JPH05222626A - Method for starting open end spinning machine and its apparatus - Google Patents

Abstract

PURPOSE:To enable the smooth winding of yarn by maintaining the rotational speed ratio of a taking out roller to a winding roller at a specific value. CONSTITUTION:Plural spindles are arranged in the longitudinal direction of a frame and respective rollers 5 and 7 are arranged on the respective line shafts 10 and 11 extended in the longitudinal direction of the frame. The respective line shafts are driven with separate variable speed motors (M3) and (M4). In the process, piecing is carried out after stopping the frame to restart the spinning. The line shafts 10 and 11 are cut off from the linked motors (M3) and (M4) by clutch operation. In this state, the starting of the motors is performed to accelerate both the motors. After confirming that the rotational speed ratio of both (M3/M4) attains a prescribed value, piecing operation is started. Clutches 14 and 15 are simultaneously operated to connect the line shafts to the motors. The rotational speeds of the respective motors are increased to a steady spinning state while performing the feedback control so as to maintain the ratio of the rotational speeds of both the motors at the prescribed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting method and apparatus for temporarily stopping an open-end spinning machine, performing simultaneous yarn splicing, and then restarting spinning.

[0002]

2. Description of the Related Art Usually, an open-end spinning machine comprises a spinning unit composed of a rotor and a fiber-spreading roller, a feed roller for supplying a sliver to the fiber-spreading roller, a pull-out roller for pulling out the thread from the rotor, and a winding for winding the thread on a bobbin. A plurality of weights configured by a supply / rewind system including a take-up roller are arranged in parallel in the longitudinal direction of the machine base.

The spinning units are arranged along an endless belt, while the rollers of the supply / winding system are arranged along respective line shafts. The endless belt and each line shaft are driven by separate variable speed motors in order to easily change the spinning conditions. After stopping this open-end spinning machine all at once for doffing, etc., when starting spinning again, the spun yarn ends separated from the fiber bundles in the rotor of each weight are stopped in the rotor at the time of stopping. It is necessary to carry out a yarn splicing operation in which the length is reversed and the two are connected again.

There is a reserve method as one method of this yarn splicing operation, and a yarn portion of a predetermined length reserved in the yarn path between the winding roller and the drawing roller at the time of stop is released at the time of starting. After being fed back into the rotor and completely connected to the fiber bundle accumulated on the inner peripheral wall of the rotor again, the pull-out roller and take-up roller are started, and the speed of the rollers is gradually increased to a normal operating state. Is being done.

The above-mentioned start-up is performed on all the motors including the motors M3 and M4 for driving the line shaft 10 of the pull-out roller 5 and the line shaft 11 of the take-up roller 7 shown in FIG. 6, for example. It is done by starting from the stopped state according to the procedure of.

[0006]

In such starting, it is necessary that the speed ratio between the rollers of the winding system is always maintained constant. In particular, the speed ratio of the drawing roller 5 / winding roller 7 is important, and when this value is smaller than a predetermined value, the yarn tends to be tensioned between the drawing roller and the winding roller, damaging the yarn quality and tension. It may break. On the other hand, if this value is too large, the yarn may loosen during winding, causing the package to collapse or causing defects such as snare.

However, since the load applied to the motor is greatly different between the line shaft carrying the pull-out roller and the line shaft carrying the take-up roller, as shown in FIG. The take-up roller has a smaller gradient. This means that the tension applied to the yarn becomes abnormally high at the beginning of the rising period, and the yarn breakage rate increases until the time T in the figure is reached, for example.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems of the prior art and to provide a method and apparatus capable of smoothly restarting spinning after simultaneous yarn splicing.

[0009]

The object of the present invention is to arrange a plurality of weights consisting of a spinning unit and a feeding / winding system including a feed roller, a drawing roller and a winding roller in the longitudinal direction of a machine base, Each roller of the winding system is arranged on each line shaft extending in the longitudinal direction of the machine base,
In an open-end spinning machine in which each line shaft is driven by a separate variable speed motor, the line shafts of the pull-out roller and the take-up roller are linked by a clutch operation when the spinning is restarted by performing the splicing after stopping the machine stand. Starting the motor in a state of being separated from the motor,
Both motors are accelerated to a predetermined rotation speed suitable for yarn splicing operation, and after confirming that this has reached a steady state and the ratio of both has reached a predetermined value, the yarn splicing operation is started, and at the same time, The clutches of the line shafts that cooperate with these two motors are operated to connect to the motors, and the rotation speeds of the respective motors are controlled in a steady spinning state while performing feedback control so that the ratio of the rotation speeds of the two motors maintains the predetermined value. It is achieved by the start-up method of the open-end spinning frame, which is characterized by increasing the speed up to.

In another aspect of the present invention, a plurality of weights each including a spinning unit and a feeding / winding system including a feed roller, a pulling roller and a winding roller are arranged in the longitudinal direction of the machine base. Each roller of the supply and winding system,
An open-end spinning machine, which is arranged on each line shaft extending in the longitudinal direction of the machine base and each line shaft is driven by a separate variable speed motor. The line shafts of the drawing roller and the winding roller are linked. The clutch connected to the motor, the means for detecting the rotation speed of the motor, and the ratio of the rotation speeds of the two motors are calculated based on the detection signal from the detection means. An open-end spinning machine is provided, which is provided with a means for feedback controlling the rotation speed.

[0011]

Before the yarn splicing, the motors for driving the pull-out roller and the take-up roller are first started with the clutch disengaged, and the respective detecting motors bring the respective motors to predetermined rotational speeds suitable for yarn splicing. Confirm that you have reached. In this state, the yarn splicing operation is completed. At the end of the yarn splicing operation, the clutches of the both motors are operated to connect the line shaft to the motors to rotate the pull-out roller and the take-up roller. Then, while monitoring the rotation speed by the detection means, the control means increases the rotation speed of the motor by feedback control so that the ratio of both rotation speeds maintains a predetermined value, and shifts to a steady operation state.

According to this, the motors for driving the line shafts of the pull-out roller and the take-up roller are rotating at a predetermined speed in advance, and the ratio of the two is already a desired value suitable for winding the yarn. Therefore, even if the load of the line shaft is applied to the motor due to the engagement of the clutch at the start of spinning, the ratio of the rotational speeds of both motors does not collapse, and good winding is started. Further, when the motor speed is increased thereafter, this ratio is maintained by the feedback control, and the steady operation state is reached.

Based on the preferred embodiment shown in the drawings,
The present invention will be described in more detail.

[0014]

1 is a schematic diagram of a drive system of an open-end spinning frame showing a first embodiment of the present invention. The open-end spinning machine includes a spinning unit 3 including a rotor 1 and an opening roller (not shown), a feed roller 4 that feeds a sliver S to the spinning unit 3, a drawing roller 5 that pulls out a yarn from the rotor, and a bobbin 6 that is a yarn Y. A plurality of sets of a supply / winding system roller, which is a winding roller 7 for winding up, is arranged in the longitudinal direction of the machine base. It should be noted that only one spindle is shown in the figure and the others are omitted.

The spinning unit 3 is rotationally driven by contacting an endless belt 8 driven by a motor M1, and each roller is driven along a line shaft 9, 10, 11 connected to a separate motor M2, M3, M4. It is installed at a specified pitch. An inverter 12 is attached to each of the motors M1 to M4, and its speed is made variable by a command signal from a control device 13 for controlling the operation of the open-end spinning frame. The line shafts 10 and 11 are connected to the output shafts m3 and m4 of the respective motors via clutches 14 and 15, respectively, and are driven / stopped all at once. The line shaft 9 is directly connected to the output shaft m2 of the motor, and each feed roller 4 is connected to the line shaft 9 via the clutch 16.
It can be driven / stopped independently from each other by operating the clutch.

Further, the output shaft m of the motors M1, M3, M4
1, m3 and m4 are sensors 2 for detecting the rotational speed
6, 17, and 18 are attached and are signal-connected to the control device 13. When the clutch 22 is engaged between the pull-out roller 5 and the take-up roller 7 when the machine base is stopped, the rack / pinion mechanism 19 acts to move horizontally to bend the yarn path between the pins 20. A reserve mechanism A including a bar 21 that stores a yarn length for yarn splicing is installed. This mechanism is described in Japanese Patent Publication No. 61-20653, which is a prior application of the present applicant, and therefore detailed description thereof will be omitted.

The procedure for starting spinning after the machine stand is stopped by this configuration will be described with reference to the timing chart of FIG.
Prior to yarn splicing, the motors M1, M2, M3 and M4 are simultaneously started at a low speed. However, the motors M2, M3, M4
Causes the clutches 14, 15 and 16 to be disengaged while idling. When the control device 13 confirms that the rotation speeds of the motors M3, M4, M1 detected by the sensors 17, 18, 26 after a predetermined time has reached a value suitable for yarn splicing, the reserve mechanism A The clutch 22 is disengaged, the reserved yarn is released by the action of the spring 23, and the yarn is re-fed into the rotor 1 which is already in a rotating state for yarn splicing.

At the same time, the clutches 14, 15, 16 of the respective line shafts are simultaneously put in, and the rollers 4, 5, 6 start to rotate. At this time, since the motors M3 and M4 of the pull-out roller 5 and the take-up roller 7 have already reached a predetermined rotation speed due to idling, the rotation disturbance is small even if a load is applied by the engagement of the clutch, and both rollers are prevented. 5,7
Instantly obtains a predetermined rotation speed, and the yarn is smoothly drawn out and wound up.

After that, the rotational speeds of the motors M3, M4 and M1 are checked again by the sensors 17, 18 and 26, and it is confirmed that the ratio is maintained at a predetermined value. A command is issued and the rotational speed of the motor is proportionally and gradually increased to the value during steady spinning. During this acceleration, the sensors 17, 18, and 26 are operated by the motor M.
The rotation speed of 3, M4, M1 is monitored, and
The control device 13 performs feedback control on the inverter / motor so that the rotation speed ratio of each motor is maintained at a predetermined value.

Therefore, the speeds of the pull-out roller 5 and the take-up roller 7 are always kept at a predetermined ratio that allows smooth winding of the yarn. FIG. 3 is a schematic diagram of a drive system of an open-end spinning frame showing a second embodiment of the present invention. This example differs from the first example described above in that the pull-out roller 5
The line shafts 10 and 11 of the take-up roller 7 are divided into a plurality of blocks 10 'and 11' by the clutches 14 'and 15' for each intermediate piece 24, and each block 10 ', 11' has a predetermined number. And the thread reserve mechanism A common to these weights.

At the start of spinning, as shown in FIG. 4, from the first block on the side closer to the motor to the block on the side farther from the first block, the motor is sequentially loaded with the roller load of each block by the above-described procedure at a low speed. When all the weights have been started, all the motors are speeded up at once to a steady operating speed. According to this, the amount of load applied to the motor is reduced by closing the clutch once, so that the ratio of the rotation speeds of the pull-out roller and the take-up roller when the clutch is closed is greatly reduced.

FIG. 5 is a schematic diagram of the third embodiment of the present invention. The difference from the first embodiment is that the motor M3 for driving the pull-out roller 5 and the motor M4 for driving the take-up roller 7 are different.
In addition, the flywheel 25 is attached to further smooth the disturbance of the rotation speed when a load is applied by closing the clutch.

[0023]

As described above in detail, according to the present invention, prior to the start of spinning of the open-end spinning machine, the motor for driving the pull-out roller and the take-up roller is preliminarily idled to a predetermined rotation speed. Since the roller load is connected to this by a clutch operation at the start of spinning, the disturbance in the ratio of the rotational speeds of both motors or rollers due to the connection of the load is reduced, and good yarn winding can be performed. It will be possible. Furthermore, until the steady operating speed is reached, the rotation speed of both motors or rollers is detected, and the motor is accelerated while feedback control is performed so that this ratio becomes constant. Can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a drive system of an open-end spinning frame showing a first embodiment of the present invention.

FIG. 2 is a timing chart showing a procedure of a spinning start operation according to the first embodiment.

FIG. 3 is a schematic diagram of a drive system of an open-end spinning frame showing a second embodiment of the present invention.

FIG. 4 is a timing chart showing a procedure of a spinning start operation according to the second embodiment.

FIG. 5 is a schematic diagram of a drive system of an open-end spinning frame showing a third embodiment of the present invention.

FIG. 6 is a schematic diagram of a drive system of a conventional open-end spinning frame.

FIG. 7 is a timing chart showing a procedure of a conventional spinning start operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotor 2 ... Spreading roller 3 ... Spinning unit 4 ... Feed roller 5 ... Draw-out roller 6 ... Bobbin 7 ... Winding roller 8 ... Endless belt 9, 10, 11 ... Line shaft 12 ... Inverter 13 ... Control device 14, 15 , 16 ... Clutch 17, 18, 26 ... Sensor A ... Thread reserve mechanism M1, M2, M3, M4 ... Motor

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuyuki Kawai 2-chome, Toyota-cho, Kariya-shi, Aichi Stock company, Toyota Industries Corporation (72) Inventor Kenji Ito 2-chome, Toyota-cho, Kariya-shi, Aichi Stock Company Toyota Loom Works

Claims (4)

[Claims] 1. A plurality of weights each comprising a spinning unit and a feeding / winding system including a feed roller, a drawing roller and a winding roller are arranged in a longitudinal direction of a machine base, and each roller of the winding system is In an open-end spinning machine, which is arranged on each line shaft extending in the longitudinal direction of the machine base and each line shaft is driven by a separate variable speed motor,
When performing splicing and restarting spinning after the machine stand has stopped,
The motor is started in a state where the line shafts of the pull-out roller and the take-up roller are separated from the motors that cooperate with each other by the clutch operation, and both motors are accelerated to a predetermined rotation speed suitable for the yarn splicing operation. When the condition is reached and the ratio between the two has reached a predetermined value, the yarn splicing operation is started, and at the same time, the clutches of the line shafts linked to these two motors are activated to connect them to the motors. The method for activating an open-end spinning machine, wherein the rotational speed of each motor is increased to a steady spinning state while performing feedback control so that the ratio of the rotational speeds of 1) is maintained at the predetermined value. 2. In the open-end spinning machine in which the line shafts of the pull-out roller and the take-up roller are divided into a plurality of blocks in the longitudinal direction via a clutch, all clutches are disengaged prior to starting operation. A method for starting an open-end spinning frame, wherein the method according to claim 1 is performed for each block by sequentially connecting the clutches from blocks on the motor side. 3. A plurality of weights each comprising a spinning unit and a feeding / winding system including a feed roller, a pulling roller and a winding roller are arranged in a longitudinal direction of a machine base, and each roller of the feeding / winding system is arranged. Are arranged on respective line shafts extending in the longitudinal direction of the machine base, and each line shaft is driven by a separate variable speed motor. A clutch connected to the motor that cooperates with each other, means for detecting the rotation speed of the motor, and a ratio of the rotation speeds of both motors based on a detection signal from the detection means,
An open-end spinning machine comprising means for feedback-controlling the rotation speed of the motor so that this becomes a predetermined value. 4. The open-end spinning machine according to claim 3, wherein a flywheel is attached to the motor.