JPH07310242A - Method for shutdown in spinning machine and shutdown control unit - Google Patents

Abstract

PURPOSE:To form respective proper numbers of barrel laps and bottom bunches in the frame shutdown for doffing even under a spinning condition of small number of twists in e.g. a ring spinning frame without using a speed variable motor for spindle driving. CONSTITUTION:In conducting a frame shutdown for doffing, top bunches, barrel laps and bottom bunches are formed during the inertial revolution of a spindle driving motor. After the motor is set to inertial revolution, the reopening and re-cutoff of power supply to the motor are made once, respectively, during the lowering of a ring rail from top bunch position to bottom bunch position. When barrel laps are formed, spindle revolving speed is temporarily raised, and the spindle is also maintained in a revolving state during bottom bunch formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stop method and a stop control device for a spinning machine such as a ring spinning machine and a ring twisting machine, and more particularly to at least a body winding (tilt winding) and a bottom bunch during inertial rotation of a motor for driving a spindle. The present invention relates to a stop method and a stop control device at the time of doffing to form (tail roll).

[0002]

2. Description of the Related Art In order to prevent yarn unevenness and yarn breakage, a ring spinning machine keeps a constant relationship between the amount of yarn fed from a draft device, that is, the rotation speed of a front roller and the rotation speed of a spindle. Driven. In addition, in order to ensure that the yarn is automatically wound around the empty bobbin at the time of restarting after changing pipes, the ring rail is lowered to the bottom bunch position when stopping for doffing, and the bottom bunch is located at the spindle base or the bobbin bottom. It is formed.

In addition to a bottom bunch, a top bunch may be formed in some cases in order to facilitate finding in the winder process. When forming the top bunch, when the machine is stopped, the ring rail is first raised to form the top bunch on the uppermost part of the bobbin, and then the bottom bunch is formed.
After the top bunch is formed, the ring rail is lowered to the bottom bunch position at a high speed, and a body winding is formed around the outer circumference of the yarn.

In a ring spinning machine in which a variable speed motor such as a motor controlled by an inverter or a servomotor is used as a motor for driving the spindle, the rotational speed of the spindle during formation of the body wrapping and bottom bunch can be freely changed. Therefore, the number of body wraps and bottom bunches can be set relatively easily.

In a ring spinning machine using a motor (constant speed electric motor) other than a variable speed motor as a motor for driving a spindle, for example, as disclosed in Japanese Patent Laid-Open No. 63-256723, a full pipe and a midway The formation of the body wrapping and bottom bunch, which is the machine stop operation for doffing,
This is performed during inertial rotation of the motor for driving the spindle. The inertial rotation time of the motor is about a dozen seconds to about 20 seconds, depending on the spindle rotation speed during normal operation. Also, when forming a top bunch in addition to the bottom bunch, FIG.
As shown in, the ring rail is raised to the top bunch position PT during the inertial rotation of the motor, and then lowered at a high speed to the bottom bunch position PB, and then the primary raised position PF.
Is raised up to.

The number of body windings and the number of bottom bunches at the time of stopping doffing are important factors for thread cutting at the time of tube replacement. If the number of body windings is too large, the thread cutting will not be performed smoothly. Further, in the case of forming the bottom bunch on the lower part of the spindle, there is a problem that if the number of bottom bunches is too small, the thread cutting is not performed smoothly, and if the number of bottom bunches is too large, the removal process takes time.

The number of body windings is determined by the spindle rotation speed while the ring rail is descending from the top bunch position to the bottom bunch position, the feeding amount (spinning amount) of the fleece from the draft device, and the descending speed of the ring rail. It is difficult to reduce the number of body windings by increasing the descending speed of the ring rail. Therefore, in order to obtain an appropriate number of body windings, the descent of the ring rail from the top bunch position PT is started after the rotational speed of the spindle has considerably decreased, as shown in FIG.

[0008]

The relationship between the spinning amount and the spindle rotation speed is determined by the number of twists, and under spinning conditions with a small twist number, the spinning amount increases even at the same spindle rotation speed. When the number of twists is small, it is necessary to lower the ring rail when the rotational speed of the spindle becomes sufficiently low in order to obtain an appropriate number of body windings. That is, in order to reduce the spindle rotation speed at the time of forming the body winding td when forming the body winding, it is necessary to delay the descent start timing of the ring rail from the top bunch position PT after inertial rotation of the motor, as shown by the chain line in FIG. There is. However, for example, when spinning a yarn thicker than No. 40 or a yarn with a sweet twist, if the ring rail is started to descend when the rotation speed of the spindle has decreased to a speed at which an appropriate number of body windings is obtained, the motor of There is a problem that the inertial rotation time becomes short and the required number of bottom bunches cannot be secured. Further, if the ring rail is started to descend at a spindle rotation speed sufficient to secure the required number of bottom bunches, there is a problem that the number of body windings becomes larger than an appropriate amount.

If a motor whose speed can be controlled by an inverter or the like is used as the spindle driving motor, the above problem can be solved, but the cost becomes high.
The present invention has been made in view of the above problems,
The purpose is a spinning machine that does not use a variable speed motor to drive a spindle, and is capable of forming an appropriate number of body windings and bottom bunches when the machine stand for doffing is stopped even under spinning conditions with a small number of twists. To provide a stop method and a stop control device.

[0010]

In order to achieve the above object, according to the invention of claim 1, at the time of stopping the machine for doffing, at least the body winding and the bottom bunch are caused during the inertial rotation of the spindle drive motor. In the method for stopping a spinning machine to be formed, after the spindle drive motor is inertially rotated, power supply to the spindle drive motor is restarted and re-cut off at least once after a lapse of a predetermined time, and at least at the time of forming the body winding and the bottom bunch. On the other hand, the spindle rotation speed is temporarily increased.

According to the second aspect of the present invention, in the spinning machine, a constant speed electric motor is used as a spindle driving motor, and a spinning machine equipped with a lifting device capable of forming a body and a bunch when the machine stand is stopped. First time measuring means for measuring the time from the start of shutting off the power supply to the motor, second time measuring means for measuring the time from the restart of the power supply to the spindle driving motor, and a machine for doffing. After the spindle drive motor is inertially rotated at the time of stop, a control means is provided for controlling resumption and re-interruption of power supply to the spindle drive motor after a predetermined time has elapsed, based on the signals of the both timing means. .

Further, according to the invention described in claim 3, in the spinning machine, a constant speed electric motor is used as a spindle driving motor and a spinning machine equipped with a lifting device capable of forming a body and a bunch when the machine stand is stopped. Rotating speed detecting means for detecting speed, position detecting means for detecting the position of the ring rail, and body winding and bottom bunch formation based on signals of the rotating speed detecting means and position detecting means when the machine stand for doffing is stopped. A control means for controlling resumption and re-interruption of power supply to the spindle drive motor so that the rotation speed of the spindle is within a predetermined range is provided.

[0013]

According to the first aspect of the present invention, at the time of stopping the machine for doffing, at least the body winding and the bottom bunch are stopped after the power supply to the spindle drive motor is cut off by the start of the stop operation and the inertia rotation occurs. It is formed.
When the spindle drive motor rotates by inertia, the spindle rotation speed gradually decreases from the rotation speed during the normal winding operation. The ring rail is lowered to the bottom bunch position and held at the bottom bunch position when the spindle rotation speed reaches a speed suitable for forming the body winding. A body roll is formed while the ring rail is lowered to the bottom bunch position, and a bottom bunch is formed while the ring rail is held at the bottom bunch position. The power supply to the spindle driving motor is restarted and re-cut off at least once during at least one of the body winding and the bottom bunch. Then, the spindle rotation speed is temporarily increased, and the spindle is reliably held in the rotating state until an appropriate number of bottom bunches are formed.

According to the second aspect of the invention, a constant speed electric motor is used as the spindle driving motor. The first time measuring means measures the time from the start of cutting off the power supply to the spindle drive motor. The second timing means measures the time from the resumption of power supply to the spindle drive motor.
When the machine stand for doffing is stopped, the lifting device performs body winding and bunch operation. After the spindle drive motor is inertially rotated, the control means restarts the power supply to the spindle drive motor based on the output of the first timing means after a lapse of a predetermined time from the start of the cutoff of the power supply. This time is after the start of body winding. Then, the control means again cuts off the power supply to the spindle drive motor after a lapse of a predetermined time from the restart of the power supply based on the output signal of the second timing means. As a result, even if the formation of the body-wrapping is started at the time when the spindle rotation speed becomes sufficiently low, the spindle is reliably held in the rotating state until the completion of the bottom bunch formation.

Also in the third aspect of the invention, a constant speed electric motor is used as the spindle driving motor. When the machine stand for doffing is stopped, the lifting device performs body winding and bunch operation. The rotation speed detecting means detects the rotation speed of the spindle. The position detecting means detects the position of the ring rail. After the spindle drive motor is inertially rotated, the control means controls the spindle drive motor based on the output signals of the rotation speed detection means and the position detection means so that the rotation speed of the spindle falls within a predetermined range when the body is wound and the bottom bunch is formed. Controls resumption and re-interruption of power supply to the.
As a result, even when the spindle rotation speed is set to a sufficiently low speed in order to secure an appropriate number of body windings, the spindle is reliably held in the rotating state until the completion of bottom bunch formation.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 2, the front roller 1 constituting the draft device has a first rotary shaft 1a with a first rotary shaft 1a.
It is rotationally driven via a gear train (not shown) arranged between a gear 2 fitted to the end portion and a driving shaft 3 which is rotationally driven by a main motor M as a spindle driving motor. It is like this. The spindle 4 is rotationally driven via a spindle tape 6 wound around a chin pulley 5 fixed to the driving shaft 3. That is, the front roller 1
Also, the spindle 4 is rotated so that the amount of the fleece fed from the front roller 1 (spinning amount) and the yarn winding amount of the spindle 4 are always the same amount. The rotation speed ratio of the two is set according to the spinning conditions (twist number). A constant speed electric motor is used for the main motor M, and an electromagnetic brake MB is provided.

The lifting device moves the ring rail 8 up and down via the line shaft 7. The line shaft 7 is arranged along the longitudinal direction of the spinning machine base, and screw gears 9 (only one is shown in FIG. 2) are integrally rotatably fitted at predetermined intervals. The ring rail 8 is supported by a plurality of poker pillars 10 (only one is shown in FIG. 2). The poker pillar 10 is movably supported in a vertical direction on a machine frame (not shown), and a screw portion 10a is formed in a lower portion thereof. The screw portion 10a is screwed to a nut body 11 rotatably supported at a predetermined height position of the machine base frame. Nut body 1
A screw gear (not shown) that meshes with the screw gear 9 is integrally formed on the outer periphery of 1. The line shaft 7 is connected to the drive shaft of the servomotor 12 via a gear train (not shown). The servo motor 12 is drive-controlled by the control device 13 via the servo driver 14. The servo motor 12 has a rotary encoder 12a built therein. The rotary encoder 12a constitutes a position detecting means of the ring rail. Line shaft 7 is servo motor 1
It is driven by 2, and the rotation speed and the rotation direction can be freely changed. The line shaft 7, the poker pillar 10, the nut body 11, the servo motor 12, and the control device 13 constitute a lifting device capable of a body winding and a bunch operation when stopped.

The control device 13 also controls the drive of the main motor M, and constitutes a control means for controlling restart and re-interruption of power supply to the main motor when the machine stand for doffing is stopped. As shown in FIG. 3, the control device 13 includes a central processing unit (hereinafter, referred to as a CPU) 15 as a calculation unit and a control unit. The control device 13 includes a program memory 16, a work memory 17, an input device 18, and an input / output interface 1.
9, main motor drive circuit 20a, servo motor drive circuit 2
0b, an electromagnetic brake excitation / demagnetization circuit 21 and a timer 22. The timer 22 constitutes first and second timing means. The CPU 15 operates based on predetermined program data stored in the program memory 16. The program memory 16 is a read-only memory (ROM),
The program data and various data necessary for its execution are stored. The work memory 17 is a readable and rewritable memory (RAM), and temporarily stores data input by the input device 18, arithmetic processing results in the CPU 15, and the like. The input device 18 includes a key switch. The spinning condition data such as the spinning yarn count, the number of twists, the number of rotations of the spindle during the normal spinning operation, the spinning length, the lift length, and the chase length are input by the input device 18. Also, the top bunch position PT, the bottom bunch position PB, the primary rising position P
The stop operation condition data such as F, the top bunch time t1, the bottom bunch time t2, the brake start timing tb, the power resupply time tms, and the power recut time tme are input by the input device 18.

Power resupply time tms, that is, main motor M
The time from when inertial rotation occurs until power is resupplied depends on the spinning conditions and is determined in advance by a test operation. Further, the power re-interruption time tme, that is, the time from the time when the re-supply of power to the main motor M is started to the power re-interruption also differs depending on the spinning conditions and is determined in advance by a test operation.

The CPU 15 is connected to the rotary encoder 12a via the input / output interface 19 and calculates the movement amount and position of the ring rail 8 based on the output signal from the rotary encoder 12a. And the CPU 15
On the basis of this value, the inversion timing of the ring rail 8 is calculated so that the lifting condition input by the input device 18 is satisfied, and the servo motor 12 is drive-controlled via the servo driver 14. Further, the CPU 15 controls the electromagnetic brake MB via the electromagnetic brake excitation / demagnetization circuit 21 for excitation / demagnetization.

A sensor 23 for outputting a pulse signal corresponding to the rotation of the front roller 1 is arranged near the gear 2 and the sensor 23 is connected to the C through the input / output interface 19.
It is connected to the PU 15. The CPU 15 integrates the spinning amount based on the output signal from the sensor 23.

Next, the operation of the apparatus configured as described above will be described. Prior to the operation of the machine base, first, spinning conditions such as the number of twists and stop operation condition data at the time of stop operation are input by the input device 18. During normal operation, the control device 13 drives and controls the servo motor 12 in synchronization with the main motor M according to the spinning conditions input by the input device 18 and stored in the work memory 17. When the servo motor 12 is driven, the line shaft 7 is rotated via the gear train, and the screw gear 9
The nut body 11 is rotated via. Then, the poker pillar 10 screwed into the nut body 11 is moved up or down, and the ring rail 8 or the like is moved up and down. When the servo motor 12 rotates forward, the ring rail 8 and the like are moved upward,
It is moved down during reverse rotation. The yarn Y sent from the front roller 1 is wound around the bobbin B through the snell wire 24 and the traveler 25 sliding on the ring 8a.

When the spinning and winding operations are continued and the integrated spinning amount reaches a predetermined value, the CPU 15 calculates the inertia rotation start timing tFS of the main motor M. The inertial rotation start timing tFS is set based on the bottom bunch start timing tBS as shown in FIG. The top bunch time t1, the top bunch position PT and the bottom bunch position PB are determined, and the ascending speed from the normal winding position to the top bunch position PT and the descending speed of the ring rail 8 when forming the body winding are also determined. Further, the time during which the rotation speed of the spindle 4 decreases to a speed at which an appropriate number of body windings can be formed after the main motor M is inertially rotated due to spinning conditions is stored in the program memory 16 as data. Therefore, the CPU 15 calculates the inertial rotation start timing tFS based on those data and the like. Next, the CPU 15 calculates the position of the ring rail 8 (inertial rotation start position) corresponding to the inertial rotation start timing tFS. Then, when the ring rail 8 reaches the position, the CPU 15 cuts off the power supply to the main motor M via the main motor drive circuit 20a.

As a result, the main motor M becomes inertial rotation,
As shown in FIG. 1, the rotation speed of the spindle 4 gradually decreases. After the main motor M is inertially rotated, the ring rail 8 is moved at a normal ascending / descending speed for a while, and then the ring rail 8 is raised to the top bunch position PT to form a top bunch. The ring rail 8 is held at the top bunch position PT for the top bunch time t1 and then lowered to the bottom bunch winding position PB at a speed much higher than the normal lifting speed. The ring rail 8 is held at the bottom bunch position PT for the bottom bunch time t2, and then raised to the primary raising position PF. Then, when the ring rail 8 is raised to the primary raised position PF, the brake start timing tb is reached, the electromagnetic brake MB is excited, the main motor M during inertial rotation is stopped, and the machine base is completely stopped.

At the time when the ring rail 8 starts descending from the top bunch position, the rotation speed of the spindle 4 is low enough to form an appropriate number of body windings. Therefore, while the ring rail 8 moves from the top bunch position PT to the bottom bunch position PB, an appropriate number of body windings are formed on the outer circumference of the yarn. Since the rotation speed of the spindle 4 at the time of starting the lowering of the ring rail 8 is sufficiently low, unless the main motor M is restarted until the end of the stopping operation, the main motor M is completely stopped before the required number of bottom bunches are formed. . However, the CPU 15 measures the elapsed time from the start of the power supply cutoff to the main motor M with the timer 22, and when the power supply resupply time tms has elapsed, supplies the power to the main motor M again via the main motor drive circuit 20a. To do. Then, the CPU 15 measures the elapsed time from the restart of the power supply to the main motor M with the timer 22, and after the power re-cutoff time tme has elapsed, cuts off the power supply to the main motor M again. Therefore, the main motor M is driven and the rotation speed of the spindle 4 is increased during the power re-cutoff time tme. As a result, the spindle 4 is reliably held in the rotating state even while the bottom bunch is formed, and an appropriate number of bottom bunches are formed while the ring rail 8 is held at the bottom bunch position PB. Since the power re-interruption time tm is set to a value at which the rotation speed of the spindle 4 does not become higher than the speed preferable for forming an appropriate number of body windings, the number of body windings will not be excessive by restarting the main motor M.

Further, when doffing a plurality of spinning machines with one doffing machine (tube changer), at a preset doffing time, the doffing is performed before the yarn is full. May be done. In that case, the CPU 15 drives and controls the servo motor 12 and the main motor M to stop at a predetermined time, as in the case of the full pipe stop.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) While the ring rail 8 is descending, if the change in the rotation speed of the spindle 4 is small, a body winding having a uniform width is formed.
In order to reduce the change in the rotation speed of the spindle 4, it is necessary to restart the power supply to the main motor M while the ring rail 8 is descending, and to suppress the rapid increase in the spindle rotation speed at the time of resupply of power. By supplying power to the main motor M through the reactor circuit, a rapid increase in spindle rotation speed is suppressed as shown by the chain line in FIG. or,
The power supply to the main motor M may be restarted not only during the formation of the body winding, that is, during the lowering of the ring rail 8 from the top bunch position but also during the formation of the bottom bunch.

(2) After the main motor M is inertially rotated when the machine stand is stopped, the power supply to the main motor M may be restarted and cut off again twice or more. For example, in the case of spinning a yarn having a spinning yarn count of less than 10 and having a soft twist, the spinning amount is large even with the same number of spindle rotations, so that the spindle rotation speed appropriate for forming a body winding becomes small. As a result, restarting and re-interruption of the power supply to the main motor M is
In order to hold the spindle 4 in a rotating state until the bottom bunch is formed only once, it is necessary to lengthen the power re-interruption time tme, and the spindle rotation speed may become higher than the appropriate speed. However, by restarting and re-interrupting the power supply to the main motor M a plurality of times, the rotation speed of the spindle 4 can be maintained at an appropriate speed until the bottom bunch formation is completed.

(3) Between the main motor M and the driving shaft 3, a transmission equipped with a stepped pulley and a belt shifter, such as the device disclosed in Japanese Patent Laid-Open No. 61-201028, is provided. The spindle rotation speed during the spinning operation may be variable in multiple stages. In this case, the main motor is not rotated by inertia from the state in which the spindle is rotated at the maximum speed during the stop operation, but the spindle is rotated at a low speed by the transmission and then the main motor is rotated by inertia.

(4) It may be applied to a stopping method in which only the bottom bunch is formed without forming the top bunch at the time of stopping due to full pipe and at the time of stopping doffing on the way. Also in this case, the inertial rotation start timing tFS is calculated based on the bottom bunch start timing.

(5) The moving speed at which the ring rail 8 is moved up and down at the normal winding position after the main motor M is inertially rotated may be different from the normal winding speed.
For example, generally, the speed at the time of descending is higher than that at the time of ascending at the time of winding, but the ascending speed of the ring rail 8 may be the same as the descending speed. In this case, the inertia rotation start timing tFS can be easily calculated.

(6) Instead of the configuration in which the CPU 15 calculates the power re-supply time tms and the power re-cutoff time tme based on the timer 22, respectively, it serves as a first timing means for increasing the time when the power re-supply time tms elapses. A timer and a timer as a second time measuring means that times up when the power re-cutoff time tme elapses may be separately provided.

(7) Rotation speed detecting means for detecting the rotation speed of the spindle 4 is provided, and rotation is performed to detect the rotation speed of the spindle 4 at the time of machine standstill operation, at the time of forming the body winding and at the time of resuming power supply to the main motor M. You may decide based on the detection signal of a speed detection means. As the rotation speed detecting means, for example, the driving shaft 3 is equipped with a rotary encoder. Then, when the ring rail 8 is at the top bunch position PT and the rotation speed of the spindle 4 reaches a speed suitable for forming the body winding, the ring rail 8 starts to descend, and then the rotation speed reaches a predetermined value. At that point, the power supply to the main motor M is restarted. In this case, the body winding timing and the power supply timing to the main motor M can be surely made to correspond to the predetermined spindle rotation speed even if there is a change in the state of decrease in the spindle rotation speed during inertial rotation of the main motor M.

(8) A draft driven by a main motor M as in the device disclosed in Japanese Utility Model Publication No. 6-462 instead of the structure in which the line shaft 7 constituting the lifting device is driven by the servo motor 12. The power of the drive system may be transmitted to the line shaft via the gear box. In this case, during normal spinning, the rotation direction of the line shaft is changed by exciting and deactivating a pair of electromagnetic clutches provided in the gear box. Further, during the stop operation, the ring rail is moved up and down independently of the draft drive system side by the swing motor.

(9) The present invention may be embodied in a spinning machine equipped with a lifting device for moving up and down a ring rail or the like on the basis of swinging by a heart cam. In this case, too, fairness 6-4
Like the device disclosed in Japanese Patent Laid-Open No. 62-62, the ring rail is moved up and down independently of the draft drive system side by a swing motor when the pipe is fully stopped. Therefore, in the case of this configuration, the present invention can also be applied to an existing spinning machine stand that moves a ring rail or the like up and down using a heart cam.

(10) Other than the rotary encoder may be used as the position detecting means of the ring rail. For example, a so-called magnet scale in which a large number of permanent magnets are alternately arranged with their N poles and S poles is arranged in the vicinity of the ascending / descending range of the ring rail, and the detection unit is fixed to the ring rail so as to be movable integrally. A device having a configuration may be adopted. Further, a linear potentiometer may be used as the movement amount detecting means. The rotary encoder may be mounted at any suitable position as long as it is a component that rotates in synchronization with the rotation of the line shaft.

(11) Instead of driving the spindle 4 with the spindle tape 6 wound around the chin pulley 5, it may be driven with a tangential belt. It may also be applied to a ring twisting machine.

Inventions other than those described in the claims that can be grasped from the above-described embodiments and modifications will be described below along with their effects. (1) In the invention described in claim 1, restarting and re-interruption of power supply to the spindle driving motor is performed a plurality of times, and at least once when forming the body winding. In this case, when spinning a yarn with a spun yarn count of less than 10 and a soft twist, the body winding is performed at an appropriate spindle rotation speed, and the spindle rotation speed is maintained at an appropriate speed until bottom bunch formation is completed. it can.

(2) In the invention according to claim 2 or 3, a reactor circuit is provided in a power supply circuit to the spindle driving motor. In this case, it is possible to suppress a rapid increase in the spindle rotation speed at the time of resupply of power, and form a body winding having a uniform width.

[0040]

As described in detail above, the first to third aspects of the invention are described.
According to the invention described in (1), in a ring spinning machine or the like that does not use a variable speed motor for driving a spindle, an appropriate number of body windings and bottom bunches are formed when the machine stand for doffing is stopped even under spinning conditions with a small number of twists. can do.

Further, according to the third aspect of the invention, the body winding timing and the power supply timing to the spindle drive motor can be reliably performed even if there is a change in the lowering state of the spindle rotation speed during inertial rotation of the spindle drive motor. Can correspond to a predetermined spindle rotation speed.

[Brief description of drawings]

FIG. 1 is a diagram showing a change in ring rail position and a change in spindle rotation speed according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a drive system of the same.

FIG. 3 is a block diagram showing an electrical configuration of a control device.

FIG. 4 is a diagram showing a change in ring rail position and a change in spindle rotation speed when a machine stand of the conventional apparatus is stopped.

[Explanation of reference numerals] 1 ... Front roller, 7 ... Line shaft that constitutes a lifting device, 8 ... Ring rail, 12 ... Servo motor that constitutes a lifting device, 12a ... Rotary encoder as position detecting means, 13 ... As control means Control device, 15 ... CP as arithmetic means and control means
U, 22 ... Timer as first and second timing means, M
… Main motor as a spindle drive motor.

Claims (3)

[Claims] 1. A method for stopping a spinning machine for forming at least a body winding and a bottom bunch during inertial rotation of a spindle drive motor when stopping a machine for doffing, after the spindle drive motor is inertially rotated, A stopping method in a spinning machine, wherein power supply to a spindle driving motor is restarted and re-cut off at least once after a lapse of a predetermined time, and the spindle rotation speed is temporarily increased at least during one of formation of a body roll and a bottom bunch. 2. A spinning machine that uses a constant speed electric motor as a spindle drive motor and is equipped with a lifting device that is capable of forming a body and a bunch when the machine stand is stopped, from the start of cutoff of power supply to the spindle drive motor. The first time measuring means for measuring the time, the second time measuring means for measuring the time from the restart of power supply to the spindle drive motor, and the spindle drive motor coasting when the machine stand for doffing is stopped. The stop control device in the spinning machine, comprising: control means for controlling restarting and re-interruption of power supply to the spindle drive motor after a lapse of a predetermined time, based on the signals from the both timing means. 3. A rotation speed detecting means for detecting a rotation speed of a spindle in a spinning machine which uses a constant speed electric motor as a spindle driving motor and is provided with a lifting device capable of forming a body and a bunch when the machine stand is stopped. The position detection means for detecting the position of the ring rail, and the rotation speed of the spindle within a predetermined range at the time of forming the body winding and the bottom bunch based on the signals of the rotation speed detection means and the position detection means when the machine for doffing is stopped. A stop control device for a spinning machine, comprising: a control means for controlling restart and re-interruption of power supply to a spindle drive motor.