JPH04295909A - Tension generation controller - Google Patents

Abstract

PURPOSE:To improve the tension controllability of the tension generation controller which uses a servomotor. CONSTITUTION:The tension 7 of a material 1 to be tensed is converted by a tension detection part 2 into a tension signal 8. A tension control part 3 compares the tension signal 8 with a tension specification input 13 and outputs an output torque command 9 to a servo driver 4. The servo driver 4 outputs a current output 10 which is proportional to the output torque command 9 to the servomotor 5, which outputs a torque output 11 proportional to a current output 10 to a tension generation part 6. The tension generation part 6 outputs the torque output 11 as a tension output 12 to the material 1 to be tensed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension generation control device for generating tension in a tensioned material using a servo motor and for controlling the tension.

0002

[Prior Art] Conventionally, a tension generation control device that uses a servo motor to generate tension in a tensioned material and controls the tension outputs a rotation speed command from a tension control section to a rotation speed control input of a servo driver. and controls the rotation speed of the servo motor.

0003

[Problems to be Solved by the Invention] However, in the conventional tension generation control device described above, the output torque of the servo motor is maximized within the rotational speed control range of the servo motor, so disturbances such as speed fluctuations occur. In such cases, there are drawbacks such as oscillations in which maximum tension and no tension are repeated due to response delays in the control system, and maximum tension temporarily occurring even without oscillation. Incidentally, when the maximum tension occurs, the tensioned material often stretches or breaks, making it unusable.

[0004] Accordingly, the present invention provides a tension generation control device using a servo motor, which is controlled so that the maximum tension is not generated due to a delay in response of the control system, even when there is a disturbance or the like.

[0005]

In the present invention, the torque generated by the servo driver is controlled by sending an output torque command from the tension control section to the servo driver instead of a rotational speed command.

[0006]

[Operation] By outputting the command from the control unit as an output torque command to the servo driver as described above, even if a disturbance occurs in the control system, the generated tension will increase or decrease at a value proportional to the response of the control system. This eliminates the occurrence of oscillations in which maximum tension and no tension are repeated, or temporary maximum tension, which occurs when controlling the rotational speed. This improves tension controllability.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of a tension generation control device according to the present invention.

The tensioned material 1 is a wire or a strip. The tension 7 generated thereby is detected in the form of current or voltage by a tension detection section 2 consisting of a differential coil or a strain gauge, and becomes a tension signal 8. The tension signal 8 is input to the tension control unit 3, and to this tension control unit 3, there is also a tension specification input 13 which can be externally determined to an arbitrary value, in the form of voltage or current magnitude, numerical information, etc. is input. The tension control unit 3 compares and calculates the tension signal 8 and the tension designation input 13, and outputs an output torque command 9 such that the actual tension 7 becomes the same as the tension designation input 13 by adjusting the voltage or current magnitude, or It outputs numerical information etc. to the servo driver 4. The servo driver 4 outputs a current output 10 having a value proportional to the output torque command 9 to the servo motor 5. The servo motor 5 outputs a torque output 11 that is proportional to the current output 10. The torque output 11 is transmitted as a tension output 12 to the tensioned material 1 by the tension generating section 6, and tension is generated in the tensioned material 1. The tension is controlled by the above.

As shown here, the torque output 11 of the servo motor 5 is proportional to the output torque command 9. Therefore, as with conventional rotation speed control, maximum tension (maximum torque)
This prevents sudden occurrence of the problem and improves controllability.

The servo driver 4 also has a rotation speed control input that has been used conventionally, but if this is left open, the servo motor 5 may malfunction due to noise, etc. Enter the command.

Next, an example of the tension generating section 6 is shown in FIGS. 2 and 3.

FIG. 2 shows an example of a case where direct control is performed using an uncoiler 201 around which the tension material 1 is wound. The tensioned material 1 is wound up from the uncoiler 201 by a winding machine 203 . The tension is determined by the uncoiler 201 and the servo motor 5.
is connected through a speed reducer 202 and controlled by adjusting the rotational torque of the uncoiler 201. A tension detection unit 2 is installed between the uncoiler 201 and the winder 203.

FIG. 3 shows an example of a case where the tension of the material 1 to be tensioned is controlled during the feeding device 303. As shown in FIG. Tensioned material 1
is sent by the sending device 303. Tension is generated by sandwiching the tensioned material 1 between a tension generation roller 301 and a tension generation pinch roller 302, connecting a servo motor 5 to the tension generation roller 301 through a speed changer 202, and controlling the rotational torque of the tension generation roller 301. Controlled by adjustment. A tension detection section 2 is installed between the tension generation roller 301 and the feeding device 303.

In the example of FIG. 2, it is also possible to use a feed device 303 as shown in FIG. 3 instead of the winder 203.

[0015]

[Effects of the Invention] As described above, by using the present invention, the controllability of tension is improved. This also eliminates elongation and breakage of the tensioned material caused by tension fluctuations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a tension generation control device of the present invention.

FIG. 2 is a diagram showing an example of a tension generating section that controls tension in an uncoiler.

FIG. 3 is a diagram showing an example of a tension generator that controls tension in the middle of the feeding device.

[Explanation of symbols]

1 Material subjected to tension 2 Tension detection section 3 Tension control section 4 Servo driver 5 Servo motor 6 Tension generation part 8 Tension signal 9 Output torque command 10 Current output 11 Torque output 12 Tension output 13 Tension specification input 201 Uncoiler 202 Speed reducer 203 Winder 301 Roller for tension generation 302 Pinch roller for tension generation 303 Feeding device

Claims (1)

[Claims] Claim 1: A tension detection unit that extracts the tension of the tensioned material as a tension signal, and a tension detection unit that compares and calculates the tension signal and a tension designation input input from the outside, and calculates the tension of the tensioned material to be the same as the tension designation input. a tension control unit that outputs an output torque command such that the output torque command is input to an output torque control input, a servo driver that outputs a current output proportional to the output torque command, and a servo driver that outputs a current output proportional to the output torque command; A tension generation control device comprising: a servo motor that outputs a torque output; and a tension generation section that uses the torque output as a tension output to generate tension in the tensioned material.