JPH073018B2 - Weft insertion method in jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method for inserting a plurality of wefts.

(Prior art) In the jet loom, when the weft is ejected from the main weft insertion nozzle, the weft tip that is on standby for weft insertion is towed by a fine jet, and the tow is extended to adjust the posture. A method of performing weft insertion injection is generally adopted, and this can suppress the occurrence of weft insertion errors. However, since the fine injection is performed during the operation of the loom, when weft yarns are sequentially injected from a plurality of weft-inserting main nozzles that are in a fixed arrangement with the weft-inserting passage, the injection of each weft-inserting main nozzle is performed. When the mouths are set close to each other, the front ends of the weft yarns exposed by the fine jet are easily entangled with each other, which impedes weft insertion. JP 61
In Japanese Patent Laid-Open No. 138747, a partition is provided between the injection ports of the main nozzles for weft insertion to prevent entanglement between the tip of the weft and the weft connected to the weft insertion passage that are exposed to the fine injection.

(Problems to be solved by the invention) However, in this countermeasure, the positional relationship between the cutter and the screen, which performs the weft cutting operation for each reed, is essentially the positional relationship between the cutter and the injection port of the weft inserting main nozzle. It is inevitable that the tip of the weft will come out to the front side of the screen due to the fine jet, and the entanglement between the weft tip exposed to the fine jet and the adjacent weft thread in the weft insertion passage is ensured. There is no stopping you.

Configuration of the Invention (Means for Solving the Problems) Therefore, in the present invention, a plurality of weft yarns are sequentially injected from a plurality of weft-inserting main nozzles fixedly arranged in the weft-inserting passage in accordance with a weft-inserting pattern. In the method, the main weft inserting nozzle that is in the weft inserting main nozzle out of the plurality of weft inserting main nozzles performs fine injection for a period before and after including the weft injection start time, and is waiting for another weft inserting. Fine injection was stopped at the weft insertion main nozzle.

(Operation) That is, the tip portion of the weft thread on standby for weft insertion is stretched by the fine jet and extends from the injection port of the main nozzle for weft insertion, and is directed toward the weft insertion passage with the attitude of the weft thread tip portion adjusted. It is put in the weft. During this weft insertion period, fine jetting is stopped at the other weft insertion main nozzles that are waiting for weft insertion, and the weft tip of the other weft insertion main nozzles is in the jet opening of the weft insertion main nozzle. I'm withdrawn. Therefore, the leading end of the weft yarn and the weft yarns connected to the weft insertion passage are not entangled with each other, and the weft insertion is not hindered.

(Example) Hereinafter, one example which materialized the present invention is described based on a drawing.

As shown in FIG. 1, a pair of weft-insertion main nozzles 1A and 1B that swing together with the sley 2 have the injection ports 1a and 1b.
It is directed toward one end side of the weft insertion passage 3a on the front surface of the deformed reed 3 which is erected above. The weft yarns Y1 and Y2 ejected from the pair of weft-insertion main nozzles 1A and 1B are weft-inserted into the weft-insertion passage 3a according to a predetermined weft-insertion pattern, and a plurality of weft-insertions mounted on the sley 2 at predetermined intervals. The auxiliary nozzle 4 for relay transports the inside of the weft insertion passage 3a. Main nozzle for weft insertion
1A is connected to the pressure air supply tank 6 through the collecting pipe 5a and the electromagnetic valve 5A, and the main nozzle for weft insertion
1B is connected to the pressure air supply tank 6 via the collecting pipe 5b and the electromagnetic valve 5B, and the auxiliary nozzle 4 for weft insertion supplies a plurality of units of pressure air through the electromagnetic valve 7 (four in this embodiment). It is connected to the tank 8.

A manual switching valve 9A is connected to the collecting pipe 5a,
An air supply pipeline having an electromagnetic valve 10A and a pressure controller 11A interposed therein and an air supply pipeline having a pressure controller 12A interposed therein are connected in parallel to the switching valve 9A. The switching valve 9A has an automatic reset type push button 9a.By pressing this push button 9a, the collecting pipe 5a communicates with the pressure controller 12A, and if the push button 9a returns, the collecting pipe 5a and the electromagnetic Communicates with valve 10A. That is, in order to insert the weft Y1 into the weft insertion main nozzle 1A, the push button 9a is pressed, and the tip of the weft Y1 is introduced into the weft Y1 by jetting the supply air at this time. In the normal state where the push button 9a is automatically restored, the air of the pressure adjusted by the pressure controller 11A can be supplied to the weft-insertion main nozzle 1A, and by this air supply, the weft-insertion main nozzle 1A is supplied. Fine injection is performed.

A similar switching valve 9B is also connected to the collecting pipe 5b, and an air supply pipeline with an electromagnetic valve 10B and a pressure controller 11B interposed therebetween and an air supply pipeline with a pressure controller 12B connected in parallel. The air supply pipelines are connected to the air supply sources of the pressure air supply tanks 6 and 8.

Weft insertion main nozzles 1A, 1B and weft insertion auxiliary nozzle 4
The electromagnetic valves 5A, 5B, 10A, 10B for controlling the air supply to the electromagnetic valves 5A, 5B, 10A, 10B are controlled to open and close based on the command of the control computer C, and the control computer C selects the electromagnetic valves 5A, 5B based on the preset weft insertion pattern. In addition to issuing an opening / closing command, a relay opening / closing command is issued to the electromagnetic valve 7. A curve A1 in FIG. 2 represents the open / closed state of the electromagnetic valve 5A, and a curve B1 represents the open / closed state of the electromagnetic valve 5B. Curve A2 represents the open / closed state of electromagnetic valve 10A, and curve B2 represents the open / closed state of electromagnetic valve 10B.
That is, the weft yarns Y1 and Y2 are alternately weft-inserted, and the weft-insertion main nozzle 1A includes the weft-insertion period and does not include the weft-insertion period on the weft-insertion main nozzle 1B side. In addition, the same fine injection is performed by the weft inserting main nozzle 1B.

Based on such fine injection timing, by appropriately setting the weft tip position during fine injection and the weft tip position during fine injection stop in consideration of the contraction force of the wefts Y1, Y2, for example, As shown in Fig. 1, since the main nozzle 1A for weft insertion which is in standby for weft insertion does not perform fine injection, the tip portion of the weft Y1 is jetted out 1a of the main nozzle 1A for weft insertion due to the contracting force of the weft Y1.
It retracts inside and waits, and the tip of the weft Y1 and the weft insertion passage 3a
There is no entanglement with the weft yarn Y2. Further, before the weft insertion of the weft Y1 is started, the main nozzle 1A for weft insertion performs fine injection in a period before and after the weft ejection timing, so that the front end of the weft Y1 is aligned and extends from the ejection port 1a. Put out. Since this weft-inserting main nozzle 1B is in a standby state, fine jetting is not performed, and the tip of the weft Y12 is the same as the above-mentioned weft-inserting main nozzle 1B.
The two wefts Y1 and Y2 are smoothly ejected without being entangled with each other by pulling them into the injection port 1b of B and waiting, and moreover, weft insertion errors can be suppressed to the same extent as when wefting only a single weft. .

The present invention is not of course limited to the above-mentioned embodiment, and a mechanical lobe is used instead of an electromagnetic valve as a fine injection control valve, or a jet loom equipped with three or more weft insertion main nozzles. It is also possible to apply the present invention to.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, of the plurality of weft-insertion main nozzles fixedly arranged in the weft-insertion passage, at least the weft-injection is performed by the weft-insertion main nozzle that is in the weft-insertion starting position. Fine injection is performed before and after the start time, and during the weft insertion period of the other main weft insertion nozzles, the main wetting main nozzle that is on standby is set to stop the fine injection. The leading end of the inside weft thread does not entangle with the weft thread in which it is inserted, and it has the excellent effect that weft insertion errors can be suppressed to the same extent as a single weft insertion without hindering the injection of the weft thread. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment embodying the present invention, and FIG. 2 is a graph showing timings of weft insertion injection and fine injection. Weft insertion main nozzles 1A, 1B, weft insertion passage 3a, electromagnetic valves 10A, 10B, wefts Y1, Y2, curves A2, B2.

Claims (1)

[Claims] 1. A method of sequentially injecting a plurality of wefts from a plurality of main weft inserting nozzles fixedly arranged in a weft inserting passage in accordance with a weft inserting pattern, wherein one of the plurality of main weft inserting nozzles is used. A jet that performs fine injection at the weft insertion main nozzle that is ready to start weft insertion for a period before and after including the weft injection start time, and stops fine injection at another weft insertion main nozzle that is waiting for weft insertion. Weft insertion method in the room.