JPH01273636A - Method and device for straightening fine wire - Google Patents

Abstract

PURPOSE:To remove the winding set of a fine wire which is of a very small diameter and is soft over the arbitrary length thereof by gripping the fine wire having the winding set over the prescribed length in a manner as not in slacken the wire and imparting prescribed twists to the wire, then applying tensile load on the wire. CONSTITUTION:The fine wire 4 having the winding set is let off from a bobbin 3 and the end part thereof is gripped by a 1st gripping mechanism 1. A motor 35 is then driven to move a moving plate 28 leftward until the fine wire 4 is extended to the prescribed wire length. This wire is gripped by a pressing piece 9 of the 2nd gripping mechanism 2 in a manner as not to slacken the wire 4. A motor 30 is then driven to rotate a rotary plate 21 and to twist the wire 4 by as much as the prescribed number of turns; thereafter, a motor 35 is driven to move the moving plate 28 further leftward so that the prescribed tensile load is applied via a tensile spring 23 to the wire 4. The motor 35 in then run backward to decrease the tensile force down to zero; thereafter, the wire 4 is cut on the inner side of a positioning guide 15 and the inner side of the 2nd gripping mechanism 2. The winding set of the wire 4 which is of the very small diameter and is soft is thereby removed and the wire is straightened over the prescribed length.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for straightening a wire drawn from a winding frame such as a bobbin, and in particular, it relates to a method and an apparatus for straightening a wire drawn from a winding frame such as a bobbin. The present invention relates to a thin wire straightening method and device suitable for removing curls over any length thereof.

[Prior Art] Conventionally, the following devices are known as devices for removing curls from a wire drawn out from a winding frame.

For wires that have a relatively large diameter and hardness, there is a strainer device that straightens the wire by squeezing it with rollers or the like.

In addition, as a device for removing curls within a limited length range of wire rods with small diameters and soft wires, there is
As described in Japanese Patent No. 1-180418, there is a method in which a tensile force near the elastic limit is applied to the wire and then the wire is cut.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the strainer device is configured to sandwich the wire between, for example, two rollers and draw out the wire, or to send out the wire by applying a drive to the rollers. . However, if the wire has an extremely small diameter, a minute difference in the diameter of the two rollers or a minute difference in the perpendicularity between the line connecting the rotation axes of the two rollers and the axis along which the wire is pulled will cause The wire bent in a certain direction, making it extremely difficult to straighten it as desired.

On the other hand, the method described in JP-A No. 61-180418 straightens the thin wire by applying a tensile force near its elastic limit, and then cuts the middle portion in this state. A limited range of fine wire curls can be removed from the tip. However, it has not been possible to straighten a thin wire over an arbitrary length range rather than a limited short range.

By the way, when wiring a soft wire with an extremely small wire diameter, for example, in a very narrow designated route on a circuit board while suppressing the runout, the curls may be removed over a fairly long wire length. It was necessary to have a straight line, and there was a strong demand for this.

However, as described above, in the prior art, it is extremely difficult to straighten a thin wire having an extremely small diameter and softness over an arbitrary length, and the above-mentioned requirements cannot be met.

The present invention solves the problems of the prior art as described above, and provides a thin wire straightening method that can remove curls of extremely thin and soft thin wire over any length thereof, and straighten the thin wire. The object is to provide a method and a device directly used for its implementation.

[Means for Solving the Problems] The structure according to the thin wire straightening method of the present invention for solving the above-mentioned problems removes the curls of the thin wire derived from the winding frame over an arbitrary length range thereof. In the method of straightening the range, one end of a thin wire derived from the winding frame is gripped at a first gripping point, and a point separated by an arbitrary length from this first gripping point is attached to the thin wire. The thin wire is gripped at the second gripping point by applying a tension that does not cause deflection, and the first gripping point is rotated a predetermined number of times around the axis of the thin wire to give twist to the thin wire. After applying a tensile load near the elastic limit to the thin wire between the two gripping points, the tensile load is reduced to O.

More specifically, a thin wire drawn from a bobbin or the like is held to a predetermined length, and a tensile load near the elastic limit of the material is applied in the axial direction of the thin wire over a range of this predetermined length, and in the axial direction of the thin wire. A torsional force in a certain direction centered on
This is achieved by acting in combination.

Further, the configuration of the thin wire straightening device of the present invention is as follows.

In a device that removes curls of a thin wire drawn from a winding frame over an arbitrary length range thereof and straightens the range, a first device capable of gripping one end of the thin wire drawn out from a winding frame is provided. a gripping mechanism, a second gripping mechanism capable of gripping a point separated by an arbitrary length from the gripping point of the first gripping mechanism toward the winding frame, and a gripping mechanism that and a tensioning mechanism capable of applying a tensile load to the thin wire in the length range gripped between the re-gripping mechanisms, and the first gripping mechanism to tighten the thin wire in the length range around its axis. It has a rotation mechanism that can be twisted.

More specifically, there are two independent gripping mechanisms capable of holding a thin wire of a predetermined length, a tensioning mechanism that applies tension in the axial direction of the thin wire via these gripping mechanisms, and one gripping mechanism that can hold a thin wire of a predetermined length. This is achieved by providing a rotation mechanism that can rotate around the axis of the rotation mechanism, and configuring the rotation mechanism so that each can operate independently.

[Operation] One end of the thin wire led out from the reel is gripped by the first gripping mechanism (this gripping point is referred to as the first gripping point).

A thin wire is further drawn out from the winding frame, and a second gripping mechanism grips the wire at an arbitrary length away from the first gripping point (
This gripping point is referred to as the second gripping point).

At this time, tension is applied to the thin wire between the two gripping points to an extent that no deflection occurs. The first gripping mechanism is rotated a predetermined number of times by a rotating mechanism to twist the thin wire between the two gripping points. After this twisting, by moving one of the gripping mechanisms in the axial direction of the thin wire, a tensile load near the elastic limit of the material is applied to the thin wire. After applying this tensile load for a certain period of time, the gripping mechanism is moved in the opposite direction to the direction in which the tensile load was applied, so that the load is around O, and the thin wire is held between the second gripping mechanism and the winding frame. and release both gripping mechanisms. As a result, the curl of the thin wire between the two gripping points is removed, the runout is kept within the allowable range, and the wire can be straightened.

[Example] Hereinafter, the present invention will be explained by examples.

FIG. 1 is a front view showing an embodiment of the thin wire straightening device of the present invention, and FIG. 2 is a plan view of this device.

The outline of this device will be explained with reference to FIG. The second gripping mechanism 2 is capable of gripping an arbitrary length away from the gripping point of the gripping mechanism 1 toward the winding frame, and the first gripping mechanism 1 is used to grip the reel between the two gripping mechanisms. The thin wire 4 in the length range is moved around its axis via a tension spring 23 related to a tension mechanism capable of applying a tensile load to the thin wire 4 in the length range mentioned above, and the first gripping mechanism 1. It has a rotation mechanism R that can be twisted.

This will be explained in detail below.

1 is a first gripping mechanism (details will be described later), 2 is a second gripping mechanism (details will be described later), and 3 is a bobbin around which a thin wire 4 is wound. 11 is a bobbin support stand holding the bobbin 3;
12 is this bobbin support stand 11 and the second gripping mechanism 2
This plate 12 is fixed on the device main body base 13. Therefore, the thin wire 4 drawn out from the bobbin 3 is transferred to the second gripping mechanism 2.
guide ring engaged with5. The second gripping mechanism 2 is reached through the through hole of the tubular positioning guide 6 . The second gripping mechanism 2 includes a gripping base 8, a spring 7, a pressing piece 9 that presses and grips the thin wire 4 against the gripping base 8 by the urging force of the spring 7, and a knob 10 that pulls up the pressing piece 9. It also has a locking mechanism (not shown) that can hold the pressing piece 9 in the pulled up state when the knob 1o is pulled up and turned a certain angle. With this configuration, the thin wire 4 passed through the positioning guide 6 is passed between the pressing piece 9 which is in a pulled up state and the gripping base 8, and is then engaged with the first gripping mechanism 1. It can be guided to the positioning guide 15.

The first gripping mechanism 1 has the same configuration as the second gripping mechanism 2, and includes a gripping base 17, a spring 16, and a biasing force of the spring 16 to press and grip the thin wire 4 against the gripping base 17. It has a pressing piece 18 and a knob 19 for pulling up the pressing piece 18. This first gripping mechanism 1 is
It is fixedly installed on the slide unit 20. The slide unit 20 is integrated with a slider 22, and the slider 22 is placed on the rotating plate 21 so as to be movable in the direction in which both the gripping mechanisms 1 and 2 are connected. Also,
This slide unit 2o is pulled in the direction of the arrow by the urging force of the tension spring 23. 24 is slider 2
2 is a stopper when pulled by the tension spring 23. A shaft 25 is fixed to the rotating plate 21, and this shaft 25 is rotatably supported by a support 26. A gear 27 is fixed to the other end of the shaft 25, and this gear 27 engages with a small diameter gear 31 fixed to the shaft of a motor 3o fixed to the movable plate 28 via a bracket 29. are doing. Therefore, the rotating plate 21 is rotated by the shaft 2 by the motor 30.
It rotates around the 5 axis. That is,
The rotation mechanism R includes a rotation plate 21. Shaft 25. Gear 27. Small diameter gear 31. It consists of a motor 30. The moving plate 28 is configured to move horizontally on a rail 33 attached to the device main body base 13 via a slide guide 32. Further, the drive for horizontally moving the movable plate 28 can be performed by a motor 35 fixed to the apparatus main body base 13 via a bracket 34. That is, the motor 35
When driven, the ball screw 36 rotates and is moved in the horizontal direction via a nut 37 fixed to the moving plate 28.

An embodiment of the thin wire straightening method of the present invention will be described using the thin wire straightening device configured as described above.

One end of the thin wire 4 led out from the bobbin 3 is gripped by the first gripping mechanism 1. At this time, the first gripping mechanism 1 is positioned immediately to the left of the second gripping mechanism 2 by moving the moving plate 28.

Then, by driving the motor 35, the moving plate 28 is moved to the left until the distance between the regripping points of the thin wire 4 reaches a predetermined line length. At this time, make sure that the thin wire 4 does not slacken.
A minute braking force is applied to the bobbin 3 by the brake mechanism 38. When the distance between the first gripping mechanism and the second gripping mechanism 2 reaches a predetermined line length, the motor 35 is stopped, the locking mechanism of the knob 10 of the second gripping mechanism 2 is released, and the thin wire 4 is pressed. Grip with piece 9.

When the motor 3o is turned on here, the rotating plate 21 rotates and the thin wire 4 is twisted. After rotating a certain number of times,
Motor 30 stops. Then, the motor 35 rotates, and the moving plate 28 moves to the left. As a result, the rotating plate 21 also moves to the left, but the first gripping mechanism 1 receives a tensile force via the tension spring 23 (this tensile force is applied to the scale 40 attached to the rotating plate 21 and the slider 22).
). The magnitude of this tensile force is close to the elastic limit of the thin wire 4. Then, the motor 35 rotates in the opposite direction, and the tensile force returns to zero. By cutting the thin wire 4 between the inside of the positioning guide 15 and the inside of the second gripping mechanism 2, the thin wire 4 straightened within this length range can be obtained.

A specific example will be shown.

When a polyimide-coated gold wire with a length of 100 mm and a wire diameter of 50 μm was twisted 3 times/cm and a tensile force of 24 gf was applied, the warpage over the entire length was less than 0.1 mm.

According to the embodiment described above, the winding curl of the thin wire 4 is
is removed between the gripping mechanism 1 and the second gripping mechanism 2, and a straightened thin wire 4 is obtained.

In this way, it is possible to obtain a straight thin wire 4 for any line length, so even if the wiring route on a board circuit has a limited width, for example, You can also wire within that width. Therefore, in the subsequent mounting work, the thin wires that have been wired do not get in the way, and there is no need to perform wasteful work such as cutting through the thin wires, and the efficiency of the wire work is significantly improved.

[Effects of the Invention] As described in detail above, the present invention provides a thin wire that can remove curls in an extremely thin and soft thin wire over any desired length and straighten the thin wire. A linearization method and apparatus directly used for its implementation can be provided.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the thin wire straightening device of the present invention, and FIG. 2 is a plan view of this device. 1... First gripping mechanism, 2... Second gripping mechanism, 3
...Bobbin, 4...Thin wire, 23...Tension spring, R.
...Rotation mechanism.

Claims (1)

[Claims] 1. In a method of removing curls of a thin wire derived from a winding frame over a given length range and straightening the range, one end of the thin wire derived from a winding frame is Grip it at a first gripping point, apply tension to a point that is an arbitrary length away from the first gripping point and grip it at a second gripping point while applying tension to the extent that the thin wire does not bend, and then The first gripping point is rotated around the axis of the thin wire a predetermined number of times to give a twist to the thin wire, and in this state, a tensile load near the elastic limit is applied to the thin wire between the two gripping points. , its tensile load is 0
A thin line straightening method characterized by: 2. In a device that removes curls of a thin wire drawn from a winding frame over an arbitrary length range and straightens the range, a device capable of gripping one end of the thin wire drawn out from a winding frame is used. a second gripping mechanism capable of gripping a point that is an arbitrary length away from the gripping point of the first gripping mechanism toward the winding frame; and the first or second gripping mechanism. a tensioning mechanism capable of applying a tensile load to the thin wire in the length range gripped between both gripping mechanisms; A thin wire straightening device characterized in that it has a rotation mechanism that can be twisted around.