JP2001064849A - Method and system for weft treatment in loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject method and system intended for improving the sureness of removing unnecessary wefts lying on the cloth fell of a woven fabric and gripped by a weft gripper. SOLUTION: This system works as follows: when a mispicking occurs, a loom control computer Co commands a specified magnitude of slow reversion of a loom driving motor Mo and that of an exclusive motor M1; as a result of the former slow reversion, the shed for a warp T expands maximally so as to enable missed yarns Ym to be removed off the cloth fell W1 of a woven fabric W; whereas as a result od the latter slow reversion, a grip rotator 29 makes a slow reversion by a specified magnitude, resulting in sending the missed yarns gripped between the grip rotator 29 and a stationary gripper 30 toward the woven fabric pull-back direction; based on the detection result of weft presence/absence from a weft detector 19, the computer Co judges whether a reversion action of the exclusive motor M1 is to be made again or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping rotating body for gripping a weft end near the front of a woven fabric, which rotates at the time of weaving in accordance with the moving speed of the woven fabric. The present invention relates to a weft processing method and apparatus in a loom provided with a weft gripping device for sending out the weft end gripped between the weft in the moving direction of the woven fabric by rotation of a gripping rotating body.

[0002]

2. Description of the Related Art When weaving a fabric having a low weft density, such as a glass fabric, with a shuttleless loom such as a jet loom, it is difficult to form an ear tissue. Therefore, actual Kaihei 1-1
As disclosed in JP-A-190080 and JP-A-2-118141, it is necessary to grip the weft end near the cloth fell on the cloth end side. Japanese Utility Model Laid-Open Publication No. 1-119080 discloses an apparatus for gripping a weft end between a top surface of a fixed blade for weft cutting and a wire spring. JP-A-2-118
No. 141 discloses a device for gripping a weft end by an air chuck.

However, in the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 1-119080, the woven fabric moves, but the weft ends are subjected to the gripping action of the fixed spring and the linear spring in which the weft ends are immovably arranged. Receiving weft is strongly pulled in the direction opposite to the moving direction of the fabric. Such a pulling action causes collapse of the tissue near the weave.

In the apparatus disclosed in Japanese Patent Application Laid-Open No. 2-118141, the weft end is gripped by an air chuck at a position as far as possible from the cloth fell. When the air chuck device is applied to grip the weft end near the cloth fell, the gripping of the weft end by the air chuck is performed during the pause of the fabric take-up operation. Does not occur. However, the adoption of such a gripping mechanism can be applied only to a loom having a woven fabric take-up mechanism that intermittently takes up a woven fabric.

[0005] Japanese Utility Model Laid-Open Publication No. 1-119080,
Japanese Patent Application Laid-Open No. H10-204758 discloses a weft holding device for avoiding the problem of JP-A-118141. This weft gripping device is a rotating body that rotates at least one of a pair of gripping bodies for gripping a weft end in accordance with movement of a fabric, and the gripped weft end is moved in the moving direction of the fabric by rotation of the rotating body. It is configured to send positively. In this weft holding device, the rotation driving force of the rotating body is obtained from a dedicated motor independent of the loom driving motor.

[0006] When a weft insertion error occurs, the erroneous weft insertion yarn must be removed from the woven fabric. Therefore, it is necessary to release the error yarn from the gripping action between the rotating body and the other gripping body. In the device disclosed in Japanese Patent Application Laid-Open No. 10-204758, the dedicated motor is rotated in the reverse direction to release the error yarn from the gripping action between the rotating body and the other gripping body.

[0007]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. Hei 10-2047
In the device disclosed in Japanese Patent No. 58, the reverse rotation amount of the dedicated motor for releasing the miss yarn from the gripping action between the rotating body and the other grip body may be the reverse rotation amount for releasing the miss yarn.
However, when the reverse rotation amount of the dedicated motor is set to the minimum (for example, the same reverse rotation amount as the forward rotation amount of the dedicated motor corresponding to one rotation of the loom), the error yarn is released from the gripping action between the rotating body and the other gripping body. It may not be done. Conversely, if the amount of reverse rotation of the dedicated motor is too large, not only will the missed yarn be released from the gripping action of the rotating body and the other gripping body, but also other non-removable wefts gripped by the warp will be pulled. There is a possibility that the tissue at the end of the woven fabric may be loosened.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the reliability of removing unnecessary wefts on a cloth front of a woven fabric held by a weft holding device.

[0009]

SUMMARY OF THE INVENTION For this purpose, the present invention relates to a gripping and rotating member for holding a weft end between a gripping rotating body and another gripping body near a cloth fell of a woven fabric. The present invention is directed to a loom including a weft gripping device that sends out in the moving direction of a woven fabric by rotation of a body, and in the invention according to claim 1, the unnecessary weft gripped by the gripping rotary body and the gripping body is defined as the gripping rotary body. The gripping rotating body is reversed to release from the gripping action with the gripping body, and whether or not the unnecessary weft is released from the gripping action with the gripping rotating body and the gripping body is detected by a release detecting unit, When the release detecting means detects that the unnecessary weft is released from the gripping action between the gripping rotating body and the gripping body, the reverse rotation of the gripping rotating body is stopped.

Whether or not the unnecessary weft has been released from the gripping action between the gripping rotating body and the gripping body can be confirmed by the release detecting means. By appropriately setting the maximum amount of reversal of the gripping rotating body, it is possible to avoid the possibility of pulling another weft too much.

According to the second aspect of the present invention, the reverse rotation driving means for reversely rotating the gripping rotary body, and the unnecessary weft held by the gripping rotary body and the gripping body is driven by the release driving of the reverse rotation driving means. Release detecting means for detecting whether or not the gripping rotating body and the gripping body are released from the gripping action by the reverse rotation of the gripping rotating body, and after the reverse rotation driving means based on the detection result of the release detecting means, A weft processing device comprising a control means for controlling driving is constituted.

Whether or not the unnecessary weft has been released from the gripping action between the gripping rotating body and the gripping body can be confirmed by the presence of the release detecting means. Therefore, when the release detecting means confirms that the unnecessary weft has been released from the gripping action of the gripping rotating body and the gripping body, it is possible to appropriately select the control of the reverse rotation driving means thereafter. Further, when the release detecting means confirms that the unnecessary weft is not released from the gripping action of the gripping rotating body and the gripping body, the control of the reverse rotation driving means can be appropriately selected thereafter.

According to a third aspect of the present invention, in the second aspect,
A weft separating means for separating the unnecessary weft from the weave of the woven fabric by an air flow, and a weft separation for detecting whether or not the unnecessary weft is separated from the weave of the woven fabric by a separating action of the weft separating means. The release detecting means comprises a detecting means.

The state in which the unnecessary weft is separated from the cloth fell is a state in which the unnecessary weft is released from the gripping action between the gripping rotating body and another gripping body. The configuration for checking whether the unnecessary weft has been released from the gripping action between the gripping rotating body and the other gripping body by detecting whether the unnecessary weft has been separated from the weaving cloth is configured such that the unnecessary weft is separated from the gripping rotating body and the other rotating body. This is reliable and simple in checking whether or not the gripping action has been released from the gripping body.

According to a fourth aspect of the present invention, in the third aspect,
The loom is a jet loom for injecting the weft from the weft insertion nozzle into the warp shedding, and the weft separation detecting means determines whether or not the weft injected from the weft insertion nozzle reaches a predetermined position on the weft insertion end side. The weft separation means separates the unnecessary weft from the cloth fell so as to pass through the detection area of the weft arrival detection means.

The construction of the weft arrival detecting means as the weft separation detecting means is simple. In a fifth aspect of the present invention, in the fourth aspect, the weft separating means includes a weft tension applying means for introducing the weft from the weft guide passage into the weft catching passage and catching the weft by an air flow.

Unwanted weft is captured by the air flow of the weft tension applying means and separated from the cloth fell. In a sixth aspect of the present invention, in any one of the second to fifth aspects, the reverse drive means is a dedicated motor independent of a loom drive motor.

A dedicated motor independent of the loom drive motor is suitable as the reverse drive means.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a jet loom will be described below with reference to FIGS.

As shown in FIG. 2, a weft insertion main nozzle 12 is provided on the slay 11, and the weft Y is injected into the opening of the warp T by the injection action of the weft insertion main nozzle 12. A deformed reed 14 is erected on the slay 11. The weft yarn Y injected into the opening of the warp yarn T flies in a weft guide passage 141 (shown in FIG. 1) on the front surface of the deformed reed 14 by relay injection of a plurality of auxiliary nozzles for weft insertion 13 and 13A. A blow nozzle 15 is provided immediately below the injection path of the weft insertion main nozzle 12 which is a weft insertion nozzle. The injection direction of the blow nozzle 15 intersects with the injection path of the main nozzle 12 for weft insertion. The main nozzle 12 for weft insertion, the auxiliary nozzles 13 and 13A for weft insertion and the blow nozzle 15 are electromagnetic on-off valves 16, 17, 17A and 18
Is connected to a pressure air supply source (not shown).
The solenoid on-off valves 16, 17, 17A, 18 are subjected to the excitation and demagnetization control of the loom control computer Co.

As shown in FIG. 1, the slab 11 is supported by a swing shaft 21 via a slide 20. The swing shaft 21 reciprocates by receiving a driving force from the loom driving motor Mo via a reciprocating drive mechanism. The reciprocating rotation of the swing shaft 21 causes the slay 11 to perform a reciprocating beating motion. The loom drive motor Mo is controlled by the loom control computer Co.

As shown in FIG. 5, the weft yarn Y supplied to the weft insertion main nozzle 12 is passed through a winding type weft length measuring and storing device 31. The yarn winding tube 311 is driven to rotate by a winding motor 312. The weft drawn out of the yarn winding tube 311 with the rotation of the yarn winding tube 311 is controlled from being pulled out from the yarn winding surface 313 by engaging and disengaging the locking pin 321 driven by the electromagnetic solenoid 32 and the yarn winding surface 313. You.

In the vicinity of the yarn winding surface 313, a reflection type photoelectric sensor type weft unwind detector 33 is provided. The unwinding detection signal output from the weft unwinding detector 33 is sent to the loom control computer Co. Loom control computer Co
Controls the excitation and demagnetization of the electromagnetic solenoid 32 based on the weft unwinding information from the weft unwinding detector 33 and the loom rotation angle information from the rotary encoder 23 for detecting the loom rotation angle. By this excitation / demagnetization control, the engagement between the thread winding surface 313 and the locking pin 321 and the locking pin 3
21 is carried out, and the unwinding of the wound weft from the yarn winding surface 313 and unwinding prevention are performed. The wound weft on the yarn winding surface 313 is injected into the opening of the warp T by the injection action of the main nozzle 12 for weft insertion.

As shown in FIG. 5, a weft detector 19 is provided at the end of the weft insertion. As shown in FIG. 3, the detection area 191 of the weft detector 19 is set on the same path as the weft guide path 141. When the weft insertion is normally performed, the leading end of the weft Y reaches the detection area 191 of the weft detector 19. When the weft insertion is performed normally, that is, when the weft detector 19, which is the means for detecting the arrival of the weft, detects the arrival of the weft, the loom control computer Co performs a cutting operation on the electromagnetic cutter 22 after beating. Let The weft Y beaten to the weave W1 of the woven fabric W by the deformed reed 14 is cut by the cutting operation of the electromagnetic cutter 22. The loom control computer Co grasps the rotation angle of the loom based on the angle detection information from the rotary encoder 23. If the weft detector 19 does not detect the weft within a predetermined period during one rotation of the loom, the loom control computer Co determines that the weft insertion is abnormal, and the electromagnetic on / off valves 16, 17, 17A, the electromagnetic cutter 22, and the electromagnetic solenoid 32 And the operation of the loom drive motor Mo and the winding motor 312 are stopped.

As shown in FIG. 3, a nozzle block 34 is provided upright on the side of the weft detector 19. An introduction recess 341 is formed in the nozzle block 34. The introduction recess 341 is on an extension of the weft guide passage 141. A stretch nozzle 342 is provided on the lower surface of the introduction recess 341. The stretch nozzle 342 is connected to the above-mentioned pressure air supply source via an electromagnetic on-off valve 35. A capture pipe 36 is attached to the upper part of the nozzle block 34. As shown in FIG. 4, the capture pipe 36 is
41, the inlet of the capture pipe 36 and the stretch nozzle 342 face each other. The air jet flow from the stretch nozzle 342
1 and is blown into the capture pipe 36. The opening of the capture pipe 36 on the side opposite to the introduction port is connected to a weft collecting section (not shown).

The solenoid on-off valve 35 is a loom control computer C
Under the excitation / demagnetization control of o. The loom control computer Co controls the excitation and demagnetization of the electromagnetic on-off valve 35 in accordance with the weft insertion timing. The solenoid on-off valve 35 is provided with
It is excited before reaching 1 and demagnetized before beating.
When the weft is inserted normally, the leading end of the weft Y is blown into the capture pipe 36 by the air jetting action from the stretch nozzle 342. The weft Y blown into the capture pipe 36 is given an appropriate tension by the air flow. That is, the electromagnetic on-off valve 35, the stretch nozzle 342, and the capture pipe 36 constitute a weft tension applying means.

As shown in FIG. 2, the cloth fell W on the weft insertion end side is shown.
A weft separation nozzle 37 is disposed immediately above the woven fabric W in the vicinity of No. 1. The weft separation nozzle 37 is directed toward the cloth fell W1 from the woven fabric W side toward the warp opening side. The weft separation nozzle 37 is connected to a pressure air supply source via an electromagnetic on-off valve 38. The solenoid on-off valve 38 is connected to the loom control computer C
Under the excitation / demagnetization control of o.

A driven timing pulley 26 is fixed to a support shaft 25 rotatably supported by the support frame 24. A dedicated motor M1 of a stepping motor type is mounted on the support frame 24. A drive timing pulley 27 is fixed to the output shaft of the dedicated motor M1. A timing belt 28 is wrapped around the driven timing pulley 26 and the drive timing pulley 27. A gripping rotating body 29 is fixed to one end of the support shaft 25. An elastic ring 29 made of rubber is provided on the peripheral surface of the gripping rotating body 29.
1 (shown in FIG. 1) is fitted. Gripping rotating body 29
A fixed gripping body 30 is disposed immediately below. The upper surface of the fixed gripper 30 is in contact with the peripheral surface of the elastic ring 291. The beaten weft Y is cut by the electromagnetic cutter 22 and at the same time, the gripping rotating body 2 is moved by the movement of the woven fabric W.
The weft end portion Y1 is introduced into the gripping region between the grip 9 and the fixed gripping body 30, and is gripped between the gripping rotating body 29 and the fixed gripping body 30. The weft end Y1 gripped between the gripping rotating body 29 and the fixed gripping body 30 is sent in the moving direction of the woven fabric W by the rotation of the gripping rotating body 29 due to the forward rotation of the dedicated motor M1. The special motor M1 is controlled by the loom control computer Co.

FIGS. 10 to 14 are flowcharts showing a weft processing control program executed by the loom control computer Co when a weft insertion error occurs. Hereinafter, the weft processing control will be described based on this flowchart.

When a weft insertion error occurs, the loom control computer Co instructs the loom drive motor Mo and the dedicated motor M1 to stop operating, and also commands the electromagnetic on-off valve 18 to be excited, and the blow nozzle 15 ejects. Then, the electromagnetic solenoid 32 is excited, and the locking pin 321 is moved to the thread winding surface 313.
Separate from. When the locking pin 321 is separated from the yarn winding surface 313, the winding thread on the yarn winding surface 313 is released from the locking action of the locking pin 321. The winding yarn released from the locking action of the locking pin 321 is the mis-yarn Y
The yarn is drawn out from the yarn winding surface 313 and unwound by the injection action of the blow nozzle 15 on the succeeding weft Ye following m. The weft unwinding detector 33 detects this unwinding, and when one winding is unwound, the electromagnetic solenoid 32 is demagnetized. Due to this demagnetization, the locking pin 321 is engaged with the yarn winding surface 313, and the unwinding of the winding yarn from the yarn winding surface 313 is prevented. As shown in FIG. 5, the injection action of the blow nozzle 15 moves the weft Ye following the missed yarn Ym in which weft insertion has failed to a position outside the cutting area of the electromagnetic cutter 22. The miss yarn Ym is beaten by the cloth fell W1. The loom stops just before the next beating after the deformed reed 14 beats the miss yarn Ym.

Next, the loom control computer Co operates the loom drive motor Mo by a predetermined amount of reverse rotation and the dedicated motor M
1 is commanded to perform a slow reverse rotation of the predetermined amount σ1. The loom is rotated one and a half times by the reverse rotation of the loom drive motor Mo by a predetermined amount, whereby the deformed reed 14 moves to the last retreat position and the warp T
Is the maximum opening capable of removing the miss yarn Ym from the cloth fell W1 of the woven fabric W. Also, the gripping rotating body 29 is a dedicated motor M1.
The reverse rotation of the predetermined amount σ1 causes the reverse rotation by the predetermined amount Σ1, and the end of the miss yarn Ym gripped between the gripping rotating body 29 and the fixed gripping body 30 is sent in the woven fabric pullback direction. The predetermined reverse rotation amount Σ1 of the gripping rotating body 29 due to the release driving of the dedicated motor M1 is determined by the fact that the end of the miss thread Ym gripped between the gripping rotating body 29 and the fixed gripping body 30 is, for example, when weaving. It is set so that the woven fabric W is fed in the woven fabric retraction direction by the movement amount of the woven fabric W corresponding to one half rotation of the loom.

Next, the solenoid on-off valve 18 is demagnetized, and the injection of the blow nozzle 15 stops. Then, the electromagnetic solenoid 32 is excited, and the locking pin 321 is separated from the thread winding surface 313. Also, the electromagnetic on-off valves 16, 17, 17A, 18 are excited, and the weft insertion main nozzle 12, the weft insertion auxiliary nozzles 13, 13A, and the stretch nozzle 342 eject.
When the locking pin 321 is separated from the yarn winding surface 313, the winding thread on the yarn winding surface 313 is released from the locking action of the locking pin 321. The winding thread released from the locking action of the locking pin 321 is drawn out and unwound from the yarn winding surface 313 by the jetting action of the weft insertion main nozzle 12 with respect to the succeeding weft Ye. The weft unwinding detector 33 detects this unwinding, and when the winding yarn is unwound for a preset m windings, the electromagnetic solenoid 32 is demagnetized. Due to this demagnetization, the locking pin 321 is engaged with the yarn winding surface 313, and the unwinding of the winding yarn from the yarn winding surface 313 is prevented. The succeeding weft Ye remains connected to the miss yarn Ym, and the succeeding weft Ye receives the jetting action of the weft insertion main nozzle 12 and the weft insertion auxiliary nozzles 13 and 13A. This jetting action pulls the succeeding weft Ye in the weft insertion direction.

After the electromagnetic solenoid 32 is demagnetized, the electromagnetic on / off valves 16 and 17 are demagnetized, and the injection of the weft insertion main nozzle 12 and the weft insertion auxiliary nozzle 13 is stopped. Then
The loom drive motor Mo performs slow forward rotation by a predetermined amount, and as shown in FIG. 7, the deformed reed 14 moves to a cutting position near the beating position. Then, the electromagnetic cutter 22 is demagnetized, and the electromagnetic cutter 22 performs a cutting operation. The subsequent weft Ye is fed to the weft insertion main nozzle 1 by the cutting operation of the electromagnetic cutter 22.
2 is cut and separated. The length of the succeeding weft Ye for m windings is set to a length of one or more weft insertions. Therefore, the cut end of the weft Ye cut and separated from the weft insertion main nozzle 12 reaches the introduction concave portion 341 even when the miss yarn Ym is not separated from the weave front W1 at all.

After the cutting operation of the electromagnetic cutter 22, the loom driving motor Mo is rotated in the reverse direction by a predetermined amount, the deformed reed 11 retreats to the last retreat position, and the warp T forms a maximum opening where the miss yarn Ym is not gripped. The weft detector 19 detects the presence or absence of a weft in the detection area 191. When the succeeding weft Ye reaches the detection area 191, the weft detector 19 detects the weft.
The presence or absence of the succeeding weft Ye in 91 is detected. After the weft cutting operation of the electromagnetic cutter 22, when the weft detector 19 does not detect the presence of the weft for a predetermined time t1, the loom control computer Co commands the demagnetization of the electromagnetic on-off valves 17A and 35, and the auxiliary nozzle 13A for weft insertion. And the stretch nozzle 342 stops injection. Then, the loom control computer Co commands the operation of the alarm device 39, and the alarm device 39
Operates.

After the weft detector 19 detects the presence of a weft within the predetermined time t1, and the state in which the weft detector 19 does not detect the absence of the weft (that is, the state in which the presence of the weft is detected) elapses the predetermined time t2, the control of the loom is started. The computer Co instructs the dedicated motor M1 to perform a slow reverse rotation of the predetermined amount σ2. The gripping rotating body 29 is slowly reversely rotated by a predetermined amount Σ2 due to the slow reverse rotation of the special motor M1 by a predetermined amount σ2. The predetermined reverse rotation amount Σ2 of the gripping rotating body 29 due to the release driving of the dedicated motor M1 is determined by the amount of the end of the miss thread Ym gripped between the gripping rotating body 29 and the fixed gripping body 30 when weaving, for example. Loom 1
The woven fabric W is set so as to be fed in the woven fabric retraction direction by an amount corresponding to the rotation of the woven fabric W. When the number of re-rotations of the dedicated motor M1 reaches a preset number n, the weft detector 1
9 does not detect the absence of the weft yarn within the predetermined time t2, the loom control computer Co transmits the electromagnetic on-off valve 17A,
35, and the weft insertion auxiliary nozzle 13A and the stretch nozzle 342 stop jetting. Then, the loom control computer Co instructs the operation of the alarm device 39,
The alarm device 39 operates.

When the weft detector 19 detects the absence of a weft within the predetermined time t2 after the detection of the weft within the predetermined time t1,
The loom control computer Co instructs the loom drive motor Mo to reverse the rotation by a predetermined amount, and the deformed reed 14 moves to the beating position. Next, the loom control computer Co instructs the electromagnetic on-off valve 38 to be excited, and the weft separating nozzle 37 ejects.
When the weft detector 19 detects that there is no weft within the predetermined time t2, the erroneous yarn Ym is detected by the gripping rotating body 29 and the fixed gripping body 3.
In this state, the gripper is released from the gripping action of No. 0 and removed from the weave front W1 through the capture pipe 36.

The jet air from the weft separating nozzle 37 passes from the woven fabric W to the warp opening side through the weave W1, and as shown in FIG. 8, the weft Y inserted before the miss yarn Ym.
b receives the injection action of the weft separation nozzle 37. While the weft separation nozzle 37 is injecting, the loom drive motor Mo is slow-reverse by a predetermined amount, and the reed 14 moves to the rearmost position as shown in FIG. This is the maximum opening from which the leading weft Yb can be removed from the weave front W1. When the opening of the warp T becomes maximum, the electromagnetic on-off valve 38 is demagnetized, and the injection of the weft separating nozzle 37 stops.

The weft insertion end of the preceding weft Yb is to be separated from the cloth fell W1 by the jetting action of the weft separating nozzle 37. When the weft insertion end portion of the leading weft Yb is separated from the weave front W1, the weft insertion end portion of the leading weft Yb can reach the detection area 191 and the introduction recess 341. The weft insertion auxiliary nozzle 13A and the stretch nozzle 342 are jetting, and when the weft insertion end portion of the preceding weft Yb reaches the introduction recess 341, the preceding weft Y
The portion of the weft insertion end b is gripped in the capture pipe 36 and pulled.

The weft detector 19 detects the presence or absence of a weft in the detection area 191. When the leading weft Yb reaches the detection area 191, the weft detector 19 turns the detection area 191.
The presence or absence of the preceding weft Yb in the inside is detected. When the state in which the weft detector 19 does not detect the presence of the weft has passed for a predetermined time t1, the loom control computer Co detects the electromagnetic on-off valve 17A,
35, and the weft insertion auxiliary nozzle 13A and the stretch nozzle 342 stop jetting. Then, the loom control computer Co instructs the operation of the alarm device 39,
The alarm device 39 operates.

After the weft detector 19 detects the presence of the weft within the predetermined time t1, and the state in which the weft detector 19 does not detect the absence of the weft (that is, the state in which the presence of the weft is detected) elapses the predetermined time t2, the control of the loom is started. The computer Co instructs the dedicated motor M1 to perform a slow reverse rotation of the predetermined amount σ2. The gripping rotating body 29 is slowly reversely rotated by a predetermined amount Σ2 due to the slow reverse rotation of the special motor M1 by a predetermined amount σ2. If the weft detector 19 does not detect the absence of a weft within a predetermined time t2 when the number of re-reverse rotations of the special motor M1 reaches a preset number n, the loom control computer Co operates the electromagnetic on-off valve 1
7A and 18 are commanded to demagnetize, and the auxiliary nozzle 13A for weft insertion
And the stretch nozzle 342 stops injection. Then, the loom control computer Co commands the operation of the alarm device 39, and the alarm device 39 operates.

When the weft detector 19 detects that there is no weft within the predetermined time t2, the loom control computer Co instructs the demagnetization of the electromagnetic on-off valves 17A and 35, and the weft insertion auxiliary nozzle 13A and the stretch nozzle 342 perform injection. Stop. Then, the loom control computer Co instructs the loom drive motor Mo to perform a predetermined amount of reverse rotation, and the loom is shifted to a rotation position suitable for restarting weaving. Then, weaving is resumed.

According to the first embodiment, the following effects can be obtained. (1-1) The error yarn Ym gripped by the gripping rotating body 29 and the fixed gripping body 30 can be released from the gripping action of the gripping rotating body 29 and the fixed gripping body 30 by reversing the gripping rotating body 29. It is. When the miss yarn Ym is released from the gripping action of the gripping rotating body 29 and the fixed gripping body 30 and is removed from the weave front W1, the leading weft Yb also rotates the gripping rotating body 29 by reversing the gripping rotating body 29. It can be released from the holding action with the fixed holding body 30. Weave W of the leading weft Yb
The removal from No. 1 is performed in a case where the weaving state of the leading weft Yb changes due to the beating of the miss yarn Ym, resulting in a weaving scratch. Whether or not the missed yarn Ym or the preceding weft Yb serving as unnecessary weft is released from the gripping action between the gripping rotating body 29 and the fixed gripping body 30 is determined by the detection result of the presence / absence of the weft by the weft detector 19 serving as the weft separation detecting means. It is grasped by the loom control computer Co based on this. The loom control computer Co serves as control means for controlling the subsequent drive of the dedicated motor M1 based on the weft detection result of the weft detector 19. The configuration for controlling the subsequent driving of the dedicated motor M1 by judging whether or not to drive the dedicated motor M1 while grasping the success or failure of the release based on the detection result of the presence or absence of the weft by the weft detector 19 includes the dedicated motor M1. The problem of failure of release due to insufficient reverse rotation, and collapse of the structure due to excessive pulling of the weft woven before the unnecessary weft due to excessive reverse rotation of the dedicated motor M1 are solved.

(1-2) Missing yarn Ym or preceding weft Yb
Is released from the gripping action of the gripping rotating body 29 and the fixed gripping body 30 based on the detection result of the presence or absence of the weft by the weft detector 19, the reverse rotation of the gripping rotating body 29 is stopped. . In addition, the amount of reversal of the gripping rotating body 29 when releasing one unnecessary weft from the gripping action of the gripping rotating body 29 and the fixed gripping body 30 is maximum (に 関 し て 1 + n) with respect to the miss yarn Ym.
Σ2), and at most Σ2 × (n
+1). Therefore, if the amount of reverse rotation # 1 and # 2 of the gripping rotating body 29 at one time is appropriately set, it is possible to avoid the possibility of excessively pulling a weft that cannot be removed from the weave W1 other than the unnecessary weft that can be removed from the weave W1. it can.

(1-3) The miss yarn Ym is separated from the weave W1 by the jet air of the stretch nozzle 342, using the succeeding weft Ye as a clue. Accordingly, the stretch nozzle 342 serves as a weft separating means for the miss yarn Ym, which is an unnecessary weft, and the stretch nozzle 342 and the weft detector 1
9 constitutes a release detecting means for the miss yarn Ym. The leading weft Yb is separated from the cloth fell W1 by the jet air of the weft separating nozzle 37 and the jet air of the stretch nozzle 342. Therefore, the weft separating nozzle 37 and the stretch nozzle 342 constitute a weft separating means for the succeeding weft Yb, which is an unnecessary weft, and the weft separating nozzle 37, the stretch nozzle 342, and the weft detector 19 serve as a release detecting means for the succeeding weft Yb. Constitute. The state in which the unnecessary weft is separated from the weave W1 is a state in which the unnecessary weft is released from the gripping action between the gripping rotating body 29 and the fixed gripping body 30. Whether or not the unnecessary weft is separated from the weave W1 is grasped by the detection result of the presence or absence of the weft by the weft detector 19. The state in which the weft detector 19 detects the absence of the weft after detecting the arrival of the succeeding weft Ye is a state in which the succeeding weft Ye and the miss yarn Ym have all passed through the detection area 191, that is, the miss yarn Ym is removed from the weave W1. It shows the state that it was turned on. The state in which the weft detector 19 detects the arrival of the leading weft Yb and then detects the absence of the weft is a state in which the leading weft Yb has completely passed through the detection area 191, that is, a state in which the leading weft Yb has been removed from the weave W1. Is shown. Therefore, whether or not the unnecessary weft has been released from the gripping action of the gripping rotating body 29 and the fixed gripping body 30 can be reliably grasped by detecting whether or not the unnecessary weft has been separated from the cloth fell W1. That is, by detecting whether or not the unnecessary weft is separated from the weave front W1, the unnecessary weft is held by the gripping rotating body 29.
The configuration for confirming whether or not the release from the gripping action between the fixed gripper 30 and the fixed gripper 30 is a reliable configuration for confirming whether the release is successful. Further, such a configuration is simpler than a configuration in which it is directly detected whether or not the unnecessary weft is in the gripping region between the gripping rotating body 29 and the fixed gripping body 30 to confirm the success or failure of the release.

(1-4) The weft detector 19 detects whether the weft injected from the weft insertion main nozzle 12, which is the weft insertion nozzle, has reached a predetermined position on the weft insertion end side. It serves as presence / absence detection means. The stretch nozzle 342 serving as the weft separating means is provided in the detection area 19 of the weft detector 19.
The unnecessary weft yarn is separated from the cloth fell W1 so as to pass through No. 1. Such a configuration in which the weft arrival detection unit is used as the weft separation detection unit is a simple configuration that does not require a dedicated weft separation detection unit.

(1-5) The jet air of the stretch nozzle 342 introduces and captures the weft injected from the weft insertion main nozzle 12 during weaving from the weft guide passage 141 into the capture pipe 36 serving as the weft capture passage. . The configuration in which such a stretch nozzle 342 is included in the weft separating means is a simple configuration that does not require a dedicated weft separating means for reliably separating the entirety of the miss yarn Ym or the preceding weft Yb from the cloth fell W1. is there. The weft separation nozzle 37 is used to separate only a part of the leading weft Yb from the weave W1 and attempts to separate the entire leading weft Yb from the weave W1 without using the stretch nozzle 342. In this case, it is necessary to arrange a large number of weft separation nozzles 37 in the weaving width direction.

(1-6) The configuration in which the dedicated motor M1 independent of the loom drive motor Mo is used as the reverse drive means is suitable for performing a fine reverse control to remove unnecessary wefts from the cloth fell W1. .

Next, a second embodiment shown in FIG. 15 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. The woven fabric W is drawn toward the expansion bar 43 by cooperation of the surface roller 40 and the pair of press rollers 41 and 42. The surface roller 40 obtains a driving force from the loom driving motor Mo. Press rollers 41 and 42 for pressing the woven fabric W on the peripheral surface of the surface roller 40 are supported by levers 44 and 45 via roller shafts 411 and 421, and the levers 44 and 45 are supported by support shafts 46 and 4.
7 so as to be rotatable. One press roller 4
A driving rotary body 48 is fixed to one roller shaft 411, and a driven rotary body 49 is rotatably supported on the support shaft 46. The peripheral surface of the driven rotator 49 is pressed against the peripheral surface of the drive rotator 48, and the driven rotator 49 rotates in the opposite direction to the press roller 41 with the rotation of the press roller 41. A drive timing pulley 50 is rotatably supported on the support shaft 46. The drive timing pulley 50 and the driven rotary body 49 are integrally connected, and the drive timing pulley 50 and the driven rotary body 49 can be relatively rotated with respect to the support shaft 46.

During weaving, the forward rotation of the surface roller 40 in the direction of taking up the woven fabric is performed by the press roller 41
8, driven rotating body 49, drive timing pulley 50, timing belt 51, driven timing pulley 52, support shaft 2
5 and transmitted to the gripping rotating body 29. This rotation transmission causes the gripping rotating body 29 to rotate in the direction indicated by the arrow R in FIG. When the loom rotates in the reverse direction, the reverse rotation of the surface roller 40 is transmitted to the gripping rotating body 29, and the rotation transmission causes the gripping rotating body 29 to rotate in the reverse direction.

A stepping motor type tensioning motor 53 is disposed near the orbit of the timing belt 51. An eccentric disk 53 is provided on the output shaft of the tension applying motor 53.
1 is fixed. The tension applying motor 53 is controlled by the loom control computer Co.

As shown by the solid line in FIG. 15, the eccentric disk 531 is at a standby position away from the trajectory of the timing belt 51 during weaving. When a weft insertion error occurs, the loom control computer Co performs the rotation control of the tension applying motor 53 instead of the reverse rotation control of the dedicated motor M1 in the flowcharts of FIGS. Other controls are shown in Fig. 1.
This is the same as the weft processing control in the flowcharts of FIGS. The rotation control of the tension applying motor 53 is a control in which the tension of the timing belt 51 is gradually increased while the eccentric disk 531 is in contact with the timing belt 51. The change in the increase in the tension of the timing belt 51 is performed by moving the gripping rotating body 29 with the arrow R due to the backlash between the timing belt 51 and the driven timing pulley 52.
Will gradually rotate in the opposite direction. Gripping rotating body 29
The portion of the unnecessary weft held between the holding member 30 and the fixed holding member 30 is sent from the woven fabric W side to the warp opening side so as to be released from the holding action of the holding rotating member 29 and the fixed holding member 30.

In this embodiment, the same effects as those of the items (1-1) to (1-5) in the first embodiment can be obtained. In the present invention, the following embodiments are also possible. (1) In the first embodiment, the gripping rotator 29 after the release detecting means detects that the unnecessary weft has not been released from the gripping action between the gripping rotator 29 and the fixed gripper 30.
The amount of reversal at the time of re-reversal should be smaller than the amount of reversal at the previous reversal. This further reduces the risk of excessively pulling the unremovable weft. (2) When the release detecting means detects that the unnecessary rotation of the holding rotating body 29 is released from the holding action of the holding rotating body 29 and the fixed holding body 30 by continuously performing the reverse rotation of the holding rotating body 29 without stopping the rotation. The reverse rotation of the gripping rotating body 29 is stopped. (3) A dedicated weft separation detecting means different from the weft detector 19 is used. (4) The first reversal of the gripping rotating body 29 is not performed at the same time as the formation of the maximum opening after the stop, but is performed after the cutting and after the weft detector 19 detects the presence of the yarn.

[0053]

As described above in detail, according to the present invention, unnecessary wefts gripped by the gripping rotating body and the gripping body are released from the gripping action of the gripping rotating body and the gripping body by the reversal of the gripping rotating body. Since the driving of the gripping rotating body is controlled based on the detection result of whether the weft is held or not, it is possible to improve the reliability of removing unnecessary wefts on the cloth front of the woven fabric gripped by the weft gripping device. It has an excellent effect.

[Brief description of the drawings]

FIG. 1 shows a first embodiment and is a side view of a main part incorporating a control block diagram.

FIG. 2 is a plan view of a main part.

FIG. 3 is a perspective view showing a weft arrival detection unit, a weft tension applying unit, and a weft separation nozzle.

FIG. 4 is a side sectional view showing a weft tension applying means and a weft separation nozzle.

FIG. 5 is a schematic plan view for explaining processing of a miss thread.

FIG. 6 is a schematic plan view for explaining processing of a miss thread.

FIG. 7 is a schematic plan view for explaining processing of a miss thread.

FIG. 8 is a schematic plan view for explaining processing of a preceding weft;

FIG. 9 is a schematic plan view for explaining processing of a preceding weft;

FIG. 10 is a flowchart showing a weft processing control program.

FIG. 11 is a flowchart showing a weft processing control program.

FIG. 12 is a flowchart showing a weft processing control program.

FIG. 13 is a flowchart showing a weft processing control program.

FIG. 14 is a flowchart showing a weft processing control program.

FIG. 15 is a partially cutaway side view showing the second embodiment.

[Explanation of symbols]

12 ... Weft insertion main nozzle that becomes the weft insertion nozzle. 1
4: Deformed reed. 141 ... weft guide passage. 19 ... Weft detector serving as weft separation detecting means. 191 ... Detection area. 29 ... Grip rotating body. 30: Fixed holding body serving as another holding body. 342
... Stretch nozzles serving as weft separation means. 37 ... weft separating nozzle which constitutes the weft separating means together with the stretch nozzle. M1: A dedicated motor serving as reverse rotation driving means. Co: loom control computer as control means. Ym: Mistake yarn that becomes an unnecessary weft. Yb: preceding weft which becomes unnecessary weft. W: Woven cloth.
W1 ... Woven cloth.

Continued on the front page (72) Inventor Hiroyuki Kanayama 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 4L043 AA04 BB10 4L050 AA14 AB08 CB05 CB09 CB17 CB20 CB35 EA01 EA03 EA06 EA14 EB05 EC15 ED01 ED11 ED23 ED34 EE03

Claims (6)

[Claims] 1. A weft end gripped between a gripping rotating body for gripping a weft end near a weaving cloth and another gripping body in the moving direction of the woven fabric by rotation of the gripping rotating body. In the weft processing method in a loom having a weft gripping device for sending out, the gripping rotation is performed to release unnecessary wefts gripped by the gripping rotary body and the gripping body from the gripping action of the gripping rotary body and the gripping body. The body is reversed, and whether or not the unnecessary weft is released from the gripping action between the gripping rotating body and the gripping body is detected by release detection means, and the unnecessary weft is gripped by the gripping rotating body and the gripping body. A weft processing method in a loom for stopping reverse rotation of the gripping rotating body when the release detecting means detects that the gripping rotary body has been released from the operation. 2. A weft end gripped between a gripping rotating body for gripping a weft end near a weaving cloth and another gripping body in a moving direction of the woven fabric by rotation of the gripping rotating body. In a weft processing device in a loom having a weft gripping device for sending out, a reverse rotation driving means for reversing the gripping rotary body, and unnecessary wefts gripped by the gripping rotary body and the gripping body are provided by the reverse rotation driving means. Release detecting means for detecting whether or not the gripping rotating body and the gripping body are released from the gripping action by the reverse rotation of the gripping rotating body by the release drive; and the reverse rotation driving based on a detection result of the release detecting means. And a control means for controlling the driving of the means. 3. A weft separating means for separating the unnecessary weft from the weaving cloth of the woven fabric by an air flow.
The weft processing device according to claim 2, further comprising: a weft separation detecting unit configured to detect whether or not the unnecessary weft is separated from the cloth fell of the woven fabric by a separating operation of the weft separating unit. 4. The weaving machine is a jet loom for injecting a weft from a weft insertion nozzle into a warp shedding, and the weft separation detecting means detects that the weft injected from the weft insertion nozzle has a predetermined weft insertion end side. 4. A weft arrival detecting unit for detecting whether or not the weft has reached a position, wherein the weft separating unit separates the unnecessary weft from the weave so as to pass through a detection area of the weft reaching detecting unit. 5. A weft processing device in a loom according to item 5. 5. A weft processing device for a weaving machine according to claim 4, wherein said weft separating means includes a weft tension applying means for introducing a weft from a weft guiding passage into a weft catching passage and catching the weft by an air flow. 6. The weft processing apparatus for a loom according to claim 2, wherein said reverse rotation drive means is a dedicated motor independent of a loom drive motor.