JPS63256724A - Production of particular spun yarn - Google Patents

Abstract

PURPOSE:To obtain a spun yarn having desired yarn count and unevenness pattern, by driving a front draft roller with a variable speed motor different from a main motor and correcting the change in the rotational speed of the variable speed motor according to the deviation or variation of the speed from the preset rotational speed of the main motor. CONSTITUTION:A front draft roller 4 separately driven by a servo motor 3 is controlled by an output signal varying with time according to the program stored in a computer 1. Each time a signal is transmitted from a program to generate an unevenness pattern, an operation unit 13 operates the ratio K=v1/v0 (v1 is pulse rate stored in a stationary address and generated by the main motor 11; v0 is preset pulse rate). The result of the operation of multiplied by an output signal generated from the program and the multiplied signal is outputted as an output data. As for the output data interval, a reciprocal of the result is multiplied and outputted.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to, for example, a ring spinning machine, an oven-end spinning machine, a covering spinning machine, etc., by appropriately changing the rotational speed of a front draft roller to improve the speed of spinning. For example, special spun yarn whose thickness is continuously changed (generally,
This relates to the manufacturing method of slub yarns and structuring yarns.

[Prior Art] First, the present inventors proposed a method for obtaining the above-mentioned special spun yarn by independently driving the front draft roller of a spinning machine by a servo motor, and controlling the rotation of the servo motor by a computer. By doing so, we are proposing a method for freely imparting yarn thickness unevenness to the spun yarn (
(Patent Application No. 1986-247386).

[Problems to be solved by the invention] However, in this method, the rotation of the spindle and the back roller are driven by the main motor, which is a completely different drive system from the servo motor that drives the front draft roller. Therefore, when it is necessary to stop for dotting when the tube is full, the inertia of the main motor drive system does not match the inertia of the front draft roller drive system, and most of the yarn breaks, resulting in a slowdown in spinning. When restarting the spinning machine, the spindle of the spinning machine must be reloaded with yarn, resulting in a problem of extremely low production efficiency.

Furthermore, even during startup or steady state operation, the main motor's rotational speed often fluctuates or differs from the set rotational speed. Often, the count and yarn unevenness pattern of the spun yarn are different from the desired ones set in advance, causing problems in terms of quality and production.

In view of the above-mentioned points, an object of the present invention is to configure the front draft roller to be driven independently by a variable motor provided separately from the main motor, and to adjust the rotational speed of the front draft roller. In this method, yarn breakage that occurs when starting and stopping the spinning machine is almost completely eliminated, and the rotational speed of the main motor is controlled by changing the thickness of the yarn as appropriate. The purpose of the present invention is to provide a new method for producing a special spun yarn that can produce a spun yarn with a desired yarn count and unevenness pattern even if there is a problem.

[Means for Solving the Problems] The method for producing a special spun yarn of the present invention that achieves the above-mentioned object has the following configuration.

That is, the front draft roller is configured to be driven independently by a variable motor that is provided separately from the main motor, and the rotation of the front draft roller is appropriately changed under computer control to eliminate special yarn unevenness. In the method of manufacturing spun yarn having the following method, the number of rotations of the main motor or the number of rotations of a system driven by the main motor is constantly detected, the detection signal is input to a computer, and the detected number of rotations is compared with a set number of rotations. This method of manufacturing a special spun yarn is characterized in that the front draft roller control signal from the computer is corrected based on the result.

[Function] Hereinafter, the method for producing the special spun yarn of the present invention will be explained in more detail based on the drawings and the like.

FIG. 1 is a schematic view of the main parts of an example of a spinning machine used to carry out the method for producing special spun yarn of the present invention.

In the figure, in a spinning machine C equipped with a draft section A and a cutting section B, a front draft roller 4 is independently rotated by a servo motor 3 that is controlled by a signal output from a computer 1. With such a mechanism, the front draft roller rotation can be arbitrarily adjusted independently of the main motor, and by appropriately changing the draft magnification, a special thickness uneven pattern can be created in the spun yarn. can be brought about.

2 is a control box. In such a spinning machine, a drive shaft 10 driven by a main motor 11
A chim pulley 7 for transmitting rotation to the spindle 9 is fixed to the spindle 9, and a pattern disk 12 having a number of white and black marks pasted alternately on the side surface of the chimney pulley 7 in the circumferential direction is fixed. , the pattern disk 12
A mark sensor 8 provided opposite the pattern disk 12 detects the rotation of the pattern disk 12 and generates a pulse signal.

In the spinning machine used in the present invention as described above, the spindle 9 driven by the main motor 11, the back roller 6 of the draft section A, and the second roller 5 are in a proportional relationship because they are transmitted through gears and belts. . Therefore, their rotational speed can be determined by the speed of the pulse signal detected by the mark sensor 8 which is a detector.

On the other hand, the draft roller 4 is controlled by an output signal that changes over time according to the programming of the computer 1 in order to be rotated according to the desired unevenness pattern. It is manufactured from special spun yarn with high quality and characteristics.

Here, the speed of the pulse signal detected by the mark sensor described above, that is, the number of pulses per 0.1 second, for example, is stored in a fixed address that is always available, apart from the program that causes the uneven pattern. Attached to the set spindle rotation speed and the number of marks on the pattern disk 12, the pulse speed from the above-mentioned detector is memorized by comparing it with the number of pulses per second, calculated from the number of marks on the pattern disk 12. Always store it in a fixed address different from the address d3<.

The main motor 11 is stored in a fixed address every time a signal is output from a program that causes an uneven pattern.
The ratio of pulse speed V1 and set pulse speed Vo =
Vt/0 is calculated by the arithmetic unit 13, and this oil cylinder result is multiplied by the output signal emitted from the pcogram to be output as output data, and the output data interval (time) is multiplied by the reciprocal. By outputting the rotation speed of the main motor 11, deviations and fluctuations from the set value of the rotation speed of the main motor 11 are corrected, and an uneven pattern corresponding to the signal issued from the setting program is created in the spun yarn. .

Further, when the spinning machine is stopped, the pulse speed v1 of the system driven by the main motor 11 gradually approaches zero, so K also approaches one stroke in proportion to v1. therefore,
The output from the arithmetic unit 13 similarly approaches a pillow, and the front draft roller 4 approaches a stop in conjunction with the system driven by the main motor 11, and finally comes to a stop. As a result, the yarn being spun can be stopped without breaking, and the uneven pattern of the yarn can also be stopped in a state close to the uneven pattern given by the produlum.

Roughly speaking, even when starting up the spinning machine, it is possible to start spinning without yarn breakage and while maintaining most of the uneven pattern state set in the program, and to reach a steady state. becomes possible.

Note that yarn unevenness in spun yarn has two attributes: thickness and length. The thickness is controlled by changing the draft ratio in the draft device, and the length is controlled by the time the state is maintained. Therefore, in the method of the present invention, the ratio of rotation speed to thickness, on the other hand,
The length is corrected by the reciprocal of the duration for the rotational speed. Therefore, it is important that the computer used in the present invention has a corrective function for these two points.

In the explanation of the present invention, an example is shown in which a servo motor is used as a variable motor in the drive system of the front draft roller, but the present invention is not limited to this. In addition, an electromagnetic clutch or a fluid clutch may be interposed between this drive source and the front draft roller, and this clutch may be controlled via the above-mentioned signal.

Further, in the above description, a combination of a pattern disk and a mark sensor is used as a main motor rotational speed detector, but the present invention is not limited to this and can be used with other devices, such as , a means for inputting a voltage signal generated by a tacho generator or the like to a computer using a Δ/D conversion converter may be employed.

The method of the present invention can be applied not only to ring spinning machines but also to A-
It also includes spinning machines such as open-end spinning machines, covering spinning machines, and even mule spinning machines.

[Effects of the Invention] According to the method of the present invention, by correcting and outputting an output signal from a computer according to deviations and fluctuations in the rotation speed of the main motor of the spinning machine, (1) (2) Even if there are fluctuations in the rotational speed of the main motor, a special spun yarn with the desired count and yarn unevenness pattern can be obtained. 3) When multiple spinning machines are operated with the same unevenness pattern setting, it is possible to spin a special spun yarn that approximates the set unevenness pattern even if the actual rotation speed of each spinning machine is different. play.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of an example of a spinning machine used to carry out the method according to the present invention. 1: Computer 2: Motor control VTA 3: Servo motor 4: Front draft roller 5: Second roller 6: Back crawler 7: Chin pulley 8: Mark sensor 9 Nisu spindle 10 Ni drive shaft 11: Main motor 12: Pattern disk 13: Stop machine A Nidraft part B: Kanen part C: Fine spinning book

Claims (3)

[Claims] (1) The front draft roller is configured to be driven independently by a variable motor provided separately from the main motor, and the rotation of the front draft roller is appropriately changed under computer control to prevent special yarn unevenness. In the method of manufacturing a spun yarn having A method for producing a special spun yarn, characterized in that the front draft roller control signal from a computer is corrected based on the comparison results. (2) Manufacturing the special spun yarn according to claim (1), wherein the front draft roller control signal from the computer to be corrected is a data value and an output data interval output by the computer. Method. (3) When detecting the rotational speed of the main motor or the rotational speed of the system driven by the main motor and inputting the detection signal to the computer, the rotational speed is detected by a mark sensor and the pulse signal is used to detect the rotational speed of the system driven by the main motor. A method for producing a special spun yarn according to claim 1 or 2, characterized in that the method is configured to perform input to a computer.