JPS58126345A - Apparatus for preventing weave step of loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a weaving machine with a weaving stage (thin film or thick film) at the time of restart.
The present invention relates to a device for preventing.

In a loom in which the warp threads pulled out from the warp beam are guided to the weaving front while being applied with a predetermined tension by an elastically supported guide member (for example, a back roller), weft thread breakage or warp thread breakage occurs during weaving. When the loom is stopped for reasons such as this, if it takes a long time to restart, the warp threads are left under tension, which may cause the warp threads to stretch slightly depending on the type of thread.

When such elongation occurs, the fabric moves forward (to the presto beam side), so when restarting the machine, the first few picks became thin films.

In addition, the first few strokes (especially the first stroke) when restarting are within the start-up time of the loom's main motor, so the reed speed is lower compared to the steady state, and this occurs due to inertia at the forward limit of the reed. Since the forward deflection due to the elasticity of the reed is also small, the thin film was also caused by the fact that the reed was positioned further back when striking the reed compared to the normal state.

For this reason, as described in Japanese Patent Application Laid-Open No. 56-4747, applied tension increasing means for increasing the tension applied to the warp threads when restarting the loom, specifically, a means for increasing tension applied to the warp yarns when restarting the loom, specifically, a device that receives a starting signal of the loom, has been proposed. The system is equipped with an actuator that operates for a predetermined period of time, and a tension applying body that is moved in a direction intersecting the warp threads by this actuator, and the applied tension is increased randomly during the first few taps at the time of restart to adjust the position of the loom. Adjustments have been made to prevent thin films.

By the way, causes for a loom to stop include warp thread breaks and weft insertion defects. For example, in the case of a warp thread breakage, it is repaired with the warp threads closed, and in the case of a weft insertion problem, it is repaired with the warp threads open. to repair. Therefore, if the repair angle is used as the restart angle, restarting will be performed from different angles, for example, in the case of warp breakage and in the case of defective weft insertion.

However, if the restart angles differ in this way, the rotational speed of the main shaft during the main motor's rise time, for example, during the first reed strike, will differ, so the amount of deflection of the reed will also differ, for example, when restarting from a closed state. If the applied tension by the applied tension increasing means is set in accordance with the starting time, it will become floating when restarting from the open state (first pick after one dry hit), and if the setting is reversed, the applied tension will be in the closed state. There was a problem with a thin film forming when restarting the engine.

Therefore, in practice, it was decided to always restart from the same restart angle, and if repairs were made at an angle different from this determined angle, the machine would be manually moved to the determined angle and then restarted. . This is extremely troublesome, and it has been desired to be able to immediately restart the engine from the repaired angle.

The present invention has been made in view of these demands, and includes a restart angle detection means for detecting the restart angle of a loom so that an applied tension commensurate with the restart angle after repair, and a method for detecting the restart angle in the future. This book is provided with a movement amount changing means for changing the amount of movement of a tension applying body by an actuator serving as an applied tension increasing means in accordance with a restart angle based on a signal.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 and 2, 1 is a warp beam, 2 is a warp, 3 is a guide roller, and 4 is a back roller, and the warp 2 pulled out from the warp beam 1 is guided by the guide roller 3 and the back roller 4. After that, it is pulled through heddles and reeds (not shown) and guided to the cloth.

The back roller 4 connects its shaft portion 4a to the frame 5 of the loom.
The lever 7 is rotatably supported at one end of a lever 7 whose intermediate portion is fixed to a shaft 6 which is rotatably supported by a shaft 6.A tension spring 8 is applied to the other end of the lever 1.

In this way, the lever 7 is biased clockwise in FIG. 1 by the tension spring 8, and a predetermined tension is applied to the warp threads 2 via the back roller 4. As the winding diameter of the warp beam 1 decreases as weaving progresses, the delivery speed of the warp threads 2 decreases and the tension of the warp threads 2 increases. At this time, the lever 7 is moved counterclockwise via the back roller 4. In connection with this, the gear ratio of the continuously variable transmission in the drive system (not shown) of the warp beam 1 is changed, the rotational speed of the warp beam 10 is increased, and the tension of the warp threads 2 is increased. Corrected.

In this example, the guide roller 3 constitutes a tension applying body of a means for increasing the applied tension at the time of restarting, and its shaft portion 3a is rotatably pivoted at its upper end to a shaft 9 protruding from the frame 5. The lever 10 is rotatably supported at the intermediate portion of the lever 10. The lever 10 is biased counterclockwise by the tension of the warp yarns 2 acting on the guide roller 3, and comes into contact with a stopper 11 protruding from the frame 5. A roller 12 is rotatably attached to the lower end of the lever 10.

On the other hand, the bracket 13 fixed to the frame 5 is suspended)
An air cylinder 15 as an actuator of the applied tension increasing means is fixed via 14a and 14b, and an engaging body 17 attached to the tip of the output rod 16 is connected to the roller 12.
They face each other so that they can come into contact with each other.

This air cylinder 15 includes a three-way solenoid valve 18 and a pressure regulator 19.
It is connected to a pressure air supply source (not shown) via a pipe 20. In the normal state, the three-way solenoid valve 18 opens the inside of the air cylinder 15 to the atmosphere, and in the open state, the output rod 16 is drawn in by a built-in spring (not shown). The three-way solenoid valve 18 has a solenoid 18a.
(Fig. 3), pressurized air is introduced into the air cylinder 15, thereby causing the output rod 16 to protrude and the engaging body 17 to contact the roller 12, and the lever 10 to be rotated clockwise. Then, the guide roller 3 is moved.

Further, a stopper 21 is fixed to the frame 5 at a position opposite to the air cylinder 15 with respect to the roller 12,
When the roller 12 is pushed by the air cylinder 15, the p-roller 12 comes into contact with the stopper 21.

Then, a part of the auxiliary stopper 22 is engaged with a dovetail groove 21a formed in the vertical direction on the stopper 21, so that the auxiliary stopper 22 can slide on the stopper 21, and in the downward movement position, the roller 12 is moved into the auxiliary stopper 22. They should be in contact with each other. This auxiliary stopper 22 is normally moved upward by a spring 24 stretched between the stopper 21 and a bottle 23 projecting from the top. Further, an actuation rod 26 of an electromagnetic actuator 25 fixed to the lower part of the stopper 21 is connected to the auxiliary stopper 22 . When the solenoid 25a (FIG. 3) of the electromagnetic actuator 25 is energized, the actuating rod 26 is retracted to move the auxiliary stopper 22 downward.

Next, the operating circuit of the three-way solenoid valve 18 and the electromagnetic actuator 25 will be explained with reference to FIG. Electrical circuit A has a normally open automatic return type push button switch 4 for starting auxiliary equipment (such as a blower).
0, normally closed contact 46a of relay 46 and relay 41, which will be described later
are connected in series, and a normally open contact 41a of a relay 41 is connected in parallel to the switch 40.

Normally open contact 41b1 of relay 41 and relay 46 are connected to electric circuit B.
A normally closed contact 46b1 of a normally open automatic return type push button switch 42 for driving the main motor and a relay 43 are connected in series, and a normally open contact 43a of a relay 43 is connected in parallel to the switch 42. . Relay 41 is on circuit C
Normally open contact 41c1 with timer 1 normally closed contact 4 of relay 46
6c and relay 54 are connected in series.

Further, a solenoid 18a of the three-way solenoid valve 18 and a normally open contact 61a of a relay 61, which will be described later, are connected in series to the electric line. A solenoid 25a of the electromagnetic actuator 25 and a normally open contact 62a of a relay 62, which will be described later, are connected in series to the electric line E.

Furthermore, the electric circuit F includes a relay 46 and a stop circuit 45, which will be described later.
A normally closed contact 4'5a which is opened by the operation of is connected in series. These electric lines A-F are connected to a power supply G in parallel.

A disc 56 is attached to a shaft 55 that rotates once per rotation of the main shaft in synchronization with the main shaft of the loom, and is color-coded or has a different surface finish so that the reflectance of light varies by 180 degrees. In this example, 56A and 56B are color units. 5
Reference numeral T denotes a detector integrally equipped with a light emitter and a light receiver, the color components facing the disk 56, and outputting changes in the amount of received light as an electrical signal. By the way, when the restart angle of the loom is between 270° and 90° (centered on the closing angle range), the color segment is 90° centered on the maximum opening.
~270' (opening angle range), the color is part 56B
are opposed to the detector 57, and the detector 57 outputs different electrical signals at these times.

The output side of the detector 57 is the normally open contact 54a of the relay 54.
It is connected to the sorting circuit 58 via.

The sorting circuit 5B receives the signal from the detector 5T and issues a signal to the bistable multivibrator 590 set terminal, and also determines the restart angle of the loom based on the signal from the detector 57, and when the opening angle is within the shedding angle range, A signal is sent to an actuation circuit 60, which will be described later. When the bistable multivibrator 59 receives a signal from the selection circuit 58, the relay 6
1 and an actuating circuit 60.

The actuating circuit 60 is configured to issue a signal to the relay 62 while receiving the signal from the bistable multivibrator 59 and when receiving the signal from the sorting circuit 5B.

Reference numeral 48 denotes an operating piece fixed to the rotating shaft 47, which rotates once per rotation of the main shaft. Reference numeral 49 denotes a proximity switch, which is disposed close to the rotation path of the working piece 4B and emits a pulse every time the working piece 48 approaches.

50 is a counting circuit (branch circuit) which, when a set number of pulses are input from the proximity switch 49, continues to output signals until a reset signal is input from a stop circuit 45, which will be described later. The output side of this counting circuit 50 is connected to a reset terminal of a bistable multivibrator 59. 45 is a stop circuit which is connected to a warp thread breakage detector, a weft thread detector, a selvage thread breakage detector, and a manual stop device (not shown), and is connected to a stop circuit when a reed, warp thread breakage, faulty weft insertion, or selvage thread breakage is detected. Alternatively, it is activated when the manual stop device is operated, and the normally closed contact 45a is opened and a signal is issued to the reset terminal of the count circuit 50.

Here, the restart angle detection means for the color components includes a disk 56 and a detector 57, and includes a stopper 21 and an auxiliary stopper 22.
A movement amount changing means for changing the amount of movement of the guide roller 3 by the air cylinder 15 includes the electromagnetic actuator 25 and its operating circuit. ′ Next, the effect will be explained.

When the switch 40 is closed to restart the loom, the relay 41 is activated, and the self-holding contact 41a as well as the contacts 41b and 41c are closed, and the auxiliary equipment is activated.

Since the contact 41c is equipped with a timer, the electric circuit C is momentarily (
For example, about 2 seconds) is closed, and at this time, the relay 54 is activated, and the contact 54! Close L. This allows the detector (
The light from the emitter (emitter/receiver) 57 hits the color portion 5671 or 56B of the disc 56 and bounces off, and an electrical signal corresponding to the amount of light received by the receiver is transmitted from the detector 57 to the sorting circuit 58. Sent.

Here, the restart angle of the loom is within the closing angle range (270
90°), for example, as shown in Figure 3, the darker side (
Since the portion 56A of the color component (low reflectance) is opposite to the detector 51, the amount of light received is small, so the selection circuit 58 that receives the corresponding electric signal determines that it is in the closing angle range. , no signal is sent to the actuating circuit 60.

A signal (this signal is independent of the restart angle and is output when the contact 54a is closed) is sent from the selection circuit 58 to the set terminal of the bistable multivibrator 59. Then, the bistable multivibrator 59 is triggered, an output signal is generated, the relay 61 is activated, the contact point 61a of the electric circuit is closed, and the solenoid 18a of the three-way solenoid valve 18 is energized. Therefore, the three-way solenoid valve 18 is opened. At the same time, the output signal of the bistable multivibrator 59 is sent to the actuation circuit 60, but since there is no signal from the selection circuit 5B, the actuation circuit 60 does not actuate the relay 61. Therefore, the contact 62a of the electric path E remains open, the solenoid 25a of the electromagnetic actuator 25 is not excited, and the electromagnetic actuator 25 is maintained in a non-operating state.

When the three-way solenoid valve 18 is opened, pressurized air is introduced into the air cylinder 15, and as shown in FIG. , rotate it clockwise until it hits the stopper 21.

Therefore, the guide roller 3 moves by an amount suitable for applying tension in the closing angle range, increasing the tension applied to the warp yarns 2. As a result, the position of the cloth front is adjusted and weaving steps are prevented.

Next, when the switch 42 is closed, the relay 43 is activated, its contact 43a is closed and self-maintained, and the main motor is activated.

This starts the loom, but the action piece 48 causes the proximity switch 49 to send out a pulse every time the main shaft rotates once, so if the frequency division ratio of the count circuit is set to 1/1, the first rotation A signal is transmitted from the counting circuit 50 at the first pick of the section, and the bistable multi-pipe lake 59 is reset by this signal. Then, the output of the bistable multivibrator 59 becomes "O", the relay 61 is demagnetized, and the contact 61a is opened. Therefore, the solenoid 1.8a of the three-way solenoid valve 18 is demagnetized, and the solenoid 1.8a of the three-way solenoid valve 18 is demagnetized.
8 operates to close the valve.

At this time, the air cylinder 15 is activated by the three-way solenoid valve 18.
The inside is open to the atmosphere, the output rod 16 is pulled in by the built-in spring, and the engaging body 17 is moved against the roller 1 of the lever 10.
It will no longer come into contact with 2. Therefore, the guide roller 3
The lever 10 is rotated counterclockwise together with the lever 10 by the tension of the lever 10, and the lever 10 returns to the position where it contacts the stopper 11.
Thereafter, the position of the guide roller 3 is kept constant.

Also, when restarting the loom, the restart angle is within the shedding angle range (90
270°), when the switch 40 is closed, the portion 56B of the high reflectance color of the disk 56 is detected by the detector 57.
Since the amount of light received by the detector 57 is large, the selection circuit 58 that receives the corresponding electric signal determines that the opening angle range is within the range, and sends the signal to the actuation circuit 60 to actuate the electromagnetic actuator 25. give to Therefore, the output signal of the bistable multivibrator 59 activates the relay 61, which closes the contact 61a and energizes the solenoid 18a of the three-way solenoid valve 18. The activation circuit 60 is activated by the signal, the relay 62 is activated, and the contact 62a is activated.
and closes the solenoid 25a of the electromagnetic actuator 25.
Excite.

In this case, as shown in FIG. 5, the output rod 1G of the air cylinder 15 protrudes due to the opening operation of the three-way solenoid valve 18, but the solenoid actuator 25 operates and retracts its operating rod 26. When the roller 12 of the lever 10 is pushed by the engagement member 17 of the output rod 16 in order to move the auxiliary stopper 22 connected thereto downward, the roller 12 comes into contact with the auxiliary stopper 22 . Therefore, the amount of rotation of the lever 100 is reduced, and the amount of movement of the guide roller 3 is also reduced. Therefore, although the tension applied to the warp yarns 2 becomes small, it becomes optimal for applying tension in the opening angle range. Thereafter, the switch 42 is closed to start the loom, and when the loom exceeds a predetermined start, it returns to its original state in the same manner as described above.

When a stop signal is sent from the stop circuit 45 while the loom is in operation, the count circuit 50 is reset, the contact 45a of the electric circuit F is opened, and the relay 46 is deactivated. 46c is opened, the self-holding of relays 41 and 42 is also released, and the auxiliary equipment and main motor are also stopped.

In the above embodiment, the restart angle of the loom is detected in two types and the movement amount of the guide roller 3 is changed in two stages, but if necessary, the restart angle can be changed to three or more types. It is obvious that the detection can be performed separately and the amount of movement of the guide roller 3 in each case can be made different.

Further, in the above embodiment, the guide roller 3 is moved by the air cylinder 15 to increase the applied tension, but the back roller 4 is forcibly moved via the lever 7 to increase the applied tension. In this case, the amount of movement of the back roller 4 is changed according to the high start angle.

As explained above, according to the present invention, there is a restart angle detecting means for detecting the restart angle of the loom, and a tension applying body using an actuator as a means for increasing tension applied at restart according to the detected restart angle. Since the machine is provided with a movement amount changing means for changing the movement amount of the weave, the optimum applied tension can be obtained even when restarting from the closing angle range, the opening angle range, or any other angle range, and this prevents the occurrence of weaving steps. Not only can this be avoided, but it also makes it possible to restart immediately after repair, which greatly improves work efficiency.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the main parts of a loom, Fig. 2 is a view in the direction of the ■ arrow in Fig. 1, and Fig. 3 is a three-way solenoid valve and electromagnetic actuator in Fig. 1. Operating circuit diagram, 4th
5 and 5 are side views of main parts in different operating states. 1...Warp beam 2...Warp thread 3...Guide roller 4...Back roller 8...Tension shaft 17/10...Lever 1
2...Roller 15...Air cylinder '17...
Engaging body 18... Three-way solenoid valve 18a... Solenoid 21... Stopper 22... Auxiliary stopper 25... Electromagnetic actuator 25'a'
... Solenoid 56 ... Colors are discs 57.
...detector 58...at the time of selection circuit Applicant: Fujio Sasashima, Patent Attorney, Nissan Motor Co., Ltd. Figure 4/.

Claims (1)

[Claims] The warp threads (2) pulled out from the warp beam (1) are guided by an elastically supported guide member (4) while applying a predetermined tension to guide them to the weaving front. an actuator (15) that operates for a predetermined period of time; and a tension applying body (3) that moves in a direction intersecting the warp threads (2) in conjunction with the actuator (15) to increase the tension applied to the warp threads (2). In such a loom, restart angle detection means (56, 57) for detecting a restart angle of the loom are provided.
1, and movement changing means (20, 2) for changing the amount of movement of the tension applying body (3) by the actuator (15) according to the restart angle based on the detection signal of the restart angle detection means.
1, 25) A weaving step prevention device for a loom, characterized in that it is provided with: