JP3487502B2 - Method and apparatus for preventing weaving steps of loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing a weaving step by correcting the position of the weaving cloth in the front-rear direction according to the opening state of the warp when the loom is stopped.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 60-155757 discloses a technique for preventing a weft bar by rotating a delivery beam in a forward or reverse direction by a preset amount of rotation when starting a loom. .

According to the above technique, in the case of weaving with a 1/2 twill weave, any one of the three warp sheets passed through the heddle frame at the warp cross timing of each opening cycle of one repeat is: Always maintained in the upper opening position. Therefore, from the moment the loom is stopped, the position before the weaving is displaced in correspondence with the opening mode of the warp. The warp tensions of the respective warp sheets and the acting directions of the tensions of the respective heald frames differ between the opening cycles due to the difference in the front and rear positions. For example, when stopped in a specific shed cycle, even if the weft prevention technology prevents the generation of a weft (stop), when stopped in another shed cycle and waited,
Since the degree of displacement of the position of the cloth fell differs due to the difference in the warp tension and the acting direction of each warp sheet, there is a problem that the stop stage cannot be eliminated under the same drive amount setting.

Further, Japanese Laid-Open Patent Publication No. 7-54244 discloses a twill design similar to that described above, and by stopping at a specific opening cycle, the force acting on the warp yarns is set to a desired state and the weaving step is eliminated. is doing. According to this technique, the weaving steps can be eliminated, but the operation (orientation) before starting is complicated and is not practical.

Further, in Japanese Patent Laid-Open No. 3-227340, at the time of starting the loom, at least one of the feed motor and the take-up motor is driven based on a target kickback amount preset corresponding to the starting angle of the loom. A kickback control method for a loom (weaving bar prevention technology) is disclosed.
According to this technique, while the weaving bar due to the difference in the starting position can be eliminated, the weaving bar due to the opening state of the warp, for example, the difference in the shed cycle, cannot be eliminated in the stopped state. Generally, the heddle frame is set to have a larger opening amount as it goes away from the weaving position, so that depending on which heddle frame among the heddle frames arranged along the warp path opens the upper shed / lower shed, The force and direction acting on the will change, and the situation of the weaving bar will change accordingly. For this reason, the technique cannot effectively deal with such a weaving situation.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to take into consideration the force acting on the cloth fell when the loom is started in the previously stopped state, that is, the warp opening mode,
By correcting the position of the cloth fell, it is possible to surely prevent the weaving step (stop step).

[0007]

Based on the above-mentioned object, the present invention provides, as a weaving step prevention method for a loom, an opening device having heddle arranged in a plurality of rows along a warp path, and a weaving cloth. In a loom having a member whose front position can be corrected,
When the loom is stopped, the warp shed mode when the warp shed is in a stationary state is obtained, and when the loom is started, the member is driven based on the drive amount set corresponding to the obtained warp shed mode. Then, the position of the cloth fell is corrected.

Here, the above-mentioned opening device drives the heddle fixed to the heddle frame by driving the heddle frame, or directly as in the Jacquard device, without using the heddle frame. To drive. These heddle frames are arranged along the warp running route and in a plurality of examples in the direction intersecting with the warp running route. During the shedding motion, these heddle frames are driven simultaneously for each row. The opening device is configured as a mechanical opening device that is connected to and driven by the main shaft, or as an electric opening device that is driven by an independent actuator.

The opening mode of the warp is recognized by the following three means: (a) opening pattern, (b) opening height, and (c) combination of opening pattern and opening height. In addition, the opening mode here reflects a force acting before weaving, that is, a working condition such as a direction and a size of the warp tension, and can also be expressed as a warp opening condition.

(A) The opening mode of the warp is recognized from the opening pattern in the stopped state. Here, the opening pattern is
This is information indicating whether the target heddle belongs to the upper mouth / lower mouth opening. The heddle row of interest is weighted without weighting or according to, for example, the order close to the texture, and is specified as one specific row, two or more specific rows, or a combination of two or more specific rows, or all the rows. The aperture pattern can be captured. In addition, in detecting the opening mode of the warp, detailed information of the opening state (upper / lower opening distinction)
Is required.

The opening pattern is detected by a sensor as to whether the heddle is on the upper mouth or the lower mouth, or on the electronic Dobby / Jacquard / motorized opening device based on a drive command related to the opening movement. I could not recognize that the opening amount (opening height) changed due to the loom stop position shifting,
This is because there is a discrepancy between the set amount and the actual opening state.

Since the opening device is driven in synchronization with the main axis, if the stop position is constant, the opening pattern, in other words, the drive amount set corresponding to the pattern, and the actual opening state (opening direction and Since the opening amount has a one-to-one correspondence, as a result, it is possible to set the drive amount corresponding to the opening mode, and by setting this drive amount, it is possible to prevent the weft. Further, by using an opening step number instead of the detailed information on the opening state as the opening pattern, it is possible to prevent the weaving step in the same manner as described above. This is because these opening step numbers are the information that is the basis for outputting the opening motion drive command, and correspond to the detailed information of the above-mentioned opening state, in other words, the actual opening state, one to one. is there.

(B) The opening mode of the warp is recognized from the opening height of the warp. The opening height of the warp is targeted at the position of the heddle (mail), and is obtained, for example, from the position relative to the position at the time of opening the middle opening. The opening height is detected by using a sensor or calculated. The sensor detects the position of a member, such as a heddle, which is displaced along with the opening movement.
For example, a heddle as a detection target, a heddle frame for fixing the heddle, a motion transmission means (rod, wire), a mechanism for driving the same (a mechanism for converting a rotary motion into a reciprocating motion), and the like.
Further, the calculation is obtained from the main shaft angle and the setting (cross point / opening curve) related to the opening device.

The heddle row of interest is one particular row, two or more particular rows, or all the rows. Similar to the above, the reason why the opening height is detected and focused is that when the loom stop position (angle) changes due to secular change of the loom, the opening height changes and the condition of the weaving bar also changes. . Therefore, since the opening amount is directly and accurately detected, there is no problem that the driving amount becomes excessive or insufficient due to the shift of the stop position as described in (a) above.

(C) Furthermore, the opening mode of the warp can be recognized by combining the recognition means of (a) and (b).

The term "when the warp shed is in a stationary state" means a state in which the shed motion of the warp remains stationary and is not displaced. Specifically, the weaving stand-by state in which the main shaft does not rotate, the weft insertion error yarn removal, and the warp yarn are performed. Includes a stopped state at a specific phase for repair such as repair. These states can be recognized by the state signal given from the loom side.

A member driven to correct the position of the cloth fell may be a member on the winding side (rotation of the winding roll), a member on the delivery side (rotation of the delivery beam, displacement of the tension roll), and the like. The drive amount to be set is at least one in the plus or minus direction, including the case where either is set to zero.

The setting of the drive amount is set in accordance with the passage of time, and the elapsed time of the stationary state of the opening is integrated so that when the loom is started, the member is set based on the drive amount corresponding to the integrated time. It can also be driven.

The present invention can be processed in the field of software by a computer, and is specified as a weaving bar preventing method for a loom as described above, and is also configured as a weaving bar preventing device for a loom based on this method. It

The weaving bar preventing device of the loom comprises an opening device for driving the healds arranged in a plurality of rows along the warp path, an opening status signal output means for generating a signal corresponding to the opening status of the warp, and the opening. A drive amount output device comprising a drive amount setting device for setting a drive amount corresponding to a situation signal and a drive amount output device for outputting the drive amount set by the drive amount setting device in response to the warp yarn opening condition signal. Means, and a cloth fell position correcting means for correcting the cloth fell position of the woven fabric according to the output of the driving amount output means, wherein the driving amount output means receives a loom state signal and a start signal, When the loom state signal is input, the drive amount corresponding to the input of the warp shed state signal is read and stored, and when the start signal is input, the stored value is output as the drive amount.

Whether the shed condition signal output means outputs a signal corresponding to the shed condition based on a shed pattern signal corresponding to the heddle of at least a specified row among a plurality of rows in accordance with the rotation of the main shaft of the loom. , Or the position of the member that is displaced with the opening movement is obtained, and a signal corresponding to the opening situation is output based on the obtained position.

The drive amount corresponding to the stop time is preset in the drive amount setting device, and the drive amount output device integrates the stop time of the loom according to the input of the loom state signal, and the start signal of the loom. At the time of input, the drive amount corresponding to the integrated result can be output as the drive amount.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of a loom 1. The warp yarn 7 is wound around the delivery beam 2,
By the rotation of the feeding motor 3, the tension roll 4 is brought into contact with the tension roll 4, the dropper 5 is passed through the healds 9 arranged in a plurality of rows, and the vertical movement of these healds 9 forms an opening 6, and the inside of the opening 6 is formed. Then, the woven fabric 10 is crossed with the wefts 8 and beaten by the reeds 12 on the front 11 of the weave. Then, the woven fabric 10 is wound around a cloth winding roll 15 via a winding roll 13 driven by a winding motor 14. The tension of the warp yarn 7 is detected as an electric signal by the tension sensor 16 such as a load cell at the position of the tension roll 4.

The drive motor 17 also drives the main shaft 18. According to this specific example, the main shaft 18 imparts a repulsive movement to the reed 12 through a mechanism 19 that converts a rotational movement into an oscillating movement, and through the opening device 20, to the healds 9 arranged in a plurality of rows. Gives a vertical reciprocating motion.

FIG. 2 shows the structures of the winding drive device 21 and the delivery beam drive device 22 in relation to the main controller 23 and the drive amount output means 24. Main controller 23
Generates an operation / stop signal and sends it to the drive amount output means 24, the winding control device 25 in the winding drive device 21, and the delivery control device 26 in the delivery beam drive device 22 as well as a start signal and a stop signal. State signal for driving amount output means 2
Send to 4. Further, the drive amount output means 24 receives a signal from the opening state signal output means 27 and generates a drive amount signal in addition to the completion signal, and adds the output side of the winding control device 25 and the delivery control device 26. A signal of a predetermined drive amount is sent to points 28 and 29.

Then, the winding control device 25 uses the spindle 18
A rotation amount sensor 30 such as an encoder connected to the main shaft 18 for driving the winding roll 13 in accordance with the rotation amount corresponding to the driving density set in synchronization with the rotation of
From the main shaft rotation angle (crank angle) θ and the driving density signal set by the density setting device 31 to generate a rotation command signal, and drive the amplifier 32 with the rotation command signal. The winding motor 14 is driven. The rotation of the take-up motor 14 is controlled by the encoder 3
3 and is fed back to the amplifier 32.

Further, the delivery control device 26 drives the delivery beam 2 so as to eliminate the tension deviation with respect to the target tension during the operation of the loom 1, so that the target tension setting device 3
The signal of the target tension set in 4 and the signal of the tension of the warp yarn 7 detected from the tension sensor 16 are input, a speed signal is generated under PID control, and the amplifier 35 is driven by this speed signal. , Controls the rotation of the delivery motor 3.
The rotation of the feed motor 3 is detected by the encoder 36 and fed back to the amplifier 35.

In this example, the winding drive device 21 and the delivery control device 26 are both electrically driven, but may be constructed as a mechanical device. For example, when the winding device is mechanical, the mechanical winding drive device is disconnected from the mechanical drive system only before the weaving machine 1 is started and during the weft bar preventing operation. At this time, the winding control device 2
In order to prevent the weaving bar, No. 5 drives a dedicated motor corresponding to the winding motor 14 to perform the necessary drive for preventing the weaving bar. The same applies to the sending device.

The drive amount output means 24 constitutes a control portion of the opening device 20, and the drive amount output means 24, the opening condition signal output means 27, and the winding drive device 21.
The delivery beam driving device 22 forms a main part of the weft bar preventing device 40.

FIG. 3 shows the inside of the drive amount output means 24 and the opening condition signal output means 27. The heald frame sensor 37 inside the opening condition signal output means 27 is a heald frame 39.
In order to detect whether or not it exists at the height position of the upper mouth, that is, the upper mouth opening (including the middle mouth position), it is provided on the side of the heddle frame 39, and when the upper mouth opening (including the middle mouth position) At the same time, the heald frame 39 is detected and an ON signal is generated. Further, since the heald frame 39 is not detected when the lower mouth is opened, an OFF signal is generated and sent to the opening status signal generator 38. The opening condition signal generator 38 generates an opening condition signal (opening position signal) according to the height position of the heddle 9 and sends it to the drive amount output device 41 inside the drive amount output means 24.

The drive amount output device 41 discriminates two regions vertically divided from the middle position of the heddle 9 in the stopped state, that is, an upper opening (middle position) and a lower opening. ,
A drive amount signal is generated in accordance with the drive amount set by the drive amount setting unit 42, depending on where the heald 9 in the stopped state exists. In addition, in FIG. 3, the heald frame sensor 37 is illustrated as if there is only one, but it may be provided at each of the upper and lower positions. Further, the heddle frame sensor 37 can be provided in each of the plurality of heald frame 39, and the detection output from each heald frame sensor 37 is sent to the opening condition signal generator 38 as in the above. The opening condition signal generator 38 can output a signal corresponding to each combination of outputs as an opening condition signal, and can output a corresponding driving amount from the driving amount output device 41.

The stop state signal input to the drive amount output device 41 is output when the loom 20 is stationary while the loom is stopped. For example, the loom 1 is stopped and the heddle frame 39 is stopped. It is output in the so-called weaving waiting period from the stop to the start of the first operation (reverse rotation). The activation signal is
The signal is output as an ON signal when the operation of preventing the weft bar is started before the operation is started. Further, the operation / stop signal is output as an ON state while the loom is in operation, and is used as a signal for prohibiting the weft bar preventing operation during operation.

FIG. 4 shows a time chart from the stop to the start of the loom 1. When the operation signal changes during the operation of the loom 1 and a stop signal (stop pulse) is generated, under the control of the main controller 23, the loom 1 (driving motor 1
In 7), the rotation speed is reduced, and then it stops. Loom 1
In the stopped state, the opening state signal output means 27 detects the position of the heddle 9 by the heald frame sensor 37 and reads the opening state when the stop state signal is turned on from the main controller 23. Drive signal output device 41
Send to.

After a stationary state such as a weaving waiting period,
The stop status is read, and the weaver performs reverse rotation, repair, reverse operation, etc. in order to remove the cause of the stop, removes the cause of the stop, sets the restartable state, and gives a loom start command.

The drive amount output device 41 starts the operation of preventing the weft bar from the time when the loom start command (start pulse) is received from the main controller 23, and outputs the corresponding drive amount based on the input of the shed condition signal. When a loom start command (start pulse) is read from the drive amount setting device 42, a signal corresponding to the read drive amount is sent to the winding drive device 21 and the delivery beam drive device 22.

Therefore, the take-up drive device 21 and the feed-out beam drive device 22 control the feed-out motor 3 and the take-up motor 14 as shown by the solid line of the drive motor speed.
The operation of preventing the weft (stop) is executed by reversing after the normal rotation or by performing the normal rotation after the reversal as shown by the dotted line. In this way, the weaving bar preventing device 40 obtains the open state of the opening 6 of the warp 7 from the height position of the heddle 9 when the loom 1 is stopped, and when the loom 1 is started,
The feed motor 3 and the winding motor 14 are driven on the basis of the drive amount corresponding to the obtained opening condition, and the woven fabric 1
The position of the cloth fell 11 of 0 is corrected in the front-back direction.

The driving amount output means 24 generates a completion pulse as a completion signal and sends it to the main controller 23 at the time point when the above-described weaving bar preventing operation is completed. After that, the main control device 23 drives the drive motor 17 of the loom 1 according to the input of the completion signal, and restarts the loom 1. The operation of preventing the weaving step is performed by driving an actuator (not shown) for displacing the position of the tension roll 4 instead of driving the feed motor 3 and the winding motor 14.
It can also be realized by moving the cloth fell 11 in a predetermined direction.

The stop state signal is output while paying attention to the stand-by of the weaving machine, while paying attention to the repair work, the repair status signal is output, and the drive amount signal set corresponding to the repair progress is output. It may be output from the means 24. If the time during which the repair status signal is being output is integrated and the drive amount set corresponding to this integrated time is output, the weaving bar can be prevented more effectively.

The heddle frame of interest may be a specific one frame, two frames or a combination of two or more frames, or may be all frames. The drive amount output device 41 may read out the drive amount according to the condition that affects the weft. For example, the output time of the stop state signal is integrated, and the set drive amount is read and output corresponding to the stationary time. As described above, since the stretched state of the warp 7 is different depending on the position of the heddle 9 when the loom 1 is stopped, the weft bar preventing operation detects the stretched state of the warp 7 from the position of the heddle 9 and based on the detected state. Weave 1
A drive amount of 1 will be set.

The opening status signal output means 27 can be configured as shown in FIGS. 5 to 8 described later and can output various signals as opening status signals. Therefore, the drive amount is set in the drive amount setting unit 42 in accordance with the signal, and the drive amount output unit 41 reads the drive amount corresponding to the opening condition signal input at the time of inputting the start signal and displays it in the lower stage. Woven fabric 10 such as a winding control device 25 and a delivery control device 26
The position of the cloth fell 11 can be output to a device capable of correcting, and a series of weft bar preventing operations can be performed.

FIG. 5 shows an example of another opening condition signal output means 27. The opening status signal output means 27 outputs an opening status signal corresponding to the opening step (the number of spindle rotations) in one opening repeat. The step signal generator 43 in the opening state signal output means 27 detects the dog 44 interlocking with the main shaft 18 by the two proximity sensors 45, and based on the signal input with a time lag depending on the rotation direction of the dog 44, the main shaft 18 The rotation direction is determined, and a step step signal corresponding to the forward / reverse rotation direction is output to the counter 48 each time a predetermined timing is passed. The cycle number of opening repeats (upper limit count value) is set in the counter 48 via the setter 49, and the forward / reverse step signal and the reverse step signal are input from the step signal generator 43. The direction is counted and the count value is output as an opening condition signal. In this way, the drive amount output device 41 generates the opening command signal (step signal) given by the drive amount setting device 42 in accordance with the count value during the weaving bar preventing operation.

The opening device 20 is driven in synchronization with the main shaft 18, and the count value is output in synchronization with the opening state. 1
When the 1-open repeat is 4 cycles due to the / 3 twill structure, the upper limit value 4 is set in the counter 48, and after the beating, N is set.
O. If the count value in the cycle in which the heald frame 39 of No. 1 opens the upper mouth is set to 1, the spindle 18 rotates and the subsequent NO. 1, NO. As the heald frame 39 of No. 2 advances to the cycle of opening the upper opening, the count value becomes 1 when the forward rotation step signal is input.
Are added one by one. Eventually, the count value becomes 4, and NO.
When the upper opening of the heddle frame 39 of No. 4 is completed, the count value of the counter 46 returns to 1 by the input of the forward rotation step signal, and NO. 1
This is the cycle in which the heddle frame 39 is opened at the upper mouth. At the time of reverse rotation, the count value is decremented by 1 by inputting a reverse rotation advance signal.

Next, the opening condition signal output means 27 shown in FIG.
Is an example of setting the drive amount corresponding to the opening command pattern. The configuration from the spindle 18 to the counter 46 is the same as that in FIG. 5, and the description thereof will be omitted. The counter 46 is
The rotation phase of the main shaft 18 is detected and the opening step number is output to the opening command signal generator 47. Opening command signal generator 4
The setting device 54 is connected to the setting device 7, and the setting device 54 is provided with a pattern for instructing the movement direction of the healds of each row for each opening step number. Therefore, the opening command signal generator 47 outputs a selection signal for selecting an opening motion of the jacquard device or the dobby device, that is, an excitation output for each solenoid at an appropriate timing, and an opening condition signal as a driving amount output device 41. Also output. In the electronic dobby device, the selection signal of the heald frame 39 is generated before the opening, and therefore cannot be used as it is. Normally, since the selection command of the heald frame 39 is performed one step before the actual opening, it is necessary to store and output the selection signal of the heald frame 39 so as to be output corresponding to the actual opening state. Therefore, the drive amount output device 48 utilizes the signal output from the timing signal generator (not shown),
By detecting the rotation phase of the main shaft 18 and storing the selection command output from the generator 47, the selection signal one step before the actual opening is recognized as corresponding to the actual opening state, and the drive amount A corresponding set drive amount can be read from the setter 42 and output to a device capable of correcting the position of the cloth fell 11 in the lower stage.

The opening condition signal output means 27 may be configured to output a signal related to the opening height as an opening condition signal as shown in FIG. 7, which will be described later, instead of outputting the above-mentioned signal related to the opening pattern. it can. The opening condition signal output means 27 of FIG. 7 is an example in which a more accurate drive amount is set according to the opening height of the heddle frame 39. The plurality of heald frame sensors 55 are displacement sensors of a contact type or a contact type, and output a signal corresponding to the position of the height of the heald 9 (held frame 39). The opening condition signal generator 38 outputs an opening condition signal based on the combination of the height position signals. The heald frame 39 to be detected by the heald frame sensor 55 is
Similar to the above, a specific heddle frame 39 having a large effect on the cloth fell 11, or a plurality of two or more heddle frames 39 or all frames can be used, and the actual opening height is accurately captured and the corresponding drive amount is output. be able to. The opening device 20
The opening lever 50 repeats the reciprocating motion to give the link device 51 a reciprocating motion in the vertical direction, thereby giving the heald frame 39 a motion in the opening direction.

The opening status signal output means 27 of FIG. 8 receives a signal of the spindle rotation angle θ from the opening data setting device 52 and the rotation amount sensor 30 and generates a height signal by the opening height calculator 53. , An example of sending to the opening condition signal generator 38. In this way, the opening height calculator 53 calculates the height from the values of the opening pattern, the spindle rotation angle θ, and the setting values (cross points / opening curve) related to the opening, and generates the height signal. On the other hand, the detection signal from the heald frame sensor 37 provided at the same position as in FIG. 3 is input to the opening status signal output means 27, and the opening status signal output means 27
An opening condition signal can be output based on the detection output from the heald frame sensor 37, that is, the opening pattern and the above-described opening height. In this example, since the opening height is taken into consideration in addition to the opening pattern, even if the stop position of the loom is delayed due to factors such as secular change, and the opening height changes, By reading out the corresponding drive amount based on the above, it is possible to reliably output the accurate drive amount and prevent the weaving bar without causing a discrepancy with the actual opening state.

The signal relating to the height position of the one or more heald frames 39, which is directly detected or indirectly obtained, is output to the opening condition signal output means 27. The opening condition signal output means 27 reads the driving amount corresponding to the combination of the input height signals from the setting device and outputs the driving amount. The drive amount setter 42 may set the drive amount for each combination of height positions. However, in order to simplify the setting, the obtained height position value is set to a plurality of predetermined values. It is also possible to classify which one of the regions it belongs to and read the drive amount corresponding to each belonging region. FIG. 9 shows an example thereof, in which the height position of the heald is 10 from + a5 to −a5.
This is an example of classification into the area. FIG. 9 shows the opening step 1,
With respect to Nos. 2, 3 and 4, changes in height with four opening movements of the heald frames 39 (NO. 1 to NO. 4), that is, opening curves are shown. The opening steps 1, 2, 3, 4 correspond to the patterns 1, 2, 3, 4 of the pattern signal, respectively. Then, a heald frame height signal is output for each of these patterns 1, 2, 3, and 4. For example, in pattern 1,
NO. 1-NO. The height signals of the heald frame 39 of No. 4 are + a3, -a3, -a4, and -a5, respectively. As described above, the heights of the opening curves of the four opening frames 39 are different because the warp threads 7 in the open state are inclined vertically and the positions of the four heddle frames 39 are different in the warp direction. This is because the position of the heddle frame 39 increases as the distance from the cloth fell 11 increases. In the above description, the height of the heddle frame belongs to the area. However, instead of this, a heald frame sensor 37 for detecting the heddle frame is arranged on each side of the heddle frame. You may realize by doing. Further, the area may be freely set corresponding to the fabric.

[0047]

According to the present invention, the following unique effects can be obtained. According to claim 1, when the loom is started, the position of the weaving cloth is corrected in the front-rear direction in accordance with the opening situation of the warp threads in the previously stopped state. It is possible to make a correction, which can reliably prevent the weaving step.

According to the second aspect, the difference in the opening pattern in the stopped state, that is, the position of the cloth fell is corrected with respect to the tension of the warp acting on the cloth cloth and its direction. Accordingly, weaving steps can be reliably prevented. Since the opening device is driven synchronously with the main shaft, if the stop position is constant, the output of the signal related to the opening movement and the actual opening state (opening direction and opening amount) have a one-to-one correspondence. As a result, it becomes possible to set the position correction of the cloth fell corresponding to the opening cycle (opening amount). For example, due to differences in the opening cycle during opening repeats that make up a single tissue,
Even if the tension of the warp thread acting on the position of the cloth fell and its direction are changed, the position of the cloth corresponding to the opening condition (opening height) can be corrected, so that the weft can be reliably prevented.

According to the third aspect, since the opening height in the stopped state is detected, even if the opening height may change due to the secular change of the loom or the setting of the shedding device, the opening height is set correspondingly. Since the position of the cloth fell can be corrected by the amount of movement that is performed, it is possible to reliably prevent a weaving step due to a change in the opening height.

According to the fourth aspect, by combining the two elements, it is possible to more accurately correct the cloth fell position.

Further, according to the fifth aspect, it is possible to surely eliminate the weaving steps which are in different states according to the passage of time.

According to claims 6, 7, 8 and 9, claim 1
Since the inventions of the methods described in (1) to (5) can be realized by a device having a rational configuration, the above-mentioned effects can be realized by this device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an entire loom.

FIG. 2 is a block diagram of a control system of a weft bar preventing device, a winding driving device, and a feeding beam driving device.

FIG. 3 is a block diagram of an opening status signal output unit and a drive amount output unit.

FIG. 4 is a time chart of the operation from the stop of the loom to the restart after the operation of preventing the weft bar.

FIG. 5 is a block diagram of an opening status signal output unit and a drive amount output unit.

FIG. 6 is a block diagram of an opening status signal output unit and a drive amount output unit.

FIG. 7 is a block diagram of an opening status signal output unit and a drive amount output unit.

FIG. 8 is a block diagram of an opening status signal output unit and a drive amount output unit.

FIG. 9 is an explanatory diagram of an opening condition signal corresponding to an opening curve.

[Explanation of symbols]

1 loom 2 Sending beam 3 Feed motor 4 tension rolls 5 Droppers 6 openings 7 warp 8 weft 9 heddle 10 Woven cloth 11 weave 12 reed 13 winding roll 14 Winding motor 15 Cloth roll 16 Tension sensor 17 Drive motor 18 spindle 19 mechanism 20 opening device 21 Winding drive 22 Sending beam driving device 23 Main controller 24 Drive amount output means 25 Winding control device 26 Send-out control device 27 Opening status signal output means 28 Addition point 29 Addition points 30 Rotation amount sensor 31 Density setting device 32 amplifier 33 encoder 34 Target tension setter 35 amplifier 36 encoder 37 heddle frame sensor 38 Opening status signal generator 39 heddle frame 40 Weave prevention device 41 Drive amount output device 42 Drive amount setting device 43 Step signal generator 44 dog 45 Proximity sensor 46 counter 47 Opening command signal generator 48 counter 49 Setting device 50 opening lever 51 Link device 52 Aperture data setter 53 Opening height calculator 54 Setting device 55 heddle frame sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D03D 51/00

Claims (9)

(57) [Claims] 1. A loom having an opening device having healds arranged in a plurality of rows along a warp path, and a member capable of correcting a position before weaving of a woven fabric, wherein the warp is opened when the loom is stopped. When the loom is in a stationary state, the opening mode of the warp is determined, and when the loom is started, the member is driven based on the drive amount set corresponding to the determined mode of warp opening and the position of the cloth fell is corrected. A method for preventing a weaving step of a loom, which comprises: 2. The weaving bar preventing method for a loom according to claim 1, wherein the opening mode of the warp is recognized from an opening pattern. 3. The weaving bar preventing method for a loom according to claim 1, wherein the opening mode of the warp is recognized from the opening height. 4. The weaving bar preventing method for a loom according to claim 1, wherein the opening mode of the warp is recognized from a combination of the opening pattern and the opening height. 5. The setting of the drive amount corresponding to the passage of time, the elapsed time of the stationary state of the opening is integrated, and when the loom is started, the member is set based on the drive amount corresponding to the integrated time. The weaving step preventing method for a loom according to claim 1, 2, 3 or 4, wherein the weaving step is driven. 6. An opening device for driving a heddle arranged in a plurality of rows along a warp path, an opening status signal output means for generating a signal corresponding to the opening status of the warp, and an opening status signal corresponding to the opening status signal. A drive amount output unit configured to set a drive amount and a drive amount output unit configured to output the drive amount set by the drive amount setter in response to the warp yarn opening condition signal; A cloth fell position correcting means for correcting the cloth fell position of the woven fabric according to the output of the output means, and the driving amount output means receives a loom state signal and a start signal, and at the time of the loom state signal input, A weaving bar preventing device for a loom, wherein the drive amount corresponding to the input of the warp shed state signal is read and stored, and the stored value is output as the drive amount when a start signal is input. 7. The shed condition signal output means outputs a signal corresponding to the shed condition based on a shed pattern signal corresponding to the heddle of at least a specified row among a plurality of rows in accordance with the rotation of the main shaft of the loom. 7. The weaving bar preventing device for a loom according to claim 6, wherein: 8. The opening condition signal output means obtains a position of a member which is displaced in accordance with an opening movement, and outputs a signal corresponding to the opening condition based on the obtained position. Weaving step prevention device for the loom described. 9. A drive amount corresponding to a stop time is preset in the drive amount setting device, and the drive amount output device integrates the stop time of the loom according to an input of a loom state signal, 7. The drive amount corresponding to the integration result is output as the drive amount when a start signal is input.
Weaving step prevention device for the loom described.