JP2006057227A - Method for regulating warp yarn tension of loom and device for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a weft bar generated directly after the starting of a loom. <P>SOLUTION: This method for regulating the warp yarn tension is provided by returning the warp yarn tension value changed during the stopped period of the loom to the tension value during its operating period. The method for regulating the warp yarn tension comprises processes of detecting the warp yarn tension during a starting preparation period from the generation of an operation command of the loom to the starting of the loom, regulating any one of actions of warp yarn-delivering and warp yarn-winding so as to approach the detected tension value to a previously set returning objective warp yarn tension value which is the warp yarn tension value to which the warp yarn tension should be returned until the initiation of the starting, also detecting the warp yarn tension during the operating period, regulating the delivery speed of the warp yarn so as to approach the detected warp yarn tension value to the previously set normal operation objective warp yarn tension value and correcting the returning objective warp yarn tension value based on the warp yarn tension value in a prescribed period directly after the initiation of the starting. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a warp tension control method and apparatus for a loom.

  The warp feeding device controls the warp sending amount so as to keep the warp tension within a certain range immediately after the start of operation of the loom until the operation stop.

  However, the warp tension during the operation stop period from the operation stop of the loom to the next operation start decreases as the operation stop state elapses.

  Therefore, a method is known in which a start-up preparation period is provided before start-up, the lowered warp tension is restored during the start-up preparation period, and weaving is performed during the operation period following the start-up preparation period (see Patent Document 1). ).

  Specifically, during operation of the loom, the warp sending device detects the rotation angle of the main shaft and the tension value of the warp, and stores the detected rotation angle of the main shaft and the tension value of the warp in the storage unit of the warp sending device. Remember.

  The loom control device stops the operation of the loom when a weft insertion failure or the like occurs.

  The loom control device rotates the main shaft at a predetermined rotation angle after removing the weft insertion defect of the weft.

  The warp sending device reads the actual warp tension value during the loom operation corresponding to the spindle rotation angle at which the weaving operation is started from the memory before the stopped loom starts the weaving operation again, and the read tension Based on the value, a tension return operation is performed to feed or wind the warp wound on the delivery beam of the warp delivery device.

  However, as shown in FIG. 7, during the weaving operation of the loom, in other words, the tension value of the warp in the moving state is different from the tension value of the warp during the slow operation, in other words, in the inching state or when stopped. In addition, FIG. 7 is obtained by separately measuring the change in warp tension value during steady operation and slow operation.

  Specifically, during the steady operation, the wrinkle of the opening device moves the warp in the vertical direction at a high speed, so the burden on the warp is large, and the detected tension value of the warp is the value during the slow operation. Greater than warp tension.

  However, during slow operation, in other words, since the vertical movement of the heel during inching or stopping is gentle, the burden that the heel exerts on the warp is small. For this reason, the warp tension value during the weaving operation when the rotation angles of the main shafts are the same is larger than the warp tension value during the slow operation, in other words, during the stop.

  As a result, the tension return operation from the stopped state is performed based on the tension value of the warp during steady operation, so that the tension return is not performed accurately. If an accurate tension return operation is not performed, the tension immediately after startup is not stable, and a weaving step is likely to occur.

Japanese Patent Publication No. 8-16299

  An object of the present invention is to prevent a weaving step that occurs immediately after the loom starts up.

  The loom warp tension control method according to the present invention restores the warp tension value changed during the loom stop period to the warp tension value during the loom operation period. The loom warp tension control method detects the warp tension during the start-up preparation period from the generation of the loom operation command to the start of start of the loom, and returns the detected tension value to the preset start time. Controlling the operation of at least one of the warp sending and the warp winding so as to approach the return target warp tension value that is the tension value of the warp to be detected, detecting the tension value of the warp during the operation period, Based on the warp tension value in a predetermined period immediately after the start of the start, the return target warp tension value is controlled so that the detected tension value approaches the preset steady operation target warp tension value. Including modifying.

  The warp tension control device according to the present invention is provided from the generation of a loom operation command to the start of start of the loom so as to return the warp tension value changed during the loom stop period to the warp tension value during the loom operation period. During the start-up preparation period, at least the warp sending and the warp winding are performed so that the detected tension value approaches a return target warp tension value which is a preset warp tension value to be returned before the start of the start. One of the operations is controlled, the warp tension value is detected during the operation period, and the warp sending speed is adjusted so that the detected warp tension value approaches the preset steady operation target warp tension value. Control. The warp tension controller includes a setter that sets the steady operation target warp tension value and the return target warp tension value, a storage that stores information based on the warp tension value or the warp tension value, and And a display for displaying information based on the warp tension value or the warp tension value.

  Another warp tension control device according to the present invention starts a loom from generation of a loom operation command so as to restore the warp tension value changed during the loom stop period to the warp tension value during the loom operation period. During the preparation period for starting up to the start, the detected tension value is set close to the return target warp tension value, which is the warp tension value to be returned before the start of the start. The warp tension value is detected during the operation period, and the warp tension value is detected so that the detected warp tension value approaches the preset steady operation target warp tension value. Control the speed. The warp tension control device sets the steady operation target warp tension value and the new return target warp tension value, and stores the steady operation target warp tension value and the new return target warp tension value. And a calculator for calculating and setting the new return target warp tension value based on the warp tension value and the steady operation target warp tension value for a predetermined period immediately after the start of the steady operation. .

  According to the present invention, a warp tension control method and apparatus for a loom includes correcting a return target warp tension value based on a warp tension value in a predetermined period immediately after start-up. For this reason, in the start-up preparation period before the next weaving operation period, at least one of the warp feeding and the warp winding is performed so as to approach the corrected return target warp tension value. Since at least one of the amount and the winding amount is controlled, the weaving stage generated immediately after the start of the loom, that is, immediately after the start of the predetermined operation, due to the change in the warp tension (lowering the warp tension) and the change in the feeding speed accompanying the change in warp tension Stable operation can be performed immediately after startup. As a result, almost no weaving steps occur even immediately after the loom is started.

  Here, the predetermined period is a period in which one pick (a range in which the main shaft of the loom rotates once) is a minimum unit. .

  Whether the return target warp tension value of the tension return operation in the previous start-up preparation period was the optimum value by comparing the warp tension value in the specified period immediately after start in motion and the target warp tension value in steady operation Can be judged. Thereby, the return target warp tension value of the next tension return operation can be corrected manually or automatically.

  In addition, an optimum return target warp tension value that is close to the steady operation target warp tension value can be obtained immediately after the start of operation of the next loom.

  Therefore, by performing the tension return operation based on the return target warp tension value at the time of the next weaving, the weaving stage that occurs immediately after the start due to the change in the warp tension (lowering the warp tension) and the change in the sending speed accompanying the change in warp tension Stable operation can be performed immediately after startup.

  The warp tension control method may further include obtaining an average value of the warp tension values in a predetermined period immediately after the activation, and simultaneously displaying the average value and the steady operation target warp tension value. By doing so, the average value becomes a guideline of the actual warp tension value immediately after the start of the loom, so that the operator can grasp the difference between the average value and the steady operation target warp tension value. As a result, the return target warp tension value of the next loom can be determined based on the difference between the average value and the steady operation target warp tension value, so that the operator can easily adjust the return target warp tension value in a short time. It can be carried out.

  The warp tension control method may further include comparing the average value with the steady operation target warp tension value and displaying a magnitude relationship between the average value and the steady operation target warp tension value. By displaying the magnitude relationship between the average value and the steady operation target warp tension value, the operator can intuitively grasp the magnitude relationship between the actual warp tension immediately after the start of the loom and the steady operation target warp tension value. it can. Therefore, the return target warp tension can be adjusted efficiently.

  The return target warp tension value is corrected by automatically obtaining a new return target warp tension value based on the magnitude relationship between the average value and the steady operation target warp tension value. Can be based on. By doing so, the optimum return target warp tension value is automatically set every time the loom starts to operate, so that the number of workers such as adjustment of the return target warp tension can be reduced.

  [loom]

  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 weft-inserted are beaten on the front of the weave 22 by the reed 20 to form a woven cloth 26.

  The woven fabric 26 reaches the clothing roll 28 from the front 22. The woven fabric 26 that has reached the clothing roll 28 is fed to the fabric beam 32 by the clothing roll 28 and a pair of press rolls 30. The fed woven fabric 26 is wound around the cloth winding beam 32.

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

  The value of the tension acting on the warp 12 is detected by, for example, a main shaft rotation angle of 1 ° by a warp tension sensor 38 that detects a load acting on the back roller 16. The detected value of the warp tension is supplied to the warp sending device 40 as the 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 clothes winding roll 28 is rotated by a gear mechanism including a speed reduction mechanism such as a gear that receives the rotational motion of the winding motor 46. The rotated clothing roll 28 sends the woven cloth 26 to the cloth winding beam 32 in cooperation with the pair of press rolls 30.

  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 warp feeding device 40 as the main shaft rotation angle θ.

  [Warning device]

  FIG. 2 shows a block diagram of the loom 10. The warp sending device 40 includes a calculator 50 that calculates information based on the tension value of the warp 12 during a predetermined period immediately after the start of startup, and a setting unit 52 that sets a steady operation target warp tension value and a return target warp tension value. , A storage unit 54 for storing the information, and a display unit 56 for displaying the information. In the embodiment described later, the warp feeding device 40 functions as a warp tension control device.

  The warp sending device 40 controls the sending motor 34 of the warp 12 so that the warp tension value changed during the stop period of the loom 10 is returned to the warp tension value during the operation 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, an operation command signal S1 is output to the loom control device 62 and the warp delivery device 40.

  The warp tension control unit 58 of the warp sending device 40 includes a calculator 50. The calculator 50 calculates information based on the tension value of the warp 12 during a predetermined period immediately after the start of activation.

  The setting device 52 includes setting a steady operation target warp tension value and a return target warp tension value that is a tension value of the warp to be returned before starting.

  The steady operation target warp tension value and the return target warp tension value are set in advance by the start of operation of the loom, that is, by the generation of an operation command. Further, as will be described later, the return target warp tension value is a value that can be corrected even after the start of the return operation of the loom.

  The calculator 50 calculates information based on the tension value of the warp 12 during a predetermined period immediately after start-up described later.

  The storage device 54 stores information based on the tension value of the warp 12 during a predetermined period immediately after the start of activation.

  The display 56 displays information based on the tension of the warp 12.

  The delivery motor 34 rotates the output shaft of the delivery motor 34 based on the drive signal S2 from the warp tension control unit 58.

  Hereinafter, the operation of the warp feeding device 40 will be described.

  The warp sending device 40 is a preset warp tension to be returned by the start of the set warp 12 during the start preparation period from the generation of the operation command of the loom 10 to the start of the start of the loom. The delivery amount or the winding amount by the rotation operation of the delivery beam 14 around which the warp 12 is wound is controlled so as to approach the return target warp tension value which is a value.

  Further, the warp feeding device 40 detects the tension value of the warp 12 during the operation period, and the warp 12 feeding speed is set so that the detected tension value of the warp 12 approaches the preset steady operation target warp tension value. To control.

  [Suspension period]

  When the operator presses the operation button 60 while the loom 10 is operating, the loom 10 stops. Thereby, the operation period ends and the stop period starts.

  In the example of FIG. 3, since the operator has pressed the operation button 60, the rotation of the main shaft 44 stopped at the position where the rotation angle θ is about 50 °.

  In the stop period, since the warp yarn 12 from the delivery beam 14 to the clothing roll 28 is given tension, the warp yarn 12 to which tension has been given extends. For this reason, the tension value of the warp 12 from the delivery beam 14 to the clothing roll 28 becomes smaller as the stop period becomes longer.

  [Startup preparation period]

  When the operator presses the operation button 60, an operation command signal S1 is input to the loom control device 62 and the warp delivery device 40. Thereby, the loom 10 shifts from the stop period to the start preparation period.

  The warp feeding device 40 performs the following returning operation in order to set the warp tension value to the warp tension value necessary for starting the start-up during the start-up preparation period.

  The warp feeding device 40 detects the tension of the warp 12 by the warp tension sensor 38 during the start-up preparation period from the generation of the operation command of the loom 10 to the start of the start of the loom 10, and the detected tension value is set in advance by the setting device 52. The sending motor 34 is actuated so as to approach the return target warp tension value set to, and the warp 12 is fed or taken up to control the sending or winding amount of the warp 12. Similarly, the winding amount of the warp yarn 12 (woven fabric 26) or the winding amount may be controlled by operating the winding motor 46.

  In this way, either the feeding motor 34 or the winding motor 46 may be operated to control the sending amount or winding amount of the warp yarn 12, or the feeding motor 34 and the winding motor 46 may be operated simultaneously. May be. For example, the tension of the warp 12 can be changed also by rotating the feeding motor 34 and simultaneously rotating the winding motor 46 in the normal direction. In this case, a drive signal is directly output from the warp tension controller 58 to the winding motor 46.

  Here, the return target warp tension value is the tension value of the warp 12 that should be returned before starting.

  Thereafter, the loom control device 62 rotates the rotation angle θ of the main shaft 44 so as to be, for example, 180 °, which is a beating start angle.

  [Driving period]

  When the tension of the warp 12 reaches the return target warp tension value, the warp sending device 40 outputs a return operation completion signal indicating that the return operation has been completed to the loom control device 62.

  The loom control device 62 that has received the return operation completion signal operates the spindle motor 42, the delivery motor 34, and the take-up motor 46, and starts operation by weft insertion and hammering. Thus, the loom 10 shifts from the start preparation period to the operation period.

  As shown in FIG. 3, when the loom 10 shifts to a predetermined period immediately after the start of starting, the warp sending device 40 uses the average value of the warp tension value detected by the warp tension sensor for each pick as the warp tension average value. The data is stored in the storage device 54 as needed.

  In the illustrated example, the warp tension controller 58 sets the start of the predetermined period when one pick period has elapsed since the start preparation period has elapsed. Therefore, the predetermined period is a five-pick period from the second pick to the sixth pick from the elapse of the startup preparation period.

  The warp tension control unit 58 further obtains an average value of the warp tension of the five warp tension average values in a predetermined period, that is, the above-mentioned five pick periods, and stores it in the storage unit 54. Therefore, the predetermined period is a period for which an average value with the pick period as a unit period is calculated.

  When the loom 10 has passed the predetermined period, the warp tension control unit 58 displays the average warp tension value and the steady operation target warp tension value on the display 56. It is preferable that the screen of the display device 56 is configured by a touch panel.

  By displaying the warp tension average value and the steady operation target warp tension value on the screen of the display unit 56, the operator visually checks the difference between the steady operation target warp tension value and the warp tension average value on the screen of the display unit 56. It can be grasped by.

  When the operator determines that the average warp tension value is smaller than the steady operation target warp tension value, the operator depresses a predetermined button displayed on the screen of the display 56 to return to the next start-up preparation period. The return target warp tension value applied to the operation can be corrected to a large value.

  Further, when the operator determines that the average warp tension value is larger than the steady operation target warp tension value, the operator presses a predetermined button displayed on the screen of the display device 56, so that the next start preparation period The return target warp tension value to be applied to the return operation can be corrected to a small value.

  When the rotational speed of the output shaft of the feed motor 34 is large and the rotational speed does not reach the set rotational speed, and when the rotational speed of the main shaft 44 does not reach the steady rotational speed, the warp 12 is detected. The tension value may not be an accurate warp tension value. In such a case, the warp tension detection value between several picks immediately after activation is not used in the calculation of the warp tension average value. In this embodiment, the warp tension detection value of the first pick is not used for the calculation of the average warp tension value.

  The storage device 54 stores the warp tension average value at least until the start of the next start, specifically until the calculation for a predetermined period at the next start is completed.

  In this way, by simultaneously displaying the warp tension average value and the steady operation target warp tension value on the display 56, the operator presses a predetermined button displayed on the screen of the display 56 of the loom 10. Thus, the return target warp tension value set in the setting device 52 can be easily corrected.

  For this reason, in the start-up preparation period before the next weaving steady operation period, at least one of the warp sending amount and the winding amount is controlled so as to approach the corrected return target warp tension value. It is possible to suppress a weaving step that occurs immediately after the start of the loom due to a change in tension (a decrease in warp tension) and a change in delivery speed accompanying a change in warp tension, and a stable operation can be performed immediately after the start. As a result, almost no weaving steps occur even immediately after the loom is started.

  [Modification 1]

  The warp feeding device 40 described above can be configured as follows.

  The minimum unit of the predetermined period for detecting the tension value of the warp 12 by the warp tension sensor 38 may be for each of a plurality of picks instead of for each pick. For the plurality of picks, for example, a weaving pattern or an opening pattern composed of a plurality of picks may be defined as one cycle (period).

  In the illustrated example, the calculator 50 calculates the average value of the warp tension based on all the warp tension values detected during the detection period, but the calculator 50 is based on part of the warp tension value detected during the detection period. Thus, the average value of warp tension may be calculated.

  Specifically, the warp tension average value may be calculated based on continuously detected warp tension values from the first pick to several picks in the detection period, or a plurality of warp tensions detected in the detection period may be calculated. One or every other plurality of tension values may be selected, and the warp tension average value may be calculated based on the selected plurality of tension values.

  The display 56 may display on the screen so that the average values of the warp tensions in the second to sixth picks, that is, the respective warp tensions can be compared instead of the average value of the warp tension in the detection period or together with the average value of the warp tension. .

  [Modification 2]

  The memory 54 stores the number of picks after the start until the average warp tension value reaches the steady operation target warp tension value, or until the average warp tension value reaches a steady state at the steady operation target warp tension value. For example, the number of picks until the average value of the warp tension reaches the steady operation target warp tension value for a predetermined number of consecutive picks is stored.

  The operator can determine whether or not to perform the return operation in the next startup preparation period according to the stored number of picks by displaying the stored number of picks on the display 56.

  Specifically, when the number of picks is large, it means that it takes time until the average warp tension value reaches the steady operation target warp tension value, and it is estimated that the drop in warp tension before activation is large.

  Further, the warp tension controller 58 may automatically determine whether or not to perform a return operation at the next weaving according to the number of picks (period).

  In this case, the warp tension control unit 58 determines that the average value of the warp tension has reached substantially the same state as the steady operation target warp tension during the loom operation. And the memory | storage device 54 memorize | stores the number of picks when reaching substantially the same state after starting.

  When the warp tension controller 58 automatically determines whether or not to perform a return operation, for example, a threshold value for each stop time is set in advance, and if the number of picks is greater than the threshold value, the warp tension control unit 58 depends on the stop time. The return operation can be performed.

  [Modification 3]

  The operator may be able to manually change the return target warp tension value for the next return operation according to the number of pick periods stored in the second modification.

  For example, when the number of picks exceeds a predetermined number of picks, the return target warp tension value can be manually increased by a predetermined percentage. Further, when the warp tension controller 58 performs the next return operation, the return target warp tension value may be automatically changed according to the number of picks.

  FIG. 4 shows whether the return target warp tension value in the return operation is set and whether the difference between the average warp tension value and the steady operation target warp tension value is within the set allowable range. If there is, a setting display screen for displaying the magnitude relation based on the warp tension value is shown.

  When the operator presses the increase button B1 and the decrease button B2, the return target warp tension value is changed to a value in the range of 96% to 102% of the steady operation target warp tension value. When the operator presses the increase button B1 and the decrease button B2 once, the return target warp tension value is changed in increments of 1%. Further, when the operator changes to the OFF button of the display 56, the warp feeding device 40 does not perform the return operation.

  The return target warp tension value can be finely adjusted by changing the setting of the percentage of the steady operation target warp tension value. Further, when the steady operation target warp tension value is changed, the return target warp tension value is also changed.

  After setting the return target warp tension value, when the operation command signal S1 is input to the loom control device 62 and the warp sending device 40, the return operation is performed, and when the warp tension reaches the return target warp tension value, the loom 10 is in a steady state. Transition to the operation period.

  When the weaving machine 10 weaves up to the first six picks after startup, the warp tension control unit 58 compares the steady operation target warp tension value with the warp tension average value, and the warp tension average value is greater than the steady operation target warp tension value. When the weight exceeds 1 kg, a right-pointing triangle mark is displayed at the determination point A to inform the operator that the actual warp tension during the current weaving is larger than the steady operation target warp tension value.

  The worker who sees this lowers the return target warp tension value in order to lower the warp tension at the next weaving.

  Further, when the steady operation target warp tension value exceeds 1 kg from the average warp tension value, a left-pointing triangle mark is displayed at the determination point A. Furthermore, when the difference between the average value of the warp tension and the target warp tension value for steady operation is less than 1 kg, “◯” is displayed at the determination point A. When the display of the judgment location A is “◯”, it means that the warp tension is optimum.

  Table 1 shows an example of a steady operation target warp tension value, a warp tension average value, and a determination display process in the warp tension adjustment. Table 1 shows an example in which the percentage of the steady operation target warp tension value is directly input as shown in FIG.

表１において、定常運転目標経糸張力値が２００ｋｇ、１回目の運転開始時の復帰目標経糸張力値が２００ｋｇ（定常運転目標経糸張力値の１００％）とする。

In Table 1, the steady operation target warp tension value is 200 kg, and the return target warp tension value at the start of the first operation is 200 kg (100% of the steady operation target warp tension value).

  First, as a result of the operator starting the first operation, when the steady operation target warp tension value is 200 kg and the average warp tension value is 190 kg, the difference is −10 kg. Therefore, since the average warp tension value is less than the steady operation target warp tension value, a left-pointing triangle mark is displayed at the determination point A.

  The operator grasps that warp tension is further necessary by looking at the determination displayed by the left triangle mark, and sets the return target warp tension value to 210 kg (105%) so that the warp tension is increased. .

  Next, as a result of the operator starting the second operation, the difference between the steady operation target warp tension value and the average warp tension value was -5 kg. As a result, a left-pointing triangle mark is displayed at the determination location A. The operator sets the return target warp tension value to 220 kg (110%) so that the warp tension is further increased.

  Next, as a result of the operator starting the third operation, the difference between the steady operation target warp tension value and the average warp tension value was +5 kg. As a result, a right-pointing triangle mark is displayed at the determination location A. This time, the operator sets the return target warp tension value to 216 kg (108%) so that the warp tension becomes small.

  As a result of the operator starting the fourth operation, the difference between the steady operation target warp tension value and the average warp tension value was −1 kg. As a result, “◯” is displayed at the determination location. Thereby, the optimum warp tension is obtained and the adjustment of the warp tension is completed.

  By displaying the magnitude relationship between the warp tension value and the steady operation target tension value in this manner, the operator can easily correct the return target warp tension value.

  [Modification]

  Although the percentage can be changed by pressing the buttons B1 and B2 as shown in FIG. 4, the percentage may be directly input as a numerical value as shown in FIG. Alternatively, instead of inputting the percentage, the return target warp tension value may be directly input as a numerical value. Alternatively, the return target warp tension value may be set for each length of the stop period or for each rotation angle θ of the main shaft at the start.

  As shown in Table 1, the warp feeding device 40 may feed back the magnitude relationship in the previous return operation to the next return operation. Further, an optimum return target warp tension value in the next return operation may be automatically obtained and set. In this case, the computing unit 50 calculates the return target warp tension value in the next return operation based on the steady operation target warp tension value and the average warp tension value in the previous return operation.

  Further, the value for changing the return target warp tension value may be changed according to the difference between the average value of the warp tension and the target warp tension value for steady operation. For example, when the difference between the average warp tension value and the steady operation target warp tension value is small, the value for changing the return target warp tension value may be reduced.

  In this embodiment, the storage unit 54 stores the warp tension average value at least until the next start-up. Specifically, the storage device 54 stores the warp tension control unit 58 until the calculation of the return target warp tension value is completed.

  In the above embodiment, the set value of the steady operation target warp tension value and the average value of the warp tension value in a predetermined period immediately after the start are used, but based on the detected value at the rotation angle of the main shaft instead of the average value. Thus, the return target warp tension value may be obtained. Specific examples thereof will be described below.

  FIG. 6 is a graph in which the detected value of the steady operation warp tension value in the same phase with respect to the rotation angle θ of the main spindle and the warp tension value in a predetermined period immediately after the start are superimposed.

  In the illustrated example, the warp tension value immediately after the warp immediately after startup is smaller than the steady operation target warp tension value.

  Normally, the warp tension value is detected by the warp tension sensor 38 every time the main shaft rotates 1 °. However, FIG. 6 is plotted every time the main shaft rotates 30 °.

  The storage device 54 stores the detected value of the steady operation warp tension value. The detected value of the steady operation warp tension value is a fluctuation value of the detected value of the warp tension value when the warp tension is stable during the operation period with respect to the rotation angle of the main shaft 44.

  For example, the computing unit 50 calculates a steady operation warp tension value when the rotation angle of the main shaft is 120 ° and a warp tension value during a predetermined period immediately after the start in a predetermined pick or a plurality of picks immediately after the start of the loom. Compare However, the warp tension value immediately after startup may be displayed as the steady operation warp tension value, and the operator may compare them. In this case, since the computing unit 50 does not calculate and compare the average value, the computing unit 50 is omitted.

  As a result of the comparison, when the difference exceeds a predetermined allowable value (positive allowable value or negative allowable value), the return target warp tension value in the next return operation is set to a predetermined value so as to eliminate the difference. Increase or decrease by a percentage. Alternatively, as in the second embodiment, the magnitude relationship between the steady operation target warp tension value and the warp tension value immediately after startup may be displayed.

  Further, for example, according to the average difference between the detected value of the steady operation warp tension value at the rotation angle θ of the main spindle between the predetermined picks and the warp tension value in the predetermined period immediately after the start, the average value of the difference The return target warp tension value in the next return operation may be obtained so that. In this case, the rotation angle θ of the main shaft may be a continuous period or an intermittent period.

  The information based on the warp includes the average value of the warp tension, the detected value, and the magnitude relationship between the average value of the warp tension and the steady operation target warp tension value. As in each of the embodiments described above, an arithmetic unit 50 is required to calculate and compare the average value and the magnitude relationship.

It is a schematic diagram which shows one Example of the warp sending apparatus which concerns on this invention. FIG. 2 is a block diagram of the warp feeding device shown in FIG. 1. 2 is a time-series graph showing a change in warp tension value for explaining the operation of the warp feeding device shown in FIG. 1. It is a schematic diagram which shows one Example of the display part of another warp sending apparatus which concerns on this invention. It is a schematic diagram which shows one Example of the display part of another warp sending apparatus which concerns on this invention. It is a time series graph explaining operation | movement of another warp sending apparatus which concerns on this invention. It is a time series graph which showed the change of the warp tension value of the same phase at the time of steady operation, inching and stopping.

Explanation of symbols

S1 Operation command signal S2 Drive signal 10 Loom 12 Warp 14 Sending beam 16 Back roller 18 Reed frame 20 Reed 22 Pre-weaving 24 Weft 26 Weaving fabric 28 Clothing roll 30 Press roll 32 Fabric winding beam 34 Delivery motor 36 Gear mechanism 38 Warp tension sensor 40 Warp yarn feeding device 42 Spindle motor 44 Spindle 46 Winding motor 48 Encoder 50 Calculator 52 Setting device 54 Storage device 56 Display device 58 Warp tension control unit 60 Operation button 62 Loom control device

Claims (6)

In the warp tension control method for a loom that returns the warp tension value changed during the loom stop period to the warp tension value during the loom operation period,
During the start-up preparation period from the generation of the loom operation command to the start of the loom start, the warp tension is detected, and the detected tension value is set in advance as the warp tension value to be returned by the start of the start. Controlling at least one of warp sending and warp winding so as to approach a certain return target warp tension value;
During the operation period, the warp tension value is detected, and the warp sending speed is controlled so that the detected tension value approaches the preset steady operation target warp tension value,
A warp tension control method for a loom, comprising correcting the return target warp tension value based on a warp tension value in a predetermined period immediately after the start of the start. Further, obtaining an average value of warp tension values in a predetermined period immediately after the start of the start,
The warp tension control method for a loom according to claim 1, comprising simultaneously displaying the average value and the steady operation target warp tension value. Further, obtaining an average value of warp tension values in a predetermined period immediately after the start of the start,
The warp tension control method for a loom according to claim 1, comprising comparing the average value with the steady operation target warp tension value and displaying a magnitude relationship between the average value and the steady operation target warp tension value. .   A new return target warp tension value is automatically obtained based on the magnitude relationship between the average value and the steady operation target warp tension value, and the return target warp tension value is calculated based on the obtained new return target warp tension value. The warp tension control method for a loom according to any one of claims 1 to 3, wherein correction is performed. The tension detected during the start-up preparation period from the generation of the loom operation command to the start of the loom start-up in order to restore the warp tension value changed during the loom stop period to the warp tension value during the loom operation period. Controlling the operation of at least one of warp sending and warp winding so that the value approaches a return target warp tension value, which is a preset warp tension value to be returned before the start of the start, A warp tension control device that detects a warp tension value during an operation period and controls a warp sending speed so as to bring the detected warp tension value closer to a preset steady operation target warp tension value,
A setter for setting the steady operation target warp tension value and the return target warp tension value; a storage unit for storing information based on the warp tension value or the warp tension value; and the warp tension value or the warp A warp tension control device for a loom, comprising: a display for displaying information based on a warp tension value. The tension detected during the start-up preparation period from the generation of the loom operation command to the start of the loom start-up in order to restore the warp tension value changed during the loom stop period to the warp tension value during the loom operation period. Controlling the operation of at least one of warp sending and warp winding so that the value approaches a return target warp tension value, which is a preset warp tension value to be returned before the start of the start, A warp tension control device that detects a warp tension value during an operation period and controls a warp sending speed so as to bring the detected warp tension value closer to a preset steady operation target warp tension value,
A setter for setting the steady operation target warp tension value and the new return target warp tension value, a storage device for storing the steady operation target warp tension value and the new return target warp tension value, and the activation A warp tension control device for a loom, comprising: a calculator for calculating and setting the new return target warp tension value based on the warp tension value and the steady operation target warp tension value for a predetermined period immediately after the start.

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