JPH0718074B2 - Weft supply device for multicolor loom - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a drum type weft yarn feeder for a multi-color weaving machine, and more particularly to a technique for controlling the rotational movement of a rotary yarn guide.

In addition, in this specification, in the case of multi-colored horizontal bags, "1 x
1), "1x2", "2x2", etc., the weft insertion method is defined regularly. The weft insertion method is called "constant exchange weft insertion", and the weft insertion order is irregularly defined. The horizontal weft insertion method is called "free exchange weft insertion".

Conventional technology This type of drum type weft yarn feeder draws out the weft yarn from the yarn feeder by the rotational movement of the rotary yarn guide and sequentially winds the weft yarn around the outer peripheral surface of the drum for measuring and storing in a stationary state, The weft thread of the length required for weft insertion of one pick or several picks is measured and stored. The weft thread is locked to the outer peripheral surface of the drum by a locking pin during length measurement, and is unwound from the drum by the retracting movement of the locking pin during weft insertion. At the time of this unwinding, the weft insertion nozzle injects the pressure fluid into the warp yarn opening, thereby inserting the length-measured weft yarn into the warp yarn opening together with the jetting fluid.

By the way, since the rotational movement of the rotary yarn guide and the forward / backward movement of the locking pin are synchronized with the main movement of the loom,
It is mechanically linked to the crankshaft of the loom.

However, as the rotational movement of the loom becomes faster, there is a limit to the mechanical follow-up speed of the drive mechanism for the locking pin, and there is a mechanical interlocking mechanism at the time of multicolor weft insertion. It will be difficult to select it. Such inconvenience
This can be solved by driving the rotary yarn guide with a dedicated feed motor without taking the drive source of the rotary yarn guide from the crankshaft of the loom. In such a type of weft supply device, drive control of the motor is required.

For example, in the invention of JP-A-59-204947, the winding amount of weft is optically detected on the drum for measuring and storing, and the on / off state of the feed motor is controlled according to the excess or deficiency. .

In this case, an overcurrent transiently flows through the feed motor due to the on / off control. In particular, in the multicolor weft insertion, the feed motor is on / off controlled in synchronization with the weft thread selection signal, so that, for example, during constant feed weft insertion, since an overcurrent frequently flows in the feed motor every on / off,
The feed motor heats up considerably, and there is a possibility of exceeding the usage limit of the motor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the heat generation of the feed motor in the multi-color loom by continuously rotating the feed motor at least during constant-loading.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention sets a rotation amount of a rotary yarn guide in accordance with a rotation amount of a main shaft of a multicolor loom, and actually sets the rotation amount of the rotary yarn guide based on the set rotation amount. The rotation of the feed motor is controlled following the operation of the loom by subtracting the amount of rotation of the feed motor, and the feed motor is turned on / off in synchronization with the weft thread selection signal at the time of freely changing the weft insertion. At the time of insertion, the feed motor is controlled in a continuous rotation state at an appropriate speed based on the operation signal of the loom.

Configuration of Embodiments The configuration of the present invention will be specifically described below based on the embodiments shown in the drawings.

First, FIG. 1 shows the command control unit 2 in relation to the mechanical components of the weft supply device 1 for one color of the multicolor loom of the present invention.
And connection relation of drive control unit 3 and state command control unit 2
It shows the internal configuration of the.

The weft yarn 4 is supplied by the yarn feeder 5, passes through the inside of the rotary yarn guide 6, and is wound around the outer peripheral surface of the length measurement storage drum 7 by the rotational movement thereof. The rotary drive source of the rotary yarn guide 6 is provided by, for example, a feed motor 8 attached to its shaft portion.

During the length measurement storage operation, the weft thread 4 is on the outer peripheral surface of the drum 7,
It is locked by the locking pin 9. This locking pin 9
Is supported by, for example, an electromagnetic solenoid 10 and is provided so as to be movable back and forth toward the outer peripheral surface of the drum 7. By retracting when wefting, the weft thread 4 in the stored state is unwound on the peripheral surface of the drum 7. . At this time, the unwound weft yarn 4 is put into the opening of the warp yarn together with the jet fluid by the weft insertion nozzle 11. Of course, the forward / backward movement of the locking pin 9 and the jetting operation of the weft insertion nozzle 11 are performed in synchronization with the rotation of the main shaft 12 of the multicolor loom.

During this time, the rotation of the spindle 12 is detected by the rotation detector 13 as a digital rotation signal A, passes through the contact 14,
The data is sent to the up input terminal 15a of the up / down type counter 15 as the arithmetic storage unit.

On the other hand, the rotation of the rotating yarn guide 6 is caused by the winding amount detector 16
And is sent to the down input terminal 15b of the counter 15 as a digital winding amount signal B.

Here, the counter 15 performs addition and subtraction between the pulse number of the winding amount signal B and the pulse number of the rotation signal A, generates the count value as a digital command signal C, and then performs the next D / A conversion. Bowl 1
After being converted into an analog command signal C'by 7, it is sent to the drive control unit 3. Counter 15, D / A
The converter 17 and the addition point 19 described later constitute the command signal generator of the present invention.

If four picks of weft yarn 4 are required on the drum 7 for one pick weft insertion, and the winding amount detector 16 generates a winding amount signal A of, for example, three pulses per one rotation of the rotary yarn guide 6. Then, the number of pulses for one pick is “12” for the winding amount signal B. On the other hand, if the rotation detector 13 generates a rotation signal A of a pulse of, for example, "60" per revolution of the main shaft 12 of the loom, and frequency is divided by the built-in frequency dividing means, for example, at a frequency division ratio of "5". A rotation signal A having a pulse number of "12" is input to the up input end 15a of the counter 15 per one rotation of the main shaft 12 of the loom.

At this time, the command signal C ′ is a voltage signal proportional to the count value of the counter 15. The command signal C ′ is input to the drive control unit 3 via the contact 18 and the addition point 19. On the other hand, the reference rotation signal D set by the reference rotation signal generator 20 is also added through the contact 21 at the combining point 19,
It is an input to the drive control unit 3. The reference rotation signal D corresponds to the reference rotation speed for constantly driving the feed motor 8 during constant replacement.

Therefore, the drive control unit 3 has at least a proportional operation function, performs integration and differentiation operations as necessary,
The sum of the command signal C'and the reference rotation signal D is amplified to generate the drive signal E, which drives the feed motor 8. Here, the drive signal E is converted into a voltage value of several times by the proportional operation of the drive control unit 3, and the feed motor 8 rotates the rotary yarn guide 6 at a high response speed.

In this way, when the count value of the counter 15, that is, the command signal C becomes "0", the voltage of the analog command signal C'becomes zero, so the drive control unit 3 causes the reference rotation signal D
The drive signal E is generated only by this, and the feed motor 8 is rotated at the reference rotation speed.

Furthermore, the down input exceeds the up input, and the counter 15
If the count value of N becomes negative, the voltage of the analog command signal C also becomes negative, so the drive control unit 3 determines that the reference rotation signal D
Amplifies a value smaller by the command signal C'to rotate the feed motor 8 at a speed lower than the reference rotation. In this way, four windings of weft yarn 4 corresponding to one pick per one rotation of the main shaft 12 of the loom are accurately stored on the drum 7.

Thus, when the reference rotation signal generator 20 is provided, the command control unit 2 controls only the reference rotation signal D, which corresponds to the excess or deficiency of the winding amount when the feed motor 8 is controlled. As a target, the drive control unit 3 is operated under a small control amount.
Will be corrected. Such control is effective in improving the response at the start of operation and stabilizing the control. Therefore, in this control mode, the feed motor 8 continuously rotates despite the intermittent weft insertion movement.

Furthermore, the contacts 14, 18, 21 are, as shown in FIG.
Relays 14A and 18 as drive circuits in the switching control unit 34
Operated by A and 21A. The relay 14A is connected to the output terminal of the AND gate 22 to which the loom operation signal F is input at one input end and the weft thread selection signal G is input at the other input end. The operation signal F of the loom is sent to the relay 18A.
Is entered directly. Further, the relay 21A is connected to the output terminal of the AND gate 23 to which the operation signal F of the loom is input at one input end, and the other input end of the AND gate 23 is connected via the changeover switch 24. Thus, the operation signal F of the loom or the weft yarn selection signal G is selectively input. In the case of this embodiment, the changeover switch 24 is a terminal a at the time of constant replacement and insertion by manual operation.
Is connected to the side of the operation signal F of the loom, and is switched to the terminal b to be connected to the side of the weft thread selection signal G when freely changing the weft insertion.

Operation of Embodiment Next, the operation of the embodiment of the present invention configured as described above will be described with reference to the time charts of FIGS. 3 and 4.

First, at the time of constant replacement, the changeover switch 24 is switched to the terminal a. As shown in FIG. 3, the operation signal F of the loom rises when the operation of the loom is started, and the weft thread selection signal G is turned on and off in a regular manner as shown, in synchronization with the selection of the weft thread 4. Therefore, the relays 18A, 21A are continuously energized during the operation of the loom, either directly or by the output of the AND gate 23, to set the contacts 18, 21 to the ON state. On the other hand, the relay 14A is energized by the output of the AND gate 22 in synchronization with the weft thread selection signal G, and controls the contact 14 on / off in synchronization with the weft thread selection signal G. Further, since the D / A converter 17 generates a command signal C'for correction with respect to the reference rotation speed of the feed motor 8, the drive control unit 3 receives the command signal (shown at the bottom of FIG. 3). Therefore, the feed motor 8 is continuously driven so as to smoothly pulsate about a substantially constant reference rotation speed without being controlled to be turned on and off in synchronization with the weft thread selection signal G. Will be done.

Next, at the time of freely changing and inserting, the changeover switch 24 is changed over to the terminal b. In this case, as shown in FIG.
The relay 18A is energized to turn on the contact 18 during the operation of the loom as in the case of the constant replacement weft insertion, but the relays 14A and 21A are
The outputs of the AND gates 22 and 23 energize in synchronization with the weft thread selection signal G, and the contacts 14 and 21 are controlled to be turned on / off in response to this. Therefore, the feed motor 8 is synchronized with the weft thread selection signal G and under the on / off control, the command signal (C ′).
+ D).

In this case, since the reference rotation speed of the feed motor 8 is different between the time of constant replacement and the time of free replacement, the voltage V0 of the reference rotation signal D at the time of constant replacement is freely changed. It is set to, for example, about 1/2 of the voltage V1 of the reference rotation signal D at the time of horizontal insertion.

Configuration and Operation of Other Embodiments FIGS. 5 and 6 show another embodiment of the weft supply device according to the present invention. In FIG. 5, the reference rotation signal generator 20
As a reference, two reference rotation signal generators 20a and 20b are provided, and these are selectively contacted by the changeover switch 25 to the contact 21.
Connected to. The reference rotation signal generators 20a and 20b are respectively the voltage of the reference rotation signal D1 at the time of constant replacement and insertion.
It is set so as to give V0 and the voltage V1 of the reference rotation signal D2 at the time of freely exchanging. Changeover switch 25
Is switched to the terminal a and connected to the reference rotation signal generator 20a side during constant replacement, and switched to the terminal b and connected to the reference rotation signal generator 20b side during free replacement.

Further, the changeover switches 24 and 25 are operated by the relay 26 of the changeover control unit 34, as shown in FIG. This relay 26 has an output port 28 of the weft selection device 27 of the loom.
From the driving direction switching signal H, for example, the switch 24 and the switching switch 25 are switched to the terminal a at the time of constant replacement insertion, and at the time of free replacement insertion,
It can be automatically switched to the terminal b side. In addition, the weft thread selecting device 27 uses the weft insertion pattern setting device 29 through the input port 30 and the central processing unit 31 to store the memory 32.
The weft insertion selection pattern stored in (1) is read by the timing signal generator 33 and the weft selection signal G, the driving method switching signal H and the like are output through the output port 28.

According to this configuration, the reference rotation signal generator 20 can be used in the case of changing from the constant exchange side insert to the free exchange side insert or vice versa.
You can easily make the above changes without having to re-set
It is possible to automatically switch the driving method of the feed motor 8 by pre-reading from.

Even in the weave pattern pattern in which the weft thread selection signal G from the weft thread selection device 27 is repeatedly turned on and off as frequently as during the constant exchange weft insertion during the free exchange weft insertion weaving pattern selection device 27. The weft insertion selection pattern stored in the memory 32 is read ahead, and the drive method of the feed motor 8 is automatically switched only during the period when a weave pattern pattern such as a constant exchange weft insertion appears, and at the same time, the reference rotation signal D
Switching between 1 and D2 can be done automatically.

Modifications of the Invention In each of the above-mentioned embodiments, the signal is controlled by the contact, but this may naturally be a contactless switch. Therefore, the relay is a contactless switch, for example, a drive circuit such as a switching transistor. It may be.

EFFECTS OF THE INVENTION As described above, according to the present invention, when the constant exchange weft is inserted, the reference rotation signal is output to the drive control unit in synchronization with the operation signal of the loom by the changeover switch, so that the feed motor responds to the operation signal. Since the feed motor is driven continuously, the feed motor slowly pulsates at an almost constant reference speed, and the on / off control does not cause a sudden rotation fluctuation.Therefore, an overcurrent does not flow to the feed motor. The heat generation of the feed motor is reduced. Also, since there is no sudden rotation fluctuation of the feed motor,
There is no adverse effect on the stored yarn. Further, when the freely exchangeable weft is inserted, the feed motor is intermittently driven according to the weft thread selection signal by outputting the reference rotation signal to the drive control section in synchronization with the weft thread selection signal by the changeover switch. It is possible to store only as many storage yarns as necessary in a given weft insertion cycle, and it is possible to minimize the amount of weft yarns stored on the drum. Therefore, the weft threads can be prevented from being entangled with each other on the drum, and stable weft insertion can be realized. In addition, in general, when inserting freely,
Since a woven pattern that frequently repeats selection and non-selection of weft threads rarely appears, the abrupt rotation fluctuation of the feed motor as described above does not become a serious problem.

Thus, according to the present invention, the constant exchange and the free exchange,
By operating the changeover switch, optimum rotation control can be easily realized for each.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a weft feed device according to the present invention, FIG. 2 is a block diagram of a control unit, and FIGS. 3 and 4 are for constant weft insertion and free insertion according to the embodiment of FIG. FIG. 5 is a block diagram of another embodiment of the present invention, and FIG. 6 is a block diagram showing a switching controller of the embodiment of FIG. DESCRIPTION OF SYMBOLS 1 ... Weft supply device, 2 ... Command control part, 3 ... Drive control part, 4 ... Weft, 5 ... Yarn supply body, 6 ... Rotating yarn guide,
7 ... Drum, 8 ... Feed motor, 9 ... Locking pin, 10 ...
Electromagnetic solenoid, 11 ... Weft insertion nozzle, 12 ... Loom spindle, 13 ... Rotation detector, 14 ... Contact, 15 ... Counter, 16 ... Winding amount detector, 17 ... D / A converter, 18 ... Contact, 19 ... Addition point, 20 ... Reference rotation signal generator, 21 ... Contact, 22, 23 ... AND gate, 24, 25 ... Changeover switch, 26 ... Relay, 27 ...
Weft thread selection device, 28 ... Output port, 29 ... Weft insertion pattern setting device, 30 ... Input port, 31 ... Central processing unit, 32 ... Memory, 33 ... Timing signal generator, 34 ... Switching control unit.

Claims (3)

[Claims] Claim: What is claimed is: 1. An outer peripheral surface of a measuring storage drum in a stationary state,
A weft supply device of a multicolor weaving machine that winds a weft yarn by rotating motion of a rotating yarn guide, measures the length, and stores until weft insertion, wherein the weft yarn supplying device supplies a rotating motion to the rotating yarn guide. , A feed motor command control unit, a drive control unit and a switching control unit, the command control unit generating a reference rotation signal corresponding to the reference rotation speed of the feed motor, a reference rotation signal generator, A rotation detector that detects the rotation of the main shaft, a winding amount detector that detects the winding amount of the weft yarn by the rotating yarn guide, a rotation signal from the rotation detector, and a winding amount signal from the winding amount detector. And a command signal generator that generates a command signal based on the value of the difference and sends the command signal to the drive control unit together with the reference rotation signal. The rotation signal from the rotation detector is output intermittently in synchronization with the weft thread selection signal, and the reference rotation signal from the reference rotation signal generator is continuously output based on the operation signal when the constant exchange weft insertion is performed. A weft supply device for a multi-color weaving machine, which intermittently outputs in synchronization with a weft selection signal when freely changing the weft. 2. The switching control section has a drive circuit for controlling a contact on the output side of the reference rotation signal generator, and the drive circuit receives an operation signal at one input end side thereof. And an output terminal of an AND gate to which the weft thread selection signal or the operation signal is selectively input to the other input end side through a switching means. No weft supply device. 3. The switching means comprises a pre-reading means for pre-reading the weft insertion selection pattern of the weft thread selecting device, and a change-over switch which is automatically switched on the basis of a signal from the pre-reading means. The weft supply device according to claim 2.