JPH0756091B2 - Method and device for controlling tail winding yarn in ring spinning machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spinning machine, particularly a ring spinning machine.

More specifically, the regulation of tail winding yarn in a ring spinning machine equipped with a ring rail automatic lowering mechanism that automatically lowers the ring rail when doffing full-threaded yarn and stops the machine in a state suitable for subsequent doffing work. Regarding technology.

[Conventional technology]

Generally, a tube spinning machine of a ring spinning machine has a structure as shown in FIG. 3, and a sprocket wheel 2 attached to a main shaft 1 rotating in synchronization with a front bottom roller (not shown) causes a chain 3 From the gear 4 driven in the direction of the arrow via the gear 5 to the clutch toothed gear 5 is constantly rotating during operation of the spinning machine, but is idling unless engaged with the slide clutch 6. During molding of the yarn, the slide clutch 6 meshes with the clutch 8 directly connected to the shaper shaft 7 by the force of the spring, and the worm 9 connected to the slide clutch 6 via the spline is in the same direction as the shaper wheel 10. Then, the pulley 11 is rotated in the direction of the arrow to wind up the lifting chain 12, and the ring rail (not shown) connected thereto is lifted. The ring rail repeatedly moves up and down through the lifting chain 12 by the reciprocating swing of the lifting lever 14 caused by the rotation of the heart cam 13, and gradually rises by the above-mentioned mechanism to form a full thread.

When a full pipe is reached, a full pipe signal is issued from an auto counter (not shown), and in this state, the descent time selection limit switch LS1 is pressed at the appropriate position of the ring rail up / down movement, and the motor cutoff limit switch LS2 The main motor (not shown) is disconnected by pressing, and the machine stand enters coasting mode. Next, when the limit switch LS3 is turned on, the lowering solenoid 15 is excited and overcomes the biasing force of the spring to disengage the slide clutch 6 from the clutch 8 and engage with the clutch toothed gear 5. Then, the connection between the shaper shaft 7 and the worm 9 is released, and the rotation of the gear 5 is transmitted to the worm 9 through the slide clutch 6, so that the worm 9 and the pulley 11 reversely rotate, and the ring rail moves to the inertia of the machine base. It descends in synchronization with driving. When the ring rail reaches the bottom, the descent complete confirmation limit switch LS
4 is pressed, the lowering solenoid 15 is cut off, and the automatic lowering of the ring rail stops.

Even while the ring rail is stopped at the lowermost position, the spindle and the yarn thread inserted into the spindle continue to rotate by inertia, so that the tail winding yarn is formed at a predetermined position of the spindle or the yarn thread.

This tail winding yarn is necessary to securely hold the yarn at the beginning of winding on the new empty bobbin when restarting the spinning machine after doffing, and if it is too short, the target yarn retention is achieved. If it is not possible, on the other hand, if it is too long, the waste thread increases and its treatment becomes a problem. Therefore, it is desirable to form the tail winding yarn wound a predetermined number of times.

Conventionally, as a method of regulating the number of times of winding of the tail winding yarn, a circuit as shown in FIG. 4 is used to push the limit switch LS2 at the time of the automatic lowering of the ring rail to cut off the power supply of the main motor so that the machine stand At the same time as starting the coasting operation, the contact b MS of the motor switch was closed to operate the timer relay TR18, and after a certain time from this point, the brake MB was operated to suddenly stop the main motor. This sudden stop of the motor also helps prevent the yarn being spun from losing tension due to an extreme decrease in the spindle speed and causing snare. However, according to this method, the spinning machine itself is changed due to a change in the condition of the spinning machine base, that is, a change in the "weight" of the spinning machine due to the elapsed time after periodic cleaning, or a change in the amount of one full thread. If there is a difference in inertia during rotation of the spindle, the rate of decrease of the spindle rotation speed changes, that is, as shown in the graph of FIG. As a result, there is a large difference in the time required for the ring rail to reach the lowest position, and as shown in Fig. 5 (b), the period for actually forming the tail winding yarn is X, Y, Z, respectively. The number of windings of the tail winding yarn formed as is different.

[Means for solving problems]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof is to provide a means capable of always forming a tail winding yarn with a constant number of windings, even if there is a difference in the machine tone of the spinning machine.

The purpose of this is to stop the ring spinning machine in order to doff the full thread, and after the main motor of the spinning machine stops, the ring rail is automatically lowered by the inertia rotation of the spinning machine to the bottom winding position of the spindle. Achieved by a method for regulating the tail winding thread, which is characterized in that the length of the tail winding thread is made constant by braking the main motor and stopping it completely after a predetermined time from the time when it reached To be done.

According to the second aspect of the present invention, in a ring spinning machine equipped with a ring rail automatic descending mechanism for doffing full-threaded yarn, the spinning machine is operated by the action of the descending mechanism after the main motor is stopped during doffing. Provide a timer relay that starts operation when the ring rail descends to the tail winding position due to inertial rotation, further install the contact of the timer relay in the circuit of the main motor brake of the spinning machine, and the timer relay operates Then, after a predetermined time, there is provided a tail winding yarn regulating device characterized in that the brake is operated to stop the main motor.

According to the present invention, the timer relay is started from the end point of the descent of the ring rail where the formation of the tail winding yarn is started, and the main motor is braked after a certain period of time from that point. The total number of revolutions is substantially constant, and the number of times the tail winding is wound is always constant regardless of changes in the tone of the machine base.

〔Example〕

FIG. 1 shows a part of a control circuit for carrying out the present invention.

When the spinning machine reaches full capacity, (1) the full contact of the automatic counter and the limit switch LS1 are closed and the relay CR3 of the circuit 1 is excited by the same mechanism as in the case of the prior art shown in FIG. , Self-held. As a result, the b contact CR31 of the circuit 2 is opened, and further the limit switch LS2 is opened by the above-mentioned mechanism, whereby the relay MS of the power supply circuit of the main motor is demagnetized and the spinning machine enters inertial rotation. Next, when the limit switch LS3 of the circuit 3 is pressed, the solenoid for lowering the ring rail is excited, and the automatic lowering of the ring rail is started. When the descent is completed, the limit switch LS4 of the circuit 3 is pushed and the timer relay TR19 of the circuit 4 is excited. As a result, the contact TR19 of the circuit 6 is closed after a predetermined time set in the timer relay TR19, and the brake MB operates to completely stop the main motor.

As a result, the rotation of the spindle at the tail winding position is fixed for a certain time X ', as shown in FIG.
The number of windings is continued by Y ', Z' (X '= Y' = Z '), and a constant number of windings is always guaranteed.

In addition, when the machine stand is stopped except when the pipe is full, the normal stop timer relay TR18 provided in the circuit 5 is excited at the same time as the main motor is powered off as described in the above-mentioned prior art. After a predetermined time from this point, the motor is braked to prevent snare from occurring. This TR18 is irrelevant to the braking circuit 6 because the b contact CR31 of the circuit 6 is opened when the TR18 is full.

〔The invention's effect〕

According to the present invention, when the ring rail automatically descends when the pipe is fully stopped, the timer relay is started from the time when the ring rail reaches the bottom tail winding position, and the predetermined time of the spindle at this position is reached. Since the main motor is braked after the tail winding of the specified number of turns is formed by the inertial rotation of the machine, compared to the case where the timer relay was started at the same time when the inertial rotation of the main motor was started, Even if the condition is light and heavy, the variation in the number of tail windings can be greatly reduced, and the tail winding of the specified number of windings can always be guaranteed.

In addition, when the machine is stopped other than when the pipe is full, a timer relay that starts the operation at the same time as the inertial rotation of the motor is provided separately as in the conventional case, so there is a problem in preventing the snare of the yarn during spinning. Absent.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a circuit for carrying out the present invention, FIG. 2 is a graph showing the state of the ring rail descending and the change in the rotational speed of the spindle at the time of full pipe stop according to the present invention, FIG. Is a schematic perspective view of a ring rail lifting mechanism of a spinning machine, FIG. 4 is a circuit diagram for braking a conventional main motor, and FIG. 5 is a state in which a ring rail is lowered and a spindle is rotated when a conventional pipe is fully stopped. It is a graph which shows the change of number. 4 …… Gear 5 …… Clutch toothed gear 6 …… Slide clutch 7 …… Shaper shaft 8 …… Clutch 9 …… Warm 10 …… Shaper wheel 12 …… Lifting chain 13 …… Heart cam 14 …… Lifting lever 15… … Descent solenoid LS1 to LS4 …… Limit switch TR19 …… Timer relay

Claims (2)

[Claims] 1. A ring rail is automatically lowered by inertial rotation of a spinning machine after a main motor of the spinning machine is stopped at the time of stopping the doffing of a full yarn in the ring spinning machine, and the bottom rail of the spindle is wound down. Starting from the time point when the position is reached, and after a predetermined time from that point, the main motor is braked to stop it completely, thereby making the length of the tail winding yarn constant, and regulating the tail winding yarn. . 2. A ring spinning machine equipped with a ring rail automatic lowering mechanism for doffing full-threaded yarn, wherein the ring rail is rotated by inertia of the spinning machine by the action of the descending mechanism after the main motor is stopped during doffing. Is provided with a timer relay that starts operation when it has dropped to the tail winding position, and the contact of the timer relay is further installed in the circuit of the brake for the main motor of the spinning machine, and a predetermined time after the timer relay is activated, A tail winding device that operates a brake to stop a main motor.