JPS5929687B2 - Method for absorbing yarn tension fluctuations in open-end spinning machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for absorbing tension fluctuations in yarn in an open-end spinning machine, and in particular, the present invention relates to a method for absorbing tension fluctuations in yarn in an open-end spinning machine. The yarn is then pulled out from the converging heating device by a pull-out roller, and wound around the outer periphery of a loaf bin that is pressurized toward the take-up roller to form cheese. An open-end spinning machine that can absorb the fluctuations in yarn tension that sometimes occur due to slip rotation of the cheese, and the fluctuations in yarn tension that occur due to differences in yarn paths during spinning operation of the machine. The present invention relates to a method for absorbing tension fluctuations in yarn.

Generally, in an open-end spinning frame, the fiber bundles supplied by a fiber bundle supply device such as a feed roller are spread by a fiber opening device such as a combing roller, and then the fiber bundles are heated in a convergent heating device such as a rotating spinning chamber. The thread is drawn out from the condensing heating device by pull-off rollers such as a draw-off roller and a top roller, and wound around the outer circumference of a bobbin that was previously pressed by a take-up roller to form cheese. It was supposed to be done.

When the open-end spinning machine is started (in this case, the rotary spinning chamber etc. are started, the draw-off roller and the take-up roller are reversed, and the end of the yarn being wound around the cheese is rotated into the rotary spinning chamber). After the yarn splicing is completed, the draw-off roller and the take-up roller are switched to normal rotation and the spinning operation is started.

However, in the open-end spinning machine described above, when the machine is started, if the draw-off roller and take-up roller are suddenly started in reverse, an inertial force acts on the cheese and the gap between the cheese and the take-up roller is This caused the cheese to start rotating later than the take-up roller.

As a result, the thread tension increases significantly between the cheese and the nip point of the draw-off roller and top roller.
Thread breakage occurred, making the thread splicing operation extremely difficult.

Also, even when the draw-off roller and take-up roller are switched to normal rotation after yarn splicing is completed, the cheese rotates due to inertia and slip occurs between the cheese and the take-up roller, resulting in a nip between the cheese, the draw-off roller, and the top roller. Thread slack occurs in the thread between the points, and this slack becomes entangled in the cheese, which is a major cause of thread breakage during unwinding in the winder or the like in the next process.

Furthermore, even when the open-end spinning machine is stopped, the draw-off roller and take-up roller are suddenly stopped by a brake or the like in order to regulate the yarn end length, so the cheese rotates by inertia and the take-up roller Slip occurs between the cheese and the nip point of the draw-off roller and the top roller, and the tension of the thread increases significantly, which may cause thread breakage.

The above phenomenon was more pronounced as the cheese diameter became larger.

Also, during spinning operation of the machine, variations in thread tension occur due to differences in thread paths, and these variations in thread tension are a major cause of problems in cheese formation.

This invention was made in order to eliminate the above-mentioned defects in the conventional open-end spinning machine, and its purpose is to reduce the yarn tension fluctuations that occur when the machine starts, stops, and during spinning operation. It is an object of the present invention to provide a method for absorbing yarn tension fluctuations in a novel open-end spinning frame, which can absorb and reliably prevent adverse phenomena such as yarn breakage.

Below, the configuration of an open-end spinning machine embodying the present invention will be explained with reference to FIG. The fiber bundle fed by the feed roller is opened by a combing roller, and then heated in a focused manner in a rotating spinning chamber to form a yarn 12, which is sent out from a yarn guide tube 13 to the outside.

A draw-off roller 14 common to all spindles is disposed above the yarn guide tube 13 so as to be actively rotatable, and a support rod 15 is disposed above the draw-off roller 14 .

A roller holder 16 is rotatably supported for each weight on the support rod 15, and a top roller 11 is rotatably supported at the tip of the roller holder.

A coil spring (not shown) is elastically mounted between the support rod 15 and each roller holder 16, and urges the top roller 1γ to contact the outer peripheral surface of the draw-off roller 14.

Therefore, the rotation of the draw-off roller 14 causes the top rollers 11 to contact each other and rotate simultaneously, and the yarn 12 sent out from the yarn guide tube 13 of the spinning unit 11 is transferred to both rollers 14.1''.
1 and pulled out upwards.

Above the support rod 15 is a take-up roller 1 common to all spindles.
8 is arranged to be actively rotatable, and a bobbin 20 rotatably supported by the cradle arm 19 is connected to the winding roller 18.
Each weight is pressurized towards the center.

Therefore, the bobbin 20 is simultaneously rotated in contact with the rotation of the winding roller 18, and the thread 12 drawn out by the draw-off roller 14 and the top roller 11 is wound around the outer periphery of the bobbin 20 while being traversed, and the cheese 21 is wound around the bobbin 20. Form.

Next, when starting, stopping, and spinning the machine,
To explain the structure for absorbing the tension fluctuation of the yarn 12 that occurs between the take-up roller 18 and the nip point of the draw-off roller 14 and top roller 17, there is a common structure for all spindles above the support rod 15. A rotating shaft 22 is rotatably disposed, and a driven gear 23 is fixed to one end thereof via an electromagnetic clutch MC4, as shown in FIG.

A driving gear 25 attached to a motor shaft 24 of a motor M is meshed with the driven gear 23, and just before the machine is stopped, the electromagnetic clutch MC4 is energized and the motor M is started. The rotation shaft 22 is rotated counterclockwise by a predetermined angle via the rotation shaft 23 .

A return spring 2'6 is provided at one end ζ of the rotating shaft 22 so as to be close to the electromagnetic clutch MC4, and after the rotating shaft 22 is rotated by a predetermined angle of 7 degrees as described above, the electromagnetic clutch When the MC4 is demagnetized and the motor M is stopped, the rotation shaft 22 is rotated back in the clockwise direction.

Further, an operating lever 28 is rotatably supported on the outer periphery of the rotating shaft 22 via a support tube 27 for each weight, and comes into contact with the thread 12 at its distal end hook portion 28a.

As is clear from FIG. 4, the support tube 2T has a long hole 29.
is formed, and a driving pin 30 is provided protruding from the outer periphery of the rotation shaft 22 so as to be positioned within the elongated hole 29 .

Therefore, when the rotating shaft 22 is held in the original position shown in FIG. 28a, the draw-off roller 1 is freely movably held in contact with the thread 12.
4 and the winding roller 18 are started in reverse rotation and then switched to normal rotation, the thread slack that occurs due to the slip rotation of the cheese 21 is as shown by the chain line in FIG.
In addition to being absorbed by the rotation of the operating lever 28 due to its own weight, fluctuations in yarn tension that occur due to path differences due to traverse of the yarn 12 during spinning operation of the machine are also absorbed by the swinging of the operating lever 28. Absorbed by movement.

Further, when the rotation shaft 22 is rotated by a predetermined angle by the motor M as described above just before the machine is stopped, the drive pin 30 engages with one side of the elongated hole 29, as shown in FIGS. 2 and 4. As is clear from the figure, the operating lever 28 is rotated counterclockwise,
The yarn 12 is reserved between the take-up roller 18 and the nip point of the draw-off roller 14 and top roller 11, and the reserved yarn 12 prevents the slip rotation of the cheese 21 when the take-up roller 18 is stopped or when the reverse rotation is started. The increase in thread tension that occurs with this is alleviated.

Next, the control circuit of the open-end spinning machine constructed as described above will be explained with reference to FIGS. 5a and 5b.

Now, in this control circuit, the first to nineteenth circuits are connected between the power supply lines L and L.

First, the first circuit has a normally open starting push button switch PBI.
and the electromagnetic contactor MS of the machine motor are connected, and its self-holding normally open contact M'S-1 is connected to the starting push button switch P.
Connected in parallel to B1 and normally open contact MS-
2, MS-3 is connected to the second circuit and the tenth circuit.

A timer TRO for checking the start of the machine motor is connected to the second circuit, and its normally open contacts TR0-1 are connected to the third circuit 6).

The third to sixth circuits are connected in parallel to the timer TRO of the second circuit.

And the first relay CR1 is connected to the third circuit,
The normally open contacts CRI-1, CR1-2, and CRI-4 are connected to the fourth circuit, the fifth circuit, and the fourteenth circuit,
Normally closed contacts CR1-3 and CR1-5 are the 9th circuit and the 17th circuit.
connected to the circuit.

A first timer TR1 is connected to the fourth circuit, and its normally open contact TR1-1 is connected to the sixth circuit.

A second timer TR2 is connected to the fifth circuit, and its normally open contact TR2-1 is connected to the seventh circuit.

A second relay CR2 is connected to the sixth circuit, and its self-holding normally open contact CR2-1 is the normally open contact TRl- of the sixth circuit.
1, and the normally open contact CR2-3 is connected in parallel to the 15th
Connected to the circuit and normally closed contacts CR2-2, CR
2-4 are connected to the 9th circuit and the 18th circuit.

A third relay CR3 is connected to the seventh circuit, and its self-holding normally open contact CR3-1 is connected in parallel to the normally open contact TR2-1 of the seventh circuit in the eighth circuit, and the normally open contact CR3 -2, CR3-4°CR3-6 is connected to the 9th circuit, 16th circuit, and 18th circuit, and the normally closed contact CR3-3°CR3-5 is connected to the 14th circuit and the 17th circuit. There is.

A third timer TR3 is connected to the ninth circuit, and its normally closed contact TR3-1 is connected to the seventh circuit.

A normally open stop push button switch PB2 and a fourth relay CR4 are connected to the 10th circuit, and its self-holding normally open contact CR4-1 is connected in parallel to the stop push button switch PB2 in the 11th circuit. At the same time, normally open contact C
R4-2°CR4-3 is connected to the 12th circuit and the 19th circuit.

The 11th circuit includes the normally open contact MS-3 of the 10th circuit and the fourth
A fourth timer TR4 is connected in parallel with relay CR4, and its normally open contact TR4-2 is connected to the thirteenth circuit, and its normally closed contacts TR4-1 and TR4-3 are connected to the first circuit.
2 circuit and the 19th circuit.

A motor M for rotating the operating lever 28 is connected to the twelfth circuit.

A fifth timer TR5 is connected to the thirteenth circuit, and its normally closed contact TR5-1 is connected to the first circuit.

An electromagnetic clutch MCI for reversing the take-up roller 18 and the draw-off roller 14 is connected to the fourteenth circuit, and the first
An electromagnetic clutch MC2 for coupling the feed roller is connected to the fifth circuit.

An electromagnetic clutch MC3 for normal rotation of the take-up roller 18 and the draw-off roller 14 is connected to the 16th circuit, and the first
The 7 circuits include the take-up roller 18 and the draw-off roller 1.
An electromagnetic brake MB1 for braking No. 4 is connected.

An electromagnetic brake MB2 for braking the feed roller is connected to the 18th circuit, and an electromagnetic clutch MC4 for coupling the rotating shaft 22 shown in FIG. 3 is connected to the 19th circuit.

The operation of the open-end spinning frame configured as described above will be explained below.

Now, when the machine is in a stopped state, the motor M shown in FIG. 3 is stopped, the electromagnetic clutch MC4 is demagnetized, and the rotation shaft 22 is moved by the solid line in FIGS. 1 and 4 due to the elasticity of the return spring 26. The operating lever 28 is held at the original position shown in FIG. be.

When starting machine operation from this stopped state, when the start push button switch PBl of the first circuit is closed in the control circuit shown in FIGS. 5a and 5b, the electromagnetic contactor MS of the first circuit is energized. , a machine motor (not shown) is started, and the combing machine installed in the spinning unit 11 is rotated;
At the same time as the machine operation of the rotary spinning chamber is started, the drive shaft (not shown) of the feed roller is driven.

Further, the normally open contact MS-2 of the second circuit is closed by the energization of the electromagnetic contactor MS, and the timer TRQ is set.

When machine operation is started in this manner and reaches a predetermined speed, and the timer TRO times out, the normally open contacts TR0-1 of the third circuit are closed and the first relays CR, 1 are energized.

By energizing the first relay CR1, the normally open contacts CR1-1 and CR1-2 of the fourth and fifth circuits are closed, and the first timer TR1 and second timer TR2 are set.

Further, as the first relay CR1 is energized, the normally closed contact CRI-5 of the 17th circuit is opened, and the electromagnetic brake MBl for braking the take-up roller 18 and the draw-off roller 14 is demagnetized. 14-circuit normally open contact CRI-4
is closed, the electromagnetic clutch MCI is energized, and the take-up roller 18 and draw-off roller 14 shown in FIG. 1 are started to rotate in reverse.

During this reverse start, an inertial force acts on the cheese 21 and slip occurs between the cheese 21 and the take-up roller 18, and the cheese 21 begins to rotate later than the take-up roller 18, causing the cheese 21 and the Although the tension of the yarn 12 increases between the off roller 14 and the nip point of the top roller 1T, this increase in yarn tension is alleviated by the reserved yarn 12 as shown by the chain line in FIG.

Therefore, the end of the yarn 12 wound around the cheese 21 is sent back into the rotary spinning chamber without causing yarn breakage.

Further, after the take-up roller 18 and the draw-off roller 14 are started in reverse, the first timer TR1 times up, so the normally open contact TR1-1 of the sixth circuit is closed and the second
Relay CR2 is energized.

The normally open contact CR2-3 of the 15th circuit is closed by the energization of the second relay CR2, the electromagnetic clutch MC2 is energized, and the feed roller is connected to the drive shaft to feed the fiber bundle into the rotary spinning chamber. start.

When the second timer TR2 times out in this state, the normally open contact 'TR2-1 of the seventh circuit is closed and the third
Relay CR3 is energized J″1.

The energization of the third relay CR3 opens the normally closed contact CR3-3 of the 14th circuit, demagnetizing the electromagnetic clutch MCi, and closes the normally open contact CR3-4 of the 16th circuit, opening the electromagnetic clutch MC3. The take-up roller 1 is energized and
8 and the draw-off roller 14 are switched from reverse rotation to normal rotation, and yarn splicing is performed.

Even during this normal rotation switching, the cheese 21 rotates due to inertia and slip occurs between the cheese 21 and the take-up roller 18, and the cheese 21
1 and the nip point of the draw-off roller 14 and top roller 11.
This is absorbed by the rotation of the operating lever 28 due to its own weight, as shown by the chain line in the figure.

Therefore, the take-up roller 18 and the draw-off roller 14
As the yarn 12 rotates in the normal direction, the yarn 12 spun from the rotating spinning chamber in the spinning unit 11 passes through the nip point between the draw-off roller 14 and the top roller 1γ, is led out to the outer periphery of the take-up roller 18, and is traversed to the cheese 21. The material is wound evenly around the outer circumference of the material.

Furthermore, during this winding operation, as is clear from FIG. 1, the actuating lever 28 is freely movably held in contact with the yarn 12 at its distal end hook portion 28a, so that the traverse of the yarn 12, etc. Fluctuations in yarn tension caused by path differences are absorbed by the swinging of the operating lever 28.

Next, when stopping the machine operation,
Stop push button switch P of the 10th circuit in the control circuit of
When B2 is closed, the fourth relay CR4 is energized and the fourth timer TR4 is set.

Due to the energization of the fourth relay CR4, the normally open contact CR4-2 of the 12th circuit is closed to start the motor M, and the normally open contact CR4-3 of the 19th circuit is closed to excite the electromagnetic clutch MC4. be done.

As a result, as is clear from FIG.
Drive gear 25, driven gear 23 and electromagnetic clutch M
The rotation shaft 22 is rotated counterclockwise via C4,
As shown in FIGS. 2 and 4, the drive pin 30 is inserted into the elongated hole 29.
The actuating lever 28 is rotated in the same direction.

Therefore, a predetermined length of yarn 12 is reserved between the take-up roller 18 and the nip point of the draw-off roller 14 and top roller 17 in order to alleviate the increase in yarn tension at the time of stopping and restarting. .

After a predetermined length of yarn 12 is thus reserved, when the fourth timer TR4 times up, the normally open contact TR4-2 of the thirteenth circuit is closed and the fifth timer TR5 is set.

Further, as the time has elapsed, the normally closed contact TR4-1 of the 12th circuit is opened and the motor M is stopped.
Normally closed contact TR4-3 of the 19th circuit is opened and electromagnetic clutch MC4 is demagnetized.

Therefore, the rotating shaft 22 in the rotating state shown in FIG. 2 is returned to the original position shown by the solid line in FIGS. 1 and 4 due to the elasticity of the return spring 26, and the operating lever 2B reserves the thread 12. maintained in condition.

After that, the fifth timer TR5 times out and the first
The normally closed contact TR5-1 of the circuit is opened, the electromagnetic contactor MS is energized, the machine motor is stopped after inert rotation, and the machine operation of the combing roller, rotating spinning chamber, and feed roller drive shaft is controlled by inert rotation. It will be stopped later.

Further, by energizing the electromagnetic contactor MS, the normally open contact MS-2 of the second circuit is opened, and the first relay CR1 of the third circuit and the second relay CR2 of the sixth circuit are energized,
The normally open contact MS-3 of the tenth circuit is opened and the fourth relay CR4 is energized.

The energization of the first relay CRI closes the normally closed contacts CR1-3 of the ninth circuit, and the energization of the second relay CR2 closes the normally closed contacts CR2-2 of the ninth circuit. Set.

Furthermore, with the castration of the second relay CR2, the 15th relay
The normally open contact CR2-3 of the circuit is opened and the electromagnetic clutch M
C2 is demagnetized and the normally closed contact CR of the 18th circuit
2-4 is closed, electromagnetic brake MB2 is energized,
The feed roller is separated from the drive shaft and suddenly stopped by the electromagnetic brake MB2, thereby stopping the supply of the fiber bundle to the rotating spinning chamber.

When the operation of the spinning unit 11 is stopped in this manner and the third timer TR3 times out, the normally closed contact TR3-1 of the seventh circuit is opened and the third relay CR3 is energized.

Due to the castration, the normally open contact CR3-4 of the 16th circuit is opened and the electromagnetic clutch MC3 is demagnetized, and the 17th circuit
The normally closed contact CR3-5 of the circuit is closed and the electromagnetic brake M
B1 is excited, and the take-up roller 18 and draw-off roller 14 are suddenly stopped by the electromagnetic brake MB1.

During this stop, as well as when the take-up roller 18 is started in reverse, slip occurs between the cheese 21 and the take-up roller 18, and the cheese 21 rotates by inertia, causing a significant increase in the tension of the yarn 12. As described above, a predetermined length of yarn 12 is inserted between the take-up roller 18, the nip point of the draw-off roller 14, and the top roller 11 immediately before the take-up roller 18 stops.
is reserved, this reserved thread 12
As a result, the increase in thread tension is alleviated, and thread breakage can be reliably prevented.

As described in detail above, this invention is designed to reserve a predetermined length of yarn by actively bending it between the pull-out roller and the take-up roller immediately before the machine stops. It is possible to absorb fluctuations in yarn tension that occur due to cheese slip when the machine is stopped or started in reverse rotation, and even when the take-up roller is switched to normal rotation or when the machine is in spinning operation. Since the lever is held in contact with the yarn and is freely movable, the swinging of the operating lever prevents yarn slack that occurs when the take-up roller is switched to normal rotation, and yarn path differences during spinning machine operation. It is possible to absorb fluctuations in yarn tension that occur along with this, and has an excellent effect of reliably preventing bad phenomena such as yarn breakage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an open-end spinning frame embodying the present invention, FIG. 2 is a longitudinal sectional view showing the operating state of FIG. 1,
3 is an enlarged perspective view of the main part of the drive structure of the rotating shaft shown in FIG. 1, FIG. 4 is an enlarged sectional view of the main part of FIG. 1, and FIG.
b is a control circuit diagram. Spinning unit 11, yarn 12, draw-off roller 14, top roller 1γ, take-up roller 18, bobbin 20, cheese 21, rotating shaft 22, operating lever 28, motor M1 electromagnetic clutch MC4°

Claims (1)

[Scope of Claims] 1. Fibers opened by a fiber opening device are heated in a focused manner by a focused heating device to form a thread, and the thread is pulled out from the focused heating device by a pull-out roller and processed toward a take-up roller. In an open-end spinning machine that forms cheese by winding it around the outer periphery of a pressed bobbin, a predetermined length of yarn is actively bent between the pull-out roller and the take-up roller just before the machine stops to store the yarn. The yarn tension fluctuation in an open-end spinning machine is characterized in that the reserved yarn absorbs the yarn tension fluctuation that occurs due to the slip rotation of the cheese when the take-up roller is stopped and when the winding roller is started in reverse. Absorption method. 2 The fibers opened by the opening device are focused and heated by a focusing heating device to form a thread, and the thread is pulled out from the focusing heating device by a pull-out roller, and the outer periphery of the bobbin is pressurized toward a take-up roller. In an open-end spinning machine that forms cheese by winding the thread, an operating lever disposed between the pull-out roller and the winding opening is actively rotated while in contact with the thread just before the machine stops. By doing so, a predetermined length of thread is reserved between the two rollers, and the reserved thread is used when the winding roller is stopped and when the winding roller is started in reverse.
By alleviating the increase in yarn tension that occurs due to the slip rotation of the cheese, and by holding the actuating lever freely in contact with the yarn, the slip rotation of the cheese is prevented when the take-up roller is switched to start normal rotation. A method for absorbing yarn tension fluctuations in an open-end spinning machine, characterized by absorbing yarn slack that occurs due to the spinning machine, and yarn tension fluctuations that occur due to differences in yarn paths during spinning operation of the machine.