JPH1037034A - Operating method of multi-stage drawing machine in textile machine - Google Patents

Abstract

(57) [Problem] To minimize the load applied to a roller driving means, so that any yarn can be set regardless of drawing conditions. SOLUTION: A draw ratio between each roller is set to a tentative speed ratio for applying an appropriate tension to the yarn at the time of starting acceleration and stopping and deceleration, and when the ratio is shifted from the tentative ratio to the ratio of steady operation. In addition, when shifting from the ratio of the steady operation to the temporary ratio, the distance between the rollers is sequentially changed to a predetermined ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber in which a yarn made of a thermoplastic synthetic fiber is stretched in multiple stages by a peripheral speed difference between a plurality of rollers arranged in the running direction of the yarn and subjected to a relaxation heat treatment as required. The present invention relates to a method for operating a multi-stage stretching apparatus in a machine.

[0002]

2. Description of the Related Art In general, when drawing an undrawn or semi-drawn yarn of polyester, firstly, the yarn is slightly pre-drawn and subjected to main drawing by applying heat. Then, heat treatment is performed in a relaxed state to ensure dimensional stability, followed by cooling. In the field of industrial materials, high strength, low elongation and low shrinkage yarns are required,
The main stretching may be performed in two stages and the stretching may be performed greatly. In the case of nylon yarn, cold drawing is sufficient and preliminary drawing is unnecessary.

As described above, in recent years, diversification and differentiation of yarn have been demanded, and various conditions in production differ depending on the type of yarn hooking, and drawing conditions are changed each time. For this reason, there is a demand for a recent stretching apparatus capable of easily changing the stretching conditions for high-mix low-volume production. Therefore, the conventional stretching apparatus eliminates a change gear that requires complicated replacement work, directly connects each roller to a motor so that the set speed can be easily changed, and arranges an inverter for each motor to electrically connect the rollers. The rotation speed was controlled.

[0004]

In the conventional machine, each roller is controlled by an independent drive system, and the peripheral speed of each roller is individually set so as to have a predetermined stretching ratio between the rollers. There is no relationship between the driving systems.At startup, in addition to the load due to acceleration, the load due to stretching or loosening of the yarn is applied, and depending on the position of the roller, the load becomes excessive, and an extremely large-capacity motor or inverter is required. . In addition, if the capacity is insufficient, there is a problem that the stretching or relaxation ratio differs from the set value and the yarn breaks. For this reason, the conditions for stretching or relaxing are limited, and the type of the device yarn is very limited. In addition, since the load due to the stretching or loosening of the yarn is applied in addition to the load due to the brake at the time of stopping, there is a problem that the time required for the stop is long and the loss of the yarn increases.

Accordingly, the present invention provides a method of operating a drawing apparatus in a textile machine which can minimize any load on a roller driving means and can set any yarn regardless of drawing conditions.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a stretching and relaxing ratio between respective rollers, which is a provisional speed at which a proper tension is applied to a yarn at the time of starting acceleration and stopping and deceleration. When the ratio is changed, the transition between the rollers is sequentially changed to a predetermined ratio when the transition from the temporary ratio to the steady operation ratio and when the transition from the stationary operation ratio to the temporary operation ratio is performed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of rollers are arranged in the running direction of a yarn, and the yarn is stretched in multiple stages by a peripheral speed difference of each roller.
In the operation method of the multi-stage drawing apparatus in the textile machine which performs relaxation heat treatment as needed, a roller driving means for controlling the ratio of the peripheral speed of the rollers between the rollers is provided, and the temporary speed ratio is maintained between the rollers at startup acceleration. After the rollers on the most downstream side reach the set speed, the speed between the rollers is sequentially shifted to a predetermined speed ratio.

During stop deceleration, the speed ratio between the rollers is sequentially switched to a temporary stretching ratio with reference to the uppermost stream side roller, and then the speed is reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 schematically shows one weight of a three-stage stretching apparatus in which a large number of weights are continuously provided. When the undrawn polyester yarn is drawn by this drawing device, the yarn Y unwound from the package in the production stage is nipped by the supply roller 1 and firstly the first drawing roller 2 having a slightly higher peripheral speed than the supply roller. And the main stretching is performed between the first stretching roller 2 and the faster second stretching roller 3. The two stretching rollers 2 and 3 are heating rollers, each of which is heated to an optimum temperature and assists in stretching the yarn. The stretched yarn Y passes through the heater 5 disposed between the second stretching roller 3 and the take-up roller 4 in the relaxed state, is heat-treated, and is cooled by the take-up roller 4. After that, it is wound up by a ring-type winding device (not shown).

The supply, stretching and take-off rollers 1, 2,
Drives 3 and 4 are driven by respective drive systems 10, 20, 30, and 40. Each drive system is provided with a motor M for driving rollers and an inverter INV for rotating the motor. 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. In particular, a circuit capable of power regeneration may be provided for energy saving.

As shown in FIG. 2, an inverter INV for each of the roller drive systems 10, 20, 30, and 40 for supply, stretching, and take-off, an arithmetic processing unit (hereinafter, referred to as PC) 60 for controlling the roller drive systems, and various conditions. Is connected via a common serial communication line 80 for wiring reduction, and can mutually transmit and receive data. The graphic terminal 70 is used to input operating conditions such as the yarn speed, the stretching or relaxation ratio between the rollers, the time required for starting and stopping, and the temperature of the heater. In addition, a start / stop switch and the like are provided. The various input conditions are calculated by transmitting data input from the graphic panel 70 to the PC 60, and based on the data, using a previously stored calculation formula. The calculated value is transmitted as a speed command to the inverter INV to each roller drive system, 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 two continuous rollers.

The PC 60 feeds back a signal relating to the speed from the main inverter INV to the PC during the master-slave operation, and calculates a value calculated based on this signal so as to attain a preset stretching or relaxation ratio. To the inverter. When the stretching apparatus is started, the downstream roller is the main and the upstream roller is the slave between the rollers, and when the stretching apparatus is stopped, the upstream roller is the main and the downstream roller is the slave, and the main roller is the downstream. On the other hand, the slave is controlled by the PC so as to follow the acceleration and deceleration while maintaining a constant speed ratio. Here, in the case of the roller in the intermediate portion, one roller is the main roller and the other roller is the slave. 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 stretch or relaxation ratio and the time required for the change are input from the graphic terminal 70, the data and the main speed are changed. The driving condition of the slave roller is calculated based on the speed of the roller by a calculation formula stored in advance, and the calculated value is set to be transmitted from the PC to the drive system of the slave roller.

The temperatures of the heater 5 and the heating rollers 2 and 3 are controlled by a PC 60 by another circuit (not shown).

When the stretching apparatus having such a configuration is started, a master-slave relationship is set between the rollers. Between the supply roller 1 and the first stretching roller 2, the first stretching roller is the main and the supply roller is the slave, and similarly, the first stretching roller 2 and the second
Also between the stretching rollers 3 and between the second stretching roller 3 and the take-up roller 4, the downstream roller is set as the main roller and the upstream roller is set as the slave. When various operating conditions are input from the graphic panel 70 in advance, the data
The operation pattern of each roller is formed as shown in FIGS. 3 and 4 by transmitting to C60 and calculating formulas stored in advance in the PC. 3 and 4 show the relationship between the peripheral speed of each roller and the time at the time of starting and stopping, and FIG.
The drive system of each roller is controlled so as to follow this diagram. During this start-up acceleration and stop deceleration (OT-T3,
In T10-T13), the tentative speed ratio is input so as to be slightly stretched. This is because a proper tension is applied to the yarn to prevent the yarn from breaking.

The operation of this embodiment will be described with reference to the diagrams of FIGS. First, when the start switch of the stretching apparatus is pressed and a start signal is transmitted to the PC 60, a master-slave relationship is set between the rollers, and each roller is accelerated based on the value calculated by the PC while maintaining a constant speed ratio. (OT
1). Then, all the rollers are once operated at a constant speed in the low speed range, and the threading operation is performed (T1-T2). At this time, an appropriate tension is applied to the yarn to keep the drawn state. Since the stretching portion is set between the second stretching roller 3 and the take-up roller 4 which are the relaxing portions, there is no fear of thread 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. After finishing the threading work and inputting the signal of re-acceleration,
Each roller is further accelerated while maintaining the temporary speed ratio again (T2-T3). As described above, since the provisional speed ratio only slightly stretches the yarn, the load due to the stretching of the motor M is small.

When the take-up roller 4 reaches the steady operation speed (T3), the speed is shifted to a predetermined speed ratio in order from the downstream rollers. First, the second stretching roller is accelerated in order to change the speed ratio of the secondary stretching roller 3 to the main take-up roller 4 to a predetermined ratio, and the yarn Y is gradually relaxed. Here, it is set in advance so that it takes a time not to break the thread. As can be seen from FIG. 3, between the second stretching roller 3 and the first stretching roller
The speed ratio between the stretching roller 2 and the supply roller 1 has not been changed yet, and the primary first stretching roller 2 accelerates following the acceleration of the main second stretching roller 3, and The supply roller 1 is accelerated by following the acceleration of the stretching roller 2 (T3-T4). Next, the ratio of the slave first stretching roller 2 to the main second stretching roller 3 is changed (T
4-T5). Finally, the ratio of the secondary supply roller 1 to the main first extension roller 2 is changed (T5 to T6), the speed ratio between all the rollers is the set speed ratio, and the extension device is in a steady operation state. Even if the yarn breaks in this transition step (T3-T6), the time at which the yarn breaks can be grasped from the monitor of the graphic terminal 70, and the changed position of the condition can be easily specified.

The temperatures of the heater 5 and the heating rollers 2 and 3 are heated to a predetermined temperature before the point T6, and substantial production is started from this point. During the steady operation, the PC 60 is controlled by the PC 60 so as to release the above-mentioned master-slave relationship between the rollers and individually maintain the predetermined set speed (T6).
-T7). During normal operation, if the stretching or relaxation ratio between the rollers is input, the master-slave relationship between the rollers is set,
The ratio is controlled between the master and slave to change the speed ratio.

When a full-package signal is transmitted from a winding device (not shown) or a stop switch is pressed and a stop signal is transmitted, the PC 60 stops the machine in order to stop the machine. On the contrary, the upstream roller is set as the main roller, and the downstream roller is set as the subordinate roller. Then, based on the speed of the supply roller, the temporary speed ratio is sequentially shifted from between the rollers on the upstream side.

First, the subordinate first stretching roller 2 is decelerated relative to the main supply roller 1 (T7-T8). Accordingly, the speed of the second stretching roller 3 and the take-off roller 4 is reduced. Next, the speed ratio of the secondary stretching roller to the primary stretching roller is changed, and the speed of the second stretching roller is reduced (T8-T9). The second take-up roller 4 is accelerated with respect to the main second draw-roller 3 between the second draw roller and the take-up roller in a relaxed state to apply an appropriate tension to the yarn and prevent the yarn from breaking. Stretched (T9-T1
0). Each roller is decelerated while maintaining a constant speed ratio, and after being driven at a constant speed for forming a tail yarn, the machine stand is completely stopped (T10-T13). By setting the provisional speed ratio even during deceleration, the load due to the elongation of the motor M can be reduced, and the braking force can be increased, thereby shortening the time required for stopping.

Next, when the machine is restarted while the yarn is being threaded, the downstream roller becomes the main again, the upstream roller becomes the subordinate, and the subordinate roller is accelerated by controlling the ratio of the subordinate 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.

FIG. 5 shows a driving operation pattern at the time of starting each roller in the above-described embodiment in which the second stage is provided with a heater, stretched, subjected to relaxation heat treatment, and then further stretched. At the time of start-up, a temporary stretching ratio is set between all the rollers, and in a transition step from the stretching ratio to a predetermined ratio, as shown in FIG. Part, and finally the first-stage extending part. Here, the reason why the relaxation portion is first changed is to prevent the total stretching ratio during the transition from being higher than the total stretching ratio in the steady state and the yarn from breaking. At the time of stoppage, on the contrary, the second-stage relaxation portion is changed last. Various other methods are used, but the PC 60 can freely set the transition order, so that it can easily cope with the change of the work-in-progress.

As another embodiment, FIG. 6 shows a schematic diagram of connection of a communication line when a four-stage stretching machine is used, and FIG. 7 shows an operation pattern at the time of startup. Even if the stretching magnification increases, the load applied to the motor does not increase so much because the magnification is changed in order.

Further, the present invention is not limited to this embodiment, but may be applied to a textile machine having a drawing and relaxing device such as a draw false twisting machine.

[0026]

As described in detail above, the present invention minimizes the load on the roller driving means due to the stretching and loosening of the yarn at the time of starting and stopping, thereby reducing the equipment cost of the driving means and reducing the cost of the driving means. This has the effect of providing a device that consumes less power. Also, since the time required for starting and stopping can be shortened,
This has the effect that the loss of the yarn can be suppressed as much as possible. Furthermore, since an appropriate tension can be applied to the yarn at the time of starting and stopping, it is possible to reduce the possibility of yarn breakage.

[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 shown in FIG.

FIG. 3 is a graph showing a driving operation pattern at the time of starting each roller in the embodiment shown in FIG. 1;

FIG. 4 is a graph showing a driving operation pattern when each roller is stopped in the embodiment shown in FIG.

FIG. 5 is a graph showing another driving operation pattern at the time of starting each roller in the embodiment shown in FIG. 1;

FIG. 6 is a schematic diagram showing connection of a communication line in another embodiment.

FIG. 7 is a graph showing a driving operation pattern at the time of starting each roller in the embodiment shown in FIG. 6;

[Explanation of symbols]

 INV Inverter M Motor Y Yarn 1 Supply roller 2 First draw roller 3 Second draw roller 4 Take-up roller 10 Supply roller drive system 20 First draw roller drive system 30 Second draw roller drive system 40 Take-up roller drive system 60 Arithmetic processing Equipment (PC) 70 Graphic terminal 80 Serial communication line

Claims (3)

[Claims] 1. A method of operating a multi-stage drawing apparatus in a textile machine in which a plurality of rollers are arranged in the running direction of the yarn, the yarn is multi-stage drawn by a difference in peripheral speed of each roller, and relaxation heat treatment is performed as necessary. Roller driving means for controlling the ratio of the peripheral speed of each roller between each roller is provided, and during start-up acceleration, acceleration is performed while maintaining the provisional speed ratio between each roller, and after the roller at the most downstream reaches the set speed. A method of operating a multi-stage drawing apparatus in a textile machine, wherein the speed ratio between rollers is sequentially shifted to a predetermined speed ratio. 2. The method for operating a multi-stage drawing apparatus in a textile machine according to claim 1, wherein at the time of stop and deceleration, the speed between the rollers is sequentially shifted to a temporary speed ratio based on the speed of the roller at the most upstream side, and then the speed is reduced. 3. The method for operating a multi-stage drawing apparatus in a textile machine according to claim 1, wherein the provisional speed ratio is in a range in which the yarn is drawn.