JP2006070389A - Warp tension monitoring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To give information to a worker for suppressing weaving bar defects formed during a prescribed period immediately after the start of a loom. <P>SOLUTION: The warp tension monitoring method detects the warp tension and monitors the detected tension of the warp. The monitoring method comprises a tension detecting step to detect the tension of the warp as a warp tension value, a representative value calculation step to calculate the representative value of the warp tension values detected during a unit detection period including a cycle period corresponding to the one rotation of a main shaft, a representative value storage step to store the representative value during the monitoring period from the time immediately after the start of the loom to the end of the period including one or more of the above detection unit periods, and a representative value displaying step to display the representative value stored in the representative value storage step. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a warp tension monitoring method for detecting warp tension and monitoring the detected warp tension.

  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, during the stoppage, the rotation of the warp beam and the cloth winding beam is stopped (see Patent Document 1).

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

  However, an operator who has discovered the occurrence of a weaving step cannot identify the cause of the weaving step only by looking at the weaving step appearing on the woven fabric. It takes time to adjust the loom.

  When the loom executes an arbitrary speed control for suppressing the occurrence of weaving steps, different from the normal operation, for a predetermined period after the start of the loom until the operator reaches the warp feed speed and the number of feed pitches specified in advance. The worker knows in advance a predetermined period during which the arbitrary speed control is executed.

  However, when the loom executes control for controlling the warp sending based on the warp tension value until the warp tension is within the predetermined range, the warp tension is within the predetermined range from the start of the loom. Since the control period until the time varies depending on the type, state and warp tension of the yarn, 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.

  Each of the first, second and third warp tension monitoring methods according to the present invention detects the warp tension and monitors the detected change in the warp tension.

  Furthermore, the first warp tension monitoring method according to the present invention is detected in a detection unit period including a tension detection step for detecting the warp tension as a warp tension value, and a cycle period in which the spindle rotates once. A representative value calculating step for calculating a representative value of the warp tension value, and a representative value storage for storing the representative value during a monitoring period from immediately after starting the loom until the end of a period including at least one detection unit period A representative value displaying step of displaying the representative value stored in the representative value storing step.

  Furthermore, the second warp tension monitoring method according to the present invention includes a warp state change step for changing the warp control pattern or a set value of the warp speed in a steady operation of the loom, and the warp tension is converted into a warp tension value. A tension detecting step for detecting the warp, a representative value calculating step for calculating a representative value of the warp tension value detected in a detection unit period including a cycle period in which the spindle makes one rotation, and the warp state changing step A representative value storing step for storing the representative value during a monitoring period including the detection unit periods before and after the detection, and a representative value displaying step for displaying the representative value stored in the representative value storing step.

  Furthermore, a third warp monitoring method according to the present invention includes a tension detection step of detecting the warp tension as a warp tension value, the detected warp tension value, and a steady operation target warp tension value in steady operation of the loom. A warp tension control step for controlling the warp feeding device so that the warp tension value approaches the steady operation target warp tension value, and a stable state detection step for detecting that the warp tension value has reached a stable state. And a start-up change period display step for displaying information related to a start-up change period from start-up of the loom to detection of the stable state or a length dimension of the woven fabric in the start-up change period.

  According to the first warp tension monitoring method, it is possible to display the representative value calculated in the representative value calculation step during the monitoring period from immediately after the start of the loom to the end of the period including the detection unit period. Thereby, the operator can grasp the warp tension value when the weaving stage is generated after the start only by confirming the representative value of the warp tension value. Further, the operator can grasp the change in the warp tension at the time when the weaving step occurs and the vicinity thereof by using a plurality of representative values displayed.

  The operator can easily determine whether or not the cause of the weaving step is the warp tension based on the information on the warp tension. In other words, by providing the operator with information that helps determine the cause of the occurrence of the weaving stage in this way, it becomes easier to estimate the cause of the weaving stage occurrence, and by adjusting the loom based on the estimated cause, The generation of the weaving step can be suppressed as well.

  According to the second warp tension monitoring method, the warp tension during the monitoring period including the detection unit period before and after changing the set value of the warp speed, that is, the sending speed or the winding speed in the steady operation of the weaving machine. A representative value can be displayed. Since weaving stages are likely to occur during such a monitoring period, by displaying the representative value in the monitoring period, the change in the warp tension value when the control pattern or the setting value of the warp speed is changed is grasped. can do.

  Thereby, the operator can determine whether the cause of the weaving step is the warp tension based on the information on the warp tension, and can determine whether the control pattern is selected or the warp speed is optimal. it can.

  The representative value may include an average value of the plurality of warp tension values detected during the detection unit period. Alternatively, the representative value may include a minimum value, a maximum value, a value related to the minimum value, or a value related to the maximum value of the warp tension value in the monitoring period. The representative value may include a value related to the warp tension value with respect to a predetermined rotation angle of the main shaft or a warp tension value with respect to the rotation angle of the main shaft in the monitoring period.

The monitoring period may include a plurality of the cycle periods, and the representative value may include an average value of a minimum value or an average value of a maximum value of the warp tension values in each cycle period in the monitoring period.

  The monitoring period may include a plurality of the cycle periods, and the representative value may include an average value of the warp tension values with respect to a predetermined rotation angle of the main shaft in the monitoring period.

  The monitoring period may include a plurality of continuous cycle periods.

  The monitoring period may include a plurality of cycle periods, and an intermittent period including the cycle period may be included between one cycle period and the other cycle period of the monitoring period.

  The first or second warp tension monitoring method further includes a speed detection step of detecting a feeding speed or a winding speed when the warp tension value is detected, and the display step is further detected. The feeding speed or the winding speed may be displayed in correspondence with the representative value of the warp tension value.

  If there is a change in the warp feeding speed or winding speed, the weaving stage is likely to occur because the warp tension value changes, so the estimation of the cause of the weaving stage corresponds to these representative values. It is easier to display.

  According to the third warp tension monitoring method, 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 can grasp the woven fabric length woven during the start-up variation period from the time immediately after the start of the loom until the time when the warp tension value is stabilized at the target warp tension value. 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. Moreover, you may display the information regarding the length dimension of the woven fabric in a starting variation period, for example, the number of picks, and time instead of displaying a starting variation period.

  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 wefts 24 that have been wefted are beaten on the front of the weave 22 by the scissors 20 to form a woven fabric 26.

  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.

  The delivery beam 14 is rotated by a delivery motor 32 via a gear mechanism 36 including a speed reduction mechanism 34 such as a gear, and sends out a plurality of warps 12 in the form of a sheet.

  The loom control device 40 controls the rotation of the output shaft of the delivery motor 32 based on the change in 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. To do.

  The value of the tension acting on the warp 12 is detected by a warp tension sensor 38 that detects the load acting on the back roller 16. The detected value of the warp tension is supplied to the loom control device 40 as the warp tension value T actually acting on the warp 12.

  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.

  The reed 20 is swung by a motion conversion mechanism that receives the rotational movement of the main shaft 44, and strikes the weft 24, which is inserted into the opening of the warp 12, against the weave 22.

  The rotation angle of the main shaft 44 is detected by the encoder 48. The detected rotation angle of the main shaft is supplied to the loom control device 40 as the main shaft rotation angle θ.

  The loom control device 40 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.

  FIG. 2 shows a block diagram of the loom 10. The loom 10 has a loom control device 40 having a computing unit 50 that calculates a plurality of values related to the tension value of the warp 12 during a predetermined period from the start, and a setter that sets a steady operation target tension value and a return operation target tension value. 52, a memory 54 for storing a plurality of values, and a display 56 for displaying the plurality of values. The display device 56 is displayed by the display controller 55 based on the display signal output from the storage device 54.

  The loom control device 40 controls the delivery motor 32 of the warp 12 so that the detected warp tension value is returned to the return operation target tension value only when the loom decreases during the stop period of the loom 10.

  The tension of the warp 12 is detected by the warp tension sensor 38, and the detected warp tension is output to the warp tension controller 58 as a warp tension detection 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 warp tension control unit 58 of the loom control device 40 includes a calculator 50. The calculator 50 calculates a plurality of values relating to the tension value of the warp 12 during a predetermined period from the start.

  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.

  The setter 52 has a steady operation target tension value and a return operation target tension value that is a tension value of a warp to be returned before the start of operation of the loom.

  As will be described later, the steady operation target tension value and the return operation target tension value in the case of performing the operation of returning the warp tension before activation are set in advance by the start of the operation of the loom. The return operation target tension value is a value that can be corrected even after the loom starts operating.

  The computing unit 50 computes a plurality of values related to the tension value of the warp 12 during a predetermined period from the activation described later.

  The calculator 50 calculates a deviation between the calculated average warp tension value and the steady operation target warp tension value. The warp tension controller 58 performs feedback control of the feed motor 32 so that the calculated deviation is eliminated, that is, the calculated average warp tension value is brought close to the steady operation target warp tension value.

  The storage device 54 stores a plurality of values related to the tension value of the warp 12 during a predetermined period from the start.

  The indicator 56 displays a plurality of values relating to the tension of the warp 12.

  The delivery motor 32 rotates the output shaft of the delivery motor 32 based on the drive signal S2 from the warp tension controller 58.

  The operator previously sets a steady operation target tension value, which is a target warp tension value during steady operation (in a steady state), using the setting device 52.

  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 at the same value as the steady operation target tension value until the calculated deviation is eliminated. It is divided into a certain startup fluctuation period and a steady operation period after the startup fluctuation period, in which the detected warp tension value is stabilized at the steady operation target tension value and the deviation is eliminated.

  [First embodiment]

  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 ° (tension detection step).

  Based on the input warp tension value T, the calculator 50 calculates a representative value of the warp tension value T every time the detection unit period Tu elapses (representative value calculation step). In this embodiment, the representative value is the average warp tension value.

  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 present embodiment, the detection unit period Tu is the same as the cycle period Ts.

  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 the start of the loom 10 to the end of the period including the detection unit period Tu (representative value storage step). 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 composed of a plurality of consecutive cycle periods, or 1 between the cycle period Ts and the other cycle period Ts of the monitoring period Tm. You may provide the above intermittent period.

  When a weaving stage occurs immediately after the loom 10 is activated, the operator presses a predetermined button on the screen of the display device 56. Thereby, since the average warp tension value in the monitoring period Tm stored in the storage unit 54 is displayed on the display unit 56 via the display controller 55 (representative value display step), the operator can calculate the average warp tension value in the inspection period Tm. The change of the warp tension value can be easily grasped.

  Here, since the monitoring period Tm corresponds to the tenth detection unit period Tu counted immediately after starting the loom 10, the display unit 56 displays the first to tenth average warp tension values. .

  Based on the first average warp tension value to the tenth average warp tension value and their time-series changes, the operator estimates the cause of the weaving stage and adjusts the loom.

  Specifically, when the first average warp tension value is significantly different from the steady operation target warp tension value, the tension return operation is set to be performed immediately before the start of the loom 10, or the delivery due to the decrease in warp tension immediately after the start is performed. A control gain for controlling the feed motor 32 is adjusted to be small so as to suppress a rapid fluctuation in the rotation speed of the output shaft of the motor 32.

  As described above, since the weaving stage is likely to occur immediately after the start, the operator can easily estimate the cause of the occurrence of the weaving stage by looking at the time-series change in the average warp tension value immediately after the start. .

  Further, since the average warp tension value, that is, the representative value of one detection unit period is displayed on the display device 56, the operator can grasp the warp tension value at that time, so that the adjustment of the loom becomes easy.

  [Modification 1 of the first embodiment]

  Although the detection unit period Tu has been described as being the same as the cycle period Ts, 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 storage device 54 stores the sending speed and the winding speed at the time when the rotation angle θ of the main shaft 44 passes a predetermined angle (for example, 0 °) and the corresponding representative value, and the sending speed and the winding speed. The corresponding representative value may be displayed on the display 56. In this case, the storage device 54 may display only the sending speed or the winding device on the display device 56 without displaying the representative value.

  [Modification 2 of the first embodiment]

  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 steady operation 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.

  [Modification 3 of the first embodiment]

  In the first embodiment, the average value of the warp tension value in the detection unit period Tu is displayed on the display unit 56, but at least the minimum value or the maximum value of the warp tension value T in the detection unit period Tu is displayed on the display unit 56. Also good.

  FIG. 3 is a glove showing the time-series change of the warp tension value T on the display 56 as a curve L1.

  Black circles C1 and C2 display the maximum value and the minimum value in each detection unit period Tu as representative values related to the tension of the warp 12. However, only the black circle with the maximum value or the minimum value may be displayed on the display unit 56.

  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 example shown in the figure, the representative values relating to the tension of the warp yarn 12 are represented by the black circles C1 and C2 with the maximum value and the minimum value of each detection unit period Tu. The maximum and minimum values of each cycle period Ts other than the black circles C1 and C2 are not displayed.

  FIG. 5 shows the average value of the maximum value of each cycle period Ts and the average value of the minimum value of each cycle period Ts as representative values regarding the warp tension when the detection unit period Tu is two continuous cycle periods Ts. 7 is a graph displayed on the display 56.

  FIG. 6 shows that the maximum value and the minimum value are displayed on the display unit 56 as representative values relating to the warp tension when one cycle period Ts in which the warp tension is not detected is placed after the detection unit period Tu in the monitoring period Tm. It is the displayed graph.

  FIG. 7 is a graph in which the average value of the maximum value and the minimum value in each detection unit period Tu is displayed on the display unit 56 as a representative value related to the warp tension. In the third modification, the display controller 55 may display a representative value corresponding to each black circle on the display 56 instead of the graph.

  [Modification 4 of the first embodiment]

  Although the above embodiment displays the average value of the warp tension value T in the detection unit period Tu, the warp tension value T at the rotation angle θ of the main shaft 44 may be displayed. For example, the detection unit period Tu may be one cycle period Ts, and the warp tension value T at a predetermined rotation angle θ in the detection unit period Tu may be displayed. Alternatively, the detection unit period Tu may be a plurality of cycle periods Ts, and the warp tension value T at a predetermined rotation angle θ in the detection unit period Tu may be displayed.

  The monitoring period Tm may be a plurality of detection unit periods Tu, and the representative value may be displayed on the display unit 54 as an average value of the warp tension value T at a predetermined rotation angle θ. In this case, it is preferable that the predetermined rotation angle θ avoids the rotation angle of the main shaft in which the influence of opening movement or beating is likely to appear as the warp tension value T.

  [Second Embodiment]

  Although the warp sending control pattern of the above embodiment has been described as always the same during the operation of the loom, this embodiment shows an example in which the sending control pattern is changed during the operation of the loom. That is, when changing the delivery control pattern in the order of arbitrary speed control, suppression control, and normal control immediately after startup, for example, a history of representative values about warps before and after changing from each delivery control pattern to another delivery control pattern The example which memorize | stores is demonstrated.

  In this embodiment, there are three transmission control patterns of arbitrary speed control, suppression control, and normal control.

  Arbitrary speed control is control for rotating the output shaft of the feeding motor regardless of the detected change in warp tension value. A speed pattern of the warp sending speed is set in the setting device 52.

  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 controls the feed motor based on the set speed pattern.

  The suppression control 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.

  Further, the calculator 50 calculates a deviation between the calculated average warp tension value and the steady operation 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 rotational speed of the output shaft of the delivery motor 32 is suppressed compared to that during normal control (suppression calculation step).

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

  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, immediately after the loom 10 starts to start, the loom 10 starts arbitrary speed control, and at the same time, the warp tension controller 58 has an average warp tension T of the warp tension value T for each pick. A value is calculated (representative value calculation step). The calculated warp tension average value is stored in the storage device 54 as needed (representative value storage step).

  The loom first weaves with arbitrary speed control. The arbitrary speed control performs weaving based on a preset speed pattern.

  The loom ends the arbitrary speed control, and then performs weaving with suppression control (warp state changing step). The 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 steady operation target warp tension value reaches a predetermined range, or in a predetermined continuous detection unit period Tu. It is assumed that the difference between the value and the steady operation 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.

  Next, the loom control device performs weaving by changing the delivery control pattern from suppression control to normal control (warp state changing step).

  When the weaving stage occurs at the time when the transmission control pattern as described above is changed, the operator determines the monitoring period Tm including the time of change from the arbitrary speed control to the suppression control or the time of change from the suppression control to the normal control. The representative value of the monitoring period Tm that is included, that is, the warp average tension value is displayed on the display unit 56. Thereby, the operator can grasp | ascertain easily the warp average tension value of the displayed monitoring period Tm.

  More specifically, the display controller 55 includes an arbitrary suppression change time 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 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 displays the read average warp tension value on the display 56 (representative value display step).

  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.

  Further, the display controller 55 may cause the display 56 to 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, not by the feeding control by the feeding device. 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.

  [Modification 1 of the second embodiment]

  In the second embodiment, 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.

  Specifically, the control pattern performed after startup may be normal control only, suppression control and normal control, arbitrary speed control and normal control.

  In order to suppress the occurrence of the weaving step, the warp feeding control is generally performed in the order of the control pattern of the suppression control and the normal control. However, if a weaving step occurs even with such control, warp feed control is performed in the order of control patterns of arbitrary speed control, suppression control, and normal control.

  [Modification 2 of the second embodiment]

  In the second embodiment, the delivery control based on the warp tension value has been described. However, the second embodiment can be modified as follows. For example, the steady speed of the warp may be arbitrarily controlled by only the winding device.

  Further, the winding motor and the delivery motor may perform control (weft density control) to change their basic speed so that the weft density is changed according to a preset tissue pattern.

  During the operation of the loom, loom rotation speed control is performed to change the target value of the steady rotation speed of the main shaft according to changes in the weaving conditions, that is, the texture pattern of the woven fabric to be woven. When these controls are performed, the average warp tension value in the monitoring period Tm including before and after the steady speed that is the speed of the warp is changed as described above may be displayed on the display.

  [Modification 3 of the second embodiment]

  When the fabric structure is actively changed, a specific structure pattern such as a warp opening pattern is set in the setting device, and each average warp of warp tension values T in a plurality of detection unit periods Tu corresponding to the set structure pattern is set. A tension value may be calculated.

  For example, the tissue pattern “AAABB” corresponding to each detection unit period Tu is previously stored in the storage device 54 by the setting device 52, and the average warp tension value T of only the B tissue pattern is stored in the storage device 54. In this case, only the tissue pattern “BB”, that is, the average warp tension value in the detection unit period Tu of the fourth, fifth, ninth, tenth,... Can be displayed on the display.

  [Third embodiment]

  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 drawing, the average warp tension value of each detection unit period Tu before and after the change from the suppression control (insensitive control) stored in the storage unit 54 to the normal control is displayed on the display unit 56 as a representative value history. indicate.

  Specifically, in the left half of FIG. 8, the average warp tension value detected in each detection unit period Tu in the suppression control 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 change 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 changing from “insensitive control” (suppression control) to “normal control”. Thus, the operator can 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.

  Further, since the operator can grasp the amount of decrease in the average warp tension value with respect to the steady operation target warp tension value, it is possible to determine the amount of decrease to decrease 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.

  [Fourth embodiment]

  In the normal operation of the loom 10, the warp control device of the present embodiment sends warp yarns so that the warp tension value approaches the normal operation target warp tension value based on the detected warp tension value and the normal operation target warp tension value. The apparatus is controlled (warp tension control step). The warp control device detects a stable state indicating that the difference between the warp tension value and the steady operation target warp tension value is within a predetermined range (stable state detection step).

  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 loom is started. (Starting fluctuation period display step).

  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 (warp tension control step). Thereby, the output shaft of the delivery motor is controlled so as to eliminate the deviation between the steady operation 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 figure, the steady operation target warp tension value is set to 200 kg. In addition, the average warp tension value is lower than the steady operation 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 immediately increases after the start of the loom, and once exceeds the steady operation target warp tension value. In this embodiment, the activation fluctuation period is the 10th pick, that is, the 10th cycle period Ts.

  Thereafter, the average warp tension value decreases and changes to a value close to the steady operation target warp tension value. Thereafter, when the average warp tension value is stabilized at the steady operation target warp tension value, the operating state of the loom is shifted to the steady state.

  Referring to the graph showing the change in the rotational speed of the delivery motor in FIG. 9B, immediately after starting the loom, it temporarily increases to the steady rotational speed until the deviation is calculated.

  The deviation is calculated from, for example, the representative value calculated from the first detection unit period Tu and the representative value calculated from the second detection unit period Tu following the first detection unit period Tu. Since there is no detection period Tu immediately before the detection unit period Tu, the representative value calculated from the immediately preceding detection unit period Tu cannot be calculated.

  When the loom control device 40 obtains the representative value calculated from the second 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, so as to eliminate the deviation. Rotational speed increases, eliminating overestimation of deviation. The warp tension control unit 58 determines that the steady state, that is, the state where the warp tension is stable when the calculated deviation falls within the range of the preset allowable value (stable state detection step). In other words, when the average warp tension value changes at a value substantially close to the steady operation target warp tension value, the rotation speed of the output shaft of the feed motor becomes a steady rotation speed and becomes stable.

  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 steady operation target warp tension value, the rotational speed of the feed motor changes at a steady speed.

  On the other hand, when the average warp tension value is higher than the steady operation target warp tension value, the warp is loosened between the feed motor and the take-up motor by making the speed of the feed motor faster than the speed of 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 read from the graph that the weft density has gradually decreased and reached the position where the average warp tension value is stabilized at the steady operation target warp tension value, and has returned to the steady weft density. .

  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, the period until the average warp tension value is stabilized at the steady operation target warp tension value can be displayed on the display 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.

  Although the length of the start variation period is indicated by the number of picks, the warp tension control unit 58 calculates the length dimension of the woven fabric during the start variation period using a preset weft density, and the calculated length dimension. May be displayed on the display device 56, or information on the length dimension of the woven fabric in the activation variation period, for example, the activation variation period may be displayed on the display device 56.

  [Fifth embodiment]

  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 steady operation 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. The period during which the average warp tension value in the suppression control reaches the steady operation target warp tension value is longer than the period during which the average warp tension value in the normal control reaches the steady operation 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, as the end condition, for example, when the average warp tension value reaches the steady operation target warp tension value, or when the average warp tension value becomes equal to the steady operation target warp tension value several times in succession, etc. It is.

  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 the weaving stage occurs, the operator displays on the display unit the period from the start of the loom in the suppression control until the steady operation target warp tension value is stabilized, that is, the period during which the suppression control is applied. Check the number of picks corresponding to. 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.

  [Modification of the fifth embodiment]

  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.

  [Sixth embodiment]

  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. Arbitrary speed control is control in which the output shaft of the feed motor 32 is rotated in a designated speed pattern regardless of the detected warp tension value by designating a 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.

  Even if the above arbitrary speed control is performed, the average warp before and after the change from the arbitrary speed control to the normal control is performed when the period from when the loom starts up until the steady operation target warp tension value is reached is long. When the tension value is lower than the steady operation target warp tension value, the rotational speed of the output shaft of the winding motor 46 is further made faster than the rotational speed of the output shaft of the delivery 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 steady. The period until the operation target 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.

  Each numerical value shown in the above embodiment is merely an example for explaining the embodiment, and may be different from that during actual weaving.

[Seventh embodiment]

  Separately from the first to sixth embodiments, the average warp tension value in any period during the operation of the loom may be stored in the storage device 54 and displayed as a history on the display device 56.

  For example, the average warp tension value during the operation of the loom may be stored in the storage device 54 at any time. In this case, the past average warp tension values corresponding to the number of preset detection unit periods Tu including the latest average warp tension value in consideration of the capacity of the memory 54 are stored, and the past average warp tension values are stored. May be discarded at any time.

  Further, when the operator presses a specific touch button while the loom is in operation, the average warp tension value before a predetermined number including the time point may be stored in the storage device 54 at the time of pressing. .

  In general, a huge storage capacity is required to store all the average warp tension values during operation of the loom. However, for example, when a weaving stage occurs during the operation of the loom, the operator can store a predetermined number of average warp tension values from the time when the weaving stage occurs by pressing the touch button.

  The memory 54 used when a specific touch button is pressed may be different from the memory 54 used during normal operation. However, the average warp tension value to be stored when a specific touch button is pressed may be stored in the storage unit 54 used during normal operation. These memories 54 continue to store the contents in the memories unless the contents are updated.

  When the operation signal indicating the operation stop is input to the loom control device 40, an average warp tension value before a predetermined number including the timing when the operation signal indicating the operation stop is input may be stored.

  As described above, when a weaving stage, in particular, a machine stage, occurs during operation of the loom, the operator stores the average warp tension value over a period in which the weaving stage can be confirmed at least in the woven fabric in the storage unit 54. It is possible to determine whether the cause of the weaving step is due to the machine or the yarn (so-called yarn factor, tension factor) by checking the magnitude of the change of the average warp tension value or the presence or absence of the change. .

  Here, unlike the stop stage, the machine stage is a weaving stage generated during operation of the loom. The cause of the mechanical stage is due to changes in the warp tension during the operation of the loom due to uneven winding tension of multiple warps wound around the delivery beam (yarn factor), warp sending device, winding device, etc. May be due to mechanical factors such as a weaving stage due to poor maintenance or a resonance stage due to vibration of the loom itself.

  In each of the above-described embodiments, the warp tension monitoring period and the warp tension of the warp tension are monitored by using the warp tension detection period and the detected warp tension value for calculating the deviation in the feed control (feedback control). This is an example using representative values. However, different values, different calculation methods, and different detection methods may be used for the warp tension detection period and the warp tension monitoring period, and the detected warp tension value and the representative value of the warp tension.

  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 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 grab for demonstrating the representative value of the warp tension of the monitoring method which concerns on this invention. It is a grab for demonstrating the representative value of the warp tension of another monitoring method concerning the present invention. It is a grab for demonstrating the representative value of the warp tension of another monitoring method concerning the present invention. It is a grab for demonstrating the representative value of the warp tension of another monitoring method concerning the present invention. It is a grab for demonstrating the representative value of the warp tension of another monitoring method concerning the present invention. It is the figure which displayed the log | history of the average warp tension value which is the representative value of the warp tension of another monitoring method concerning this invention. 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.

Explanation of symbols

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 ２２ 22 Weaving 24 Weft 26 Weaving cloth 28 Turning roll 30 Cloth winding beam 32 Delivery 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 yarn tension control unit 60 Operation button

Claims (7)

A warp tension monitoring method for detecting warp tension and monitoring the detected warp tension,
A tension detection step of detecting the warp tension as a warp tension value;
A representative value calculating step of calculating a representative value of the warp tension value detected in a detection unit period including a cycle period in which the main shaft makes one rotation;
A representative value storing step for storing the representative value during a monitoring period from immediately after the loom is started to an end point of a period including at least one of the detection unit periods;
And a representative value display step of displaying the representative value stored in the representative value storage step. A warp tension monitoring method for detecting warp tension and monitoring the detected warp tension,
A warp state changing step of changing a set value of the warp speed in the warp control pattern or the steady operation of the loom;
A tension detection step of detecting the warp tension as a warp tension value;
A representative value calculating step of calculating a representative value of the warp tension value detected in a detection unit period including a cycle period in which the main shaft makes one rotation;
A representative value storing step for storing the representative value during a monitoring period including the detection unit period before and after the warp state changing step is performed;
And a representative value display step of displaying the representative value stored in the representative value storage step.   The monitoring method according to claim 1, wherein the representative value includes an average value of the plurality of warp tension values detected during the detection unit period. And a speed detection step of detecting a delivery speed or a winding speed when the warp tension value is detected,
The monitoring method according to any one of claims 1 to 3, wherein the display step further displays the detected feeding speed or winding speed and the representative value of the warp tension value in association with each other. A warp tension monitoring method for detecting warp tension and monitoring the detected warp tension,
A tension detection step of detecting the warp tension as a warp tension value;
Based on the detected warp tension value and the steady operation target warp tension value in the steady operation of the loom, the warp tension control step of controlling the warp feeding device to bring the warp tension value closer to the steady operation target warp tension value When,
A stable state detecting step for detecting that the warp tension value has reached a stable state;
A warp tension monitoring method comprising: a start-up variation period from start-up of the loom to detection of the stable state or a start-up variation period display step of displaying information related to a length dimension of the woven fabric in the start-up variation period. Further, based on the steady operation target warp tension value and the warp tension value in the stable state, a correction amount for correcting the warp delivery amount so that the warp tension value approaches the steady operation target warp tension value. A correction amount calculation step to be calculated;
A warp feed amount control step of controlling the warp feed amount based on the correction amount;
Based on the steady operation target warp tension value and the warp tension value during the start-up variation period, suppression for calculating a correction amount of the warp delivery amount so that the warp tension value approaches the steady operation warp tension value A suppression calculation step for calculating a correction amount which is a calculation step and is suppressed from the correction amount calculated by the correction amount calculation step;
An activation variation period calculation step for calculating an activation variation period from the start of the loom to the time when the stable state is detected;
The monitoring method according to claim 5, further comprising a startup fluctuation period display step of displaying information related to the startup fluctuation period or a length dimension of a woven fabric in the startup fluctuation period.   The monitoring method according to claim 5 or 6, wherein the activation variation period includes any of the number of picks, time, and a fabric length dimension.

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