JPH09329514A - Wire tension detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a wire tension detecting device to accurately detect the tension of a wire by maintaining a linear proportional relationship between the energizing force of a spring and the distortion of a distortion gauge even when the tension of the wire varies largely. SOLUTION: A rotary encoder 16 is attached to an arm 1. When the arm 1 is turned with its one end 1a as a center by the change of the tension of a wire 7, its turning direction and angle are detected by the rotary encoder 16, and the electric signals indication them are sent to a controller 15. The controller 15 controls the turning speed of a motor 8 and eventually the tension of the wire 7 according to these electric signals. Thereby, the arm 1 is maintained approximately in a vertical direction, and therefore, it is avoided that a spring 6 comes of from a vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire tension detecting device for accurately detecting the tension of a wire in order to keep the traveling speed of the wire constant during the heat treatment of an ultrafine wire such as an IC wire.

[0002]

2. Description of the Related Art When heat-treating ultrafine wires such as IC wires, it is required that the running speed of the wires be constant. This is because if the traveling speed of the wire is not constant, the heat treatment time is different for each part of the wire, and it becomes impossible to perform uniform heat treatment of the wire.

The traveling speed of the wire is proportional to the tension of the wire. Therefore, in order to keep the traveling speed of the wire constant, the tension of the wire may be detected and the tension of the wire may be adjusted so that the tension of the wire always has a constant value. Therefore, conventionally, various devices for detecting the tension of the wire have been proposed. FIG. 3 shows an example of such an apparatus.

The conventional wire tension detecting device shown in FIG. 3 has an arm 1 rotatably supported with one end 1a as a fulcrum, a pulley 2 rotatably attached to the other end 1b of the arm 1, and an arm. A rod 3 extending from one end 1a of the rod 1 in a direction perpendicular to the arm 1, a hook member 4 attached to one end of the rod 3 so as to form a right angle with the arm 1 in a plane in which the arm 1 rotates, and a strain gauge 5. , And a spring 6 attached between the hook member 4 and the strain gauge 5 so that the angle between the strain gauge 5 and the strain gauge 5 is approximately 90 degrees.

The wire 7 is unwound from a roll 9 by a motor 8 and passes through a heat treatment mechanism 10. In this heat treatment mechanism 10, the wire 7 is subjected to necessary heat treatment such as annealing. The wire 7 after heat treatment has a fixed pulley 11, a movable pulley 2 and a fixed pulley 12
And is taken up by the take-up roll 13.

In the wire tension detecting device shown in FIG. 3, the tension of the wire 7 is detected as follows. For example, when the rotation speed of the motor 8 changes due to the fluctuation of the voltage that drives the motor 8, the traveling speed of the wire 7 changes, and the tension of the wire 7 also changes.

When the tension of the wire 7 becomes larger than before, the arm 1 rotates in the direction of arrow A, and accordingly, the hook member 4 rotates around the rod 3 as shown by arrow A1.
Rotate in the direction of. Since the spring 6 is further extended by the rotation of the hook member 4 in the direction of the arrow A1, the biasing force of the spring 6 increases according to the amount of rotation of the hook member 4.

On the other hand, when the tension of the wire 7 becomes smaller than before, the arm 1 pivots in the direction of the arrow B, and contrary to the above case, the hook member 4 causes the spring 6 to move. The elastic force rotates the rod 3 in the direction of arrow B1. That is, the spring 6 contracts and the biasing force of the spring 6 decreases.

The increase and decrease of the urging force of the spring 6 in these two cases are detected by the strain gauge 5 connected to the spring 6, and the detection result is converted into the tension of the wire 7 and then the strain gauge 5 is detected. It is displayed on the connected display unit 14.

The operator adjusts the rotation speed of the motor 8 through the controller 15 for controlling the motor 8 in accordance with the value displayed on the display 14 so that the tension of the wire 7 becomes constant. Can be maintained.

[0011]

As described above, the conventional wire tension detecting device converts the change in the tension of the wire 7 into the change in the urging force of the spring 6, and changes the urging force of the spring 6 in the strain gauge 5. The tension of the wire 7 is adjusted accordingly.

When the change in the tension of the wire 7 is converted into the change in the urging force of the spring 6, if the change in the tension of the wire 7 is small, the spring 6 expands and contracts substantially on the vertical line, so that an almost accurate conversion can be performed. It is possible. On the other hand, when the change in the tension of the wire 7 is extremely large,
Rotation of the hook member 4 in the A1 direction increases, and as a result, as shown in FIG. 4, the expansion and contraction direction of the spring 6 forms an angle θ with the vertical direction.

If the expansion and contraction direction of the spring 6 deviates from the vertical direction in this way, the value obtained by multiplying the original urging force of the spring 6 by cos θ is transmitted to the strain gauge 5, and the tension of the wire 7 is increased. Cannot be detected accurately.

The present invention has been made in view of the above problems in the conventional apparatus, and the wire tension detection that enables the wire tension to be accurately detected even when the change in the wire tension is large. The purpose is to provide a device.

[0015]

In order to achieve this object, a wire tension detecting device according to the present invention comprises an arm rotatably supported with one end as a fulcrum and a rotatably attached to the other end of the arm. And a pulley that is in contact with a running wire, a hook member attached to one end of the arm so as to form a constant angle with the arm in a plane in which the arm rotates, a strain gauge, and the strain. In a wire tension detecting device including a spring mounted between the hook member and the strain gauge so that the angle between the arm and the gauge is approximately 90 degrees, the arm detects a rotation angle of the arm. Arm rotation angle detection means is attached, and the arm rotation angle detection means outputs a signal corresponding to the direction and angle of rotation of the arm to the wiper. Sent to the motor to feed the chromatography, characterized by being adapted to control the rotational speed of said motor in response to the signal.

In this wire tension detecting device, the rotation direction and angle of the arm are detected by a rotary encoder or other arm rotation angle detecting means. The detected rotation direction and angle of the arm are converted into an appropriate electric signal and sent to the motor for feeding the wire. The rotation speed of the motor is controlled according to the electric signal. In this way, the rotational speed of the motor can be adjusted in response to changes in the tension of the wire, and thus the arm can always be oriented almost vertically. As a result,
Since the spring always faces almost vertically, it is possible to accurately detect the tension.

[0017]

FIG. 1 shows an embodiment of a wire tension detecting device according to the present invention. This wire tension detecting device is rotatably attached to an arm 1 rotatably supported with one end 1a as a fulcrum and the other end 1b of the arm 1 as in the conventional wire tension detecting device shown in FIG. A pulley 2, a rod 3 extending from one end 1a of the arm 1 in a direction perpendicular to the arm 1, and a hook member 4 attached to one end of the rod 3 so as to form a right angle with the arm 1 in a plane in which the arm 1 rotates. And a strain gauge 5 and a spring 6 attached between the hook member 4 and the strain gauge 5 so that the angle between the strain gauge 5 and the strain gauge 5 is approximately 90 degrees.

In this wire tension detecting device, a rotary encoder 16 is attached to the rod 3 as an arm rotating angle detecting means, and the rotary encoder 16 determines the rotating direction and the rotating angle of the arm 1. It can be detected. The rotation direction and angle of the arm 1 detected by the rotary encoder 16 are converted into an electric signal and sent to the controller 15 that controls the motor 8 that drives the roll 9 around which the wire 7 before the heat treatment is wound.

Further, in the wire tension detecting device according to the present embodiment, the strain gauge moving mechanism 1 capable of moving the strain gauge 5 freely in the expansion and contraction direction of the spring 6.
7 are provided. The strain gauge moving mechanism 17 is a plate having a rod 17a that is rotatably supported around an axis and has a male thread on the outer circumference, and a screw hole (no reference numeral) having a female thread on the inner circumference. It consists of 17b. The plate 17b is integrally joined to the strain gauge 5. The rod 17a is engaged with the screw hole of the plate 17b, and the plate 17b and thus the strain gauge 5 are moved up and down by a desired distance according to the rotation direction and the rotation angle of the rod 17a.

The wire 7 is unwound from the roll 9 by the motor 8 and passes through the heat treatment mechanism 10. In this heat treatment mechanism 10, the wire 7 is subjected to necessary heat treatment such as annealing. The wire 7 after heat treatment has a fixed pulley 11, a movable pulley 2 and a fixed pulley 12
And is taken up by the take-up roll 13.

The wire tension detecting device according to the present embodiment having the above-mentioned structure operates as follows. First,
The zero point adjustment of the wire tension detecting device is performed as follows. As shown in FIG. 2, a weight W having a predetermined weight is suspended at the tip of the wire 7 to apply a constant tension to the wire 7. Next, the strain gauge moving mechanism 17 adjusts the urging force of the spring 6 so that the arm 1 is substantially vertical while the weight W is suspended. After that, the position of the arm 1 is stored in the rotary encoder 16,
The rotary encoder 16 uses the position of the arm 1 as a reference position to detect the rotation direction and the rotation angle of the arm 1. Furthermore, the indicator 14 is adjusted so that the value of the strain gauge 5 at this time shows a predetermined value (for example, zero).

After the zero point adjustment of the wire tension detecting device is completed, the motor 8 is rotated to start feeding the wire 7 from the roll 9 and heat-treat the wire 7. When the tension of the wire 7 increases during this time, the arm 1 rotates in the direction of arrow A. The rotary encoder 16 detects the rotation direction and the rotation angle of the arm 1 from the reference position, and sends an electric signal representing them to the controller 15. The controller 15 increases the rotation speed of the motor according to the electric signal. This makes the wire 7
Tension decreases. As a result, the arm 1 always faces the vertical direction.

On the other hand, when the tension of the wire 7 decreases, the arm 1 rotates in the direction of arrow B. Also in this case, the rotary encoder 16 detects the rotation direction and the rotation angle of the arm 1 from the reference position, and sends an electric signal indicating them to the controller 15. The controller 15 reduces the rotation speed of the motor according to the electric signal. as a result,
The arm 1 always faces the vertical direction.

As described above, in any case, the arm 1 always faces the substantially vertical direction, and as a result, the spring 6 expands and contracts substantially in the vertical direction. Therefore, the accurate value of the tension of the wire 7 is displayed on the indicator 14 via the strain gauge 5, and the tension of the wire 7 can be accurately maintained at a constant value via the controller 15. become.

[0025]

According to the wire tension detecting device of the present invention, since the arm is always maintained in the vertical direction, the error in measuring the wire tension caused by the large rotation of the arm is eliminated. be able to.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a wire tension detecting device according to the present invention.

FIG. 2 is a schematic diagram of a wire tension detection device at the time of initial adjustment.

FIG. 3 is a schematic view of a conventional wire tension detecting device.

FIG. 4 is a partially enlarged view showing a problem of the conventional wire tension detecting device.

[Explanation of symbols]

 1 Arm 2 Pulley 3 Rod 4 Hook member 5 Strain gauge 6 Spring 7 Wire 8 Motor 9 Roll 10 Heat treatment mechanism 11 Fixed pulley 12 Fixed pulley 13 Winding roll 14 Indicator 15 Controller 16 Rotary encoder 17 Strain gauge moving mechanism

Claims (2)

[Claims] 1. An arm rotatably supported with one end as a fulcrum, a pulley rotatably attached to the other end of the arm and in contact with a running wire, and a surface on which the arm rotates. A hook member attached to one end of the arm so as to form a constant angle with the arm, a strain gauge, and the strain gauge so that an angle between the strain gauge and the strain gauge is approximately 90 degrees. A wire tension detecting device comprising a spring mounted between the arm and an arm rotating angle detecting means for detecting a rotating direction and an angle of the arm. The means sends a signal according to the direction and angle of rotation of the arm to the motor that pays out the wire, and the motor is turned according to the signal. A wire tension detecting device characterized in that the rolling speed is controlled. 2. The wire tension detecting device according to claim 1, further comprising strain gauge moving means for moving the strain gauge in a direction of expansion and contraction of the spring.