JPH07113181B2 - Fluid jet loom with miss yarn pulling and removing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention has a yarn end catching device for catching the yarn end of a weft yarn which has been weft-inserted by using a catch yarn arranged on the opposite weft insertion side of a warp row. The present invention also relates to a fluid jet loom having a miss yarn pulling and removing device for pulling and removing the miss yarn when a weft insertion error occurs during weaving.

[Conventional technology]

For example, as disclosed in Japanese Patent Publication No. 39-29654, the yarn end catching device has a plurality of threads of catching yarns arranged on the reverse weft insertion side (opposite to the weft insertion nozzle) of the warp row on the cloth fell side. After passing through the twister arranged in one direction, pulling to the front of the loom (woven fabric side), while applying the opening and closing movement to the captured yarn between the twister and the heddle, at approximately the same timing as the warp row. When the weft thread ejected from the weft insertion nozzle passes through the opening of the warp thread and passes through the opening of the capture thread, weft insertion is completed, and then the capture thread is closed together with the warp and the above weft insertion is performed. This is captured by weaving the yarn end of the weft and twisting it further to pick up the yarn end.

Further, the above-mentioned miss yarn traction removing device is disclosed in, for example, Japanese Patent Laid-Open No. 58-197351
It is used in a miss yarn removal processing device as disclosed in Japanese Patent Publication No. This miss yarn removal processing device abnormally stops the loom when a weft insertion error occurs during weaving, and then reverses the miss yarn to the vicinity of the maximum opening phase angle of the warp just before the miss yarn is beaten. Is exposed to the front of the weaving machine, the exposed missed yarn is pulled out by a traction device and removed, and then the main shaft of the loom is restarted by adjusting it to a predetermined phase angle. To perform.

Further, the applicant of the present application has previously proposed the following miss yarn removal processing device (Japanese Patent Application No. 60-141570). In the case of the abnormal stop due to a weft insertion error, this device stops without cutting the weft yarn connected to the cloth fell from the fluid injection nozzle, then exposes the miss yarn to the cloth fell, and then two picks from the weft insertion nozzle. Inject weft yarns that exceed. Therefore, the weft yarn is inverted from the cloth fell while being connected to the miss yarn, and is formed into a U shape between the weft yarn and the fluid injection nozzle and inserted into the openings of the warp yarn and the catch yarn. The U-shaped top is pulled by a miss yarn pulling / removing device arranged further on the opposite weft insertion side of the catch yarn. Due to this traction, the miss yarn driven into the cloth fell is peeled off from the above-mentioned reversal portion and is removed, and as a result, the above-mentioned inserted weft yarn is stretched straight between the weft insertion nozzle and the miss yarn pulling device. To do. If the spread weft yarn is cut near the weft insertion nozzle, the inserted weft yarn is pulled along with the miss yarn and is removed. This device has an excellent function of peeling the miss yarn by pulling it from the reversing portion.

[Problems to be solved by the invention]

By the way, in a fluid jet loom equipped with such a yarn end catching device and a miss yarn pulling and removing device, the weaving machine is abnormal even though weft insertion is normally performed due to a detection error of the weft yarn detector. If a so-called idle stop, which is a stop, occurs, there is a problem that the catching yarn is cut after restarting.

When the idle stop occurs, the miss yarn removing processing device automatically operates to remove the weft yarn (pseudo miss yarn), but at this time, the pseudo miss yarn is properly wefted. The yarn end is woven into the catching yarn and is enthusiastic, which makes it difficult to cause separation. Therefore, the pseudo miss yarn may be connected to the miss yarn pulling and removing device while being held by the catching yarn. When the loom is restarted in this state, the weft yarn is removed by the twisting motion of the twisting device. It is pulled out from the yarn and wound around the catching yarn to form a lump, and if the catching yarn is pulled until the lump cannot pass through the twister, it will eventually break.

If the captured yarn is cut, the loom cannot be automatically repaired, so the loom must be stopped until an operator arrives, which reduces operating efficiency.

Therefore, an object of the present invention is to prevent the above-mentioned lumps from being formed.

[Means for solving problems]

The means of the present invention which has solved the above-mentioned problems is to dispose a yarn cutter which cuts the weft yarn connected to the miss yarn pulling and removing device from the yarn end catching device.

[Action]

According to the above-mentioned means, when the weft is connected to the miss yarn pulling and removing device while being held by the yarn end catching device as described above, the yarn cutter arranged in the yarn path cuts it. The weft thread is not further withdrawn from the miss thread pulling and removing device, thus avoiding the situation of lumping.

〔Example〕

An example of a water jet loom equipped with the miss yarn removing device and an embodiment of the present invention applied to the loom will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral Y is a warp thread, W is a weft thread, C is a woven cloth,
F indicates the cloth fell. The main shaft 1 of the loom is rotationally driven by the main motor 2, and the electromagnetic brake 3 attached to the main shaft 1 is opened by a start command of the main motor 2 and is braked by a stop command. The main shaft 1 reciprocally drives the heddle 6 and the reed 7, and also drives various rotary elements described later.

Reference numeral 10 is a water supply passage for wetting water, and the constant water level tank 11 is a water pipe.
Accepts tap water from 14 and its float valve 12
Thus, the wetting water is fed to the feeding pipe 16 through the check valve 15 while maintaining the predetermined water level. A plunger type weft insertion pump 17 interposed in the feed pipe 16 is driven by a rotary cam 18 to perform a suction stroke, and a built-in spring performs a discharge stroke according to the weft insertion period. This discharged water is fed to a weft insertion nozzle (water injection nozzle) 20 fixed to the base of the loom.
Further, the feed pipe line 16 is connected to the bottom portion of the sub tank 21 via the check valve 15, and the upper portion of the tank 21 is connected to the pressure air source 8 via a three-way solenoid valve 22 and a regulator 23 which are always open to the atmosphere. Let Therefore, the wetting water is always stored in the sub tank 21 at the same water level as in the constant water tank 11, and the storage amount is set to a predetermined value by adjusting the vertical position of the tank.

Further, a normally closed relief valve 24 is connected downstream of the weft insertion pump 17 to the water supply passage 10, and a normally open shutoff valve 25 is further downstream thereof.
Intervene. These valves 24 and 25 are solenoid valves that operate in pairs, and when an operation signal is sent, the shutoff valve 25 closes and at the same time the relief valve 24 opens.

Reference numeral 30 is a rotary drum type weft measuring and storing device. The drum 31 of the device 30 is driven at a predetermined peripheral speed from the main shaft 1 via a permanent electromagnetic clutch 32 and a belt transmission means 33, and a winding motor 34 to an electromagnetic clutch 35.
Can also be driven via. The electromagnetic clutch 35 is always open and is engaged at the same time as sending an operation command to the winding motor 34. Then, the weft W from the yarn feeder 36 is pinched by the drum 31 and the pressing roller 37 to measure the weft at the same speed as the peripheral speed of the drum, while measuring the length of the air blown from the blower 38. Is introduced into an annular cover 39 having a groove-shaped cross section surrounding the drum and a swirling airflow is generated in the cover in the same direction as the rotation direction of the drum, and the weft yarn fed out is wound around the drum and stored. This weft is a thread guide
After passing through 40 and the gripper 41, it is inserted into the weft insertion nozzle 20. The gripper 41 is reciprocally driven by the rotary cam 42 to release the weft during the weft insertion period.

Reference numeral 50 denotes a yarn end catching device which pulls several catching yarns 51 drawn out from a plurality of yarn feeders (not shown) through the heddle 6 and then slightly to the side of the weft insertion side of the cloth fell F. In the front position, the twisting device 52 which is rotatably supported is inserted and focused, whereby the catching yarn 51 is given an opening / closing motion. Further, the twisting device 52 is rotationally driven to twist the captured yarn bundle in the above-mentioned insertion portion while turning it by the guide rotor 53, and then the pulling device.
Tow it by 54 and remove it outside the aircraft. This pulling speed is set to be slightly higher than the traveling speed of the woven cloth C.

Reference numeral 45 is a weft yarn separating cutter, which cuts and separates the weft yarn connecting from the cloth fell F to the weft insertion nozzle 20 immediately after beating. A cut prevention means 46 is attached to the cutting cutter to prevent the above cutting movement. 47 is a yarn end cutter, which cuts the yarn end of the weft inserted after several picks of weft insertion. 48 is warp Y
It is an electrode type weft yarn detector that is arranged between the catching yarn 51 and the catching yarn 51 and is attached to the front surface of the reed 7.

Reference numeral 60 is a miss yarn pulling / removing device, which is an L-shaped suction head 61.
One side is opened to face the weft insertion nozzle 20, the other side is connected to the discharge pipe 63 via the filter 62, and the air nozzle 64 is attached toward the discharge pipe 63. The air nozzle 64 is connected to the pressurized air source 8 via a normally closed solenoid valve 65 and a regulator 66.

Reference numeral 70 is a thread cutter. The yarn cutter 70 of this example is of a razor type, and when the weft yarn is stretched from the twister 52 or its vicinity to the suction head 61 and becomes tense, the cutting edge of the loom can be exposed to the yarn path Wa. It is fixed to the machine base.

The embodiment is configured as described above. Next, the operation will be described.

The operation phase angle (rotational phase angle of the main shaft 1) of the loom is the maximum opening time of the warp Y when the beating time is calculated as 0 °.
180 °, the detection time of the weft detector 48 is about 330 ° Separation cutter 45
It is assumed that the weft cutting timing is set to 10 °. Further, during the miss yarn removing process, a control device (not shown) of the loom receives a signal from the phase angle sensor 5 such as an encoder provided on the spindle 1 to give an operation instruction corresponding to a corresponding time, as described later. Do it.

When the weaving machine is operating normally, when the weft insertion timing approaches in the retreat stroke of the reed 7, the weft insertion pump 17 moves to the discharge stroke, water injection from the weft insertion nozzle 20 starts, and the weft insertion timing comes. At the same time, the gripper 41 releases the weft W. As a result, one pick's worth of weft yarn stored in the drum 31 of the weft length measuring and storing device 30 is ejected from the weft insertion nozzle 20 and passes through the openings of the warp yarn Y and the catch yarn 51. Gripper here
41 grips the weft and brakes, and at the same time as or slightly before this, the discharge stroke of the weft insertion pump 17 ends, and the weft insertion ends. In this process, the reed 7 passes through the warp maximum opening phase of 180 ° and moves forward, and at 330 ° on the way, the weft detector 48 contacts the weft and detects the presence of the yarn. The reed 7 continues to advance and drives the weft yarn into the cloth fell F at 0 °, and immediately after that, at 10 °, the cutting cutter 45 operates to separate the weft yarn connected to the weft insertion nozzle 20. .

On the other hand, the catching yarn 51 is closed slightly prior to beating, and weaves in the yarn end of the weft yarn that has been wefted in, and further tightly captures this yarn end by the twisting motion, and as described above, it is faster than the traveling speed of the woven cloth C. It is towed at a high speed. As a result, tension is applied to the weft thread and the thread end cutter 47
Operates to separate the captured thread end from the weft matrix.

If a weft insertion error occurs during the above operation, the above 330 °
At, the weft detector 48 detects the absence of the yarn, and the control device of the loom receives the detection signal and operates the cut preventing means 46 for a predetermined time. As a result, the cutting movement of the cutting cutter 45 is blocked. Further, the shutoff valve 25 is closed to stop the weft insertion function, and the stop phase angle is set to 300 ° to give an instruction to stop the main motor 2 abnormally. As a result, the reed 7 beats the miss yarn relating to the weft insertion error and then stops at the next 300 ° past the 180 ° phase position [Fig. 2 (A)]. Reference numeral M in the figure indicates a miss yarn, which is connected to the weft insertion nozzle 20 from the cloth fell F by the above cut prevention. Then, the following operations are sequentially performed according to the instruction from the control device.

(1) After releasing the electromagnetic clutch 32 and separating the weft measuring and storing device 30 from the spindle 1, the winding motor 34 is rotated for a predetermined time to store more than 2 picks of weft on the drum 31 and run in parallel with this. Then, the main motor 2 is reversely rotated at a low speed and stopped at the phase position 180 ° immediately before the miss yarn M is beaten. That is, at this phase position, the warp yarn opening becomes maximum and the miss yarn M is exposed on the cloth fell [Fig. 2 (B)].

(2) The electromagnetic valve 65 of the miss yarn pulling / removing device 60 is opened to inject air from the air nozzle 64, and the jet pump action by this causes the suction head 61 to suck the outside air.
Next, the shutoff valve 25 of the water supply path 10 is opened, and the three-way solenoid valve 22 is switched to the pressure air source 8 side for a predetermined time. As a result, the stored water in the sub-tank 21 is pressure-fed to the feed pipe line 16 and the weft insertion nozzle.
20 jets this. At this time (180 °), since the gripper 41 is opened, the stored weft yarns exceeding the two picks are ejected, and the weft yarns are inserted into the openings of the warp yarn Y and the catching yarn 51 so as to have a U shape, and the top portion thereof is inserted. Is sucked into the suction head 61 and pulled [FIG. 2 (C)]. Therefore, the folded portion A of the miss yarn M is successively peeled off from the cloth fell F by the pulling action described above and removed, and when this removal is completed, the above-mentioned inserted weft yarn is separated from the weft insertion nozzle 20 and the suction head 61. Spread straight between [Fig. 2 (D)].

(3) Rotate the main motor 2 forward to a phase angle of 10 °. At this 10 °, the cutting cutter 45 operates to separate the inserted weft from the weft insertion nozzle 20 [Fig. 2 (E)].

(4) The main motor 2 is rotated in the reverse direction again to bring the phase position to 180 ° in step (1). In this process, the separated weft threads are exposed to the front of the cloth, and are sucked by the suction head 61 to be removed [Fig. 2 (F)].

(5) The main motor 2 is further rotated in the reverse direction to pass the phase angle of 0 ° and then stopped at the restarting phase angle of 300 °. Here, the weft yarn beaten just before the mistake M appears in the cloth fell F [Fig. 2 (G)].

(6) The winding motor 34 is rotated for a predetermined time to store the weft corresponding to one pick on the drum 31 (FIG. 2 (H)). The electromagnetic clutch 32 is engaged, and if necessary, the three-way electromagnetic valve 22 is switched to the pressure air source 8 side for a predetermined time, and the water feeding path 10
After filling the weft filling water, the loom is restarted.

As described above, the above operation is automatically performed even when the weft detector 48 has made a detection error and the idle stop is performed. FIG. 3 shows the operation mode in this case, and the symbols (A) to (H) showing the sequence of this mode correspond to the same symbols (A) to (H) in FIG.

That is, when a weft thread that has been normally inserted is sent from the weft thread detector 48 due to a contact failure or the like to the weft thread detector 48, the control device issues the abnormal stop instruction to issue the pseudo missed thread. The M'is stopped at the phase of 300 ° while being connected to the cloth fell [Fig. 3 (A)]. In this case, the yarn end of the false miss yarn is caught by the catching yarn 51.

After that, the reverse rotation is performed up to 180 ° to expose the pseudo miss yarn M'to the cloth fell [Fig. 3 (B)], a suction airflow is generated in the suction head 61, and then the weft yarn accumulated on the drum 31 is U-shaped. Insert it in the shape of a letter and pull the folded portion A from the cloth fell by pulling it [Fig. 3 (C)]. Therefore, the inserted weft is spread between the weft insertion nozzle 20 and the suction head 61. If the false miss yarn M'is not peeled off from the catching yarn 51 in this process, it is drawn into the suction head 61 while being anchored to the catching yarn [Fig. 3 (D)]. After that, the inserted weft is separated [Fig. 3 (E)], the insertion weft is exposed to the front of the cloth and removed by suction [Fig. 3 (F)], and the positioning to the restart position 300 [Fig. 3 ( G)], and the steps of restart preparation and restart [Fig. 3 (H)] proceed while the pseudo miss yarn M'is anchored. When the catching yarn 51 after being restarted is pulled forward as described above, the above-mentioned anchoring portion also moves forward, and as shown by the chain double-dashed line in FIG. Wa is exposed to the edge of the razor-shaped thread cutter 70 and is cut there.

The embodiment is as described above.

In this embodiment, since the razor type thread cutter 70 is used, the structure can be made extremely simple. In this case, if the miss yarn pulling / removing device 60 is operated for a predetermined time after restarting, the pseudo miss yarn that has been tethered will come into contact with the cutting edge portion while tension is being applied, thus causing a cut error. No worries.

A heat cutter may be used as the contact cutting type thread cutter as described above, and a scissor type cutter may be used to pull the peeling step [FIG. 2 (D) or FIG. 3 (D)] and thereafter. It is also possible to activate it in a timely manner.

〔effect〕

As described above, according to the present invention, even when the missed yarn is not pulled off from the captured yarn in the pulling and removing process of the missed yarn, the missed yarn is cut off. The situation in which the yarn is pulled abnormally and a yarn breakage occurs is avoided.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a loom to which an embodiment of the present invention is applied, and FIGS. 2 and 3 are explanatory views of operation modes of the above loom. 17 …… Weft insertion pump, 20 …… Weft insertion nozzle 30 …… Weft measuring and storing device 48 …… Weft detector, 50 …… Yarn end capture device 51 …… Captured yarn 60 …… Miss yarn traction removal device 70… … Thread cutter Y… Warp, W… Weft Wa… Thread path, M… Miss thread M ′… Pseudo miss thread

Claims (1)

[Claims] 1. A yarn end catching device (50) for catching the yarn end of a weft (W) weft-inserted by using a catching yarn (51) arranged on the opposite weft-insertion side of a warp (Y) row. In a fluid jet loom equipped with a miss yarn pulling / removing device (60) for pulling and removing the miss yarn (M, M ′) when a weft insertion error occurs in the weaving, a mistake is made from the yarn end catching device. A fluid jet loom having a miss yarn pulling / removing device provided with a yarn cutter (70) for cutting a weft yarn connected to the yarn pulling / removing device.