JPH04370224A - Method for stopping spinning frame - Google Patents

Abstract

PURPOSE:To prevent snarling from occurring in intermediately stopping a spinning frame such as a ring spinning frame where bobbin change requiring the snarling is carried out during spinning and eliminate yarn breakage in restarting. CONSTITUTION:The first speed reduction gradient setting circuit 34 and the second speed reduction gradient setting circuit 35 are installed and connected in parallel to an inverter 20. When a full package signal is issued from an auto-counter 22, a main motor 4 is decelerated with the inverter by the action of the first speed reduction gradient setting circuit 34 to cause an adequate amount of snarls in stopping. When an intermediate stopping switch 23 is closed during the spinning before the full package, the main motor 4 is decelerated with the inverter by the action of the second speed reduction gradient setting circuit 35. Thereby, the speed of spindles 3 is changed at the second speed reduction gradient which is steeper than the first speed reduction gradient to prevent snarling from occurring.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping a spindle in a spinning machine such as a ring spinning machine or a ring twisting machine.

0002

[Prior Art] Conventionally, as a pipe changing method for spinning machines, when the bobbin becomes full, the ring rail 7 is lowered to the full bobbin 12F.
10a and 10b, and then complete the bobbin 1.
Pull out the 2F, loop the tail winding 10b around the spindle 3, and wind the tail winding 10 between the spindle 3 and the full bobbin 12F.
There is a known method in which the full bobbin 12F is cut off, the full bobbin 12F is discharged to a predetermined take-out position, and the empty bobbin 12 is mounted on the spindle 3 instead (Japanese Patent Application Laid-Open No. 126334/1989, or FIG. 2).

[0003] In this method, as can be seen from FIG. 2(b),
A portion 10d of the end winding loop wound 10c on the spindle 3 between the spindle 3 and the traveler 8 is an empty bobbin 12.
Since the lower end of the snail wire 11 is pushed down during insertion and pulls the lower thread from the snail wire 11, the spindle rotational speed at the time of full tube stop is set so as to create an appropriate slack in the thread to prevent thread breakage, that is, a snarl 25. It was controlled. Then, by inserting the empty bobbin 12, this Snarl 25 was extended and started.

[0004] However, in a spinning machine that performs such a tube change method, even when the machine is stopped in the middle of spinning until the tube is full (hereinafter referred to as "intermediate stop"), the same spindle as when the tube is full is used. As the aircraft was decelerating, the ballooning became loose and a snarl occurred. When the cause of the stoppage is removed and restarted, this snarl 25 inflates the balloon and gets caught in the slab catcher of the snail wire 11.
To prevent thread breakage, lower only the ring rail 7 and unravel the snarl 25 before restarting (Japanese Patent Application Laid-Open No. 63-1999)
No. 190029), or when stopping the machine, the chimney pulley that drives the spindle 3 is suddenly stopped using a brake to prevent the snarl 25 from occurring.

[0005]

Problems to be Solved by the Invention The method of lowering only the ring rail requires a dedicated drive source for raising and lowering the ring rail, so the structure may become complicated. Further, the method of stopping the motor suddenly using the brake is quite effective in preventing the occurrence of snarl, but it is not preferable because it causes severe wear and tear on the brake, and the sudden braking has a negative effect on the bearings in various parts of the spindle drive system.

[0006]

[Means for Solving the Problems] The present invention aims to provide a suitable stopping method for use in spinning machines and the like that perform tube changes as described above. In a spinning machine such as a spinning frame or a ring twisting machine, the first deceleration gradient produces an appropriate amount of snarl between the draft roller and the traveler when the tube is stopped at full capacity, and the snarl is steeper than the first deceleration gradient when stopping in the middle. The present invention is characterized in that the main motor is driven at variable speeds so that the rotational speed of each spindle is reduced at different deceleration gradients that hardly cause any of the above.

[0007]

[Operation] When the pipe is full, the main motor is controlled by the variable frequency power supply at the first deceleration gradient to generate an appropriate amount of snarl, so there is no fear of thread breakage even if the pipe exchange operation as described above is performed. Furthermore, at an intermediate stop during spinning, the rotation of the main motor is controlled at a different deceleration gradient steeper than the first deceleration gradient, so that almost no snarl occurs and there is no yarn breakage upon restart.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a spindle rail 2 of a spinning frame 1 supports a large number of spindles 3 at a predetermined pitch in the longitudinal direction. Each spindle 3 is rotatably driven by a pulley 5 driven by a main motor 4 via a belt 6. 7
8 is a ring rail, 8 is a traveler that can orbit on the ring rail 7, and a draft roller 9 rotated by the main motor 4.
The yarn 10 spun from the snail wire 11 is wound around a bobbin 12 via a traveler 8.

The main motor 4 is an induction electric motor whose drive is controlled via a general-purpose inverter 20 consisting of a variable frequency power supply. Frequency setting terminal a1 of inverter 20
A speed setting resistor r is connected to each of the switches S1 to S3.
Speed setting circuits 30 to 32 are connected in parallel with speed setting circuits 1 to r3 connected in series. Further, an acceleration gradient setting circuit 33 is connected between the acceleration gradient setting terminal a2 and the common terminal a4, in which a contact R1a of an acceleration relay R1, which will be described later, and a resistor VR1 for setting an acceleration gradient are connected in series. Between the deceleration gradient setting terminal a3 and the common terminal a4, a first deceleration gradient setting circuit 34 is connected in series with a resistor VR2 for setting a first deceleration gradient when stopping at full tube and a contact R2a of a first deceleration relay R2; A second deceleration gradient setting circuit 35 is connected in parallel with a resistor VR3 for setting a second deceleration gradient during an intermediate stop and a contact R3a of a second deceleration relay R3 connected in series.

Resistor VR2 of the first deceleration gradient setting circuit 34
The resistance value is set so as to realize the first deceleration gradient DEC1 shown in FIG.
), it is determined in advance by trial spinning that an appropriate amount L1 of the snarl 25 is formed. This snarl 25 is designed to be stretched when an empty tube is inserted due to tube replacement, as will be described later.

Next, the resistor V of the second deceleration gradient setting circuit 35
The resistance value of R3 is set so as to realize the second deceleration gradient DEC2 shown in FIG. It has been determined in advance through trial spinning that when the yarn 10 is stopped, almost no snarl will occur in the yarn 10, as shown in FIG. Incidentally, a plurality of deceleration gradients at this intermediate stop may be provided depending on the number of balls.

A control device 21 is connected to the inverter 20 . An acceleration relay R1, a first deceleration relay R2, and a second deceleration relay R3 are connected to the control device 21, and
The amount of yarn 10 to be spun is determined from the rotation of the front roller 9,
A well-known auto counter 22 that outputs a full signal when the tube is full and a manually operated intermediate stop switch 23 that outputs an intermediate stop signal are connected, and the switches S1 to S3, contact R1a, R2
a and R3a.

The bobbin 12 is inserted into the spindle 3, the inverter 20 is started, and the acceleration relay R1 of the control device 21 is activated.
is excited and the contact R1a of the acceleration gradient setting circuit 33 closes,
Then, the switch S1 is closed and the speed V is increased as shown in FIG.
The spindle rotation speed is increased to 1. Next, switches S2 and S3 are closed in sequence according to the winding amount, and the spindle rotational speed passes through speed V2 and reaches the maximum spinning speed of speed V3.

When some reason for stopping the machine occurs during the spinning operation at speed V3, the operator closes the intermediate stop switch 23. As a result, when the intermediate stop signal is output, the second deceleration relay R3 is energized instead of the acceleration relay R1, its contact R3a is closed, and the main motor 4 starts the second deceleration relay as the spindle rotational speed moves toward zero speed. The inverter decelerates the vehicle at a second deceleration gradient DEC2 set by the gradient setting circuit 35. Since the spindle 3 is rapidly decelerated by the second deceleration gradient DEC2, the spindle 3 acts to apply a brake via the thread 10 to the traveler 8, which tries to continue rotating due to inertia, and the thread 10 is slightly pulled. Therefore, the ballooning becomes small, and almost no snarl occurs due to loosening of the ballooning when stopped. When the machine stop reason is canceled and the machine is restarted, the acceleration relay R1 is energized instead of the second deceleration relay R3, and the spindle 3 is accelerated to the speed V3 through speeds V1 and V2 in the same manner as described above, but the Snarl Since this occurs, there is almost no occurrence of thread breakage. Moreover, since there is no sudden stop using the brakes, there is no wear and tear on the brakes, and there is little negative impact on the spindle rotation drive system.

[0015] Thus, the spinning operation continues at the speed V3, and when the winding amount reaches a full tube, the auto counter 22 outputs a full tube signal. This signal energizes the first deceleration relay R2 instead of the acceleration relay R1, closing the contact R2a and opening the switch S3. As a result, the spindle 3 decelerates toward zero speed at the first deceleration gradient DEC1 set by the first deceleration gradient setting circuit 34. During this deceleration, the ring rail 8 descends, and the full pipe 12F is wrapped with a body wrap 10a and a tail wrap 10b. When it stops, the ballooning loosens and the appropriate amount L1 of Snarl 2 is released.
5 (Fig. 2(a)). Next, when the full tube 12F is pulled out from the spindle 3 using a tube changing device (not shown), the tail end 1
0b is unwound to form a loop winding 10c on the spindle 3, and then the tail winding between the spindle 3 and the full tube 12F is cut. When pulling out the full tube 12F, the buttband 10b is unwound and pulled, and the snarl 25 is partially extended to a length L2 (FIG. 2(b)).

Next, when the bobbin 12 is inserted from above the spindle 3, the bottom wrapper 10d extending between the spindle 3 and the traveler 8 is pushed down by the lower end of the bobbin 12.
As a result, the remaining length L2 of the snarl 25 is almost extended. Then, the machine is started, but Snarl 25
There is almost no thread breakage at this time either.

In this embodiment, the first and second deceleration gradient arrangement circuits 34 and 35 are provided outside the inverter 20. If a function that allows multiple settings is provided, the deceleration gradient may be switched.

Next, another embodiment will be explained with reference to FIGS. 5 and 6. There is only one deceleration gradient setting circuit 35a of the inverter 20,
The resistor VR3 is set so that deceleration between the stepwise speeds described below is performed in the shortest time. The frequency setting terminal a1 of the inverter 20 is connected to the microcomputer 20, which divides the speed from speed V3 to speed zero into n stages, and sets the frequency that realizes each stage of speed VD1 to VDn (speed zero).
a through the D/A converter 28. Further, the inverter 20 is given time T1, t1 by the program of the computer 21a for holding each speed VD1 to VDn and approximating the first deceleration gradient DEC1 and the second deceleration gradient DEC2.

According to such a configuration, the speeds VD1 to V
By dividing Dn into very fine sections and programming to switch between times T1 and t1, the first deceleration gradient DEC1 when the pipe is full and the second deceleration gradient DEC when the pipe is stopped intermediately.
2 can be switched. Furthermore, the computer 21a
The frequencies that realize the speeds VD1 to VDn provided by the motors may be input to the inverter 20 as binary data.

[0020]

[Effect of the invention] As described above, according to the method of this invention,
In a spinning machine such as a ring spinning machine, the deceleration gradient of the spindle rotation speed is changed when the spinning machine stops at full tubes and when it stops at an intermediate stop, and by inverter control, an appropriate amount of snarl is generated when the spinning machine stops at full tubes, and the generation of snarl is prevented when the spinning machine stops at intermediate speeds. As a result, even if the end yarn extending between the spindle and the traveler is pulled by an empty bobbin when changing the tube, the tube can be changed without yarn breakage. Moreover, since almost no snarls occur during intermediate stops, it is possible to prevent yarn breakage caused by the snarls getting caught in the slab catcher even when restarted. Furthermore, since the spindle rotating at high speed is not suddenly braked during an intermediate stop, there is no wear and tear on the brake, and there is no generation of noise or adverse effects on the spindle drive system.

[Brief explanation of the drawing]

FIG. 1 shows an apparatus for carrying out the method of the invention.

FIG. 2 is an explanatory diagram during a pipe exchange operation.

FIG. 3 is a rotational speed diagram of the spindle.

FIG. 4 is a rotational speed diagram of the spindle at an intermediate stop.

FIG. 5 is a diagram showing another embodiment.

6 is a rotational speed diagram of the spindle according to the device of FIG. 5; FIG.

[Explanation of symbols]

1 ring spinning machine, 3 spindle, 4
Main motor, 8 Traveler, 9 Draft roller, 20 Inverter, 22 Auto counter, 23 Intermediate stop switch, 25 Snarl, DEC1 1st deceleration gradient, DEC2 2nd
deceleration gradient

Claims (1)

[Claims] Claim 1: In a spinning machine such as a ring spinning machine or a ring twisting machine that uses a motor driven by a variable frequency power supply as a main motor, a first spinning machine that generates an appropriate amount of snarl between the draft roller and the traveler when the pipe is stopped at full capacity. The main motor is driven at variable speeds so that the rotational speed of the spindle is reduced at a deceleration gradient and at another deceleration gradient that is steeper than the first deceleration gradient and hardly generates the snarl during intermediate stops. How to stop a spinning machine.