JPS591729A - Method for restarting spinning machine and apparatus therefor - Google Patents

Abstract

PURPOSE:To prevent the yarn breakage in restarting a spinning machine, by suddenly rotating spindles in restarting a motor in the spinning machine, tightly stretching relaxed yarns, operating the motor in the inertial rotation, starting the main motor, and accelerating the rotation of the spindles to the normal motion. CONSTITUTION:In stopping a spinning machine, yarns passing through front rolls to spindles are relaxed to cause snarls by all means. In restarting a motor (M) of the spinning machine, mans for directly starting the motor (M) driving and rotating the spindles, e.g. a pushbutton switch (PB1) for start-up, an auxiliary relay (CR1) and a solenoid contactor (MS1) for driving the motor (M), are operated to rotate suddenly the motor (M) and spindles, and yarns in the relaxed condition are tightly stretched. The motor (M) is directly subjected to the inertial rotation with a power source cutoff means (TR1), and then driven with a power source connecting means (TR2) before the rotation of the motor (M) is stopped. Thus, the motor (M) is transferred to the normal motion.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a restart method and apparatus for a spinning machine such as a ring spinning machine or a ring twisting machine.

BACKGROUND ART In general, in spinning machines such as ring spinning machines and ring twisting machines, when the machine is stopped, the threads between the front roller of the spinning machine and the Snell wire and from the Snell wire to the spindle base via the traveler become slack or become snarled.

As a result, the traveler riding on the ring will stop in an arbitrary position different from the normal gliding position. Moreover, many yarn breakages occur when restarting after doffing or after a mid-way stop during tube yarn formation.

Conventionally, it has been thought that if a sudden change in spinning tension is applied at startup, the traveler may follow the rotation of the spindle, and that the tension applied to the yarn will exceed the strength of the yarn and cause the yarn to break. If the main motor is actually suddenly started using the direct-starting method and the spindle rotational speed is suddenly increased to the normal operating rotational speed (11,000 to 14.00Or, 1+J), many thread breakages occur. In order to improve these shortcomings, methods have been adopted, such as a slow startup method using a reactor, and a method that uses a variable speed motor to operate at a speed of 50 to 70% of the normal operating speed for a certain period of time, and then shift to the normal operating speed. .

In the former slow startup method, as shown in Fig. 1, one line of the three-phase wiring connected to the motor M is connected to the reactor
A parallel circuit with the normally open contact M82 of the reactor short circuit electromagnetic contactor MS2 is connected in series. Then, when the starting push button switch PB1 is pressed during restart, the electromagnetic contact 6 for motor drive is activated.
M81 is energized and self-held, and motor M is slowly started by the current flowing through reactor X. At the same time as motor M starts, cushion time timer TR1'
starts counting, and the time amplifier energizes the reactor short circuit electromagnetic contactor MS2, and its normally open contact MS
2 closes. Then, the reactor X is short-circuited, the motor M is started directly, and the rotational speed increases to the normal operating speed.

However, with this slow startup method such as reactor startup, the traveling posture of the traveler may be poor immediately after startup, resulting in the balloon collapsing and the thread breaking, or the traveler not sliding smoothly and causing tension on the thread. There was an inconvenience that the threads became too strong and the threads broke.

Purpose This invention was made in order to eliminate the above-mentioned conventional defects, and its purpose is to eliminate yarn breakage when restarting after doffing or after stopping halfway, without using a reactor, variable speed motor, etc. It is an object of the present invention to provide a method and device for restarting a spinning machine, which can shift the rotational speed of a spindle to a normal operating rotational speed without causing any trouble.

EXAMPLE An example embodying the present invention will be described below with reference to FIGS. 2 to 4. The control circuit that controls the drive of the motor M is the second one.
As shown in the figure, the same power source as that of the motor M is used as the operating power source. The operating power supply includes a normally closed stop pushbutton switch FB,2 and a normally open start pushbutton switch FB1.
1. Normally closed contact OL1 of the protective relay OLI inserted in series with the two-phase line of the three-phase lines connected to the motor M;
- A circuit in which the normally closed contact TR of the next drive time setting timer TR1 and the motor drive electromagnetic contactor MS1 are connected in series is connected. The series circuit between the normally closed contact TR of the timer T1 and the motor drive electromagnetic contactor M81 includes an auxiliary relay C1, a next start time setting timer T1, and a normally open contact T of the timer TRI. The series circuits of the timer TR2 and the secondary start time setting timer TR2 are connected in parallel. In addition, the starting push button switch PB1 is connected to the auxiliary relay 0.
1 (1 normally open contact CI (1) is connected in parallel, and the normally open contact T2 of the secondary start time setting timer TR2 is connected in parallel to the normally closed contact T1 of the timer T1). ing.

Now, when you press the starting push button switch FBI when restarting after doffing or stopping halfway, the motor drive electromagnetic contactor M
81 and auxiliary relay C1 are energized, and their normally open contacts M
S, closes, the normally open contact OR, closes, the auxiliary relay OR1 is self-held, and the motor M is started directly. At the same time, the primary activation time setting timer Ti1l starts counting. Direct startup of motor M causes the spindle to rotate rapidly, which causes it to sag when the machine is stopped.
A sudden increase in tension is applied to the snarled thread, and the traveler, which was resting in an arbitrary position on the ring, is woken up and quickly guided to a normal gliding position.

In Fig. 4, the rotation speed of the spindle is approximately 5.00 Or, 11.111.
At the point when the above-mentioned - next startup clear setting timer T R1 is reached,
is time-amplified, the normally closed contact TR1 is opened, the motor drive electromagnetic contactor MSi is demagnetized, the normally open contact MS, which had been closed until then, is opened, and the motor M starts to rotate by inertia.

Then, the rotational speed of the spindle is gradually brought down to a low speed.

This allows the spinning tension to be loosened while the traveler maintains its normal sliding posture, which prevents yarn breakage due to an increase in tension, unlike when the spinning speed is increased to the normal operating speed without reducing the spindle speed. At the same time, ballooning becomes stable.

On the other hand, due to the time-up of the next startup time setting timer T1, its normally open contact T1 closes, so that the motor M
shifts to inert rotation. At the same time, the secondary start time setting timer TR2 starts counting. Then, when the ballooning becomes stable, the timer TR2 performs a time amplifier, its normally open contact T2 is closed, the motor drive electromagnetic contactor M81 is energized again, and the motor M is restarted. Then, the rotational speed of the spindle increases by 2'' and shifts to the normal operating rotational speed. In this case, the rotational speed of the spindle increases while the traveler is in its normal sliding position and the balloon is stable, making it possible to prevent yarn breakage. In addition, when the trap stop push button switch 1) B2 is pressed during machine operation, the motor drive electromagnetic contactor M, 81 is demagnetized, the motor M is stopped, and the auxiliary relay C1 and timer Tll are activated.

TB2 is demagnetized and each normally open contact C 几,,till(,,
.

TB2 opens, normally closed contact TR closes, and the machine stops.

Effects As detailed above, this invention rapidly rotates the spindle by direct startup when restarting the machine, and temporarily applies strong tension to the thread that is slack while the machine is stopped, thereby quickly moving the traveler. Since the traveler is guided to a normal gliding position, unlike conventional methods, the balloon does not collapse due to poor gliding position of the traveler immediately after startup, and thread breakage caused by this can be completely prevented. In addition, after guiding the traveler to the normal gliding position, the main motor is de-energized and rotated by inertia to guide the spindle to low speed rotation, and then, before the spindle stops, the main motor is energized again and the spindle is rotated. By increasing the rotational speed and shifting to the normal rotational speed, the spinning tension is relaxed while the traveler is maintained in its normal sliding position, preventing yarn breakage due to increased tension and stabilizing ballooning again. Thread breakage at startup can be reduced. Moreover, the restart device of the second invention has the advantage of being able to be implemented at low cost because it has a simple configuration that does not require a reactor or a variable speed motor, and simply adds a timer, etc. to the induction motor startup circuit, unlike conventional methods. It has a great effect.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit diagram of a conventional reactor starting method, Fig. 2 is an electrical circuit diagram of a restarting method embodying this invention, and Fig. 3 is an electrical circuit diagram of a restarting method embodying the present invention.
The figure is a time chart, and FIG. 4 is a diagram showing changes in the rotational speed of the spindle at the time of restart. Motor M1 motor drive electromagnetic contactor MS1, - next start time setting timer T1, secondary start time setting timer Ta2,
Auxiliary Relay C 1゜Patent Applicant: Toyota Industries Corporation, Nitto Boseki Co., Ltd.

Claims (1)

[Scope of Claims] l When restarting, the spindle is rapidly rotated by direct startup, and the traveler is quickly returned to its normal sliding position by temporarily applying strong tension to the thread that is slack while the machine is stopped. Then, the main motor is deenergized and rotated by inertia, thereby leading the spindle to low speed rotation, and then, before the spindle stops, the main motor is energized again,
A method for restarting a spinning machine, characterized by increasing the rotational speed of the spindle and shifting it to a normal operating rotational speed. 2 means (FB+, O, al, MS 1 ) for directly starting the motor (M) that rotationally drives the spindle;
Means (TR1) for temporarily cutting off the input source of the motor (M, ) in order to cause the motor (M) to rotate by inertia after a predetermined period of time has elapsed after starting the motor (M); A restart device for a spinning machine, characterized in that the restart device for a spinning machine is provided with means (Tr(2)) for reconnecting the input source in the cut-off state in order to restart the motor (M) that has been turned off before it stops rotating.