JPS62162051A - 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] Purpose of the Invention (Field of Industrial Application) The present invention provides a method for treating weft threads woven into a woven fabric immediately before the loom stops in a shuttleless loom such as a jet loom, rapier loom, or gripper loom. It is related to.

(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 recent years to adopt shuttleless looms, 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.

A weft processing device for removing the erroneous threads, which become weave defects, from a woven fabric is disclosed in Japanese Patent Laid-Open No. 58-220856 and Japanese Patent Laid-Open No. 59-21757.

In Japanese Patent Application Laid-open No. 58-220856, a weft processing device equipped with one finger for separating mis-woven yarns woven into a woven fabric from the woven fabric is moved to a retracted position on a guide rail installed in the width direction of the woven fabric. After moving from the woven fabric to a predetermined mis-thread processing position, the fingers are moved into the warp opening while sliding on the woven fabric and rubbing the front of the fabric from outside the warp opening. It begins to separate into the opening (,
Nru.

The thus separated mis-threads are passed from the finger to the mis-thread pull-out means inserted into the warp shedding by scraping the warp from outside the warp shedding, and are moved from inside the warp shedding, passing between the warps, and out of the warp shedding. A part of the misplaced threads are pulled out from inside the warp thread opening to outside the warp thread opening together with the misfired thread pulling means.

A portion of the erroneous yarns pulled out of the warp shedding are held in pressure contact between a pair of pull-out rollers, and by driving both of the erroneous yarns, all of the erroneous yarns are pulled out from within the warp shedding. The erroneous yarn pulled out in this way is removed by suction by the suction means.

On the other hand, Japanese Patent Application Laid-Open No. 59-21757 discloses a weft cutting device which prevents weft insertion during machine inertia operation, introduces and grips a weft blocking weft between a pair of pressing rollers, and which is operated each time weft insertion is performed. There is a method in which the cutting function of the machine is temporarily stopped to maintain the connection between the missed thread and the following weft thread without cutting it, and the pressure roller is rotated to pull out the missed thread from within the warp opening. Disclosed.

(Problems to be Solved by the Invention) A problem in such a weft processing method is the failure to pull out the wrong yarns that are pulled out from within the warp opening, that is, the accidental breakage of the wrong yarns during drawing. Even though the state of grip by the warp threads has been released to some extent, there is a considerable risk of breakage if the mis-threads are given a certain amount of resistance when being pulled out from the warp opening and are pulled out at a high speed.

Therefore, it is generally considered to maintain the drawing speed of the misplaced yarn at a low speed to suppress the pull-out resistance and prevent misfiring yarn breakage accidents, but this leads to long-term processing of the misplaced yarn, which is an advantage of high-speed looms. This hinders high productivity.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, the warp threads are formed in an open state to release the weft threads woven into the woven fabric immediately before the machine stops, and in this state, the mechanical weft threads are opened. A part of the weft yarn is pulled out from inside the warp opening by the pulling means and delivered to the suction means, and the weft pulling action from inside the warp opening is transferred from the mechanical weft pulling means to the suction means, thereby removing the remaining part of the weft inside the warp opening. Mistaken threads are pulled out and removed only by suction means.

(Function) That is, in the early stage of drawing when the drawing resistance is large, a part of the weft is drawn out from within the warp opening by a mechanical drawing means such as a drawing roller at an appropriate drawing speed that does not cause weft breakage, and this drawn weft is handed over to suction means.

Due to this weft pulling action, the weft threads in the warp opening are largely released from the gripping action of the warp threads, and the subsequent drawing resistance is reduced. After the drawing resistance decreases, that is, after a part of the weft is pulled out by the mechanical drawing means, the action of drawing out the weft in the warp opening is transferred to the suction means, and the remaining weft in the warp opening is suctioned and removed by the suction means. be done.

Since the weft thread withdrawal by the suction means is performed at a much higher speed than the mechanical withdrawal means, the weft processing time in the present invention in which the weft thread withdrawal action is transferred from the mechanical withdrawal means to the suction means is limited to the entire weft thread withdrawal period. This is significantly shortened compared to conventional weft processing methods involving mechanical withdrawal means.

(Example) Hereinafter, an example in which the present invention is embodied in a jet loom will be described based on FIGS. 1 to 8.

As shown in Figure 1.4, a support bracket 1 is erected on the side frame (path shown) on the weft insertion side of the loom, and a support arm 2 is installed on the inner surface of the upper end of the loom in the weaving width direction of the loom. It is supported by a protrusion. A drive motor 3 capable of forward and reverse rotation is fixed to the outer surface of the support arm 2, and its drive shaft 3
A is provided to protrude through the inside of the support arm 2. A weft processing device 4 and a bearing 5 are suspended from 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, and the rotation of the drive motor 3 is transmitted to the shaft 6. It looks like this.

The frame 4a of the weft processing device 4 is suspended and supported by the support arm 2, and the shaft 6 passes through the left side wall without contacting it and is rotatably supported on the right side wall. A gear 9 is fixed to. frame 4
There is a trident-shaped hanging bracket 10 on the right side wall inside a.
is suspended from the support arm 2, and the same bracket 10
A shaft 11 is rotatably supported between the forked tip portions of the shaft. A gear 12 is fixed to the right end of the shaft 11 so as to mesh with the gear 9, and the rotation of the shaft 6 is caused by the rotation of both gears 9.1.
2 to the shaft 11.

A bifurcated arm 13 is rotatably supported on the shaft 11, and a timing pulley 14 is fixed to the shaft 11 within the arm 13. A shaft 15 is rotatably supported between the parts. A timing pulley 16 is fixed to the shaft 15 between the tips of the three-pronged arm 13, and a timing belt 1 is connected between the pulley 16 and the timing boot IJ14.
7 is hung so that the rotation of the shaft 11 is transmitted to the shaft 15. A balance weight 18 is fixed to the connecting base end of the bifurcated arm 13, and when the weight 18 comes into contact with a pair of stoppers (not shown) provided on the hanging bracket 1o, the bifurcated arm 13 rotation range is regulated.

A clutch stand 19 is fixed to the left outer surface of the bifurcated arm 13 so that the shaft 15 passes through it, and a brake lining 2o is fixed to the clutch 19. clutch stand 19
Correspondingly, a clutch stand 21 is fixed to the shaft 15, and a brake lining 22 is fixed to the inner side of the clutch 21. A nut 23 is screwed onto the right end of the shaft 15, and a pressure spring 24 is interposed between the nut 23 and the forked arm 13. Therefore, the entire shaft 15 is urged to the right, and both brake linings 20.degree. 22 are pressed against each other. An arm 25 is fixed to the left end of the shaft 15, and a claw piece 2 is attached to the tip of the arm 25 via a handling spring 26.
7 is installed.

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

A pair of gripping levers 3 are attached to the shaft 30 on the rear wall of the frame 4a.
1.32 is rotatably supported, both levers 31.32 extend along the rear wall of the frame 4a, and then are bent and extended forward, and the tips of both levers 31.32 The parts are a grip part that can be joined. An air cylinder 34 is rotatably mounted on the left side wall of the frame 4a.
The drive rod 34a is connected to one gripping lever 31. The other gripping lever 32 is urged to rotate counterclockwise around the shaft 30 by a tension spring 35, and its rotation is restricted by a stopper 33. Then, the gripping lever 3 is moved by the action of the air cylinder 34.
1.32 is the re-grip lever 31 as shown in FIG. 1.2.
．． 32 is always on standby at a position disposed near the suction port 29a of the suction pipe 29.

Now, in this embodiment, when a weft insertion error occurs, the error thread processing is performed based on the error thread processing program. Therefore, the action of handling the misplaced yarn when a weft insertion error occurs will be explained next.

If a weft insertion error occurs such that the tip of the weft ejected from the weft insertion main nozzle 36 into the weft guide passage 37a formed by the deformed reed 37 does not reach a predetermined position, a weft insertion error from a weft detector (not shown) occurs. The machine is stopped based on the detection signal, but during the inertia operation until the machine stops, the erroneous thread y is woven into the woven fabric W as shown in Fig. 4, and the cutter is operated every time weft is inserted. 38, it is cut and separated from the main nozzle 36 for weft insertion.

Weft insertion of the weft yarn that is about to be ejected from the weft insertion main nozzle 36 following the misplaced yarn Y is blocked on the weft length measuring and storage device side.

The machine is stopped just before beating the reed, and after this stop, the machine is reversed about one and a half times. Due to this reverse rotation of the machine, the deformed flow 37 stops at the most retracted position shown in FIG. 2, and the warp thread TI
, T2 form the maximum aperture.

Therefore, the gripping state of the misplaced yarn Y by the warp threads Tl and T2, that is, the weaving state, is released.

After the machine is reversed, the drive rod 34a of the air cylinder 34 is operated in the retracting direction, and the gripping lever 31 is rotated to the substantially vertical position shown in FIG. 3.5. As the lever 31 rotates, the gripping lever 32 is moved by the tension spring 35.
The gripping lever 32 follows the rotation of the stopper 33.
3.5 and is regulated and stopped at the position shown in Fig. 3.5. After the air cylinder 34 is activated, the drive motor 3 is rotated in the normal direction based on the weft insertion error detection signal, and the forked 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. Ru.

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 forked arm 13, and the claw piece 27 catches the missed yarn Y along the path shown by the arrow P in FIG. The levers 31 and 32 are rotated to the outside of the warp shedding, and a portion of the miss thread Y is pulled out from inside the warp shedding to the outside of the warp shedding, as shown in FIG. Forming the maximum warp opening, upper and lower warps T1. In consideration of the accidental cutting of the misplaced thread Y which exhibits relatively large pulling resistance even though the state of grasping the misplaced thread due to T2 has been released to some extent, the claw piece 27
The rotational speed of is appropriately suppressed, and no accidental cutting of the erroneous thread Y due to pulling out of the claw piece 27 occurs.

After the claw piece 27 moves along the path P shown in FIG. be moved. This causes the claw piece 27 to move as shown by the arrow Q in FIG.
During this movement, the driving iron 34a of the air cylinder 34 is activated in the projecting direction, and the tip gripping portion of the gripping lever 31 is rotated clockwise and pulled out of the warp opening. Then, as shown in FIG. 6, the erroneous thread Y is caught and clamped in pressure contact with the tip gripping portion of the other gripping lever 32. The missed yarn Y, which is pressed and clamped by the tip gripping portions of both levers 31 and 32, is further pulled out from inside the warp opening as the regripping levers 31 and 32 rotate, and the regripping lever 31
．． 32 is rotated to the standby position near the suction port 29a of the suction pipe 29, the upper and lower warp threads TI
.

The misplaced yarn Y in the warp opening, which had been subjected to the gripping action of T2, is largely freed from the gripping action of the warp threads TI and T2. Then, while the claw piece 27 is moving along the path Q, the misplaced thread Y is inserted into the claw piece 2.
7, and the bent tip of the miss thread Y is sucked into the suction port 29a of the suction pipe 29. Regripping lever 31.32
Similarly to the case of the claw piece 27, the speed at which the erroneous yarn Y is pulled out is appropriately suppressed, thereby avoiding an accident in which the erroneous yarn Y is cut.

When the re-gripping lever 31.32 is rotated to the standby position shown in FIG. Separate again as shown. The missed yarn Y released from the gripping action of the re-gripping levers 31 and 32 is in contact with the tip gripping portion of the gripping lever 32 and is guided and sucked into the suction port 29a of the suction pipe 29, and the upper and lower warp yarns Tl, T2
The misplaced yarn Y within the warp shedding, which has been largely freed from the gripping action of the warp shedding, is pulled out and removed from the warp shedding at a high speed only by the suction action. That is, in this embodiment, the mechanical pulling means of the claw piece 27 and the re-grasping levers 31 and 32 are responsible for the initial stage of pulling out, where the pulling resistance is relatively large.
The pulling out of the remaining misplaced yarns Y in the warp opening, whose pulling resistance has been significantly reduced by the pulling action of this mechanical pulling-out means, is carried over to a suction means called the suction pipe 29, which removes the misplaced yarns Y from within the warp opening. Processing is done in a short time.

The claw piece 27, which is moving along the path Q together with the forked arm 13, moves from the path Q to the path indicated by the arrow R in FIG. and returns to the standby position shown in FIG. Then, 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 further actuated in the projecting direction, causing the re-gripping lever 3 to move.
1.32 returns to the standby position shown in FIG.

The loom is then reversed to the most suitable rotational position for restarting, and the loom is started.

In this embodiment, if the stopper 33 that hooks one end of the tension spring 35 is configured to be adjustable in the vertical direction, the re-gripping lever 31.
The gripping force between 32 can be adjusted as appropriate. In other words, if the misplaced thread Y is entangled with the warp threads and cannot be pulled out, the re-gripping lever 3 that presses and grasps the misplaced thread Y
The misplaced thread Y slides between the tip gripping portions 1 and 32, and an accident of cutting the misplaced thread Y is avoided. Instead of such a cutting avoidance means, a pull-out resistance detector such as an electric strain meter may be installed to stop the pull-out operation when the pull-out resistance becomes high.

Further, in this embodiment, the operation of pulling out the wrong yarn by the re-gripping levers 31 and 32 may be performed a plurality of times until the gripping of the wrong yarn by the upper and lower warp threads TI and T2 is sufficiently released.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, instead of the gripping lever 32, a drive roller is arranged near the suction port 29a of the suction pipe 29, and the drive roller is driven by the tip of the gripping lever 31. Embodiments constituting mechanical withdrawal means equipped with rollers are also possible,
According to this mechanical pull-out means, by rotating the drive roller, the initial erroneous thread is pulled out and the erroneous thread is delivered to the suction pipe, and after driving for a predetermined time, the erroneous thread is pulled out by detecting the pulling torque. Detect the condition and
If the driven roller is separated when the torque has decreased, it is possible to shorten the time required to process the mis-thread as in the previous embodiment.

Alternatively, as shown in FIG. 9, a first suction pipe 39 is arranged near the injection port 36a of the main nozzle for weft insertion, and a second suction pipe 4 is placed next to the pipe 39.
The present invention can also be embodied in a configuration in which the drive roller 41 is arranged between the re-suction pipes 39 and 40, and the driven roller 42 is arranged so as to be able to come into contact with and separate from the roller 41. . In this embodiment, a cutter (not shown) that is activated every time weft insertion is temporarily deactivated after a weft insertion error occurs, and the weft yarn following the erroneous yarn Y is kept connected to the erroneous yarn Y without being cut and separated. The weft yarn following the missed yarn Y is sucked into the suction pipes 39 and 40. And both rollers 41
, 42 and wait for a predetermined time for the missed thread Y to be pulled out, both rollers 41 and 42 are separated and the subsequent missed thread Y is removed.
If the drawer is moved to the suction means, the mistaken thread removal process can be carried out in a short time as in the previous embodiment.

In addition, in the present invention, a sensor is installed as appropriate to check whether all the miss threads have been pulled out by the suction means, and based on the result of this check, the mechanical pulling means is selected to carry out the pulling operation again, and the weaving width is adjusted. It is also possible to apply the present invention to a weft processing device that separates misplaced yarns from the fabric front at a number of positions in the direction.

Furthermore, the present invention can be applied to the case where weft yarns inserted immediately before the machine is stopped due to reasons other than the occurrence of a weft insertion error are removed.

Effects of the Invention As detailed above, according to the weft processing method of the present invention,
This has the excellent effect of improving the operating efficiency of the loom by performing the weft removal process in a short time while avoiding cutting accidents caused by pulling out the weft from the warp shedding.

[Brief explanation of drawings]

1 to 8 show an embodiment embodying the present invention.
The figure 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 explaining the weft pulling action of the weft processing device, and Fig. 4 is the installation of the weft processing device. A plan view of the road body showing the state, FIG. 5 is a front sectional view showing the incorrect thread being pulled out by the claw piece, FIG. 6 is a front sectional view showing the incorrect thread being held by a pair of gripping levers, and FIG. 7 is the re-gripping lever. FIG. 8 is a front sectional view showing a state in which the thread is pulled out incorrectly by the suction means, FIG. 9 is a side sectional view showing another example of the present invention.

Claims (1)

[Claims] 1. Forming an open state of the warp threads and releasing the weft threads woven into the fabric immediately before the machine stops, and in this state, a part of the weft threads are pulled out from within the warp opening by the mechanical weft drawing means, and the suction means A weft processing method in a shuttleless loom, wherein the weft pulling action from within the warp opening is transferred from the mechanical weft pulling means to the suction means.