JPH0759777B2 - Weft Removal Method for Fluid Jet Multicolor Weft Insertion Loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weft removing method for a fluid jet loom, and more specifically, a fluid having a multicolor weft inserting function for performing a weft length measuring and storing operation in synchronization with the loom. The present invention relates to a weft removing method for enabling automatic restart of a jet loom after the loom is stopped due to defective weft insertion or the like.

<< Prior art and its problems >> In a fluid jet loom having a multicolor weft insertion function, for example, when the weaving machine stops due to a cause such as a poor weft insertion, the cause of the stop is repaired, and further in all the weft storage devices. The weft yarn is discharged, a predetermined amount of preliminary winding is performed, and then the operation is restarted.

By the way, in the fluid jet loom having the one-color weft insertion function, many techniques for automating the re-operation after the loom is stopped have been proposed, but in the loom having the multi-color weft insertion function, the work for the re-operation is required. Due to its complexity, the current situation is that we must resort to this task. However, there is a problem that the work requires skill and the work efficiency is lowered, and the loom operating efficiency is lowered.

<Object of the Invention> It is an object of the present invention to provide a weft removing method which makes it possible to automate the restart of the fluid jet loom having the conventional multicolor weft insertion function after the stop.

<< Basic Configuration of the Invention >> In order to achieve the above object, the present invention disables the cutter provided at the weft insertion side fabric end after the loom stop signal is generated, and reverses the loom after the loom is stopped. After discharging, at least all the main nozzles that are not currently put in the weft eject the fluid and discharge the wefts in the weft measuring and storing device toward the warp opening, and at the same time, from each main nozzle tip into the warp opening. The main nozzle side simultaneously captures a series of weft yarns, pulls out the weft yarns from the warp opening with a mechanism for forcibly removing them, and removes the residual yarns in all the weft yarn storage devices and then performs a predetermined amount of preliminary winding. To do.

<< Examples >> Examples of the present invention will be described.

In the following description, for convenience of explanation, the water jet loom of the two-color one-over-one device is used, and the cause of the loom stop is due to weft insertion failure, but the invention is not limited to this.

As shown in FIG. 1, the main nozzles MN1 and MN2 are branched and connected by a valve 1, a strainer 2, a constant pressure tank 3, a pump 4 and a change valve 5 from a fluid supply source (not shown). Main nozzles MN1, MN2 and change valve 5
From the pipelines P1 and P2 that connect with the bypass pipelines BP1 and B respectively
The P2 pipeline is branched, and the bypass pipelines BP1 and BP2 are both connected to the upstream pipeline P3 of the constant pressure tank 3 via the solenoid valve 7 and the electromagnetic valve 9.

When weft insertion is normal, the electromagnetic valve 9 should be closed.
After the fluid path (bypass pipelines BP1 and BP2) is selected by the solenoid valve 7 while the loom is stopped, the electromagnetic valve 9 is set to "open" so that fluid is jetted from any main nozzle. .

That is, for example, when the weft W1 jetted from the first main nozzle MN1 is judged to be defective in weft insertion and the loom stop signal is output at the timing shown in FIG. Cutting cutter 13 (Fig. 3 (A))
(See) to temporarily stop the weft W1 from being cut.

Then, the weft grippers G1 and G2, which are arranged between the main nozzles MN1 and MN2 and the weft storage devices D1 and D2, are temporarily set to the “closed” state, which is the weft grip state, and the next cycle (4th pick) While preventing weft insertion, the weaving machine stops after performing about 1 cycle of inertial operation. That is, the first main nozzle MN1
The weaving machine is stopped while the miss weft W1 that has been inserted from is not cut. At this time, in the first weft storage device D1, as shown in FIG. 2, a predetermined amount of wefts that have been length-measured and stored during inertial operation for about one cycle are stored. The second
The weft yarn storage device D2 also stores the weft yarns for which weft insertion is blocked.

Next, the connection between the weft storage device (not shown) and the main shaft of the loom is disconnected to temporarily disable (stop) the miss weft W1.
The loom is reversed and the yarn is taken out to a state where it can be removed, for example, around a crank angle of about 180 degrees.

Then, set both weft grippers G1 and G2 to "open", which is the weft release state.
State.

Thereafter, the solenoid valve 7 described in FIG. 1 is connected to the second main nozzle MN2, and the solenoid valve 9 is connected.
Is set to the “open” state, and as shown in FIGS. 3A and 3B, the fluid is jetted from the second main nozzle MN2 to
From the main nozzle MN2, the weft W2 stored in the second weft storage device D2 is temporarily discharged into the warp opening. At this time, the wefts W1 and W2 from the main nozzles MN1 and MN2 are both connected to the inside of the yarn opening.

In this state, as shown in FIG. 3 (D), with a predetermined weft removing device 30, both wefts W1 and W2 are simultaneously engaged at the tip of the main nozzle, and both wefts W1 and W2 are forced from the warp shed. Pull out. At this time, the weft yarns remaining in all the weft yarn storage devices are simultaneously removed. As the weft removing device used here, various devices which have been already disclosed by the applicant of the present application and the like can be used as long as they are capable of simultaneously engaging and removing both the wefts W1 and W2.

In this way, after the residual yarns in all the weft yarn storage devices have been removed, the loom is reversed to a position where it can be restarted. After that, a predetermined amount of preliminary winding is performed. At this time, in this embodiment, as shown in FIG.
Only done for D1. Then, preparation for re-operation, that is, the weft cutting cutter 13 and the weft storage devices D1 and D2 are returned to the operating state, the electromagnetic valve 9 is closed, and the loom is restarted by a predetermined restart method.

The fluid circuit for flying the weft yarn from the second main nozzle MN2, which is not currently weft-inserted, toward the warp opening is not limited to that shown in FIG. It goes without saying that any method may be used as long as it is for carrying out.

In addition, the second main nozzle which is not currently inserted
The first of the weft-inserted ones when ejecting fluid from MN2
It goes without saying that the main nozzle MN1 may also be used to inject the fuel. In this case, the fluid circuit mechanism is simple and requires only slight modification.

Further, the present invention can be applied to re-operation when the loom is stopped due to occurrence of warp breakage. For example, when a warp break occurs, a loom stop signal is generated at the same timing as in the above embodiment. At this time, if the cutter as in the embodiment is not inactivated or the weft gripper is in the "closed" state, the weft W2 is connected from the second main nozzle MN2 into the warp opening when the loom is stopped. It becomes a state. Then the first main nozzle
If the fluid is jetted from MN1 and the weft yarn W1 is temporarily discharged into the warp shed, the same operation as in the above embodiment can be performed. This simplifies the work for restarting when the loom is stopped due to warp breakage.

<Effect> According to the method of the present invention, the residual yarn in the weft storage device on the main nozzle side, which is not currently weft-inserted, can be removed at the same time. Since it can be automated, there is no need for a worker to restart the machine, which not only saves a large amount of labor costs, but also allows the weft removal work, which requires the most time, to be performed in one step, so the loom operating efficiency is improved. Also, it is possible to provide an inexpensive multicolor woven woven fabric.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a fluid supply pipeline to a main nozzle for carrying out the method of the present invention. FIG. 2 is a chart showing the operation timing of each mechanism in the method of the present invention. 3 (A) to (D); an explanatory view showing the operation of the present invention. 1 ... Valve, 2 ... Strainer, 3 ... Constant pressure tank,
4 ... Pump, 5 ... Change valve, 7 ... Solenoid valve, 9 ... Electromagnetic valve, 13 ... Weft cutting cutter MN1, MN2 ... Main nozzles G1, G2 ... Weft grippers D1, D2 ... Weft storage device W1, W2 ... Weft

Claims (1)

[Claims] 1. A multi-color weft inserting loom, in which the weft cutting cutter is inactivated at a predetermined timing after a loom stop signal is generated, and then all weft grippers are closed to prevent weft insertion in the next cycle. The wefts that have been wefted are connected from the main nozzles to the woven fabric, and after the loom is stopped, the weaving machine is reversed to take out and all the weft grippers are opened. Fluid is jetted from the nozzles, the wefts in the weft storage device are jetted from these main nozzles toward the warp opening, and then all the wefts connected from the tip of each main nozzle to the warp opening at the main nozzle tip side at the same time. A weft removing method for a pre-jet type multicolor weft inserting loom, characterized in that, after capturing, the weft is forcibly withdrawn and the residual yarn in all the weft storage devices is removed.