JPH0318528Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an unexpected unraveling prevention device for the weft storage device of a fluid jet loom, and more specifically, it is a device that prevents unexpected unraveling by the cooperation of a solenoid, a spring, etc. In fluid injection type looms, which have a weft storage device in which a locking pin moves in and out of the circumference of the storage drum, and in which the main nozzle constantly injects a weak airflow except at the time of weft insertion, a power outage or power interruption occurs. The present invention relates to a technique for preventing unexpected unraveling of weft threads that sometimes occurs.

(Prior art and its problems) In the above type of loom, a pressure stream for weft insertion is supplied to the main nozzle during the weft insertion period, and the jet stream inserts the weft into the warp opening. . During periods other than the weft insertion period, a weak air current is ejected to maintain the posture of the weft at the main nozzle.

On the other hand, for looms with a weft storage device in which the movement of the locking pin of the weft storage device is controlled using a solenoid, a return spring, a magnet, etc., during the weft insertion period, the elastic force of the spring and the permanent The attraction force of the magnet causes the locking pin to retreat from the circumference of the storage drum to release the weft, and during the weft storage period when no other weft insertion operations are performed or when the loom is stopped, the locking pin is moved back by the attraction force of the excited solenoid. enters the circumferential surface of the storage drum and locks the weft yarn.

However, if the power is cut off due to a power outage or worker's carelessness while the weft is being held, the solenoid will be de-energized, and the elastic force of the spring will cause the holding pin to move against the circumference of the storage drum. The weft is released by retreating from the weft. During this period, the weak air current continues to be ejected, and the released weft threads are released from the circumferential surface of the storage drum due to this traction force and are gradually released. For this reason, not only does it take time to clean up the discharged weft yarns, but also a large amount of weft yarns are wasted, resulting in a significant drop in product yield. Particularly in the case of a power outage accident, such a phenomenon occurs simultaneously for all the looms in the factory, resulting in a very large loss.

(Summary of the invention) The purpose of this invention is to prevent troubles caused by the continuation of weak air jets when power supply is cut off.

For this reason, in this invention, an electromagnetic on-off valve that closes the circuit when the power supply is cut off during a power outage or power outage is installed in the weak airflow supply bypass, and the weak airflow is supplied from the bypass to the main nozzle. The purpose is to stop the

(Embodiment) In FIG. 1, the weft yarn W pulled out from the yarn supplying body 4 by the rotary yarn guide 2 is sequentially supplied onto the storage drum. On the other hand, the solenoid 8 is connected to a power source 60 via a controller C, which will be described later. When the solenoid 8 is no longer energized, the locking pin P driven by a solenoid 8 containing a spring or a permanent magnet retreats from the circumference of the storage drum to release the weft yarn, and the released weft yarn W becomes the main Weft insertion is performed by releasing the weft from the circumferential surface of the storage drum by the fluid jet from the nozzle N.

The fluid supply mechanism to the main nozzle N has a main path 30 for a main air flow for weft insertion and a bypass 40 for a weak air flow in parallel, both of which are connected to a fluid supply source 50.

The main path 30 connects a pressure reducing valve 32, a tank 34, and a solenoid valve 36 from the side near the fluid supply source 50.
have. This solenoid valve 36 opens and closes in synchronization with the weft insertion timing of the loom to control the injection for weft insertion.

The bypass 40 has a flow control valve 42, a solenoid valve 44, and a check valve 46, each connected to the fluid supply source 50 on one side and to the main path between the solenoid valve 36 and the main nozzle N on the other side. There is. This solenoid valve 44 is kept open while power is being supplied, but becomes closed when the power supply is cut off (that is, when a power outage or power interruption occurs).

In the illustrated example, the solenoid 8 is a controller with a delay circuit in order to retract the locking pin P of the solenoid 8 from the circumferential surface of the storage drum and delay the release of the weft yarn only in the event of a power outage or power interruption. It is connected to the power supply 60 via C.

Next, the operation of the device of this invention will be explained with reference to FIG.

When the loom is running and stopped (however, the power supply to the loom is not cut off), the solenoid valve 44
remains open and always supplies a weak airflow to the main nozzle. However, during the weft insertion period, the solenoid valve 35
is opened and the fluid pressure in the main path 30 becomes higher than the fluid pressure supplied from the bypass 40, so the check valve 46 closes and fluid is injected only from the main path 30.

The solenoid 8 that moves the locking pin of the weft storage device back and forth is energized during operation of the loom at a timing other than the weft insertion period (shaded area) as shown by A in the figure.
The locking pin enters the circumference of the storage drum. At this time, the weft yarn is stored on the storage drum.

On the other hand, at timings other than the shaded part A in the figure, that is, during the weft insertion period, the excitation of the solenoid 8 is released, the locking pin retreats from the circumference of the storage drum, the weft is released from the storage drum, and the main nozzle N
It is unraveled by a jet of water.

However, if a power outage or power cutoff occurs at time T1 during the weft storage period when no weft insertion is being performed, the solenoid 8 is de-energized at that point, as shown by B in the figure, and the locking pin moves around the storage drum. Retract from the surface to release the weft. However, at this point, the power is cut off and the solenoid valve 44 is also closed, so the supply of weak airflow to the main nozzle N is cut off, and the traction force disappears, so the unexpected unwinding of the weft on the storage drum is not performed. be.

Note that there may be a slight lag (delay) between the retreating action of the solenoid 8 and the closing action of the solenoid valve 44 when power is cut off. When the solenoid 8, which has a particularly small load, retreats at time T1 shown in C in the figure, the solenoid valve 44 closes at time T2 shown in C in the figure, which is delayed from time T1 due to the influence of inertia, and the traction force due to the injection from the main nozzle N disappears. However, there is a risk that unexpected unraveling of the weft yarn may occur during the period (T2-T1) from time T2 shown in C in the figure, which is slightly later than time T1 shown in B in the figure.

Therefore, a controller C including a delay circuit is interposed between the solenoid 8 and the power source 60 so that the retraction point of the locking pin P by the solenoid 8 is set to time T3 in the figure D, which is later than the time T2 when the solenoid valve 44 closes. . This makes it possible to completely prevent unintentional unraveling of the weft threads under any circumstances.

Note that in the bypass 40, a solenoid valve that discharges a weak airflow into the atmosphere may be used instead of a solenoid valve that blocks the flow.

(Effect of the invention) When a power outage occurs or the power is cut off, the solenoid valve 36,
44 is closed, even if the locking pin P of the weft storage device is released, there is no chance of unintentional unraveling of the weft on the storage drum. This eliminates the need to clean up the discharged weft yarns, eliminates wasteful consumption of the weft yarns, and improves product yield.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the device of this invention;
FIG. 2 is a graph showing the operation. 6... Storage drum, 8... Solenoid, W...
Weft, P...Lock pin, N...Main nozzle, 3
0...Main path, 40...Bypass, 60...
Power supply, C...controller.

Claims (1)

[Scope of Claim for Utility Model Registration] [1] The weft yarn from the yarn feeder is wound around and stored on a storage drum by a rotating yarn guide, and the weft yarn from the storage drum is deenergized by a solenoid for driving a locking pin. A weft storage device in which a locking pin is moved back from a circumferential surface of a storage drum to release a weft, and the solenoid is energized to cause the locking pin to enter into a circumferential surface of a storage drum to lock the weft. A main path for supplying pressurized fluid for weft insertion from a fluid supply source to the main nozzle N for weft insertion, and a path for supplying a weak air current to maintain the posture of the weft yarns. A fluid supply mechanism having a pass is characterized by having an electromagnetic on-off valve that becomes a closed circuit when the power supply is cut off in order to stop the supply of weak airflow from the bypass in the event of a power outage or power cutoff. An unexpected unwinding prevention device for a weft storage device of a fluid injection type loom. [2] The device according to claim 1, wherein a solenoid controller C having a delay circuit is interposed between the power source and the locking pin driving solenoid 8.