JP2670808B2 - Control device for drum type weft measuring and storing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a drum type weft measuring and storing device in which a yarn guide or a drum is driven by a feed motor, and wefts are wound on the drum and measured and stored.

2. Description of the Related Art A drum type weft measuring and storing device (hereinafter, simply referred to as a storing device) widely used in a jet loom or the like is roughly classified into a stationary drum type and a rotating drum type. The former is a type in which the weft yarn is wound around the drum by rotating the yarn guide around the stationary drum, and the latter is the one in which the weft yarn is fed while passing through the stationary yarn guide while rotating. The weft is wound around the drum. Generally, since the yarn guide can be made lighter than the drum, the former is more responsive than the latter and is suitable for high speed driving.

On the other hand, both of these types require a drive source for rotationally driving the yarn guide or drum,
In order to cope with the recent increase in the speed of the loom, it is possible to obtain much higher performance by providing an independent feed motor than by driving the loom main shaft through a power transmission mechanism such as a belt. In addition, it is possible to easily adapt to requests for various driving patterns when inserting multicolor wefts.

The control device of the storage device having such a feed motor controls the number of rotations of the feed motor so that the amount of wefts stored on the drum, that is, the weft storage amount is always maintained at an optimum amount that matches the rotation speed of the loom. Stable control is essential. Therefore, the applicant determines whether the drive control unit that controls the rotation of the feed motor based on a constant reference speed signal and whether the current rotation speed of the feed motor matches the rotation speed of the loom, and A control device that combines with the correction control unit that corrects the former excess or deficiency has been previously proposed (Japanese Patent Laid-Open No. 61-266639).

This device can improve the stability of the entire operation by limiting the operation area of the correction control unit to a correction operation in a narrow range corresponding to the deviation from the required rotation speed of the feed motor.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention According to such a conventional technique, since the reference speed signal that gives the base speed of the feed motor in the drive control unit has a constant value set through the manually operated setter, the loom rotation If the number fluctuates significantly during operation,
It was sometimes difficult to achieve the expected performance.
In other words, if the number of revolutions of the loom is always maintained at a preset constant value, it is sufficient to fix the reference speed signal so as to correspond to this constant value. In the case of optimally controlling the rotation speed of the loom online based on the evaluation results such as, or when the rotation speed of the loom fluctuates significantly due to load fluctuation of the loom accompanying switching of shed patterns, the reference speed signal is If fixedly set, the operation region of the correction control unit cannot be limited to a predetermined narrow range, and it becomes impossible to maintain a desired stable operation.

Therefore, in view of the situation of the prior art, an object of the present invention is to make the reference speed signal to be fed to the feed motor from a rotation speed signal indicating the rotation speed of the loom, thereby changing the rotation speed of the loom from time to time. Another object of the present invention is to provide a control device for a drum type weft measuring and storing device that can sufficiently maintain the stability of the entire operation.

Means for Solving the Problems The configuration of the first invention according to the present application for achieving the above-mentioned object includes an arithmetic unit for converting a rotation speed signal indicating a rotation speed of a loom to generate a reference speed signal, and an arithmetic unit. A control amplifier for controlling the speed of the feed motor by the reference speed signal of
A correction control unit for correcting the excess or deficiency of the rotation speed of the feed motor is provided, and the correction control unit detects the difference between the rotation amount of the feed motor and the required rotation amount of the feed motor based on the rotation speed signal. The gist is to output a correction signal for correcting the reference speed signal.

The gist of the configuration of the second invention is that in the first invention, the correction controller outputs a correction signal for correcting the reference speed signal based on whether the weft storage amount on the drum is excessive or insufficient.

The rotation speed signal can be obtained from a rotation sensor that detects the rotation of the main shaft of the loom, or can be branched from the rotation speed command signal for the main motor of the loom.

Operation According to the structure of the first aspect of the invention, the reference speed signal that gives the base speed of the feed motor is obtained by converting from the rotation speed signal that indicates the rotation speed of the loom, and always follows the rotation speed of the loom. Therefore, the correction control unit detects the difference between the actual rotation amount of the feed motor whose speed is controlled so as to follow the rotation speed of the loom and the required rotation amount based on the rotation speed signal, The correction control area can be limited to a narrow predetermined range. This is because the actual rotation amount and the required rotation amount of the feed motor are controlled and calculated on the basis of the common rotation speed signal, so that the difference between the two is guaranteed to remain within a predetermined small range.

The correction control unit of the second aspect of the invention can operate similarly to that of the first aspect of the invention by outputting a correction signal based on whether the weft storage amount on the drum is excessive or insufficient. This is because the excess or deficiency of the weft storage amount directly corresponds to the difference between the actual rotation amount of the feed motor and the required rotation amount.

The rotation speed signal can be detected directly from the rotation sensor by directly detecting the rotation speed of the loom, while the rotation speed signal can be branched from the rotation speed command signal for the main motor. Can be matched. This is because the rotation speed of the loom is controlled so as to follow the rotation speed command signal.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

The control device 10 of the drum type weft length measuring and storing device includes the arithmetic unit 1
1, the control amplifier 14, the correction control unit 20 and the main components (Fig. 1).

The storage device D includes a stationary drum D1 and a yarn guide D2 that rotates around the drum D1 and winds the weft Y on the drum D1. The yarn guide D2 is rotated by a dedicated feed motor D3. Being driven. Drum D1
Is provided with a lock pin D4, and the lock pin D4 moves back and forth with respect to the peripheral surface of the drum D1, and unwinds the weft Y.
Alternatively, the weft Y can be locked. On the other hand, the feed motor D3 is directly connected to the rotary encoder D5,
The rotary encoder D5 includes a drum D1, a feed motor D3
Can be output as a pulse signal.

The weft Y is unwound from the yarn feeder Y1 and is used as a yarn guide.
It is wound and stored on the drum D1 by the rotation of D2, and the locking pin D4 withdraws from the peripheral surface of the drum D1 at a predetermined weft insertion timing, so that it is wefted into a locking opening (not shown) by the nozzle Y2.

The calculator 11 has a rotation sensor SR directly connected to the main shaft M1 of the loom.
The rotation speed signal SL from is input. The loom is a main motor M fed from a power source AC via a main motor controller MC.
Driven by, the rotation sensor SR can output a rotation speed signal SL indicating the rotation speed of the loom as a pulse signal in accordance with the rotation of the main shaft M1. The main motor controller MC
A rotation speed command signal SM is input to the computer from a computer system (not shown).

The rotation speed signal SL is converted into the reference speed signal SL1 via the arithmetic unit 11 and the DA converter 12, and is input to the addition terminal of the addition point 13. The output of the addition point 13 is connected to the feed motor D3 of the storage device D via the control amplifier 14.

The correction control unit 20 includes a frequency divider 21, a counter 22, a DA converter 23.
It is configured by cascading. That is, the rotation speed signal SL
Is branched and input to the frequency divider 21, and the output of the frequency divider 21 is connected to the up input terminal U of the counter 22.
Further, the down input terminal D of the counter 22 receives the rotation speed signal SD from the storage device D. The output of the counter 22 is connected to another addition terminal of the addition point 13 via the DA converter 23.

 The operation of the control device 10 is as follows.

Now, the rotation sensor SR outputs a rotation speed signal SL consisting of nL pulses per rotation of the spindle M1, and the rotary encoder D5 outputs a rotation speed signal SD consisting of nD pulses per rotation of the feed motor D3. It shall be output. Also,
The frequency divider 21 sets the required length of the weft Y for one pick to the drum D1.
The dividing ratio a is set so that mnD = nL / a for the above m turns.

The arithmetic unit 11 measures the pulse rate f of the rotation speed signal SL / second, and based on this, the current loom rotation speed R = 60f / nL
(Rpm), and the required rotation speed RD of the feed motor D3
Then, RD = mR-60mf / nL (rpm) is calculated, and this is digitally output. Therefore, the DA converter 12 converts the output of the arithmetic unit 11 into an analog signal to obtain the reference speed signal SL1.
As a result, the required rotation speed RD of the feed motor D3 can be obtained. That is, the calculator 11 can convert the rotation speed signal SL and generate the reference speed signal SL1 via the DA converter 12.

The feed motor D3 is speed-controlled via the control amplifier 14 based on the reference speed signal SL1. Further, the difference between the actual rotation amount of the feed motor D3 and the required rotation amount is corrected via the correction control unit 20.

That is, the counter 22 is required to be obtained by counting the actual rotation amount of the feed motor D3 obtained by counting the rotation speed signal SD and the rotation speed signal SL divided by the frequency divider 21. If there is a difference with the rotation amount, this is detected and the correction signal is sent via the DA converter 23.
It is output to the summing point 13 as Sc. At this time, the feed motor D3 is speed-controlled based on the reference speed signal SL1 calculated based on the rotation speed signal SL, and
The correction signal Sc is also based on the deviation between the required rotation amount based on the rotation speed signal SL and the actual rotation amount. Therefore, the correction signal Sc always stays within a predetermined small range regardless of the fluctuation of the rotation speed signal SL, and therefore, the rotation speed command signal SM given from a computer system (not shown) changes and the rotation speed of the loom changes. However, the correction control unit 20 always operates in a small correction range, and the feed motor D3 can be operated sufficiently stably.

In the above description, the control amplifier 14 can further improve its responsiveness by including the minor control system for feeding back the rotation speed of the feed motor D3. Further, since the frequency divider 21 considers the required length of the weft Y for one pick and associates the respective pulse rates of the rotary encoder D5 and the rotation sensor SR, the frequency divider 21 divides the frequency according to the required length of the weft Y. The ratio a can be arbitrarily variably set, or a divider may be used, and the ratio a may be interposed between the rotary encoder D5 and the counter 22. In the case of multicolor weft insertion, the frequency division ratio a of the frequency divider 21 is mnDnc / np = nL / a
It may be determined so that However, the drum at this time
The maximum storage amount of weft Y on D1 shall be determined in consideration of the required amount that can be applied to the number of picks to be continuously inserted in one cycle nc pick.

Other Embodiments A pair of sensors S1 and S2 are provided to detect the weft yarn Y wound around the drum D1 of the storage device D (FIG. 2),
The correction controller 20 can be formed by a logic circuit operated by the outputs of the sensors S1 and S2. That is, the outputs of the sensors S1 and S2 are branched and connected to the NOR gate 24 and the AND gate 25, respectively, while the relays R1 and R2 are connected to the outputs of the NOR gate 24 and the AND gate 25, respectively. Further, two setters 26 and 27 are provided, and their outputs are connected to the addition terminal and the subtraction terminal of the addition point 13 through the normally open contacts R1a and R2a of the relays R1 and R2. Other configurations are the same as those in FIG.

When neither of the sensors S1 and S2 detects the weft yarn Y on the drum D1, the relay R1 operates via the NOR gate 24, and the acceleration control of the feed motor D3 is performed based on the correction signal Sc1 set by the setter 26. Be done. on the other hand,
When both the sensors S1 and S2 detect the weft Y, the deceleration control can be performed by the correction signal Sc2 set by the setter 27 via the AND gate 25 and the relay R2. Sensor S
Neither 1 nor S2 detects the weft Y
The storage amount of the weft Y above 1, that is, the weft storage amount is insufficient, and the fact that both the sensors S1 and S2 detect the weft Y indicates that the weft storage amount is excessive. At this time, the correction control unit 20 can output correction signals Sc1 and Sc2 for correcting the reference speed signal SL1 based on the excess or deficiency of the weft storage amount on the drum D1.

When the sensor S1 on the upstream side of the drum D1 detects the weft Y and the sensor S2 on the downstream side does not detect the weft Y, the weft storage amount is appropriate. Therefore, the control amplifier at this time
14 continues the speed control of the feed motor D3 by the reference speed signal SL1.

In the above description, the rotation speed signal SL is the rotation sensor S
Instead of actually measuring the rotation speed of the loom via R, the rotation speed command signal SM given from the computer system CP to the main motor control device MC may be branched and used (third embodiment).
Figure). The main motor M is controlled in rotation speed so as to follow the rotation speed command signal SM via the main motor control device MC, while there is a difference between the rotation speed of the main motor M and the rotation speed command signal SM. However, the correction control unit 20 can effectively guarantee that, and there is no hindrance to the entire operation.

The rotation speed command signal SM is sent to the computer system C.
Instead of giving from P, it may be set by a general manual setting device. Furthermore, the present invention is not limited to a stationary drum type storage device D that is a combination of a stationary drum D1 and a rotating yarn guide D2, but is also a rotating drum type in which a fixed yarn guide and a rotating drum are combined. It can be applied as it is to the storage device.

EFFECTS OF THE INVENTION As described above, according to the first aspect of the present application, an arithmetic unit that converts a rotation speed signal to generate a reference speed signal that gives a base speed of the feed motor and a feed motor using the reference speed signal are provided. By combining the control amplifier for speed control and the correction control unit, the difference between the actual rotation amount of the feed motor detected by the correction control unit and the required rotation amount and the correction signal output based on the difference are Even if the number fluctuates greatly, it always stays within a predetermined small range, and the operation area of the correction control unit can be limited to a narrow predetermined range, so the stability of the feed motor control operation is sufficiently high. Therefore, even when constructing a system in which the optimum rotation speed of the loom can be set at any time by the computer system,
There is an excellent effect that it is possible to effectively eliminate the risk of weft insertion troubles due to an improper rotation speed of the storage device.

According to the second aspect of the invention, the excess or deficiency of the weft storage amount on the drum detected by the correction control unit directly corresponds to the difference between the actual rotation amount of the feed motor and the required rotation amount.
The same effects as the invention can be realized.

[Brief description of the drawings]

FIG. 1 is an overall system explanatory diagram showing an embodiment. FIG. 2 is an explanatory diagram of a main part system showing another embodiment. FIG. 3 is an explanatory view of a main part system showing still another embodiment. Y ... Weft D ... Drum type weft measuring and storage device D1 ... Drum D3 ... Feed motor M ... Main motor M1 ... Spindle SR ... Rotation sensor SM ... Rotation speed command signal SL ... Rotation speed signal SL1 …… Reference speed signal Sc, Sc1, Sc2 …… Compensation signal 10 …… Control device 11 …… Computer 14 …… Control amplifier 20 …… Compensation control unit

Claims (4)

(57) [Claims] Claim: What is claimed is: 1. An arithmetic unit for converting a rotational speed signal indicating a rotational speed of a loom to generate a reference speed signal, a control amplifier for speed-controlling a feed motor by the reference speed signal from the arithmetic unit, and a rotation of the feed motor. And a correction control unit for correcting the excess or deficiency of the number of motors, the correction control unit detecting a difference between the rotation amount of the feed motor and the required rotation amount of the feed motor based on the rotation speed signal, and determining the reference speed. A control device for a drum type weft measuring and storing device, which outputs a correction signal for correcting the signal. 2. An arithmetic unit for converting a rotational speed signal indicating the rotational speed of the loom to generate a reference speed signal, a control amplifier for speed-controlling the feed motor by the reference speed signal from the arithmetic unit, and a rotation of the feed motor. A correction control unit for correcting the excess or deficiency of the number, and the correction control unit outputs a correction signal for correcting the reference speed signal based on the excess or deficiency of the weft storage amount on the drum. Control device of the drum type weft length measuring and storing device. 3. A control device for a drum type weft measuring and storing apparatus according to claim 1 or 2, wherein a rotation speed signal is obtained from a rotation sensor for detecting the rotation of the main shaft of the loom. 4. A control device for a drum type weft measuring and storing apparatus according to claim 1 or 2, wherein a rotation speed signal is branched from a rotation speed command signal for a main motor of the loom.