JPS6135296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing weaving steps from occurring in a woven fabric when a loom is started.

In Japanese Patent Application Laid-Open No. 56-4747, the present applicant has proposed that the thin steps that occur when the loom is restarted, that is, when the loom is restarted, the amount of elastic deflection of the reed beating device is smaller than when it is in steady state. When the reed position did not reach the normal position, a thin layer was created when the reed was started again. We proposed a device to prevent steps.

However, in recent years, the motors used to drive looms have become more sophisticated, and when the loom is started, the main shaft reaches the operating speed similar to steady motion within about half a rotation. When the loom stops due to the relationship, the loom stops in a closed state, that is, the rotation phase of the main shaft during beating is set to 0.
If it is set at 300 degrees, it will stop at about 300 degrees, so if you manually reverse it from that position to the open state (about 180 degrees) and perform repair work, and then restart from that state, the reed will start beating after about half a turn of the main shaft. As a result, the amount of deflection of the reed beating device becomes almost the same as in the steady state, so that weaving steps no longer occur even without using the device of JP-A-56-4747 mentioned above. On the other hand, for the warp-related stop table where repair work is performed with the main shaft almost closed, the repair work is performed while it is stopped with the main shaft closed, as described above, and restarted from the closed state, so in this case, approximately Since reeding is performed by 1/6 rotation, the reeding device has not yet reached a steady amount of deflection, so in this case, a weaving step is generated.

This invention was made in order to solve the above-mentioned problem, and when restarting from the open state, tension is applied to the warp threads, but when restarting from the open state, by stopping the application of tension, the main shaft is The purpose of this is to always prevent weaving from occurring no matter what rotational phase the restart is carried out.

The drawings will be explained below. In the figure, 1 is a warp beam, 2 is a warp, 3 is a cross roller, and 4 is a guide roller.
After being guided by the roller 3, it is pulled through heddles and reeds (not shown) and guided to the fabric. The guide roller 4 is rotatably supported by a shaft 6a at the middle part of a lever 6 whose base is pivotally supported by a shaft 5 projecting from the frame F, and a roller 7 is attached to the lower end of the lever 6. It is rotatably attached by. Reference numeral 8 denotes an air cylinder as an actuator, which is fixed to a bracket 10 projecting from the frame F via supports 9a and 9b. An engaging body 11 fixed to the tip of the output rod 8a of the air cylinder 8 is disposed opposite to the roller 7 so as to be able to come into contact with the roller 7. This air cylinder 8 also includes a three-way solenoid valve 12 and a pressure regulator 1.
It is connected to a source of pressurized air via a pipe 14 with 3. The three-way solenoid valve 12 normally opens the air cylinder 8 to the atmosphere, so the output rod 8a of the air cylinder 8 is normally drawn in by a built-in spring (not shown). When the solenoid of the three-way solenoid valve 12 is energized, pressurized air is introduced into the air cylinder 8 to push out the output rod 8a. In addition,
Reference numeral 15 designates a stopper for the lever 6 that protrudes from the frame F.

Next, the electric circuit of the device of the present invention will be explained with reference to FIG. Auxiliary equipment (e.g. blower, etc.) is connected to electric circuit A.
Normally open automatic return type push button switch 40 for starting
A normally closed contact 46b of a relay 46 and the relay 41, which will be described later, are connected in series, and a normally open contact 41 of a relay 41 is connected in parallel to the switch 40.
a is connected.

The normally open contact 41a of the relay 41, the normally closed contact 46b of the relay 46, the normally open automatic return type push button switch 42 for driving the main motor, and the relay 43 are connected in series to the electric circuit B. The normally open contacts 43a of the relays 43 are connected in parallel.

In the electric circuit C, there is a normally open contact 4 with a timer of a relay 41.
1a, the normally closed contact 46b of the relay 46, and the relay 55 are connected in series. This relay 55
The normally open contact 55a of the circuit X for detecting the rotation angle of the main shaft of the loom is closed when electricity is applied. Reference numeral 56 is a disc attached to a shaft that rotates in synchronization with the main shaft of the loom, and if the rotational phase during beating is 0°, light is reflected at the point where the warp is open at 100° to 250°. The surface finish may be varied or color coded to indicate different rates. 57 is disk 5
It is a detector that integrates light projectors and receivers provided at opposite positions of 6, and transmits changes in the amount of received light as an electrical signal to an electric line 57a. 58 is a selection circuit which sends its output to a bistable multivibrator 59. That is, the selection circuit 58 is set not to output between 100° and 250°, but to output at other times. Upon receiving the signal, the bistable multivibrator 59 sends a signal of a predetermined length to the electromagnetic actuator 61 .

The solenoid 12a of the three-way solenoid valve 12 is connected to the electric circuit D.
and a normally open contact 61a operated by the electromagnetic actuator 61 described above are connected in series.

The electric line E includes a relay 46 and a stop circuit 4, which will be described later.
A normally closed contact 45b that opens when 5 is activated is connected to the normally closed contact 45b. Each of the electric circuits A to E described above is connected in parallel to the power supply.

Reference numeral 47 is a rotating shaft that rotates once per rotation of the main shaft of the loom, and 49, to which an operating piece 48 is fixed, is a proximity switch, which is disposed close to the rotation path of the operating member 48, and which operates. A pulse is emitted each time the piece 48 approaches. A counting circuit 50 is connected to the proximity switch 49, and when a set number of pulses are input from the proximity switch 49, it continues to output a signal until a reset signal from the stop circuit 45 is input. The output of this count circuit 50 is connected to the reset terminal of a multivibrator 59. Reference numeral 45 denotes a stop circuit, which is connected to a weft thread detector, a selvage thread breakage detector, a warp thread breakage detector, and a manual stop device (not shown), and opens the normally closed contact 45b when these are activated. This stop circuit 45 is connected to the reset terminal of the count circuit 50.

Next, the operation of the apparatus of the present invention constructed as described above will be explained. When restarting the loom, switch 4
When 0 is closed, the relay 41 is activated and all relay contacts 41a including the self-holding contact 41a are closed, so that the auxiliary equipment is activated. As a result, the electric circuit C is closed momentarily, for example, for 2 seconds, and the relay 55
is activated and closes the contact 55a. As a result, the light emitted from the detector 57 hits the disk 56 and is reflected, so the light is received by the light receiver and an electric signal corresponding to the amount of received light is sent to the selection circuit 58. For this reason〓〓〓〓
The selection circuit 58 detects the warp in accordance with the signal, that is, when the dark colored portion (100° to 250°) of the disk 56 faces the detector 57, as shown in FIG. , the amount of light received is small, so the detector 57 does not transmit a signal. Therefore, in this case, there is no action to apply tension to the warp threads.

When the light colored portion of the disc 56 and the detector 57 are facing each other, that is, when the warp threads are in an open state,
Since the amount of light received is large, the detector 57 emits a signal, and as a result, the selection circuit 58 sends a pulse signal to the set terminal of the bistable multivibrator 59. As a result, the multivibrator 59 outputs a signal, activates the electromagnetic actuator 61, and contacts 61a of the electric circuit D.
is closed, the solenoid 12a of the three-way solenoid valve 12 is energized, and the three-way solenoid valve 12 is opened. That is, the air cylinder 8 shown in FIG. 1 is communicated with a pressurized air supply source (not shown) via the piping 14. Therefore, pressurized air enters the air cylinder 8, and the output rod 8a
protrudes and moves the roller 7 to the left in the figure via the engaging body 11. Since the lever 6 rotates clockwise as the roller 7 moves, the guide roller 4 also moves to the left in the figure and pushes the warp threads 2. Therefore, warp 2
The tension increases, and the weave moves slightly toward the reed to take the proper position and prevent the weaving from collapsing. In this case, the amount of movement of the output rod 8a of the air cylinder 8 is the amount in which the air pressure and the warp tension are balanced. The adjustment may be performed using the pressure regulator 13 provided on the pipe 14.

Next, when switch 42 is closed, relay 43
is activated, the relay contact 43a is closed and self-retained, and the loom drive motor (not shown) is activated. This causes the loom to operate, and each time the main shaft of the loom makes one revolution, the action piece 48 sends a signal to the proximity switch 49, so if the count circuit 50 is set to 1, the count circuit 50 An output signal is transmitted from the multivibrator 59 to reset the multivibrator 59. As a result, there is no output from the multivibrator 59, so the contact 61a is opened. Therefore, the solenoid 12a of the three-way solenoid valve 12 is demagnetized, so the air cylinder 8 is opened to the atmosphere and the output rod 8a is
is pulled in by a spring built into the cylinder. Therefore, the engaging body 11 moves backward and the lever 6 hits the stopper 15 and stops.

When a stop signal is transmitted from the stop circuit 45, the count circuit 50 is reset by the signal, and the contact 45b is opened to close the relay 5.
6 becomes inoperative, and as a result, the contact 46b is opened, the self-holding of the relays 43 and 41 is released, and the auxiliary equipment and the drive motor of the loom are stopped.

Since the present invention is as described above, according to this, when restarting the loom from the warp closed state,
Tension is applied to the warp threads, but no tension is applied to the warp threads when the warp threads are restarted from an open state, and as a result, an excellent effect is obtained in that the occurrence of weaving steps due to restarting the loom can be completely eliminated.

[Brief explanation of the drawing]

FIG. 1 is an elevational view of the device of the present invention, and FIG. 2 is an electrical circuit diagram of the device of the present invention. 1... Warp beam, 2... Warp, 3... Cross roller, 4... Guide roller, 6... Lever,
7... Roller, 8... Air cylinder, 8a... Output rod, 11... Engaging body, 12... Three-way solenoid valve, 13... Pressure regulator, 14... Piping. 〓〓〓〓

Claims (1)

[Claims] 1. The warp threads pulled out from the warp beam are guided while being applied with a predetermined tension by an elastically supported guide member, and guided to the fabric front, and a tension applying member provided across the warp rows; In a loom that serves as a moving means to increase the tension applied to the warp threads by operating for a predetermined period of time when the loom is restarted, a restart angle detection means for detecting the main axis angle of the loom is provided, and this restart angle detection means is provided. A loom step prevention device for a loom, comprising a control device that operates the moving means when the means detects a closed state and does not operate the moving means when the means detects an open state.