JPH0465555A - Device for preventing weaving bar of loom - Google Patents

Abstract

PURPOSE:To prevent a cloth fell from occurring due to stopping and restarting of a loom by moving and correcting the position of the cloth fell according to the extent of fluctuation in the position of the cloth fell at the time of stopping and restarting the loom based on a positional signal outputted from a cloth fell positional sensor. CONSTITUTION:A loom is stopped by some reason during weaving. The cause for the stop is repaired and the loom is then restarted. In the process, the extent of fluctuation in the position of a cloth fell at the time of stopping or reopening the operation of the loom is determined based on a positional signal outputted from a cloth fell positional sensor constructed from a limit switch with a finger for mechanically sensing the cloth fell or a projector and receptor capable of optically sensing the cloth fell or an image sensor, etc. A delivery motor is driven and controlled according to the extent of fluctuation to move and correct the position of the cloth fell to the position at the time of stopping the loom. The operation of the loom is subsequently restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weaving stage prevention device for a loom, which reliably prevents weaving stages called a stop stage and a starting stage in a loom.

Conventional looms stop for various reasons during weaving, but when a stopped loom is restarted, weaving steps called a stop step and a start step may occur in the woven fabric during weaving. be. A stop stage is said to occur when the warp threads stretch while the loom is stopped, causing the position of the weave to fluctuate, while a start stage is said to occur when the reed beating force immediately after startup becomes smaller than a specified value. ing.

Therefore, in order to prevent these looms, when restarting the loom, one or both of the feed motor and take-up motor is driven in the opposite direction by a predetermined amount, and the looms are corrected and moved to an appropriate position. The technology is known (for example, Japanese Patent Application Laid-open No. 61-83355, Japanese Patent Application Laid-open No. 62-53452).
. All of these items are obtained by a predetermined amount or as a function of the loom stop time, taking into account the elongation of the warp threads while the loom is stopped, the decrease in beating force immediately after the loom is restarted, etc. By reversing the feed motor etc. by a fixed amount, the position of the weaving cloth can be optimally moved and corrected to prevent the occurrence of weaving steps.

Problems to be Solved by the Invention However, when using such conventional technology, it is difficult to optimally set the amount of movement correction of the cloth sleeving position by the feed-out motor, etc., and it is difficult to completely prevent the occurrence of cloth stacks. There was a problem.

In other words, the amount of elongation of the warp threads while the loom is stopped is generally determined not only by the time the loom is stopped, but also by many factors such as the type of warp threads, the warp tension while the loom is stopped, and the temperature and humidity of the atmosphere. This is because it must be said that it is almost impossible to optimally set the amount of movement correction of the fabric cloth by the feed-out motor, etc., taking all of these into consideration.

SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to provide a woven cloth front detection device and a control circuit for moving and correcting the cloth front position based on a cloth front position signal from the cloth front detection device. An object of the present invention is to provide a weaving step prevention device for a loom, which can optimize the drive amount of a delivery motor, etc., and reliably prevent the occurrence of weaving steps.

Means for Solving the Problems The configuration of the present invention for achieving the above object includes a cloth front detection device for detecting the cloth front position of the woven fabric, and a cloth front position signal from the cloth cloth front detection device. The gist thereof is that the control circuit comprises a control circuit that moves and corrects the position of the cloth according to the amount of variation in the position of the cloth between the time of stopping and the time of restarting operation.

The fabric detection device includes a limit switch with a finger that mechanically detects the fabric, a drive mechanism that drives the limit switch between the retracted position and the operating position, and a position detector that detects the horizontal position of the drive mechanism. In addition, the limit switch at this time can be replaced with a light emitter/receiver that optically detects the cloth. Furthermore, the control circuit may include a setting device for presetting the regular cloth vellum position.

Further, the woven fabric detecting device may include an image sensor that optically detects the woven fabric position, and a drive mechanism that drives the image sensor to a retracted position and an operating position.

Operation With this configuration, the loom detection device is capable of detecting the loom position of the woven fabric, so it is activated when the loom stops and when the loom resumes operation, so that the loom detection device can detect the loom position of the woven fabric. By measuring the front position, it is possible to obtain the amount of variation in the front position at the same time. Therefore, the control circuit changes the position of the cloth according to the amount of variation in the position of the cloth.
Since the loom can be accurately returned to its normal position at the time of stopping, the occurrence of a stop stage can be effectively prevented. In addition, at this time, taking into consideration the decrease in the beating force immediately after the loom starts, it is possible to prevent the occurrence of the starting step by moving and correcting the weaving front position so that it is somewhat beyond the position at the time the loom stops. It is possible.

When the weave detection device is equipped with a limit switch with a finger, the finger is inserted between the warp threads and the limit switch is moved along the warp threads via a drive mechanism, and the finger comes into contact with the weave thread and the limit switch is activated. By reading the horizontal position of the drive mechanism at the moment it operates,
The position of the cloth can be easily detected.

Furthermore, when a light emitter/receiver is provided in place of the limit switch, the cloth front position can be detected in the same manner based on a change in the light reception level of the light receiver.

When the control circuit is equipped with a setting device for setting the regular cloth cloth position, the amount of variation in the cloth cloth position can be found from the contents of this setting device and the cloth cloth cloth position at the time of resuming operation. The pre-detection device does not need to be activated when the loom is stopped, and only needs to be activated when the loom is restarted. In addition, the regular weaving position set on the setting device can include in advance the movement correction amount of the weaving position necessary to prevent the starting stage, and in this case, not only the stopping stage but also the starting stage. It is also possible to prevent the occurrence of steps.

When the cloth front detecting device has an image sensor, the image sensor can directly optically detect the cloth cloth position, so that the cloth cloth detecting device does not need to use an encoder together.

Example Examples will be described below with reference to the drawings.

The weaving step prevention device of a loom consists of a weaving head detection device 10 and a control circuit 20 (FIG. 1). Encoder EN as a device and limit switch LS
and a sequence control circuit 12.

In the loom, the warp Wa from the warp beam B1 is pulled out via the tension roll B2 (Fig. 2), and the heald SD,
The upper thread Wal and the lower thread Wa2 are opened by SD, and a weft (not shown) is inserted into the opening Wa3 to form a woven fabric W. The woven fabric W is passed through a winding roll B3 to a fabric beam B.
It is designed to be wound up in steps 4. The loom is equipped with a reed R for driving the weft into the woven fabric WF, and the reed R is connected to the main shaft M.
It is linked to S. A main motor (not shown) and an encoder ENI that detects the rotation angle θ of the main shaft MS are connected to the main shaft MS.

The take-up roll B3 is driven by a take-up motor M2, and the take-up motor M2 is rotationally driven to follow the main shaft MS via a take-up control device M2a that inputs the rotation angle θ of the main shaft MS from the encoder ENI. Ru. The winding control device M2a extracts, for example, a pulse signal of the least significant bit among the multiple bit signals indicating the rotation angle θ of the main shaft MS, and controls the winding motor M2 according to the number of input pulse signals.
drive the rotation. Moreover, a load cell B2a that detects the tension T of the warp yarns Wa is attached to the tension roll B2. Therefore, it is assumed that the warp beam B1 is rotationally driven by the delivery motor M1 via the delivery control device Mla which inputs the tension T so that the tension T of the warp thread Wa is constant.

The limit switch LS is attached to the tip of an arm llb that is driven in the vertical and longitudinal directions via the drive mechanism 11 (FIG. 3). Also, limit switch L
A finger LSI is vertically installed near S. The arm llb has a lowered position in which the tip of the finger LSI is inserted at least below the woven fabric W into the opening WaS created by the upper thread Wal and the lower thread Wa2 by a drive source built into the drive mechanism 11; The finger LSI can move up and down between the raised position where it is fully removed from the opening Wa3 (in the direction of arrows Kl and K1 in the same figure), and the finger LSI can also move up and down between the warp thread Wa consisting of the upper thread Wal and the lower thread Wa2. It can move forward and backward along the arrow 2 in the same figure, direction K2. Further, the finger LSI is assumed to be able to swing toward the limit switch LS around its base end by abutting the front end of the finger LSI against the fabric WF, thereby activating the limit switch LS. Note that the finger LSI may be elastically curved toward the limit switch LS.

The encoder EN is attached to the drive mechanism 11, and when the arm llb moves back and forth in the direction of the arrow 2 and K2 in FIG. 3, it detects the horizontal position be able to.

The control circuit 20 includes a flip-flop 21 and a WEtM device 2.
2.23, a subtractor 24, and a controller 25 (first
), the fabric position signal Sx from the encoder EN is input to the memory devices 22 and 23. The outputs of the memories 22 and 23 are connected to the delivery motor M1 via a subtracter 24 and a controller 25. It is assumed that the encoder EN detects the horizontal position X of the arm llb when the drive mechanism 11 moves the arm llb in the front-back direction.

Set terminal S1 of flip-flop 21 Reset terminal R
The loom stop signal S from the loom operating circuit (not shown) is
a and the loom operation signal sb are input, and the loom stop signal S
a. The loom operating signal sb is also branched into the sequence control circuit 12.

Further, the output of the sequence control circuit 12 is transmitted to the drive mechanism 11.
It is connected to the.

The output terminal Q and the inverted output terminal q of the flip-flop 21 are connected to a memory 22.23 via AND gates 22a and 23a, respectively, and the AND gates 22a and 23a receive an activation signal Ss from the limit switch LS. are also entered. The actuation signal Ss is also branched into the sequence control circuit 12,
The output of a is connected to the controller 25 via a timing element 26.

It is assumed that the delivery motor M1 is connected to the control circuit 20 by a switching circuit (not shown) when the loom is stopped, and is connected to the delivery control device Mla while the loom is in operation.

Now, when the loom is operating normally, the warp threads Wa are controlled to rotate in the forward direction by controlling the winding remoter M2 and the delivery motor M1 in the forward direction via the winding control device M2a and the delivery control device M1a. The cloth is sent out while maintaining a predetermined tension T, and the position of the cloth front WF is maintained at the regular cloth front position XO. However, the position of the woven fabric WF is the warp Wa, the woven fabric W
The arm ll of the fabric detection device 10 moves back and forth along the
It shall be displayed according to the horizontal position X of b (Fig. 3)
.

Furthermore, while the loom is in operation, the arm llb is raised to the raised position by the drive mechanism 11, and is sufficiently retreated toward the woven fabric W to reach the retracted position where the limit switch LS and finger LSI do not interfere with the reed R. It shall be evacuated.

When the loom stops for some reason, a loom stop signal Sa is output, and the delivery motor M1 is disconnected from the delivery control device Mla and connected to the control circuit 20 via a switching circuit (not shown).

The loom stop signal Sa is input to the sequence control circuit 12 of the loom detection device 10 and the flip-flop 21 of the control circuit 20, starts the sequence control circuit 12, and sets the flip-flop 21.

The sequence control circuit 12 starts the drive source built in the drive mechanism 11 according to a predetermined operation sequence, and controls the arm l.
lb is advanced to the forward limit and lowered to the lowered position, and the limit switch LS is moved to the operating position. At this time, the finger soil St moves forward to the opening Wa3 side beyond the woven fabric WF, and its tip is connected to the upper thread Wal.
, it is inserted into the bobbin thread Wa2 and goes down below the woven fabric W, so if the arm llb is subsequently retreated, the finger LS1 comes into contact with the woven fabric WF and the limit switch LS can be activated. The activation signal Ss of the limit switch LS is sent to the sequence control circuit 12, so that the sequence control circuit 12
b can be stopped, and the encoder EN can detect the horizontal position X of the arm 11b at that time and output it as the loom position xi at the time when the loom is stopped.

In general, the loom WF does not change when the loom is stopped, so the loom position x1 at this time coincides with the regular loom position xO during operation of the loom.

On the other hand, in the control circuit 20, the flip-flop 21
is set, the AND gate 22a opens, and when the limit switch LS is activated, its activation signal S
s reaches the memory 22 via the AND gate 22a. Since the loom position signal Sx from the encoder EN is input to the memory device 22, the memory device 22 can store the loom position X1 at the time when the loom is stopped in accordance with the operation signal Ss. .

The sequence control circuit 12 then raises the arm llb via the drive mechanism 11, removes the finger LSI upward, and sufficiently retreats the arm llb to retract the limit switch LS and the finger LSI to the retracted position. This is to avoid interference with the reed R when rotating the loom forward or reverse during search for the cause of the loom's stoppage or repair work.

Subsequently, when the weaver corrects the cause of the loom's stoppage and instructs the loom to be ready to restart, the loom operating signal sb is output from the loom's operating circuit.

The sequence control circuit 12 operates according to the loom operation signal sb.
Arm llb is moved forward again and lowered, limit switch LS is placed in the operating position, and then arm llb is moved forward and lowered.
When lb is moved backward, the encoder EN when the limit switch LS is activated can output the cloth cloth position X2 at that time as the cloth sheet position signal Sx, in exactly the same way as described above. On the other hand, the textile position signal Sx is stored in the memory 2.
3, and the flip-flop 21 is
Since it is reset by the loom operation signal sb, the actuation signal Ss from the limit switch LS reaches the memory device 23 via the AND gate 23a, and therefore the memory device 23 can store the loom position x2. can. Note that the loom position x2 at this time is the position of the loom WF at the time when the loom operation signal sb was output, so it is the loom position at the time when the loom operation is restarted. Therefore, the subtractor 24
is the orimae position xi stored in the memory device 22.23
.

Subsequently, the sequence control circuit 12 retracts the limit switch LS to the retracted position in response to the limit switch LSI near) activation signal Ss, while the controller 25 responds to the activation signal Ss input via the time element 26. hand,
Drive control of the delivery motor M1. However, time limit element 2
6 defines the margin time for calculating the amount of variation ΔX of the cloth front position. Therefore, the controller 25 rotationally drives the delivery motor M1 so that the cloth front WF moves by an amount corresponding to the fluctuation amount ΔX of the cloth front position.
can be moved and corrected to the front position x1 at the time when the loom is stopped. Therefore, if the operation of the loom is resumed thereafter, the occurrence of weaving steps due to movement of the weaving front WF while the loom is stopped can be reliably prevented.

In addition, since the warp thread Wa generally stretches while the loom is stopped,
The woven fabric WF tends to move toward the woven fabric W side. Therefore, if the horizontal position By doing so, the movement of the Orimae WF can be appropriately corrected.

In the above description, the encoder EN was used as a position detector for detecting the horizontal position of the drive mechanism 11, but instead of this, a known position detector such as a potentiometer or an inductosyn can be used.

Another embodiment of the control circuit 20 has an addition point 24a interposed between the subtracter 24 and the controller 25, and the addition terminal is connected to the setter 24.
b can be connected (Fig. 4). In addition to the amount of variation ΔX in the weave position, the setting device 24b can set a correction amount δX for preventing the startup stage, and at this time, the controller 25 adjusts the amount of feedout corresponding to (Δχ+δX). The motor Ml can be driven in reverse (FIG. 5). Therefore, the loom WF can be moved and corrected beyond the loom position x1 at the time the loom stops, to x3 = xl - δX,
By appropriately setting the correction amount δX, it is possible to effectively prevent the startup stage due to insufficient striking force immediately after startup.

The memory 22 of the control circuit 20 can be replaced with a setting device 27 (FIG. 6). The setting device 27 is preset and stored with the regular loom position xo during operation of the loom, that is, the loom position x1 at the time the loom is stopped, and the sequence control circuit 12 is configured to store the loom operating signal sb. Enter only.

Prior to restarting the loom, the loom operation signal sb
If the limit switch LS is moved to the operating position and the loom position x2 at the time when the loom resumes operation is stored in the memory device 23,
Hereinafter, in the same way as in the previous embodiment, the subtractor 24 calculates the amount of variation ΔX = can do.

At this time, if (xi-δX) is set in the setter 27, the output of the subtracter 24 is ΔXx2-(xi-δ
Since x)=(x2-xi)+δX is obtained, it is also possible to prevent the occurrence of the startup stage.

The limit switch LS of the fabric detection device 10 can be replaced with a light emitter/receiver PS that optically detects the fabric fabric (FIG. 7). The light emitter/receiver PS is, for example, a light emitter PSl.
This is a transmission type photoelectric switch consisting of a light receiver PS2 and a light receiver PS2, and its optical axis can vertically pass through the opening Wa3 and the woven fabric W in the operating position. When moving the emitter/receiver PS back and forth via arm llb (see the arrow 2 in the figure)
, K2 direction), the light reception level of the photoreceiver PS2 changes significantly before and after the Orimae WF, so the actuation signal Ss is obtained by processing the output signal of the photoreceiver PS2 via an appropriate signal processing circuit PSa. be able to.

The cloth front detecting device 10 converts a one-dimensional image signal along the warp Wa consisting of the upper thread Wal and the lower thread Wa2, or a two-dimensional image signal including the warp W and a weft (not shown) into a cloth front position signal Sx.
You may also use an image sensor MG that outputs as (
Figures 8 and 9).

When the loom stop signal Sa is output, the arm 11b is moved forward, the image sensor MG is set at a predetermined operating position where the loom WF is included in the field of view of the image sensor MG, and the loom position signal Sx at that time is read. It is stored in the storage device 22. Note that the output of the sequence control circuit 12 is input to the memory 22 in order to detect that the image sensor MG is correctly set to the operating position. Next, arm 1
1b is retracted, the image sensor MG is retracted to the retracted position 1, and the cause of the loom stoppage is repaired.

When the loom operation signal sb is output, the image sensor MG
Set it to the working position again. Since the cloth position signal Sx at that time is input to the comparator 28, the comparator 28
By comparing the stored contents of the memory device 22 and the current cloth front position signal Sx, the amount of variation ΔX in the cloth front position can be found. Therefore, the controller 25 can correct the position of the cloth cover WF by driving and controlling the delivery motor M1 so that the variation amount ΔX of the cloth cover position from the comparator 28 is eliminated. Note that the sequence control circuit 12
From then on, another output is input to the controller 25, and the controller 25 determines when, for example, the image sensor MG is reset to the operating position by the loom operating signal sb and the output of the comparator 28 is properly obtained. The operation shall begin at .

Note that in this embodiment, the comparator 28 is connected to the memory 22
The storage contents and the cloth position signal Sx input to the comparator 28
You may also compare the video signals as they are. Since the comparator 28 can output as a binary signal whether or not the two match, the controller 25 can control the delivery motor M1 in response to this.

In the above explanation, the movement of the fabric WF can be corrected not by the delivery motor M1 but also by a dedicated correction motor Mwl (FIG. 10). However, in this case, the delivery motor M! , the correction motor Mwl is an electromagnetic clutch C
It is assumed that it is selectively connected to the warp beam Bl via Ll and CL2. It goes without saying that the warp beam Bl at this time may be mechanically connected to the main shaft MS without using the feed-out motor Ml.

Note that the control target of the control circuit 20 may be the take-up motor M2 instead of the feed-out motor M1.

Furthermore, both the feed motor Ml and the take-up motor M2 may be controlled. Further, a correction motor similar to the correction motor Mwl can be used for the winding motor M2, and in that case, the winding roll B3 can be selectively moved between the winding motor M2 and the correction motor. Just connect them.

In addition, in an example in which the loom position is measured both when the loom stops and when the loom resumes operation, the measurement conditions such as the warp tension and the loom stopping angle when measuring the loom position are It is preferable to match both the time and the restart time, as this allows for more precise control. For this purpose, a control device is installed to match the warp tension to the target tension, and a control device to match the stopping angle of the loom to the target stopping angle, and the position of the loom is measured at the time of restarting operation. Prior to this, these control devices are operated to control the warp tension and the stopping angle of the loom.
The warp tension and stop angle may be the same as when the cloth front position was previously measured when the loom stopped. Thereafter, the loom can be rotated to a predetermined starting angle and operation can be resumed. Of course, the loom position also moves in synchronization with the operation of rotating the loom to the starting angle.

Furthermore, in an embodiment in which the loom position is measured only when the loom resumes operation, the preset regular loom position is determined based on the loom position under a predetermined starting angle of the loom and a target warp tension. Then, before restarting operation and measuring the loom position, the loom is stopped at this predetermined starting angle, and after the warp tension is made to match the predetermined target warp tension, Similarly, more precise control can be achieved by measuring the position of the fabric front.

As described in detail, according to the present invention, the amount of variation in the loom position between the time when the loom stops and the time when the loom resumes operation is determined based on the loom detecting device and the loom position signal from the loom detecting device. By providing a control circuit that moves and corrects the position of the front cloth according to the loom, the control circuit can optimally correct the position of the front cloth corresponding to the amount of variation in the actual front position while the loom is stopped. This has an excellent effect in that it is possible to accurately prevent weaving steps from occurring in the woven fabric when the loom is stopped and restarted.

[Brief explanation of the drawing]

1 to 3 show an embodiment, in which FIG. 1 is an overall system diagram, FIG. 2 is a conceptual diagram of the structure of the loom, and FIG. 3 is an explanatory diagram of the main part structure. 4 and 5 show other embodiments, FIG. 4 is a system diagram of main parts, and FIG. 5 is an explanatory diagram of operation. 6 and 7 show different embodiments, respectively, with FIG. 6 being a diagram corresponding to FIG. 1, and FIG. 7 being a diagram corresponding to FIG. 3. 8 and 9 show still other embodiments, with FIG. 8 being a diagram corresponding to FIG. 3, and FIG. 9 being a diagram corresponding to FIG. 1. FIG. 10 is a conceptual diagram of the main part configuration showing still another embodiment. W...Woven fabric WF...Weave X...Horizontal position xo, xi, x2, x3...Weave position ΔX...Weave position variation amount SX...Weave position signal EN ...Encoder LS...Limit switch LSI...Finger PS...Light emitter/receiver MG...Image sensor 10...Orimae detection device 11...Drive mechanism 20...Control circuit 27...・Setting device

Claims (1)

[Scope of Claims] 1) A weaving front detection device for detecting the weaving front position of the woven fabric, and a weaving front position based on the weaving front position signal from the weaving front detection device at the time when the loom stops and when the operation restarts. A weaving step prevention device for a loom, which comprises a control circuit that moves and corrects the position of the weaving bed in accordance with the amount of variation in the weaving stage. 2) The weave detection device includes a limit switch with a finger that mechanically detects the weave, a drive mechanism that drives the limit switch between a retracted position and an operating position, and a horizontal position of the drive mechanism. 2. A weaving step prevention device for a loom according to claim 1, further comprising a position detector. 3) The cloth front detection device includes a light projector/receiver that optically detects the cloth front, a drive mechanism that drives the light projector/receiver to a retracted position and an operating position, and a position that detects the horizontal position of the drive mechanism. A weaving step prevention device for a loom according to claim 1, characterized in that the device comprises a detector. 4) The weaving step prevention device for a loom according to claim 2 or 3, wherein the control circuit includes a setting device for presetting a normal sleeving position. 5) The cloth cloth detecting device comprises an image sensor that optically detects the cloth cloth position, and a drive mechanism that drives the image sensor to a retracted position and an operating position. A loom step prevention device for a loom according to item 1.