JPS61266639A - Weft yarn supply apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a drum-type weft supply device, and more particularly to a technique for controlling the rotational movement of a rotating yarn guide.

Background of the Invention This type of drum-type weft supply device draws out the weft from the yarn supplying body through the rotational movement of a rotating yarn guide, and sequentially winds the weft around the outer circumferential surface of a length measurement storage drum in a stationary state. , measure and store the length of weft yarn required for one pick or several picks. The weft yarn is locked to the outer peripheral surface of the drum by a locking pin during length measurement, and is unwound by the backward movement of the locking pin during weft insertion. At this time of unwinding, the weft insertion nozzle injects pressurized fluid into the shed to insert the measured weft yarn into the unopened space.

By the way, in order to synchronize the rotational movement of the rotating yarn guide and the forward and backward movement of the locking bin with the main movement of the loom,
It is mechanically connected to the loom's crankshaft.

However, as the rotational speed of the loom increases, there is a limit to the mechanical follow-up speed, and it becomes difficult to freely select the weft insertion when inserting multiple colors. Such inconveniences can be solved by driving the rotating yarn guide with a dedicated feed motor instead of using the crankshaft of the loom as the drive source for the rotating yarn guide. In this type of weft supply device, it is necessary to control the drive of the motor.

Prior Art For example, the invention disclosed in Japanese Patent Application Laid-open No. 59-204947 optically detects the amount of winding of the weft yarn on a drum for length measurement and storage.
The on/off state of the feed motor is controlled depending on the excess or deficiency.

By the way, the weft insertion conditions of the weft yarn can be improved by reducing the amount of weft yarn stored on the drum. However, if the storage amount of weft yarn on the drum is set to a small value, the feed motor must frequently turn on and off in response to the weft insertion operation, and this on/off operation not only has a negative effect on the motor itself, but also causes the weft yarn to wind. Attachment makes the situation unstable.

Meanwhile, such frequent on-off status of the feed motor can be solved by increasing the number of weft yarn storage picks on the drum. However, when the amount of stored weft yarn exceeds 1 bit, a complicated separation mechanism is required to separate the stored weft yarn every turn on the drum in order to prevent the weft yarn from becoming entangled. Such a separation mechanism is
In addition to complicating the weft supply device, this also places a load on the feed motor, causing the feed motor to become larger.

Furthermore, when an optical sensor is used to detect the position of the weft thread on the drum, the sensor may operate unstable depending on the type of thread. Further, when a mechanical lever type sensor is used, the tension of the weft yarn increases when the weft yarn is unwound, so that the weft insertion state tends to become unstable.

For example, the invention disclosed in Japanese Patent Application Laid-Open No. 58-31145 uses a pulse motor as a feed motor, sends a pulse of the length necessary for feeding the pulse motor, and sets the rotation amount by pulse control of an oven loop. are doing.

However, because the response speed of pulse motors is slow, pulse motors are not suitable for high-speed looms such as fluid injection looms, and if a drive pulse is sent that exceeds the response speed, it will cause a step-out phenomenon, making it impossible to operate. prone to the condition.

OBJECTS OF THE INVENTION Therefore, the first object of the present invention is to measure the amount of stored weft yarn, that is, the amount of winding, on the drum for length measurement and storage in relation to the amount of rotation of the rotating yarn guide and the amount of rotation of the loom. The goal is to be able to measure accurately.

The second purpose is to accurately measure the amount of winding of the weft yarn, and then to accurately control the amount of rotation of the feed mode and evening based on the measured excess or deficiency, and to increase the response speed. It is to increase the objective.

A third object is to enable the rotational movement of the rotary yarn guide to be easily changed by electrical means in accordance with the skip amount during multi-color weft insertion.

Structure of the Invention Therefore, the present invention compares the rotation amount of the rotating yarn guide with the signal from the rotation amount of the loom using an arithmetic storage unit that subtracts the rotation amount, and converts the rotation amount of the feed motor into a command signal based on the difference. I try to control it.

On the other hand, the rotation amount of the feed motor is negatively fed back to the input end side of the control driver as a feedback signal by a rotation amount detector and an F/V converter in the drive control section, or by a tacho generator in place of these. . Therefore, the feed motor is rotated at a high response speed by this feedback control system, and provides an appropriate rotational motion for storing the weft yarn in the rotating yarn guide.

Further, the amount of rotation of the loom is detected by a rotation detector in the command control unit, and the rotation signal is sent through a divider or a frequency divider as necessary.

Here, this frequency divider divides the loom rotation signal by a predetermined frequency division ratio, thereby transmitting a command signal corresponding to one bit of the loom rotation signal input to the calculation storage unit to the feed motor rotation. Since the signal is made to match the command signal corresponding to one bit, the number of windings for one bit can be easily changed by electrical operation.

Moreover, the amount of weft yarn accumulated on the drum is detected as an electrical signal based on the relationship between the amount of rotation of the loom and the amount of rotation of the rotating yarn guide, that is, the amount of rotation of the feed motor that drives it, which is different from conventional optical methods. Compared to detection means using sensors, there is no malfunction and its reliability is increased.

In addition, the proportional control and feedback control system of the drive control section increases the response speed of the feed motor as much as possible, so the amount of weft yarn stored on the drum is reduced, which reduces the possibility of intertwining of yarns on the drum. There is no need for a separating mechanism to separate the weft yarns for each weft.

EXAMPLE Hereinafter, the structure and operation of an example of the present invention will be specifically explained based on the drawings.

First, FIGS. 1 and 2 show a weft feeding device 1 of the present invention.
The interior of the command control section 2 and the drive control section 3 is shown in relation to the mechanical components thereof.

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

During the length measurement operation, the weft thread 4 is locked on the outer peripheral surface of the drum 7 by a locking pin 9. This locking bin 9 is provided so as to be able to move forward and backward toward the outer circumferential surface of the drum 7 by, for example, an electromagnetic solenoid 10, and by moving backward during wefting, the weft yarn 4 in the stored state is moved around the circumferential surface of the drum 7. Unwrap.

At this time, the unraveled weft yarn 4 is passed through the weft insertion nozzle 11
is inserted into the opening of the warp threads together with the jet fluid. Of course, the forward and backward movement of the locking bin 10 and the jetting operation of the weft insertion nozzle 11 are performed in synchronization with the rotation of the loom.

The rotation of the rotating yarn guide 60 is detected by the rotation amount detector 12 and sent as a digital rotation amount signal A to the down input terminal of the up-down type counter 13. On the other hand, the rotation of the main shaft 14 of the loom is detected by the rotation detector 15 as a digital rotation signal B, and the rotation is detected by the frequency divider 16. It is sent to the up input terminal of the counter 13 through the operation contact 17. In addition, operation contact 17
is set to the on state by the loom control device while the loom is operating.

Here, the counter 13 performs addition and subtraction between the number of pulses of the rotation amount signal A and the number of pulses of the rotation signal B, generates the counted value as a digital command signal C, and outputs the counted value as a digital command signal C. The D/A converter 18 converts the command signal C into an analog command signal C, and then sends this to the drive control section 3.

Here, if 1 pick requires 4 turns of weft yarn 4, and if the rotation amount detector 12 generates a rotation amount signal A of, for example, 3 pulses per rotation of the rotating yarn guide 6, then 1 pick requires The number of pulses is "12". on the other hand,
The rotation detector 15 generates a rotation signal B of, for example, 60 pulses per revolution of the main shaft 14 of the loom, and the frequency divider 1
6 is set to the dividing ratio "5" by the setter 19, the rotation counter 13 of the main shaft 1401 of the loom
A rotation signal B of 12 pulses is input to the up input terminal of the motor.

At this time, the command signal C' is a voltage signal proportional to the count value of the counter 13.

Then, this command signal C' becomes an input to the control driver 21 via a changeover switch 25 and a summing point 20 inside the drive control section 3. On the other hand, the reference signal F set by the reference setter 23 is also input to the control driver 21 via the selection contact 24 and the summing point 20 . This control driver 21 has at least a proportional operation function, performs integral and differential operations as necessary, amplifies the command signal C and reference signal F, generates a drive signal, and thereby feeds Drive the motor 8. Here, the drive signal is converted into a voltage value several times larger by the proportional operation of the control driver 21, and the feed motor 8 rotates the rotary yarn guide 6 at a fast response speed. At the same time, the rotation amount detector 12 generates a rotation amount signal A and sends it to the down input terminal of the counter 13. In this way, when the count value of the counter 13, that is, the command signal C reaches rOJ, the voltage of the analog command signal C' becomes zero, so
The control driver 21 generates a drive signal using only the reference signal F and causes the feed motor 8 to rotate.

Conversely, the down input exceeds the up input, and counter 13
When the count value becomes negative, the voltage of the analog command signal C also becomes negative, so the drive controller 21 amplifies a value smaller than the reference signal F by C' and rotates the feed motor 8. In this way, four turns of weft yarn 4 corresponding to one pick are accurately stored on the drum 7 per revolution of the loom.

In such a control process, the F/V converter 22 converts the pulsed rotation amount signal A from the rotation amount detector 12 into a voltage value, and sends this as a speed feedback signal E to the summing point 20 as a negative feedback. I'm letting you do it.

This speed feedback signal E is transmitted to the control driver 21
Together with this, it constitutes a speed feedback control system.
This is effective in increasing the response speed of the feed motor 8 and preventing excessive control.

On the other hand, the drive control section 3 is provided with a reference setting device 23 as required. This reference setter 23 is connected to the selection contact 2
4 is on, the reference signal F is added to the point 20.
to be applied. This reference signal F is applied to the feed motor 8.
By applying a voltage corresponding to the reference rotation speed,
The feed motor 8 is always rotated at a predetermined speed. Therefore, the command control unit 2 controls only the portion corresponding to the excess or deficiency of the reference signal F, and controls the control driver 21 in a corrective manner based on a small control amount. This is effective in improving the reaction at the start of operation.

By the way, when this weft supply device 1 is used for multicolor weft insertion, the frequency divider 16 divides the frequency of the rotation signal B according to the number of jumps using the frequency division ratio set by the setting device 19. You can also do that. For this reason, the jump control during multi-color horizontal insertion is performed using the setting value (dividing ratio) of the setting device 19.
It can be changed by simple electrical operation by adjusting .

Note that such a frequency divider 16 may be interposed in the transmission path of the rotation amount signal A. Further, a divider may be used instead of the frequency divider 16.

Also, when the loom stops, the changeover switch 25
The control device of the loom switches the operation contact 25a to the stop contact 2.
It can be switched to 5b. As a result, the control driver 21
Since the input side of is connected to the zero potential 32 and immediately set to zero potential, the drive controller 21 is disconnected from the command signal C' and immediately stops the feed motor 8. Further, when the loom is stopped, the operating contact 17 and the selection contact 24 are set to the OFF state by the loom control device, so when the loom is running in reverse or inching, the command control unit 2 and the drive control unit 3 is set to an inactive state.

The drive control unit 3 also includes a pre-winding controller 26 for pre-winding a required number of picks of weft yarn 4 around the outer peripheral surface of the drum 7 while the loom is stopped.

This preliminary winding controller 26 receives the rotation amount signal A from the rotation amount detector 12 as an input signal, and applies the command signal G as its output to the summing point 20 .

The internal configuration of this pre-winding controller 26 is shown in FIG. That is, the signal G at the time of preliminary winding is the rotation setting device 2.
7 and sent to summing point 20 via relay contact 28. On the other hand, the amount of winding (number of picks) required for the preliminary winding is set by the preliminary winding setting device 29 and given to one input terminal of the preset counter 30 . Therefore, upon receiving the preliminary winding command signal H, the preset counter 30 drives the relay 31 to turn on the relay contact 28. As a result, the control driver 21 rotates the feed motor 8 at the rotational speed given by the preliminary winding rotation signal G, and causes the rotating yarn guide 6 to sequentially wind the weft yarn 4 around the outer peripheral surface of the drum 7.

During this time, the rotation amount signal A is input to the preset counter 30 as a signal for subtraction. When the count value of the preset counter 30 reaches "0", the preset counter 30 demagnetizes the relay 31 and sets the relay contact 28 to the OFF state. In this way, the weft thread 4 necessary for pre-winding is automatically stored on the outer peripheral surface of the drum 7.

Modifications of the Invention In the above embodiment, the frequency divider 16 or the divider is interposed inside the command control unit 2, thereby providing for jump control during multicolor horizontal input. Further, the operation contact 17 inside the command control section 2 can be replaced by a weft thread selection signal from a multi-color selection device.

Further, in the above embodiment, if the stored weft yarn 4 is unwound from the drum 7 for some reason while the loom is stopped, the pre-winding controller 26 is used to pre-wind a certain amount. However, since the number of windings may not be constant with this, a known sensor is provided to detect the number of turns unwound from the drum 7, and this signal is sent to the set value input terminal of the preset counter 30 or the input of the counter 13. The missing weft thread 4 may be replenished by inputting it at the end. In the former case, when the preliminary winding command signal H is received, preliminary winding is performed according to the number of turns of the unwound weft yarn 4. In the latter case, for example, when receiving a loom start command signal, the feed motor 8 rotates at a higher speed than usual in accordance with the count value of the counter 13.

Further, in the above embodiment, a speed feedback control system is configured by the rotation amount detector 12 and the F/V converter 22, but these are replaced by means for generating a voltage proportional to the rotation speed, such as a tacho generator. May be replaced.

In the above embodiment, the calculation storage section is composed of an up/down type counter 13, but this part is replaced by the rotation amount detector 12.
and the signals from the rotation detector 15 are counted. A counter may be provided for each, and the difference between the counts may be calculated by a comparison circuit, and this may be used as an electrical command signal. Furthermore, the functions described above can be realized by replacing each functional part with a microcomputer.

Effect of the invention The present invention provides the following unique effects.

First, the command and control unit uses electrical command signals to determine the amount of weft yarn stored on the drum from the amount of rotation of the main shaft of the loom and the amount of rotation of the feed motor, so the amount of stored weft yarn can be detected accurately. Since conventional optical sensors are not used in the detection process, stable detection is possible for any type of yarn, and malfunctions caused by external light or fluff are avoided. It can definitely be prevented.

As a result, a stable length measurement storage operation can be expected, and the horizontal insertion operation becomes stable.

Furthermore, since the drive control section includes a proportional control operation and a speed feedback control system, the response speed of the feed motor becomes faster. Therefore, when the loom is rotating at a high speed or when the loom is started, the amount of weft yarn stored can be as small as 2 to 3 picks. Therefore, a complicated mechanism such as a stored yarn separator is not required, and the weft insertion is stabilized by reducing the resistance to pulling out the weft yarn. Furthermore, since the amount of yarn stored is small, it is possible to prevent yarns from becoming entangled with each other on the drum. Furthermore, since such a separator is not provided, the path of the weft yarn from the yarn feeding side to the nozzle side becomes smaller, and as a result, the pull-out resistance of the weft yarn can be reduced, and therefore the burden on the weft insertion nozzle can be reduced. Furthermore, the present invention has much better high-speed response than conventional motors using pulse motors.

[Brief explanation of drawings]

1 and 2 are block diagrams of the weft supply device of the present invention, and FIG. 3 is a block diagram of the pre-winding controller. 1. Weft supply device, 2. Command control unit, 3. Drive control unit, 4. Weft, 5. Yarn feeder, 6. Rotating yarn guide, 7. Drum, 8. Feed. motor, 9
... Locking bottle, 11 ... Weft insertion nozzle, 12 ... Rotation amount detector, 13 ... Counter, 14 ... Main shaft of the loom, 1
5... Rotation detector, 16... Frequency divider, 21... Control driver, 22... F/V converter, 26... Pre-winding controller, 30... Preset counter. 117Figure 2

Claims (9)

[Claims] (1) Measure the length by winding the weft yarn around the outer peripheral surface of the length measurement storage drum in a stationary state by the rotational movement of the rotating yarn guide,
A weft yarn supplying device that stores the weft yarn until the time of weft insertion,
This weft supply device includes a feed motor that provides rotational motion to the rotating yarn guide, a command control section of the feed motor, and a drive control section, and the command control section includes:
A rotation detector that detects the rotation of the loom, a rotation amount detector that detects the rotation amount of the feed motor, and an operation that adds the rotation signals from the rotation detector and subtracts the rotation amount signal from the rotation amount detector. A weft supply device comprising: a storage section; and a command signal generator that converts the value of the calculation storage section into a command signal and sends the command signal to the drive control section. (2) The command control unit includes a divider or a frequency divider that divides or divides the rotation signal from the rotation detector according to the amount of winding for one pick, and sends the result to the calculation storage unit. A weft yarn feeding device according to claim 1. (3) A patent claim characterized in that the calculation storage unit has an up-down counter that receives a rotation signal from the rotation detector as an up input and receives a rotation amount signal from the rotation amount detector as a down input. The weft feeding device according to item 1. (4) The drive control unit includes a control driver that drives the feed motor at least in a proportional operation based on a command signal from the command control unit. Weft feeding device. (5) The drive control section is on the input side of the control driver,
4. The weft yarn feeding device according to claim 3, further comprising a reference setting device that applies a voltage corresponding to the reference rotation speed of the rotating yarn guide. (6) The drive control section has an F/V converter that converts the rotation amount signal from the rotation amount detector into a voltage value and provides negative feedback to the input side of the control driver. The weft feeding device according to scope 3. (7) The weft yarn feeding device according to claim 3, wherein the drive control section has a changeover switch that connects the input side of the drive controller to zero potential when the loom is stopped. (8) The weft supply device according to claim 3, wherein the drive control section includes a preliminary winding controller that rotates the feed motor by a predetermined amount when the loom is stopped. (9) A patent claim characterized in that the command signal generator has a D/A converter that converts the value of the calculation storage section from a digital quantity to an analog quantity command signal and sends it to the drive control section. The weft feeding device according to item 1.