JPS62215049A - Weft yarn treatment in shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a weft processing method in a shuttleless loom such as a jet loom, a rapier loom or a gripper loom.

(Conventional technology) Shuttleless looms such as jet looms can be expected to have much higher productivity than frame looms, and there has been a noticeable trend in the adoption of shuttleless looms in recent years, but the rate of weft insertion errors has decreased. It is a well-known fact that the cost of looms is higher than that of frame looms. In the event of a weft insertion error, the machine is stopped based on the weft insertion error detection signal from the weft detector, but in high-speed looms such as shuttleless looms, the machine is rotated more than once in order to prevent damage to each part. Since the machine is stopped after inertia operation, the weft threads that were inserted incorrectly (hereinafter referred to as "missed threads") are beaten and woven into the woven fabric just before the machine stops.

The erroneous threads, which become weaving flaws in the woven fabric, are removed from the woven fabric (an example of a weft processing device is disclosed in Japanese Patent Laid-Open No. 58-220856).

In this conventional example, a weft thread processing device equipped with one finger for separating misplaced threads woven into a woven fabric moves from a retracted position on a guide rail installed in the weaving width direction to dispose of predetermined misplaced threads. The finger is moved to the position, slides on the woven fabric, and enters the warp opening while rubbing the front of the fabric from outside the warp opening, thereby separating the missed yarns from the woven fabric into the warp opening. There is. The thus-separated mis-threads are passed from the fingers to a mis-thread pulling means which is inserted into the warp thread opening by scraping the warp threads from outside the warp thread opening.
A portion of the missed threads are pulled out from inside the warp opening to outside the warp opening together with a missed thread pulling means which is moved and arranged from inside the warp opening to outside the warp opening through between the warp threads. A portion of the missed yarns pulled out of the warp shedding is pressed and held between a pair of pull-out rollers, and by driving both pull-out rollers, all of the miss yarns are pulled out from inside the warp shedding. The erroneous yarn pulled out in this way is removed by suction by a suction pipe.

(Problems to be Solved by the Invention) The first requirement of the conventional device as described above is for the fingers to catch the misplaced threads driven into the woven fabric and reliably separate the misfied threads from the woven fabric. be. An extremely delicate movement of the finger is required in order to separate a single misplaced thread from the fabric, as in the case where the finger is designed with a roughly elliptical (i) L-shaped path to catch the misplaced thread. It is.

However, even when the warp threads are in the maximum open state, the grasping state of the misplaced threads by the warp threads is not sufficiently released.
Despite the fact that the approximately elliptical trajectory is created by a complicated configuration in which the intermediate portion of the finger, which is rotatably connected to the tip of a swingable arm centered on a single point, is moved circularly in one direction,
It is difficult to reliably avoid a situation in which a thread fails to be caught. If the separation of misplaced yarns fails, the misplaced yarns will be woven into the woven fabric, leading to a decrease in the quality of the woven fabric.

Even if the fingers succeed in separating the miss threads from the weaving front, the gripping action of the warp threads is still being applied to areas other than the part where the fingers separate the threads, so when pulling out the miss threads from inside the warp shedding to outside the warp shedding, A corresponding withdrawal resistance occurs.

Therefore, there is a high possibility that the erroneous yarn will be cut due to the pull-out resistance while the erroneous yarn is being pulled out. This also leads to mis-weaving of threads into the woven fabric, resulting in a decrease in the quality of the woven fabric.

Also, if a misplaced thread is cut midway inside the warp shedding, some of the cut misfired thread will remain inside the warp shedding, but this situation cannot be detected and the loom There is also the problem of restarting the machine and creating a weave.

Furthermore, in the above-mentioned weft yarn processing device, in order to perform error yarn processing regardless of the location of the error yarn in the weaving width direction, it is necessary to set a large number of separation processing positions in advance, which increases the processing time. It becomes difficult to shorten the length.

That is, in the automatic processing of misplaced yarns using the conventional weft processing device, sufficient reliability, efficiency, etc. have not been achieved.

Structure of the Invention (Means for Solving Problems) Therefore, the present invention is directed to a shuttleless loom equipped with a weft separating means for separating the weft woven into the woven fabric from the woven cloth immediately before the loom stops. At least either before the weft separation processing operation of the processing means or after the processing operation, scanning the vicinity of the fabric front with a spot light in a direction parallel to the weft threads,
The presence or absence of the weft between the upper and lower warps is confirmed by the spot light scanning type weft confirmation means, and the execution of the weft separation operation by the weft processing means is selected based on the confirmation result of the presence or absence of the weft by the weft confirmation means. did.

(Function) For example, after the weft separation operation of the weft processing means is activated by sending a weft insertion error detection signal, the spot light is scanned in a direction parallel to the error yarns to check for the presence or absence of error yarns near the fabric front between the upper and lower warp threads. If the result is that there is a mis-thread, the weft separation operation of the weft processing means is performed again. Therefore,
Separation of mis-threads from the woven fabric is successful with a high degree of success, and weaving of mis-threads into the fabric is avoided. If the result of the confirmation of the presence or absence of a mis-thread is that there is no mis-thread, restarting the machine is selected without performing the weft separation operation of the weft processing means.

Further, before the first mis-thread separation operation of the weft processing means after the weft insertion error detection signal is transmitted, the weft checking means may check the slots 1 to 1.
When optical scanning is carried out, the location of the misplaced yarn between the upper and lower warps is grasped, and based on this result, the misplaced yarn separation position of the weft separation means is set, and the misplaced yarn is removed at the set misplaced yarn separation position. A thread separation operation can be performed. Therefore, the erroneous yarn separation operation of the weft processing means can be suppressed to the necessary minimum, and the erroneous yarn removal operation can be performed efficiently and reliably. This idea of grasping the presence status of a misplaced yarn can be applied even after the weft separation operation, and the efficiency of misfiring yarn processing as described above can be improved.

That is, by confirming the presence of a mistake yarn before operating the weft processing means, the reliability or efficiency of the mistake yarn processing can be improved.

(Example) Hereinafter, an example in which the present invention is embodied in a jet loom will be described based on FIGS. 1 to 15.

As shown in FIG. 1, reference numeral 1 denotes a main nozzle for weft insertion that is attached to one end side of the slay 2 that swings back and forth, and the weft yarn Y passing through a weft length measuring and storage device (not shown) is used for weft insertion. The wefts are introduced into the main nozzle 1 and inserted into the weft guide holes 3a of the weft guide members 3 arranged in parallel on the sleigh 2.The wefts are ejected from the main nozzle 1 and inserted into the weft guide holes 3a in synchronization with the weft insertion timing.

If the weft yarn Y ejected from the main weft insertion nozzle 1 is inserted normally and reaches the end of the woven fabric W on the side opposite to the main nozzle, the weft yarn The weft thread escapes from the guide hole 3a through the slit 3b, and is beaten by the reed 4 and woven into the woven fabric W.

Then, the woven fabric W is cut by a cutter 5 provided near one main nozzle for inserting the weft, and the subsequent weaving operation is continued.

If a weft insertion error occurs such as the weft not reaching the end opposite to the main nozzle, the feeler F provided in the slit 3b of the weft guide member 3 corresponding to the same end will prevent the weft insertion error. Based on the weft insertion error detection signal from the feeler F, the operation of the machine drive motor M is stopped. The feeler F is composed of light emitting/receiving elements arranged opposite to each other across the slit 3b of the weft guide member 3, and emits a weft insertion error detection signal when the weft does not pass through the slit 3b during beating.

After the weft insertion error detection signal (also a machine stop signal) is issued, the machine rotates approximately once due to inertia and then stops. That is, when a weft insertion error occurs, a weft insertion error detection signal is generated while the slay 2 advances toward the woven fabric W from the most retracted position shown by the solid line in FIG. After being beaten against the cloth W, the sleigh 2 further moves back and forth and stops at the most retracted position.

A weft insertion prevention device 6 is disposed near the most retracted position of the weft insertion main nozzle 1, and prevents the weft yarn ejected from the weft insertion main nozzle l following the missed yarn Y° during the machine inertia operation. Weft insertion of Y1 is blocked, and the main nozzle for weft insertion 1
It is designed to be cut from the body and removed by suction. To explain the weft insertion blocking device 6, a blocking body 8 is provided at the tip of a drive shaft 7 which is operatively connected to a drive mechanism (not shown), and a blocking body 8 is provided at a weft blocking position on the weft path in front of the main nozzle 1 for weft insertion. It is designed to be able to reciprocate between the same position and a remote retracted position. The blocking body 8 is rotated from the retracted position to the blocking position when the weft insertion error detection signal is transmitted, and is configured to prevent the weft Y1 ejected from the weft insertion main nozzle l from being inserted during machine inertia operation. There is. When the blocking body 8 returns from the blocking position to the retracted position, the weft yarn Y1 is cut and separated from the weft insertion main nozzle 1 by a cutting mechanism (not shown).

A suction pipe 10 connected to a suction device 9 that is activated based on a weft insertion error detection signal is disposed near the blocking body 8, and a suction pipe 10 is provided above the proximal end of the suction pipe 10, which is bent and extended upward. A second suction pipe (not shown) is provided. A motor 11 is disposed on the side in the weft insertion direction between both suction pipes, and a drive roller 12 fixed to the drive shaft of the motor 11 is disposed near both suction pipes. . An air cylinder 13 is disposed on the side perpendicular to the weft insertion direction between both suction pipes 10, and a driven roller 14 is rotatable and driven between two forked arms 138 fixed to the drive rod of the air cylinder 13. It is supported so as to be able to come into contact with and separate from the roller 12. The motor 11 and the air cylinder 13 are operated based on a weft insertion error detection signal from the feeler F.

Note that the method of preventing weft insertion is not limited to the method using the above-mentioned blocker 8, but also by providing a locking device to prevent the weft stored in the weft length measuring device from being pulled out. A method of preventing entry can also be adopted.

As shown in FIG. 1.6, support brackets 15 and 16 are erected on both left and right side frames (not shown) of the machine stand, respectively. A pair of guide rails 17.18 are installed and supported in parallel in the longitudinal direction of the machine between both brackets 15.16, and a screw shaft 19 is disposed between both guide rails 17.18. One end side of the screw shaft 19 is the first,
In FIG. 6, it is operatively connected to a drive motor 20 that can be rotated forward and backward, which is attached to the left support bracket 15, and the other end is rotatably supported by the right support bracket 16.

A reflection plate 21 is rotatably supported between the support brackets 15 and 16 above the screw shaft 19, and a large-diameter driven gear 21a is fixed to one end of the reflection plate 21. A drive motor 22 is mounted on the outer surface of the support bracket 16, and its small diameter drive gear 22a is connected to a large diameter driven gear 21.
It is meshed with a. A rotation angle detector S1 is built into the drive motor 22, and the rotation angle of the drive motor 22 is detected. A motor 23 is disposed vertically in front of the reflector 21, and a reflector 24 having a regular octagonal cross section is attached to its drive shaft. Further, behind the reflector 21, a projector 25 for projecting a spot-shaped laser beam is arranged toward the reflector 24.
Spot light from the projector 25 is projected onto a reflective surface 24a on the outer peripheral surface of the reflector 24. Reflector 2
4 is rotated at high speed in the direction of the arrow P shown in FIG. 2 by the operation of the motor 23, and the spot light reflected from the reflecting surface 24a falls within the angular range between the arrows Ll and Ll° shown in FIG. sweep. Then, the reflected spot light L1 from the reflector 24 hits the reflector 21, and the reflector 21
The positional relationship between the projector 25, the reflector 24, and the reflector plate 21 is set so that the light is reflected downward. In this embodiment, the spot light L2 reflected from the reflection plate 21 is set to be as thin as the warp threads Tl and T2.

Although this embodiment uses a laser beam that has excellent directivity and is easy to focus into a smaller spot, it is of course possible to use other known light beams.

A weft processing device 26 is slidably supported between both guide rails 17, 18, and is slidably guided along both guide rails 17, 18 by rotation of the screw shaft 19. The weft processing device 26 is always
It is retracted to the outside of the woven fabric W on the drive motor 20 side, which is indicated by a chain line in the figure.

To explain the weft processing device 26, as shown in FIG.
The screw shaft 19 is screwed into both side walls. A motor 27 is attached to the center of the inner surface of the right side wall of the frame 26a, and its drive shaft 27a
The rotation of the shaft 2 is supported by a forked hanging bracket 28.
9 via gears 30.31. A shaft 33 is attached to the distal end of the bifurcated arm 32 which is rotatably supported on the shaft 29.
is rotatably supported, and a timing belt 34 is stretched between the shafts 29, 33 via timing pulleys 35, 36. A balance weight 37 is fixed to the connecting base end of the bifurcated arm 32, and when the balance weight 37 comes into contact with a pair of stoppers (not shown) provided on the hanging bracket 28, the bifurcated arm 32
The rotation range of 2 is restricted. The shaft 33 is a pressure spring 38
The brake lining 32a on the bifurcated arm 32 side and the brake lining 33a on the shaft 33 side are pressed against each other. Arm 3 is attached to the right end of shaft 33.
9 is fixed perpendicular to the shaft 34, and a claw piece 40 is attached to the arm 39 via a leaf spring 41.

An air cylinder 42 is supported on the right side of the hanging bracket 28 so as to be able to swing in the direction of the guide rails 17 and 18.
The crank arm 43 is rotated about the shaft 44 by the protrusion of the drive rod 42a of the air cylinder 42, and this rotation is transmitted to the support arm 48 via the shaft 44, the gear 45.degree. 46, and the shaft 47. A driven roller 49 is rotatably supported at the tip of the support arm 48 and can be connected to a driving roller 53 rotated by a motor 50 via gears 51 and 52.

As shown in FIG. 6, a suction vibrator 54 connected to a suction device (not shown) is vertically supported on the right side of the hanging bracket 29, and the suction port 54a of the pipe 54 is connected to the lower surface of the drive roller 53. placed on the side.

As shown in Fig. 1.8.9, a groove 2a is formed in the front upper surface of the sley 2 in the longitudinal direction of the sley 2, and a groove 2a is formed in the front upper surface of the sley 2.
An image sensor 55 for checking the weft is installed on the bottom of the slay 2.
are arranged in the longitudinal direction. Further, a rod-shaped convex lens 56 is fitted into the opening of the groove 2a.
The spot light incident from above in the direction of the front axis is focused on the image sensor 55. Note that a light receiving element may be used instead of the image sensor 55, and in this case, a biconvex lens may be used as the condensing lens instead of the rod-shaped convex lens 56. The image sensor 55 is a line sensor using a CCD (charge coupled device), and includes a large number of photosensitive pixels (
A photosensitive section (with a function of converting light energy into an electrical signal and temporarily accumulating the obtained signal charge) and a transfer electrode that transfers the accumulated signal charge in each photosensitive pixel sequentially from the transfer electrode corresponding to each photosensitive pixel. It consists of a transfer section that has the function of transferring the signal charge to the transfer electrode, and an output section that converts the signal charge transferred by the transfer section into a voltage signal.The charge signal generated at each photosensitive pixel is input in parallel to the transfer section. , charge signals input in parallel to the transfer section are input in series to the output section.

The aforementioned drive motor 20.22.23. The operation of the projector 25, weft processing device 26, image sensor 55, and machine drive motor M is controlled based on commands from the control device C shown in FIG. Machine rotation angle detection device S2, drive motor 22
The command is issued based on signals from the rotation angle detector S1 and the image sensor 55 inside. The control device C is composed of an input/output interface, a CPU (central processing unit), and a storage section that stores the error thread processing program shown in the flowchart of FIG. 15 and stores the detection results by the image sensor 55. ing.

In this embodiment, when a weft insertion error occurs, the error thread processing is carried out based on the error thread processing program shown in the flowchart of FIG. Therefore, the operation of mis-thread processing when a weft-insertion error occurs will be explained next.

When a weft insertion error occurs, the error yarn Y° is the weft front W of the woven fabric W.
1, a weft insertion error detection signal is issued from the feeler F, and based on the signal, the control device C issues an operation stop command to the machine drive motor M. As a result, the machine enters into inertial operation, and during this inertial operation, weft insertion of the weft yarn Yl, which is about to be ejected from the main weft insertion nozzle 1 following the miss yarn Y°, is blocked as shown in Figure 1. Weft insertion is prevented by the blocking body 8 of the device 6. .

After the weft insertion error detection signal is transmitted, the machine base rotates approximately once due to inertia, and the machine base stops when the slay 2 reaches the position indicated by the chain line as shown in FIG. After the machine is stopped, the control device C sends a reverse rotation operation command to the machine drive motor M, and the machine is reversed by a predetermined amount and then stopped. In this stopped state, as shown in FIG. 2.7, the convex lens 56 on the sleigh 2 is disposed below the woven fabric Wt. When the machine is stopped, a spot light is projected from the light projector 25 in response to a command from the control device C, and the image sensor 55 is activated. At the same time, the motors 23, 22 are activated, the reflector 24 rotates at high speed, and the reflector plate 21 rotates at a very low speed in the direction of arrow Q in FIG. As shown in FIG. 14, commands from the control device C to both motors 23, 22 are sent via variable frequency dividers 57, 5B and amplifiers 59, 60, and the frequency division ratios of variable frequency dividers 57, 58 are changed. By adjusting the rotational speeds of both motors 23 and 22, the settings can be changed as appropriate. The spot light is reflected toward the reflector 21 by one reflecting surface 24a of the reflector 24 rotating at high speed, and the spot light L1 reflected from the reflector 24
is reflected downward by the reflecting plate 21. The spot light L2 reflected from the reflection plate 21 rotating at a slow speed is the Orimae W.
The woven fabric W near l is scanned in the weaving width direction. When the reflection by the reflective surface 24a is completed, the reflection by the reflector 24 is transferred to the adjacent reflective surface 24a, and the spot light L2 scans a position slightly shifted from the scanning position toward the warp groups Tl and T2. Thereafter, this scanning in the weave width direction is performed at multiple positions in the warp direction in the vicinity of the weave W1 within the extension area of the angle θ shown in FIG.

As shown in FIG. 8, the spot light L2 that has passed through the vicinity of the woven fabric Wl is focused on the image sensor 55 by the convex lens 56 below the woven fabric W1, and is converted into a signal charge according to the amount of light in each photosensitive pixel of the image sensor 55. be done. Charge signals in each photosensitive pixel are taken out in series via the transfer section.

Examples of such exploration results are shown in Figure 12 (a), (b),
Shown in (c), (d), (e″).

In Fig. 12(a), the mistake yarn Y” woven into the woven fabric Wl
The vicinity of the tip of the spot light L2 is shown when the spot light L2 explores the vicinity of the weaving area where the arrow LL' in FIG. The control device C grasps the scanning position in the warp direction based on the detection signal from the rotation angle detector S1 built into the drive motor 22. The scanning of the spot light L2 is performed in the order of arrows p, q+', and s.

The graphs in FIGS. 12(b), (c), (d), and (e) represent changes in the position of the converted signal value of the spot light L2 received by the image sensor 55, and the signal indicated by A in the graph The range of the signal curve that reaches the level is the upper and lower warp groups Tl
, 72, and the range of the signal curve that reaches only the signal level indicated by B is the range of the missed yarn Y° and the woven fabric W.
This corresponds to the amount of light that has passed through the region where . The horizontal axes Xs, Xr, xq, and Xp of each graph represent the distance in the weave width direction at each spot light scanning position s, r, q, and p, and the result of the spot light scanning p on the textile front Wl is the 12th figure(
e), spot light scanning q is shown in FIG. 12(d), spot light scanning r is shown in FIG. 12(C), and spot light scanning S is shown in FIG. 12(b).

The signal curve shown in FIG. 12(b) is stored in advance in the control device C, and the signal curve of the exploration result is subtracted from the reference signal curve stored in advance in the control bag WC based on the exploration result by the image sensor 55. This is done by In the case of the search result of the spot light scanning p, a subtraction signal curve E1 shown in FIG. Based on this, the position of the spot light scan p in the warp direction is determined to be on the woven fabric Wl. In the case of the search result of spot light scanning q, a subtraction signal curve E2 shown in FIG. 12(d) is obtained, and the control device C uses this subtraction signal curve E2 and the rotation angle detector S1
Based on the detection signal from The subtraction signal curve E3 shown in FIG. In the case of the search result of spot light scanning S, since the subtraction signal becomes a zero signal, it is determined that there is a miss thread Y'
It is determined that there is no.

That is, the control device C understands that the misplaced yarn Y' is driven into the woven fabric Wl, and that the tip of the misplaced yarn Y° is denser than other parts. The result of this judgment based on the spot light search is stored in the control device C.

Since the presence of the incorrect thread Y" has been confirmed in the control device C as described above, the control device C sends a reverse operation command to the machine drive motor M, so that the slay 2 moves to the last retract as shown in FIGS. 3 and 9. Moved and placed in position.

Subsequently, a normal rotation operation command is sent from the control device C to the drive motor 20, and the screw shaft 19 is rotated in the direction of arrow R shown in FIG. As a result, the weft processing device 1226 moves from the retracted position shown in FIG. 1 toward the inside of the weaving width, and performs the weft separation operation at a plurality of predetermined positions within the weaving width. The predetermined position is selected based on the judgment result at each search position in the weaving width direction, and a miss yarn Y as shown in FIG. 1 is selected.

In the existence situation, the predetermined position within the existence region of the missed yarn Y° is selected.

The weft separation operation is performed by an operation command from the control device C to the motor 27. When the motor 27 is rotated forward, the gear 30 is rotated in the direction of arrow U in FIG. 9, and this rotation is transmitted to the shaft 29 via the gear 31. The rotation of the shaft 29 is transmitted to the shaft 33 via the timing belt 34, and the forked arm 32 side and the shaft 33 side are connected to the brake lining 32a.
, 33a, a friction torque exists between the bifurcated arm 32 and the shaft 33 according to the acting force of the pressing spring 38, and there is a relative rotation between the two. does not occur. Therefore, the bifurcated arm 32 and the shaft 33 rotate clockwise about the shaft 29 from the state shown in FIG. 9 as a unit. As the bifurcated arm 32 and the shaft 33 rotate, the tip of the claw piece 40 slides on the woven fabric W toward the front wl side. Then, as shown in FIG. 11(a), when the tip of the claw piece 40 reaches the woven fabric Wl, the claw piece 40
10 and 11(b), the tip of 0 engages with the missed yarn Y°, and the missed yarn Y' near the weft processing device 26 enters the warp opening from outside the warp opening as shown in FIGS. 10 and 11(b). It is separated from Orimae w1 like this.

When the claw piece 40 reaches the solid line position shown in FIG. 1O, the balance weight 37 comes into contact with the first stopper (not shown), and the rotation of the bifurcated arm 32 is prevented. At the same time, the motor 27 is operated in reverse, and the claw piece 40 returns to the retracted position shown in FIG. Then, the weft processing device 26 moves to the next weft separation operation position, and performs the same weft separation operation as described above at the same operation position.

When the weft separation operation of the weft yarn processing device 26 is performed at the chain line position shown in FIG. 3, the drive motor 22 is operated in reverse, and the weft yarn processing device 26 is moved to the chain line position shown in FIG. Moved and placed approximately in the center of the area.

This movement arrangement to the same position was selected based on the above-mentioned exploration result by spot light scanning. At this position, the weft processing device 26 performs a weft separation operation, and the claw pieces 40
As shown in Fig. 10 and Fig. 11(b), the mis-thread Y°
is separated from Orimae Wl. The forward rotation of the motor 27 continues, but since the bifurcated arm 32 stops at the position shown in FIG. The shaft 33 rotates relative to the forked arm 32 by overcoming the frictional torque between the two arms. As a result, the claw piece 40 is rotated clockwise around the shaft 33 from the solid line position shown in FIG.
It is rotated to a position outside the warp opening along the path CI shown in FIG. That is, a part of the miss yarn Y' that was engaged and held by the claw piece 40 is pulled out from inside the warp opening to outside the warp opening, and is drawn out and placed between the driving roller 53 and the driven roller 49.

When the misplaced yarn Y° is pulled out and placed between the driving roller 53 and the driven roller 49, the motor 27 is stopped and reversely operated, but at this time the air cylinder 42 is activated and the driven roller 49 moves as shown in FIG. It is rotated from the retracted position shown by the solid line to the chain line position where it comes into contact with the drive roller 53. Therefore, the erroneous thread Y° drawn out between the rollers 53, 49 is caught by the driven roller 49 and is held in pressure contact between the rollers 53, 49. At this point, a suction device and a motor 50 (not shown) connected to the suction pipe 54 are operated, and the miss thread Y° held in pressure contact between both rollers 53 and 49 is guided to the suction port 54a side of the suction pipe 54. , the miss thread Y' is suctioned into the suction pipe 54 as shown in FIG. 11(c). Therefore, as shown in FIG. 4, the remaining miss threads Y° within the warp shedding are sequentially drawn out from within the warp shedding to outside the warp shedding. Since this erroneous yarn pulling-out position is approximately in the center of the area where the erroneous yarn Y° exists, the pulling resistance is the least, and breakage of the erroneous yarn Y° due to the pulling resistance is avoided at a high rate.

Due to the reverse rotation of the motor 27, the bifurcated arm 32 and the claw piece 40 are integrally rotated along the path C2 shown in FIG. Then, when the balance weight 37 comes into contact with the second stopper, rotation of the bifurcated arm 32 is prevented, and the claw piece 40 side is connected to the brake lining 32a,
33a and returns to the retracted position along path C3 shown in FIG. Weft processing device 2
When the weft thread pulling-out processing operation of No. 6 is completed, the weft thread processing device 26 returns to the retracted position.

After the weft processing operation of the weft processing device 26 is completed, the slay 2 is placed in the position shown in FIG. 5 by normal rotation of the machine, and the same exploration as described above using the spot light L2 is performed again. Through this exploration, the upper and lower warp groups Tl.

'If the presence of a mistake yarn is not confirmed between the two, the restart of the machine is selected without performing the mistake yarn processing operation of the weft processing device 26.

If the weft processing device 26 fails to separate the erroneous yarns at a certain separation operation execution position, the erroneous yarns Y' near the same position are still subject to the gripping action by the upper and lower warp groups TI and T2. Even when the maximum opening of the upper and lower warp groups T1 and T2 is formed, the upper and lower warp groups T1. The gripping force of the missed thread Y° by T2 is considerable, and the misplaced thread Y° is held from the woven fabric W1.
When drawing directly out of the warp shedding, a corresponding amount of drawing resistance occurs. Therefore, when the weft yarn processing device 26 is pulling out the weft yarn, a mistake occurs due to the pulling resistance.
° cuts may occur, for example in Figures 5 and 13.
As shown in Figure (a), a misplaced yarn Y' may be left behind in the warp shedding. Missed thread Y left behind in the warp opening
The existence of .degree. is confirmed by re-examination of the spot light L2. The results of spot light exploration t are shown in Figure 13(e), the results of spot light exploration U are shown in Figure 13(d), the results of spot light exploration V are shown in Figure 13(c), and the results of spot light exploration W are shown in Figure 13(c). The results are shown in FIG. 13(b), and each signal curve D4. D5. The subtraction signal curve obtained by subtracting D6 is E4. E5. Indicated by E6. The control device C controls each subtraction signal curve E4°E5. Based on E6 and the detection signal from the rotation angle detector S1, the status of the missed yarn Y'' being left behind is grasped and stored.

The weft processing device 26 is operated again based on the search result, and the weft separation operation by the processing device 26 results in a miss yarn Y that is not separated from the woven fabric Wl in FIG.

done in parts. Subsequently, the weft thread processing device 26 performs a weft thread pulling operation at the optimal position for drawing out the missed yarn Y°, and after performing the weft thread drawing operation, the weft thread processing device 26
returns to the evacuation position. Then, the search using the spot light L2 is performed again, and based on the result of this search, either execution of the error yarn processing operation of the weft yarn processing device 26 or restarting of the machine is selected.

If the search result shows that the misplaced yarn has been removed from the warp shedding, the operation of the motors 22 and 23 is stopped, and the light projector 25 is turned off. Then, the machine drive motor M is reversed by a predetermined amount, and the machine is stopped at a rotational position most suitable for restarting. Thereafter, the machine drive motor M is rotated in the normal direction, and normal operation of the machine is resumed.

After the weft insertion error detection signal is transmitted, the weft processing device 26
Approximately 2 times using spot light before carrying out the weft processing operation of
According to the weft processing method of this embodiment, which performs dimensional scanning to confirm the misplaced yarn, the area where the misplaced yarn Y° exists within the weaving width is found,
The weft processing time can be shortened by selecting the position of the weft processing operation of the weft processing device 26 that will be performed subsequently. or,
By knowing the area where the erroneous thread Y° exists, it is possible to select the optimum erroneous thread pulling-out position with less pull-out resistance, increasing the probability that erroneous thread breakage due to the drawing-out resistance can be avoided. In other words, it is possible to improve the efficiency of automatic processing of misplaced threads.

If the weft processing device 26 performs the weft processing operation and then performs the spot light scanning to confirm the error yarn, the weft processing device 2
Upper and lower warp groups Tl and T2 are caused by failure in the weft processing of step 6 or by cutting the wrong yarn in the middle of the warp shedding.
Even if the wrong thread Y" is left behind, the upper and lower warp groups TI
, T2, the situation where the machine is restarted with the erroneous thread Y' left behind is reliably avoided. Therefore, the mistake thread Y1
The quality of the woven fabric W due to weaving is prevented from deteriorating, and the reliability of mis-thread processing is greatly improved.

Further, according to the present invention in which the vicinity of the woven fabric Wl is scanned with a spot light, the presence or absence of a misplaced yarn Y'' can be confirmed with high precision, and the reliability of misfiring yarn processing is further improved.

The present invention is, of course, not limited to the above-mentioned embodiments, and it is also possible to process misplaced threads according to the misplaced thread processing program shown in the flowchart of FIG. 16, for example. In the embodiment described above, after the weft insertion error detection signal is transmitted, the presence of a misplaced yarn is confirmed by spot light scanning before the weft processing device 26 is activated. However, in this embodiment, the weft processing device 26 is first activated. After that, it is confirmed whether or not the erroneous yarns have been reliably removed by this weft processing operation.

Weft processing is performed in case a misplaced yarn cannot be removed even if the weft processing device 26 repeats the misthread processing operation, for example, when a misplaced yarn is entangled with the warp threads so that it cannot be separated or pulled out. A program is executed to terminate the weft processing device 26 and the spot light scanning when the mis-thread processing operation by the device 26 is performed a predetermined number of times and the presence of a mis-thread between the upper and lower warp groups is confirmed.
It is also possible to incorporate it into the error thread processing program as described in 2 above to issue a warning that the error thread processing is not possible.

The embodiment shown in FIG. 17 is also possible as the installation position of the light receiving part such as the image sensor or the light receiving element.
The spot light L2 reflected by the upper reflecting plate 61 is focused through a convex lens 63 attached to a mounting bar 62 having a U-shaped cross section onto a light receiving section 64 formed of an image sensor or a light receiving element within the mounting bar 62. According to this embodiment, adverse effects caused by fluff, high-speed rocking of the slay 2, vibration, etc. can be avoided.

In each of the embodiments described above, spot light scanning is performed using a transmission method, but as shown in FIG. 18, a reflection method can also be used to detect missed threads. In this embodiment, a pair of rod lenses 66 and 67 are fitted into the upper surface of the sley 2 one after the other, and an optical fiber 68 is attached to the lower end surface of one of the rod lenses 66.
The light projection apertures 68a of the rod lenses 68a and 68a are arranged to face each other, and a light receiving element 69 is arranged on the lower end surface side of the other rod lens 67. A large number of such light emitting/receiving systems are arranged in parallel in the longitudinal direction of the ray 2, and a wavelength selective interference filter 70 is fitted into the opening of the groove accommodating the light emitting/receiving systems.

The light projected from the optical fiber 68 passes through the rod lens 66
The light is focused into a spot at the height of the woven fabric W, and the reflected light is sent to the light receiving element 69 by the rod lens 67.
The light is focused on. In order to search for a missed yarn Y'' using this light projection/reception system, the light projections from the optical fibers 68 of the multiple light projection/reception systems are sequentially shifted at high speed in the longitudinal direction of the slay 2, and the slay 2 is moved slightly in one direction. All you have to do is speed up,
As a result, a substantially two-dimensional scan of the vicinity of the textile cloth Wl is performed.

The adoption of the wavelength-selective interference filter 70 serves as a countermeasure against disturbance noise by selectively detecting only the necessary reflected light.
The reliability of checking for the presence of mis-threads is improved.

Note that the use of optical fibers is excellent for maintenance and for avoiding the negative effects of vibrations peculiar to looms, and can be used not only for the light projecting system but also for the light receiving system.

Furthermore, the present invention may be embodied in a case where a weft yarn processing device that performs misfiring yarn separation and misfiring yarn pulling-out operations as in the above-mentioned embodiment is fixedly disposed on the woven fabric, or a misfiring yarn and a following weft yarn are cut. When the misplaced yarn is connected to the weft insertion prevention device 6 shown in Fig. 1 and the misplaced yarn is pulled out from inside the warp shedding in the weft insertion direction and removed from the warp shedding, the main It is also possible to embody the invention.

Effects of the Invention As detailed above, before or after the operation of the weft processing means, a spot light scan is performed in the weaving width direction to confirm whether there is a misplaced yarn, and based on the confirmation result, the execution of the operation of the weft processing means is selected. According to the weft processing method of the present invention, it is possible to reliably avoid a situation in which misplaced threads are left behind between the upper and lower warp groups, and to prevent misplaced threads from being woven into the woven fabric, which would lead to deterioration in the quality of the woven fabric.

Furthermore, it is possible to improve the efficiency of automatic processing of mistaken yarns using the weft processing device.

[Brief explanation of drawings]

1-15 show an embodiment of the present invention, FIG. 1 is a plan view of the road body near the slay, and FIGS. 8 is a side view showing condensing light by a rod-shaped convex lens; FIG. 9 is a side sectional view of the weft processing device; FIG. Figures (a) and 11 (b) are side sectional views explaining mis-separated threads, and Figure 11 (C
) is a front view of the main part explaining how to pull out the wrong thread, and Figure 12 (
a) is a plan view showing the state in which the woven fabric near the tip of the missed yarn is explored; FIGS. 12(b), (c), (d),
(e) is a graph showing the signal curve obtained by the search in Fig. 12 (a), Fig. 13 (a) is a plan view showing the search after the weft processing operation by the weft processing device, and Figs. 13 (b) and (c). ), (
d) and (e) are graphs showing the signal curves from the exploration in Fig. 13(a), Fig. 14 is a block diagram, Fig. 15 is a flowchart showing the error thread processing program, and Fig. 16 is another error thread processing. A flowchart showing the program, FIG. 17 is a side sectional view showing another example of installing the light receiving section, and FIG. 18 is a side view showing the spot light reflection method. A reflector 21 and a reflector 24 constituting the weft confirmation means
, a floodlight 25, a weft processing device 26, an image sensor 55 constituting a weft confirmation means, a control device C1, a warp group T
I, T2, miss thread Y'.

Claims (1)

[Claims] 1. In a shuttleless loom equipped with a weft processing means for separating the weft threads woven into the woven fabric from the woven fabric immediately before the loom stops, at least one of the steps before or after the weft separation processing operation of the weft processing means Then, the vicinity of the weft is scanned with a spot light in a direction parallel to the weft, and the presence or absence of the weft between the upper and lower warps is confirmed by the spot light scanning type weft confirmation means, and the confirmation result of the presence or absence of the weft by the weft confirmation means is A weft processing method in a shuttleless loom, wherein execution of the weft separation operation of the weft processing means is selected based on.