JPH0258381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing weaving rows (thin rows or thick rows) when restarting a loom.

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 a guide member (for example, a cross crawler), the loom may be stopped due to weft breakage or warp breakage during weaving. If it takes a long time to restart the machine, the warp threads are left under tension, and depending on the thread type, all the warp threads may elongate slightly. When this elongation occurred, the cloth front moved forward (toward the presto beam), so the first few picks when restarted were thin.

In addition, the first few picks (especially the first pick) when restarting are within the start-up time of the main motor of the loom, so the speed of the reed 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 step was also caused by the reed being positioned further back when striking the reed compared to the normal state.

For this reason, conventionally, as described in Japanese Patent Application Laid-Open No. 56-4747, the loom operates for a predetermined period of time in response to a starting signal, and for example, by forcibly moving the warp guide, the warp threads are moved. An applied tension increasing means is provided to increase the applied tension, and the applied tension is increased intermittently for the first few picks at the time of restart to adjust the position of the cloth front, thereby preventing thin rows. was.

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, when starting with the repair angle as the restart angle,
For example, the machine will be restarted from different angles 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, when striking the first pick, will also differ, so the amount of deflection of the reed will also differ, for example, when restarting from the closing phase. If the applied tension by the applied tension increasing means is set according to the starting time, the thick step will be obtained when restarting from the open phase (first pick after one blank firing), and if the setting is reversed, the applied tension will become thick. There was a problem with a thin stage when restarting from phase.

Therefore, in practice, it is always decided to restart from the same restart angle, and if the repair is made at an angle different from this determined angle, manually move it to the determined angle and then restart. was. 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 restart angle detection means for detecting the restart angle of the loom so that warp tension matching the restart angle can be obtained when restarting the loom after repair. and applied tension changing means for selecting the state of the applied tension increasing means in accordance with the restart angle based on the detected signal from now on.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In Figure 1, 1 is a warp beam, 2 is a warp, 3 is a back crawler, and the warp beam 1
The warp yarns 2 pulled out from the cloth are guided by a cross roller 3, and then passed through heddles and reeds (not shown) and guided to the fabric front.

The back crawler 3 has its shaft portion 3a rotatably supported by one end portion of an easing lever 6 whose intermediate portion is fixed to a shaft 5 rotatably supported by a frame 4 of the loom. A pin 7 is protruded from the other end of the easing lever 6, and a support bracket 9 attached to one end of a tension spring 8 is pivotally connected to the pin 7. A support bracket 10 attached to the other end of the tension spring 8 is rotatable by a pin 13 protruding from a tension lever 12 fixed by fitting a square hole 12a into a torsion bar (the square shaft part) 11. A nut 15, which is screwed onto the threaded rod 14, is latched to a transparent window 10a formed in the support bracket 10. The tension lever 12 is rotatably connected to a piston rod 18 of a piston type oil damper 17 by a pin 16, and is connected to a cylinder case 19 of the oil damper 17.
is rotatably supported by a pin 20 protruding from the frame 4.

One end of a rod 22 is rotatably connected to a pin 21 protruding from the tension lever 12, and the other end of the rod 22 is connected to a gear lever 2 of a continuously variable transmission 23.
4 by a pin 25 so as to be rotatable. 22a is a length adjustment mechanism provided at both ends of the rod 22. The continuously variable transmission 23 changes its gear ratio depending on the rotational position of the gear lever 24 (H in the figure is the high speed side, L is the low speed side), and the input shaft (not shown) is connected to the main motor of the loom. A gear 27 fixed to the output shaft 26 meshes with a gear 29 fixed to one end (outside the frame 4) of a transmission shaft 28 rotatably supported by the frame 4. A gear (not shown) fixed to the other end of the transmission shaft 28 (inside the frame 4) meshes with a gear 30 fixed to the side surface of the weave beam 1.

Thus, while visually checking the dial gauge 31 fixed to the frame 4 of the loom,
1 is rotated clockwise in the figure by an amount set according to the type of warp thread 2, etc., and then the tension lever 12 is fitted and fixed as described above to apply a counterclockwise moment to it. The easing lever 6 is biased clockwise via the tension spring 8, and tension is applied to the warp threads 2 via the back roller 3. Here, the tension fluctuation due to the opening and closing of the warp threads 2 is transmitted to the easing lever 6 via the bow roller 3 and causes it to swing, but it is buffered by the tension spring 8 and the oil damper 17.
The tension lever 12 is hardly swung.
When the winding diameter of the warb beam 1 decreases as weaving progresses, the delivery speed of the warp threads 2 decreases, the tension of the warp threads 2 increases, and the easing lever 6 is rotated counterclockwise in the figure via the cross roller 3. Therefore, the tension lever 12 is rotated clockwise via the tension spring 8. As a result,
The rod 22 is pushed up and the gear lever 24 of the continuously variable transmission 23 is rotated counterclockwise, the gear ratio (reduction ratio) is decreased, the rotational speed of the warp beam 1 is increased, and the tension of the warp threads 2 is reduced. It will be corrected.

On the other hand, an air cylinder 33 is fixed to a bracket 32 erected on the frame 4, and its outlet rod 34 is fixed.
An engaging body 35 fixed to the tip of the easing lever 6 is opposed to the easing lever 6 so as to be able to come into contact therewith.

As shown in FIG. 2, this air cylinder 33 is connected to a pipe 37 for supplying pressurized air via a three-way solenoid valve 36. In the normal state, the three-way solenoid valve 36 opens the pressure chamber of the air cylinder 33 to the atmosphere, and in the open state, the output rod 34 of the air cylinder 33 is retracted by the spring 38. The three-way solenoid valve 36 is operated by the solenoid 3.
When 6a is energized, the pipe 37 and the pressure chamber of the air cylinder 33 are communicated with each other, whereby the output rod 34 protrudes and rotates the easing lever 6 clockwise in the figure via the engaging body 35. There is.

The pressure air supply pipe 37 branches into two on the supply side, and one side is equipped with a pressure regulating valve 91A and a solenoid valve 92A. , high voltage circuit 9
3A is configured. In addition, a pressure regulating valve 9 is provided on the other side.
1B and a solenoid valve 92B are interposed, and the pressure regulating valve 91B
A low pressure circuit 93B is configured by setting the set pressure to a low value. Solenoid valve 92A,
Both solenoids 92B are normally closed and open when their respective solenoids 92Aa and 92Ba are energized. Both the high pressure circuit 93A and the low pressure circuit 93B are connected to a pressurized air supply source 94 on the inlet side of the pressure regulating valves 91A and 91B.

Next, the three-way solenoid valve 36 and the solenoid valves 92A, 92B
The operating circuit will be explained with reference to FIG. Electric line A
A normally open automatic return push button switch 40 for starting auxiliary equipment (such as a blower), a normally closed contact 46a of a relay 46 (described later), and a relay 41 are connected in series to the switch 40, and a relay is connected in parallel to the switch 40. 4
One normally open contact 41a is connected. A normally open contact 41b of a relay 41, a normally closed contact 46b of a relay 46, a normally open automatic return type push button switch 42 for driving the main motor, and a relay 43 are connected in series to the electric circuit B. The normally open contacts 43a of the relays 43 are connected in parallel.
The circuit C has a normally open contact 41 with a timer of a relay 41.
c, normally closed contact 46c of relay 46 and relay 54
are connected in series.

In addition, the electric circuit D includes a solenoid 36a of the three-way solenoid valve 36 and a normally open contact 61a of a relay 61, which will be described later.
are connected in series. There is a solenoid valve 92 in the electric line E.
Solenoid 92Aa of A and relay 62 described later
normally open contacts 92a are connected in series. A solenoid 92Ba of a solenoid valve 92B and a normally open contact 63a of a relay 63, which will be described later, are connected in series to the electric circuit F. Furthermore, the electric line G includes a relay 46,
A normally closed contact 45a that is started by the operation of a stop circuit 45, which will be described later, is connected in series. These electric lines A to G are connected to a power source H in parallel.

Reference numeral 56 is a disc attached to a rotary 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 differs by 180 degrees. In this example, 56A and 56B are color-coded parts. 57 is a detector integrally equipped with a light emitter and a light receiver, and the color-coded disc 56
It outputs changes in the amount of light received as an electrical signal. Here, when the restart angle of the loom is between 270° and 90° (centered on the closing phase), the color-coded portion 56A is displayed, and when the restart angle of the loom is between 90° and 90° centered on the maximum opening.
At 270° (aperture phase), the color-coded portion 56B faces the detector 57, and at these times the detector 57 outputs different electrical signals.

The output side of the detector 57 is connected to a sorting circuit 58 via a normally open contact 54a of the relay 54. Upon receiving the signal from the detector 57, the selection circuit 58 issues a signal to the set terminal of the bistable multivibrator 59, and also determines the restart angle of the loom based on the signal from the detector 57. A signal is sent to the operating circuit 90 to select the solenoid valve 92A or 92B. When bistable multivibrator 59 receives a signal from selection circuit 58, it issues a signal to relay 61 and actuation circuit 60. Operating circuit 60
While receiving the signal from the bistable multivibrator 59, it emits a signal to the relay 62 or 63 in accordance with the signal from the selection circuit 58.

48 is a rotating shaft 47 that rotates once per rotation of the main shaft.
It is a working piece that is fixed to. Reference numeral 49 denotes a proximity switch, which is disposed close to the rotation path of the operating piece 48 and emits a pulse each time the operating piece 48 approaches. 50 is a counting circuit (frequency dividing circuit) which, when a set number of pulses are inputted from the proximity switch 49, continues to output signals from then on until a reset signal is inputted from a stop circuit 45, which will be described later. The output side of this counting circuit 50 is connected to the reset terminal of a bistable multivibrator 59. Reference numeral 45 denotes 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 setting (not shown), when a warp thread breakage, faulty weft insertion, or selvage thread breakage is detected. Alternatively, it is activated when a manual stop device is activated, and the normally closed contact 45a
is opened, and a signal is issued to the reset terminal of the count circuit 50.

Here, the applied tension increasing means includes the air cylinder 33, the three-way solenoid valve 36, and its operating circuit, and the restart angle detection means includes the color-coded disc 56 and the detector 57, and the pressure regulating valve 91A, 91
B. The applied tension changing means is constituted by the electromagnetic valves 92A, 92B and their operating circuits.

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 closed for a moment (for example, about 2 seconds), and at this time the relay 54 is activated to close the contact 54a. As a result, the light from the light emitter of the detector (light emitter/receiver) 57 hits the color-coded portion 56A or 56B of the disc 56 and is reflected, and an electrical signal corresponding to the amount of light received by the light receiver is transmitted from the detector 57. It is sent to a sorting circuit 58.

Here, when the restart angle of the loom is within the closing angle range (270° to 90°), for example, as shown in FIG. Since the amount of light received is small,
A sorting circuit 58 receiving a corresponding electrical signal
is the closing angle range, and sends a command signal to the operating circuit 6 to select the solenoid valve 92BA of the high pressure circuit 93A.
Give to 0.

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, and the contact 61 of the electric line D is activated.
a is closed, solenoid 36a of three-way solenoid valve 36
is excited. Therefore, the three-way solenoid valve 36 is opened, and the pipe 37 and the air cylinder 33 communicate with each other. At the same time, the operating circuit 60 is activated by the output signal from the bistable multivibrator 59, and the relay 62 is activated based on the command signal from the sorting circuit 58. Therefore, the contact 62a of the electric circuit E is closed and the solenoid 92Aa of the electromagnetic valve 92BA is energized, so that the electromagnetic valve 92A in the high voltage circuit 93A is opened.

As a result, high pressure air regulated by the pressure regulating valve 91A to apply tension in the closing angle range is supplied into the air cylinder 33, and the outlet rod 34 protrudes and passes through the engaging body 35 to the easing lever. 6 and rotate it clockwise. Therefore, the tension applied to the warp yarns 2 via the back roller 3 increases, the position of the weaving cloth is adjusted, and weaving steps are prevented.

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

This starts the loom, and the action piece 48 causes the proximity switch 49 to send out a pulse each time the main shaft rotates once, so the count circuit 50
If the frequency division ratio of is set to 1/2, the second rotation, that is, 2
A signal is transmitted from the counting circuit 50 to the pick, and this signal causes the bistable multivibrator 5 to
Reset 9. Then, the output of the bistable multivibrator 59 becomes "0" and the relay 6
1 and 62 are demagnetized, and contacts 61a and 62a are opened. Therefore, the solenoid 36a of the three-way solenoid valve 36 and the solenoid 92Aa of the solenoid valve 92A are demagnetized, and these valves 36 and 92A are operated to close.

At this time, the air cylinder 33 is opened to the atmosphere by the three-way solenoid valve 36, the outlet rod 34 is retracted by the spring 38, the engaging body 35 no longer engages with the easing lever 6, and the easing lever 6 operates normally thereafter.

Also, when restarting the loom, if the restart angle of the loom is within the shedding angle range (90° to 270°), switch 40
At the stage when the disc 56 is closed, the highly reflective color-coded portion 56B faces the detector 57, and the detector 5
Since the amount of light received at 7 is large, the selection circuit 58 that receives the electrical signal corresponding to this determines that it is the aperture phase.
A command signal is given to the operating circuit 60 to select the solenoid valve 92B in the low pressure circuit 93B. Therefore, relay 61 and relay 63 are activated by the output signal from bistable multivibrator 59, and contact 61a
and the contact 63a, the three-way solenoid valve 36
The solenoid valve 92B in the low pressure circuit 93B is opened.

Therefore, in this case, the air cylinder 33 is supplied with pressurized air that has been regulated to a low pressure by the pressure regulating valve 91B to accommodate the application of tension in the opening angle range.
Therefore, the tension applied by the air cylinder 33 becomes slightly weaker and becomes optimal. Thereafter, the switch 42 is closed and the loom is started, and when a predetermined pick has passed, 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 G is opened, the relay 46 is inactivated, and the contact 46 is
a, 46b, 46c are opened and relays 41, 4
2's self-holding is also released, and the auxiliary equipment and main motor are also stopped.

In the above embodiment, two types of high-voltage and low-voltage circuits were used to change the applied tension, but it is clear that three or more types of circuits can be used to change the applied tension if necessary. be.

As explained above, according to the present invention, the restart angle detection means detects the restart angle of the loom, and the applied tension selects the state of the applied tension increasing means at the time of restart according to the detected restart angle. Since the change means is provided, the optimum applied tension can be obtained even when restarting from the closing angle range, the opening angle range, or any other angle range.This makes it possible to avoid the occurrence of weaving steps and to restart immediately after repair. It becomes possible to start the machine, and work efficiency is greatly improved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view of the main parts of a loom, FIG. 2 is a diagram of the pressure air supply system to the air cylinder in FIG. 1, and FIG. 3 is a diagram of the pressure air supply system in FIG. 2. FIG. 3 is an operating circuit diagram of a solenoid valve. 1... Warp beam, 2... Warp, 3... Cross roller, 6... Easing lever, 8... Tension spring, 33... Air cylinder, 35
... Engaging body, 36 ... Three-way solenoid valve, 56 ... Color-coded disc, 57 ... Detector, 58 ... Sorting circuit, 9
1A, 91B...Pressure regulating valve, 92A, 92B...Solenoid valve, 93A...High pressure circuit, 93B...Low pressure circuit, 94...Pressure air supply source.

Claims (1)

[Claims] 1 The warp threads 2 pulled out from the warp beam 1 are guided by the guide member 3 while applying a predetermined tension to guide them to the weaving front, while the loom operates for a predetermined time in response to a start signal of the loom to reduce the tension applied to the warp threads 2. In a loom that is provided with an applied tension increasing means 33 for increasing the applied tension, there are restart angle detection means 56 and 57 that detect the restart angle of the loom, and a detection signal from the restart angle detection means to determine the restart angle according to the restart angle. Applied tension changing means 91 for selecting the state of the applied tension increasing means 33
A weaving stage prevention device for a loom, characterized in that it is provided with A, 91B, 92A, and 92B.