JP2008303484A - Method for regulating warp tension in loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem such as occurrence of weaving bar etc., by quickly making the warp tension of a loom at the start of operation correspond to that during operation. <P>SOLUTION: A warp tension return switch 27 is pressed to carry out one rotation of normal rotation inching. A controller 2 stores the rotation angle of the loom from the rotation start position S1 to the stop position S2 of the loom and the warp tension measured by a load cell 20 corresponding to the rotational speed of each loom. The controller 2 calculates the average warp tension A of the stored warp tension and a deviation A1 from a preset target warp tension X in operation and stores the deviation as a correction value. The correction value is added to the warp tension B of the stop position S2 of the loom having a preset rotation angle of the loom to calculate a return target warp tension C at the stop position S2 of the loom. Then a tension is added to the warp T by the reverse rotation of a warp delivery motor 3. When the warp tension is made coincident with the return target warp tension C, the preparation of the operation start of the loom is completed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a warp tension adjusting method for returning the warp tension to the tension necessary for the operation of the loom prior to the operation of the loom.

  In a loom, for example, when weaving a new fabric, a machine work is performed. The machine work includes an operation of replacing a warp beam, an operation of passing a new warp to the winding side of the woven fabric, and an operation of setting the weaving conditions of the new fabric. When each setting is performed, an operation for returning the warp tension to the preset target warp tension during operation is performed, and the operation of the loom is started. Further, even when the same fabric is being woven, if the loom is stopped for a long time, warp looseness due to warp elongation occurs, and therefore, the warp tension return adjustment work is performed prior to the operation of the loom. If these warp tension return operations are not performed correctly, a weaving step occurs every time the loom starts to operate, which not only lowers the quality of the fabric but also impairs the weaving itself if the weaving step occurs frequently. Therefore, various warp tension adjusting methods for returning the warp tension have been proposed. .

  For example, in the method disclosed in Patent Document 1, in order to prevent weaving steps, information preset in the target tension processor 76, that is, a correction coefficient or a correction value k is multiplied or added to the target value Tr during steady operation. Then, the target tension Ts of the warp at the time of starting preparation different from the target value Tr at the time of steady operation is determined and set in the target tension processor 76. The warp beam 14 is driven by the start preparation signal S4 input prior to the start of the operation of the loom, and the warp tension is returned to the warp target tension Ts at the start preparation.

In the method disclosed in Patent Document 2, in order to return the warp tension value changed during the loom stop period to the warp tension value during the loom operation period, the loom starts from the generation of the loom operation command. At least one of the warp feeding and the warp winding is operated so that the tension value of the warp detected during the start-up preparation period approaches the preset return warp tension value. Further, the return target warp tension value is corrected based on the warp tension value in a predetermined period immediately after the start of the loom, and set as the return target warp tension value at the time of the next tension return. This correction operation is carried out step by step until the return target warp tension value is the closest to the steady operation target warp tension value. The return target warp tension value is set as a percentage of the steady operation target warp tension value, and includes 100%, that is, the same value as the steady operation target warp tension value.
JP 2004-300610 A JP 2006-57227 A

  However, since the correction coefficient and the correction value k for determining the target tension Ts of the warp at the time of start-up preparation in Patent Document 1 need to be different values depending on the fabric to be woven, The correction value k is enormous, and when it is necessary to weave a new fabric that has not been prepared in advance, a correction coefficient or correction value k suitable for the fabric must be newly input and set. There is an inconvenience.

  Also in Patent Document 2, the percentage for determining the return target warp tension value seems to be the same value as the correction coefficient of Patent Document 1, so a large number of optimal percentages for every fabric must be prepared and set in advance. In addition, when it is necessary to weave a new fabric that is not prepared in advance, there is a disadvantage that a correction coefficient or a correction value k suitable for the fabric must be newly input and set. Furthermore, in the method in which the return target warp tension value is determined based on a predicted numerical value as a percentage, there is no guarantee that the determined value is the optimum value for the fabric that is actually woven. For this reason, in Patent Document 2, the warp tension measured in several revolutions immediately after the start of the loom is observed, and the return target warp tension value is corrected step by step until the state closest to the steady operation target warp tension value is reached. There is a problem that a troublesome correction operation must be performed. This problem also occurs in Patent Document 1 that uses an estimated value such as a correction coefficient or a correction value k.

  An object of the present invention is to make it possible to quickly correspond the warp tension at the start of operation of the loom to the warp tension at the time of operation, and to solve problems such as the occurrence of weaving steps.

  The invention of claim 1 is directed to a loom including a dedicated warp feeding motor that rotates a warp beam, a warp tension detecting device, and a control device in which a target warp tension during operation is set in advance. Prior to rotating the loom, the warp tension detecting device measures the rotating warp tension, calculates a correction value based on the measured warp tension and the target warp tension during operation, and uses the correction value in advance. A return target warp tension at a determined loom rotation angle is calculated and set in the control device, and at least the warp feeding motor is driven to make the warp tension coincide with the return target warp tension.

  According to the present invention described in claim 1, since the return target warp tension is set based on the warp tension measured under the actual weaving conditions, it corresponds to the warp tension during operation from the start of operation of the loom. Weaving can be started in the warp tension state, which can greatly contribute to prevention of weaving steps.

  The present invention of claim 2 is characterized in that, prior to the measurement of the warp tension, the temporary target warp tension is set in the control device, and the warp tension is matched with the temporary target warp tension. For example, even when the warp tension is hardly applied or is in a considerably low state, such as during machine setting, the return adjustment of the warp tension prior to the operation of the loom can be appropriately performed.

  According to a third aspect of the present invention, the correction value is a deviation between the average value of the measured warp tension and the target warp tension during operation, and the return target warp tension is determined at the predetermined loom rotation angle. Since the correction value is added to the measured warp tension, the return target warp tension corresponding to the warp tension during operation can be obtained with only a simple calculation formula.

  According to a fourth aspect of the present invention, the correction value is a deviation between the average value of the measured warp tension and the warp tension measured at the predetermined loom rotation angle, and the return target warp tension is Since the calculation is performed by adding the correction value to the target warp tension during operation, the return target warp tension corresponding to the warp tension during operation can be obtained using only a simple calculation formula.

  The invention according to claim 5 is characterized in that the predetermined loom rotation angle is a rotation start position or a stop position of the loom at the time of the warp tension measurement. In this case, the loom stop position for determining the return target warp tension can be recognized without particularly setting the loom rotation angle.

  The present invention according to claim 6 is characterized in that the loom is rotated once at the time of measuring the warp tension, so that it is possible to set an appropriate return target warp tension for the fabric to be woven with the least number of operations. .

  The invention of the present application can quickly match the warp tension at the start of operation of the loom to the warp tension at the time of operation by setting the return target warp tension based on the warp tension of the fabric to be actually woven. This can greatly contribute to solving problems such as occurrence.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a warp feeding mechanism, a woven fabric winding mechanism and a control mechanism of a loom for carrying out the present invention.

  The loom drive motor 1 receives the operation control of the control device 2. A warp feeding motor 3 capable of forward and reverse rotation independent of the loom driving motor 1 drives the warp beam 4 and feeds the warp T. The warp yarn T fed from the warp beam 4 is passed through the back roller 5 and the tension roller 6 to the reeds 7 and 8. A woven fabric W formed by beating a weft thread (not shown) inserted between the warp threads T passes through an expansion bar 9, a surface roller 10, a press roller 11, and a wrinkle removing guide member 12. It is wound around the cross roller 13. The surface roller 10 that pulls the woven cloth W toward the cross roller 13 in cooperation with the press roller 11 obtains a driving force from a dedicated woven cloth winding motor 14 that is independent of the loom driving motor 1 and can be rotated forward and backward. The cross roller 13 rotates in conjunction with the surface roller 10. The woven fabric winding motor 14 may be configured to drive the cross roller 13 and the surface roller 10 may be driven from the cross roller 13.

  The tension roller 6 is attached to one end of a tension lever 15, and tension is applied to the warp T by a tension spring 17 attached to the other end arm 16 of the tension lever 15. The tension lever 15 is rotatably supported by the other end arm 19 of the detection lever 18, and a load cell 20 is connected to one end of the detection lever 18. The warp tension is transmitted to the load cell 20 via the tension roller 6, the tension lever 15 and the detection lever 18, and the load cell 20 outputs an electric signal corresponding to the warp tension to the control device 2. Accordingly, the tension roller 6, the tension lever 15, the detection lever 18 and the load cell 20 constitute a warp tension detecting device of the present invention.

  The function panel 21 includes an input switch 22 for inputting a weaving condition including a weaving type and warp tension corresponding to each weaving, a loom start switch 23, a loom forward inching switch 24, a loom reverse inching switch 25, A stop switch 26, a warp tension return switch 27, a warp feed motor drive switch 28, and a woven fabric take-up motor drive switch 29 are disposed and electrically connected to the control device 2, respectively. Further, the control device 2 includes a rotary encoder 30 for detecting the rotational angle of the loom disposed in the drive system of the loom driving motor 1, and a rotary encoder for detecting the rotational angle of the motor disposed on the rotational shaft of the warp feeding motor 3. 31 and a rotary encoder 32 for detecting a motor rotation angle disposed on a rotation shaft of the woven fabric winding motor 14 are electrically connected to each other. In the embodiment of FIG. 1, it is described that the loom drive motor 1 and the warp feeding motor 3 are controlled by a single control device 2, but the woven fabric winding motor 14 and a warp opening device not shown are shown. It is possible to implement the present invention even in a control system that includes a dedicated control device including each of the control devices and connects each control device to the control device 2 having a function as a host.

  The control device 2 can output drive signals to the loom driving motor 1, the warp feeding motor 3 and the woven fabric winding motor 14 to operate the loom. The control device 2 includes a loom rotation angle detection signal output from the rotary encoder 30, a warp tension detection signal output from the load cell 20, a rotary encoder 31 of the warp feed motor 3, and a woven cloth winding during the operation of the loom. A motor rotation angle detection signal output from the rotary encoder 32 of the take-off motor 14 is input. Based on the detection signal of the load cell 20, the control device 2 outputs a drive signal to the warp sending motor 3 so that the warp tension matches the target warp tension during operation set in the control device 2 in advance.

  On the other hand, the control device 2 includes a calculation unit, a storage unit, an input / output interface, and the like (not shown). For example, when weaving a new fabric, a machine work is performed in which the old and new warp beams 4 are replaced and the warp yarns of the new warp beams 4 are passed to the woven fabric winding side. Further, the weaving conditions for the new fabric are input from an input screen opened by operating the input switch 22 of the function panel 21 and stored in the storage unit of the control device 2 via the input / output interface. The weaving conditions include the target warp tension during operation of the loom and are preset and stored in the control device 2.

  Next, a warp tension adjusting method performed prior to the start of operation of the loom will be described with reference to FIGS. The machine work is completed, and the operation target warp tension X (see FIG. 2) is preset in the control device 2, but the warp T is hardly tensioned or is in a considerably low tension state. Even if the loom is rotated in this state, the warp tension cannot be properly measured, and the warp T may be damaged. Therefore, as shown in the flowchart of FIG. 3, the operator operates the input switch 22 to set the temporary target warp tension. The temporary target warp tension is preferably set lower than the target warp tension X during operation. Next, when the operator depresses the warp feeding motor drive switch 28 on the function panel 21, the warp feeding motor 3 is independently driven in reverse rotation based on the program set in the control device 2, and the warp T 4 is warped. And tension is applied to the warp T. When the warp tension measured by the load cell 20 matches the temporary target warp tension, the warp feeding motor 3 is automatically stopped. This operation can also be performed by driving both the warp feeding motor 3 and the woven fabric winding motor 14. In order to operate such a program, it is preferable to provide a temporary target warp tension return switch separately in place of the warp feed motor drive switch 28 and the woven fabric take-up motor drive switch 29 for easy operation.

  Subsequently, as shown in the flowchart of FIG. 4, the operator presses the warp tension return switch 27 on the function panel 21. The loom automatically starts forward inching based on a program set in the control device 2. The rotation amount of forward inching is set to 1 rotation in the present embodiment. Therefore, when the loom rotation angle signal input from the rotary encoder 30 reaches one rotation, the control device 2 outputs a loom stop signal and the loom stops. Based on the loom rotation angle signal output from the rotary encoder 30, the control device 2 recognizes the loom rotation angle at predetermined intervals from the rotation start position S1 to the stop position S2 of the loom during the one rotation of the loom. Stored in the storage unit. Of the warp tension measured in the load cell 20, the warp tension corresponding to each loom rotation angle stored in the control device 2 is stored in the storage unit. A warp tension diagram measured by one rotation of the loom is shown by a solid line in FIG.

  In the control device 2, an average warp tension A of the warp tension stored in the storage unit is calculated and stored. The average warp tension A is compared with a preset operation target warp tension X, a deviation A1 is calculated, and the deviation A1 is stored as a correction value. The correction value, that is, the deviation A1 is the difference between the actual warp tension (the warp tension diagram indicated by the one-dot chain line in FIG. 2) and the measured warp tension (the warp tension diagram indicated by the solid line in FIG. 2) during loom operation. The amount of change in warp tension corresponding to the deviation between the two. Accordingly, the loom rotation determined in advance by adding the correction value, that is, the deviation A1, to the warp tension B at the loom stop position S2 which is a predetermined loom rotation angle stored in the storage unit of the control device 2. The return target warp tension C at the angle is calculated and set in the storage unit of the control device 2.

  When the operator depresses the warp feeding motor drive switch 28 on the function panel 21, the warp feeding motor 3 is reversed based on the program set in the control device 2 to increase the tension of the warp T. When the warp tension measured by the load cell 20 matches the return target warp tension C, the warp feeding motor 3 is automatically stopped.

  Note that it is more efficient if a program is set so that this operation is automatically performed only by pressing the warp tension return switch 27. It is also possible to set so that the adjustment operation to the return target warp tension C is performed by driving both the warp feeding motor 3 and the woven fabric winding motor 14. After setting the temporary target warp tension, the warp tension return switch 27 is pressed to match the temporary warp tension to the temporary target warp tension. The loom is rotated to measure the warp tension and set the return target warp tension. It is also possible to set a program for continuously performing a series of operations of setting work and warping tension to match the return target warp tension, and automatically adjusting the tension of the warp T. By automating the work in this way, the burden on the operator can be reduced, and the warp tension adjustment work can be performed more efficiently.

  When the warp tension matches the return target warp tension, the loom is ready for operation, and the operator can start the loom by pressing the start switch 23 of the function panel 21. Note that by pressing the warp tension return switch 27, it is also possible to set a program for automating all operations from the warp tension matching operation to the temporary target warp tension to the start of operation of the loom. In this way, the operator can start the operation of the loom simply by pressing the warp tension return switch 27, which is most efficient.

The above-described first embodiment of the present invention has the following effects.
(1) Measure the warp tension during inching rotation under the actual weaving conditions, and set the return target warp tensions C and C1 from the measurement results. Weaving can be performed in the warp tension state, which can greatly contribute to prevention of weaving steps at the start of operation.
(2) The warp tension diagram between the operation of the loom and the inching operation when the loom is stopped shows the peculiarity that even if there is a difference in the absolute value of the warp tension, the phase in the loom rotation angle direction hardly changes (FIG. 2). The return target warp tensions C and C1 are calculated by using the warp tension diagram shown by the solid line and the alternate long and short dash line), and the loom rotation angle determined in advance to set the return target warp tensions C and C1 is free. Can be set to This means that the warp tension can be adjusted appropriately for restoring the tension regardless of the position of the loom.
(3) The temporary target warp tension is set even when almost no warp tension is applied, such as when setting a new fabric, and the warp tension is measured after the warp T is kept in a constant tension state. The tensions C and C1 can be set appropriately.
(4) Since the calculation of the return target warp tensions C and C1 requires only a very simple calculation formula using the measured warp tensions A and B and the operation target warp tension X, the program set in the control device 2 is extremely different. Can be simple.
(5) If the predetermined loom rotation angle for setting the return target warp tensions C and C1 is set as the loom rotation start position or stop position at the time of warp tension measurement, there is no need to select another loom rotation angle. So setting is easy. In particular, if the loom is set at the loom stop position, the warp tension adjustment for returning can be performed without performing alignment as in the case of other loom rotation angles, which is extremely efficient. In addition, when the loom rotation angle determined in advance is set as the loom rotation start position, if the inching rotation amount for measuring the warp tension is one rotation of the loom or an integer multiple thereof, the loom alignment is the same as the stop position. However, in the case of other rotation amounts, it is necessary to align the loom in the same manner as other loom rotation angles.
(6) Since the inching rotation amount for measuring the warp tension is set to one rotation of the loom, all changes in the warp tension can be measured most efficiently.

(Second Embodiment)
The calculation of the correction value and the return target warp tension C according to the present invention can obtain the same result by an approach from a direction different from the method described in the first embodiment. That is, in the loom, the warp tension greatly fluctuates due to the warp opening movement, and therefore a normal easing movement is added to alleviate this. Since the warp opening movement and easing movement are the same during both the normal operation and the inching operation when the loom is stopped, the warp tension diagrams shown by the solid line and the one-dot chain line in FIG. 2 are almost the same. It is in the form of In other words, when the warp tension is low or high, the warp tension diagram in FIG. 2 is only displaced in the warp tension direction (vertical axis direction), and the phase in the loom rotation angle direction (horizontal axis direction) changes almost. There is a peculiar situation that the loom does not. Therefore, the deviation between the average warp tension in the warp tension diagram and the warp tension at the loom rotation angle is substantially the same during normal operation and inching operation of the loom when the loom is rotatable.

  In view of such circumstances, in the second embodiment, the average warp tension A of the warp tension measured during one rotation of the inching operation of the loom is a warp tension B at the loom stop position S2 that is a predetermined loom rotation angle. And a deviation B1 (see the phantom line in FIG. 2) is calculated and used as a correction value. The deviation B1 is the same as the deviation from the average value of the warp tension at the stop position S2 of the loom during operation of the loom (the target warp tension X during operation) (see the one-dot chain line in FIG. 2). Since this correction value, that is, the deviation B1, is substantially the same as the deviation from the average value of the warp tension during normal operation of the loom as described above, the deviation B1 is set to the preset target warp tension X during operation. And the obtained warp tension is set in the control device 2 as a return target warp tension C1 at a predetermined loom rotation angle. Here, the calculation formula of the return target warp tension C in the first embodiment is represented by C = (X−A) + B, and the calculation formula of the return target warp tension C1 in the second embodiment is C1 = X + ( B-A). Therefore, the right side of both formulas shows that the same calculation result is obtained, and the return target warp tensions C and C1 in the first embodiment and the second embodiment are the same. Can be implemented. The second embodiment can obtain the same operational effects as (1), (2) and (4) to (6), which are the operational effects of the first embodiment.

(Third embodiment)
For example, if the weaving machine has been stopped for a long time and the warp tension has changed greatly from the target warp tension X during operation, or the target warp tension X during operation set in advance during weaving of the same fabric. However, since a problem occurs, there are cases where the target warp tension X during operation must be changed. In such a case, unlike the machine setting, the warp tension is so high that there is no inconvenience to rotating the loom, so the setting of the return target warp tensions C and C1 and the adjustment of the warp tension for return are not shown. 4 can be performed only by the work shown in the flowchart of FIG. 4, and the work of the flowchart shown in FIG. 3 can be omitted. In addition, the third embodiment can obtain the same operational effects as (1), (2) and (4) to (6) which are the operational effects of the first embodiment.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) The measurement of the warp tension for setting the return target warp tensions C and C1 is not limited to the forward rotation inching as in the above-described embodiments, but can be performed by the reverse inching.
(2) The loom rotation amount at the time of measuring the warp tension for setting the return target warp tensions C and C1 is not limited to one rotation as in the above-described embodiments, and may be performed by a plurality of rotations. Further, the rotation amount of the loom may be less than one rotation as long as it includes a predetermined loom rotation angle that is a loom position for setting the return target warp tensions C and C1.
(3) The predetermined loom rotation angle, which is the loom position for setting the return target warp tensions C and C1, is not limited to the rotation start position or the stop position of the loom as in the above embodiments, but other loom rotation angles It can be set freely. In this case, it is necessary to move the loom to a predetermined loom rotation angle when setting the return target warp tensions C and C1 at the latest.
(4) Since the rotation angle of the loom can always be grasped by a signal from the rotary encoder 30, the warp tension can be measured by inching operation for a predetermined time from the rotation start position of the loom, and the present invention can be carried out.
(5) In the case of a woven fabric using stretchable warp yarns, it is possible to calculate the return target warp tensions C and C1 by adding a correction coefficient considering elongation to the correction value.
(6) The temporary target warp tension in the first embodiment may be the same value as the target warp tension X during operation. It is also possible to make the value higher than the target warp tension X during operation.

It is the schematic which shows the whole loom. It is a warp tension diagram of a loom. It is a flowchart which performs warp tension adjustment. It is a flowchart which performs warp tension adjustment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loom drive motor 2 Control apparatus 3 Warp sending motor 4 Warp beam 6 Tension roller 15 constituting warp tension detection device Tension lever 18 constituting warp tension detection device Detection lever 20 constituting warp tension detection device Warp tension detection device Load cell A constituting the average value of the measured warp tension C Return target warp tension X Target warp tension during operation A1 Deviation between the average value of the measured warp tension and the target warp tension during operation B1 The average value of the measured warp tension and in advance Deviation from the warp tension measured at the specified loom rotation angle

Claims (6)

In a loom equipped with a dedicated warp feeding motor that rotates a warp beam, a warp tension detection device, and a control device in which a target warp tension during operation is preset.
Prior to the operation of the loom, the loom is rotated and the warp tension during rotation is measured by the warp tension detection device, and a correction value is calculated and corrected based on the measured warp tension and the target warp tension during operation. A return target warp tension at a predetermined loom rotation angle is calculated using the value, set in the control device, and at least the warp feeding motor is driven to match the warp tension with the return target warp tension. A warp tension adjusting method in a weaving machine.   Prior to the measurement of the warp tension, the temporary target warp tension is set in the control device, and the warp tension is made to coincide with the temporary target warp tension. .   The correction value is a deviation between the average value of the measured warp tension and the target warp tension during operation, and the return target warp tension is calculated by adding the correction value to the warp tension measured at the predetermined loom rotation angle. The method for adjusting the warp tension in the loom according to claim 1 or 2, wherein the calculation is performed by adding.   The correction value is a deviation between the average value of the measured warp tension and the warp tension measured at the predetermined loom rotation angle, and the return target warp tension is calculated by adding the correction value to the target warp tension during operation. The method for adjusting the warp tension in the loom according to claim 1 or 2, wherein the calculation is performed by adding.   The warp tension in the loom according to any one of claims 1 to 4, wherein the predetermined loom rotation angle is a rotation start position or a stop position of the loom when the warp tension is measured. Adjustment method.   The warp tension adjusting method for a loom according to any one of claims 1 to 5, wherein the loom is rotated once during the measurement of the warp tension.

Images