JP4616368B2 - Method and apparatus for preventing weaving of loom - Google Patents

Description

  The present invention relates to a weaving step prevention method and apparatus for a loom in which a pre-weaving position correction operation and a warp tension setting operation are performed prior to the start of the loom.

  In the loom, before the start of normal operation (steady operation), the clothing roll is rotated in the direction opposite to the rotation direction of the normal clothing roll (winding roll) by the preset value, and the position before the weaving is moved in the warp running direction. After moving (retracting) to the rear side (downstream side), rotating the delivery beam by a preset value in the normal direction of rotation of the normal winding roll to finely adjust the warp tension on the delivery side, then resume normal operation A method for preventing a weaving step of a loom is known (for example, see Patent Document 1).

Japanese Patent No. 2619863

  In general, when a cause of stoppage (stop) occurs, the loom stands by (stops), and when the cause of stoppage is repaired, the loom is restarted. Due to many causes, the stoppage occurs, and the time required for the repair depends on the arrival delay of the worker and the cause of the stoppage. .

  For example, the warp tension is increased by the tension applied to the warp and the weight of the warp, and thus the warp tension decreases as the loom stops. For this reason, in a loom in which a warp tension adjusting operation is performed to adjust the warp tension when the loom is started up, the length of time required for the operation varies according to the degree of fluctuation of the warp tension during the stoppage.

  In addition, the start-up preparation operation performed when starting the operation of the loom moves the entire warp by rotating the delivery beam and the guide roller that follows this, and corrects the position before weaving with respect to the beating position. Includes position correction. When the pre-weaving position is corrected by executing this pre-weaving position correcting operation, the warp tension changes.

  As described above, the period required for the tension adjusting operation is generally affected by the correction amount of the pre-weaving position and the fluctuation amount (decrease amount) of the warp tension while the loom is stopped.

  However, according to research by the inventors, it has been confirmed that the degree of influence on the warp tension at the pre-weaving position and the front periphery of the weave differs depending on the driving member such as the clothing roll and the delivery beam. That is, when the tension adjusting operation is completed before the pre-weaving position correcting operation is completed, the value of the warp tension set by the tension adjusting operation is changed by the pre-weaving position correcting operation.

  In addition, although the pre-weaving position correction operation is completed in a substantially fixed period, the tension adjustment operation varies depending on the variation of the warp tension during the stoppage. The end time will be around, and the final warp tension (at the start of operation, at the first beating) will vary and will be far from the desired tension value, resulting in weaving steps To do.

  Therefore, simply executing the pre-weaving position correcting operation and the warp tension adjusting operation cannot always prevent the weaving step, and there is a problem in terms of certainty.

  Specifically, there is little intervening between the arrangement position of the clothing roll and the cloth, and the space between the clothing roll and the cloth is short. Moreover, the amount of stretch of the cloth from the clothing roll to the pre-weaving is smaller than that of the warp from the pre-woven to the delivery beam. Accordingly, since the rotation of the clothing roll is transmitted to the woven fabric itself, the degree of influence of the correction of the position before the weaving by rotating the clothing roll is large, and the forward / backward movement of the position before the weaving can be accurately performed by the clothing roll.

  In addition, the rotational force of the clothing roll is difficult to be accurately transmitted to the warp due to the friction generated between the machine part and the warp because the warp is in contact with the machine part such as the heel frame, the heel, the heald, and the dropper. . Therefore, the clothing roll is not suitable for adjusting the warp tension as compared with the delivery beam, as will be described later.

  Further, since the rotational force of the delivery beam directly wound with the warp is reliably transmitted to the warp, the relationship between the rotational force of the delivery beam and the warp tension is clear, and the delivery beam is a member suitable for tension adjustment.

  However, there are mechanical parts such as a reed frame, a reed, and a dropper between the delivery beam and the pre-weaving 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, it is difficult to accurately transmit it before weaving due to friction such as wrinkles, and variations occur in the position before weaving after the correction operation by the delivery beam. Therefore, the delivery beam is not suitable for adjusting the pre-weaving position compared to the clothing roll.

  Because of the above, for fabrics that require precise adjustment of both the pre-weaving position and warp tension to prevent weaving steps, the pre-weaving position correction operation is sent to the clothing roll and the warp tension adjustment operation is sent out. It can be seen that each beam should be shared. Furthermore, as described above, it is assumed that the end of the tension adjustment operation is after the pre-weaving position correcting operation, which is most effective for the generation of the weaving steps.

  The object of the present invention is to accurately adjust the actual weaving position and warp tension values in the weaving machine that performs the pre-weaving position correction operation and the warp tension adjustment operation prior to the normal operation of the loom. It is to surely prevent.

The weaving step preventing method according to the present invention includes a pre-weaving position correcting operation for rotating the winding roll to move the pre-weaving position to a predetermined position, and a warp tension adjusting operation for adjusting the warp tension to a predetermined value by rotating the delivery beam. It is related with the weaving step prevention method which makes a loom perform normal driving | operation after completion | finish of starting preparation operation | movement including these. Such a weaving step preventing method includes a time difference between an operation time of the pre-weaving position correction operation, an operation time of the warp tension adjustment operation, and a start time of the pre-weave position correction operation and a start time of the warp tension adjustment operation. With regard to the following control for either of the time differences when
a) controlling an operation time of the pre-weaving position correcting operation based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation;
b) The operation time of the warp tension adjusting operation is controlled based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation or a set correction amount of the pre-weaving position correcting operation. And c) controlling the time difference based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation, thereby performing the weaving The warp tension adjusting operation is ended after the front position correcting operation is completed.

The weaving step preventing device according to the present invention includes a pre-weaving position corrector that rotates a clothing roll and moves the pre-weaving position to a predetermined position;
A warp tension adjuster that rotates the delivery beam to adjust the warp tension to a predetermined value;
And a main controller that causes the loom to start normal operation after the pre-weaving position correcting operation by the pre-weaving position corrector and the warp tension adjusting operation by the warp tension adjuster in the start preparation period.
The main controller includes an operation time of the pre-weaving position correcting operation by the pre-weaving position corrector, an operating time of the warp tension adjusting operation by the warp tension adjuster, and the pre-weaving position by the pre-weaving position corrector. Regarding the following control for any of the time differences when there is a time difference between the start time of the correction operation and the start time of the warp tension adjustment operation by the warp tension adjuster,
a) controlling an operation time of the pre-weaving position correcting operation based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation;
b) The operation time of the warp tension adjusting operation is controlled based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation or a set correction amount of the pre-weaving position correcting operation. C) controlling the time difference based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation;
The warp tension adjusting operation is terminated after the pre-weaving position correcting operation is completed.

  Each end of the pre-weaving position correction operation and warp tension adjustment operation here specifically corresponds to the completion of each predetermined operation, and it is forcibly operated due to an abnormality that occurred during each operation. What is canceled is not included in the above termination.

  According to the present invention, after the pre-weaving position is accurately adjusted by the pre-weaving position correction operation by the clothing roll, the warp tension is adjusted to a predetermined value by the warp tension adjusting operation by the delivery beam, and the start preparation operation is terminated. Thereafter, the loom is normally operated. For this reason, both the pre-weaving position and the warp tension that most affect the occurrence of the weaving step can be accurately adjusted to a desired state.

  As a result of the above, as a result of, for example, the warp tension during the stoppage of the loom changes every time, as a result of the operation end timing of the winding roll being delayed from the operation end timing of the delivery beam, after the warp tension adjustment operation ends. However, since the pre-weaving position adjusting operation is performed, the final warp tension just before the start is set to a value greatly deviated from the desired tension value, and there is no inconvenience that the weaving stage is generated.

  The weaving step prevention method sets the start time of the warp tension adjusting operation after the pre-weaving position correcting operation is started, and controls the warp tension adjusting operation by controlling the a) or the b). It may be ended after the front position correction operation is ended.

  In the weaving step prevention method, the start time of the warp tension adjusting operation may be set before the pre-weaving position correcting operation is completed.

  In the weaving step prevention method, the control of b) may be performed by changing a gain used for obtaining the rotation speed of the transmission beam based on the deviation based on the set correction amount.

  The weaving step prevention method further estimates each operation time of the pre-weaving position correction operation and the warp tension adjustment operation, and starts the pre-weaving position correction operation and the warp tension adjustment operation based on each operation time. And determining the pre-weaving position correcting operation and the warp tension adjusting operation based on the time difference.

  In the weaving step prevention method, the time difference between the timing of starting the pre-weaving position correcting operation and the timing of starting the warp tension adjusting operation is selected according to an element that causes variation in the warp tension from a preset value. It may be a value.

  Referring to FIG. 1, in a loom 10, a warp yarn 12 is connected from a delivery beam 14 around which the warp yarn 12 is wound to a foreground 22 through a back roller 16, a plurality of reed frames 18 and reeds 20. The woven fabric 24 woven reaches the clothing roll 28 as a winding roll from the pre-weaving 22 via the guide roller 26, and is sent out to the fabric winding beam 32 by the clothing winding roll 28 and the pair of press rolls 30 to be the fabric winding beam. 32 is wound up.

  The delivery beam 14 is rotated by a delivery motor 34 via a gear mechanism 36 constituted by a speed reduction mechanism such as a gear, and delivers a plurality of warps 12 in the form of a sheet. The amount of the warp 12 wound around the delivery beam 14 gradually decreases with the delivery of the warp 12 from the delivery beam 14. Therefore, the winding diameter of the delivery beam 14 is detected by the winding diameter sensor 38, and the detected winding diameter signal S1 is supplied to the delivery control device 40. The rotational speed of the output shaft of the delivery motor 34 is detected by the tacho generator 42, and the detected delivery rotational speed signal S2 is supplied to the delivery control device 40.

  The value of the tension acting on the warp 12 is detected by a warp tension sensor 44 that detects the load acting on the back roller 16, and the detected tension signal S3 is controlled as an actual tension actually acting on the warp 12. Supplied to the device 40.

  Each reed frame 18 is reciprocated up and down by a motion converting mechanism 48 that receives the rotational motion of the main shaft 46 rotated by a main shaft motor (not shown), thereby opening the warp 12 up and down.

  The scissors 20 are swung by a motion conversion mechanism 50 that receives the rotational motion of the main shaft 46, and strikes the weft 52 that is inserted into the opening of the warp 12 against the weft 22.

  The clothing roll 28 is rotated by a gear mechanism 56 formed of a speed reduction mechanism such as a gear that receives the rotational motion of the winding motor 54, and sends the woven fabric 24 to the cloth winding beam 32 in cooperation with the press roll 30.

  The rotation angles of the main shaft 46 and the winding motor 54 are detected by encoders 58 and 60, respectively. The detected spindle 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.

  The cloth winding beam 32 is a sliding bearing (see FIG. 4) by a winding torque adjusting mechanism 64 that receives the rotational movement of the main shaft 46 so that the peripheral speed of the woven cloth 24 wound around the cloth winding beam 32 is slightly higher than the feed speed of the woven cloth 24. (Not shown) and rotated to keep the winding tension value of the woven fabric 24 constant.

  The winding control device 62 and the delivery control device 40 that function as components of the weaving step prevention device of the loom will be described with reference to FIGS. 2 and 3 and the operation of the weaving step prevention device will be described with reference to FIG. explain.

  As shown in FIG. 2, the winding control device 62 includes a synchronous control unit 66 that controls the amount of rotation of the winding motor 54 when the loom 10 is in normal operation (steady operation), and preparations for starting the loom 10. And a pre-weaving position control unit 68 that controls the amount of rotation of the winding motor 54 to correct the position of the pre-weaving 22 in the moving direction of the warp yarn 12 sometimes.

  A pressing signal S0 when the operator presses the operation button 72 of the loom 10 that is stopped is input to the main controller 70. The main control device 70 outputs the start 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 start preparation operation is sent to the sending control device 40 and the winding control device 62. 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.

  Various data used for calculating the basic speed of the winding motor 54 including the driving density and the correction amount of the pre-weaving position during the start-up preparation operation are preset in the pre-weaving position correction amount setting unit 82.

  The drive amount signal generator 76 performs the pre-weaving position correcting operation only for the period of time t2 shown in FIG. 4D when the activation preparation signal S7 is input. At the time of the weaving position correction operation, the driving amount signal generator 76 sets the driving amount (rotation amount) of the winding motor 54 based on the correction amount set in the weaving position correction amount setting unit 82 in the form of a pulse. The position control signal S11 is converted and supplied to one input terminal of the adder 86 of the synchronization controller 66.

  The synchronization control unit 66 calculates the basic speed of the winding motor 54 based on the driving density set in the pre-weaving position correction amount setting unit 82 and the spindle rotation angle signal S4, and drives the winding motor 54. A basic rotation amount signal generator 84 is provided.

  The basic rotation amount signal generator 84 rotates the winding motor 54 to a rotation amount corresponding to the rotation of the main shaft 46 by rotating the winding motor 54 at a speed corresponding to the basic rotation speed of the main shaft 46 during normal operation of the loom 10. be able to.

  Specifically, the basic rotation amount signal generator 84 receives the spindle rotation angle signal S4 during normal operation of the loom 10, and performs winding based on the received spindle rotation angle signal S4 and various data such as driving density. A pulse-like basic rotation amount signal S 10 corresponding to the basic speed of the take-up motor 54 is supplied to the other input terminal of the adder 86.

  The adder 86 inputs both the pulsed pre-weaving position control signal S11 input to one input terminal and the pulsed basic rotation amount signal S10 input to the other terminal. The adder 86 outputs the pulse signal from the two input terminals to the addition terminal of the forward / reverse counter 88 as the winding target value signal S12.

  In 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 a pulse-shaped basic rotation amount signal S10 to the adding unit 86. Not. Therefore, the pulsed winding target value signal S12 output from the adder 86 to the forward / reverse counter 88 is only the signal from the driving amount signal generator 76, that is, the weaving position control signal S11.

  The forward / reverse counter 88 counts the pre-weaving position control signal S11 input from the adder 86, and the pulse value of the roll rotation angle signal supplied from the encoder 60 connected to the output shaft of the winding motor 54. Subtract in S5. The count value of the forward / reverse counter 88 is supplied to the driver 90 as a winding drive signal S13.

  The driver 90 is an amplifier circuit that amplifies the input signal and rotates the winding motor 54. If the winding drive signal S13 from the forward / reverse counter 88 is positive, the winding motor 54 is rotated forward and negative. If there is, the winding motor 54 is reversed. Thereby, the pre-weaving position of the warp 12 is moved to a desired position.

  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.

  For example, the take-up motor 54 is a servo motor, and the feedback circuit I is composed of a known circuit for controlling the take-up motor 54.

  When the start preparation signal S7 is inputted, the command generator 78 starts the start control signal after the time t1 shown in FIG. 4E has elapsed based on the start delay time signal S8 set in the setter 80. S9 is output to the switch 74 shown in FIG.

  As shown in FIG. 3, the delivery control device 40 receives the tension signal S3 from the warp tension sensor 44 in the controller 96 of the operation time control unit 94 and the controller 100 of the start time control unit 98. The operation control unit 94 includes a basic speed signal generator 102 to which a driving density signal and a spindle rotation angle signal S4 of the spindle 46 are input.

  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 sends the 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.

  The controller 96 obtains the difference between the actual tension detected by the warp tension sensor 44 and the tension setting value set in the tension setting device 106, and the rotational speed at which the obtained tension difference should be corrected by the PID controller or the like. And the converted corrected speed signal S15 is output to the other input terminal of the adding unit 104.

  The adder 104 adds the speed signal S14 and the corrected speed signal S15, and outputs a normal operation speed signal S16 to the switch 74.

  The controller 100 obtains 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. The startup speed signal S17 is converted to the converted startup speed signal S17, and the converted startup speed signal S17 is output to the other input terminal of the switch 74.

  The switch 74 selectively switches the input normal operation speed signal S16 or the start speed signal S17 based on the input of the operation signal S6 or the start time control start command signal S9, and selects the selected signal S16 or S17. The speed signal S18 is output to the winding diameter corrector 110.

  When the time t1 elapses after the operation button 72 is pressed, the command generator 78 outputs a startup 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 unit 98 to the selected state and outputs the start-up speed signal S17 as the speed signal S18 to the winding diameter corrector 110.

  The value of the speed signal S18 selected by the switch 74 at both the start-up and normal operation corresponds to the speed of the warp 12 to be sent out from the delivery beam 14. However, since the warp winding diameter of the delivery beam 14 gradually decreases as the warp 12 is delivered, in order to keep the warp delivery amount from the delivery beam 14 constant, the rotational speed of the delivery beam 14 depends on the winding diameter. Need to be corrected. Therefore, the speed signal S18 from the switch 74 is corrected based on the winding diameter signal S1 detected by the winding diameter sensor 38.

  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 the correction signal S19 to one input terminal of the subtractor 112.

  As a result, the delivery control device 40 causes the controller 100 to be in the selected state only for the period of time t3 (see FIG. 4E), and causes the delivery motor 34 to perform the warp tension adjustment operation. The time t3 is set to a different time depending on the tension deviation and the internal gain of the controller. Accordingly, the time t3 is obtained in advance by actually measuring several times with different warp tension values.

  The warp tension adjusting operation is performed so that the tension of the warp 12 is adjusted to the tension setting value T2 set in the tension setting unit 108 even when the pre-weaving position correcting operation is performed.

  The rotational speed of the output shaft of the delivery motor 34 is detected by the tachometer 42 connected to the output shaft, and is output to the other input terminal of the subtractor 112 as the delivery rotational speed signal S2.

  The subtracting unit 112 subtracts the transmission rotational speed signal S2 from the selected speed signal S18, outputs the subtraction result to the driver 114, and drives the transmission motor 34. Therefore, the delivery control device 40 functions as a component of the feedback circuit II that controls the delivery motor 34 so that the speed of the warp 12 delivered from the delivery beam 14 becomes a speed according to the correction signal S19.

  As shown in FIG. 4, after the pre-weaving position correction operation is completed, the times t1, t2, and t3 are set so that the warp tension adjustment operation is completed (specifically, the relationship of t2 <t1 + t3 is satisfied). These are preset in the main controller 70, the pre-weaving position correction amount setting device 82, and the setting device 80. For this reason, there is an overlapping time t4 (from the time t1 after the operation button 72 is pressed until the time t2 has elapsed after the operation button 72 is pressed). Therefore, the loom 10 corrects the pre-weaving position and adjusts the warp tension.

  Preferably, the relationship between the time t3 and the time t1 is stored in advance in a database corresponding to the tension deviation, and the time t1 is read from the setting device 80 corresponding to the deviation detected immediately before the start of the loom preparation to determine the time t1. Then, each operation is started.

  However, even if the pre-weaving position correcting operation and the warp tension adjusting operation are performed at the same time, the position of the pre-weaving 22 is hardly affected by the warp tension adjusting operation and is mainly adjusted by the pre-weaving position correcting operation.

  More specifically, as described above, there are the components such as the kite frame 18, the kite 20, the heald, and the dropper between the delivery beam 14 and the weave 22, and friction between these and the warp yarn 12. Therefore, even if the warp 12 is moved by rotating the delivery beam 14, most of such movement is absorbed by the friction of the reed frame 18 and reed 20 and the position of the front 22 is in the warp moving direction. Little forward and backward movement.

  Further, since there is little intervening between the clothing roll 28 and the weave 22 and the distance between the clothing roll 28 and the weave 22 is small, the movement of the woven fabric 24 in the warp movement direction by the rotation of the clothing roll 28 is It is reliably transmitted to the woven fabric 24 itself. For this reason, the position of the weaving front 22 is reliably moved to the upstream side or the downstream side in the warp moving direction by rotating the clothing winding roll 28 by the pre-weaving position correcting operation. Therefore, the generation of the weaving step is surely prevented.

  When the time t2 elapses after the operation button 72 is pressed, the pre-weaving position correcting operation is completed, but the warp tension adjusting operation is continuously performed. However, the position of the woven fabric 22 hardly deviates even when the warp tension adjusting operation is performed.

  More specifically, as described above, there are equipment such as the reed frame 18, reed 20, heald, dropper and the like between the delivery beam 14 and the pre-weave 22, and the presence of these supplies causes the warp yarn 12 to exist. Friction occurs. For this reason, even if the warp 12 is moved by rotating the delivery beam 14, it is difficult to accurately transmit the warp 12 to the front 22 due to friction of the reed frame 18, reed 20 and the like. Therefore, even if the warp tension adjusting operation is performed, the position of the front weave 22 hardly moves, and the occurrence of the weaving step is surely prevented.

  Further, since the rotational force of the delivery beam 14 is accurately transmitted to the warp 12 wound around the delivery beam 14, the relationship between the rotational force of the delivery beam 14 and the tension of the warp 12 is clear, and the adjustment of the warp tension is performed. It is suitable for.

  When time t3 has elapsed, the warp tension adjusting operation is completed. Thereby, the pre-weaving position correcting operation and the warp tension adjusting operation are once completed.

  Next, main controller 70 outputs operation signal S6 to switch 74 to cause loom 10 to start normal operation.

  As shown in FIG. 3, when the operation signal S6 is input, the switch 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. To do.

  As described above, the controller 96 converts the warp yarn 12 into the correction speed signal S15 corresponding to the rotational speed to be corrected so that the tension value of the warp 12 becomes the tension setting value T1 set in the tension setting device 106. The converted corrected speed signal S15 is output to one input terminal of the adding unit 104.

  During normal operation, the basic rotation amount signal generator 84 and the basic speed signal generator 102 shown in FIG. 2 and FIG. 3 are associated with weaving based on the driving density and the rotation angle signal S4 of the rotating main shaft, respectively. The basic rotation amount signal S10 and the 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.

  The driving amount signal generator 76 does not output the pre-weaving position control signal S11 to the adding unit 86 because the pre-weaving position correction operation has been completed.

  The above-mentioned pre-weave position correction operation has been described for the case where the warp tension adjustment operation is started after the start of the pre-weave position correction operation and then the pre-weave position correction operation is ended. The warp tension adjusting operation may be started. In this case, a signal indicating the completion of the pre-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 adjustment operation.

  In the above embodiment, the warp tension adjusting operation is started after the lapse of time t1 from the start of the weaving position correcting operation. However, the time t3 of the warp tension adjusting operation is the time t2 of the pre-weaving position correcting operation. When the time t1 is sufficiently large, the time t1 can be shortened, or further, the time t1 = 0 can be set (that is, the pre-weaving position correcting operation and the warp tension adjusting operation are started simultaneously). .

  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 warp tension that occurs during the loom stop period. More specifically, problems are unlikely to occur when the machine is stopped for a long period of time, but when the cause of the stoppage is quickly repaired and the amount of decrease in warp tension is small, the period required for the warp tension adjustment operation is shortened. In other words, when the repair is performed promptly, the end of the pre-weaving position correcting operation may be delayed later than the end of the warp tension adjusting operation, and the conventional problem may occur. For this reason, preferably, when the deviation amount of the warp tension just before the start preparation is small, the time t1 is lengthened so that the end of the warp tension adjustment operation is delayed from the end of the pre-weaving position correction 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 according to 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.

  Referring to FIG. 5, the delivery control device 40 and the winding control device 62 change the value of the pre-weaving position control signal S11 of the pre-weaving position correction operation based on the value of the warp tension, thereby correcting the pre-weaving position. Adjust the operation time.

  More specifically, the startup control unit 98 of the delivery control device 40 calculates the difference ΔT between the tension value T2 set in the tension setting device 108 and the tension signal S3 detected by the warp tension sensor 44, While outputting to the controller 100, it outputs to the speed corrector 116.

  The speed corrector 116 uses a value K greater than 1 corresponding to the tension value difference ΔT as a speed command value signal S20 as a drive command signal in order to speed up the pre-weaving position correction operation according to the decrease in the tension value difference ΔT. It outputs to the generator 76. The relationship between ΔT and K may have a relationship based on a table measured in advance by experiments, 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 constant.

  When the speed command value signal S20 is input, the drive amount signal generator 76 multiplies the value set in the pre-weave position correction amount setter 82 by K and outputs it to the adder 86 as a pre-weave position control signal S11. Thereby, the pre-weaving position control signal S11 becomes a larger value than the pre-weaving position control signal S11 output from the drive amount signal generator 76 shown in FIG. In other words, the rotational speed of the winding roll 28 during the pre-weaving position correction operation is made faster than the rotational speed of the clothing winding roll 28 during the normal pre-weaving position correction operation to shorten the time required for the pre-weaving position correction operation. Yes. In this way, the warp tension adjusting operation is completed after the pre-weaving position correcting operation is completed.

  In FIG. 6, the horizontal axis indicates the time axis, and the vertical axis indicates the winding speed corresponding to the pre-weaving 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 weave 22 (pre-weave position correction amount).

  6A and 6B, it can be seen that the time t2 of the pre-weaving position correcting operation is shortened when the winding speed is increased. For this reason, by shortening the period of the pre-weaving position correcting operation, the end time of the tension adjusting operation can be apparently delayed.

  Referring to FIG. 7, the delivery control device 40 and the winding control device 62 change the value of the speed signal S17 at the start of the warp tension adjustment operation based on the setting value of the setting device 82 for the pre-weaving position correction amount. Then, an example of adjusting the time required for the warp tension adjusting operation will be shown.

  When the pre-weaving position correction amount is set to a large value, the tension adjustment operation end time is increased by apparently lengthening the tension adjustment operation time by decreasing the output value of the tension adjustment operation start speed signal S17. Delay.

  Specifically, the time t2 of the pre-weaving position correction operation is independent of the set correction amount of the pre-weaving position (that is, driven at a speed calculated so that the time t2 of the pre-weaving position correction operation is constant). The value of the gain signal S21 of the gain corrector 118 of the controller that works at startup is reduced.

  7 once obtains the time t3 of the warp tension adjusting operation, and from the relationship with the time t2 of the pre-weaving position correcting operation, the gain signal S21 in the tension adjusting operation or the speed command of the pre-weaving correcting operation. By changing the value signal S20, the end time of the tension adjustment operation may be delayed from the end time of the pre-weaving position correction operation.

  More specifically, the winding control device 62 outputs the value set in the pre-weave position correction amount setting unit 82 to the gain correction unit 118. The gain corrector 118 outputs to the controller 100 a gain signal S21 corresponding to a positive real number K2 of 1 or less according to the value set in the pre-weave position correction amount setting unit 82.

  When the gain signal S21 is input, the controller 100 multiplies the difference value between the tension setting unit 108 and the tension signal S3 by a coefficient K2 having a value less than 1, and outputs the result as a startup speed signal S17. As a result, 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. Thereby, the time required for the warp tension adjusting operation is lengthened, and the end timing of the pre-weaving position correcting operation is apparently accelerated.

  6 and 7, the speed correction amount and the gain are changed when a large value is set as the pre-weaving position correction amount. However, 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 warp tension that occurs during the loom stop period. More specifically, problems are unlikely to occur when the machine is stopped for a long period of time, but when the cause of the stoppage is quickly repaired and the amount of decrease in warp tension is small, the period required for the warp tension adjustment operation is shortened. In other words, when the repair is performed promptly, the end of the pre-weaving position correcting operation may be delayed later than the end of the warp tension adjusting operation, and the conventional problem may occur.

For this reason, preferably, when the deviation amount of the warp tension just before preparation for starting is small, the speed correction is performed so as to increase the speed during the pre-weaving position correction operation, or the gain corrector so as to decrease the rotation speed of the delivery beam. For example, the end of the warp tension adjustment operation may be made later than the end of the pre-weaving position correction operation. Preferably, the warp tension deviation signal is input to the speed corrector and gain corrector shown in FIGS. 6 and 7, and a plurality of correction coefficients and gains are set according to the tension deviation to generate the start preparation signal S7. In some cases, a corresponding correction coefficient or gain can be selected based on the detected tension deviation.

  Furthermore, each operation time of the pre-weave position correction operation and the warp tension adjustment operation is estimated, the time difference between the start timing of the pre-weave position correction operation and the warp tension adjustment 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.

  The time difference between the timing for starting the pre-weaving position correction operation and the timing for starting the warp tension adjustment operation is set to one value or a value selected according to an element that causes a variation in warp tension from a preset value. Also good. For example, factors that cause the variation in warp tension may be the warp tension setting value, the warp opening amount, etc. in addition to the loom stop time as described above. The main spindle crank angle when the loom is stopped can be considered as related to the warp entry amount.

  The rotational speed of the winding roll 28 during the pre-weaving position correction operation may be faster than the rotational speed of the clothing roll 28 during the normal pre-weaving position correction operation, and the period required for the pre-weaving position correction operation may be shortened.

  The rotational speed of the delivery beam 14 during the warp tension adjusting operation may be slower than the rotational speed of the delivery beam 14 during the normal pre-weaving position correcting operation, and the period required for the warp tension adjusting operation may be lengthened.

  The speed difference between the rotational speed of the winding roll 28 during the pre-weaving position correction operation and the rotational speed of the clothing winding roll 28 during the normal pre-weaving position correction operation can be calculated from one value or a preset value of the warp tension. It may be a value selected according to an element that causes variation.

  The clothing roll 28 may be rotated forward or backward during the start-up preparation period. More specifically, the pre-weaving position correcting operation is not limited to being performed only once at the time of preparation for starting the loom, but may be performed twice. It is possible to rotate two times in the same direction (for example, both forward and reverse), or in different directions (forward to reverse, or reverse to forward). .

  On the other hand, the warp tension adjusting operation may be performed for each pre-weaving position correcting operation or may be performed during the final pre-weaving position correcting operation. Note that the pre-weaving position correcting operation can be performed not only twice but three times or more.

  In the detection of the warp tension, the load acting on the back roller 16 is detected by the warp tension sensor 44 to detect the tension of the entire warp. However, the tension of a part of the warp 12 may be detected.

  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.

  The warp tension sensor 44 is provided on the back roller 16 to detect a load acting on the back roller 16, but may be provided on any member that contacts the warp 12 or the woven fabric 24.

  The loom 10 shown in FIGS. 1 to 4 controls the clothing roll 28 and the delivery beam 14 with separate circuits, but may be configured to control the clothing roll 28 and the delivery beam 14 with a single control circuit. .

  The generators 76, 78, 84, the controllers 96, 100, the winding diameter corrector 110, and the feedback circuits I, II may be realized by software processing using a microcomputer in addition to hardware processing.

  The present invention may be applied to the loom 10 of the change weave. For example, in a loom that selectively switches a plurality of weft densities according to the number of weft insertion picks, the amount of pre-weaving position correction operation at the time of activation is set according to the weft density at the time of activation rather than a constant value. Alternatively, in a loom that switches the warp target tension according to the switching of the weft density, the target warp tension at the start is set according to the target warp tension corresponding to the weft density at the start.

  The internal configuration of the controller 96 is PID control, but it may be a known controller or a more simplified control. Simplified control may consist of a comparator that compares the warp tension with the set value and a speed command output circuit that switches the speed command output state based on the comparison result. A value may be output, and the output may be stopped when the set tension is reached.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is the schematic of the loom provided with the weaving step prevention apparatus which concerns on this invention. It is a block diagram which shows one Example of the winding control apparatus which comprises a part of weaving prevention apparatus shown in FIG. It is a block diagram which shows one Example of the transmission control apparatus which comprises a part of weaving prevention apparatus shown in FIG. It is a time chart for demonstrating operation | movement of the weaving step prevention apparatus shown in FIG. It is a block diagram which shows the modification of the weaving step prevention apparatus which concerns on this invention. It is the figure which represented the output with respect to time for demonstrating operation | movement of the speed corrector of the weaving prevention apparatus shown in FIG. It is a block diagram which shows another modification of the weaving step prevention apparatus which concerns on this invention.

Explanation of symbols

I, II Feedback circuit S0 Press signal S1 Roll diameter signal S2 Transmission rotation speed signal S3 Tension signal S4 Spindle rotation angle signal S5 Roll rotation angle signal S6 Run signal S7 Start preparation signal S8 Start delay time signal S9 Start control signal at start S10 Basic rotation amount signal S11 Weaving position control signal S12 Winding target value signal S13 Winding drive signal S14 Speed signal S15 Correction speed signal S16 Speed signal during normal operation S17 Speed signal at start-up S18 Speed signal S19 Correction signal S20 Speed command value signal S21 Gain signal t1 Time (period) from the start of the pre-weaving position correction operation to the start of the warp tension adjustment operation
t2 Pre-weaving position correction operation time (period)
t3 Warp tension adjustment operation time (period)
t4 Time (period) during which the pre-weaving position correction operation and the warp tension adjustment operation overlap
DESCRIPTION OF SYMBOLS 10 Loom 12 Warp 14 Sending beam 16 Back roller 18 Hail frame 20 Kun 22 Weaving 24 Weaving cloth 26 Guide roller 28 Clothing roll 30 Press roll 32 Fabric winding beam 34 Sending motor 36, 56 Gear mechanism 38 Winding diameter sensor 40 Sending control device 42 Tacho generator 44 Warp tension sensor 46 Main shaft 48, 50 Motion conversion mechanism 52 Weft 54 Winding motor 58, 60 Encoder 62 Winding control device 64 Winding torque adjustment mechanism 66 Synchronous control unit 68 Weaving front position control unit 70 Main control device 72 Operation button 74 Switching device 76 Driving amount signal generator 78 Command generator 80 Setting device 82 Weaving pre-position correction amount setting device 84 Basic rotation amount signal generator 86 Adder 88 Forward / reverse counter 90, 114 Driver 94 Control unit 96 during operation Controller 98 Control unit at start-up 100 Controller 02 basic speed signal generator 104 adding unit 106, 108 tension setter 110 reel diameter corrector 112 subtraction section 116 speed corrector

Claims (5)

After completion of the start-up preparation operation including the pre-weaving position correcting operation for rotating the clothing roll to move the pre-weaving position to a predetermined position and the warp tension adjusting operation for adjusting the warp tension to a predetermined value by rotating the delivery beam A method of preventing a weaving step that causes a loom to operate normally,
The operation time of the pre-weave position correction operation, the operation time of the warp tension adjustment operation, and the time difference when there is a time difference between the start time of the pre-weave position correction operation and the start time of the warp tension adjustment operation Regarding the following control for either
a) controlling an operation time of the pre-weaving position correcting operation based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation;
b) The operation time of the warp tension adjusting operation is controlled based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation or a set correction amount of the pre-weaving position correcting operation. And c) controlling the time difference based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation, thereby performing the weaving A method for preventing a weaving step of a loom, wherein the warp tension adjusting operation is ended after a front position correcting operation is completed.   The start timing of the warp tension adjusting operation is set after the pre-weaving position correcting operation is started, and the control of a) or b) is performed to end the warp tension adjusting operation and the pre-weaving position correcting operation. The method for preventing a weaving step of a loom according to claim 1, wherein the weaving step is terminated after the finishing.   The weaving step prevention method for a loom according to claim 2, wherein a start time of the warp tension adjusting operation is set before the pre-weaving position correcting operation is completed.   The loom weaving step prevention method of a loom according to claim 1, wherein the control of b) is performed by changing a gain used for obtaining a rotation speed of the transmission beam based on the deviation based on the set correction amount. . A pre-weaving position corrector that rotates the clothing roll to move the pre-weaving position to a predetermined position;
A warp tension adjuster that rotates the delivery beam to adjust the warp tension to a predetermined value;
A weaving step prevention device including a main controller that starts a normal operation of the loom after the pre-weaving position correcting operation by the pre-weaving position corrector and the warp tension adjusting operation by the warp tension adjuster are completed in the start-up preparation period. And
The main controller includes an operation time of the pre-weaving position correcting operation by the pre-weaving position corrector, an operating time of the warp tension adjusting operation by the warp tension adjuster, and the pre-weaving position by the pre-weaving position corrector. Regarding the following control about any time difference when a time difference is given between the start time of the correction operation and the start time of the warp tension adjustment operation by the warp tension adjuster,
a) controlling an operation time of the pre-weaving position correcting operation based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation;
b) The operation time of the warp tension adjusting operation is controlled based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation or a set correction amount of the pre-weaving position correcting operation. C) controlling the time difference based on a deviation between a set tension value for starting preparation and a warp tension value detected immediately before the starting preparation operation;
A weaving step prevention device for a loom that performs any one of the above and terminates the warp tension adjusting operation after the pre-weaving position correcting operation is completed.

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