JPH06212508A - Method for controlling heater or godet roller - Google Patents

Abstract

PURPOSE:To obtain a method for controlling a heater for godet rollers in which the time to start can be shortened. CONSTITUTION:This method for controlling a heater for godet rollers is to reserve the heat on the surfaces of the godet rollers at a lower temperature than the set temperature (T) by a prescribed value (DELTAT) in stopping the rollers [points (E) to (F)] in a method for heating the surfaces of the installed plural sets of rollers around which spun yarn is wound to the set temperature with the heater, simultaneously varying the peripheral speed and drawing the spun yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater control method for a godet roller having two sets of rollers which are located between a spinning machine and a take-up winder and draw the spun yarn while heating.

[0002]

2. Description of the Related Art First, the structure of a godet roller of this type will be described with reference to FIG. FIG. 3A is a front view of the godet roller, and FIG. 3B is a side view thereof. In the figure, the godet roller has one set of a first heating roller GR1 and a first separator roller SR1, and one set of a second heating roller GR2 and a second separator roller SR2. Several (for example, eight) spun yarns are spun from a spinning machine (not shown), and form a group YG1 in a horizontal row having a width W, and enter the first heating roller GR1. Then, it is wound several times between the first heating roller GR1 and the first separate roller SR1. At this time, the first separate roller SR1 is obliquely arranged so that the group of spun yarns YG1 can move laterally smoothly with respect to the first heating roller GR1. Further, the group of spun yarns YG2 leaving the first heating roller GR1 enters the second heating roller GR2. Then, it is wound several times between the second heating roller GR2 and the diagonally arranged second separate roller SR2. Then, the group of spun yarns YG3 discharged from the second heating roller GR2 is unfolded in the roller axial direction and wound into individual packages by the spin winder TK. This heating roller GR
The spun yarn YG2 between 1 and GR2 is drawn. The peripheral speed ratio of the heating rollers GR1 and GR2 is, for example, GR2 / GR1 = 1.
When it is 5, the film is stretched 1.5 times between the heating rollers GR1 and GR2. That is, the draw ratio = the peripheral speed of GR2 / the peripheral speed of GR1. Nylon filament and polyester filament spun yarn are heating rollers GR1 and G with different peripheral speeds.
The film is stretched by passing through a godet roller having R2 to become FDY (Full Draw Yarn).

As shown in FIG. 3B, a group of spun yarns YG1 comprises a first heating roller GR1 and a first separator SR.
It is wound several times between the first heating roller GR2 and the second heating roller GR2.
And the second separator SR2 are wound several times to transmit the driving force and are heated to reach a spin winder (not shown) while maintaining a predetermined draw ratio. To avoid interference between this group of spun yarns wound several times and the next spun yarn,
A certain distance L1 is required between the group of spun yarns YG1 on the first heating roller GR1. Similarly, the second heating roller GR
A constant distance L2 is also required between the group of spun yarns YG2 on the two. Due to the distances L1 and L2 and the number of windings, the first heating roller GR1 and the second heating roller GR2 have a constant length M.
1 and M2.

The drive system for the heating rollers GR1 and GR2 and the separate rollers SR1 and SR2 will be described with reference to FIG. Each of the heating rollers GR1 and GR2 includes a spindle motor M1-1 and M2-1 and an inverter IV1.
It is possible to shift to a predetermined rotation speed via IV2 and controllers C1 and C2. In addition, the separate roller S
Each of R1 and SR2 is also rotated by the spindle motors M1-2 and M2-2 via the above-mentioned inverters IV1 and IV2 while maintaining a constant ratio to the heating rollers GR1 and GR2 and maintaining the same peripheral speed. That is, 0 to controller C1, C2
When a controlled voltage of 10 V is applied, the inverters IV1 and IV2 perform frequency conversion proportional to the voltage,
Spindle motor M1-1, M2-1, M1-2, M2
-2 is rotation proportional to frequency. The controllers C1 and C2 are controlled by a program incorporated in the microcomputer 7.

Further, the heating rollers GR1 and GR2 shown in FIG. 3 have a built-in heater, and are provided with a contact or non-contact thermometer at an appropriate position on the outer periphery of the rollers. And
Feedback control by the temperature controller controls the roller surface to a predetermined set temperature.

[0006]

By the way, the godet roller described above may be temporarily stopped at the time of thread breakage or the like, during which necessary work such as threading may be performed. During this suspension, the heaters of the heating rollers GR1 and GR2 may be turned off or may be left on. However, when the heater is turned off, there is a problem that it takes time to heat the heating rollers GR1 and GR2 again to the set temperature when restarting. Further, if the heater is kept on, the convective heat radiation on the lower side of the roller is larger than that on the upper side of the roller, so that the upper portion of the roller may become higher than the set temperature. Since the heat capacity of the roller is large in order to reduce the temperature once increased, it takes a longer time than heating the cooled roller to the set temperature, and eventually it takes time to restart.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a heater control method for a godet roller which can shorten the time required for starting. is there.

[0008]

In order to achieve the above object, a heater control method for a godet roller according to the present invention has a plurality of sets of rollers around which spun yarn is wound, and the surfaces of the plurality of sets of rollers are provided. A heater control method for a godet roller that heats a filament to a set temperature with a heater and draws the spun yarn at different peripheral speeds, in which when the roller is stopped, the temperature is kept lower than the set temperature by a predetermined value. Is.

[0009]

When the roller is stopped, if the temperature is kept at a temperature lower by a predetermined value in consideration of the degree of partial temperature rise, there will be no part that exceeds the set temperature.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a graph showing a heater control method for a godet roller of the present invention, and FIG. 2 is a sectional view of a heating roller.

First, the structure of the heating roller GR, which is a main part of the godet roller, will be described with reference to FIG. The heating roller GR has a structure in which the roller body 12 is fitted and fixed to the rotating shaft 11 and the heater 14 is fixed to the housing 13. A plurality of heat pipes 15 extending in the axial direction of the roller are embedded in the outer circumference of the roller body 12 at an equal pitch in the circumferential direction to distribute the heat from the heater 14 around the roller. Further, a ring-shaped space 16 is formed in the roller body 12 inside the heat pipe 15, and the heater 14
The heat generating part 14a is inserted into this space 16 to supply heat to the heat pipe 15. A ring-shaped slit 12b is formed in the flange portion 12a of the roller body 12, and a thermometer 17 is inserted therein.

The heater 14 and the thermometer 17 are connected to a temperature controller 18, and the amount of heat generated by the heater 14 is adjusted by feedback control so that the surface of the heating roller GR reaches a desired set temperature T. The temperature controller 18 is further connected to the controller 19 so that the set temperature T can be changed according to the type and speed of the fiber, and a difference can be made between the heating rollers GR. And
The controller 19 has an operation mode in which an adjustable set temperature T is maintained and a stop mode in which a temperature lower than the set temperature T by a predetermined value ΔT (T−ΔT) is maintained.
When stopped, it automatically switches to the stop mode, and when the restart preparation button is pressed, the heating roller GR rotates and
It is designed to switch to the operation mode. When the entire heating roller GR reaches the set temperature T, the thread can be put into a regular operation state.

Next, referring to the graph of the passage of time in FIG.
A heater control method will be described. Point A is the starting point.
Stop mode (set temperature T-
When heated to a predetermined value ΔT) and reaching point B, the roller rotates, switches to the operation mode (set temperature T), and reaches set temperature T at point C (time t1). Compared to heating at the set temperature T while rotating from the beginning, the time t1 until the temperature rises becomes shorter. However, it is also possible to heat while rotating the roller from point A to point B to point C. Then, the yarn is wound and the spun yarn is drawn. When a yarn breakage or the like occurs on the way and the roller is stopped at the point D (time t1), the mode is switched to the stop mode and the temperature is lowered to the point E and the temperature is maintained. The difference ΔT with the set temperature T is usually 5 to 10 °.
Therefore, it is empirically determined that a part of the roller does not exceed the set temperature T and does not become too large. Further, when the thermometer 17 of FIG. 2 is directly attached to the roller body 12, if the thermometer 17 stops at the lower side, the surface temperature may be measured lower and the roller surface temperature may rise too much. The predetermined value ΔT that predicts the temperature difference in this case is also determined.

When the restart preparation button is pressed at the point F (time t4), the roller rotates and switches to the operation mode (set temperature T), and the entire point is uniformly heated to the set temperature T (point t5). The time (t5-t4) until () becomes the minimum. For example, when the heater is turned off, the temperature drops to room temperature at time t3 as indicated by the chain double-dashed line, and even when the heater is turned on at time t4, the set temperature T is reached at time t6 and the temperature rise time is time t6-t4. And spread significantly.

The arrangement of the godet roller is not limited to that shown in FIG. 3, and a third heating roller and a third separate roller may be additionally provided. Also, a separate roller SR
It is also possible to increase the diameter of either or both of SR1 and SR2 to form a heating roller. Also for these heating rollers, the above-mentioned stop mode (set temperature T-predetermined value Δ
The heater control method by switching between T) and the operation mode (set temperature T) is applied.

[0016]

According to the heater control method of the godet roller of the present invention, when the roller is stopped, the temperature is kept at a temperature lower than the set temperature by a predetermined value, and the temperature is kept at the time of stop so that no part of the temperature exceeds the set temperature. As the difference up to the set temperature becomes appropriate, the temperature rise time at the time of temporary stop or start can be shortened.

[Brief description of drawings]

FIG. 1 is a graph showing a heater control method for a godet roller according to the present invention.

FIG. 2 is a sectional view of a heating roller.

FIG. 3 is a device layout diagram of a godet roller.

FIG. 4 is a drive system diagram of a godet roller.

[Explanation of symbols]

 14 heater 19 controller GR1 first heating roller GR2 second heating roller YG1 to 3 spun yarn T set temperature ΔT predetermined value

Claims (1)

[Claims] 1. A plurality of sets of rollers around which spun yarn is wound are provided, the surfaces of the plurality of sets of rollers are heated to a set temperature by a heater, and the spun yarn is drawn at different peripheral speeds. In the godet roller heater control method, the godet roller heater control method is characterized in that when the roller is stopped, it is kept at a temperature lower than a set temperature by a predetermined value.