JPS6351614A - Tension controlling device - Google Patents

Abstract

PURPOSE:To prevent the unexpected breaking of a wire material by a method wherein the overload on the wire material is avoided by releasing the torque added to a supporting arm when recoiling force in excess of the preset value is added to a supporting arm by the wire material. CONSTITUTION:A wire material 2 is inserted into the core hole of a troidal core 13, the tip of the wire material 2 is gripped by a chuck 14, and a suitable length of the wire material is pulled out. Then, an excitation current is made to flow on a powder clutch 7, the torque of a driving motor 9 is transmitted to a supporting arm 3, the supporting arm 3 is pivotally moved in the winding direction of the wire material 2 from the standby position, a tension roller 1 is contacted to the wire material 2, and tension is given to the wire material 2. At this time, when the recoiling force applied to the tension roller 1 from the wire material 2 exceeds the preset transfer torque, the powder clutch 7 is turned OFF. Then, when the pivotal movement of the supporting arm 3 is stopped by bringing the tension roller 1 into contact with the wire material 2, the excitation current on the power clutch 7 is cut, and the driving motor 9 is brought into the state of inverse rovolution. When the wire material 2 is pulled out to the opposite side of its standby position by rotating the chuck 14 in the direction of the arrow C as shown in the diagram with a work 12 as the center point, the powder clutch 7 is connected, and the supporting arm 3 is pivotally moved and returns to its standby position. Then, the above-mentioned procedures are repeated, and the winding operation of the wire material 2 is finished.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a winding machine that inserts a wire into a hole or gap in a toroidal core and winds the wire around the toroidal core while applying tension to the wire. This tension control device is used, for example, in the winding of a magnetic head of a video tape recorder.

(Prior art) Conventional tension control devices for winding machines include one that applies frictional force to the wire, one that applies frictional force to the drum by winding the wire around a drum and applying a brake to it, and hysteresis brake. There are methods that apply .

However, all of these devices are for supplying wire rods, and it has been difficult to use them as tension control devices during winding of toroidal cores.

Therefore, recently we have installed a tension arm directly on the motor.
A device has been proposed that uses the swinging motion of the tension arm to bring the tension roller into contact with the wire rod, absorbs the slack in the wire rod, and curls the winding direction of the toroidal core (for example, Japanese Patent Laid-Open No. 59-201406 Public bulletin).

(Problem to be solved by the invention) However, in the above-mentioned tension control device, the tension force is adjusted by electrically controlling the torque of the motor, so when an excessive load is applied, There was a problem that disconnection occurred.

(Means for Solving the Problems) The tensile run control device of the present invention is a tension control device that applies tension to the wire in order to absorb the slack in the wire that occurs when winding a toroidal core. a tension roller that abuts and directly applies tension; a support arm that supports the tension roller; a drive means that swings the support arm to bring the tension roller into contact with and release from the wire; A torque release means is provided for releasing the torque applied to the support arm when a reaction force equal to or greater than a set value is applied to the support arm due to contact with the wire rod.

(Function) When a reaction force of more than a set value is applied from the wire to the support arm, the torque applied to the support arm is canceled by the torque release means, and as a result, the wire is not overloaded and wire breakage occurs. do not have.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of the tension control device of the present invention. However, the overall structure of the winding machine is different from those proposed in the past (for example, Japanese Patent Laid-Open No. 59-201
406) can be applied, and illustration of the entire winding machine is omitted here.

In the figure, reference numeral 1 denotes a tension roller that comes into contact with the wire 2 and applies tension directly to the wire 2.

This tension roller 1 is provided at the tip of a support arm 3. The rear end of the support arm 3 is fixed perpendicularly to a rotating shaft 4, and a potentiometer 5 is provided on one end of the rotating shaft 4, and a torque limiter 7 is provided on the other end via a compulsion ring 6. . Further, a gear 8 is attached to a rotating shaft protruding from the other end of the torque limiter 7 , and this gear 8 is meshed with a gear 10 attached to the rotating shaft of a drive motor 9 . That is, the driving force of the drive motor 9 is
It is transmitted to the rotating shaft 4 via the gear l018, the torque limiter 7, and the coupling 6, and the support arm 3 is swung by the rotation of the rotating shaft 4.

In addition, in the figure, 11 is a stopper that stops the swinging of the support arm 3, 12 is a workpiece to which a toroidal core 13 is fixed, 1
Reference numeral 4 denotes a chuck for gripping the wire rod 2, and these chucks are supported and fixed or movably provided at appropriate positions of a winding machine (not shown).

The workpiece 12 may have a shape used as a single azimuth head with one toroidal core 13 fixed thereto as shown in FIG. 2, or it may have two toroidal cores 13. There is a shape that is used as a fixed double azimuth head.

The support arm 3 swings (rotates) in an arc around the axis of the rotating shaft 4, and when it rotates to a certain angle across the straight line connecting the toroidal core 13 and the chuck 14, it touches the stopper 11. The rotation is stopped upon contact.

In addition, in this example, a powder clutch whose transmission torque is proportional to the excitation current is used as the torque limiter 7, and the transmission torque that assumes an appropriate tension is set by the excitation current, so that it can be used when an excessive load is suddenly applied. The powder clutch 7 is disengaged.

Next, the operation of the tension control device having the above configuration will be explained.

Now, since the winding of the toroidal core 13 transports the wire 2 in the direction, the tension roller 1 is stationary at a standby position (the position indicated by the two-dot chain line in FIG. 1). At this time,
Although the drive motor 9 is being driven, the powder clutch 7 is not energized and is in a slipping state, and the torque of the drive motor 9 is not transmitted to the support arm 3.

Next, insert the wire 2 into the core hole of the toroidal core 13,
The tip of the wire rod 2 is gripped by the chuck 14 and moved in the direction of arrow C in FIG. 1 to pull out the wire rod 2 to an appropriate length. The tensile state of the wire rod 2 at this time is not a state in which it is pulled to the tension required for winding, but a state in which it is stretched with some margin, and the wire rod 2 is in a state in which it is in contact with the toroidal core 13. However, they are not in close contact.

Next, an exciting current is applied to the powder clutch 7 to transmit the torque of the drive motor 9 to the support arm 3, and the support arm 3 is moved from the standby position to the direction in which the wire 20 is wound (in the direction of arrow B in FIG. 1). The tension roller 1 is rotated, and the tension roller 1 is brought into contact with the wire rod 2 to apply tension to the wire rod 2. At this time, if the reaction force from the wire 2 to the tension roller 1 exceeds the transmission torque of the powder clutch 7 set by the exciting current, the powder clutch 7 is disengaged and acts as a torque limiter. Therefore, if the load exceeds the set value, the wire 2
Since the wire rod 2 does not get caught, breakage of the wire rod 2, etc. is prevented.

Next, when the rotation of the support arm 3 is stopped by the tension roller 1 coming into contact with the wire rod 2, the excitation current of the powder clutch 7 is completely cut off, and the drive motor 9 is left in a state of reverse rotation. Stopping the rotation of the support arm 3 can be detected by stopping the rotation of the shaft of the potentiometer 5.

Next, the chuck 14 turns around the workpiece 12 in the direction of arrow C in FIG. 1, so that the wire rod 2 is wound around the toroidal core 13. Then, when the wire rod 2 is pulled out to the side opposite to the support arm 3 with the toroidal core 13 in between, the powder clutch 7 is connected and the support arm 3 is rotated back to the initial standby position.

Thereafter, the above operation is repeated as many times as necessary to complete the winding work of the wire 2 around the toroidal core 13.

In addition, in the above embodiment, a powder clutch is used as the torque limiter 7, but a hysteresis clutch which can obtain the same effect as a powder clutch may also be used.

(Effects of the Invention) As explained above, according to the tension control device of the present invention, since the torque release means prevents a load exceeding a set value from being applied to the wire, it is possible to prevent unexpected breakage of the wire. In addition, winding can also reduce the occurrence of defects.

[Brief explanation of the drawing]

1 is an overall configuration diagram of the tension control device of the present invention, FIG. 2(a) is an overall perspective view of a single azimuth head, FIG. 2(b) is an enlarged view of a toroidal core portion,
Figure (a) is an overall perspective view of the double azimuth head;
b) is an enlarged view of the toroidal core portion. 1... Tension roller 2... Wire 3... Support arm 4... Rotating shaft 5... Potentiometer 6... Coupling 7... Torque limiter (powder clutch) 8.10... gear
9... Drive motor 11... Stopper 12
...Work 13...Troidal core 14...
Chuck No. 271J 1? Figure 13

Claims (1)

[Scope of Claims] 1) A tension control device that applies tension to a wire rod in order to absorb slack in the wire rod that occurs when winding a toroidal core, the device comprising: a tension roller that comes into contact with the wire rod and applies tension directly; a support arm that supports the tension roller; a drive means that swings the support arm to bring the tension roller into contact with and release from the wire rod; A tension control device comprising: a torque release means for releasing torque applied to the support arm when a reaction force exceeding a value is applied.