JPH07172697A - Tension control device for wire rod - Google Patents

Abstract

PURPOSE:To attain optimization of tension control or space reduction by coaxially arranging an operation part to supply a wire rod by applying tension to the wire rod and an adjusting part to adjust the tension according to detected tension of the wire rod and detected rotation of the operation part. CONSTITUTION:A tension control device 1 for a wire rod is arranged between a supply part 2 of the wire rod W and a part 4 to be supplied, and applies tension to the wire rod W by a guide pulley 18 and a pressing pulley 30. In this case, a tension detector 50, a motor 60 and an encoder 62 as a turning angle detector are repectively coaxially arranged on a shaft 14 of the guide pulley 18, and an operation part 70 is composed of these. On the other hand, an adjusting part 142 is connected to the operation part 70. For example, at rupture time of the wire rod W, a tension detecting value of the wire rod W is set in zero, and tension is detected by the tension detector 50, and after this detecting value is compared with a reference value by the adjusting part 142, the motor 60 is controlled according to this difference value. At the same time, an alarm 150 is actuated, and a warning is issued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rod tension control device, and more particularly, when a wire rod is wound around a target member (supply target portion) such as a deflection yoke by a winding device or the like, an appropriate tension is applied to the wire rod. The present invention relates to a tension control device for a wire rod that can be given and supplied.

[0002]

2. Description of the Related Art A conventional wire rod tension control device is used, for example, when a wire rod is wound around a deflection yoke which is mounted on a cathode ray tube and deflects an electron beam. The present applicant has proposed the following wire tension control device.

The wire tension control device comprises a movable pulley for guiding the wire and a tension detector for the wire such as a load cell. The tension applied to the wire rod applies a force to the movable pulley, and the tension of the wire rod is adjusted by detecting the force applied to the movable pulley with a detector.

[0004]

However, such a wire rod tension control device has the following problems. When the wire speed of the wire increases and the wire is exposed or suddenly decelerated, the wire floats or comes off the pulley, and the tension applied to the wire cannot be correctly detected. It is impossible from the measuring principle to wind the wire around the movable pulley in order to prevent the wire from floating or coming off and to detect the correct tension value.

Further, the detecting section for detecting the tension applied to the wire and the operation section for applying the tension to the wire based on the detection value obtained from the detecting section are provided at different places along the flowing direction of the wire. The tension values are different between the detector and the operation unit (control unit) because they are arranged at intervals. Therefore, the correct tension value cannot be controlled, and hunting or the like may occur in some cases. Moreover, it is difficult to make the device compact. Further, for example, in the mechanism in which the load cell is incorporated as the detection unit, it is difficult to provide a high frequency response for tension detection because it has a leaf spring.

Since the conventional tension control device only applies a constant tension to the wire, there is the following problem when the tension value is abnormal. Since the abnormal tension value is not detected, the movement of the operation unit when the abnormal tension value is applied cannot be limited. And it is not possible to notify the outside of the abnormality of the tension value. Therefore, when an abnormal tension value is generated, the movement of the winding machine and the operation unit cannot be restricted, and the winding becomes impossible. Further, in the conventional tension control device, the wire material is fed by controlling it to a specific tension value as described above. However, for example, the wire rod is entangled with the same tension when it is wound around the weak portion of the deflection yoke which is the target component, and the deflection yoke is damaged.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and it is possible to feed a wire material with a correct tension, space saving can be achieved, and the abnormality can be notified when the tension is abnormal. At the same time, it is an object of the present invention to provide a tension control device for a wire rod that can wind a weak portion of a target member such as a deflection yoke without damaging it.

[0008]

According to the present invention, there is provided a tension control device for a wire rod for applying a tension to the wire rod and supplying the wire rod to a supplied portion, wherein a predetermined tension is applied to the wire rod. And a tension detector for detecting the tension applied to the wire, a rotation detector for detecting the rotation of the operation unit, and a tension from the tension detector. A detection signal related to the rotation angle from the rotation detection unit, and an adjustment unit that issues a tension adjustment command signal to the operation unit, and the tension detection unit and the operation unit, This is achieved by a tension control device for coaxially arranged wire rods.

In the present invention, preferably, the operating portion rotates while pressing the wire rod of the first rotary body for supplying the wire rod so as to wind the wire rod. And a second rotating body.

Further, in the present invention, preferably, the adjusting section detects an abnormality in the tension of the wire. In the present invention, preferably, the adjusting section is configured to compare a reference command signal related to a reference tension with the tension adjustment command signal, and the reference command signal related to the reference tension can be changed. .

[0011]

According to the above construction, when the wire rod is tensioned and supplied to the supply target portion, the operating portion applies a predetermined tension to the wire rod and supplies the wire rod supply target portion. The tension detecting unit detects the tension applied to the wire, and the rotation detecting unit detects the rotation of the operation unit.

The adjusting section issues a tension adjustment command signal to the operating section based on the tension detection signal from the tension detecting section and the rotation angle information from the rotation detecting section. The tension detector and the operation unit are arranged coaxially, and the tension can be detected near the operation unit. Moreover, it is possible to reduce the setting space for the tension detection unit and the operation unit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows a preferred embodiment of the wire tension control device of the present invention. The wire tension control device 1 is arranged between the supply unit 2 and the supply target unit 4. The supply unit 2 is, for example, a bobbin around which the wire W is wound. On the other hand, the supplied portion 4 is a winding machine for entwining or winding the wire W around the deflection yoke H as shown in FIG. Wire tension control device 1
Is a device for feeding the wire rod W with a predetermined tension in order to wind the wire rod around the deflection yoke H of FIG. The wire rod tension control device 1 shown in FIG. 1 and FIG. 2 is also called a tensioner, and a wire rod W drawn from a wire rod supply bobbin 2 also referred to as a supply unit is passed through a nozzle 6 shown in FIG. W is guided to the deflection yoke side.

First, the structure of the deflection yoke H shown in FIG. 3 will be described. The deflection yoke H is funnel-shaped or trumpet-shaped and has an opening side 14 and a neck side 16. The deflection yoke H serves as a winding frame that serves as a core of the winding, and is made of, for example, plastic. When the deflection yoke H is set to a cathode ray tube, the opening side 14 is arranged on the fluorescent screen side of the cathode ray tube, and the neck side 16 is arranged on the electron gun side.

The opening side 14 of the deflection yoke H has a section SC1 also called a plurality of pins, a plurality of winding grooves 18, a flange 26, and one opening side circumferential groove 20. The neck side 16 of the deflection yoke H has a section SC2 also called a plurality of pins, a plurality of winding grooves 22, a flange 28 and one neck side circumferential groove 24. The wire W is wound around the opening-side circumferential groove 20, the neck-side circumferential groove 24, the section SC1, the section SC2, and the winding grooves 18 and 22 in a predetermined winding pattern. There is.

The holding operation section 32 holds the deflection yoke H detachably, and is indexable in the direction of rotation about the central axis CH. The nozzle 6 can be moved up and down along a direction parallel to the central axis CH and in the horizontal direction orthogonal to the central axis CH by means not shown. And, for example, the wire tension control device 1 also includes the nozzle 6
It can move in the left-right direction T in synchronization with the left-right direction. As a result, the end of the wire W drawn from the nozzle 6 is pulled out from the end of the deflection yoke H by a pin (section) SC.
Clamp with the guide G of the winding machine to twist to 1,
The wire W guided from the nozzle 6 can be wound around predetermined winding grooves 18, 22 and the like.

Please refer to FIG. 1 and FIG. The wire tension control device 1 includes substrates 10 and 12. A shaft 14 is rotatably supported on the substrate 10 shown in FIG.
Another shaft 32 is attached to the substrate 10. A pulley 18, which is a first rotating body, is attached to the tip of the shaft 14. The area around the pulley 18 is shown in FIG.
As shown in FIG. 3, the wire guide groove 20 is provided.

The pulley 18 is located between the rollers 24 and 26. The roller 24 is a roller on the side of the supply unit 2. Further, the roller 26 is a roller on the supply target section 4 side. The wire W led out from the supply unit 2 is wound one revolution along the groove 20 of the pulley 18 via the roller 24 as shown in FIG. Then, the wire W faces the roller 26 side. The pulley 30, which is the second rotating body, is a pressing pulley having a smaller diameter than the guide pulley 18. The pulley 30 is fixed to the shaft 16. When the pulley 18 is rotated by the motor 40, the pulley 30 fits in the groove 20 of the pulley 18 and rotates together with the wire W sandwiched therebetween.

The pulley 30 is rotatably attached to the tip of the lever 16 as shown in FIGS. The other end of the lever 16 is attached to the substrate 10 by a shaft 32. That is, as shown in FIG.
Is rotatable about the shaft 32 in the direction of arrow R.

One end of the spring 34 is connected to the lever 16, and the other end of the spring 34 is connected to the substrate 1.
It is fixed to pin 0 by a pin 36. As a result, the pin 36 pulls the lever 16 downward, and the pressing pulley 30 presses the wire W against the groove 20 of the pulley 18. Thus, as shown in FIGS. 3 and 1, the wire W from the supply unit 2 passes through the roller 24 and the wire guide 40, is wound once by the guide pulley 18, and is further pressed by the pressing pulley 30. It is configured to be guided to the supply target portion 4 side through one wire rod guide 42 and the roller 26.

As shown in FIG. 4, the direction (reverse direction) from the guide pulley 18 to the supply portion 2 side is the pullback direction BF of the wire W. Further, the direction (forward direction) from the guide pulley 18 to the supplied portion 4 is defined as the drawing direction FF of the wire W.

As shown in FIGS. 1 and 2, the guide pulley 1
8 and the pressing pulley 30 are both bearings (not shown)
It has a built-in so that it can rotate freely in both directions. Moreover, the portions of the guide pulley 18 and the pressing pulley 30 that come into contact with the wire W are covered with a material (for example, rubber) that has a high friction coefficient and does not damage the wire W. As a result, the wire W and the guide pulley 1
8 is prevented from slipping between the pressing pulley 30 and the wire W is not damaged even when tension is applied.

Referring now to FIG. The shaft 14 of the guide pulley 18 has a tension detector 50, a motor 60,
An encoder attached to the motor 60 is connected. The motor 60 has an encoder 62 as a rotation detector that detects the rotation or the rotation angle of the motor 60.

Guide pulley 18 and tension detector 5
0, the motor 60, and the encoder 62 are coaxial (coaxial) as shown in FIGS. 2 and 4. By making them coaxial, the space utilization rate can be increased compared to the conventional arrangement where the tension value detection unit and the operation unit for applying tension to the wire are placed in different locations. Can be made compact. Moreover, since they are coaxial, the tension can be detected at almost the same place, and the detected tension value is unlikely to have an error. The motor 60, the guide pulley 18 and the pressing pulley 30 form an operation unit 70. The operation unit 70 applies an arbitrary tension value to the wire W,
The wire W is supplied to the supply target section 4 side.

As shown in FIG. 4, the adjusting section 142 is connected to the operating section 70. The adjustment unit 142 will be described. The adjusting unit 142 includes an AD converter 80,
Arithmetic unit 84, DA converter 86, and amplifier 8
Have eight. The arithmetic unit 84 includes an AD converter 80.
And the DA converter 86. DA converter 8
6 is connected to the motor 60 via an amplifier 88.

As the tension detector 50, for example, a torque sensor can be used. Examples of the torque sensor include TORKUDUCER (registered trademark) and KUBOTA Torqueducer (registered trademark) KB2 manufactured by Kubota Corporation.
2-002 and the like can be used. The torque sensor 50 is arranged as shown in FIG. 3, and measures the torque of the torsion of the shaft 14 in the rotation direction by the magnetostriction method. Since it has high rigidity, it applies to the shaft 14 with high response. The torque can be detected. Wire rod W here
Is being wound (or rewound) at the linear velocity v by the supplied portion 4 (winding machine), the torque Tm output from the tension detector 50, which is a torque sensor,
The total inertia and the linear velocity v can be expressed by the following equation.

[0028]

[Equation 1]

[0029]

[Equation 2]

[0030]

[Equation 3]

In these expressions, each symbol has the meaning shown in FIG. That is, JP represents the inertia of the guide pulley 18, JT represents the inertia of the rotating portion of the torque sensor (tension detector 50), and J
m indicates the inertia of the rotating portion of the motor 60. Further, D represents a viscous friction coefficient, F represents a tension detection value of the wire W, and r represents a radius of the guide pulley 18. Since the guide pulley 18 is set to the mounting plate 10 of FIG. 2 so that the friction coefficient of rotation becomes extremely small by the bearing as described above, the viscous friction coefficient D can be considered to be zero. Assuming that the viscous friction coefficient D is 0, the torque Tm is given by the following equation.

[0032]

[Equation 4] Therefore, the tension detection value F of the wire W is given by the following equation.

[0033]

[Equation 5] In the expression of the tension detection value F of the wire W, 2 of θ
The second derivative can be obtained by the second derivative of the output value SE of the encoder 62 of the motor 60 shown in FIG. Adjustment unit 14
The output value SE of the encoder 62 is input to the arithmetic unit 84 of 0.
Is given. Further, the torque Tm from the tension detector 50 is analog-digital converted via the AD converter 80 and is given to the arithmetic unit 84 as a signal S1.

The arithmetic unit 84 can obtain the tension detection value F of the wire W based on the equation for obtaining the tension detection value F of the wire. The arithmetic unit 84 compares the obtained tension detection value F of the wire W with the reference command signal S2 from the tension value command unit 100 to obtain a difference. A differential signal S3 corresponding to the difference regarding the tension is output from the arithmetic unit 84 to the DA converter 86.

The differential signal S3 is digital-analog converted by the DA converter 84 and amplified by the amplifier 88 to become the tension adjustment command signal SM. The tension adjustment command signal SM is given to the motor 60 of the operation unit 70. The motor 60 uses this tension adjustment command signal SM
Based on the above, the wire W is moved in the forward direction and the reverse direction to move the wire W in the sending direction (FF) and the pulling direction (BF) in FIG. Thereby, the tension of the wire W is controlled to an appropriate designated value.

Next, the tension value command section 100 for outputting the above-mentioned reference command signal S2 to the arithmetic unit 84 will be described with reference to FIG. The tension value command unit 100 has a tension value command unit 100 interface 96 connected to the controller 110 of the winding machine (supplied part) 4 and a programming console 95.

The tension value command signal SC sent from the controller 110 is input to the interface 96. This tension value command signal SC is applied to the wire W in FIG.
It depends on the time when the deflection yoke H is twisted or wound. For example, when the wire W is wound around the section SC1 of the deflection yoke H, a tension value command signal SC that makes the tension extremely weak is sent to prevent the section SC1 from being damaged or damaged. On the other hand, when the wire W is wound around the circumferential groove 20 of the deflection yoke H, the tension value command signal SC for increasing the tension is transmitted.

On the other hand, the program number SP of the tension value preprogrammed by the programming console 95 is given to the interface 96. That is, the reference command signal S2 given from the interface 96 to the arithmetic unit 84 is given by the tension value command signal SC from the controller 110 or the program number SP of the tension value.
This improves the quality of the deflection yoke H.

As described above, when the wire is entangled or wound around the weak portion of the deflection yoke H, for example, the section SC1, it is possible to apply tension with a slightly weaker tension than when entangled with other portions. ing. In this way, the arithmetic unit 84 compares the tension detection value F of the wire W with the reference command signal S2 that has been changed and designated, and takes the difference to correspond to the weak portion and the strong portion of the deflection yoke H, respectively. Thus, the wire value W can be wound around the deflection yoke H by changing the tension value.

If the wire W wound around the bobbin of the deflection yoke H is broken, the tension detector 50, which is also called an active tensioner detector mechanically connected to the guide pulley 18, is used. A wire breakage of the wire W is detected. That is, by detecting this disconnection, the motor 60 also called a motor for driving the active tensioner can be stopped.

That is, when the wire W is broken, the tension detector 50 detects the tension detection value F of the wire W as zero. Then, the adjusting unit 142 sets the tension detection value F of the wire W detected by the tension detector 50 to A
After conversion by the D converter 80, the arithmetic unit (AL
In U), the difference from the predetermined reference command signal S2 is calculated, and the difference signal S3 is used as the command value. However, the difference between the predetermined tension detection value F and the reference command signal S2 is constant within a certain range. If it continues for more than time, the arithmetic unit 84
Judges that the wire W is broken. Then, the difference value for setting the tension detection value of the wire W to zero is sent to the DA converter 86,
The output analog value is amplified and a tension adjustment command signal SM is given to the motor 60 to limit or stop the operation of the motor 60. As this motor, for example, a highly responsive AC servo motor capable of normal rotation and reverse rotation by the tension adjustment command signal SM can be adopted.

When the wire W is broken in this way,
Preferably, the adjustment unit 142 can activate the alarm 150 to give a warning to the operator by sound or light.

As described above, in the embodiment of the present invention, the wire W can be wound around the guide pulley 18 and the push pulley 30 can prevent the wire W from floating or coming off. Therefore, the correct torque value Tm or the correct tension detection value F can always be detected. Further, since the tension detector 50 and the operation unit 70 are coaxially arranged as shown in FIG. 4, the tension detection value in the operation unit 70 can be used as it is as the tension detection value in the tension detector 50. Tension control can be performed.

When, for example, a torque sensor is preferably used as the tension detector 50, the torque sensor itself has high rigidity and high response, and there are almost no elements that mechanically reduce the response, so the tension detection is performed with high response. The value can be detected. Since the torque sensor inertia JT is much smaller than the motor inertia Jm, there is no particular problem even if the torque sensor is not installed. Further, the adjustment unit 142 can notify the supply target unit 4 and the supply unit 2 that the tension value is abnormal. Then, it is possible to prevent the broken wire W from scattering when the tension is abnormal. This is because the motor 60 can be stopped when an abnormal tension is detected. Further, when the tension is abnormal, the movement of the operation unit 70 can be restricted.

When the detected tension value becomes abnormal,
Since it is possible to stop the supply target portion 4 which is the winding machine, there is no time lag from the operator's abnormal tension until the winding machine is stopped. Therefore, it is possible to increase the number of products produced per day. Further, it is possible to increase the number of products to be produced by shortening the time from stopping the winding due to abnormal tension to starting the winding again. In addition, a method (SP) in which an arbitrary tension value set in advance can be selected by the tension value command unit 100,
Method to directly command an arbitrary tension value (S
Either C) can be selected depending on the specifications of the winding machine.

[0046]

As described above, according to the present invention, it is possible to feed the wire with the correct tension, save space, and notify the abnormality when the tension is abnormal, and the deflection yoke. It is possible to wind even a weak portion of the target member such as the above without causing damage.

[Brief description of drawings]

FIG. 1 is a diagram showing a preferred embodiment of a wire rod tension control device of the present invention, a wire rod supply portion, and a supply target portion around which the wire rod is wound.

FIG. 2 is a side view showing a portion of the wire tension control device of FIG.

FIG. 3 is a perspective view showing the tension controller for the wire rod of FIG. 2, a supply unit, and a supply target unit.

FIG. 4 is a diagram showing each element for obtaining a tension detection value indicating a tension detection unit, an operation unit, a rotation detection unit, an adjustment unit, and the like of a wire rod tension control device.

FIG. 5 is a diagram illustrating each symbol when obtaining a tension detection value.

[Explanation of symbols]

 1 wire tension detector 2 supply part 4 supplied part (winding machine) 18 guide pulley 20 groove 30 push pulley 50 tension detector 60 motor 62 encoder (rotation detection part) 70 operation part 95 programming console 100 tension value command part 142 Adjustment unit

Front page continuation (72) Inventor Hideaki Kawaura 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (4)

[Claims] 1. A wire rod tension control device for applying a tension to a wire rod and supplying the wire rod to a supply target portion, and an operation unit for supplying a predetermined tension to the wire rod and supplying the wire rod to the supply target portion, A tension detection unit for detecting the tension applied to the wire, a rotation detection unit for detecting the rotation of the operation unit, a detection signal regarding the tension from the tension detection unit, and information regarding the rotation angle from the rotation detection unit. A tension adjustment command signal for outputting a tension adjustment command signal to the operation portion, and the tension detection portion and the operation portion are arranged coaxially. Control device. 2. The first operating body, which supplies the wire rod so as to wind the wire rod, and the first operating member.
2. A wire rod tension control device according to claim 1, further comprising a second rotating body that rotates while pressing the wire rod of the rotating body. 3. The tension controller for a wire rod according to claim 1, wherein the adjusting unit detects an abnormality in the tension of the wire rod. 4. The adjustment unit compares a reference command signal related to a reference tension with the tension adjustment command signal, and the reference command signal related to the reference tension is changeable. Claim 2
The tension control device described in.