when passing through the portion opposite to the suction nozzle 52. On the other hand, even when the capturing operation for sucking and capturing the upper yarn end by the back-driving of the package 20 is not performed, the back-driving of the package 20 is temporarily stopped and then back-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 package 20 is driven back and the upper yarn catching tube 5 is caught a predetermined number of times, the unit control portion 50 reciprocates the package 20 at least once, and similarly performs the catching operation of the upper yarn catching tube 5. Details of this reciprocating rotational motion will be described later.

On the other hand, the yarn end on the yarn feeding bobbin 11 side (yarn feeding section 1 side) of the broken yarn 12 is caught by the suction air flow generated at the front end of the lower yarn catching tube 4. In the following description, the yarn end on the yarn feeding bobbin 11 side is sometimes referred to as a lower yarn end.

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

After that, 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 feeding portion 1 and the winding portion 2, the unit control portion 50 controls the first motor 29 to drive the package 20 forward, and starts winding of the yarn 12 again.

Next, the operation of the winding 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 winding unit 10.

When the winding process of winding the yarn 12 around the package 20 is performed, the unit control section 50 determines whether or not the yarn 12 is disconnected in the yarn travel path from the yarn feeding 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 monitoring device 19 detects a yarn defect and cuts the yarn 12 with the cutter 24, it is determined whether or not the yarn 12 is broken based on the cutting signal.

When it is determined that the yarn 12 is not broken (step S101, no), the unit control section 50 causes the package 20 to be driven positively at a predetermined winding speed (rotational speed of the package 20 when the yarn is wound) (step S108). That is, winding of the yarn 12 is performed 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 portion 50 starts capturing the upper yarn end by the upper yarn capturing tube 5 (capturing step) (step S102).

When describing the capturing operation specifically, the unit control section 50 first controls the first motor 29 to stop the rotation of the package 20 immediately. The unit control unit 50 starts the upward rotation of the upper yarn catching tube 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 a point in time when the upper yarn catching pipe 5 starts to rotate upward. The suction nozzle 52 of the upper yarn catching tube 5 can apply suction flow to the surface of the package 20 at an upper yarn catching position near the surface of the package 20.

The unit control unit 50 transmits a signal to the first motor 29 to start the back-driving of the package 20. The unit control section 50 drives the package 20 reversely by a predetermined rotation amount in a state where the upper yarn catching tube 5 is rotated to the upper side. By driving the package 20 in reverse with the suction nozzle 52 applying the suction flow to the surface of the package 20, unwinding of the upper yarn and suction of the upper yarn end by the suction nozzle 52 can be promoted.

It is also conceivable that the upper yarn end is not caught by the upper yarn catching tube 5 even if the package 20 is back-driven by a predetermined rotation amount. In this case, the unit control portion 50 once stops the back-driving of the package 20, then back-drives the package 20 again, and tries to catch the upper yarn end by the upper yarn catch tube 5. The unit controller 50 repeats the trial of capturing the upper yarn end with the back driving of the package 20 until the number of trials reaches a predetermined upper limit value. The upper limit value can be appropriately determined, and may be one time or a plurality of times.

The unit control unit 50 monitors the signal input from the yarn detecting sensor 53 at an appropriate timing every time the previous trial of capturing the yarn end is performed. When a signal indicating the presence of yarn in the upper yarn catching tube 5 is input from the yarn detecting sensor 53, the capturing of the upper yarn end is not required to be attempted, and therefore, even halfway, the unit control section 50 immediately ends the process of step S102.

Thereafter, the unit control portion 50 determines whether or not the capturing of the upper yarn end by the upper yarn capturing tube 5 is successful (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 caught by the upper yarn catching tube 5 (yes in step S103), the unit controller 50 causes the yarn joining device 3 to join yarns (step S104). Specifically, the unit control portion 50 rotates the upper yarn catching tube 5 downward while continuing the reverse rotation of the package 20, and guides the upper yarn end to the yarn joining device 3. The unit controller 50 rotates the lower yarn catching tube 4 upward about the tube shaft 41 to guide the lower yarn to the yarn joining device 3. In this state, the upper yarn and the lower yarn are spliced by the yarn splicing device 3. At approximately the same time, the unit control section 50 closes the shutter member disposed on the path connecting the upper yarn catching pipe 5 and the blower duct, and stops the suction flow in the suction nozzle 52.

When it is determined that the upper yarn end is not caught by the upper yarn catching tube 5 even if the predetermined number of trials is passed (step S103, no), the unit control portion 50 transmits a signal to the first motor 29 to end the back-driving of the package 20 and start the back-and-forth driving of the package 20 (step S105). Further, the cause of the catching failure may be, but is not limited to, a phenomenon in which the upper yarn end is firmly caught by the surface portion of the package 20 due to a large number of hairiness of the yarn.

The unit control section 50 first drives the package 20 forward. After the package 20 is rotated by a predetermined first rotation amount, the unit control section 50 switches the rotation direction of the package 20 and back-drives the package 20 by a predetermined second rotation amount.

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

As described above, in the present embodiment, in one forward and reverse reciprocating drive, the amount of rotation of the reverse drive is larger than the amount of rotation of the forward drive. Therefore, the upper yarn swings 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 addition, in addition to the suction nozzle 52 being capable of applying suction flow to the upper yarn from various positions in the range of forward and reverse driving, the suction flow of the suction nozzle 52 can be applied to the upper yarn in an asymmetric manner so as to be biased to the reverse driving side (in other words, the side where unwinding of the upper yarn is promoted). As a result, a loosening effect based on the unique stimulus to the upper yarn can be obtained. Thus, even when the upper yarn is firmly caught on the surface of the package 20, the catch can be released with a high probability and the upper yarn end can be caught by the upper yarn catching tube 5.

Hereinafter, an example shown in fig. 5 (a) will be described. In fig. 5 (a), hairiness is generated in the middle of the upper yarn, and the hairiness is caught on the surface of the package 20. For convenience of explanation, hairiness portions are shown in fig. 5 with small quadrangle marks. In the state of fig. 5 (a), a part of the upper yarn on the front 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 hairiness portion is firmly caught, 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 a position above the nozzle 52, which is defined by the position of the hairiness section.

When the package 20 is driven positively from this state, the hairiness portion moves in the direction approaching the suction nozzle 52. In fig. 5 (b), a state in which the positive driving is completed and the hairiness section is substantially opposed to the suction nozzle 52 is shown. The curvature created by the upper yarn is straightened during movement of the hairiness section. By the above operation, since a large part of the upper yarn on the front end side than the hairiness position is sucked by the suction nozzle 52, 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 is to be bent again with the hairiness section as a boundary, but since the suction nozzle 52 has attracted the upper yarn to the vicinity of the hairiness section, the upper yarn is strongly pulled by the suction flow. Therefore, as the hairiness portion moves, a strong force in a direction of peeling off the surface of the package 20 (in other words, a direction of unwinding the upper yarn) acts on the hairiness portion via the upper yarn. Further, since the reverse driving rotation amount is larger than the forward driving rotation amount of the package 20, the strong peeling action is applied to the haired portion in a range of a long movement stroke of the haired portion. As a result, as shown in fig. 5 (c), the hairiness portion can be peeled off from the package 20 with high probability and sucked to the upper yarn catching tube 5.

In the present embodiment, the first rotation amount is set to be within the amount of one rotation of the package 20. That is, the rotation amount of the package 20 during forward driving in forward and reverse reciprocation 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 during the forward and reverse reciprocating drive to be slower than the winding speed of the yarn 12 on the package 20. The rotational speed of the package 20 in the forward and reverse reciprocating drive may be the same or different between the forward drive and the reverse drive.

It is also conceivable that the upper yarn end is not caught by the upper yarn catching tube 5 even if the package 20 is reciprocally driven as described above. In this case, the unit control portion 50 again reciprocally drives the package 20, and tries to catch the upper yarn end by the upper yarn catch tube 5. The unit control unit 50 repeats the trial of capturing the upper yarn end with the forward and backward reciprocating drive of the package 20 until the number of trials reaches a predetermined upper limit value. The upper limit value can be appropriately determined.

Every time the last thread end is caught, the unit controller 50 monitors the signal input from the thread detecting sensor 53 at an appropriate timing. When a signal indicating the presence of yarn in the upper yarn catching tube 5 is input from the yarn detecting sensor 53, the capturing of the upper yarn end is not required to be attempted, and therefore, even halfway, the unit control section 50 immediately ends the process of step S105.

When the upper limit value of the number of trials of catching the upper yarn end is two or more and the upper yarn end is not detected by the yarn detection sensor 53 in the first forward and backward reciprocating drive, the package 20 is driven to reciprocate (reciprocally repeatedly drive) twice or more.

As described above, in the one-time forward and backward reciprocating drive, the amount of rotation of the reverse drive is larger than the amount of rotation of the package 20 in the forward drive. Therefore, each time the forward and reverse reciprocating drive is performed, the package 20 is reversely driven by the difference in the rotation amounts in both directions. This means that the position of the upper yarn with respect to the suction nozzle 52 is deviated to the reverse side in each forward and reverse driving in the case of the reciprocal repetitive driving of the package 20. Therefore, the suction flow of the upper yarn through the suction nozzle 52 is more various in stimulus, and the hooking of the upper yarn to the surface of the package 20 can be more effectively released. In addition, even when the difference in the rotation amounts in the two directions in one forward and reverse reciprocating drive is small, the reverse drive can be accumulated by repeating the forward and reverse reciprocating drive a plurality of times, and as a result, the package 20 can be driven in reverse by a large rotation amount (for example, by an amount of 10 rotations). In this way, simply repeating the forward and reverse driving of the package 20 until the upper yarn is successfully caught can cause the suction flow of the suction nozzle 52 to act on the entire package 20, and the loosening action for the upper yarn can be repeatedly obtained with the fluctuation. As a result, the firm hook of the upper yarn, which has been released by the manual operation of 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 capturing the upper yarn end (in other words, the limit value related to the number of forward and backward reciprocating driving times) can be appropriately determined, and can be set to 100 times, for example. The upper limit value is preferably determined such that the reverse driving amount of the package 20 accumulated by the forward and reverse reciprocating driving is one week or more. This allows the suction nozzle 52 to act on the entire outer periphery of the package 20, and thus the probability of capturing the upper yarn end can be improved.

Thereafter, the unit control portion 50 determines whether or not the capturing of the upper yarn end by the upper yarn capturing tube 5 is successful (step S106). The process is the same as the process of step S103. When it is determined that the upper yarn end is successfully caught by the upper yarn catching tube 5 (yes in step S106), the unit controller 50 causes the yarn joining device 3 to join the yarn (step S104).

If it is determined that the upper yarn end is still not captured by the upper yarn capturing tube 5 as a result of the predetermined number of trials (step S106, no), the unit control section 50 stops the operation after displaying an alarm on the display 82 of the machine control device 80 (step S107). By interrupting and stopping the forward and reverse reciprocating drive at a point of time when the yarn catch failure occurs continuously to some extent, it is possible to avoid the unnecessary rotation of the package 20 and to achieve energy saving. Further, by displaying an alarm on the display 82, the operator can be prompted to peel off the upper yarn end strongly adhered to the surface of the package 20 by a manual operation.

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

Thereafter, the unit control unit 50 ends the process when, for example, another abnormality requiring the stop of the winding of the yarn 12 occurs in the winding unit 10 or when the stop of the winding unit 10 is instructed by the operator (step S109, yes). If such a situation does not occur (step S109, no), the unit control section 50 repeatedly executes the above steps S101 to S108.

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

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

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

At the timing of time t1, the unit control section 50 transmits a signal to the first motor 29 to start the back-driving of the package 20. The package 20 is back driven until a predetermined time elapses from time t 1. Fig. 6 shows a case where the trial of capturing the upper yarn end accompanying the back driving of the package 20 is performed at times t1, t2, and t3, respectively, and the capturing of the yarn fails.

In the example of fig. 6, the upper limit number of trials is set to three times for capturing the upper yarn end with the back driving of the package 20. Since the number of trials reaches the upper limit number of times, 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 driving of the package 20. The forward and reverse reciprocating driving of the package 20 is repeated as shown by times t4, t5, t6, … … until the capturing of the upper yarn end is successful.

The unit control section 50 monitors whether or not the yarn is successfully captured from the time point of time t 4. Fig. 6 shows an example in which the forward and reverse reciprocation driving of the package 20 is repeated 40 times or more, and as a result, it is first determined that the capturing of the upper yarn end is successful at the timing of time t 50. After the reverse rotation of the package 20 is continued to an appropriate timing later than the time t50, the unit control section 50 transmits a signal to stop the package 20 to the first motor 29. Further, at the timing of time t50, the unit control portion 50 rotates the upper yarn catching tube 5 downward. As a result, at the timing of time t51, the suction nozzle 52 reaches the yarn joining position. After that, yarn joining is performed by the yarn joining device 3.

At time t52, which is the timing when the yarn splicing 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 reciprocal drive of the package 20 may be constant from the beginning to the end of the reciprocal drive, or may vary in the middle. For example, after time t7 when the yarn catch test performed in the forward and reverse reciprocation driving of the package 20 fails three times in succession, the unit control unit 50 may perform the forward and reverse reciprocation driving again so that the rotational speed of the package 20 is slower than the rotational speed of the package 20 at the time of the initial forward and reverse reciprocation driving (from time t4 to time t 7). As a result, the speed of the forward and reverse reciprocating drive of the package 20 is reduced stepwise. At the point of time when the capturing of the upper yarn fails, it is suspected that the upper yarn is firmly caught on the surface of the package 20, and then by decreasing the rotational speed of the forward and reverse reciprocating drive, the effect of the suction flow of the suction nozzle 52 on the upper yarn can be enhanced, and the probability of success of capturing the upper yarn can be improved.

In the present embodiment, when the forward and backward reciprocating drive of the package 20 is performed in this way, the unit control section 50 notifies that the forward and backward reciprocating drive of the package 20 is being performed by using the display 82 of the station control device 80. This notification can be achieved by, for example, displaying an appropriate message on the display 82, but is not limited thereto. The operator can notice the change in the condition (yarn breakage and its handling) early on based on the display contents 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 capturing tube 5, and the unit control unit 50. The winding unit 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 to a normal rotational direction in which the yarn is wound and a reverse rotational direction in which the yarn is wound. The upper yarn catch tube 5 catches the yarn end from the package 20 by suction when the yarn 12 wound by the winding portion 2 is broken. The unit control section 50 controls the first motor 29. When the suction of the yarn end is started by the upper yarn catch tube 5, the unit control unit 50 performs forward and backward reciprocating driving of the package 20 from the forward driving to start rotating the package 20 in the winding direction of the yarn 12 and from the backward driving to start rotating the package 20 in the backward direction of the winding direction of the yarn 12 by a rotation amount larger than the forward driving until the catch of the yarn end by the upper yarn catch tube is successful.

Thus, by driving the package 20 back and forth, the upper yarn can be stimulated well by the catching action of the upper yarn catching tube 5 and the like. Further, since the package 20 is reversely driven by a rotation amount larger than that of the forward drive in the forward and reverse drive, it is expected that the upper yarn catch tube 5 applies an asymmetric stimulus to the upper yarn and promotes unwinding of the upper yarn. Therefore, even if the upper yarn is firmly caught on the surface of the package 20, the catch can be easily released and the upper yarn can be efficiently caught.

In the winding unit 10 of the present embodiment, the unit control unit 50 repeatedly performs the reciprocating drive for repeatedly performing the forward and reverse reciprocating drive on the package 20 as many times as necessary.

This ensures a plurality of opportunities to release the yarn hooking, and thus the upper yarn can be easily caught. Further, since the package 20 is reversely driven in stages every time the forward and reverse driving is completed, the upper yarn can be supplied with more various stimuli 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 winding unit 10 of the present embodiment, the unit control unit 50 can perform the forward and reverse reciprocating drive of the package 20 twice or more 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 accumulation of the forward and reverse reciprocating drive.

Thereby, the upper yarn catch tube 5 can be made 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: when the upper yarn is caught by the upper yarn catching tube 5 after the package 20 is repeatedly driven at least once, the rotational speed of the package 20 for forward and reverse driving is reduced and the forward and reverse reciprocating driving is performed again.

In this case, the rotational speed of the forward and reverse reciprocating drive in the reciprocating repetitive drive is automatically reduced in a situation where the catching of the upper yarn is expected to be difficult, and therefore, the probability that the upper yarn can be caught later 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 drive, after at least one forward and reverse reciprocating drive is performed on the package 20, if the upper yarn catch tube 5 fails to catch the upper yarn, the rotational speed of the forward and reverse drives of the package 20 is slowed down and the forward and reverse reciprocating drive is performed again.

In this case, the rotational speed of the forward and backward reciprocating drive automatically becomes slow in a situation where the capturing of the upper yarn is expected to be difficult, and therefore, the probability of capturing the upper yarn later can be improved.

In the automatic winder 100 according to the present embodiment, when the unit control section 50 reciprocally drives the package 20 (step S105), the rotational speed of driving the package 20 forward and backward is slower than the rotational speed of the package 20 when the yarn 12 is wound to form the package 20 (step S108).

This allows the upper yarn catch 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 amount of rotation of the package 20 in the forward drive included in one forward and reverse reciprocating drive in the reciprocating repetitive drive is within one rotation.

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

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

This makes it possible to smoothly start the subsequent operation after the upper yarn is successfully captured by the upper yarn capturing tube 5. In addition, when the possibility of successful upper yarn catching by the upper yarn catching tube 5 is low, wasteful forward and backward reciprocating driving of the package 20 can be prevented.

The automatic winder 100 of the present embodiment includes a display 82. When the number of times of execution of the forward and reverse reciprocating drive reaches the above-described limit value and the reciprocating drive is completed, the display 82 gives an alarm.

This makes it possible to promptly notify an operator or the like that the possibility of successful yarn capturing by the upper yarn capturing tube 5 in the future is low, and the reciprocating repetitive driving is completed.

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

Thus, the surrounding operator or the like can easily grasp that the package 20 is repeatedly driven to and fro for capturing the upper yarn.

The yarn capturing method using the automatic winder 100 (winder unit 10) of the present embodiment includes a winding step and a capturing step. The winding step winds the yarn 12 to form a package 20. The catching step draws out and catches the yarn 12 from the package 20 for yarn splicing when the yarn is broken in the middle of the winding step. In the above-described catching step, the forward and reverse reciprocating drive of the package 20, that is, the forward and reverse reciprocating drive 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 forward driving are performed a plurality of times.

Thus, even if the upper yarn is firmly caught on the surface of the package 20, the catch 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 a winding 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 embodiment are denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

The automatic winder 100 according to the present embodiment is different in that the plurality of winder units 10 each include a winding section 2x having a structure of the traverse device 123, rather than the winding section 2 having a structure of the winding drum 23 having the traverse groove 27. That is, the winding unit 2x includes a cradle 121 configured to be able to mount the winding bobbin 22, a contact roller 122, and a traverse device 123.

Cradle 121 detachably holds winding bobbin 22 (package 20). The cradle 121 is configured to be rotatable (swivelable) toward the front and rear sides of the winder unit 10. By the rotation of the cradle 121, the increase in the yarn layer diameter of the package 20 caused by the winding of the yarn 12 around the winding bobbin 22 can be absorbed. That is, even if the yarn layer diameter of the package 20 is changed by winding the yarn 12, the surface of the package 20 can be properly brought into 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 unit 2x rotationally drives the winding bobbin 22 by the package driving motor 125 to wind the yarn 12 on the surface of the winding bobbin 22 (or the surface of the package 20).

The rotation shaft of the package drive motor 125 is coupled to the winding bobbin 22 so as not to be rotatable relative to the winding bobbin 22 when the winding bobbin 22 is supported by the cradle 121 (so-called direct drive system). 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 and 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 is configured to be capable of coming into contact with the surface of the winding bobbin 22 or the surface of the package 20 from the lower side. The contact roller 122 is capable of supporting at least a portion of the weight of the winding tube 22 or package 20.

The traverse device 123 includes a traverse arm 131 and a traverse drive motor 132. The traverse arm 131 is rotatably provided and can hold the yarn 12 at its tip. 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 linked to the package driving motor 125 to reciprocate the traverse driving motor 132, and thereby traverses the yarn 12 wound around the package 20 at a predetermined angle of inclination.

The preferred embodiments of the present invention have been described above, but the above-described configuration can be modified as follows.

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

In the reciprocating motion of the package 20, it is possible to arbitrarily select whether the forward drive or the reverse drive is performed first.

Between the back driving of the package 20 shown in time t1 to time t4 of fig. 6 and the back and forth repeated driving of the package 20 shown in time t4 and thereafter, the package 20 may be rotated in an appropriate direction by an appropriate rotation amount and one or more trials of capturing the upper yarn end by the upper yarn capturing tube 5 may be performed simultaneously. For example, the forward driving and the reverse driving of the package 20 shown in japanese patent No. 4277227 may be performed before time t 4. When the upper yarn catching tube 5 is applied to the surface of the package 20, there may be a state in which only the loose middle portion of the upper yarn is sucked by the suction nozzle 52, not the upper yarn end. By rotating the package 20 disclosed in japanese patent No. 4277227, that state can be released. When the catch of the upper yarn end is attempted by the reciprocating repetitive driving at time t4 and after fig. 6, a long time is required until the catch of the upper yarn end is successful, and the operation efficiency of the winding unit 10 may be lowered. It is therefore beneficial to variously rotate the package 20 and attempt to catch the upper yarn end prior to the reciprocating repetitive drive transfer to the package 20.

The limitation of the reciprocating repetitive drive of the package 20 can also be determined based on the elapsed period after the start of the reciprocating repetitive drive instead of the number of reciprocating movements.

The state in which the package 20 is being reciprocated may be notified by a lamp provided separately to the machine control device 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 winding unit 10. The alarm described in step S107 of fig. 4 can be similarly implemented by a suitable method other than the display 82.

In the second embodiment, the configuration may be as follows: the winding unit 2x is provided with a lifting mechanism capable of rotating the cradle 21 and moving the package 20 away from the contact roller 122, and the unit control unit 50 reciprocates the package 20 in a state in which the lifting mechanism lifts the package 20 away from the contact roller 122.

In the above embodiment, the explanation was made with respect to the configuration in which the upper limit value of the number of trials of capturing the upper yarn end (limit value related to the number of reciprocations) is set to, for example, 100 times, but the present invention is not limited thereto. For example, the upper limit value of the number of trials of the upper yarn end may be set to 50 and repeated for two groups. By grouping, the successive trials of the catching of the upper yarn end are temporarily interrupted, so that a different stimulus of reciprocation from the first group can be provided in the second group. This can improve the success rate of yarn catching.

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

Claims

1. A yarn winding device is characterized by comprising:

a winding unit that winds a yarn to form a package;

A driving unit that rotationally drives the package and is capable of switching a rotational direction of the package to a forward rotational direction in which the yarn is wound and a reverse rotational direction in which the yarn is wound;

A yarn catching unit that catches the yarn from the package by suction when the yarn wound by the winding unit is broken; and

A control unit that controls the driving unit,

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

When the forward and reverse reciprocating driving is performed, the control part firstly drives the package forward, then switches the rotating direction of the package and drives the package backward,

The control unit causes the driving unit to perform reciprocating repetitive driving in which the forward and reverse reciprocating driving is repeated a plurality of times,

The control unit causes the driving unit to perform the reciprocating repetitive driving until the package is reversely rotated at least one turn from a start time point of the forward and reverse reciprocating driving by repetition of the forward and reverse reciprocating driving.

2. The yarn winding device as claimed in claim 1, wherein,

The control unit is configured to, after the package is repeatedly driven at least once, slow down the forward and reverse driving speeds of the package and to again perform the repeatedly driven package when the yarn catching unit fails to catch the yarn.

3. The yarn winding device as claimed in claim 1, wherein,

In the reciprocating repetitive driving, the control unit slows down the speed of forward and reverse driving of the package and again performs the forward and reverse reciprocating driving when the yarn catching unit fails to catch the yarn after performing the forward and reverse reciprocating driving of the package at least once.

4. The yarn winding device as claimed in claim 1, wherein,

The control unit drives the drive unit to reciprocate repeatedly at a lower rotational speed for driving the package in the forward and reverse directions than the rotational speed of the package when the yarn is wound to form the package.

5. Yarn winding device as claimed in claim 2, characterized in that,

6. A yarn winding device as claimed in claim 3, wherein,

7. Yarn winding device as claimed in any of the claims 1-6, characterized in that,

The rotation angle amount of the package in the forward drive included in one of the forward and reverse reciprocating drives is within an amount of one rotation.

8. Yarn winding device as claimed in any of the claims 1-6, characterized in that,

The yarn winding device is provided with a detection part for detecting whether the yarn exists in the yarn capturing part,

The control unit causes the detection unit to execute a detection operation of whether or not a yarn is present in the yarn catching unit on the yarn catching unit in parallel with execution of the reciprocating repetitive drive, and ends the reciprocating repetitive drive when it is determined that the yarn catching unit is successful in catching 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 reciprocating driving when the number of times of execution of the reciprocating driving or a period of time elapsed from a start time point of the reciprocating driving reaches a predetermined limit value even when the yarn capturing unit does not successfully capture the yarn based on a detection result of the detection unit.

9. The yarn winding device as claimed in claim 7, wherein,

10. The yarn winding device as claimed in claim 8, wherein,

The device is provided with an alarm part,

The alarm unit issues an alarm when the number of times of execution of the forward and reverse reciprocating drive or the period elapsed from the start time point of the reciprocating repetitive drive reaches the limit value and the reciprocating repetitive drive is ended.

11. The yarn winding device as claimed in claim 9, wherein,

The device is provided with an alarm part,

12. Yarn winding device as claimed in any of the claims 1-6, characterized in that,

The yarn winding device includes a notification unit that notifies that the package is being repeatedly driven to and fro.

13. The yarn winding device as claimed in claim 7, wherein,

14. The yarn winding device as claimed in claim 8, wherein,

15. The yarn winding device as claimed in claim 9, wherein,

16. The yarn winding device as claimed in claim 10, wherein,

17. The yarn winding device as claimed in claim 11, wherein,

18. Yarn winding device as claimed in any of the claims 1-6, characterized in that,

The winding part is provided with a winding drum, a spiral traversing groove is formed on the outer peripheral surface of the winding drum, which is contacted with the outer periphery of the winding drum to rotate the winding drum,

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

19. The yarn winding device as claimed in claim 7, wherein,

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

20. The yarn winding device as claimed in claim 8, wherein,

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

21. The yarn winding device as claimed in claim 9, wherein,

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

22. The yarn winding device as claimed in claim 10, wherein,

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

23. The yarn winding device as claimed in claim 11, wherein,

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

24. A yarn capturing 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 broken in the middle of the winding step,

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

When the forward and reverse reciprocating driving is performed, the package is first driven forward, then the rotation direction of the package is switched and the package is driven backward,

In the capturing step, the forward and reverse reciprocating driving is repeated a plurality of times,

And performing the reciprocating repetitive driving until the package is reversely rotated at least one turn from the start time point of the forward and reverse reciprocating driving by the repetition of the forward and reverse reciprocating driving.