JP5366102B2 - Loom warp control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loom eliminating weft yarn unevenness caused by difference between woven cloth winding-up amount of a cloth winding roll and a delivery amount of warp of a warp beam. <P>SOLUTION: There is provided a warp control device of the loom comprising a delivery control part 23 driving a warp beam according to a correction result corrected to eliminate a deviation of tension against to the basic speed by generating the basic speed based on rotation speed of the main shaft 17 detected in every previously determined period during a stable operation, in switching from one rotation speed to the other rotation speed of the main shaft 17 which are previously determined after stable operation into a plurality of rotation speeds, wherein in switching the rotation speed of the main shaft 17, the delivery control part 23 generates the basic speed proportionating the rotation speed of the main shaft 17 every detection based on the rotation speed of the main shaft 17 continuously detected for every period shorter than predetermined period during the stable running during a first period predetermined to include at least a part of the switching period. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

In the present invention, a plurality of rotational speeds of the main shaft of the loom after steady operation are set in advance, and during the weaving operation of the loom, the rotational speed of the main shaft of the loom is updated during the weaving as the weft insertion pick number is updated. In the loom of the type that changes from the set one rotation speed to the other rotation speed, the difference between the woven fabric winding amount and the warp feed amount during the period in which the rotation speed of the main shaft after steady operation is changed. The present invention relates to a technique for making the resulting weft density unevenness less noticeable.

Patent Document 1 and Patent Document 2 disclose a warp control device for a loom. The warp control device of the loom is based on a winding control device that drives a clothing roll by a winding motor that operates at a predetermined ratio in synchronization with the loom crankshaft (loom main shaft), and a rotation signal of the crankshaft. The number of rotations of the loom is detected and the basic speed is obtained, while the warp beam is driven by a feed motor that is driven in accordance with a speed signal corrected in a direction to cancel the tension deviation based on the deviation of the warp tension with respect to the basic speed. And a control device.

More specifically, regarding the delivery control device, a PI (proportional integral) calculator that outputs a correction amount Mp in a direction to cancel the tension deviation, a set driving density, a detected rotational speed of the loom, and a diameter of the warp beam And a speed calculator that calculates a basic speed No based on the weft driving density and outputs a speed command N corrected by a correction amount Mp with respect to the basic speed No, and is output from the speed calculator. The delivery motor is driven based on the signal.

Further, the delivery control device outputs the basic speed in advance in response to the selection signal for the operating speed of the loom. When the operation speed signal is switched, the delivery control device switches to the basic speed corresponding to the selection signal and drives the warp beam.

Patent Document 3 discloses a technique for changing the operating speed of a loom in response to switching of a selected weft as a technique for improving productivity for high-value-added fabrics in recent years. Disclosure. More specifically, the loom operating rotational speed control device is a multi-color weft loom that selectively wefts a plurality of wefts having different flying characteristics, and sets the allowable maximum rotational speed of the loom corresponding to the type of the selected weft. Stored in advance for each weft insertion pick number, and during weaving operation, when switching to wefts with different flying characteristics by updating the weft insertion pick number, the operation speed of the loom (that is, the rotation speed of the main shaft) is changed after the switching. Is operated at the allowable rotational speed corresponding to the yarn type.
JP-A-8-246299 JP-A-62-263374 JP-A-5-78955

According to the techniques disclosed in Patent Documents 1, 2, and 3, there is a problem that uneven weft density occurs each time the operating speed of the loom is switched. However, no technique for effectively eliminating this has been known so far. According to the inventor's research, the cause of unevenness in the weft density is due to the difference in the control mode between the winding control device and the delivery control device, and the operation speed of the loom is cut by switching the selected weft. It was found that the cause was that the woven fabric take-up amount and the warp feed amount were different during the change of the operation speed when changing.

Specifically, since the winding control device is driven in synchronism with the rotation of the loom, the rotation speed of the main shaft is changed from one set speed to the other set rotation speed with respect to the switching of the loom operating speed. In the meantime, it is driven by following the rotational speed of the main shaft accurately. On the other hand, the basic speed is updated every several picks in the delivery control device, and in the delivery control device, the basic speed is immediately switched to a value corresponding to the final spindle rotational speed by the operation speed switching signal of the loom. It will be. Under such circumstances, the warp sending speed is changed at an earlier point in time with respect to the change in the winding speed of the woven fabric when the operating speed of the loom is switched.

For example, when the loom operating speed switches from a high speed to a low speed, the winding speed gradually decreases in synchronism with the decrease in the loom operating speed (spindle rotation speed) during the change period of the loom operating speed. On the other hand, the delivery speed of the delivery control device decreases instantaneously, and the warp delivery amount during this period becomes insufficient. As a result, the warp tension increases and the pre-weaving position moves in the backward direction of the weaving machine (the warp sending side), and the weft density becomes dense (thick step). On the contrary, when the rotational speed is switched from a low speed to a high speed, a completely opposite phenomenon occurs.

Such a problem does not occur when the basic speed is switched by the operation speed selection signal, that is, in the warp feeding device of the type that corrects the tension deviation for a single basic speed, the opposite phenomenon occurs. To do. For example, if the operating speed of the loom is switched from a high speed to a low speed, for example, the delivery control device changes the operating speed until the speed command is suppressed to a low level after the tension control result correction amount is changed. The warp yarn is excessively fed out at a high speed before switching, and the weft density becomes coarse (thin step).

The object of the present invention is to change the rotational speed of the main shaft of the loom from the one rotational speed set in the middle of the weaving to the other rotational speed during the weaving operation, during the weaving operation of the loom. In the conventional type of loom, there is an inconvenience that has occurred in the past, that is, the difference between the winding amount of the warp running member during the period in which the rotation speed of the main shaft is changed, specifically, the amount of woven fabric wound by the apparel roll and the amount of warp delivered by the warp beam This is to make the unevenness of the weft density due to the less noticeable.

Based on the above-mentioned problems and objects, the warp control method for a loom according to the present invention is configured such that a plurality of rotational speeds of a main shaft of a loom after steady operation are set in advance, and the rotational speed of the main shaft is determined in a predetermined change period A warp control device used in a loom that changes from one set rotation speed to the other rotation speed, wherein the warp control device drives a clothing roll in synchronization with the rotation of the main shaft. And generating a basic speed based on the rotational speed of the main shaft detected every predetermined period during steady operation, and correcting the basic speed in a direction to cancel the tension deviation of the actual warp tension. In a warp control device for a loom having a feed control unit for driving the warp beam, the feed control unit includes at least a part of the predetermined change period when the rotational speed of the main shaft is changed. Fixed Every period shorter than the predetermined period during the steady operation over a first period that is set so that the starting point is before the first strike time in the predetermined change period. The basic speed proportional to the rotational speed of the main shaft is generated for each detection based on the rotational speed of the main shaft detected continuously.

According to the present invention, in the process of switching the rotational speed of the main shaft of the loom, the difference between the woven fabric winding amount and the warp feed amount during the change period of the main shaft rotational speed is reduced as compared with the conventional warp control device. Therefore, the weft density unevenness (weaving step occurring during operation) due to this can be made less noticeable.

FIG. 1 shows an outline of the loom 1, in particular, a portion related to a warp 2 feeding operation and a woven fabric 8 winding operation. In FIG. 1, a large number of warps 2 are fed out as a sheet from a warp beam 3, passed through a plurality of reeds 5 and reeds 6 through a back roll 4, and an opening 7 is formed by upper and lower warps 2 by opening movement of the reed 5. The woven fabric 8 reaches the pre-woven 9 while forming.

On the other hand, the weft 10 is weft-inserted into the openings 7 of the upper and lower warps 2 and then beaten on the front 9 by the beating movement of the reed 6 and woven into the woven fabric 8. The woven fabric 8 passes through the guide roll 11, the press roll 12, the clothing roll 13 and the press roll 14, and is finally wound around the cloth winding beam 15.

The opening movement of the reed 5 and the striking movement of the reed 6 are interlocked with the rotation of the main shaft 17 of the loom 1. The main shaft 17 is driven by a main shaft motor 16. The rotation of the main shaft 17 is converted into an opening motion by, for example, an electronic dobby opening device 18 and transmitted to each of the scissors 5, and is also converted into a striking motion by the striking motion conversion device 19 and transmitted to the scissors 6. .

The spindle motor 16 is driven by the spindle drive unit 27. The selection signal generator 30 inside the warp control device 22 generates a rotation speed switching signal based on the spindle angle signal θ and sends it to the spindle drive unit 27, as will be described in detail later. On the other hand, in the spindle drive unit 27, a change mode of the rotation speed of the spindle is set in advance corresponding to the input mode of the rotation speed switching signal, and the spindle drive unit 27 rotates a plurality of the set spindles 17. The speed is switched by gradually changing from one rotational speed to the other rotational speed. A plurality of rotational speeds of the main shaft 17 during the weaving operation are set in advance.

The warp beam 3 and the clothing winding roll 13 are driven by a delivery motor 20 and a winding motor 21, respectively. The warp beam 3 and the cloth winding roll 13 can move the warp yarn 2 and the woven fabric 8 back and forth by both rotations or only one rotation. For example, if only the clothing roll 13 rotates further in the winding direction when the rotation speed of the main shaft 17 is switched, the tension of the woven fabric or warp is increased by that amount, so that the warp 2 is taken up together with the woven fabric 8. Since it moves in the direction (forward), the fabric 9 also moves in the same direction.

The feeding motor 20 is driven by a feeding control unit 23 and a driving unit 25 inside the warp control device 22, and the winding motor 21 is driven by a winding control unit 24 and a driving unit 26 inside the warp control device 22. . The winding control unit 24 is driven to synchronize with the rotation of the main shaft 17 of the loom 1. On the other hand, an angle detector 28 is connected to the main shaft 17, and the main shaft angle signal θ (so-called loom crank angle signal) as an output of the angle detector 28 is directly or indirectly transmitted to the sending control unit 23, the winding. Output to the take control unit 24 and the spindle drive unit 27. For this reason, the winding control unit 24 can be driven to synchronize with the rotation of the main shaft 17 of the loom 1 based on the main shaft angle signal θ. The spindle angle signal θ is also output to the sending control unit 23 and the spindle driving unit 27 and used for each control.

In the main shaft drive unit 27, parameters related to changing modes such as the number of rotations of the loom during the weaving operation, that is, a plurality of set rotation speeds and change gradients of the rotation speed with respect to the main shaft 17 after the steady operation are selected. Is set in advance corresponding to the input mode of the rotation speed switching signal. For this reason, after the loom 1 is operated in a steady state, the rotation speed switching signal is generated from the selection signal generation section 30, so that the spindle drive section 27 changes the rotation speed of the spindle 17 to one rotation in a predetermined change period according to the above parameters. The rotational speed of the main shaft 17 is switched by gradually changing from the speed toward the other rotational speed. On the other hand, the warp control device 22 includes a winding control unit 24 that drives the clothing winding roll 13 and a delivery control unit 23 that drives the warp beam 3 in order to drive the clothing winding roll 13 and the warp beam 3 together. As a driving mode, the winding control unit 24 drives the clothing roll 13 in synchronization with the rotation of the loom 1, and the sending control unit 23 corrects the basic speed in a direction to cancel the tension deviation with respect to the target tension of the warp yarn 2. Then, the warp beam 3 is driven.

And in the loom that changes the rotation speed of the main spindle from one rotation speed set in advance toward the other rotation speed in the predetermined change period as described above, the warp control method of the loom according to Examples 1 to 5 below is At least one of the two control units, that is, the feeding control unit 23 and the winding control unit 24, has a driving mode different from the normal driving mode included in the control unit, and the rotational speed of the spindle is changed. In a predetermined change period of the rotational speed of the main shaft 17 to be changed, the difference between the woven fabric winding amount and the warp feeding amount when both the two control units are operated in the normal driving mode is reduced. A driving mode is set. When the rotational speed of the main shaft 17 is changed, the at least one control unit temporarily operates in the set different driving mode for the first period determined to include at least a part of the predetermined change period. By operating automatically, the difference between the woven fabric winding amount and the warp feeding amount is eliminated.

Further, in the weft control method of the loom according to the sixth embodiment that specifically constitutes the present invention, the winding control unit 24 that drives the clothing roll 13 in synchronization with the rotation of the main shaft 17, and the detected main shaft 17. A basic speed is generated based on the rotational speed, and a feed control unit 23 that drives the warp beam 3 according to a correction result obtained by correcting the basic speed in a direction to cancel the tension deviation is provided. Thus, the basic speed is generated based on the continuously detected rotational speed of the main shaft 17, and the difference between the woven fabric winding amount and the warp feeding amount is eliminated.

Below, the warp control method of the loom by Examples 1-6 is demonstrated concretely.

FIG. 2 shows a connection example of the sending control unit 23, the driving unit 25, the winding control unit 24, the driving unit 26, the timing signal generator 29, the selection signal generating unit 30 and the spindle driving unit 27 in the warp control device 22. Show.

In FIG. 2, during the operation of the loom 1, the selection signal generation unit 30 inputs the spindle angle signal θ from the angle detector 28, and controls the rotation speed switching start timing (weft insertion pick number) as a set value. A rotation speed switching signal is generated at a time designated based on data such as a switching start time and a control switching period, and is output to the speed command unit 31 in the spindle drive unit 27. In the speed command unit 31, in addition to a plurality of rotational speeds of the main shaft 17 as setting values, parameters related to the manner of changing the rotational speed with respect to the main shaft 17 such as a speed change gradient during the rotational speed change period are set in advance. The speed command unit 31 drives the inverter 32 at a designated rotational speed and rotates the spindle motor 16 such as an induction motor.

When the operation of the loom 1 reaches a predetermined rotational speed switching start timing (predetermined weft insertion pick number) after the steady operation, the selection signal generator 30 generates a rotational speed switching signal based on the set value, and a speed command To the unit 31. For this reason, the speed command unit 31 drives the inverter 32 according to the related parameters, and gradually changes the rotational speed of the main shaft 17 with a predetermined speed change gradient during the rotational speed change period.

The winding base speed generation unit 33 of the winding control unit 24 generates a winding base speed signal proportional to the rotational speed of the main shaft 17 based on the driving density (weft density) as the set value and the main shaft angle signal θ. The winding base speed signal is sent to the pulse generator 35 via the switch 34, and converted into a pulse driving amount signal (winding speed command) by the pulse generator 35, and the driving unit 26 as a servo amplifier. To the addition input terminal of the forward / reverse counter 36. Since the winding base speed signal is proportional to the rotational speed of the main shaft 17, the clothes winding roller 13 driven based on the rotation speed follows the change in the rotational speed of the main shaft 17.

The forward / reverse counter 36 drives a current generator 37 by outputting a signal corresponding to a pulse count value, which is a subtraction result between the number of input pulses from the addition input terminal and the number of input pulses from the subtraction input terminal, as a speed command. Then, the winding motor 21 by the servo motor is rotated in the direction in which the woven fabric is wound. The rotation of the winding motor 21 is detected as a pulse signal by the pulse generator 38, and is input to the subtraction input terminal of the forward / reverse counter 36 to constitute a closed loop control system for the pulse signal from the pulse generator 35 input as a speed command. . The pulse signal from the pulse generator 38 is also input to the current generator 37 and used for control for generating a current corresponding to the rotation angle of the motor 21, for example. Thus, in the normal driving mode, the winding control unit 24 and the driving unit 26 drive the winding motor 21 while following the rotation amount of the main shaft 17 of the loom 1.

On the other hand, the timing signal generator 29 inputs the main shaft angle signal θ from the angle detector 28 for the feed control of the warp yarn 2, and receives a signal indicating a predetermined rotation angle of the main shaft 17, for example, a rotation angle of 0 ° and a rotation angle. A 20 ° signal is generated and sent to the tension controller 39 and the delivery base speed generator 40 of the delivery controller 23.

On the other hand, for the delivery control unit 23, the tension control unit 39 receives the actual tension signal of the warp 2 from the tension sensor 47 every time a 20 ° signal is input, detects the warp tension, and outputs the 0 ° signal. At the time of input, the average value of the warp tension values of a total of 18 sampling warp tensions detected every 20 ° during one rotation of the spindle 17 is calculated, and a predetermined calculation is performed on the deviation amount between the average value and the target value. For example, PID calculation is performed to calculate a correction amount in a direction to eliminate the tension deviation, and this correction amount is output to the addition point 48 as a tension control signal. In FIG. 1, for example, the tension sensor 47 is incorporated at the support position of the back roll 4, detects the tension of the warp 2 from the resultant force of the warp 2 acting on that position, and the tension signal of the actually detected tension value. Is output to the tension control unit 39. Further, the sampling control for calculating the average value of the warp tension is not limited to that performed by the spindle angle signal, but may be performed by a clock signal.

The tension control unit 39 is preferably corrected by interrupting the tension control and not correcting the deviation in the process of switching the rotational speed of the main shaft 17 or by disabling the tension control so that it does not substantially act. Reduce the amount. According to the suppression of the correction amount, the driving of the feed motor 20 by a speed pattern or the like performed as a different driving mode described later is not canceled by the tension deviation.

The sending base speed generator 40 detects the rotational speed of the spindle 17 based on the input period of the 0 ° signal, and stores it in correspondence with the rotational speed switching signal. That is, when a rotation speed switching signal is input to the delivery base speed generation unit 40, the delivery base speed generation unit 40 reads the corresponding rotation speed from the stored information on the rotation speed of the main shaft 17, and sets the driving density and the like. Based on the setting value such as the gear ratio of the drive system, the basic speed (transmission base speed) is determined, and the transmission base speed signal is output to the addition point 48.

As a result, the output of the addition point 48 becomes a delivery speed command in which the delivery base speed is corrected in the direction of canceling the tension deviation of the warp 2. This delivery speed command signal enters the pulse generator 43 via the switch 42 and is converted into a pulse driving amount signal (sending speed command) by the pulse generator 43, so that the drive unit 25 as a servo amplifier is positively connected. The signal is input to the addition input terminal of the inverse counter 44. Note that the pulse generator 43 corrects the output (drive amount signal) with the winding diameter signal. The winding diameter signal represents the winding diameter of the warp 2 with the warp beam 3, and is detected by an appropriate winding diameter sensor 49 as shown in FIG. It should be noted that a known technique for indirectly determining the beam winding diameter from the relationship of the amount of rotation of the beam per unit period may be employed instead of the direct detection by the sensor described above.

The forward / reverse counter 44 drives the current generator 45 based on the speed command (count value), and rotates the feeding motor 20 by the servo motor in the direction in which the warp is sent out. The rotation of the delivery motor 20 is detected as a pulse signal by the pulse generator 46 and is input to the subtraction input terminal of the forward / reverse counter 44 to constitute a closed loop control system similar to the above delivery control unit. The signal is also input to the current generator 45, and control is performed so as to follow the input pulse signal in the same manner as the drive unit 26 of the winding part. Thus, in the normal drive mode, the delivery control unit 23 and the drive unit 25 drive the delivery motor 20 based on the result of correcting the delivery base speed with the tension deviation of the warp 2.

The normal drive mode (normal control) of the delivery motor 20 is as described above. On the other hand, during the operation of the loom 1, the control of the delivery motor 20 is performed when the rotational speed of the main shaft 17 is switched (changed). Is switched from normal control to control based on the speed pattern by the switch 42. That is, the selection signal generation unit 30 sends a control switching signal to the speed signal generation unit 41 when detecting the rotation speed switching start timing from the spindle angle signal θ, and starts the speed signal generation unit 41 at the same time via the switch 42. To the speed command signal generator 41. Further, by supplying the control switching signal to the tension control unit 39 as necessary, the correction operation for the sending base speed can be suppressed or invalidated as described above.

As a result of this switching, the speed command signal as the output of the speed signal generating unit 41 is replaced with the output of the addition point 48 (tension control signal-sending base speed signal) over a predetermined control switching period from the control switching start timing. Input to the generator 43. For this reason, when the rotational speed of the main shaft 17 is switched (changed), the pulse generator 43 generates a drive amount signal (speed command) according to a preset set value (speed pattern) over a predetermined control switching period. The drive unit 25 is driven by this drive amount signal (speed command). After that, when the first period elapses, the transmission base speed generation unit 40 is switched again via the switch 42, and the suppression of the tension control is released and the normal driving is resumed.

According to the specific example of FIG. 2, the winding control unit 24 is also provided with a switching device 34 similar to the transmission control unit, and a control switching signal and a speed command signal indicated by dotted lines are sent to the switching device on the winding control unit side. By supplying to 34, it is possible to drive in a driving mode different from normal as in the case of the sending control unit. More specifically, in the process of switching (changing) the rotational speed of the main shaft 17, the output (drive amount signal) of the take-up control unit 24 and the output (drive amount signal) of the take-up control unit 23 are also switched by the switch 34. The speed signal generator 41 can be switched to control based on a speed command signal based on the speed pattern. Therefore, a speed command signal based on the sending speed pattern and a speed command signal based on the winding speed pattern can be set in advance in the speed signal generator 41.

However, in the process of switching (changing) the rotational speed of the main shaft 17, the present invention is not limited to a mode in which both the feed control unit 23 and the take-up control unit 24 are simultaneously operated in a drive mode different from the normal drive mode, and the feed control unit 23 and the take-up control. A mode in which only at least one of the units 24 is operated in a driving mode different from the normal mode, that is, only a transmission control unit 23 is operated, for example, by supplying a control switching signal only to one of the corresponding switching units. In addition, it is assumed to include a mode in which only the winding control unit 24 is operated.

FIG. 3 shows a timing chart of the operation of the warp control device 22 in the process of switching the rotational speed of the main shaft 17. In the example of FIG. 3, the selection signal generator 30 receives the spindle angle signal θ, and when the rotation amount of the spindle 17 reaches 100 (the weft pick count value, ie, the weft pick pick number is 100), In response to the speed command unit 31 of 27, the conventional rotational speed switching signal (rotational speed selection signal r1) is switched to the rotational speed switching signal (rotational speed switching signal r2). At this time, the speed command unit 31 and the inverter 32 drive the spindle motor 16 based on the speed pattern having the speed change gradient designated by the rotation speed switching signal r2, and the rotation speed (rpm) of the spindle 17 from 900. Reduce to 400. The time length of the speed switching step 1 (speed change period of the main shaft 17) is determined by the set speed change gradient.

As described above, the winding base speed generation unit 33 of the winding control unit 24 generates the winding base speed signal based on the driving density (weft density) and the spindle angle signal θ as the set values. The winding base speed signal is proportional to the rotational speed of the main shaft 17. Therefore, the output of the winding control unit 24 changes from the speed command v11 to the speed command v12 following the change in the rotation speed of the main shaft 17, and the rotation speed of the winding motor follows the change in the rotation speed of the main shaft 17. Will do.

On the other hand, the delivery drive unit 23 corrects the normal control (normal drive mode), that is, the delivery base speed (basic speed) with the tension deviation of the warp 2 up to the rotation amount 99 (weft insertion pick number 99) of the main shaft 17. As a result, a drive amount signal (speed command) is output. During this time, the speed signal generation unit 41 updates the weft insertion pick number for each rotation of the main shaft 17. However, when the rotation amount of the main shaft 17 reaches 100 (weft insertion pick number 100), the speed signal generation unit 41 outputs the selection signal from the selection signal generation unit 30. Since the control switching signal is output, the sending drive unit 23 outputs a drive amount signal (speed command) of a speed command signal based on the speed pattern set in the speed signal generation unit 40.

That is, the selection signal generator 30 detects the rotation speed switching start timing from the spindle angle signal θ, and when the rotation of the spindle 17 reaches the rotation amount 100 (weft insertion pick number 100), the control switching signal is sent to the speed signal generator 41. Send to. This control switching signal is output during the first period, that is, until the rotation amount 102 (weft insertion pick number 102) of the main shaft 17 is reached. By this control switching signal, the speed signal generating unit 41 is activated, and at the same time, the switching unit 42 is switched over the control switching period (first period), and the operation of the tension control unit 39 is suppressed or invalidated as necessary. .

As a result, when the rotational speed of the main shaft 17 is switched (changed), the control of the delivery motor 20 is controlled normally by the switch 42 simultaneously with the start of the first period (tension control) by the output control switching signal. Is switched to the control based on the speed pattern by the speed signal generator 41, and after the first period, that is, when the rotation amount 102 (weft insertion pick number 102) of the main shaft 17 is reached, the switch 42 again returns to the original normal state. Returned to control (tension control). For this reason, in the first period, the warp beam 3 rotates based on a preset speed pattern regardless of the tension of the warp 2.

The speed pattern during the first period reduces the difference between the winding amount of the woven fabric 8 and the delivery amount of the warp 2 during the switching period of the speed switching step 1 (speed changing period of the main shaft 17). The winding amount and the delivery amount of the warp 2 are set to be as equal as possible. According to this example, as indicated by the circled number 1, the speed command v21 for normal control is used, and the speed command v21 The gradient when decelerating to the speed command v22 is also set to be substantially the same as the manner in which the rotational speed of the main shaft 17 changes, in other words, the gradient when the winding motor 21 decelerates.

As described above, when setting the speed pattern, the operator uses a setting device (not shown) to indicate the control switching start timing, the control switching period, the spindle speed change amount, and the like as parameters for the speed pattern. And is automatically generated inside the speed signal generator 41. Note that the speed pattern is not limited to a straight line with a constant slope such as the circled number 1, but various curves or multi-steps with different step differences such as the circled number 2 in FIG. As shown in FIG.

As is apparent, the control based on the speed pattern at the time of switching the rotational speed of the main shaft 17 is not limited to the sending control unit 23, but also performed on the winding control unit 24 as shown by the dotted line in FIG. You can also. In the control based on the speed pattern for the winding control unit 24, the speed pattern may be the same for both sending and winding. When both speeds are changed similarly, the setting mode of the speed pattern is the main shaft 17. Any setting that does not take into account the change in the rotation speed, for example, a linear change, a step change, and switching by various curves can be considered.

In addition, about the driving | running | working form of the clothing roll 13, it is good also as a structure driven not only by motor drive but mechanical rotation by rotation of the main axis | shaft 17. FIG. In the mechanical winding drive, the winding control unit 24 and the winding motor 21 are not required. In such a case, the above-described different driving is realized by the above-described sending control unit.

FIG. 4 shows an operation timing chart of the warp control device 22 according to the second embodiment. In the second embodiment, the control of the delivery control unit 23 is switched to the control based on the speed pattern in the process of switching (changing) the rotational speed of the main shaft 17 while utilizing the configuration of the warp control device 22 of FIG. The normal control as usual is performed without executing the control, and the control of the winding control unit 24 is switched from the normal control (control based on the base speed) to the control based on the speed pattern. It is an example which drives the clothing roll 13 based on the speed pattern of the number 2 with a circle of FIG.

In the second embodiment, the speed pattern of the winding control unit 24 is set corresponding to the sending base speed (switching) under the normal control in the rotation speed change period of the main shaft 17, and the above operation is performed. The clothes winding roll 13 is driven so as to reduce the difference between the winding amount of the woven fabric 8 and the sending amount of the warp yarn 2 during the rotation speed change period. In the case of this control, the switch 42 of the transmission control unit 23 in FIG. 2 and the signal supplied thereto are omitted.

The first embodiment and the second embodiment described above can be modified as follows. In the first period (speed pattern control period), in addition to the setting examples in FIGS. 3 and 4, the starting point is the rotational speed of the spindle 17 as indicated by a circled number 1 as illustrated below in FIG. 4. As the period from the middle of the period of one pick, which is the latter half of the speed switching process 1, which is the change period, to the next pick after the pick in which the speed switching process 1 has been completed, In the speed switching process 1, the period is shorter than that period and is completely within one pick. As indicated by the circled numeral 4, the period from the first pick to the next pick in the speed switching process 1 is further rounded. It can also be set as a period from the pick before the speed switching step 1 to the middle of the pick in the speed switching step 1 as shown in FIG.

Specifically, the length of the rotation speed change period (speed switching step 1) of the main shaft 17 is set to several picks (5 picks) or less, and actually about 1 to 2 picks. On the other hand, the warp traveling members (warp beam 3, clothes winding roll 13) are driven in a direction in which the warp feed amount and the woven fabric take-up amount are balanced by the first beating timing after entering the rotation speed change period. Thus, if the change in warp tension is reduced compared to the conventional drive, the unevenness in the weft density becomes less noticeable than in the prior art. When the change period of the rotational speed of the main shaft 17 (speed switching step 1) spans a plurality of picks, beats that affect the weft density unevenness are multiple times, but if considering the degree of influence (weight) on the weft density unevenness, rotation Since the first strike in the speed change period is followed in the order from the next strike, it is preferable to start such a correction operation from a time point before the first strike.

Therefore, the first period may include a part of the change period of the main shaft 17 and the start point may be before the first strike timing. Specifically, the first period is indicated by a circled number. What is necessary is just to set like 2 to 5. In addition, it is not a good idea to continue the correction operation after the striking time after the end of the first period, when the rotation speed change period ends. For example, in warp feed control, it is not preferable from the viewpoint of tension control that control by a speed pattern, in other words, a state in which tension control is not performed continues for a long time. For this reason, it is desirable to determine the end point of the first period before the next striking timing after the end of the rotation speed change period of the main shaft 17, and specifically, the first period is indicated by a circled number. What is necessary is just to set like 1-5.

In addition, as illustrated in the lower part of FIG. 4, with the rounded numbers 2 to 4, it can be expected that most of the difference in the feed amount will be eliminated by the first striking compared with the conventional case, Considering that the regular density is obtained by hitting a plurality of times, an effect can be expected because the difference in feed amount at the first hit is at least eliminated. In addition, since the woven fabric 8 is elastic, it is effective when it is preferable to precede the control operation in consideration of the delay time until it is transmitted to the pre-weaving 9.

As for the speed pattern (speed amount), those that reduce the deviation between the winding amount of the woven fabric 8 and the warp feed amount are included as compared with the normal driving mode. For example, taking Example 1 as an example, it is ideal to match the speed pattern for the delivery control unit 23 with the amount of change in the rotational speed of the main shaft 17, that is, the amount of rotation of the winding motor 21. However, in reality, the elasticity of the warp 2 and the woven fabric 8 is also affected, so that depending on the type of fabric, the accuracy of the set speed is somewhat coarse, and even if they do not coincide completely, there is no big problem.

FIG. 5 shows a configuration of the transmission control unit 23 according to the third embodiment, and FIG. 6 shows a timing chart of the operation. In the third embodiment, the speed signal generator 41 and the switch 42 are excluded from the configuration of the transmission control unit 23 in FIG. 2, and instead of them, a correction unit between the addition point 48 and the pulse generator 43 as shown in FIG. In the first period, the driving base speed generated is corrected through a correction rate set in advance to realize a driving mode different from normal.

The correction unit 50 receives the speed command (speed command value) from the tension control unit 39 and inputs the set value (correction coefficient α and correction period t) and the control switching signal (correction start timing signal) to the speed command value. The correction is made by multiplying the correction coefficient α, and the corrected speed command value is generated and output to the pulse generator 43. The correction coefficient α is set in advance so as to gradually change over a period from the start point to the end point of the first period.

As shown in FIG. 6, in the period (constant speed period) in which the rotation speed of the main shaft 17 is not changed, the correction unit 50 sets the correction coefficient α = 1, so that the speed command before the change of the rotation speed of the main shaft 17 is set. The speed command v12 after changing the rotation speed of v11 and the spindle 17 is not corrected. However, when the control switching signal (correction start timing signal) is input to the correction unit 50 in the first period in which the rotation speed of the spindle 17 is changed, the correction unit 50 changes the speed after switching (speed command). v12) is used as a reference, and the speed command v = α × v12 is calculated by multiplying the reference speed by a correction coefficient α that changes with time.

The correction coefficient α (α ≠ 0) that changes with time is expressed as α = f (t). In the illustrated example, since the speed command v11> the speed command v12, from 3.5 to 1.0 as an example. It is changing so that it becomes small continuously. For this reason, the speed command v continues in a polygonal line at the beginning of the first period, gradually decreases thereafter, and continues in a polygonal line at the end of the first period.

In the first period, the correction coefficient α can be changed stepwise without being continuously changed. Even if the sampling time t1, which is the time period in which the corrected speed command is output, is somewhat rough, the rotation of the delivery motor 20 changes almost smoothly, so that it does not cause a large practical problem.

FIG. 7 shows a configuration of the transmission control unit 23 according to the fourth embodiment, and FIG. 8 shows a timing chart of the operation. In the fourth embodiment, the speed signal generator 41 and the switch 42 are excluded from the configuration of the transmission control unit 23 in FIG. 2 while using the configuration in FIG. This is an example in which a special delivery base speed generator 55 corresponding to the rotational speed of the main shaft is connected.

The transmission base speed generation unit 55 includes a plurality of base speed generation circuits 51, 52, and 53 and a switch 54 that selectively outputs the output signals. The base speed generation circuits 51, 52, 53 is provided for each rotation speed selection signal of the main shaft 17. The first base speed generation circuit 51 and the second delivery base speed generation circuit 52 are for constant speed rotation, and set a base speed (basic speed) of a constant speed before and after the change of the rotation speed of the main shaft 17. Each occurs. The third base speed generation circuit 53 is for transient rotation for shifting the delivery base speed from the speed before the change to the speed after the change over the first period determined corresponding to the change period of the spindle rotation speed. In this period, a base speed (basic speed) is generated based on the rotational speed of the main shaft 17 detected based on the input period of the main shaft rotation angle signal θ.

As shown in FIG. 8, during the period of constant speed rotation of the main shaft 17, the selection signal generation unit 30 and the switch 54 select the first base speed generation circuit 51 during the period until the weft insertion pick number is 99, Further, after the first period has elapsed (after the period when the weft insertion pick number is 101), the second base speed generation circuit 52 is selected. Since the first base speed generation circuit 51 generates a speed command v11 and the second base speed generation circuit 52 generates a speed command v12, these speed commands v11 and v12 are transmitted as transmission base speed signals in each period. Is output to the addition point 48 every time.

In the first period for switching to the rotational speed of the main shaft 17, the selection signal generator 30 and the switch 54 select the third base speed generation circuit 53 for transient rotation over the first period. At this time, the third base speed generation circuit 53 operates to generate a delivery base speed signal corresponding to the detected change in the rotational speed of the main shaft 17 at every sampling time t1, thereby winding the fabric winding in the change period. The warp beam 3 is driven so as to reduce the difference between the amount and the warp feed amount.

FIG. 9 shows a configuration of the sending control unit 23 according to the fifth embodiment, and FIG. 10 shows a timing chart of the operation. As shown in FIG. 9, the configuration of the sending control unit 23 is almost the same as that in FIG. 7, and the sending base speed generating unit 56 includes a first base speed generating circuit 57, a second base speed generating circuit 58 and a switch. 59. This embodiment is an example in which the different driving modes are realized by switching the basic speed of the transmission control unit with a delay time set in advance with respect to the change period of the rotational speed of the spindle.

As shown in FIGS. 9 and 10, the first base speed generation circuit 57 is for constant speed rotation, and sends speed commands v11 and v12 to the sending motor 20 before and after the speed switching step 1 (speed change period). It has occurred. When the speed switching step 1 is entered, the selection signal generating unit 30 generates a control switching signal and operates the switch 59 to send the speed command v11 of the first base speed generating circuit 57 to the second base speed generating circuit. The speed is switched to the speed command v12 of 58, and the timing of this switching is a delay time t2 from the time of generation of the spindle speed selection signal (rotational speed switching signal).

The delay time t2 is set in advance so that the difference between the woven fabric winding amount and the warp yarn feeding amount during the change period can be reduced. For this reason, when the feed base speed generation unit 56 switches the spindle speed selection signal (the speed command v11 from the generation time of the rotation speed switching signal to the speed command v12 at the time of the delay time t2, the fabric winding amount and warp during the change period are changed. The delay time t2 is optimally set so that the hatched area shown in the figure has the same area, and even if the setting accuracy of the delay time t2 is somewhat coarse, it does not cause a big problem.

FIG. 11 shows the configuration of the sending control unit 23 according to the sixth embodiment. As shown in FIG. 11, the sending control unit 23 does not use the switching devices 42, 54, 59 and the correction unit 50, and sends a sending base speed signal proportional to the rotational speed of the spindle 17 by one sending base speed generating unit 60. Is output to the addition point 48.

In other words, the delivery base speed generation unit 60 receives the output of the angle detector 28 as an input every time a predetermined main shaft angle (0 °) is passed, and updates the main shaft based on the set value (weft driving density). Although a transmission base speed signal proportional to the rotational speed of 17 is generated, if the first period (speed changing period of the main shaft 17) is entered, the rotational speed of the main shaft 17 is changed, for example, every 1 ° when the angle signal is input. By generating a proportional delivery base speed signal, a delivery base speed signal is generated in synchronization with the rotation of the main shaft 17 and proportional to the rotational speed. As a result, the rotational speed of the delivery motor 20 follows the rotational speed of the main shaft 17.

In this way, the delivery control unit 23 generates a delivery base speed signal (basic speed signal) based on the detected rotational speed of the main shaft 17, and corrects the basic speed so as to eliminate the tension deviation. The warp beam 3 is driven according to the corrected result. Note that the magnitude of the transmission base speed signal can be arbitrarily set by setting a coefficient inside the transmission base speed generation unit 60.

Incidentally, the warp beam 3 may be a mechanical drive device that transmits the rotation of the main shaft 17 to the warp beam 3 instead of the feed motor 20. When the warp beam 3 is driven by the mechanical drive device, the delivery control unit 23 adjusts the rotation transmission ratio of the mechanical drive device based on the rotational speed of the main shaft 17 that is continuously detected. For this reason, the winding drive is not limited to electric drive, and includes a form of mechanical drive. More specifically, the winding control unit 24 is configured to mechanically decelerate and drive the clothes winding roll at a predetermined ratio using the rotational movement of the loom main shaft as a driving source. As described above, the present invention also includes a warp control device in which the feed base speed is switched in response to the switching of the rotational speed of the loom main shaft.

In all the embodiments described above, the internal configurations of the transmission control unit 23, the winding control unit 24, the selection signal generation unit 30, and the like are not limited to the illustrated examples. Instead of configuring each control unit (the sending control unit 23 and the winding control unit 24) as a separate circuit, an integrated circuit configuration is also possible. In addition, the control of each unit may be processed by a computer and software instead of processing by a hardware circuit.

1 is a side view of a loom, in particular a warp path, for carrying out the method according to the invention. 3 is a block diagram of a warp control device according to Embodiment 1 and Embodiment 2. FIG. FIG. 4 is a timing chart of the operation according to the first embodiment. FIG. 10 is a timing chart of an operation according to the second embodiment. FIG. 10 is a block diagram of a delivery control unit in a warp control device according to Embodiment 3. FIG. 10 is a timing chart of an operation according to the third embodiment. FIG. 10 is a block diagram of a delivery control unit in a warp control device according to Embodiment 4; FIG. 10 is a timing chart of the operation according to the fourth embodiment. FIG. 10 is a block diagram of a delivery control unit in a warp control device according to Embodiment 5. FIG. 10 is a timing chart of an operation according to the fifth embodiment. It is a block diagram of the delivery control part in the warp control apparatus by Example 6 of this invention.

DESCRIPTION OF SYMBOLS 1 Loom 2 Warp 3 Warp beam 4 Back roll 5 綜 絖 6 筬 7 Opening 8 Woven cloth 9 Weaving 10 Weft 11 Guide roll 12 Press roll 13 Clothing roll 14 Press roll 15 Fabric winding beam 16 Spindle motor 17 Spindle 18 Opening device 19 Strike Motion conversion device 20 Sending motor 21 Winding motor 22 Warp control device 23 Sending control unit 24 Winding control unit 25 Driving unit 26 Driving unit 27 Spindle driving unit 28 Angle detector 29 Timing signal generator 30 Selection signal generating unit 31 Speed command Unit 32 Inverter 33 Winding base speed generating unit 34 Switch 35 Pulse generating unit 36 Forward / reverse counter 37 Current generating unit 38 Pulse generator 39 Tension control unit 40 Sending base speed generating unit 41 Speed signal generating unit 42 Switch 43 Pulse generating unit 44 Forward / Reverse Counter 45 Current Generator 46 Pulse Generator 47 Force sensor 48 Addition point 49 Reel diameter sensor 50 Correction unit 51 First base speed generation circuit 52 Second base speed generation circuit 53 Third base speed generation circuit 54 Switch 55 Sending base speed generating part 56 Sending base speed generation Unit 57 first base speed generation circuit 58 second base speed generation circuit 59 switch 60 base speed generation unit

Claims (1)

A plurality of rotation speeds of the main shaft (17) of the loom (1) after the steady operation are set in advance, and the rotation speed of the main shaft (17) is changed from the set one rotation speed to the other rotation speed in a predetermined change period. A warp control device (22) used in a loom (1) for changing the speed,
The warp control device (22) includes a winding control unit (24) that drives the clothing roll (13) in synchronization with the rotation of the main shaft (17), and a main shaft (detected every predetermined period during steady operation). A feed controller (23) for generating a basic speed based on the rotational speed of 17) and driving the warp beam (3) according to a correction result obtained by correcting the basic speed in a direction to cancel the tension deviation. In the warp control device (22) of the loom (1),
When changing the rotational speed of the main shaft (17), the sending control unit (23) is a first period determined to include at least a part of the predetermined change period, and the start point is the predetermined change. The rotation speed of the main shaft (17) continuously detected over a first period set to be before the first beat-up time in the period and every period shorter than the predetermined period during the steady operation And generating the basic speed proportional to the rotational speed of the main shaft (17) at each detection.

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