JP5096509B2 - Method for monitoring warp tension in a loom - Google Patents

Description

  The present invention detects a warp tension as a warp tension value over a plurality of rotation angles of the main shaft set in advance in a unit detection period including a cycle period in which the main shaft makes one rotation, and a detection unit period. An average warp tension value, which is an average value of a plurality of warp tension values detected at the time, is calculated, and the warp tension value is brought close to the target warp tension value based on a deviation between the average warp tension value and the set target warp tension. Assuming a loom that calculates a correction amount related to the warp sending amount and executes warp tension control for controlling the warp sending amount by the warp sending device based on the correction amount, the warp detected in such a loom The present invention relates to a warp tension monitoring method for monitoring a tension value.

  During weaving, the rotation of the output shaft of the drive motor or the rotation of the main shaft is transmitted to the warp beam on which the warp is wound and the roll beam on which the woven fabric is wound via the reduction gear. Let The warp is fed from the rotated warp beam. The sent warp is connected to the woven fabric before weaving. The woven fabric is taken up by a cloth beam. In such a loom, the rotation of the warp beam and the cloth winding beam is stopped during the stoppage (see Patent Document 1).

  The cause of the stop stage (stop stage) associated with the stoppage and start-up of the weaving stage, especially the loom, is due to the change in the tension state due to the change in the warp tension during the stop and the decrease in the warp tension during the stop. There is a thing by movement before weaving. Here, there are so-called thin and thick stages depending on the weft density.

  However, an operator who has discovered the occurrence of such a weaving step cannot identify the cause of the weaving step only by looking at the state of the weaving step appearing on the woven fabric. Therefore, it takes time to adjust the loom to suppress the generation of the weaving steps.

  In the weaving machine, arbitrary speed control different from control during normal operation is performed in order to suppress the occurrence of weaving steps over a period from immediately after startup to the warp sending speed and the number of sending pitches set in advance by the operator. When executing, the operator knows in advance the control period during which the arbitrary speed control is executed.

  On the other hand, when executing the control for controlling the warp sending based on the warp tension value from the start of the loom until the warp tension is within the predetermined range, the warp tension is within the predetermined range. Since the control period until the time varies depending on the yarn type, state, warp tension, etc., the operator cannot grasp the control period.

  As a result, the operator cannot identify the portion woven during the control period just by looking at the woven fabric in which the weaving step has occurred immediately after activation, and therefore cannot make adjustments for suppressing the weaving step promptly. .

JP 2003-201650 A

  An object of the present invention is to provide an operator with information for suppressing a weaving stage that occurs in a predetermined period immediately after the start of a loom.

  The method for monitoring the warp tension in the loom according to the present invention for achieving the above object is to start detecting the warp tension value from the start of the weaving machine after the start of the loom and to detect the warp tension value. Suppression that the control gain for calculating the correction amount as the warp tension control immediately after the start of the start based on the warp tension value is smaller than the control gain for the warp tension control during steady operation The control is executed, and the warp tension control performed immediately after the start of the start has reached a stable state in which the average warp tension value or the difference between the warp tension value and the target warp tension value is within a predetermined range. When the stable state is detected, the suppression control is terminated and the control shifts to normal control, and the start-up fluctuation period from the start of the loom to the detection of the stable state Or and displaying information related to the length of the fabric in the start fluctuation period on the display.

  In the present invention, the variation period may be displayed in any of the number of picks, time, and woven fabric length.

  According to the warp tension monitoring method of the present invention, the information related to the start variation period from the start of the loom to the detection of the stable state or the length dimension of the woven fabric in the start variation period is displayed. Thereby, the operator was woven during the start-up fluctuation period until the stable time when the difference between the average tension value or the warp tension value and the target warp tension value falls within a predetermined range immediately after the start of the loom. The length of the woven fabric can be grasped. Therefore, the operator can confirm whether there is a thin step or a thick step by looking at the woven fabric woven during the activation variation period. Thereby, since the operator can adjust the loom by seeing the change in the weft density and unevenness of the weaving stage of the woven fabric, adjustment for preventing the weaving stage, particularly the stop stage can be easily performed.

  Referring to FIG. 1, in a loom 10, a warp 12 is drawn out from a delivery beam 14 around which the warp 12 is wound, and is connected to a weaving front 22 through a back roller 16, a plurality of reed frames 18 and reeds 20. Further, the warp 12 performs an opening movement in the vertical direction by the heel frame 18. Then, the weft 24 is inserted into the opening of the warp 12 formed by the opening movement, and a woven fabric 26 is formed in which the weft 24 is beaten on the front weave 22 by the heel 20. The woven fabric 26 is guided to the fabric winding beam 30 through the two turning rolls 28 from the cloth 22. The guided woven fabric 26 is wound around the cloth winding beam 30.

  Each reed frame 18 is reciprocated up and down by a motion conversion mechanism that receives the rotational motion of the main shaft 44 rotated by the main shaft motor 42 to open the warp yarns 12 up and down. Further, the reed 20 is swung by a motion conversion mechanism that receives the rotational movement of the main shaft 44, and hits the weft 24, which is inserted into the opening of the warp 12, against the weft 22.

  The delivery beam 14 is connected to a delivery motor 32 via a gear mechanism 36 constituted by a speed reduction mechanism 34 such as a gear, and is rotationally driven by the delivery motor 32 to send out a plurality of warps 12 in the form of a sheet. Further, the tension of the warp 12 delivered from the delivery beam 14 is detected by a warp tension sensor 38 that detects a load acting on the back roller 16.

  FIG. 2 shows a block diagram of the loom 10. The loom 10 includes a loom control device 40, a setting device 52 and a storage device 54 connected to the loom control device 40, and a display 56. The loom controller 40 includes a warp tension control unit 58, and the warp tension control unit 58 includes a calculator 50.

  An encoder 48 for detecting the rotation angle of the main shaft 44 is connected to the loom control device 40. Then, the rotation angle of the main shaft detected by the encoder 48 is supplied to the loom control device 40 as the main shaft rotation angle θ. The warp tension control unit 58 of the loom control device 40 is supplied with the warp tension detected by the warp tension sensor 38 as an actual warp tension value T.

  The operation button 60 is a switch that the operator presses at the start and end of the weaving operation. Each time the operator presses the operation button 60, a pulsed ON operation signal S1 is output to the loom control device 40. The loom control device 40 determines whether the input of the operation signal S1 is an operation command signal or a stop command signal based on the state of the spindle motor 44.

  In the setting device 52, in addition to the target warp tension value during steady operation, a target warp tension value for return operation, which is the warp tension value to be returned before the start of the operation of the loom, is set. The loom control device 40 executes the return operation before the start of operation only when the loom decreases during the stop period of the loom 10, and returns the detected warp tension value to the target warp tension value at the return operation. The feed motor 32 is controlled. In addition, the target warp tension value at the time of steady operation and return operation is set in advance by the operator before the start of operation of the loom. Further, the target warp tension value at the time of the return operation is a value that can be corrected even after the operation of the loom.

  Further, the loom control device 40 calculates the basic speed based on the winding diameter detected by the winding diameter sensor (not shown) so that the delivery speed of the warp yarn 12 becomes a predetermined speed, and according to the basic speed. The rotation of the output shaft of the feed motor 32 is controlled.

  The computing unit 50 computes a plurality of values related to the tension value of the warp 12 during a predetermined period after activation. In addition, a plurality of values related to the tension value of the warp 12 in a predetermined period from the start calculated by the calculator 50 are stored in the storage unit 54. Then, the display unit 56 displays a plurality of values stored in the storage unit 54 by the display controller 55 based on the display signal output from the storage unit 54.

  The computing unit 50 calculates an average value (average warp tension value) of the detected warp tension during the steady operation, and calculates the calculated average warp tension value and a target warp tension value during the steady operation (hereinafter, simply referred to as “warp tension value”). The deviation from the “target warp tension value” is calculated. Then, the warp tension controller 58 performs feedback control of the delivery motor 32 so that the calculated deviation is eliminated, that is, the calculated average warp tension value is brought close to the target warp tension value. The delivery motor 32 is controlled to rotate the output shaft based on the drive signal S2 from the warp tension controller 58.

  The loom control device 40 also controls the rotation of the output shaft of the winding motor 46 so that the peripheral speed of the woven cloth 26 wound around the cloth winding beam 30 is the same as the feed speed of the woven cloth 26.

  When an operation signal S1 generated when the operator presses the operation button 60 is input to the loom control device 40, the loom 10 starts to start and detects the warp tension.

  The operation period after the start of the loom 10 is a period until the warp tension value detected from the start of start is stabilized to a value close to the target warp tension value, and until the calculated deviation falls within a predetermined range. Are divided into a start-up fluctuation period and a steady operation period after the start-up fluctuation period.

  The warp tension controller 58 stores the detected warp tension value T in the storage device 54 every time the rotation angle θ of the main shaft 44 rotates, for example, 10 °. Then, the computing unit 50 calculates an average warp tension value, which is an average value of the warp tension values T, every time the detection unit period Tu elapses, based on the stored warp tension values T.

  The detection unit period Tu is a period including the cycle period Ts. In other words, the detection unit period Tu is a period composed of one or more cycle periods with the cycle period Ts as a unit. In the following description, the detection unit period Tu is the same as the cycle period Ts. However, the detection unit period Tu may be an integral multiple of the cycle period Ts. For example, the detection unit period Tu may be a weaving pattern period composed of a plurality of cycles.

  The cycle period Ts is, for example, 360 °, where the rotation angle θ of the main shaft 44 is 50 ° and the rotation angle after one rotation is 50 °. However, the start and end of the cycle period Ts may be the same rotation angle θ, and the cycle period may be a period corresponding to one rotation of the main shaft, for example, 360 ° from 0 ° to 0 ° after one rotation. There may be.

  The storage device 54 stores the average warp tension value in the monitoring period Tm from immediately after the start of the loom 10 until the end of the period including the detection unit period Tu. The monitoring period Tm is, for example, from immediately after the loom 10 is started to the 10th pick, that is, from the 10th cycle period Ts.

  As described above, the monitoring period Tm may be configured by a plurality of continuous cycle periods, or the cycle period Ts is used as a unit between one cycle period Ts and another cycle period Ts in the monitoring period Tm. One or more intermittent periods may be provided.

  When a weaving stage occurs immediately after the loom 10 is activated, when the operator depresses a predetermined button on the screen of the display 56, the storage device The average warp tension value in the monitoring period Tm stored in 54 is displayed on the display 56 via the display controller 55. Thereby, the worker can easily grasp the change in the average warp tension value during the monitoring period Tm.

  The displayed information on the warp tension value T in the monitoring period Tm is not limited to the average warp tension value as described above, and may be the minimum value or the maximum value of the warp tension value T.

  FIG. 3 is a graph showing a time-series change in the warp tension value T as a curve L1. Black circles C1 and C2 represent the maximum value and the minimum value of the warp tension value T in each detection unit period Tu. FIG. 4 is a graph of the warp tension value T when the detection unit period Tu is two continuous cycle periods Ts. In the drawing, the maximum value and the minimum value of the warp tension value T in each detection unit period Tu are indicated by black circles C1 and C2. FIG. 5 is a graph showing the average value of the maximum value and the average value of the minimum value of the warp tension value T in each cycle period Ts when the detection unit period Tu is two continuous cycle periods Ts. FIG. 6 is a graph showing the maximum value and the minimum value of the warp tension value T when one cycle period Ts in which no warp tension is detected is placed after the detection unit period Tu in the monitoring period Tm. FIG. 7 is a graph showing an average value of the maximum value and the minimum value of the warp tension value T in each detection unit period Tu.

  Next, an example of changing the sending control pattern during operation of the loom will be described. There are three possible transmission control patterns: arbitrary speed control, suppression control, and normal control. In this embodiment, when changing the sending control pattern in the order of arbitrary speed control, suppression control, and normal control from the start of the loom, before and after the time point when each sending control pattern is changed to another sending control pattern. An example of storing a history of average warp tension values will be described.

  Arbitrary speed control is control for rotating the output shaft of the feeding motor regardless of the detected change in warp tension value. Specifically, a speed pattern (a predetermined warp feed speed and a predetermined period, for example, the number of picks) is set by the setting device 52, and the loom control device 40 controls the feed motor based on the set speed pattern.

  The suppression control is also referred to as insensitive control, and is control that suppresses fluctuations in the rotational speed of the output shaft of the delivery motor by reducing the control gain in normal control.

  More specifically, the calculator 50 sets a control gain at the time of restraint control in the setter 52 in advance, and after starting the loom, the calculator 50 calculates an average warp tension value in each detection unit period Tu. The control gain at the time of suppression control is smaller than the control gain at the time of normal control.

  Then, the calculator 50 calculates a deviation between the calculated average warp tension value and the target warp tension value. The computing unit 50 calculates a correction amount based on the control gain at the time of suppression control so that the calculated deviation is eliminated. The warp tension controller 58 controls the rotation of the output shaft of the feed motor 32 according to the calculated correction amount.

  As a result, the control gain at the time of restraint control is smaller than the control gain at the time of normal control, so the calculated correction amount is smaller at the time of restraint control than at the time of normal control where the same warp tension value was obtained. The fluctuation of the rotation speed of the output shaft of the delivery motor 32 is suppressed as compared with the normal control.

  In order to suppress the occurrence of the weaving step, warp feed control may be performed in the order of the control pattern of the suppression control and the normal control, but if the weaving step occurs even if such control is performed, it is optional. The warp feeding control is performed in the order of the control pattern of speed control, suppression control, and normal control.

  In the setting device 52, in addition to the speed pattern and the control gain, the number of average warp tension values to be stored before and after the time point when the delivery control pattern is changed is preset. In other words, the number of detection unit periods Tu in the monitoring period Tm is preset in the setting device 52.

  For example, in the monitoring period Tm, the number of detection unit periods Tu is two before and after the time point when the transmission control pattern is changed. That is, the monitoring period Tm is set to four detection unit periods Tu. The detection unit period Tu is one cycle period Ts.

  When the operation signal S1 is input to the loom control device 40, immediately after the loom 10 starts to start, the loom 10 starts arbitrary speed control, and at the same time, the warp tension control unit 58 detects the warp detected in each detection unit period Tu. The average warp tension value of the tension value T is calculated. The calculated average value of warp tension is stored in the storage unit 54 as needed.

  When the loom is activated, it first weaves with arbitrary speed control. That is, in the loom, weaving is performed by the loom control device 40 controlling the feed motor at a predetermined warp feed speed over a predetermined period based on a preset speed pattern.

  Next, when the arbitrary speed control for a predetermined period is completed, the loom then performs weaving with suppression control. That is, in the loom, weaving is performed by the loom control device 40 controlling the feed motor with a control gain smaller than the control gain in the normal control. This suppression control ends when the warp tension reaches a stable state, that is, when a preset end condition is satisfied. The end condition is, for example, as needed, when the difference between the stored average warp tension value and the target warp tension value reaches a predetermined range, or in a predetermined continuous detection unit period Tu, It is assumed that the difference from the target warp tension value has reached a predetermined range. The same applies to the case where the end condition is satisfied a predetermined number of times in a predetermined period.

  When the end point of the suppression control is reached, the loom shifts to the normal control. That is, in the loom, the sending control pattern in the loom control device 40 is changed from the suppression control to the normal control, and the weaving is continued.

  When a weaving stage occurs in the process from the start of the loom to the normal control as described above, the operator determines that the weaving stage has occurred when the delivery control pattern is changed, and switches from arbitrary speed control to suppression control. The warp average tension value of the monitoring period Tm including the time of change or the monitoring period Tm including the time of change from the suppression control to the normal control is displayed on the display 56. Thereby, the operator can grasp | ascertain the warp average tension value of the displayed monitoring period Tm.

  More specifically, the display controller 55 includes an arbitrary suppression change time point button that indicates the time point of change from the arbitrary speed control to the suppression control, and a suppression normal change time point button that indicates the time point of change from the suppression control to the normal control. The data is displayed on the display 56. The operator selectively presses the arbitrary suppression change time button and the suppression normal change time button.

  The display controller 55 reads the average warp tension value of the monitoring period Tm corresponding to the selected button from the storage unit 54 and causes the display unit 56 to display the read average warp tension value.

  The weaving steps are likely to occur before and after the change of the delivery control pattern. Therefore, even when a weaving stage occurs, the operator can properly correct the set value in each delivery control pattern by observing the change in the average warp tension value before and after the change point described above. In addition, the operator can estimate the cause of the occurrence of the weaving steps.

  FIG. 8 is an example in which the history of the average warp tension value is displayed on the screen of the display 56. In the example shown in the figure, the average warp tension value of each detection unit period Tu before and after the change from the suppression control to the normal control stored in the storage unit 54 is displayed on the display unit 56 as a history.

  Specifically, in the left half of FIG. 8, the average warp tension value detected in each detection unit period Tu in the suppression control (“insensitivity” in the drawing) is displayed. In the example shown in the drawing, average warp tension values corresponding to ten consecutive detection unit periods Tu before and after the time point of changing the delivery control pattern are displayed.

  Similarly, the average warp tension value corresponding to ten detection unit periods Tu consecutive from the time of changing the delivery control pattern in normal control is displayed on the right half of the screen.

  Therefore, the operator can grasp the change of the average warp tension value corresponding to the detection unit period Tu before and after the change of the delivery control pattern, such as the time of change from the suppression control to the normal control. It is possible to determine whether the cause of the weaving step is due to a change in warp tension or whether the set value of each control pattern is optimal.

  In addition, since the operator can grasp the amount of decrease in the average warp tension value with respect to the target warp tension value, the operator can determine the decrease amount that decreases the control gain of the delivery motor.

  In the example shown in the figure, the “normal” button at the top is selected, but when the operator presses the “constant speed” button, the history of the average warp tension value immediately after starting arbitrary speed control is displayed. By pressing the “Insensitive” button, the history of average warp tension before and after the change from arbitrary speed control to insensitive control is displayed.

  The display controller 55 may display the average warp tension value before and after the time when the control pattern is changed by the winding control by the winding device instead of the feeding control by the feeding device as described above on the display 56. Good. In this case, the warp tension value detected using a warp tension sensor different from the warp tension sensor 38 may be used for calculating the average warp tension value.

  Further, the average warp tension value calculated during the monitoring period Tm may be displayed on the display unit 56 as a graph with the vertical axis representing the monitoring period and the horizontal axis representing the monitoring period. Alternatively, the change of each average warp tension value and the change of the difference between the target warp tension values may be displayed on the display unit 56 as a graph. In this way, the operator can visually grasp the change in the average warp tension value.

  In the above description, the transmission control pattern is changed in the order of arbitrary speed control, suppression control, and normal control. However, the transmission control pattern of arbitrary speed control or suppression control may be omitted. That is, the control pattern performed after activation may be in the case of suppression control and normal control, or in the case of arbitrary speed control and normal control.

  Examples according to the present invention will be described below.

  The warp control device according to the present embodiment controls the warp sending device so that the warp tension value approaches the target warp tension value based on the detected warp tension value and the target warp tension value in the steady operation of the loom 10. . The warp control device detects a stable state indicating that the difference between the warp tension value and the target warp tension value is within a predetermined range.

  FIG. 9 shows the change in the average warp tension value, the change in the rotational speed of the feed motor, and the change in the weft density of the woven fabric on the display 56 when the warp sending control pattern is set to normal control immediately after the start of the loom. It is a thing. In addition, the change of FIG. 9A and FIG. 9B shown below may be displayed numerically, or may be displayed as a graph as shown in each figure.

  In the illustrated example, after the loom is started, the rotation of the output shaft of the winding motor is controlled so that the winding speed is always constant. The rotation control of the output shaft of the feed motor is performed by so-called PID control based on the warp tension. Thereby, the output shaft of the feeding motor is controlled so as to eliminate the deviation between the target warp tension value and the detected average warp tension value.

  FIG. 9A is a graph showing changes in the average warp tension value when the control gain of the delivery motor is set to a large value. In the illustrated example, the control gain of the delivery motor is 50.

  Referring to the drawing, the target warp tension value is set to 200 kg. The average warp tension value is lower than the target warp tension value immediately after starting the loom. In the start-up fluctuation period from the start of the start of the loom to a predetermined time, the average warp tension value increases immediately after the start of the loom and once exceeds the target warp tension value. In this embodiment, the start-up variation period is from the start of the loom to the 10th pick, that is, 10 cycle periods Ts.

  Thereafter, the average warp tension value decreases and changes to a value close to the target warp tension value. When the average warp tension value is stabilized in a state close to the target warp tension value, the operating state of the loom shifts to a steady state.

  FIG. 9B is a graph showing changes in the rotation speed of the delivery motor. Referring to this graph, immediately after the loom is started, the rotational speed of the feed motor temporarily increases to the steady rotational speed until the deviation is calculated. That is, the deviation is calculated as, for example, the difference between the average warp tension and the target warp tension value in each detection unit period Tu, but before the first detection unit period Tu immediately after the start of the loom. Since there is no detection period Tu, there is no average warp tension, and no deviation is calculated, so the delivery motor is driven to rotate at a steady rotational speed.

  When the loom control device 40 obtains the average tension value calculated from the first detection unit period Tu, the rotational speed of the output shaft of the feed motor is greatly reduced by a large gain, and then gradually the deviation is eliminated. Rotational speed increases and overestimation of deviation is eliminated. Then, the warp tension controller 58 determines that the steady state, that is, the state where the warp tension is stable, when the calculated deviation falls within a preset allowable value range. In other words, when the average warp tension value changes at a value close to the target warp tension value, the rotational speed of the output shaft of the feed motor becomes a steady rotational speed and is stabilized.

  Specifically, after the loom is started up, the winding motor rotates at a steady rotational speed, but by making the rotational speed of the feeding motor slower than the rotational speed of the winding motor, the warp is pulled and the warp tension value The average warp tension value increases. When the average warp tension value changes to substantially the same value as the target warp tension value, the rotation speed of the feed motor changes at a steady speed.

  On the other hand, when the average warp tension value is higher than the target warp tension value, the warp is loosened between the feed motor and the take-up motor by making the rotation speed of the feed motor faster than the take-up motor. As a result, the warp tension value and thus the average warp tension value can be reduced.

  As shown in FIG. 9B, when the control gain is large to some extent, the degree of change in the rotational speed of the delivery motor 32 at the time of startup increases, and the rotational speed of the output shaft of the delivery motor 32 increases or decreases in a short time. It becomes. Thereby, since the warp is not sent out at a constant speed, a large control gain of the feeding motor 32 causes a weaving step such as a thick step or a thin step.

  Referring to FIG. 9 (c), when the weft density of the woven fabric in the steady state is 50 yarns / 吋, the weft density increases immediately after the start of the loom and the weft density is at the peak. It can be seen from the graph that the weft density gradually decreases and reaches the steady weft density until the average warp tension value is stabilized at the target warp tension value.

  Thus, when the weft density is higher than the steady weft density, a thick step appears in the woven fabric. On the other hand, if the weft density is smaller than the steady weft density, a thin step appears in the woven fabric.

  In the normal control as described above, a period until the average warp tension value is stabilized to a value close to the target warp tension value (starting variation period) can be displayed on the display unit 56 using, for example, the number of picks. In the illustrated example, the activation variation period is 10 detection unit periods Tu (10 cycle periods Ts), that is, 10 picks.

  Since the operator can calculate the length dimension of the woven fabric from the displayed number of picks, the operator can visually check the woven fabric portion woven during the start-up variation period. The operator can visually identify changes in the length dimension and weft density of the weaving steps formed in the woven fabric.

  The operator adjusts the loom so as to suppress the weaving step by adjusting the control gain of the delivery motor 32. The control for suppressing the change in the rotational speed of the delivery motor 32 at the start-up by reducing the control gain of the delivery motor 32 and suppressing the weaving step is the suppression control shown in FIG.

  In the above description, the start-up variation period is indicated by the number of picks. However, the warp tension control unit 58 calculates the length dimension of the woven fabric during the start-up variation period using the preset weft density. The length dimension may be displayed on the display 56.

  FIG. 10 shows the change in the average warp tension value, the change in the rotational speed of the feed motor 32, and the change in the weft density of the woven fabric on the display 56 when the warp sending control pattern is set to the suppression control immediately after the start of the loom. It is shown. In addition, regarding the changes in FIG. 10A and FIG. 10B described below, numerical values may be displayed, or graphs may be displayed as illustrated.

  In the illustrated example, the warp sending control pattern is set as suppression control immediately after the start of the loom, and the change in the average warp tension value, the change in the rotational speed of the sending motor 32, the weft density at the time of change from the suppression control to the normal control. This shows the change. This is a case where the control gain of the delivery motor 32 is set to a small value, for example, 10. The winding motor always rotates at a steady rotational speed after the loom is started.

  Since the control gain of the suppression control shown in FIG. 10 (a) is smaller than the control gain of the normal control shown in FIG. 9 (a), the average warp tension value T is smaller than that of FIG. 9 (a). It continues to rise slowly and reaches the target warp tension value. That is, the degree of change in the average warp tension value in the suppression control in FIG. 10A is smaller than the degree of change in the average warp tension value in the normal control in FIG. Further, since the control gain of the suppression control is smaller than the control gain of the normal control, the period until the average warp tension value reaches the target warp tension value is long.

  FIG. 10B shows a change in the rotational speed of the output shaft of the delivery motor 32. Since the control gain of the suppression control is smaller than the control gain of the normal control, the degree of change in the rotational speed of the output shaft of the feed motor 32 in the suppression control shown in FIG. 10B is the same as that in the normal control shown in FIG. The degree of change in the rotational speed of the output shaft of the delivery motor 32 is small. Further, the period during which the average warp tension value in the suppression control reaches the target warp tension value is longer than the period during which the average warp tension value in the normal control reaches the target warp tension value.

  As described above, when the suppression control in which the control gain is smaller than that of the normal control is applied, the period during which the suppression control is applied becomes longer than the period during which the normal control is applied. However, the degree of change in the rotational speed of the delivery motor 32 when the suppression control is applied is smaller than the degree of change in the rotational speed of the delivery motor 32 when normal control is applied. Can be made smaller than when normal control is applied.

  The end timing of the suppression control can be set by the end condition. As described above, the end condition is, for example, the case where the average warp tension value reaches the target warp tension value, or the case where the average warp tension value becomes equal to the target warp tension value several times continuously.

  The degree of change in the weft density in the suppression control shown in FIG. 10C is smaller than the degree of change in the weft density in the normal control shown in FIG. 9C. Further, the weft density at the time when the weft density is highest (peak time) during the period in which the suppression control is applied is 51 yarns / 吋, which is substantially the same as the weft density during the steady operation of the loom.

  When a weaving stage occurs, the operator displays on the display section the period from the start of the loom in the suppression control until it stabilizes to the target warp tension value, that is, the period for applying the suppression control. Check the number of picks to make. The operator visually observes the state of occurrence of the weaving step in the actual woven fabric portion based on the confirmed number of picks, and adjusts the control gain of the feed motor 32.

  In this case, the operator does not have to reduce the control gain, and obtains the length dimension of the woven fabric corresponding to the period in which the suppression control is applied. Then, the operator confirms the degree and unevenness of the weft density of the woven fabric portion woven during the period in which the suppression control is actually applied, empirically adjusts the control gain of the feed motor 32, and generates the weave steps. Suppress.

  Thus, the suppression control is effective when the factor of the weaving step is related to the warp tension. If the weaving step to which the suppression control is applied is not resolved, or the warp tension value history shows that the amount of decrease in the average warp tension value is small (or the number of picks in the pick number display is small), it was judged that this is not a factor due to the drop in warp tension. In this case, the arbitrary speed control shown in FIG. 11 is performed.

  Depending on the period during which the suppression control is applied, when starting the next loom, it may be determined whether to apply the suppression control from the time of the startup. When the period during which the suppression control is applied is short, it can be determined that the decrease in the warp tension value T during that period was small.

  For example, an operator sets a predetermined threshold value in the setting device in advance. When the loom control device 40 determines that the warp tension value T or the average warp tension value in the immediately preceding suppression control is larger than the threshold value, the suppression control is performed in the next weaving. When the loom control device determines that the warp tension value T or the average warp tension value in the immediately preceding suppression control is smaller than the threshold value, the suppression control is not performed in the next weaving.

  In the above description, the case where the determination to perform the suppression control in the next weaving is automatically performed. However, the operator looks at the warp tension value T or the average warp tension value to determine whether to perform the suppression control. May be. Furthermore, the operator may set an optimum control gain in the suppression control, or the loom control device 40 may automatically calculate and set the optimum control gain.

  FIG. 11 shows changes in the rotational speed of the winding motor 46, changes in the rotational speed of the delivery motor 32, and changes in the average warp tension value when the warp delivery control pattern is set to an arbitrary speed control immediately after the start of the loom. FIG. In addition, the change of Fig.11 (a), FIG.11 (b), and FIG.11 (c) shown below may be displayed by a numerical value, and may be graphed and displayed as each figure.

  In the illustrated example, immediately after the start of the loom, the warp feed control pattern is set to an arbitrary speed control, and the change in the rotational speed of the winding motor and the rotation of the feed motor 32 at the time of change from the arbitrary speed control to the normal control. It shows changes in speed and average warp tension value. As described above, the arbitrary speed control is a control in which the output shaft of the feeding motor 32 is rotated with a specified speed pattern regardless of the detected warp tension value by the operator specifying the speed pattern. . Items for specifying the speed pattern include the rotational speed and the number of picks.

  For example, when a thick step occurs immediately after the start of the loom, the operator checks the history of the average warp tension value immediately after the start. When the operator determines that there is a decrease in the average warp tension value immediately after the start of the loom, the operator performs suppression control immediately after the start of the loom during the next weaving. However, the thick step has not been eliminated even if the suppression control is applied to the warp sending control pattern. The worker applies arbitrary speed control to the warp delivery control pattern instead of the suppression control.

  More specifically, the operator determined that the type of weaving step that was generated was thick and that the average warp tension value had decreased. Therefore, the operator uses the setting device 52 to set the rotation speeds of the output shafts of the feed motor 32 and the take-up motor 46 during the operation of the loom more quickly. Further, the operator increases the warp tension value T by increasing the rotational speed of the output shaft of the winding motor 46 faster than the rotational speed of the output shaft of the feed motor 32.

  FIG. 11A shows a change in the rotational speed of the output shaft of the winding motor 46. In the illustrated example, the rotation speed of the output shaft of the winding motor 46 in the arbitrary speed control is set to a speed corresponding to 120% of the speed in the normal control.

  FIG. 11B shows a change in the rotational speed of the output shaft of the delivery motor 32. In the illustrated example, the rotational speed of the output shaft of the delivery motor 32 in the arbitrary speed control is set to a speed corresponding to 110% of the rotational speed in the normal control.

  FIG. 11C shows a change in the average warp tension value when the rotational speed patterns of the output shafts of the winding motor 46 and the feeding motor 32 during the operation of the loom are specified as described above. In the illustrated example, since the rotational speed of the output shaft of the winding motor 46 is faster than the rotational speed of the output shaft of the delivery motor 32, the average warp tension value in the arbitrary speed control gradually increases as time elapses. For this reason, the weft density of the woven fabric gradually decreases.

  Therefore, immediately after the start of the loom as shown in FIG. 9C, a thick step (a step that occurs when the density is higher than the steady weft density) occurs in the woven fabric, and the suppression control is applied at the start of the loom. In the case where the thickness step of the woven fabric is not eliminated, the occurrence of the weaving step can be suppressed by applying the above-described arbitrary speed control after activation.

  In addition, even if the above arbitrary speed control is performed, the average warp tension value before and after the change from the arbitrary speed control to the normal control when the period until the target warp tension value is reached after starting the loom is long. Is lower than the target warp tension value, the rotational speed of the output shaft of the winding motor 46 is further made higher than the rotational speed of the output shaft of the feed motor 32. For example, the rotational speed of the output shaft of the winding motor 46 is 125% of the rotational speed during normal control, and the rotational speed of the output shaft of the delivery motor 32 is 105% of the rotational speed during normal control.

  Since the period during which the arbitrary speed control is applied is determined by the number of picks of the speed pattern, the operator can know in advance the period during which the arbitrary speed control is applied. When the change from the arbitrary speed control to the normal control is continuously performed as described above, the period during which the arbitrary speed control is applied (for example, 10 picks) and the average warp tension value after the normal control is started are set as targets. The period until the warp tension value is reached (for example, 5 picks) is added up, and the total period (15 picks) is displayed on the display unit 56. However, each period may be displayed on the display 56 separately. The same applies when the suppression control is applied instead of or in combination with the arbitrary speed control.

  In the illustrated example, one speed pattern is applied in a period in which the arbitrary speed control is applied. However, a plurality of speed patterns may be continuously applied in a period in which the arbitrary speed control is applied.

  In addition, each numerical value shown in the said Example is an example shown temporarily to demonstrate the Example to the last, and may differ from the time of actual weaving. The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is a schematic diagram of the loom to which the monitoring method according to the present invention is applied. It is a block diagram of the loom shown in FIG. It is a graph which shows the time-sequential change of a warp tension value. It is a graph which shows the time-sequential change of a warp tension value. It is a graph which shows the time-sequential change of a warp tension value. It is a graph which shows the time-sequential change of a warp tension value. It is a graph which shows the time-sequential change of a warp tension value. It is the figure which displayed the history of the average warp tension value of warp tension. 6 is a graph showing changes in average warp tension value, changes in the rotational speed of the feed motor, and changes in the weft density of the woven fabric when the warp delivery control pattern is set to normal control immediately after the loom is started. FIG. 6 is a graph showing changes in average warp tension value, change in the rotation speed of the feed motor, and change in weft density of the woven fabric when the warp sending control pattern is set to suppression control immediately after the start of the loom. A graph showing the change in the rotation speed of the winding motor, the change in the rotation speed of the delivery motor, and the change in the average warp tension when the warp delivery control pattern is set to an arbitrary speed control immediately after the start of the loom. is there.

θ Rotation angle T Warp tension value Tu Detection unit period Tm Monitoring period 10 Loom 12 Warp 14 Sending beam 16 Back roller 18 Reed frame 20 Reed 22 Weaving 24 Weft 26 Weaving cloth 28 Turning roll 30 Reeling beam 32 Feeding motor 36 Gear mechanism 38 Warp tension sensor 40 Loom control device 42 Spindle motor 44 Spindle 46 Winding motor 48 Encoder 50 Calculator 52 Setting device 54 Storage device 55 Display controller 56 Display device 58 Warp tension controller 60 Operation button

Claims (2)

The warp tension is detected as a warp tension value over a plurality of times in a unit detection period including a cycle period in which the spindle rotates once, and an average value of the plurality of warp tension values detected in the detection unit period The average warp tension value is calculated, and based on the deviation between the average warp tension value and the set target warp tension during normal operation, the warp send amount is set so that the warp tension value approaches the target warp tension value. In a loom that calculates a correction amount related to the warp tension and controls warp tension control for controlling the warp feed amount by the warp sending device based on the correction amount,
After starting the loom, the control for starting the detection of the warp tension value from the start of the start and calculating the correction amount as the warp tension control immediately after the start of the start based on the detected warp tension value Executing a suppression control in which the gain is a value smaller than the control gain for the warp tension control in the steady operation,
Detecting that the average warp tension value or the difference between the warp tension value and the target warp tension value has reached a stable state within a predetermined range in association with the warp tension control performed immediately after the start of the start ,
At the time when the stable state is detected, the suppression control is terminated and the routine shifts to normal control.
A method for monitoring warp tension in a loom, characterized in that information related to a start-up variation period from the start of the loom to detection of the stable state or a length dimension of the woven fabric in the start-up variation period is displayed on a display. The method for monitoring warp tension in a loom according to claim 1, wherein the start-up variation period is displayed by any one of the number of picks, time, and woven fabric length.

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