JPH03119144A - Device for picking of water jet type loom - Google Patents

Abstract

PURPOSE:To obtain the subject device, having a pump, a feed selector valve for picking water to many picking nozzles and controlling means for outputting a feed selection signal for the plural nozzles to the aforementioned valve in stopping a loom and capable of preventing weft yarn from falling off the picking nozzles. CONSTITUTION:A device for picking of a water jet type loom provided with valves 16 and 26, interposed between a picking water pump 3 and plural picking main nozzles 1 and 2 and capable of selecting feed of the picking water from the pump 3 to the plural picking main nozzles 1 and 2 and a controlling means 4 for outputting a signal for making at least >=2 of the plural picking nozzles 1 and 2 select feed of the picking water to the valves 16 and 26 in stopping the loom is used to subject weft yarn grippers 13 and 23 to gripping operation with the controlling means 4 in stopping the loom. The valves 16 and 26 are simultaneously subjected to opening operation for a prescribed time and the picking water is passed from the pump 3 through picking water feeding passages 15 and 25 and jetted from the picking main nozzles 1 and 2 to release weft yarns (W1) and (W2) from weft yarn storing devices 11 and 21 with jetted water and carry out picking.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weft insertion device for a water jet loom, and more particularly to a structure for preventing weft threads from coming out of the weft insertion nozzle when the loom is stopped.

Conventional technology A weft insertion device for a water injection loom that uses multiple weft threads has multiple weft insertion water supply paths branched from a weft insertion water pump that sucks in and discharges water in conjunction with the main shaft of the loom. A plurality of weft insertion nozzles are individually connected to the downstream side of the weft insertion water supply route, and a plurality of valves are individually provided in the middle of the plurality of weft insertion water supply routes, and the plurality of valves are connected individually to the downstream side of the weft insertion water supply route. By selectively operating the opening/closing valve according to the weft formation pattern, weft insertion water is injected from one of the plurality of weft insertion nozzles, and an electromagnetically driven weft gripper is attached to the weft insertion nozzle from the weft storage device. A structure is known in which the weft threads inserted through the
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In the above-mentioned weft insertion device, which the invention aims to solve, weft insertion defects may occur.
Or, if the worker stops the loom by operating the stop button, the loom is running at high speed and the next weaving cycle in which the weft insertion failure occurs, or the stop button is operated. It will stop at the next weaving cycle.

At this stop, the cotton filling water pump is linked to the main shaft of the machine A to suck in and discharge, so the valves that should be opened during the weaving cycle of stop + L according to the weaving pattern are opened and high pressure is applied. By injecting and releasing the weft inserting water from one weft inserting nozzle, overloading of the weft inserting water pump, weft inserting water supply path, valves, etc. is prevented. However, the weft yarn gripper is in a gripping state so that the weft yarn does not fly away due to the water jetted from the weft insertion nozzle. In other words, the force of the sprayed water acts on the weft inserted through the weft insertion nozzle that sprays the weft insertion water while being held by the weft gripper. For this reason, in the case of a weft insertion failure, if the weft insertion water is sprayed from a weft insertion nozzle other than the weft insertion nozzle that caused the weft insertion failure, the weft is only slightly protruding from the tip of the weft insertion nozzle, so the injection water is The weft yarn may come out of the weft insertion nozzle due to the reaction force of the force exerted by the water. Furthermore, even when the operator operates the stop button, the weft yarn may come out of the weft insertion nozzle due to the reaction force of the force exerted by the jet water, similar to the case where the weft insertion failure occurs. Moreover, the high pressure weft inserting water is 1
Since the weft is sprayed from two weft inserting nozzles, strong tension is applied to the weft, and it has been pointed out that when twisted yarn is used for the weft, there is a risk that the tip of the weft may come apart.

Therefore, although it is conceivable to individually provide drainage means such as relief valves between the valves of the plurality of weft insertion water supply paths and the weft insertion nozzles, it is difficult to suddenly adopt such a method from the viewpoint of cost reduction.

Means for Solving the Problems The present invention provides a valve that is interposed between a pump and a plurality of weft insertion nozzles and selects the supply of weft insertion water from the pump to the plurality of weft insertion nozzles, and a valve that is provided when the loom is stopped. and control means for outputting a signal to the valve to select the supply of weft insertion water to at least two of the plurality of weft insertion nozzles.

During the weaving operation, a plurality of valves are selectively opened and closed according to the weaving pattern, and a plurality of weft yarns are regularly inserted one by one.

When the loom stops due to a weft insertion failure or the stop button being operated, the control means opens at least two of the plurality of valves to remove the weft from the pump. The water is released using multiple weft insertion nozzles.

Embodiment As shown in FIGS. 1 to 5, reference numeral 1.2 denotes a plurality of weft insertion nozzles, and one weft insertion nozzle l receives the weft yarn Wl of a yarn feeder (not shown) from the weft storage device 11 into the weft guide. 12. Weft gripper 13. The weft yarn W2 is inserted via the weft guide 14, and the weft yarn W2 from a yarn supplying body (not shown), which is different from the one described above, is inserted into the other weft insertion nozzle 2 from a weft storage device 21, which is different from the one mentioned above. Weft guide 22. A further weft thread gripper 23 is inserted via a different weft thread guide 24. On the other hand, 3 is a pump (hereinafter referred to as a weft inserting water pump), which is a cam 3a that is linked to the main shaft of the loom (not shown).
In the suction process of the plunger 3b, water stored in a constant water level tank (not shown) is sucked in, and this suction water is discharged in the discharge process by a built-in plunger spring (not shown). A plurality of weft inserting water supply paths 15, 25 are branched from the discharge port of the weft inserting water pump 3. The plurality of weft insertion nozzles 12 are individually connected to the downstream side of the plurality of weft insertion water supply paths 15.25, and a plurality of valves 16.26 are individually provided in the intermediate portion thereof. . Here, the weft storage device 11.21 and the weft gripper 13.2
3 and valves 16 and 26 are individually driven and controlled by control means 4. That is, when the operator operates the start button 5 and a weaving operation signal is input, the control means 4 controls the plurality of weft storage devices 11. 21, while at the time of weft insertion, a plurality of weft yarn grippers 13, 23 are selectively opened and gripped according to the weaving pattern, and a plurality of valves 16, 26 are selectively opened and closed. do.

Further, the control means 4 controls the anti-weft insertion nozzle 1. than the warp Y row.
When the inserted weft Wl or the weft W2 should not reach the weft sensor 6 disposed on the second side, the tightened weft W
When I or the weft W2 reaches the weft sensor 6 and a weft presence detection signal is manually input from the weft sensor 6, it is determined that the weft insertion is normal and the weaving operation continues. On the other hand, if the inserted weft yarn Wl or the weft yarn W2 does not reach the weft sensor 6 at the above-mentioned time and a no-weft detection signal is manually inputted from the weft sensor 6, the control means 4 2.3 As shown in Figure 3, it is determined that weft insertion is defective, and a defective stop signal is output to the motor drive circuit of the loom main shaft (not shown), and the loom main shaft is activated in the 12th weaving cycle after weft insertion occurs. and the weft cutting function of the loom, that is, the cutting operation of the regular weft cutter, is stopped, the plurality of weft yarn grippers 13 and 23 are gripped, and the plurality of valves 16 are stopped.
．． 26 for a predetermined period of time, the main shaft of the loom is reversed as shown in FIG. 4, and the weaving cycle is stopped at the weaving cycle where the defective weft insertion occurred, and when the defective weft insertion yarn Wa is exposed on the front P, The weft gripper 13 or 23 on the side of the weft insertion nozzle l or weft insertion nozzle 2 where the defective yarn Wa is connected is opened, and the valve 16 or 23 on the side of the weft insertion nozzle 1 or weft insertion nozzle 2 where the defective yarn Wa is connected is opened. 26 is opened, and water is supplied to the weft inserting pump 3 by a weft inserting water injection means (not shown) provided upstream of the weft inserting water pump 3. The above-mentioned opened valve 16 or 26. The weft inserting water is injected from the weft inserting nozzle I or 2 via the weft inserting water supply path I5 or 25 provided with the valve 16 or 26 to remove the defective yarn Wa.
The defective yarn Wa is removed from the seven rows of warp yarns while the weft yarn Wt or W2 connected to the weft yarn Wt or W2 is removed from the seven rows of warp yarns, and the defective yarn disposal cutter (not shown) is operated to cut the warp yarns of the weft insertion nozzle L or 2. After cutting the weft W1 or W2 at the tip of the Y row side, the main shaft of the loom is reversed and stopped until the previous weaving cycle in which the weft insertion failure occurred, and the normal weft W just before the weft insertion failure occurred is woven. When the loom is exposed to the front P, the main shaft of the loom is rotated in the normal direction, a blank beating is performed, and then the weft yarn Wl or the weft yarn W2 is selectively inserted according to the weaving pattern, and the loom restarts automatically. Furthermore, as shown in Figure 5,
When the operator operates the stop button 7, the control means 4 outputs a stop signal to the loom main shaft motor drive circuit (not shown) to stop the loom main shaft at the next weaving cycle in which weft insertion occurs, and , performs the weft cutting function of the loom, that is, the cutting operation of the regular weft cutter, and also operates a plurality of weft thread grippers 13.2.
3 and open the plurality of valves 16 and 26 for a predetermined period of time.

According to the above embodiment structure, when the operator operates the start button 5, the control means 4 causes one of the weft yarn grippers 13, 23 of the plurality of weft yarn grippers 13, 23 to open in accordance with the weaving pattern. At the same time, a plurality of valves 1
6. One of the valves 16 or 26 of the valves 16 or 26 is selectively opened, and the weft insertion water flows from the weft insertion water pump 3 to the weft insertion water supply path 15 or 25 having the opened valve 16 or 26. Then, it is sprayed from the weft insertion nozzle 1 or 2.

Then, the water jetted from the weft insertion nozzle l or 2 releases the weft yarns W1 or W2 from the weft storage device If or 21, and the weft yarns are regularly inserted one by one into the warp shedding formed by the shedding movement of a shedding device (not shown). The warp threads Y
Weave a cloth C that has been completed by intersecting with '!'!
! J weaving furnace can be operated.

During the above-mentioned weaving operation, a defective weft insertion occurs and the control means 4 outputs a defective stop signal, or the stop button 7
When a stop signal is manually inputted to the control means 4 by the operation of The main shaft of the loom (not shown) stops, but at this stop, as shown in the timing chart of Fig. 2,
The control means 4 grips both of the plurality of weft yarn grippers 13.23 and opens both of the plurality of valves 16.26 for a predetermined period of time. As a result, the weft insertion water pressurized to high pressure during the discharge process immediately before the weft insertion water pump 3 stops passes through the plurality of weft insertion water supply paths 15° 25 and is injected from both of the plurality of weft insertion nozzles 1 and 2. and is forced to escape.

Note that the present invention is not limited to the above-mentioned embodiment, and although illustration is omitted, for example, when three or more weft insertion nozzles are provided and three or more weft insertion nozzles are used, three or more weft insertion nozzles are used. A total of 71 (O
R valves may be used to release high-pressure weft inserting water from all three or more weft inserting nozzles, but in this case, instead of opening all the valves, a valve smaller than all the valves, e.g. At least two or more valves may be opened to allow weft insertion water to escape.

Effects of the Invention As described above, according to the present invention, it is possible to avoid increasing costs by adding a drainage means such as a relief valve to each weft insertion water supply path of a water injection loom that uses a plurality of weft yarns. ,
At least two of the valves individually installed in the plurality of weft insertion water supply paths are opened for a predetermined period of time when the loom is stopped, and high-pressure weft insertion water from the weft insertion water pump is supplied to the plurality of weft insertion water supply routes. Since the weft insertion nozzle can be used to disperse and inject the water to escape, the sprayed water that is dispersed and released can be held by the plurality of weft grippers while being inserted into the plurality of weft insertion nozzles. The force acting on the sides of the weft yarn can be reduced, thereby eliminating the inconvenience of the weft yarn coming off from the weft insertion nozzle. Furthermore, when twisted yarns are used as the weft yarns, it is possible to prevent the weft yarns from coming apart.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a timing chart of the same embodiment, and FIGS. 3 to 5 are explanatory diagrams of the operation when a weft insertion failure occurs in the same embodiment. 1.2...Weft insertion nozzle, 3...Weft insertion water pump (
pump), 4...control means, 6...weft sensor, 7
...Stop button, 11.21...Weft storage device, 13
23... Weft gripper, 15.25... Weft insertion water supply path, 16.26... Valve.

Claims (1)

[Claims] (1) A valve that is interposed between a pump and a plurality of weft insertion nozzles and selects the supply of weft insertion water from the pump to a plurality of weft insertion nozzles; A weft insertion device for a water injection loom, comprising: a control means for outputting a signal to the valve to select two or more types of weft insertion water supply.