JPH0718076B2 - Weft processing method for shuttleless loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for treating a weft yarn woven into a woven fabric immediately before a machine stand is stopped in a shuttleless loom such as a jet loom, a rapier loom, or a gripper loom. is there.

(Prior art) It is possible to expect much higher productivity for shuttleless looms such as jet looms compared to shuttleless looms, and the trend of adopting shuttleless looms is remarkable in recent years, but weft insertion error rate It is a well-known fact that it is higher than that of a shuttlecock loom. When a weft insertion error occurs, the machine is stopped based on the weft insertion error detection signal from the weft detector, but in high-speed weaving machines such as a shuttleless loom, one machine revolution or more is taken into consideration to prevent damage to each part. Since the machine base is stopped after the inertial operation, the weft insertion error (hereinafter referred to as miss yarn) is beaten to the machine base stop straight line and woven into the woven cloth.

Japanese Patent Laid-Open Nos. 58-220856 and 59-21 disclose a weft yarn processing device for removing from the woven fabric the above-mentioned miss yarn which becomes a weaving flaw of the woven fabric.
No. 757 is disclosed.

In JP-A-58-220856, a weft processing device having one finger for separating the miss yarn woven into the woven fabric from the woven fabric is located at a retracted position on a guide rail laid in the weft width direction. To the predetermined miss yarn processing position, slide on the woven fabric to allow the fingers to enter the warp yarn opening while rubbing the cloth fell from the outside of the warp yarn opening, and put the miss yarn from the woven fabric into the warp yarn opening. It is designed to separate into. The miss yarn thus separated is passed from the outside of the warp yarn through the fingers to the miss yarn withdrawing means inserted into the warp yarn by separating the warp yarn from the outside of the warp yarn and moving from the inside of the warp yarn to the outside of the warp yarn opening. A part of the miss yarn is pulled out from the inside of the warp opening to the outside of the warp opening together with the miss yarn drawing means. A part of the miss yarns drawn out of the warp yarn opening is pressed and held between the pair of pulling rollers, and by driving both pulling rollers, all the miss yarns are pulled out from the warp yarn opening. The miss yarn pulled out in this way is sucked and removed by the suction means.

On the other hand, in Japanese Unexamined Patent Publication No. 59-21757, a weft cutting device that prevents weft insertion during machine frame inertia operation, introduces and holds a weft insertion blocking weft between a pair of pressure contact rollers, and operates each weft insertion The cutting function is temporarily stopped to maintain the connection between the miss yarn and the following weft yarn without cutting, and the press roller is rotated to pull out the miss yarn from the warp opening,
A method of suction removal is disclosed.

(Problems to be Solved by the Invention) A problem in such a warp processing method is a drawing error of the miss yarn drawn out from the warp opening, that is, an accident of cutting the miss yarn during drawing. Although the grasped state by the warp is released to some extent, there is a possibility of cutting when the miss yarn to which a corresponding pulling resistance is given at the time of pulling out from the warp opening is pulled out at a high speed. Therefore, it is generally considered to keep the pulling speed of the miss yarn low to prevent pulling resistance and prevent the accident of miss yarn cutting, but this leads to long time processing of the miss yarn, which is an advantage of the high-speed loom. Hinder high productivity. In addition, if the miss yarn drawing process fails, the miss yarn will be woven into the woven cloth, leading to deterioration of the quality of the woven cloth.

That is, in the conventional weft processing apparatus, reliability, efficiency, etc. have not been sufficiently achieved.

Configuration of the Invention (Means for Solving the Problems) Therefore, in the present invention, the weft of the weft woven in the woven fabric is released immediately before the machine base is stopped by forming the open state of the warp, and in this state, the mechanical weft is released. By pulling out, a part of the weft is pulled out from the warp opening within the width of the woven fabric, and the pullout resistance releasing operation of the weft that is grasped and pulled out by another mechanical weft pulling means, and the warp thread are interlocked with the releasing operation. The weft detecting operation of the weft detecting means for detecting the weft outside the opening is performed at least once to release the high pull-out resistance at the initial stage of starting the pulling out of the weft from the inside of the warp and to check the pull-out state of the weft. did.

(Effect) That is, although the warp opening is formed, in the initial stage of pulling out the pulling resistance is large due to the gripping action of the upper and lower warps, the mechanical weft pulling means causes the weft to move from within the warp opening to within the width of the woven fabric. A part of is pulled out in a double state. Next, the weft is gripped by another mechanical weft drawing means, and a part of the weft is drawn out from the inside of the warp opening at an appropriate drawing speed that does not result in weft cutting. The two-step mechanical weft pull-out resistance releasing operation is performed once or plural times as needed, and the pull-out resistance releasing operation is performed until the weft is released from the gripping action of the upper and lower warps. By this weft pulling action, the weft yarn in the warp yarn opening is largely released from the gripping action by the warp yarn, and the pulling resistance thereafter is reduced. Therefore, the weft drawing after the drawing resistance releasing operation can be performed at a high speed without worrying about a cutting accident.

The weft detecting operation of the weft detecting means is performed at least once by the pair of weft drawing means in conjunction with the pulling resistance releasing operation, and the weft drawing state is confirmed. Therefore, it is possible to surely avoid leaving the weft yarn to be removed.

(Embodiment) An embodiment in which the present invention is embodied in a jet loom will be described below with reference to Figs.

As shown in FIGS. 1 and 4, a support bracket 1 is erected on a side frame (not shown) on the weft insertion side of the loom,
A support arm 2 is projectingly supported on the inner surface of the upper end portion in the weaving width direction of the loom. A drive motor 3 capable of forward and reverse rotation is fixed to the outer surface of the support arm 2, and a drive shaft 3a thereof is provided so as to penetrate the support arm 2 so as to penetrate therethrough. A weft processing device 4 and a bearing 5 are suspended and supported by the support arm 2, and a shaft 6 is rotatably supported by the weft processing device 4 and the bearing 5. A driven gear 7 is fixed to one end of the shaft 6 so as to mesh with a drive gear 8 fixed to the drive shaft 3a of the drive motor 3 so that the rotation of the drive motor 3 is transmitted to the shaft 6. Has become.

The frame 4a of the weft processing device 4 is suspended and supported by the support arm 2, and the shaft 6 is rotatably supported on the right side wall by penetrating the left side wall without making contact with the left side wall and at the right end side of the coaxial shaft 6. A gear 9 is fixed to the gear. A bifurcating suspension bracket 10 is suspended from the support arm 2 on the right wall side in the frame 4a, and a shaft 11 is rotatably supported between the bifurcated distal ends of the bracket 10. There is. axis
A gear 12 is fixed to the right end of 11 so as to mesh with the gear 9, and the rotation of the shaft 6 is transmitted to the shaft 11 via both gears 9 and 12.

A bifurcated arm 13 is rotatably supported on the shaft 11, and a timing pulley 14 is mounted on the shaft 11 within the arm 13.
Are fastened, and a shaft 15 is rotatably supported between the forked ends of the forked arm 13. A timing pulley 16 is fixedly attached to a shaft 15 between the tip ends of the bifurcated arm 13, and a timing belt 17 is hung between the pulley 16 and the timing pulley 14. The rotation of is transmitted to the shaft 15. Bifurcated arm
A balance weight 18 is fixed to the connecting base end portion of 13, and the weight 18 is brought into contact with a pair of stoppers (not shown) provided on the suspension bracket 10 to rotate the bifurcated arm 13. The range is regulated.

A clutch base 19 is fixed to the outer left side surface of the bifurcated arm 13 so that the shaft 15 penetrates through, and a brake lining 20 is fixed to the base 19. Shaft corresponding to clutch base 19
A clutch base 21 is fixed to 15 and a brake lining 22 is fixed inside the base 21. A nut 23 is screwed onto the right end of the shaft 15, and a pressing spring 24 is interposed between the nut 23 and the bifurcated arm 13. Therefore, the entire shaft 15 is biased to the right, and both brake linings are
20,22 are pressed together. An arm 25 is fixed to the left end of the shaft 15, and a claw piece 27 is attached to the tip of the arm 25 via a leaf spring 26.

A suspension bracket 28 is suspended from the support arm 2 on the left side of the suspension bracket 10 in the frame 4a, and a suction pipe 29 connected to a suction device (not shown) is suspended from the tip of the suspension bracket 28. ing.

The shaft 30 on the rear wall of the frame 4a has a pair of grip levers 31, 32.
Is rotatably supported, and both levers 31 and 32 extend along the rear wall of the frame 4a and then bend forward to extend, and the tips of both levers 31 and 32 are joined. It is a possible grip. A limit switch Ls is attached to the inner surface on the tip side of one of the gripping levers 31, and the detection needle n thereof is extended to a position where it does not interfere with the other gripping lever 32. An ON signal from the limit switch Ls is input to a control device (not shown) of the weft processing device 4, and the operation of the drive motor 3 and the air cylinder 34 is controlled based on this signal input.

An air cylinder 34 is rotatably mounted on the left side wall of the frame 4a, and the drive rod 34a of the air cylinder 34 is attached to one of the holding levers 3a.
Concatenated to 1. The other grip lever 32 is a tension spring 35.
Is urged to rotate in the counterclockwise direction about the shaft 30, and the rotation is restricted by the stopper 33. Then, by the action of the air cylinder 34, the grip lever 3
As shown in FIGS. 1 and 2, 1,1 and 32 always stand by at the position where the tip gripping portions of both gripping levers 31 and 32 are arranged near the suction port 29a of the suction pipe 29.

In the present embodiment, the miss yarn processing when a weft insertion error occurs is executed based on the miss yarn processing program. Therefore, the operation of processing the wrong yarn when a weft insertion error occurs will be described below.

When a weft insertion error occurs such that the tip of the weft thread injected from the weft insertion main nozzle 36 into the weft thread guide passage 37a formed by the modified reed 37 does not reach a predetermined position, a weft insertion error from a weft thread detector (not shown) occurs. The machine base is stopped based on the detection signal, but the miss yarn Y is woven into the woven cloth W as shown in FIG. 4 during the inertial operation until the machine base is stopped, and the cutter is operated every weft insertion. It is cut and separated from the main nozzle 36 for weft insertion by 38. The weft insertion of the weft that is about to be ejected from the weft insertion main nozzle 36 following the miss yarn Y is blocked on the weft measuring and storing device side.

The machine stand is stopped immediately before the beating, and after this stop, the machine stand is rotated about once and a half times. This reversing of the machine causes the deformed reed 37 to stop at the last retracted position shown in FIG.
Forms the maximum aperture. Therefore, the gripped state of the miss yarn Y by the warp yarns T1, T2, that is, the weaving state is released.

After the machine base is reversed, the drive rod 34a of the air cylinder 34 is operated in the retracted direction, and the gripping lever 31 is pivotally arranged in a substantially vertical state shown in FIGS. As the lever 31 rotates, the gripping lever 32 follows the rotation of the gripping lever 31 by the tension spring 35, but the gripping lever 32 comes into contact with the stopper 33 and is stopped at the position shown in FIGS. After operating the air cylinder 34,
The drive motor 3 is normally rotated based on the weft insertion error detection signal, and the bifurcated arm 13 is rotated clockwise about the shaft 11 in FIG. As a result, the claw piece 27 is rotated from the standby position shown by the solid line in FIG. 2 to the position shown by the solid line in FIG. 3, and the miss yarn Y located at the cloth fell W1 of the woven cloth W is hooked and separated by the claw piece 27. Receive.

When the state shown in FIG. 3 is reached, the balance weight 18 comes into contact with the one stopper (not shown), and the rotational driving force transmitted from the shaft 11 to the shaft 15 overcomes the frictional resistance between the brake linings 20 and 22. Therefore, the shaft 15 rotates with respect to the bifurcated arm 13, and the claw piece 27 passes through the gripping levers 31 and 32 from the inside of the warp thread along the path indicated by the arrow P in FIG. Is arranged to rotate. After the claw piece 27 moves along the path P in FIG. 3, the drive motor 3 is switched to the reverse rotation operation, and the bifurcated arm 13
Is rotated counterclockwise around the shaft 11. As a result, the claw piece 27 moves along the path indicated by the arrow Q in FIG. 3, but during this movement, the drive rod 34a of the air cylinder 34 is actuated in the protruding direction, and the tip grip portion of the grip lever 31 rotates clockwise. Rotate in the direction. If the hook yarn 27 fails to catch and separate the miss yarn Y, the miss yarn Y is not pulled out of the warp yarn opening. Therefore, the limit switch Ls is swept along with the rotation of the grip lever 31. The detection needle n is not turned ON, and the ON signal is not transmitted from the limit switch Ls. Based on this, the claw piece 27 moving along the path Q together with the bifurcated arm 13 causes the bifurcated arm 13 to come into contact with the other stopper (not shown) so that the path R shows an arrow R in FIG. 2 and returns to the standby position shown in FIG. Then, again, the miss thread hooking and separating operation by the claw piece 27 is performed.

When the miss thread hook separation by the nail piece 27 is successful,
As shown in FIG. 5, a part of the miss yarn Y is pulled out from the inside of the warp opening to the outside of the warp opening, and the detection needle n is swept up by the rotation of the gripping lever 31 from FIG. 5 to FIG. The miss yarn Y is pulled out and arranged. When the maximum yarn opening is formed and the miss yarn gripping state by the upper and lower warps T1 and T2 is released to some extent, but the miss yarn Y has a relatively large pull-out resistance, or the miss yarn Y is entangled with the warp yarn. In consideration of such a warp yarn cutting accident as described above, the rotation speed of the claw piece 27 is appropriately controlled, and the accidental cutting of the miss yarn due to the pulling out of the claw piece 27 does not occur.

After the claw piece 27 moves along the path P in FIG. 3, the drive motor 3 is switched to the reverse rotation operation, and the bifurcated arm 13 is rotated about the shaft 11 in the counterclockwise direction. As a result, the claw piece 27 moves along the path indicated by the arrow Q in FIG. 3, but during this movement, the drive rod 34a of the air cylinder 34 is actuated in the protruding direction, and the tip grip portion of the grip lever 31 rotates clockwise. Rotate in the direction. As a result, the detection needle n of the limit switch Ls comes into contact with the miss yarn Y drawn out of the warp yarn opening, the limit switch Ls is turned ON, and the tip grip portion of the grasping lever 31 hooks the miss yarn Y. As shown in the figure, it is held in pressure contact with the tip grip portion of the other grip lever 32. This ON signal is input to the control device (not shown), and the control device
Based on the ON signal, the following miss thread processing operations are selectively performed.

After the ON signal is transmitted from the limit switch Ls, the suction device (not shown) connected to the suction pipe 29 is activated. With the rotation of the gripping lever 31, the miss yarn Y held by pressure contact with the tip gripping portions of the levers 31 and 32 is held by the gripping levers 31 and 32.
Is further pulled out from the inside of the warp opening with the rotation of, the tip gripping portions of both gripping levers 31 and 32 are sucked into the suction port 29a of the suction pipe 29.
It is pivotally arranged to a nearby standby position. Then, while the claw piece 27 is moving along the path Q, the miss yarn Y is disengaged from the claw piece 27, and the bent tip portion of the miss yarn Y is sucked into the suction port 29a of the suction pipe 29. The pull-out speed of the mis-yarn Y by both gripping levers 31 and 32 is appropriately controlled as in the case of the claw piece 27, so that the accidental cutting of the mis-yarn Y is avoided.

When both gripping levers 31, 32 are pivotally arranged to the standby position shown in FIG. 7, the drive rod 34a of the air cylinder 34 is switched to the retracted direction, and the tip gripping portions of both gripping levers 31, 32 move to the 8th position. Separate again as shown. When the miss yarn Y is largely released from the grasping action of the upper and lower warp yarns T1, T2 by the pulling out by the both grasping levers 31, 32, both grasping levers 31, 3
The miss yarn Y released from the gripping action of 2 is pulled out and removed from the warp yarn opening at a high speed only by the suction action of the suction pipe 29. That is, in this embodiment, the mechanical pull-out means including the claw piece 27 and the two gripping levers 31 and 32 takes charge of the initial pull-out with a relatively large pull-out resistance, and the pull-out resistance of this mechanical pull-out means greatly reduces the pull-out resistance. The remaining missed yarn Y in the warp yarn opening is taken over by the suction means called the suction pipe 29, and the missed yarn Y is removed from the warp yarn opening in a short time.

The claw piece 27 moving along the path Q together with the bifurcated arm 13 is changed from the path Q to the path shown by an arrow R in FIG. 3 when the bifurcated arm 13 contacts the other stopper not shown. It moves and returns to the standby position shown in FIG. And
When the operation of the drive motor 3 is stopped, the operation of the suction device is stopped, and the drive rod 34a of the air cylinder 34 is operated in the projecting direction to return the grip lever 31 to the standby position in FIG. The miss thread detection by the limit switch Ls is performed again. Then, since the limit switch Ls does not operate if the suction removal of the miss yarn Y is completed, after the both gripping levers 31 and 32 have returned to the standby position, the machine base is reversed to the rotation position most suitable for restarting. The operation of the loom is started.

When the suction removal of the miss yarn Y is not completed due to the fact that the upper and lower warps T1 and T2 are not sufficiently released from the gripping action, the limit switch Ls is turned on to turn both gripping levers 31 and 32. The miss yarn grasping and pulling-out is performed again, and then the miss yarn detection, the miss yarn grasping and pulling out are repeated. When the number of missed yarns detected by the limit switch Ls reaches a preset number of times, the missed yarns detection operation, the missed yarn gripping operation and the pulling-out operation are stopped, and an alarm is issued. That is, for example, when the missed yarn Y is entangled with the warp so that it cannot be pulled out, the final missed yarn treatment is manually performed. In this way, by setting the limit switch Ls, the success or failure of pulling out the miss yarn Y is determined, so that the final removal process of the miss yarn Y is guaranteed,
The deterioration of the quality of the woven fabric due to the leftover of the miss yarn Y is avoided.

Of course, the present invention is not limited to the above-mentioned embodiment, and for example, in the above-mentioned embodiment, the limit switch Ls is installed on the side of the holding lever 32, or as shown in FIG. It is also possible to provide an embodiment in which recesses 31a and 32a are provided in the portion, and the detection needle n of the limit switch Ls is housed in both recesses 31a and 32a. In the case of FIG. 9, miss yarn Y
Is reliably tensioned in the both recesses 31a, 32a, so that the miss yarn detection by the limit switch Ls becomes more reliable.

Alternatively, in the above-described embodiment, the miss yarn Y is directly delivered from the claw piece 27 to the suction pipe 29, and then both gripping levers 31, 32 are
The pull-out resistance release operation by and the limit switch Ls are used to detect the yarn, and the limit switch Ls is omitted, and an optical system yarn detection sensor is installed in the suction pipe 29. An embodiment is possible in which the maximum number of pull-out resistance releasing operations such as thread gripping and pulling out is set in advance.

In addition, as shown in FIG. 10, the injection port of the main nozzle for weft insertion
The first suction pipe 39 is arranged near 36a, and
A structure in which a second suction pipe 40 is spaced apart from the pipe 39, a drive roller 41 is disposed between the suction pipes 39 and 40, and a driven roller 42 is disposed so as to be able to come into contact with and separate from the roller 41. Also in this, the present invention can be embodied. In this embodiment, a cutter (not shown) that is operated for each weft insertion is temporarily inoperative after a weft insertion error occurs, and the weft yarn following the miss yarn Y and the miss yarn Y are kept connected without being cut and separated. After the weft yarns following the miss yarn Y are sucked by the suction pipes 39, 40, both rollers 41, 42 are pressed against each other. However, by installing a limit switch Ls as shown in the figure, the yarn can be detected. After the missed yarn is pulled out by both rollers 41, 42 for a predetermined time, the missed yarn is moved only to the suction means,
When the rollers 41 and 42 are pressed against each other again, the result of the miss yarn removal processing by the suction means is confirmed. If the missed yarn Y is detected, the missed yarns are pulled out again by the rollers 41, 42. If the missed yarn Y is not detected, the rollers 41, 42 are immediately separated from each other, and the machine is restarted.

Further, the present invention can be applied to the case of removing the weft inserted just before the machine stand is stopped for a reason other than the occurrence of a weft insertion error.

As described in detail above, according to the weft processing method of the present invention,
By the operation of the weft drawing means for releasing a relatively large drawing resistance in the initial stage of drawing, which leads to a cutting accident due to the weft drawing, it is possible to reliably perform the release of the weft from the cloth fell and the detection and confirmation of the miss yarn processing state, This has the excellent effect of improving the reliability of the weft processing apparatus and enabling shortening of the weft drawing processing time.

Further, according to the present invention, a part of the weft is pulled out in a double state by grasping a part of the weft from the warp opening within the width of the woven cloth by the mechanical weft drawing means, so that the pulling means is arranged on the side of the woven cloth. As a result, the degree of freedom of the installation space for the pulling-out means can be improved, and the weft can be pulled out faster.

[Brief description of drawings]

1 to 8 show an embodiment embodying the present invention.
FIG. 4 is a front sectional view showing the weft processing device, FIG. 2 is a side sectional view of the weft processing device, FIG. 3 is a side sectional view for explaining the weft drawing action of the weft processing device, and FIG. 4 is installation of the weft processing device. Figure 5 is a schematic plan view showing the state, Figure 5 is a front sectional view showing the mis-thread pulling out by the claw piece, Figure 6 is a front sectional view showing the mis-thread holding state by a pair of holding levers, and Figure 7 is both holding levers. Fig. 8 is a front sectional view showing a missed yarn drawing state by the suction means, Fig. 8 is a front sectional view showing a missed yarn drawing state by the suction means, and Fig. 9 is a front sectional view showing another installation example of the limit switch.
The figure is a side sectional view showing another example of the present invention. Weft processing device 4, claw piece 2 that constitutes a mechanical drawing means
7. Grip levers 31 and 3 that constitute another mechanical pulling means
2, limit switch Ls as weft detection means, warp T1,
T2, Miss thread Y.

Claims (1)

[Claims] 1. A warp opening state is formed to cancel the weaving of the weft thread woven in the woven cloth immediately before the machine stand is stopped, and in this state, the mechanical weft drawing means is used to set the warp opening within the width of the woven cloth. A part of the weft yarn is pulled out from the weft yarn, and the weft yarn pullout resistance releasing operation for grasping and pulling out the weft yarn by another mechanical weft yarn pulling means and the weft yarn detecting means for detecting the weft yarn outside the warp opening in conjunction with the releasing operation Weft processing method in a shuttleless loom, wherein the weft detection operation is performed at least once.