JP2007331862A - Tension device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To retain tension of a wire material constant without following a speed of the wire material pulled from a winding side. <P>SOLUTION: The tension device 1 has a servo motor 4 for rotating/driving a bobbin shaft 3a inserted with a bobbin 3 wound with a rope 2; a tension measurement machine 6 for measuring tension of the rope 2; and a controller 10 for controlling a current fed to the servo motor 4. In the tension device 1, an actual tension value is measured by the tension measurement machine 6 and is fed-back to torque restriction control, and a tension value applied to the rope 2 is controlled so as to get a target tension value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tension device used when a wire rod fed from a bobbin around which a wire rod is wound is wound with a constant tension.

Some winding devices that take up a thread solder fed from a solder spool around which the thread solder is wound with a constant tension include tension adjusting means (see, for example, Patent Document 1). In this winding device, the bobbin around which the thread solder is wound is rotated by the spindle motor, so that the thread solder is sent out from the solder spool. The yarn solder fed out from the solder spool is wound around a pair of rotatable pulleys attached to both ends of the arm, and the displacement of the arm is detected by an arm position detecting device. When the winding of the thread solder is started and the tension of the thread solder wound around the arm fluctuates, the amount of arm displacement detected by the arm position detecting device is fed back to the tension control device. Thereafter, the take-up control device to which the arm displacement amount is output from the tension control device changes the rotation speed of the feeding motor mounted on the solder spool so that the arm displacement returns. In this way, by changing the thread solder feeding tension, the arm position returns to the normal position, and the thread solder tension is always kept constant.
Japanese Patent Laid-Open No. 9-192733

  However, in this winding device, the tension of the yarn solder is kept constant while controlling the yarn solder so as to follow the speed of the yarn solder pulled from the winding side, so that the tension is pulled from the winding side. A control mechanism that follows the speed of the thread solder is required.

  Therefore, a main object of the present invention is to provide a tension device that can keep the tension of the wire constant without following the speed of the wire pulled from the winding side.

Means for Solving the Problems and Effects of the Invention

  The tension device of the present invention includes a servo motor that rotationally drives a bobbin wound with a wire wound by a winding unit, and a torque that controls a torque applied to the bobbin by changing a current supplied to the servo motor. Control means.

  The tension device of the present invention further includes tension measuring means for measuring the tension of the wire fed from the bobbin, and the torque control means is provided on the servo motor based on the measurement result of the tension measuring means. The supplied current may be changed.

  According to this configuration, the tension applied to the bobbin is controlled by measuring the fluctuation of the tension of the wire with the tension measuring means and feeding back to the torque limit control of the servo motor, so that the tension of the wire is kept constant. Therefore, a control mechanism for following the speed of the wire pulled by the winding means is not necessary.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a tension device according to an embodiment of the present invention.

  The tension device 1 shown in FIG. 1 includes a servo motor 4 that rotationally drives a bobbin shaft 3 a on which a bobbin 3 around which a rope 2 is wound is inserted, a plurality of guide rollers 5, and a tension that measures the tension of the rope 2. A measuring machine (load cell) 6 and a controller 10 for controlling the current supplied to the servo motor 4 are provided.

  The controller 10 performs tension control of the rope 2 using torque control of the servo motor 4 directly connected to the bobbin shaft 3a. That is, the controller 10 controls the pulling force when the rope 2 is pulled. Therefore, even if the rope 2 is pulled at any speed, it is a torque limit control for controlling only the torque, and it is not necessary to perform a control regarding the speed. In addition, a controller that processes various signals at high speed is used for torque limit control.

  When the rope 2 is wound up, the state of the rope 2 wound around the bobbin 3 changes, and a change in the tension value due to the change in the winding diameter of the rope 2 appears. In the tension device 1, the actual tension value is measured by the tension measuring device 6 and fed back to the torque limit control, so that the tension value applied to the rope 2 is controlled to be the target tension value.

  The servo motor 4 is set with a speed limit value that is a servo internal limit value. In torque control of the servo motor 4, a torque control signal and a speed control signal are input, and a speed limit value is determined by the speed control signal. It is not necessary to control the speed without changing the speed limit value, just by setting the speed limit value, and even if it is rotated at a speed exceeding the speed limit value due to external influence, there is no effect. Rope 2 is pulled out. Therefore, no matter what speed the rope 2 is pulled out, the tension value of the rope 2 can be kept constant on the servo 1 axis without considering the speed of the rope 2 (without speed control).

It is a schematic diagram of a tension device concerning an embodiment of the invention.

Explanation of symbols

1 Tension device 2 Rope 3 Bobbin 4 Servo motor 5 Guide roller 6 Tension measuring machine (load cell)
10 Controller

Claims (2)

A servo motor that rotationally drives a bobbin wound with a wire wound by a winding means;
A tension device comprising: torque control means for controlling torque applied to the bobbin by changing a current supplied to the servo motor. It further comprises tension measuring means for measuring the tension of the wire fed from the bobbin,
The tension device according to claim 1, wherein the torque control unit changes a current supplied to the servomotor based on a measurement result of the tension measurement unit.

Images