JPH1037033A - Operation of drawing device in fiber machine and drawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for operating a drawing device in a fiber machine, enabling to surely hook any fiber without relating to the property of the fiber and a drawing condition and further enabling to reoperate the device without breaking the fiber in the fiber-hooked state by controlling the rotation speeds of plural rollers disposed in a fiber travel direction at a specific ratio. SOLUTION: A processor-controller(PC) 60 for controlling the invertors 10, 20, 30 of roller-driving systems for feeding, drawing and taking the fiber, respectively, is connected to the graphic terminal 70 of an input means through a communication line 80. Such the main-subordinate relations as the downstream side is main on the starting and accelerating treatments of the device and as the upstream side is main on the speed-reducing and stopping treatments of the device are set between the rollers, and the subordinate speed is controlled on the basis of the main speed in such a ratio that the output response retardation of the subordinate speed does not cause the looseness of the fiber. The operation method can also easily correspond to the change of the fiber into the other kind of the fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretching apparatus for a textile machine which stretches a yarn made of a thermoplastic synthetic fiber between rollers having different peripheral speeds, and then relaxes and heat-treats the yarn between the most downstream rollers. And a stretching apparatus.

[0002]

2. Description of the Related Art Normally, when an undrawn or semi-drawn yarn of nylon or polyester is drawn, it is cold drawn or hot drawn between a supply roller and a drawing roller, and then drawn with a drawing roller to ensure dimensional stability. Heat treatment is performed in a relaxed state between the take-off rollers. In other words, the yarn becomes a practical yarn through two steps of a drawing step and a heat treatment step in the drawing apparatus.

[0003] Recently, diversification and differentiation of yarns have led to general production of many kinds and small quantities. Frequently, the kinds of production are changed, and various conditions such as the draw ratio of the yarn are changed each time.
For this reason, in the conventional stretching apparatus, change gears requiring complicated replacement work are eliminated, each roller is directly connected to a motor so that the set speed can be easily changed, and an inverter is provided for each motor to electrically connect the rollers. The rotation speed was controlled.

[0004]

If the motor directly connected to each roller is simply controlled and the peripheral speed of each roller in the steady state is individually set as in the conventional machine, there is no relationship between the rollers. At the time of starting and stopping, the speed ratio between the motors cannot be accurately controlled under conditions suitable for the yarn. For this reason, between the rollers, the yarn may be loosened and wound around the roller on the upstream side to break the yarn. In particular, between the rollers in the relaxed state, the relaxation magnification became larger and the yarn was frequently broken.

Further, even if all the motors are to be started at the same time, the start-up of each motor varies to a small extent because the output response delay is slightly caused by the difference in the processing time of the control program related to each motor. For this reason, in the case of restarting with the yarn hooked, if the start of the upstream roller is slightly earlier than that of the downstream roller, the yarn loosens and winds around the upstream roller to break the yarn. The broken thread had to be manually threaded again, which was a very troublesome operation. In the case of manufacturing a completely new yarn type, it has been necessary to determine the operating condition that minimizes yarn breakage by trial and error in relation to the heater temperature in consideration of the above-described problem.

Therefore, the present invention can easily cope with the change of the production type, and can surely hook any yarn irrespective of the properties of the yarn and the drawing conditions. An object of the present invention is to provide a method of operating a drawing apparatus and a drawing apparatus in a textile machine that can be restarted without breaking.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of operating a drawing machine in a textile machine which stretches a yarn and heat-treats it in a relaxed state. The speed ratio between the rollers is accurately controlled to the set value, and even if there is an output response delay in any of the roller driving devices, the delay is absorbed as tension to prevent the yarn from becoming loose and the yarn breaks. It is to try to prevent.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of rollers are arranged in the running direction of a yarn, and the speed of each roller is individually controlled to draw the yarn into a relaxed state after drawing. A master-slave relationship is set between each roller so that the downstream side is main during start-up acceleration and the upstream side is main when stopping and decelerating. The secondary speed is ratio controlled. During a steady operation, the master-slave relationship between the rollers is released.

In order to carry out the operation method as described above, a plurality of rollers are arranged in the running direction of the yarn, and the yarn is stretched and relaxed according to the speed difference between the rollers to perform a heat treatment. Drive means for individually rotating the rollers, input means for inputting the speed ratio between the rollers and the time required for acceleration and deceleration of the rollers, and a master-slave relationship between the rollers which can be released and the input Control means for controlling the ratio of the driving means of the main roller to the driving means of the slave roller based on the speed ratio inputted to the means, and a common means between the respective means so that signals can be transmitted and received mutually. Connect with a communication line. It is preferable that the control means can change the speed ratio between the rollers even during operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 schematically shows one weight of a two-stage stretching apparatus according to the present invention, in which a yarn Y unwound from an unstretched package passes through a supply roller 1, a stretching roller 2, and a take-off roller 3. And wind it up on a winding device (not shown). In the production stage, the yarn Y nipped by the supply roller 1
Is stretched between a stretching roller 2 having a higher peripheral speed than the roller. The stretching roller 2 is a heating roller, and is controlled at an optimum temperature to heat the yarn. Then, the drawn yarn Y
Is heat-treated between the stretching roller 2 and the take-up roller 3 in the relaxed state, passing through the heater 5 disposed therebetween.

Each of supply, stretching and take-off rollers 1, 2,
3 is driven by respective drive systems 10, 20, 30. In each drive system, a motor M for driving a roller and an inverter INV for rotating the motor are provided. Further, a pulse generator PG is connected to the motor M, and the detected value is fed back to the inverter INV to control the rotation speed of the motor M with high accuracy. A braking unit S is provided so as to be able to stop more quickly.

As shown in FIG. 2, the inverter I of each of the supply, stretching and take-off roller drive systems 10, 20, 30 is provided.
The NV, an arithmetic processing unit (hereinafter, referred to as a PC) 60 for controlling the roller drive system, and a graphic terminal 70 for inputting various conditions are connected via a common serial communication line 80 to reduce wiring. Transmission and reception. The graphic terminal 70 is used to input operating conditions such as the yarn speed, the stretching or relaxation ratio between rollers, the time required for rising and falling, and the temperature of the heater. In addition, a start / stop switch and the like are provided. Various input conditions are obtained by transmitting data input from the graphic terminal 70 to the PC 60 and calculating the input conditions based on the data by using a previously stored formula. The calculated value is transmitted to each drive system as a speed command to the inverter INV, and the motor M connected to the inverter is rotated. Further, a signal indicating a situation from each drive system is fed back to the graphic terminal 70, and the operation state is displayed on an attached monitor in real time.

The PC 60 is capable of releasing the master-slave relationship between the two rollers.

The PC 60 is provided with each roller drive system 10, 2
A master-slave relationship is set between 0 and 30.
A signal relating to the speed is fed back from the main inverter to the PC, and a value calculated based on the signal so as to have a preset speed ratio is transferred to the slave inverter. When the stretching device is started and accelerated, the downstream roller is the main roller and the upstream roller is the slave, and when the deceleration is stopped, the upstream roller is the main and the downstream roller is the slave, and follows the acceleration and deceleration of the main. To maintain a constant speed ratio. In this way, the ratio of each roller is controlled so as to maintain a constant speed ratio.

Further, the PC 60 can be set so as to change the speed ratio between the master and the slave during operation, and when the stretching or relaxation ratio and the time required for changing the ratio are input from the graphic terminal 70, the data and the main speed are changed. Based on the speed, a sub-drive condition is calculated by a calculation formula stored in advance, and the calculated value is set to be transmitted from the PC.

The temperatures of the heater 5 and the heating roller 2 are controlled by a PC 60 by another circuit (not shown).

When the stretching apparatus having such a configuration is started, when the PC 60 is started and accelerated, the downstream taking-up roller 3 is mainly used between the stretching and taking-up rollers 2 and 3, and the upstream-side stretching roller 2 is used as a slave. Is set as follows. Also, between the supply and stretching rollers 1 and 2, the downstream stretching roller 2 is set as the main and the upstream supply roller 1 is set as the slave.

Various operating conditions are set on the graphic panel 70.
When the data is input, the data is transmitted to the PC 60, and the PC forms the operation pattern of each roller as shown in FIG. FIG. 3 shows the relationship between the peripheral speed and the time of the stretching roller 2 and the take-up roller 3, and the drive system of each roller is controlled so as to follow this diagram. Here, in the production stage, the stretching portion between the stretching roller 2 and the take-up roller 3, which is a relaxation portion, is slightly stretched so as to apply tension during start-up acceleration and stop deceleration. Note that a constant stretching ratio may always be provided between the supply roller 1 and the stretching roller 2.

The operation of the stretching and take-off rollers 2 and 3 of this embodiment will be described with reference to the diagram of FIG. 3. First, when an activation signal is input to the stretching device, each roller is driven at a speed based on the set stretching ratio. It is accelerated while maintaining the ratio constant (OT1). Once in a low speed range, all rollers are operated at a constant speed, and a thread hooking operation is performed (T1-T2). here,
Since an appropriate tension is applied to the running yarn, there is no fear of yarn breakage. Even if the yarn breaks, the drawing condition between T1 and T3 can be changed by once returning to the state of T1 and inputting the speed ratio, so that the optimum condition can be easily found. When the re-acceleration signal is input after the threading operation is completed, each roller is further accelerated while maintaining the speed ratio constant again (T2-T3). Take-off roller 3
Reaches a steady operation speed S4 (T3), the speed ratio of the stretching roller 2 to the take-up roller is changed to a predetermined ratio over a preset time, so that the speed of the stretching roller is accelerated from S3 to S5. The yarn Y gradually becomes in a relaxed state. Here, it is set in advance so as to require a time not to break the thread (T3-T4).

The temperatures of the heater 5 and the heating roller 2 have been heated to a predetermined temperature before the point T4, and substantial production starts from this point. During the steady operation, the above-described master-slave relationship between the rollers is released, and the rollers are individually controlled by the PC 60 so as to maintain the predetermined speed (T4-T).
5). If it is necessary to change the stretching or relaxation ratio even during operation, a master-slave relationship is set between the rollers as described above, and the ratio is controlled between the master and slave to change the speed ratio.

When a full signal is transmitted from a winding device (not shown), in order to stop the machine in the PC 60, the upstream stretching roller 2 is the main and the downstream taking roller, contrary to the master-slave relationship at the time of startup. 3 is set to be subordinate. After the main take-off roller is decelerated from S5 to S3 to make it into the stretched state (T5-T6), each roller is decelerated while maintaining a constant speed ratio, and the machine is completely stopped. (T6-T7). Since an appropriate tension is applied to the yarn Y between the take-up roller 3 and the stretching roller 2, the yarn Y can be stopped without breaking.

Next, when the machine is restarted with the thread applied, the take-up roller 3 becomes the main again, the drawing roller 2 becomes the sub-roller, and the sub-roller is accelerated by controlling the ratio of the sub-roller to the main roller. Even if the stretching roller at the moment of starting is slightly delayed due to a delay in output response, the yarn is in a direction in which tension is applied to the yarn, so that the yarn can be restarted without loosening and yarn breakage. Further, even when the yarn is continuously heated by the heater when the stand is stopped and the shrinkage ratio is reduced, the yarn is not broken because the start-up is accelerated in the stretched state. In this embodiment, the relaxing portion between the stretching roller and the take-off roller is slightly stretched at the time of starting acceleration and at the time of stopping and decelerating.

Similarly, a master-slave relationship is set between the supply roller 1 and the stretching roller 2.

The present invention is not limited to the present embodiment, and may be applied to a multi-stage drawing machine or a fiber machine having a drawing and relaxing device such as a drawing false twisting machine as shown in FIG. .

[0025]

As described above in detail, the present invention controls the ratio of the upstream roller to the downstream roller during startup acceleration, and conversely controls the ratio of the downstream roller to the upstream roller during stop deceleration. By doing so, it is possible to apply the optimum tension to the yarn at the time of yarn hooking and at the time of restarting the stop, so that it is possible to provide a drawing device that does not break the yarn even if any yarn is used. Play. In addition, since it is possible to easily change the stretching or relaxation conditions between the rollers even during operation, it is possible to find out a condition under which the yarn is not easily broken even if the stretching condition is unknown. To play.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a configuration of an embodiment of a stretching apparatus for carrying out the present invention.

FIG. 2 is a schematic diagram showing connection of a communication line in the embodiment of FIG.

FIG. 3 is a graph showing a driving operation pattern of a stretching roller and a take-off roller.

FIG. 4 is a schematic view showing one embodiment of a draw false twisting machine for carrying out the present invention.

[Explanation of symbols]

 INV Inverter M Motor Y Yarn 1 Supply roller 2 Drawing roller 3 Take-up roller 10 Supply roller drive system 20 Drawing roller drive system 30 Take-up roller drive system 60 Arithmetic processing unit (PC) 70 Graphic terminal 80 Serial communication line

Claims (3)

[Claims] A plurality of rollers are arranged in the running direction of the yarn, and the speed of each roller is individually controlled to draw the yarn into a relaxed state after drawing, and when operating a drawing device in a textile machine for heat treatment, In the meantime, a master-slave relationship is set such that the downstream side is mainly used during startup acceleration and the upstream side is mainly used during stop deceleration,
A method of operating a drawing apparatus in a textile machine, wherein a ratio of a secondary speed to a main speed is controlled so that a secondary output response delay does not cause slack of a yarn. 2. A drawing apparatus for a textile machine in which a plurality of rollers are arranged in a running direction of a yarn and the yarn is stretched and then heat-treated by a speed difference between the rollers, and each roller is individually rotated. An input means for inputting a speed ratio between the respective rollers and a time required for acceleration and deceleration of the respective rollers; and a speed ratio which is capable of releasing the master-slave relationship between the respective rollers and which is input to the input means. And control means for controlling the ratio of the driving means of the main roller to the driving means of the subordinate roller based on the control means, and each means is connected by a common communication line so that signals can be transmitted and received mutually. A drawing apparatus in a textile machine, characterized by the following. 3. The drawing apparatus according to claim 2, wherein the control means can change the speed ratio between the rollers during operation.