JPH0680219B2 - Drive device for weft locking body of weft storage device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a drive device for a weft-locking body in a drum-type weft storage device.

<Prior Art> As a conventional weft yarn storage device, for example, a device described in JP-A-59-9243 is known.

This is because the weft yarn is wound around the drum by a winding guide that relatively rotates around the drum, and a locking body arranged on the weft inserting nozzle side of this drum is driven by a cam or an electromagnetic actuator to move from the drum surface at a predetermined timing. The weft insertion nozzle causes the weft insertion nozzle to insert the weft into the weft, and the weft insertion is stopped by stopping the weft insertion by thrusting the weft into the drum surface. The stopper is moved from its withdrawal position to the plunging position (weft thread locking position).

<Problems to be solved by the invention> However, in this thing, after the loom is stopped,
Since the locking body is moved to the weft locking position, weft insertion is performed during the stopping process of the loom.

That is, the weaving machine is normally set to stop in the weft insertion process of the next weaving cycle in which the weft insertion error occurs, and therefore, as described above, the weaving machine is locked in the weft insertion process. Since the body comes out of the drum at the same timing as the normal weft insertion, it is in the state of coming out of the drum at the time of the stop. On the other hand, from the weft insertion nozzle, the opening / closing valve is closed by the stop signal of the loom, but a slight amount of residual air is ejected, and this ejection causes weft insertion. If weft insertion is done in this way, when restarting, first pull out the weft inserted in the stopping process from the warp shed, then reverse the weaving machine spindle to expose the weft insertion error yarn to the front, and then After the weft insertion error yarn is removed from the cloth fell, the start position is adjusted and restarted. Therefore, when weft insertion is performed in the stopping process, the work of removing the weft from the warp shed occurs, and therefore it is desired to prevent weft insertion in the stopping process to facilitate restarting. It was

The present invention has been made based on such a demand, and an object thereof is to prevent weft insertion in the stopping process.

<Means for Solving Problems> Therefore, in the present invention, an electromagnetic actuator that has a means for detecting a predetermined rotation angle of the loom main shaft and drives the locking body based on a signal from this detection means Is provided with a control circuit for controlling the drive current of the electromagnetic actuator so as to keep the locking body at the weft locking position when the loom stop signal is received.

<Operation> As described above, by keeping the locking body at the weft locking position by the stop signal of the loom, the locking body does not come out of the drum surface even at the withdrawal timing. The weft is not inserted even if there is jetting.

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

In FIG. 1, the weft yarn storage device 1 includes a drum 2 held in a stationary state, and a winding process of rotating the drum 2 around the drum 2 and winding a weft yarn W from a yarn feeder (not shown) around the drum 2. A guide 3 and a locking body 5 that projects into and out of a hole 4 provided on the front end side of the drum 2 are provided. Here, the winding guide 3
Is controlled so that the weft W of one pick or more is always stored in the drum 2. The locking body 5 is connected to the armature of the electromagnetic actuator 6 so that the locking body 5 is controlled to come out and enter. The weft W from the weft storage device 1 is passed through a guide 7 to a main nozzle 8 for weft insertion.

The main nozzle 8 is provided with a solenoid valve 11 which is opened from a pressure air supply source (not shown) by turning on the pressure regulator 9, the air tank 10, and the start preparation switch of the loom, and closed when the loom is stopped.
Also, compressed air is supplied through a mechanical valve 14 that is opened by a cam 13 fixed to a rotary shaft 12 that rotates in conjunction with the main shaft of the loom for a predetermined period of the weaving cycle, that is, a weft insertion period. 15 is a pressure gauge.

The electromagnetic actuator 6 of the locking body 5 is operated by the control circuit 16. The control circuit 16 includes an action piece 18 fixed to a rotary shaft 17 that rotates in conjunction with the main shaft of the loom and this action piece 18.
Proximity switch 19 which is provided so as to be opposed to the peripheral surface of 18 and outputs an H level signal when facing the high portion 18a of action piece 18, and the rising and falling edges of the signal from this proximity switch 19 are detected. Rising detection circuit 20 and falling detection circuit 21
And variable delay circuits 22 and 23 of variable delay time for delaying and transmitting the detection signals from the detection circuits 20 and 21, respectively, and receiving signals from these variable delay circuits 22 and 23 to the electromagnetic actuator 6. The switching circuit 24 controls the supply and stop of the drive current and the continuous stop of the drive current when the loom stop signal is received. Here, the proximity switch 19 constitutes a means for detecting a predetermined rotation angle of the loom main shaft in cooperation with the action piece 18.

Next, the operation will be described with reference to FIG. still,
Here, at the time of beating, the rotation angle of the main shaft of the loom is set to 0 °, and the number of rewinding of the weft W from the drum 2 is 6 so that one pick is inserted.

When the rotation angle of the loom main shaft reaches 90 °, the cam 13 opens the mechanical valve 14 to start air injection from the main nozzle 8, and at the same time, the high portion 18a of the working piece 18 causes the proximity switch 19 to move.
The output of the proximity switch 19 changes from L level to H level. Since this change is a rising edge, the pulse signal (b) from the rising edge detection circuit 20 is transmitted at this time. This signal (a) is delayed by the variable delay circuit 22 for a predetermined time α, and after that time α, the variable delay circuit 22 outputs a pulse signal (b). This signal (b) causes about 100
The switching circuit 24 is turned on at a temperature of °, and the drive current is supplied to the electromagnetic actuator 6. As a result, the electromagnetic actuator 6 pulls out the locking body 5 from the hole 4 over about 10 °, and prior to this, the weft insertion of the weft W is started by the air flow ejected from the main nozzle 8. During this weft insertion, the weft yarn W is unwound from the drum 2.

Then, at 190 °, the lower portion 18b of the action piece 18 faces the proximity switch 19, and the output of the proximity switch 19 changes from the H level to the L level. Since this change is the falling edge, the pulse signal (C) is transmitted from the falling edge detection circuit 21 at this time. This signal (c) is output to the variable delay circuit 23 for a predetermined time β
The pulse signal (d) is transmitted from the variable delay circuit 23 after a predetermined time β. About 22 by this signal (d)
At 0 °, the switching circuit 24 is turned off and the supply of the drive current to the electromagnetic actuator 6 is stopped. As a result, the electromagnetic actuator 6 causes the locking body 5 to project into the hole 4 by a built-in spring over about 10 °. By adjusting the delay time β, the rush timing is set to be between the fifth and sixth rewinding of the weft W (for example, 230 °), and when the sixth rewinding is completed, the weft W is attached to the locking body 5. To stop the rewinding and finish the weft insertion. The air injection from the main nozzle 8 is completed when the operation of the cam 13 ends at 210 ° earlier than this and the mechanical valve 14 closes.

In the beating process (about 300 °) after weft insertion, when a weft insertion error is detected, for example, a loom stop signal is output,
At the time of weft insertion in the next weaving cycle, the brake is operated to stop at 180 ° and the main motor is turned off. At the same time, a stop signal is sent to the switching circuit 24, and this is kept in the OFF state. That is, even if the rising signal is sent from the variable delay circuit 22, the switching circuit 24 continues to be in the OFF state as shown by the chain line in FIG. 2, so that the locking body 5 does not come out from the hole 4 of the drum 2. Therefore, even if air is jetted from the nozzle 8, weft insertion is not performed.

As the stop signal of the loom, there are signals issued by detecting a weft insertion error as described above, signals issued by detecting warp breakage, and signals issued by operating a manual stop switch.

In this embodiment, the delay time α of the variable delay circuit 22 is adjusted in order to adjust the withdrawal timing of the locking body 5 during the operation of the loom.
Can be varied, and the rush timing can be adjusted by varying the delay time β of the variable delay circuit 23.

The drum of the weft storage device may be configured by arranging a plurality of rollers in a frame shape. Further, the locking body may be one that appears on the drum surface from the inside of the drum.
The drum may be rotated, the winding guide may be fixedly arranged, and the weft may be wound around the drum.

<Effects of the Invention> As described above, according to the present invention, since the weft thread is continuously locked by the locking body in response to the stop signal of the loom, the weft insertion is not performed in the stopping process, and therefore the restart is performed. There is an effect that the work at the time of can be reduced. Further, the control circuit that controls the drive current of the electromagnetic actuator so as to keep the locking body at the weft locking position when receiving the stop signal of the loom, means for detecting a predetermined rotation angle of the loom main spindle during normal operation. Since the drive current of the electromagnetic actuator that drives the locking body is controlled based on the signal from the locking body, the operation timing of the locking body during normal operation can be adjusted by a simple operation such as adjusting the timing of the control circuit. The body can be operated at a desired main shaft angle, and more reliable weft insertion is possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart showing an operation example thereof. 1 ... weft storage device, 2 ... drum, 3 ... winding guide, 5 ... locking body, 6 ... electromagnetic actuator, 8 ...
Main nozzle, 16 ... Control circuit, 18 ... Working piece, 19 ... Proximity switch, 24 ... Switching circuit

Claims (1)

[Claims] 1. A weft (W) is wound around a drum (2) by a winding guide (3) which relatively rotates around the drum (2), and the weft (W) is arranged on the weft insertion nozzle (8) side of the drum (2). The locking body (5) is driven by the electromagnetic actuator (6),
The weft yarn (W) is inserted by being ejected from the drum surface by the fluid injection of the weft insertion nozzle (8), and the weft yarn (W) is locked by being thrust into the drum surface to finish the weft insertion. In the storage device, an electromagnetic actuator (6) having means (19) for detecting a predetermined rotation angle of the loom main shaft and driving the locking body (5) based on a signal from the detection means (19). A control circuit (16) is provided for controlling the drive current and for controlling the drive current of the electromagnetic actuator (6) so as to keep the locking body (5) in the weft locking position when the loom stop signal is received. A drive device for a weft locking body of a weft storage device.