JP2717540B2 - Method for preventing weft nozzle from coming off in fluid jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for preventing a weft from missing a nozzle in a fluid jet loom, and more particularly to a method for preventing a nozzle from being removed when a spuntex is used for a weft.

<Prior Art> A technique disclosed in Japanese Patent Application Laid-Open No. 54-6959 is known as a method for preventing a weft thread from being pulled out from a weft insertion nozzle in a fluid jet loom.

This is because low pressure air is injected from the weft insertion nozzle when cutting the weft, and the weft is pulled by this air flow, thereby preventing the nozzle from slipping out due to contraction due to the recoil of the extended weft.

<Problems to be solved by the invention> By the way, due to recent diversification of woven fabrics, even in a fluid jet type loom, a spuntex (we use elastic material such as rubber for the core yarn) In a stretched state, a span or the like is wrapped around the outside, and the degree of expansion and contraction is extremely large).

When this spuntex is used, when low-pressure air is jetted from a weft insertion nozzle at the time of cutting a weft as described in the above-mentioned publication, the air is stretched forward of the nozzle due to its traction force, and the degree of elongation is large. There is a problem that it will be.

Further, when the loom is stopped due to a weft insertion error or the like, air is not injected from the weft insertion nozzle during stoppage from the viewpoint of energy saving, so that there is also a problem that the weft itself shrinks and comes out of the weft insertion nozzle. Even if the low-pressure air is jetted from the weft insertion nozzle even at the time of stopping, the air is entangled in the warp row as described above.

In view of such a conventional problem, an object of the present invention is to provide a method for preventing a weft from coming off a nozzle in a fluid jet loom particularly suitable when a spuntex is used for the weft.

<Means for Solving the Problems> For this reason, the present invention relates to a fluid jet loom having a weft pulling nozzle between a weft storage device and a weft insertion nozzle, wherein the pulling nozzle is operated regardless of the operation / stop of the loom. While the loom is stopped, when the signal relating to the threading is issued while the loom is stopped, the ejection of the pulling nozzle is temporarily stopped.

<Operation> In the above method, the nozzle of the weft is ejected from the traction nozzle instead of the weft insertion nozzle to prevent the weft from coming off. In addition, since the injection is continuously performed regardless of the operation or stoppage of the loom, it is possible to reliably prevent the weft from coming off the nozzle. On the other hand, when a signal related to threading is issued while the loom is stopped, the injection of the pulling nozzle is temporarily stopped.

It should be noted that the soft injection may be performed from the weft-insertion to the extent that the yarn does not stretch.

<Example> An example of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a weft supply unit for the weft W, and reference numeral 2 denotes a drum type weft storage device. The drum type weft storage device 2 can measure and store the length of the weft W by winding the weft W around a drum 3 held in a stationary state by a winding guide 4 rotating around the drum 3, and the weft can be inserted by retreating the locking pin 5. I do.

6 is a weft guide, 7 is a pulling nozzle, and 8 is a weft insertion nozzle. Here, the weft insertion nozzle 8 is fixed to the end of the holder of the reed 9 so as to move integrally with the reed 9, and the traction nozzle 7 may be fixed on a loom frame (not shown).
It is desirable to make it move integrally with the weft insertion nozzle 8.

The traction nozzle 7 is supplied with pressure air, which is regulated to a low pressure by a pressure regulating valve 10 from a pressure air supply source (not shown) and guided to a surge tank 11 via an electromagnetic on-off valve 12. .

The weft insertion nozzle 8 is supplied with a pressure air from a pressure air supply source (not shown) which is pressure-regulated for weft insertion by a pressure regulating valve 13 and guided to a surge tank 14 via an electromagnetic on-off valve 15. It has become. Further, a bypass passage 16 that bypasses the on-off valve 15 is provided, and a throttle 17 and a check valve 18 are interposed in the bypass passage 16.

Reference numeral 19 denotes a control circuit which receives a preparation signal, a start signal, a stop signal, and a threading signal from a control panel of a loom (not shown), and a timing signal synchronized with the rotation of the main shaft of the loom. Controls the opening and closing of the on-off valves 12,15.

Next, the operation will be described with reference to the timing chart of FIG.

The loom's preparation signal is issued, and then the start signal is issued, and the loom is started. Before that time, the on-off valve 12 of the traction nozzle 7 has been opened, and the low-pressure air from the traction nozzle 7 has been opened. The weft W is prevented from coming off from the weft insertion nozzle 8. In addition, the weft insertion nozzle 8 itself is supplied with extremely low-pressure air throttled by the throttle 17 through the bypass passage 16 and ejects the air to prevent the nozzle from coming off.

When the loom is started, the on-off valve 15 of the weft insertion nozzle 8 is opened at a predetermined rotation angle of the main shaft of the loom, and the weft insertion nozzle 8 is opened.
, High-pressure air is ejected from the nozzle, and the weft W is inserted.

During operation of the loom, the on-off valve 12 of the traction nozzle 7 is open, and low-pressure air is injected from the traction nozzle 7. This ensures that the weft yarn W is pulled out from the weft storage device 2 during weft insertion, and prevents the weft W from being pulled out of the weft insertion nozzle 8 at times other than during weft insertion.

Except during weft insertion, ie, during opening of the on-off valve 15, extremely low-pressure air throttled by the throttle 17 is supplied from the weft insertion nozzle 8 by the bypass passage 16 and is injected therefrom. This also prevents nozzle omission.

When the loom stop signal is issued, the loom stops,
The on-off valve 12 of the traction nozzle 7 is continuously opened, and low-pressure air is injected from the traction nozzle 7. This prevents the weft W from coming off the weft insertion nozzle 8.

From the weft insertion nozzle 8, extremely low-pressure air throttled by a throttle valve 17 through a bypass passage 16 is supplied and injected. This also prevents nozzle omission.

If the threading signal is issued while the loom is stopped,
Only during this time, the on-off valve 12 of the traction nozzle 7 closes. Thereby, there is no effect on the operation of drawing the weft thread W through the weft insertion nozzle 8. When the threading signal is deleted, the on-off valve 12 of the traction nozzle 7 opens again.

<Effects of the Invention> As described above, according to the present invention, regardless of the operation / stop of the loom, continuous injection is performed from the weft pulling nozzle between the weft storage device and the weft insertion nozzle. Even when using stretchable wefts such as yarns, the injection of the weft insertion nozzle can be performed at extremely low pressure or stopped, so that the weft nozzle can be reliably prevented from coming off without getting entangled in the warp row. it can. On the other hand, when the signal relating to the threading is issued while the loom is stopped, the injection of the pulling nozzle is temporarily stopped, which may affect the work of drawing the weft through the weft insertion nozzle. Absent. In other words, if the jet fluid from the traction nozzle is continuously jetted while the loom is stopped, the airflow is disturbed by the jet fluid from the traction nozzle toward the weft insertion nozzle and the reflected flow that collides with the weft insertion nozzle, There is a risk that the weft thread may not be able to pass through the weft insertion nozzle.Therefore, a signal related to threading is used to stop the ejection of the weft thread, so that the weft thread can be easily pulled into the weft insertion nozzle without being affected by the pulling nozzle. It has a special effect that it is possible to perform through work.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG. 2 is a timing chart of the operation. 2 ... weft storage device, 7 ... pulling nozzle, 8 ... weft insertion nozzle, 10 ... pressure regulating valve, 12 ... on-off valve, 13 ... pressure regulating valve,
15 ... On-off valve, 16 ... Bypass passage, 17 ... Throttle, 19 ...
... Control circuit

Claims (1)

(57) [Claims] 1. A weft storage device (2) and a weft insertion nozzle (8).
A fluid jet loom provided with a weft pulling nozzle (7) between the weaving machine and the continuous weaving nozzle regardless of the operation of the loom, A method for preventing the weft nozzle from slipping off in a fluid jet loom, wherein the jetting of the pulling nozzle (7) is temporarily stopped when a signal is issued.