JPH10212627A - Driving control of draw-twister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for carrying out driving control of a draw- twister, capable of suppressing facility cost and reducing product cost. SOLUTION: In drawing undrawn yarn by using plural draw-twisters carrying out drawing by delivery roller, delivery motors of delivery rollers of plural draw-twisters are connected to one inverter 6 and when threading operation is carried out or drawing is finished, number of revolutions of delivery rollers are controlled by the inverter 6 and in stationary operation other than above operations, the delivery motors are directly connected from the inverter 6 to a commercial electric source A and delivery rollers are operated by a definite number of revolutions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the driving of a drawing and twisting machine when a plurality of drawing and twisting machines for drawing and winding an undrawn yarn are used.

[0002]

2. Description of the Related Art Synthetic fibers such as polyester have been widely used in which unspun spun yarn is drawn by a drawing and twisting machine. Conventionally, a structure of a drawing and twisting machine generally used and a drawing method will be described. FIG.
1 is a schematic view showing the structure of a single drawing and twisting machine. The undrawn yarn wound in the spinning process passes through a nip roller 9 and is supplied to a drawing zone including a first delivery roller 10 and a second delivery roller 11 for stable supply, and is drawn by a difference in rotation speed between the two rollers. Is done. The drawn yarn passes through a ring rail 12 and is wound up and down uniformly on a pan 14 by rotating a spindle 13.

A nip roller 9, a first delivery roller 10,
The driving force of the second delivery roller 11 is transmitted by one delivery motor 2, but the number of rotations can be made different by using the gear 15. The rotation speed of the spindle 13 is given a driving force by the spindle motor 3 and controlled by a dedicated inverter. And Pan 14
Since the tension is increased as the yarn is wound up and becomes thicker, the rotational speed is controlled to be gradually decreased in order to keep the tension constant and prevent the yarn breakage.

FIG. 4 is a schematic explanatory view showing a conventional drive control method for such a drawing and twisting machine. Each of the plurality of drawing and twisting machines 1a to 1c has a delivery motor 2a to 2c,
Spindle motors 3a to 3c are provided. Since the rotation speeds of the delivery rollers 10 and 11 are determined by the gear 15, the delivery motors 2a to 2c are not controlled, and a cable is directly connected from the commercial power supply A. The spindle motors 3a to 3c are usually connected to dedicated inverters 4a to 4c because they must be controlled by changing the number of revolutions of the spindle 13 according to the winding diameter of the pan 14. The inverters 4a to 4c are connected in parallel from cables of the delivery motors 2a to 2c.

[0005] Recently, in order to improve the safety and the quality of the product at the time of the threading operation, and to reduce the waste portion, the delivery roller is used at the time of the threading operation and at the end of the drawing.
It is necessary to control the rotation speeds of the motors 10 and 11, and a drive control method is adopted that uses the inverters 5a to 5c as shown in FIG. 5 and enables the rotation speeds of the delivery motors 2a to 2c to be controlled. Have been.

FIG. 5 shows the delivery motors 2a to 2a.
It is a schematic explanatory drawing which shows the drive control method of the drawing twisting machine which can control the rotation speed of 2c, and the inverters 5a-5c for delivery motors are provided. The delivery motor inverters 5a to 5c are connected by a cable from the commercial power supply A, and the spindle motor inverters 4a to 4c are connected in parallel by the cable.

However, such a method can improve the safety and the quality of the product at the time of the threading operation, and can reduce the waste portion. However, since a large number of inverters are required, a large investment is required, and the product cost is reduced. Is high.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, improves the safety at the time of threading work, improves the quality of a product, reduces the amount of waste, and reduces equipment costs. An object of the present invention is to provide a drive control method for a drawing and twisting machine that can reduce product cost.

[0009]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have reached the present invention. That is, in the present invention, when performing drawing using a plurality of drawing and twisting machines that perform drawing by a delivery roller, the delivery motors of the delivery rollers of the plurality of drawing and twisting machines are connected to one inverter, and during the yarn hooking operation and during drawing. At the end of the operation, the inverter controls the number of rotations of the delivery roller. At other times, during normal operation, the inverter is directly connected to the commercial power supply to operate the delivery roller at a constant number of rotations. The gist is a method.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic explanatory view showing one embodiment of a drive control method for a draw twisting machine according to the present invention. Drawing and twisting machine 1
a to 1c are respectively connected to a commercial power supply A. The commercial power supply A is connected by cables to delivery motors 2a to 2c when the delivery roller is in a steady operation and inverters 4a to 4c for controlling the spindle motors 3a to 3c. It is connected. The cables connected to the delivery motors 2a to 2c have contacts 7a to 7c. Further, a common inverter 6 for controlling the plurality of delivery motors 2a to 2c is provided. The inverter 6 is connected by a cable from another commercial power supply B, and has contacts 8a to 8c.
8c and contacts 7a-7 through delivery motors 2a-2c
c is connected to the cable.

[0011] Then, during the steady operation of the delivery roller,
The contacts 7a to 7c are turned on, the contacts 8a to 8c are turned off, and the delivery motors 2a to 2c are directly connected to the commercial power supply A to rotate the delivery motors 2a to 2c at a constant speed. At the time of threading work of the delivery roller and at the time of completion of drawing, the contact 7a
7c are turned off, the contacts 8a to 8c are turned on, the delivery motors 2a to 2c are connected to the inverter 6, and the rotation speeds of the delivery motors 2a to 2c are controlled.

Next, a description will be given with reference to a graph shown in FIG. 2 showing the time change of the rotation speed of the delivery motor and the spindle motor. (A) shows a delivery motor, and (b) shows a spindle motor. First, it begins to rotate the spindle motor 3a draw twister 1a, upon sensing the rotation time T _1, Deriberimota 2a starts to rotate. At this time, the spindle motor 3a is controlled by the inverter 4a, and the delivery motor 2a is controlled by the inverter 6, and is rotated at a low speed to perform the thread hooking operation. Time T at which the threading operation has been completed
After a _two to raise the rotation speed of the Deriberimota 2a in the inverter 6 until a steady state, the contact 8a becomes a steady operating state at time T ₃ is turned off, so that the contacts 7a is turned on. As a result, the power supply of the delivery motor 2a is switched from the inverter 6 to the commercial power supply A, and thereafter rotates at a constant speed. When the stretching is completed, the delivery motor 2a is again controlled by the inverter 6, and the delivery roller is rotated at a low speed.

On the other hand, the spindle motor 3a operates at time T ₃
Thereafter, raised at time T ₄ to a value of rotational speed are controlled by inverters 4a of the spindle motor 3a, thereafter gradually decreasing gradually the rotational speed so as to keep constant the tension of the yarn wound into the pirn, The final product.

When the drawing and twisting machine 1a is controlled as described above, the inverter 6 is not connected to the delivery motor 2a and does not control anything during the steady operation of the drawing and twisting machine 1a. The drawing and twisting machines 1b and 1c can be controlled by the inverter 6, and the other drawing and twisting machines 1b and 1c can be controlled.
It is possible to carry out the thread hooking operation of b and 1c and the operation of finishing the drawing. As described above, by performing the yarn hooking operation of a plurality of drawing and twisting machines and the operation while shifting the drawing end timing, each delivery motor can be controlled by one inverter.

Further, as described above, in addition to controlling the threading timing of each of the plurality of drawing and twisting machines to be in order, among the plurality of drawing and twisting machines, the threading operation and the end of drawing are performed. If there are several draw-twisting machines to be performed at the same timing, the delivery motors of these draw-twisting machines may be simultaneously controlled by the inverter 6. For example, in the case where the drawing and twisting machines 1a and 1b are threaded at the same timing, the contacts 7a and 7b are turned off and the contacts 8a and 8b are turned on simultaneously, and the contacts other than the contacts 8a and 8b such as the contact 8c are turned off. And the delivery motor 2 of the drawing and twisting machine 1a, 1b
By controlling only a and b by the inverter 6 at the same time, the thread hooking operation can be performed simultaneously. Then, while the drawing and twisting machines 1a and 1b are operating in a steady state, the yarn hooking operation and the finishing operation of the other drawing and twisting machine 1c and the like are performed.

[0016]

According to the drive control method of the draw-twisting machine of the present invention, the rotation speed of the delivery motors of a plurality of draw-twisting machines can be controlled by one inverter. Product quality can be improved, waste can be reduced, and equipment costs can be reduced.
As a result, it is possible to reduce the product cost.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of a drive control method for a draw twisting machine according to the present invention.

FIG. 2 is a graph showing a time change of the rotation speed of a delivery motor and a spindle motor.

FIG. 3 is a schematic view showing an embodiment of the structure of the drawing and twisting machine.

FIG. 4 is a schematic explanatory view showing a drive control method of a conventional drawing and twisting machine.

FIG. 5 is a schematic explanatory view showing a drive control method of a conventional drawing and twisting machine.

[Explanation of symbols]

 1a, 1b, 1c drawing and twisting machine 2a, 2b, 2c delivery motor 3a, 3b, 3c spindle motor 4a, 4b, 4c spindle motor inverter 5a, 5b, 5c delivery motor inverter 6 inverter 10 first delivery roller 11 second delivery roller 12 ring Rail 13 spindle A, B Commercial power supply

Claims (1)

[Claims] When a plurality of draw-twisting machines are used for drawing by a delivery roller, the delivery motors of the delivery rollers of the plurality of draw-twisting machines are connected to a single inverter, so that the yarn can be drawn and the drawing operation can be completed. A drive control method for a drawing and twisting machine, characterized in that the rotation speed of the delivery roller is controlled by an inverter during normal operation, and that during normal operation, the delivery roller is operated at a constant rotation speed by directly connecting the inverter to commercial power. .