JP2943372B2 - Open-end spinning frame starting method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Generally, an open-end spinning machine comprises a spinning unit including a rotor and an opening roller, a feed roller for supplying a sliver to the opening roller, a drawing roller for extracting a yarn from the rotor, and a winding for drawing the yarn onto a bobbin. A plurality of weights composed of a supply / winding system composed of take-up rollers are arranged in parallel in the longitudinal direction of the machine base.

[0003] The spinning units are arranged along an endless belt, while the rollers of the supply and take-up system are arranged along respective line shafts. In order to easily change the spinning conditions, the endless belt and each line shaft are driven by separate variable speed motors. When the spinning of the open-end spinning machine is stopped simultaneously for doffing, etc., and the spinning is started again, the spun yarn end separated from the fiber bundle in the rotor of each weight at the time of the stop is fixed in the rotor. It is necessary to perform a piecing operation in which the both are fed backward by the length and connected again.

[0004] As one method of this piecing operation, there is a reserve system, in which a yarn portion of a predetermined length reserved in a yarn path between a winding roller and a pull-out roller at the time of stop is released at the time of start-up. After being fed back into the rotor and completely connected again to the fiber bundle deposited on the inner wall of the rotor, the draw-out roller and the take-up roller are started, and the speed of the roller is gradually increased to a normal operation state. Let it be done.

The above-mentioned start-up is performed by, for example, using 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. This is performed by starting from a stopped state according to the procedure described in (1).

[0006]

At the time of such starting, it is necessary that the ratio of the speed between the respective rollers of the winding system is always kept constant. In particular, the speed ratio of the pull-out roller 5 / the take-up roller 7 is important. If this value is smaller than a predetermined value, the yarn tends to be nervous between the draw-out roller and the take-up roller, thereby damaging the yarn quality or tension. Or cut. On the other hand, if this value is too large, the yarn may be loosened during winding, causing package collapse or causing defects such as snare.

However, the load applied to the motor differs greatly between the line shaft carrying the pull-out roller and the line shaft carrying the take-up roller. Therefore, as shown in FIG. The gradient is smaller for the take-up roller. This means that, in the initial stage of the rising period, the tension applied to the yarn becomes abnormally large, and for example, the yarn breakage rate until time T shown in the figure increases.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to provide a method and apparatus capable of smoothly restarting spinning after simultaneous piecing.

[0009]

This object is achieved by arranging a plurality of weights comprising a spinning unit and a supply / winding system including a feed roller, a drawing roller and a winding roller in the longitudinal direction of the machine base. Each roller of the winding system is arranged on a respective line shaft extending in the machine direction,
In an open-end spinning machine in which each line shaft is driven by a separate variable speed motor, when splicing is resumed after stopping the machine base, the line shafts of the pull-out roller and the take-up roller are linked by a clutch operation. Starting the motor in a state separated from the motor,
The two motors are accelerated to a predetermined rotation speed suitable for the piecing operation, and after confirming that this has reached a steady state and the ratio between the two has reached a predetermined value, the piecing operation is started. By operating the clutches of the line shafts associated with these two motors and connecting them to the motors, 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. This is achieved by a method of starting an open-end spinning machine characterized by increasing the speed up to

In another aspect of the present invention, a plurality of weights comprising a spinning unit and a supply / winding system including a feed roller, a drawing roller, and a winding roller are arranged in a longitudinal direction of the machine base. An open-end spinning machine in which each roller of a supply / winding system is disposed on a respective line shaft extending in a longitudinal direction of a machine base, and each line shaft is driven by a separate variable speed motor. a clutch connected to the motor to work the line shaft of the roller and the take-up roller respectively, and the rotational speed detecting means for detecting a rotational speed of said motor, said at startup class
The pitch with a disconnected state, based on the detection signal from the rotational speed detecting means, the rotational speed of the motor is ItoTsugimisao
When the clutch reaches a suitable value,
Further, there is provided an open-end spinning machine characterized by comprising: control means for calculating the ratio of the rotational speeds of both motors and performing feedback control on the rotational speeds of the motors so that the ratio becomes a predetermined value.

[0011]

Before starting the splicing, the motors for driving the pull-out roller and the take-up roller are started with the clutch disengaged, and the respective detecting motors rotate the respective motors to a predetermined rotational speed suitable for the splicing. Make sure you have reached it. In this state, the piecing operation is completed, and at the end of this operation, the clutches of the two motors are operated to connect the line shaft to the motor and rotate the drawing roller and the winding roller. Then, while monitoring the rotational speed by the detecting means, the rotational speed of the motor is increased through feedback control so that the ratio of the two rotational speeds maintains a predetermined value through the control means, and the motor is shifted to a steady operation state.

According to this, the motor for driving the line shafts of the pull-out roller and the take-up roller is rotated 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 on the line shaft is applied to the motor by the clutch being applied at the start of spinning, the ratio of the rotational speeds of the two motors does not collapse, and good winding can be started. Further, this ratio is maintained by feedback control even when the speed of the motor is increased thereafter, and a steady operation state is reached.

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

[0014]

FIG. 1 is a schematic diagram of a drive system of an open-end spinning machine 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 for feeding a sliver S to the spinning unit 3, a pull-out roller 5 for pulling a yarn from the rotor, and a bobbin 6 for a yarn Y. A plurality of sets each including a supply / rewind system including a take-up roller 7 and a plurality of rollers are arranged in the longitudinal direction of the machine base. It should be noted that only one spindle is shown in the figure, and the other is omitted.

The spinning unit 3 is rotatably driven in contact with an endless belt 8 driven by a motor M1, and each roller runs along a line shaft 9, 10, 11 connected to a separate motor M2, M3, M4. They are mounted at a predetermined pitch. An inverter 12 is attached to each of these motors M1 to M4, and the speed thereof is made variable by a command signal from a control device 13 for controlling the operation of the open-end spinning machine. The line shafts 10 and 11 are connected to output shafts m3 and m4 of 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 a clutch 16.
, And can be independently driven / stopped by operating this clutch.

Further, the output shaft m of the motors M1, M3, M4
1, 2 and 3 are sensors 2 for detecting the rotational speed.
6, 17, and 18 are connected to the control device 13 by signals. When the clutch 22 is engaged when the machine stand is stopped, the rack / pinion mechanism 19 moves horizontally between the pull-out roller 5 and the take-up roller 7 to bend the yarn path passing between the pins 20. A reserve mechanism A including a bar 21 for storing a yarn length for piecing is provided. This mechanism is described in Japanese Patent Publication No. 61-20653, etc., filed by the applicant of the present invention, and will not be described in detail.

The procedure of starting spinning after the machine is stopped by this configuration will be described with reference to the timing chart of FIG.
Prior to piecing, the motors M1, M2, M3, and M4 are simultaneously started at a low speed. However, motors M2, M3, M4
Are idled with the clutches 14, 15, 16 disengaged. When it is confirmed by the control device 13 that the rotation speeds of the motors M3, M4, M1 detected by the sensors 17, 18, 26 after a predetermined time have reached a value suitable for piecing, the reserve mechanism A The clutch 22 is disengaged, the thread that has been reserved is released by the action of the spring 23, and the thread is fed back into the rotor 1 that is already rotating, and the splicing is performed.

At the same time, the clutches 14, 15, 16 of the respective line shafts simultaneously enter, and the rollers 4, 5, 6 start rotating. At this time, the motors M3 and M4 of the pull-out roller 5 and the take-up roller 7 have already reached a predetermined rotational speed by idling, so that even if a load is applied by the application of a clutch, rotation disturbance is small, and both rollers are not disturbed. 5,7
Can instantaneously obtain a predetermined rotation speed, and smoothly draw and wind the yarn.

Thereafter, 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. When a command is issued, the rotational speed of the motor is gradually increased proportionally to the value at the time of steady spinning. During this speed increase, the sensors 17, 18, and 26
3, M4 and M1 rotation speeds are monitored.
The control device 13 performs feedback control on the inverter / motor so that the ratio of the rotation speed 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 maintained at a predetermined ratio at which a smooth yarn can be taken up. FIG. 3 is a schematic diagram of a drive system of an open-end spinning machine showing a second embodiment of the present invention. The difference between this embodiment and the first embodiment is 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 clutches 14 'and 15' for each intermediate piece 24, and a predetermined number of blocks are provided in each block 10 'and 11'. And a thread reserve mechanism A common to these weights.

At the start of spinning, as shown in FIG. 4, from the first block closer to the motor to the block farther from the motor, the roller load of each block is sequentially applied to the motor at a low speed according to the above-described procedure. When all the spindles have been started, the speeds of all the motors are simultaneously increased to a steady operation speed. According to this, since the amount of load applied to the motor by one clutch engagement is reduced, the degree of collapse of the ratio of the rotation speed of the pull-out roller / winding roller when the clutch is engaged is greatly reduced.

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

[0023]

As described in detail above, 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 rotational speed. At the start of spinning, a roller load is connected to this by a clutch operation, so that 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 is possible. Will be possible. Furthermore, the rotation speed of both motors or rollers is detected until the steady operation speed is reached, and the speed of the motor is increased while performing feedback control so that this ratio is kept constant. Can be prevented.

[Brief description of the drawings]

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

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

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

FIG. 4 is a timing chart showing a procedure of a spinning start operation based on a second embodiment.

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

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

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 ... Pull-out roller 6 ... Bobbin 7 ... Winding roller 8 ... Endless belt 9, 10, 11 ... Line shaft 12 ... Inverter 13 ... Control devices 14, 15 , 16 ... clutch 17, 18, 26 ... sensor A ... thread reserve mechanism M1, M2, M3, M4 ... motor

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuyuki Kawai 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Kenji Ito 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Co., Ltd. (56) References JP-A-1-132837 (JP, A) JP-B-51-17617 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D01H 4 / 42 D01H 4/48

Claims (4)

(57) [Claims] 1. A plurality of weights each comprising a spinning unit and a supply / winding system including a feed roller, a pull-out roller, and a winding roller are arranged in a longitudinal direction of a machine base. In an open-end spinning machine arranged on each line shaft extending in the longitudinal direction of the machine frame and each line shaft is driven by a separate variable speed motor,
When restarting spinning after splicing after the machine stand stops,
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 motor cooperating with each other by a clutch operation, and both motors are increased to a predetermined rotation speed suitable for the splicing operation. After the state has been reached and the ratio between the two has reached a predetermined value, the piecing operation is started, and at the same time, the clutches of the line shafts associated with these two motors are operated to connect with the motors. Starting the 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 maintains the predetermined value. 2. In the open-end end spinning machine in which a line shaft of a pull-out roller and a take-up roller is divided into a plurality of blocks in a longitudinal direction via a clutch, all clutches are disconnected before starting operation. A method for starting an open-end spinning machine, wherein the method according to claim 1 is performed for each block by sequentially connecting the clutch from a motor-side block. 3. A plurality of weights comprising a spinning unit and a supply / rewind system including a feed roller, a pull-out roller, and a take-up roller are arranged in the longitudinal direction of the machine base, and each roller of the supply / rewind system is provided. 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, wherein the line shafts of the pull-out roller and the take-up roller are provided. A clutch connected to each of the motors associated therewith, a rotation speed detecting means for detecting a rotation speed of the motor, and the clutch in a disengaged state at the time of starting,
Based on the detection signal from the rotation speed detecting means , the motor
When the motor rotation speed reaches a value suitable for the yarn splicing operation.
An open-end spinning machine having a clutch connected, and control means for calculating the ratio of the rotational speeds of the two motors and performing feedback control on the rotational speeds of the motors so that the ratio becomes a predetermined value. 4. The open-end spinning machine according to claim 3, wherein a flywheel is attached to the motor.