JPH0723575B2 - Method of controlling the feeding motor of the loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for controlling a warp yarn feeding movement, that is, a feeding motor, in an electric feeding device for a loom, and more particularly to a method for controlling the feeding motor during acceleration / deceleration of the loom.

2. Description of the Related Art Conventional technology and its problems Conventionally, as a delivery device of a loom, a mechanical device mechanically coupled to a main shaft has been used. In this mechanical system, the control of the warp yarn feeding is performed in synchronization with the main shaft, so that the control during acceleration / deceleration of the main motor has not been a problem.

However, in recent years, in order to improve the performance of the delivery device,
Electric feeding devices have begun to be used. In the electric feeding device, a motor such as a DC motor having a generally high response speed, which is completely independent of the main motor, is separately used to control the warp yarn feeding. Therefore, as indicated by the diagonal lines in FIG. 1, due to the difference in the acceleration / deceleration time due to the difference in the response speed of the main motor and the feed motor, the warp yarns are excessively fed at the time of start-up and the feed amount is insufficient at the time of stop. Induces the occurrence of a stop. It is possible to control the acceleration / deceleration time of the feed motor to be the same as that of the main motor, but to do so, a complicated device and a large capacity DC
Such a solution is not a viable solution because a motor is required.

OBJECT OF THE INVENTION An object of the present invention is to provide a feed motor control method that substantially eliminates over-feeding and under-feeding of warp yarns caused by a difference in acceleration / deceleration time between a main motor of a loom and a feeding motor in an electric feeding device. Is to provide.

Therefore, in the method of the present invention, as shown in FIG. 2, when the loom is accelerated, that is, when the loom is started, a start signal is given to the main motor, and then a first delay time preset by a timer has elapsed. At this time, when the first delay time elapses after the start command is given to the feed motor or the start command is given to the main motor at the time of acceleration of the loom, the start command is given to the feed motor and the loom is decelerated. When the second delay time preset by the timer elapses after the stop command is given to the main motor at the time of stop, the stop command is given to the feed motor so that the feed motor starts or synchronizes with the main motor. It is configured to stop. Further, in another embodiment of the present invention, instead of setting the first or second delay time with a timer, the above required time is determined by the timing of the rotation angle of the spindle.

Embodiments Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 3 shows an outline of an electric feed device 1 for a loom, which is a premise of the present invention. In the figure, the delivery motor 2 is a variable speed DC motor, and forcibly drives the delivery beam 4 through the gear 3 in the delivery direction of the warp yarn 5.

Then, the warp thread 5 passes from the delivery beam 4 through the tension roll 6, intersects with the weft thread 17 at the weave 7, and is driven by the reed 16 to become the woven fabric 8, the guide roll 9, the dressing roll 10, the press roll 11 After that, it is sequentially wound around the outer periphery of the cloth winding roll 12.

On the other hand, the rotation of the main motor 13 has been converted into a swinging motion, and is transmitted to the chamber 16, the clothing roll 10 via the gear 14, and the cloth winding roll 12 via the gear 15, respectively.

The tension roll 6 is provided with a tension detector 19 via a spring 18. The tension of the warp thread 5 detected by the tension detector 19 is averaged by the tension averaging circuit 20 and added as a tension feedback signal T.
It is sent to the PID control amplifier 23 via 22. The tension averaging circuit 20 is provided to average fluctuations in the tension value of the warp thread 5 due to the opening movement of the warp thread 5.

The above PID control amplifier 23 compares the tension setting signal Vi given by the tension setting device 21 with the tension feedback signal T, and generates the speed command signal Vo according to the difference. The speed command signal Vo output from the PID control amplifier 23
Is the normally open contact 35 of the post-operation relay 35 when the loom is started.
When a closes, it enters drive amplifier 25 from summing point 24. The drive amplifier 25 sends out a motor drive signal corresponding to the speed command signal Vo to the motor 2. The tacho generator 26 attached to the feed motor 2 detects the speed of the feed motor 2 as a speed feedback signal and feeds it back negatively to the addition point 24.

Next, FIG. 4 shows a control circuit 36 according to the method of the present invention, and FIG. 5 is a signal waveform diagram in each part of FIG.

In FIG. 4, electric power is supplied from the three-phase AC power supply 27 to the main motor 13 via the manual switch 28 and the contact 31a of the main relay 31, and further supplied to the control circuit 36 via the fuse 29. .

First, in order to start the operation of the loom, when the self-reset type start switch 30 is closed, the main relay 31 is excited, the normally open contact 31b is closed and self-holding, and the contact 31a is closed to close the main motor. Give a start command to 13. At this point, the main motor 13 starts immediately under the rising characteristic shown in FIG. At the same time, the normally open contact 31c of the main relay 31 closes and the normally closed contact 31d opens.

As a result, the start timer relay 32 is energized to start counting the first delay time T1, and the stop timer relay 34
Becomes inoperative. The start-up timer relay 32 is a normally-open contact when the preset first delay time T1 has elapsed in relation to the start-up characteristics of the main motor 13.
Close 32a. As a result, the relay 35 is excited, the normally open contacts 35a, 35b are closed and self-held, and a start command is given, so that the feed motor receives the speed command signal Vo via the contact 35a and rises up. Start up under the characteristics.

On the other hand, when the self-returning stop switch 33 is opened to stop the loom during operation of the loom, the main relay 31 is demagnetized to open its contacts 31a, 31b, 31c and close the contact 31d. At this time, the main motor 13 starts to decelerate due to its deceleration characteristic in association with a brake (not shown). At the same time, the stop timer relay 34 is energized to the second delay time.
Start counting T2. The stop timer relay 34 opens the normally-closed contact 34a to make the relay 35 in the demagnetized state when the second delay time T2 described above has elapsed. From this point, the feed motor 2 cuts off the supply of the speed command signal Vo and starts deceleration.

FIG. 2 shows the state of start and stop control of the feed motor 2 according to the present invention.

Normally, the first delay time T1 at the time of starting the feed motor 2
Is set so that the areas of two shaded areas surrounded by a line A1 representing the acceleration characteristic of the feed motor 2 and a line B1 parallel to the acceleration characteristic of the main motor 13 intersected with the same are equal in area. To be done. Similarly, the second delay time T2 when the delivery motor 2 is stopped is the line A2 representing the deceleration characteristic of the delivery motor 2 and the main motor drawn across the line A2.
The areas of the two shaded areas surrounded by the line B2 parallel to the deceleration characteristic of 13 are set to be equal. This equal volume relationship is determined by the main motor 13 when the main motor 13 having a gentle rising or falling characteristic reaches a steady speed after the start command or until it stops completely after the stop command. This corresponds to making the feed amount of the warp yarn 5 or the woven fabric 8 equal to the feed amount of the warp yarn 5 by the feed motor 2 therebetween. However, this delay time T
Depending on the type of fabric, 1 and T2 can be adjusted to unequal volume according to the tendency of thick or thin steps at the time of starting and stopping.

Other Embodiments Next, FIG. 6 shows an outline of a control circuit 36 for controlling the start and stop of the feed motor 2 by using the rotation angle of the main shaft of the loom as a parameter instead of the timer relay, FIG. 7 is a signal waveform diagram in each part of FIG.

In FIG. 6, similarly to the above-described embodiment, when a start command is given at the time of starting the loom, the main relay 31 closes the contact 31a to start the main motor 13 and the main relay 31 connected to the positive power source. The normally open contact 31e is closed, and at the same time the normally closed contact 31f is opened. This allows contact 31e and resistor
One input of AND gate 37 connected between 38 and
It goes to "H" level, and one input of the AND gate 40 connected between the contact 31f and the resistor 39 goes to "L" level.

On the other hand, the main shaft 41 that rotates in synchronization with the rotation of the main motor 13
After the main motor 13 is started, when the main shaft 41 rotates by an angle corresponding to a preset first delay time T1, an operation for starting the feed motor from the angular position as detected by the proximity switch 42 A child 43 is provided.

Therefore, when the proximity switch 42 detects the actuator 43 after the first delay time T1, the proximity switch 42 generates the pulse signal TM1. This output is supplied to the set input of the flip-flop 45 via the AND gate 37. At this time, flip-flop 45
Is set to "1" to generate an "H" level output. Therefore, the output of the inverter 46 becomes the "L" level, and the relay 35 connected to the positive power supply has the contact 35 of FIG.
close a. As a result, the delivery motor 2 is activated after the first delay time T1.

On the other hand, when the main relay 31 is demagnetized by the stop command when the loom is stopped, the main motor 13 is decelerated, the contact 31e is opened, and the contact 31f is closed. This makes contact
The output of 31e goes to "L" level, and the AND gate 37 is in a state where it cannot output the pulse signal TM1. Also, contact 31f
Output becomes "H" level, and the other input of the AND gate 40 is allowed to pass through. The main shaft 41 is also fed to an angular position that is detected by the proximity switch 47 when the main shaft 41 rotates by an angle corresponding to a preset second delay time T2 after the deceleration of the main motor 13 starts. An actuator 48 for stopping is provided. Proximity switch 47
Detects the actuator 48, outputs a pulse signal TM2,
Applied to the other input of AND gate 40. Then, the AND gate 40 supplies the "H" level output to the reset input of the flip-flop 45, so that the flip-flop 45 is reset to "0" and generates the "L" level output.
Therefore, the output of the inverter 46 becomes "H" level,
Relay 35 is de-energized. As a result, the contact 35a shown in FIG.
The feed motor 2 decelerates to the second delay time T2.
Start later.

As described above, in the present invention, the delivery motor is accelerated by delaying the main motor at the acceleration time point or the acceleration and deceleration time points by the preset delay times, respectively.
Since the deceleration is performed, the feed motor is started and stopped in synchronization with or in harmony with the main motor.Therefore, the warp yarn feed at the start caused by the difference in acceleration / deceleration time between the main motor and the feed motor is started. Past
Insufficient warp yarn feeding at the time of stoppage can be eliminated, and as a result, there is an effect that a new stop step is prevented from occurring. Moreover, in the present invention, since this operation is realized by a timer or a simple device that uses the timing of the rotation angle of the main shaft, it is easy to implement. Also, by adjusting the set time of the timer, if the delay time of the start and stop of the feed motor is adjusted according to the tendency of the thick and thin steps of the fabric, the stop stage will be generated depending on the type of fabric. It can be surely prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view of start / stop characteristics of a delivery motor according to a conventional method, FIG. 2 is an explanatory view of start / stop characteristics of a delivery motor according to the method of the present invention, and FIG. FIG. 4 is a schematic configuration diagram of a control circuit showing an embodiment of the present invention, FIG. 5 is a signal waveform diagram in each part of FIG. 4, FIG. 6 is a schematic configuration diagram of a modified example of the present invention,
FIG. 7 is a signal waveform diagram in each part of FIG. 1 ... Electric feeding device, 2 ... Feeding motor, 5 ...
… Warp thread, 13 …… Main motor, 32 …… Start timer relay, 34 …… Stop timer relay, 36 …… Control circuit, 41
…… Spindle.

Claims (2)

[Claims] 1. An electric feed device for a loom, which uses a motor independent of the main motor of the loom and has a faster response speed than the main motor as a warp yarn feed motor, and controls the feed amount of the warp yarn during acceleration of the loom. Acceleration characterized by starting the feed motor in synchronization with the main motor by giving a start command to the feed motor after a preset first delay time after giving a start command to the main motor Method for controlling the delivery motor of a loom during operation. 2. An electric feed device for a loom, which uses a motor independent of the main motor of the loom and has a faster response speed than the main motor as a warp yarn feed motor, and controls the feed amount of the warp yarn, when the loom is accelerated. After giving a start command to the main motor, give a start command to the feed motor with a delay of a preset first delay time, give a stop signal to the main motor when decelerating the loom, and then give a preset second Delayed by the delay time of
A feed motor control method for a loom during acceleration / deceleration, which starts and stops the feed motor in synchronization with a main motor by giving a stop signal to the feed motor.