JPH0367131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weaving step prevention device for preventing weaving steps from occurring at the weaving shed when the operation of a loom resumes, and in particular for canceling the movement of the weaving shed in response to the cause of the stoppage of the loom. This relates to a control method.

If the warp or weft threads break while the loom is running, the loom is automatically stopped. Appropriate repair work is required at this point.
For example, when the warp threads break, the loom stops in front of the weaving head, where repair work can be easily done, so when the loom is restarted from that stopped position, the initial reeling force has decreased, resulting in a slack row. . Therefore, the weaving bar prevention device applies a displacement in the backward direction to the tension roller on the sending side, thereby causing the weave to temporarily retreat, so that the initial reduction in beating force is compensated for by the position of the weave. ing.

On the other hand, when the weft yarn breaks, the loom is reversed to remove the defective yarn at the most retracted position (nearly 180 degrees), and then the yarn is moved to the reversing point (0) to enable new weft insertion. The machine is then reversed to a position exceeding 300 degrees (approximately 300 degrees), restarted, and the first Osa-uchi after startup is called Kara-uchi. At this time, since the weaving step prevention device is activated by receiving the operation start signal as input, it returns to its original state at the time of the first drafting, resulting in a state in which it does not affect the weave. This also results in the formation of weaving steps.

By the way, such inconvenience can be alleviated to some extent by attaching a timer to the weaving stage prevention device that operates in response to an operation start signal and setting the time point at which the retraction of the cloth opening is released at an appropriate time point. However, the position of the weaving opening at the time of beating changes slightly depending on the crank angle of the loom at the time of restart, the number of revolutions of the loom, especially its start-up characteristics, and the response speed of the control system.
Therefore, it is almost impossible to set a time that suits all causes of stoppage. Furthermore, since the time setting of the timer has nothing to do with the point of beating during the rotation of the loom, that is, the crank angle of the loom, it is not possible to obtain a sufficient weaving step prevention function. Also, when performing reverse alignment when stopping due to poor horizontal insertion,
Due to the frictional force between the fabric and the breast beam and the gripping force of the temples, the weave does not retreat sufficiently, resulting in slack in the fabric between the breast beam and the clothing roll, which causes loose layers. Sometimes it becomes.

Accordingly, an object of the present invention is to identify in advance the cause of the stoppage of a loom, and to control the loom prevention device in an appropriate state depending on the cause of the stoppage.

Based on the above object, the present invention distinguishes and stores the cause of a loom stoppage as a weft insertion defect and other accidents such as warp yarn breakage or manual stop, and in the case of a cause other than a weft insertion defect, after the first wefting. Release the retreat of the weaving opening, and if the weft insertion is defective, release the retreat of the weaving opening after the first reassembling, for example, after the second reassuring, and return the weaving opening. is selectively controlled depending on the cause of the stoppage.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The control method of the present invention will be specifically described below based on embodiments shown in the drawings.

First, FIG. 1 shows a weaving bar prevention device 1, which is the premise of the present invention, together with the path of warp yarns 2. As shown in FIG. That is, the warp yarns 2 are wound around a warp beam 3, change their direction with a tension roll 4, and intersect with the weft yarns 7 at the weaving opening 6 while forming an opening by the vertical movement of the heald 5. The cloth 8 is changed in direction by a breast beam 9 for widening, passes through a cloth roll 10 and a guide roll 11, and is wound onto a cloth roll 12.

The tension roll 4 is rotatably supported at one end of the tension lever 13.
It is swingably supported by its support shaft 14 and control lever 20. The other end of this tension lever 13 is connected to one end of a rod 16 with a tension spring 15 interposed therebetween, and the other end of this rod 16 is connected to a weight lever 17.
is connected to. This weight lever 17 is
One end is swingably supported by a support shaft 18, and the other end supports a weight 19. The control lever 20 is swingably supported at one end by a support shaft 21 such as a frame, and corresponds at the other end to a cylinder rod 23 of a cylinder 22 fixedly provided on the frame or the like. . This cylinder 22 is connected to a pressure source 24 with a pressure regulating valve 25 and an electromagnetic three-port switching valve 26 interposed therebetween. Also, this switching valve 2
The drive unit 27 of No. 6 is placed under the control of a control device 28.

The control device 28 includes memory circuits 29 and 30 such as flip-flops, a gate circuit 31, and an identification circuit 32 such as a counter or encoder. A filler signal Sa and a stop signal Sb other than the filler signal are input, and the state is stored until a necessary time after the loom is stopped. The identification circuit 32 identifies the output signals of the storage circuits 29 and 30 in relation to the timing of the loom and selectively outputs them, and is controlled by a timing signal St from a proximity switch 33, for example. . The proximity switch 33 corresponds to an object to be detected, such as a permanent magnet 35, provided on the crankshaft 34 of the loom. and gate circuit 3
1 confirms the existence of the memory outputs of the memory circuits 29 and 30, receives the operation signal So, starts the drive unit 27, and releases the activated state at the time of receiving the output from the identification circuit 32.

Next, with reference to FIG. 2, the operation of the weaving step prevention device 1 will be explained based on the control method of the present invention.

If an accident such as warp breakage or poor weft insertion occurs while the loom is operating, the loom's known safety devices will
Upon receiving that signal, the loom will automatically stop. At this time, the memory circuits 29 and 30 store the feeler signal
Sa or other stop signal Sb is stored, and the output signal level is changed depending on the storage state. During this period when the loom is stopped, necessary repair work corresponding to the cause of the stoppage is performed.

After that, when the "H" level operation signal So is input to start the loom, the gate circuit 31
The memory states of the memory circuits 29 and 30 are confirmed, the switching valve 26 is activated, and pressure fluid of a predetermined pressure value from the pressure source 24 is sent into the cylinder 22. At this time, the cylinder rod 23 temporarily lifts the tension roll 4 to increase the tension of the warp threads 2, and at the same time retreats the weaving opening 6 by an amount corresponding to the lack of beating force at the time of starting.

Now, when the cause of the stop is warp thread breakage or manual operation, that is, when the stop signal Sb is input,
The identification circuit 32 immediately cancels the output state of the gate circuit 31 when the timing signal St that appears first after the first stabbing after startup is input. Therefore, the inside of the cylinder 22 is the exhaust port 26a.
The cylinder 22 releases the displacement of the tension roll 4, returns the tension of the warp yarns 2 to the tension before stopping, and returns the weaving opening 6 to its normal position.

Also, when there is a weft defect, that is, the filler signal
When Sa occurs, the identification circuit 32 releases the holding state of the switching valve 26 upon receiving, for example, the second ting signal St after activation, and discharges the pressure fluid in the cylinder 22 to the outside. The exhaust crank angle is set to be about 20 degrees behind the 0 degree angle of the punching. In this way, the control device 28
The system distinguishes and stores the type of stop signal, and selectively controls the point at which the pressure fluid inside the cylinder 22 is exhausted depending on the cause of the stop.

The retraction speed of the cylinder rod 23 during exhaust can be set to an ideal slope by appropriately setting the diameter of the exhaust port 26a.

In case of accidents such as warp thread breakage,
Origuchi 6 until the first sashing after restarting is completed.
Since the retarder is moved back by the necessary amount, even if the retarding force at startup is reduced, the same retarding force as in the steady state can be obtained, thus preventing the occurrence of idle steps. It can be prevented. On the other hand, if the width insertion is defective, a reverse opening alignment operation is performed, but the cloth 8
Due to the frictional force between the breast beam 9 and the warp yarns 2 and the weave 6, the fabric 8 does not move back by an amount equivalent to one pitch reversal, and the fabric 8 becomes loose between the breast beam 9 and the clothing roll 10. However, since the timing of evacuation is held after the first draping and until the second draping is completed, the slack in the cloth 8 is stretched during that time, and the cloth opening 6 is will surely move to the upside down side by the number of weft threads that have been pulled out. After the second reeling, the weaving machine moves to its normal position and weaving is carried out under the constant rotation of the loom, so it is possible to reliably prevent the occurrence of weaving steps when the loom is restarted.

Incidentally, in the method of the above embodiment, in the case of a stop due to poor horizontal insertion, exhaust is performed after the second resting after startup, but the time of this exhaust may be after that.

In the present invention, the weaving shed is selectively returned to its normal position after restart depending on the cause of the loom stopping, so it is possible to control the weaving shed position in accordance with the cause of the stopping, and therefore the occurrence of a stopped stage is prevented. It can definitely be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the weaving bar prevention device when implementing the control method of the present invention, and FIG. 2 is a time chart during operation according to the control method of the present invention. DESCRIPTION OF SYMBOLS 1... Weaving step prevention device, 2... Warp, 4... Tension roll, 6... Weaving opening, 9... Breast beam, 10... Clothing roll, 20... Control lever, 22... Cylinder, 24 ...Pressure source, 26
...Switching valve, 28...Control device, 29,30...
Memory circuit, 31...gate circuit, 32...comparison identification circuit, 33...proximity switch, 34...crankshaft.

Claims (1)

[Claims] 1. The loom prevention device, which temporarily retracts the weaving shed when restarting operation, distinguishes and stores the cause of the loom's stoppage as faulty weft insertion or other accidents, and if the cause is other than faulty weft insertion, the device The retraction of the weave is canceled at the time when the first timing signal is generated after the reshaping, and when the weft insertion is defective, after the reshaping after the first reshaping,
A method for controlling a weaving step prevention device, characterized in that the retreat of the weaving opening is canceled at the time of generation of a second or subsequent timing signal.