JP2004277965A - Method and apparatus for preventing weaving bar in weaving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent weaving bar by setting the actual cloth fell position and the value of the warp tension to the correct ones precisely in a weaving machine wherein the cloth fell position is adjusted and the warp tension is newly set before the start of the normal operation of a weaving machine. <P>SOLUTION: In this method for preventing weaving bar in a weaving machine, after completion of the preparation of the start of the weaving machine comprising the cloth fell position-correcting motion for moving the cloth fell position to a prescribed position by rolling the cloth-winding rolls and the warp tension adjusting motion for adjusting the warp tension to a prescribed value by rotating the sending beam, then the weaving machine is allowed to start the normal operation. In this case, after completion of the cloth fell position correction motion, the warp tension adjusting motion is completed. Then, the preparation of the start of the weaving machine is completed after the completion of the warp tension adjustment. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for preventing a weaving step of a loom in which a weaving position correction operation and a warp tension setting operation are performed prior to the start of the loom.
[0002]
[Prior art]
In the loom, before the start of the normal operation (steady operation), the cloth winding roll is rotated by a preset value in a direction opposite to the rotation direction of the normal cloth winding roll (winding roll) to change the cloth fell position to the running direction of the warp. After moving back (retreating) to the rear side (downstream side) of the above, the sending beam is rotated in the direction of rotation of the ordinary clothes roll by a preset value to finely adjust the warp tension on the sending side, and then the normal operation is resumed. A method for preventing a weaving step of a loom is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 2619863
[0004]
[Problem to be solved]
Generally, when a stoppage (stop) cause occurs, the loom waits (stops) with the front and rear warps restrained, and when the cause of the stoppage is repaired, the loom is restarted. The stoppage of the loom is not always the same because the stoppage occurs due to many causes, and the time required for repair varies depending on the arrival delay of the workers and the cause of the stoppage. .
[0005]
For example, since the warp tension is increased by the tension applied to the warp or the weight of the warp, the warp tension decreases as the loom stops longer. For this reason, in the loom in which the warp tension adjusting operation for adjusting the warp tension at the time of starting the loom is performed, the length of time required for the operation changes according to the fluctuation state of the warp tension during the standstill.
[0006]
Further, the start-up preparation operation performed when the operation of the loom starts is performed by moving the entire warp by rotating the delivery beam and the guide roller following the same, and correcting the position of the cloth fell with respect to the beating position. Includes position correction operation. When the cloth fell position is corrected by executing the cloth fell position correcting operation, the warp tension changes.
[0007]
As described above, the period required for the tension adjustment operation is generally affected by the correction amount of the cloth fell position and the fluctuation amount (decrease amount) of the warp tension while the loom is stopped.
[0008]
However, according to the study of the inventors, it has been confirmed that the degree of influence on the warp tension of the cloth fell position and the peripheral part of the cloth fell varies depending on the driving members such as the clothes roll and the delivery beam. That is, if the tension adjusting operation is completed before the completion of the cloth fell position correcting operation, the value of the warp tension set by the tension adjusting operation fluctuates due to the cloth fell position correcting operation.
[0009]
Further, the cloth fell position correction operation is completed in a substantially constant period, but the tension adjustment operation varies according to the degree of fluctuation of the warp tension during the standstill. As the end time comes before or after, the warp tension at the final time (at the start of operation, at the time of the first beating) varies, which greatly deviates from the desired tension value. I do.
[0010]
Therefore, simply performing the cloth fell position correcting operation or the warp tension adjusting operation cannot always be said to prevent the weaving step, and there is a problem in terms of reliability.
[0011]
Specifically, there is little intervening between the arrangement position of the clothes roll and the cloth fell, and the interval between the clothes roll and the cloth fell is short. Moreover, the amount of expansion and contraction of the cloth from the clothing roll to the cloth fell is smaller than that of the warp from the cloth fell to the delivery beam. Therefore, since the rotation of the clothing roll is transmitted to the woven fabric itself, the influence of the cloth fell position correction by rotating the clothing roll is large, and the cloth roll can accurately move the cloth fell position forward and backward.
[0012]
In addition, since the warp is in contact with machine parts such as a heddle frame, a reed, a heald, a dropper, etc., the rotational force of the clothes roll is not easily transmitted to the warp due to friction generated between the machine parts and the warp. . Therefore, the clothing roll is not suitable for adjusting the tension of the warp as compared with the delivery beam as described later.
[0013]
Further, since the rotational force of the delivery beam that directly winds the warp is reliably transmitted to the warp, the relationship between the rotation force of the delivery beam and the tension of the warp is clear, and the delivery beam is a member suitable for tension adjustment.
[0014]
However, there are mechanical parts such as a heddle frame, a reed, a heald, a dropper, etc. between the delivery beam and the cloth fell position, and the presence of these causes friction with the warp. For this reason, even if the warp is moved by rotating the delivery beam, the warp is difficult to be accurately transmitted to the cloth fell due to the friction of the reed or the like, and the cloth fell position after the correction operation by the delivery beam varies. Thus, with respect to the adjustment of the weave position, the delivery beam is less suitable than the clothing roll.
[0015]
In view of the above, in the case of a woven fabric in which it is necessary to accurately adjust both the cloth fell position and the warp tension to prevent the weaving step, the cloth fell position correction operation is sent to the clothing roll and the warp tension adjustment operation is sent. It can be seen that the beams should be shared respectively. Further, as described above, it is presumed that the end of the tension adjusting operation after the cloth fell position correcting operation is most effective for the generation of the weaving step.
[0016]
SUMMARY OF THE INVENTION An object of the present invention is to provide a weaving machine that performs a weaving position correction operation and a warp tension adjusting operation prior to a normal operation of a weaving machine, by accurately adjusting the actual weaving position and the warp tension value. Is to surely prevent
[0017]
[Solutions, actions, and effects]
The weaving step prevention method according to the present invention includes a cloth fell position correcting operation for rotating a clothing roll to move a cloth fell position to a predetermined position and a warp tension adjusting operation for rotating a sending beam to adjust a warp tension to a predetermined value. The present invention relates to a weaving step prevention method for causing a loom to perform a normal operation after a start preparation operation including the following. Such a weaving step prevention method includes, after terminating the cloth fell position correcting operation, terminating the warp tension adjusting operation and terminating the start-up preparation operation.
[0018]
A weaving step prevention device according to the present invention includes a cloth fell position corrector that rotates a clothes roll to move a cloth fell position to a predetermined position, and a warp tension adjustment that rotates a delivery beam to adjust a warp tension to a predetermined value. And a main controller that causes the loom to start normal operation after the start preparation operation of the warp position corrector and the warp tension adjuster is completed. After terminating the cloth fell position correcting operation, the main controller terminates the warp tension adjusting operation and terminates the startup preparation operation. Each end of the weaving position correction operation and the warp tension adjustment operation here specifically corresponds to the completion of each predetermined operation, and is forcibly performed due to an abnormality occurring during each operation. An operation that is temporarily stopped is not included in the above termination.
[0019]
According to the present invention, after the cloth fell position is accurately adjusted by the cloth fell position correction operation by the clothing roll, the warp tension is adjusted to a predetermined value by the warp tension adjustment operation by the delivery beam, and the start preparation operation is terminated. The loom then operates normally. For this reason, any of the cloth fell position and the warp tension that most affect the generation of the weaving step can be accurately adjusted to a desired state.
[0020]
As a result, as in the prior art, for example, due to the warp tension changing each time the loom is stopped, the operation end time of the clothes roll is later than the operation end time of the delivery beam. However, by performing the weaving position adjustment operation, the final warp tension immediately before the start is set to a value greatly deviated from the desired tension value, so that there is no inconvenience that a weaving step occurs.
[0021]
The weaving step prevention method may further include starting the warp tension adjusting operation after starting the weaving position correction operation.
[0022]
The weaving step prevention method may further include starting the warp tension adjusting operation after the cloth fell position correcting operation is completed.
[0023]
The weaving step prevention method further estimates each operation time of the weaving position correction operation and the warp tension adjustment operation, and starts the weaving position correction operation and the warp tension adjustment operation based on each operation time. May be determined, and the cloth fell position correcting operation and the warp tension adjusting operation may be started based on the time difference.
[0024]
The weaving step prevention method may be configured such that the time difference between the timing at which the weaving position correction operation is started and the timing at which the warp tension adjustment operation is started is one value, or the variation in the warp tension from a preset value. It may be a value selected according to the element that occurs.
[0025]
The weaving step prevention method further includes terminating the warp tension adjusting operation after the weaving position correction operation is completed, and controlling the rotation speed of the clothes roll during the weaving position correction operation to the normal operation. The period required for the cloth fell position correction operation may be shortened by making the rotation speed of the clothes roll higher than the rotation speed of the clothes roll at that time.
[0026]
The weaving step prevention method further includes ending the warp tension adjusting operation after the cloth fell position correcting operation is completed. The rotation speed of the delivery beam during the warp tension adjustment operation may be lower than the rotation speed of the delivery beam during the normal operation, and the period required for the warp tension adjustment operation may be extended.
[0027]
The weaving step prevention method, the speed difference between the rotation speed of the clothes roll at the time of the cloth fell position correction operation and the rotation speed of the clothes roll at the time of the normal operation, one value, or a preset value The value may be selected according to the factor in which the warp tension varies.
[0028]
The weaving step prevention method may further include rotating the clothes roll forward or backward as the weaving position correction operation during the period in which the start preparation operation is performed.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, in a loom 10, a warp 12 is connected to a cloth fell 22 from a delivery beam 14 around which the warp 12 passes through a back roller 16, a plurality of heald frames 18 and a reed 20. The woven fabric 24 reaches the clothes roll 28 as a take-up roll from the weaving cloth 22 via the guide roller 26, and is sent out to the cloth winding beam 32 by the clothes winding roll 28 and the pair of press rolls 30, so that the cloth winding beam 32.
[0030]
The delivery beam 14 is rotated by a delivery motor 34 via a gear mechanism 36 constituted by a reduction mechanism such as a gear, and delivers the plurality of warps 12 in the form of a sheet. The amount of the warp 12 wound on the delivery beam 14 gradually decreases with the delivery of the warp 12 from the delivery beam 14. For this reason, the winding diameter of the transmission beam 14 is detected by the winding diameter sensor 38, and the detected winding diameter signal S1 is supplied to the transmission control device 40. The rotation speed of the output shaft of the delivery motor 34 is detected by the tacho generator 42, and the detected delivery rotation speed signal S 2 is supplied to the delivery control device 40.
[0031]
The value of the tension acting on the warp 12 is detected by a warp tension sensor 44 which detects the load acting on the back roller 16, and the detected tension signal S3 is sent out as the actual tension actually acting on the warp 12. It is supplied to the device 40.
[0032]
Each heald frame 18 is reciprocated up and down by a motion converting mechanism 48 that receives the rotational motion of a main shaft 46 rotated by a main shaft motor (not shown), and opens the warp 12 vertically.
[0033]
The reed 20 is swung by a motion converting mechanism 50 that receives the rotational motion of the main shaft 46, and strikes the weft 52 inserted into the opening of the warp 12 against the cloth fell 22.
[0034]
The clothes roll 28 is rotated by a gear mechanism 56 constituted by a reduction mechanism such as a gear receiving the rotation of the winding motor 54, and sends out the woven fabric 24 to the cloth winding beam 32 in cooperation with the press roll 30.
[0035]
The rotation angles of the main shaft 46 and the winding motor 54 are detected by encoders 58 and 60, respectively. The detected main shaft rotation angle signal S4 and roll rotation angle signal S5 are supplied to the winding control device 62. The spindle rotation angle signal S4 is also supplied to the delivery control device 40.
[0036]
The wrapped beam 32 is slid by a winding torque adjusting mechanism 64 that receives the rotational movement of the main shaft 46 so that the circumferential speed of the woven fabric 24 wound around the wrapped beam 32 is slightly higher than the feed speed of the woven fabric 24 (see FIG. (Not shown), and is rotated to keep the value of the winding tension of the woven fabric 24 constant.
[0037]
With reference to FIGS. 2 and 3, the winding control device 62 and the delivery control device 40 acting as one component of the weaving step prevention device of the loom will be described. explain.
[0038]
As illustrated in FIG. 2, the winding control device 62 includes a synchronization control unit 66 that controls the rotation amount of the winding motor 54 when the loom 10 is performing a normal operation (a steady operation), and a preparation for starting the loom 10. And a cloth fell position control unit 68 that controls the amount of rotation of the winding motor 54 in order to correct the position of the cloth fell 22 in the moving direction of the warp 12 at times.
[0039]
A press signal S0 when the operator presses the operation button 72 of the stopped loom 10 is input to the main controller 70. The main controller 70 outputs the activation preparation signal S7 to the drive amount signal generator 76 and the command generator 78 in response to the input of the press signal S0, and the transmission controller 40 and the winding controller 62 perform the activation preparation operation. After the start preparation operation is completed, the operation signal S6 is output to the switch 74 of the transmission control device 40 shown in FIG.
[0040]
Various data used for calculating the basic speed of the take-up motor 54 including the driving density and the correction amount of the cloth fell position during the start-up preparation operation are set in the cloth fell position correction amount setting unit 82 in advance.
[0041]
The drive amount signal generator 76 performs the cloth fell position correction operation only for the period of time t2 shown in FIG. 4D due to the input of the start preparation signal S7. At the time of the cloth fell position correction operation, the drive amount signal generator 76 changes the drive amount (rotation amount) of the winding motor 54 based on the correction amount set in the cloth fell position correction amount setting unit 82 into a pulse-shaped cloth fell. The signal is converted into a position control signal S11 and supplied to one input terminal of an adder 86 of the synchronization controller 66.
[0042]
The synchronization control unit 66 calculates the basic speed of the winding motor 54 based on the driving density set in the cloth fell position correction amount setting unit 82 and the spindle rotation angle signal S4, and drives the winding motor 54. And a basic rotation amount signal generator 84 for performing the rotation.
[0043]
The basic rotation amount signal generator 84 rotates the winding motor 54 to a rotation amount corresponding to the rotation of the loom main shaft by rotating the winding motor 54 at a speed corresponding to the basic rotation speed of the main shaft 46 during the normal operation of the loom 10. be able to.
[0044]
Specifically, the basic rotation amount signal generator 84 receives the spindle rotation angle signal S4 during the normal operation of the loom 10, and performs winding based on the received spindle rotation angle signal S4 and various data such as the driving density. A pulse-like basic rotation amount signal S10 corresponding to the basic speed of the take-off motor 54 is supplied to the other input terminal of the adder 86.
[0045]
The adder 86 inputs both a pulse-shaped cloth fell position control signal S11 input to one input terminal and a pulse-shaped basic rotation amount signal S10 input to the other terminal. The adder 86 outputs the pulse-like signals from the two input terminals to the addition terminal of the forward / reverse counter 88 as a winding target value signal S12.
[0046]
During the start-up preparation period, since the loom 10 is not in normal operation, that is, the main shaft 46 is not rotating, the basic rotation amount signal generator 84 outputs the pulse-like basic rotation amount signal S10 to the adding unit 86. Not. Therefore, the pulse-like winding target value signal S12 output from the adder 86 to the forward / reverse counter 88 is only the signal from the drive amount signal generator 76, that is, the cloth fell position control signal S11.
[0047]
The forward / reverse counter 88 counts the cloth fell position control signal S11 input from the adder 86, and counts the count value as a pulsed roll rotation angle signal supplied from the encoder 60 connected to the output shaft of the winding motor 54. Subtraction is performed in S5. The count value of the forward / reverse counter 88 is supplied to the driver 90 as a winding drive signal S13.
[0048]
The driver 90 is an amplifier circuit that amplifies the input signal and rotates the winding motor 54. If the winding driving signal S13 from the forward / reverse counter 88 is positive, the driver 90 rotates the winding motor 54 forward and turns it negative. If there is, the winding motor 54 is reversed. Thereby, the cloth fell position of the warp yarn 12 is operated to a predetermined position.
[0049]
In the illustrated example, the forward / reverse counter 88 supplies a winding drive signal S13 having a value proportional to the difference between the winding target value signal S12 and the roll rotation angle signal S5 to the winding motor 54 via the driver 90. Therefore, the forward / reverse counter 88 and the driver 90 together with the encoder 60 constitute a direct connection feedback circuit I including only a proportional element for the winding motor 54. Therefore, even if a difference occurs between the winding target value signal S12 and the roll rotation angle signal S5, the winding motor 54 is driven so as to eliminate the difference.
[0050]
For example, the winding motor 54 is a servo motor, and the feedback circuit I is configured by a known circuit for controlling the same.
[0051]
When the start preparation signal S7 is input, the command generator 78, based on the start delay time signal S8 set in the setting device 80, after the time t1 shown in FIG. S9 is output to the switch 74 shown in FIG.
[0052]
As shown in FIG. 3, the delivery control device 40 receives the tension signal S3 from the warp tension sensor 44 to the controller 96 of the operation control unit 94 and the controller 100 of the startup control unit 98. The operation control unit 94 includes a basic speed signal generator 102 to which the driving density signal and the spindle rotation angle signal S4 of the spindle 46 are input.
[0053]
The basic speed signal generator 102 is configured in the same manner as the basic rotation amount signal generator 84 of the winding control device 62 and operates in the same manner, and outputs a speed signal S14 corresponding to the basic speed to one input terminal of the adder 104. Output to The controllers 96 and 100 receive the tension set values T1 and T2 set in the tension setters 106 and 108, respectively.
[0054]
The controller 96 obtains a difference between the actual tension detected by the warp tension sensor 44 and the tension set value set in the tension setter 106, and the rotational speed to be corrected by the PID controller or the like based on the obtained tension difference. , And outputs the converted corrected speed signal S15 to the other input terminal of the adder 104.
[0055]
The adding unit 104 adds the speed signal S14 and the corrected speed signal S15 and outputs a normal operation speed signal S16 to the switch 74.
[0056]
The controller 100 calculates the difference between the actual tension detected by the warp tension sensor 44 and the tension set value set in the tension setter 108, and outputs the obtained tension difference according to the tension difference by a gain controller or the like. To the start-up speed signal S17, and outputs the converted start-up speed signal S17 to the other input terminal of the switch 74.
[0057]
The switch 74 selectively switches the input normal operation speed signal S16 or start speed signal S17 based on the input of the operation signal S6 or the start control start command signal S9, and switches the selected signal S16 or S17. It is output to the winding diameter corrector 110 as a speed signal S18.
[0058]
When the time t1 elapses after the operation button 72 is pressed, the command generator 78 outputs a start-time control start command signal S9 to the switch 74 (see FIG. 4C). When the start-up control start command signal S9 is input, the switch 74 sets the start-up control section 98 to the selected state and outputs the start-up speed signal S17 to the winding diameter corrector 110 as a speed signal S18.
[0059]
In both the start-up and the normal operation, the value of the speed signal S18 selected by the switch 74 corresponds to the speed of the warp 12 to be sent out from the sending beam 14. However, since the warp winding diameter of the delivery beam 14 gradually decreases with the delivery of the warp 12, in order to keep the amount of warp delivered from the delivery beam 14 constant, the rotation speed of the delivery beam 14 depends on the winding diameter. Need to be corrected. Accordingly, the speed signal S18 from the switch 74 is corrected based on the winding diameter signal S1 detected by the winding diameter sensor 38.
[0060]
The winding diameter corrector 110 corrects the speed signal S18 from the switch 74 based on the winding diameter signal S1 from the winding diameter sensor 38, and outputs a correction signal S19 to one input terminal of the subtraction unit 112.
[0061]
As a result, the delivery control device 40 causes the controller 100 to be in the selected state only during the time t3 (see FIG. 4E), and causes the delivery motor 34 to perform the warp tension adjusting operation. The time t3 is set to a different time depending on the tension deviation, the internal gain of the controller, and the like. Therefore, the time t3 is previously obtained by actually measuring several times in a state where the warp tension values are different.
[0062]
The warp tension adjusting operation is performed such that the tension of the warp 12 is adjusted to the tension set value T2 set in the tension setting device 108 even when the cloth fell position correcting operation is performed.
[0063]
The number of rotations of the output shaft of the sending motor 34 is detected by the tacho generator 42 connected to the output shaft, and output to the other input terminal of the subtraction unit 112 as the sending rotation speed signal S2.
[0064]
The subtracting unit 112 subtracts the sending rotation speed signal S2 from the selected speed signal S18, outputs the subtraction result to the driver 114, and drives the sending motor 34. Therefore, the delivery control device 40 acts as one component of the feedback circuit II that controls the delivery motor 34 so that the speed of the warp yarn 12 delivered from the delivery beam 14 becomes a speed according to the correction signal S19.
[0065]
As shown in FIG. 4, the cloth fell position correcting operation and the warp tension adjusting operation are performed so that the warp tension adjusting operation is completed after the cloth fell position correcting operation is completed (specifically, the relationship of t2 <t1 + t3 is satisfied). ), The times t1, t2, and t3 are preset in the main controller 70, the cloth fell position correction amount setting device 82, and the setting device 80. Therefore, there is an overlapping time t4 (from when the time t1 has elapsed after the operation button 72 was pressed to when time t2 has elapsed after the operation button 72 was pressed). Therefore, the loom 10 corrects the weaving position and adjusts the warp tension.
[0066]
Preferably, the relationship between the time t3 and the time t1 is previously stored in a database corresponding to the tension deviation, and the time t1 is read out from the setter 80 in accordance with the deviation detected immediately before the preparation for starting the loom, and each operation is started. Let it.
[0067]
However, even when the cloth fell position correcting operation and the warp tension adjusting operation are performed at the same time, the position of the cloth fell 22 is hardly affected by the warp tension adjusting operation and is adjusted mainly by the cloth fell position correcting operation.
[0068]
More specifically, as described above, equipment such as a heald frame 18, a reed 20, a heald, a dropper, and the like exist between the delivery beam 14 and the cloth fell 22. Therefore, even if the warp 12 is moved by rotating the delivery beam 14, most of such movement is absorbed by friction of the heald frame 18, the reed 20, and the like, and the position of the weave 22 is moved in the warp moving direction. Hardly moves forward and backward.
[0069]
In addition, since there is little intervening between the clothing roll 28 and the cloth fell 22 and the distance between the clothing roll 28 and the cloth fell 22 is small, the movement of the woven fabric 24 in the warp moving direction due to the rotation of the clothing roll 28 is small. It is reliably transmitted to the woven fabric 24 itself. For this reason, the position of the cloth fell 22 is reliably moved to the upstream side or the downstream side in the warp moving direction by rotating the clothes roll 28 by the cloth fell position correcting operation. Therefore, generation of a weaving step is reliably prevented.
[0070]
When the time t2 elapses after the operation button 72 is pressed, the cloth fell position correction operation is completed, but the warp tension adjustment operation is continuously performed. However, the position of the cloth fell 22 hardly shifts even when the warp tension adjusting operation is performed.
[0071]
More specifically, as described above, between the delivery beam 14 and the position of the cloth fell 22, equipment such as a heald frame 18, a reed 20, a heald, and a dropper are present. Friction occurs. For this reason, even if the warp 12 is moved by rotating the sending beam 14, it is difficult to accurately transmit the warp 12 to the cloth fell 22 due to friction of the heald frame 18 and the reed 20. Therefore, even if the warp tension adjusting operation is performed, the position of the cloth fell 22 hardly moves, and the generation of the weaving step is reliably prevented.
[0072]
Further, since the rotational force of the delivery beam 14 is accurately transmitted to the warp 12 wound on the delivery beam 14, the relationship between the rotation force of the delivery beam 14 and the tension of the warp 12 is clear, and the adjustment of the warp tension It is suitable for.
[0073]
When the time t3 has elapsed, the warp tension adjusting operation is completed. Thereby, the cloth fell position correcting operation and the warp tension adjusting operation are once completed.
[0074]
Next, main controller 70 outputs operation signal S6 to switch 74 to cause loom 10 to start normal operation.
[0075]
As shown in FIG. 3, when the operation signal S6 is input, the switching unit 74 sets the operation control unit 94 to the selected state, and outputs the normal operation speed signal S16 as the speed signal S18 to the winding diameter corrector 110. I do.
[0076]
The controller 96 converts the tension value of the warp 12 into the correction speed signal S15 corresponding to the rotation speed to be corrected so that the tension value of the warp 12 becomes the tension set value T1 set in the tension setter 106, as described above, The converted correction speed signal S15 is output to one input terminal of the adder 104.
[0077]
During normal operation, the basic rotation amount signal generator 84 and the basic speed signal generator 102 shown in FIGS. 2 and 3 are involved in weaving based on the driving density, the rotation angle signal S4 of the rotating main shaft, and the like, respectively. A basic rotation amount signal S10 and a speed signal S14 corresponding to the moving speed of the woven fabric 24 are output to the other input terminals of the adders 86 and 104.
[0078]
In addition, the drive amount signal generator 76 does not output the cloth fell position control signal S11 to the adder 86 because the cloth fell position correction operation has been completed.
[0079]
Therefore, the winding target value signal S12 and the normal operation speed signal S16 input to the forward / reverse counter 88 and the switch 74 are signals adjusted so that the cloth fell 22 is always at the beating position.
[0080]
The above-described weaving position correction operation has been described for the case where the warp tension adjusting operation is started after the start of the weaving position correction operation, and then the weaving position correction operation is ended. The warp tension adjusting operation may be started. In this case, a signal indicating the end of the weaving position correction operation (operation completion) may be output from the winding control device 62 to the delivery control device 40 to start the warp tension adjusting operation.
[0081]
In the above embodiment, the warp tension adjusting operation is started after the lapse of time t1 from the start of the cloth fell position correcting operation. However, the time t3 of the warp tension adjusting operation is changed to the time t2 of the cloth fell position correcting operation. When the value is sufficiently large, the time t1 can be shortened, and further, the time t1 can be set to 0 (that is, the cloth fell position correcting operation and the warp tension adjusting operation are started simultaneously). .
[0082]
Further, the present invention can be modified as follows. For example, it is conceivable that the length of the warp tension adjustment period changes depending on the amount of decrease in the warp tension generated during the period during which the loom is stopped. More specifically, a problem hardly occurs when the stand is stopped for a long period of time. However, when the cause of the stop is quickly repaired and the amount of decrease in the warp tension is small, the period required for the warp tension adjustment operation is shortened. In other words, when the restoration is performed promptly, the end of the cloth fell position correcting operation is later than the end of the warp tension adjusting operation, and a problem as in the related art may occur. Therefore, when the deviation amount of the warp tension immediately before the start preparation is small, the time t1 may be lengthened so that the end of the warp tension adjusting operation is later than the end of the cloth fell position correcting operation. Preferably, a warp tension deviation signal is input to the setting device 80 shown in FIG. 2, and a plurality of times t1 are set in accordance with the tension deviation. When the start preparation signal S7 is generated, based on the detected tension deviation, A time t1, which is a corresponding time difference, is configured to be selectable.
[0083]
Referring to FIG. 5, the delivery control device 40 and the take-up control device 62 change the value of the cloth fell position control signal S11 of the cloth fell position correcting operation based on the value of the warp tension to correct the cloth fell position. Adjust the operation time.
[0084]
More specifically, the start-up control unit 98 of the delivery control device 40 calculates the difference ΔT between the tension value T2 set in the tension setting unit 108 and the tension signal S3 detected by the warp tension sensor 44, Output to the controller 100 and output to the speed corrector 116.
[0085]
In order to speed up the cloth fell position correction operation in accordance with the decrease in the difference ΔT in the tension value, the speed corrector 116 sets a value K larger than 1 corresponding to the difference ΔT in the tension value as the speed command value signal S20 as the drive amount signal S20. Output to the generator 76. The relationship between ΔT and K may have a relationship based on a table previously measured by an experiment, or may have a relationship represented by a specific calculation formula. In this case, the time t3 of the warp tension adjusting operation is set to be constant.
[0086]
When the speed command value signal S20 is input, the drive amount signal generator 76 multiplies the value set in the weave position correction amount setter 82 by K and outputs it to the adder 86 as a weave position control signal S11. As a result, the cloth fell position control signal S11 has a larger value than the cloth fell position control signal S11 output from the drive amount signal generator 76 shown in FIG. In other words, the rotation speed of the clothing roll 28 during the cloth fell position correction operation is made longer than the rotation speed of the clothing roll 28 during the normal cloth fell position correction operation to shorten the time required for the cloth fell position correction operation. I have. In this way, the warp tension adjusting operation is completed after the cloth fell position correcting operation is completed.
[0087]
6, the horizontal axis indicates the time axis, and the vertical axis indicates the winding speed corresponding to the cloth fell position control signal S11 output from the drive amount signal generator 76. The area of the hatched portion indicates the amount of movement of the position of the cloth fell 22 (the cloth fell position correction amount).
[0088]
From FIGS. 6A and 6B, it can be seen that when the winding speed is increased, the time t2 of the cloth fell position correction operation is shortened. Therefore, the end time of the tension adjustment operation can be apparently delayed by shortening the period of the cloth fell position correction operation.
[0089]
Referring to FIG. 7, the delivery control device 40 and the take-up control device 62 change the value of the start-up speed signal S17 of the warp tension adjusting operation based on the setting value of the cloth fell position correction amount setting device 82. An example in which the time required for the warp tension adjusting operation is thereby adjusted will be described.
[0090]
When the cloth fell position correction amount is set to a large value, the output value of the speed signal S17 at the start of the tension adjustment operation is reduced to make the tension adjustment operation time seemingly longer, thereby completing the timing of the tension adjustment operation. Delay.
[0091]
Specifically, the time t2 of the cloth fell position correction operation is independent of the set correction amount of the cloth fell position (that is, the drive is performed at a speed calculated so that the time t2 of the cloth fell position correction operation becomes constant. In this case, the value of the gain signal S21 of the gain corrector 118 of the controller that operates at the time of startup is reduced.
[0092]
The weaving step prevention device shown in FIG. 7 once obtains the time t3 of the warp tension adjusting operation and determines the gain signal S21 in the tension adjusting operation or the speed command of the cloth fell correcting operation from the relationship with the time t2 of the cloth fell position correcting operation. By changing the value signal S20, the end timing of the tension adjustment operation may be delayed from the end timing of the cloth fell position correction operation.
[0093]
More specifically, the winding control device 62 outputs the value set in the cloth fell position correction amount setting device 82 to the gain corrector 118. The gain corrector 118 outputs a gain signal S21 corresponding to a positive real number K2 of 1 or less to the controller 100 according to the value set in the cloth fell position correction amount setting device 82.
[0094]
When the gain signal S21 is input, the controller 100 further multiplies the value of the difference between the tension setter 108 and the tension signal S3 by a coefficient K2 having a value of less than 1 and outputs the result as a startup speed signal S17. Thus, the startup speed signal S17 has a smaller value than the startup speed signal S17 output from the controller 100 shown in FIG. In other words, the rotation speed of the delivery beam 14 during the warp tension adjustment operation is made slower than the rotation speed of the delivery beam 14 during the normal tension adjustment operation, thereby extending the period required for the warp tension adjustment operation. Thus, the end time of the apparent cloth weaving position correction operation is increased by increasing the time required for the warp tension adjustment operation.
[0095]
6 and 7, when a large value is set to the cloth fell position correction amount, the speed correction amount and the gain are changed. However, the present invention can be modified as follows.
[0096]
For example, it is conceivable that the length of the warp tension adjustment period changes depending on the amount of decrease in the warp tension generated during the period during which the loom is stopped. More specifically, the problem is less likely to occur when the stand is stopped for a long period of time, but when the cause of the stand is quickly repaired and the amount of decrease in the warp tension is small, the period required for the warp tension adjusting operation is shortened. In other words, when the restoration is performed promptly, the end of the cloth fell position correcting operation is later than the end of the warp tension adjusting operation, and a problem as in the related art may occur.
[0097]
For this reason, when the deviation amount of the warp tension immediately before the start preparation is small, the speed correction is performed so as to reduce the speed at the time of the cloth fell position correction operation, or the gain corrector is set so that the rotation speed of the sending beam is reduced. Or the gain of the warp tension adjusting operation may be made later than the end of the cloth fell position correcting operation. Preferably, the warp tension deviation signal is input to the speed compensator and the gain compensator shown in FIGS. 6 and 7, and a plurality of correction coefficients and gains are set in accordance with the tension deviation to generate the start preparation signal S7. At times, a corresponding correction coefficient or gain can be selected based on the detected tension deviation.
[0098]
Further, each operation time of the weaving position correction operation and the warp tension adjusting operation is estimated, the time difference between the start of the weaving position correction operation and the warp tension adjusting operation is determined based on each operation time, and the weaving is performed based on the time difference. The front position correcting operation and the warp tension adjusting operation may be started.
[0099]
The time difference between the timing of starting the weaving position correction operation and the timing of starting the warp tension adjusting operation is one value, or a value selected according to an element in which the warp tension varies from a preset value. Is also good. For example, factors that cause the warp tension to vary include the setting time of the warp tension, the warp shedding amount, and the like, in addition to the loom stoppage time as described above. It is conceivable that the main shaft crank angle when the loom is stopped is related to the warp knitting amount.
[0100]
The rotation speed of the clothing roll 28 during the cloth fell position correction operation may be higher than the rotation speed of the clothing roll 28 during normal operation, and the period required for the cloth fell position correction operation may be shortened.
[0101]
The rotation speed of the delivery beam 14 during the warp tension adjustment operation may be slower than the rotation speed of the delivery beam 14 during the normal operation, and the period required for the warp tension adjustment operation may be extended.
[0102]
The speed difference between the rotation speed of the clothing roll 28 during the cloth fell position correction operation and the rotation speed of the clothing roll 28 during the normal operation is set to one value or an element that causes a variation in warp tension from a preset value. It may be a value selected accordingly.
[0103]
The clothing roll 28 may be rotated forward or backward during the start preparation operation. More specifically, the cloth fell position correcting operation is not limited to being performed only once at the time of preparing to start the loom, and may be performed twice. Regarding what is performed twice, it is possible to rotate both times in the same direction (for example, both times forward or reverse rotation) or to rotate in different directions (forward to reverse or reverse to normal rotation). .
[0104]
On the other hand, the warp tension adjusting operation may be performed for each cloth fell position correcting operation, or may be performed at the time of the final cloth fell position correcting operation. The cloth fell position correction operation can be performed not only twice but three or more times.
[0105]
Although the warp tension is detected by detecting the load acting on the back roller 16 with the warp tension sensor 44 and detecting the tension of the entire warp, the tension of a part of the warp 12 may be detected.
[0106]
The warp tension sensor 44 that detects the load acting on the back roller 16 may be configured to detect distortion or displacement of the back roller 16.
[0107]
The warp tension sensor 44 is provided on the back roller 16 in order to detect the load acting on the back roller 16, but may be provided on any member that contacts the warp 12 or the woven fabric 24.
[0108]
In the loom 10 shown in FIGS. 1 to 4, the clothes roll 28 and the delivery beam 14 are controlled by separate circuits, but the clothes roll 28 and the delivery beam 14 may be controlled by a single control circuit. .
[0109]
The generators 76, 78, 84, the controllers 96, 100, the winding diameter corrector 110, and the feedback circuits I and II may be realized by software processing using a microcomputer in addition to hardware processing.
[0110]
The present invention may be applied to a loom 10 of a change weave. For example, in a loom in which a plurality of weft densities are selectively switched according to the number of picks for weft insertion, a weaving position correction operation amount at the time of startup is set not according to a fixed value but according to the weft density at the time of startup. Alternatively, in a loom that switches the warp target tension in accordance with the switching of the weft density, the target warp tension at startup is set according to the target warp tension corresponding to the weft density at startup.
[0111]
The internal configuration of the controller 96 is PID control, but may be a known controller or simplified control. The simplified control may include a comparator that compares the warp tension with a set value, and a speed command output circuit that switches the speed command output state based on the comparison result, or a low speed command in the direction of eliminating the tension deviation. The value may be output, and the output may be stopped when the set tension is reached.
[0112]
The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist thereof.
[Brief description of the drawings]
FIG. 1 is a schematic view of a loom provided with a weaving step prevention device according to the present invention.
FIG. 2 is a block diagram showing one embodiment of a winding control device constituting a part of the weaving step prevention device shown in FIG.
FIG. 3 is a block diagram showing one embodiment of a delivery control device constituting a part of the weaving step prevention device shown in FIG. 1;
FIG. 4 is a time chart for explaining the operation of the weaving step prevention device shown in FIG. 1;
FIG. 5 is a block diagram showing a modified example of the weaving step prevention device according to the present invention.
FIG. 6 is a graph showing an output with respect to time for explaining an operation of the speed corrector of the weaving step preventing device shown in FIG. 5;
FIG. 7 is a block diagram showing another modified example of the weaving step prevention device according to the present invention.
[Explanation of symbols]
I, II feedback circuit
S0 press signal
S1 winding diameter signal
S2 sending rotation speed signal
S3 tension signal
S4 Spindle rotation angle signal
S5 Roll rotation angle signal
S6 Operation signal
S7 Start preparation signal
S8 Start delay time signal
S9 Start-up control start command signal
S10 Basic rotation amount signal
S11 cloth fell position control signal
S12 Winding target value signal
S13 Winding drive signal
S14 Speed signal
S15 Correction speed signal
S16 Normal operation speed signal
S17 Startup speed signal
S18 Speed signal
S19 Correction signal
S20 Speed command value signal
S21 Gain signal
t1 Time (period) from the start of the cloth fell position correction operation to the start of the warp tension adjustment operation
t2 Time (period) of the cloth fell position correct operation
t3 Time (period) of warp tension adjustment operation
t4 Time (period) when the cloth fell position correct operation and the warp tension adjusting operation overlap.
10 loom
12 Warp
14 Transmission beam
16 Back roller
18 Heald frame
20 reeds
22 Ori
24 Woven cloth
26 Guide roller
28 Clothing roll
30 Press Roll
32 cloth roll beam
34 Delivery motor
36,56 Gear mechanism
38 winding diameter sensor
40 Transmission control device
42 tacho generator
44 Warp tension sensor
46 spindle
48,50 motion conversion mechanism
52 weft
54 take-up motor
58, 60 encoder
62 Take-up control device
64 Winding torque adjustment mechanism
66 Synchronization control unit
68 Weave position control unit
70 Main controller
72 Run button
74 switch
76 Drive amount signal generator
78 Command generator
80 Setting device
82 Weave position correction amount setting device
84 Basic rotation amount signal generator
86 Adder
88 Forward / reverse counter
90,114 driver
94 Operation control unit
96 controller
98 Start-up control unit
100 controller
102 Basic speed signal generator
104 Adder
106,108 Tension setting device
110 diameter compensator
112 Subtraction unit
116 speed compensator

Claims (10)

After the start-up preparation operation including the cloth fell position correcting operation of rotating the clothing roll to move the cloth fell position to the predetermined position and the warp tension adjusting operation of rotating the sending beam to adjust the warp tension to a predetermined value is completed. , Making the loom run normally, a weaving step prevention method,
A method for preventing a weaving step of a loom, comprising ending the warp tension adjusting operation and ending the start-up preparation operation after ending the weaving position correction operation. The method according to claim 1, further comprising starting the warp tension adjusting operation after starting the cloth fell position correcting operation. 3. The method of claim 2, further comprising: starting the warp tension adjustment operation after the cloth fell position correction operation has been completed. Further, estimating each operation time of the weave position correction operation and the warp tension adjusting operation, determining a time difference between the start timing of the weave position correction operation and the warp tension adjustment operation based on each operation time, 3. The method of claim 2, comprising initiating the weave position correction operation and the warp tension adjustment operation based on a time difference. A time difference between the time when the cloth fell position correcting operation is started and the time when the warp tension adjusting operation is started is selected according to an element in which the warp tension varies from one value or a preset value. The method of claim 4, wherein Further, the warp tension adjusting operation includes ending after the cloth fell position correcting operation is ended,
The rotation speed of the clothing roll during the cloth fell position correction operation is made faster than the rotation speed of the clothing roll during a normal start-up preparation operation, thereby shortening a period required for the cloth fell position correction operation. Or the method of 2. Further, the end timing of the warp tension adjusting operation may be ended after the cloth fell position correcting operation is ended,
The rotation speed of the delivery beam at the time of the warp tension adjustment operation is slower than the rotation speed of the delivery beam at the time of the normal start-up preparation operation, and the period required for the warp tension adjustment operation is lengthened. 3. The method according to 2. The speed difference between the rotation speed of the clothing roll during the cloth fell position correction operation and the rotation speed of the clothing roll during the normal operation is a single value, or the variation in the warp tension from a preset value. The method according to claim 6 or 7, wherein the value is selected according to a factor to be generated. The method according to any one of claims 1 to 8, further comprising, during the period in which the start-up preparation operation is performed, rotating the clothes roll forward or backward as the cloth fell position correction operation. . A cloth fell position corrector that rotates the clothes roll to move the cloth fell position to a predetermined position,
A warp tension adjuster for adjusting the warp tension to a predetermined value by rotating the delivery beam;
A main controller for starting the normal operation of the loom after the start preparation operation of the weaving position corrector and the warp tension adjuster is completed.
The weaving step prevention device for a loom, wherein the main control device terminates the warp tension adjusting operation and terminates the start-up preparation operation after terminating the cloth fell position correcting operation.

Images