JPH0652691B2 - Winding machine tension device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tension device provided for applying a predetermined tension to a wire in an automatic winding machine, and particularly to an automatic winding machine for small electronic components. The present invention relates to a structure of a tension device suitable for.

[Prior Art] An automatic winding machine is used to wind a wire around an electronic component such as a coil or a delay line. The automatic winding machine performs a winding process by rotating a bobbin of a coil while holding a wire fed from a winding frame by a guide nozzle or the like, or by rotating a guide nozzle around a terminal. At this time, in order to accurately wind the wire around the bobbin or the terminal, it is necessary to apply a predetermined tension to the wire.

There are two types of tension applied to the wire, the back tension that always gives pull resistance to the drawn wire,
It is usually used in combination with a second tension for slackening as needed.

FIG. 5 shows an example of the configuration of a conventional tension device that applies such tension to the wire. One end of an arm 3 is fixed to a holder 2 which is rotatably instructed to a shaft 1, and a roller 3a is attached to the other end of the arm 3. A spring 4 is attached to a hook 2a fixed to the holder 2 via an adjuster 2b, and the holder 4 is provided with a rotational force for lifting the tip of the arm 3 by the spring 4.

The wire 5 unwound from the winding frame or the like passes between two pressing plates 6a and 6b made of soft felt or the like, and is supplied to a winding portion such as a guide nozzle (not shown) through the pulley 7 and the roller 3a.

When pulling the tip of the wire 5 in the state shown in FIG.
A pulling resistance due to the friction of the pressing plates 6a and 6b pressed by the spring 8, that is, a back tension and a second tension corresponding to the rotational force of the arm 3 are applied to.

[Problems to be Solved by the Invention]

This conventional tension device has a drawback in that dust is likely to be accumulated between the pressing plates 6a and 6b, so that it is difficult to stably maintain the initial performance for a long period of time and that it must be cleaned frequently.

Further, the back tension due to the friction of the pressing plates 6a and 6b and the tension due to the rotating force of the arm 3 are independent from each other, and both tensions always act on the wire. For this reason, when the wire is momentarily strongly pulled, a large tension acts on the wire, and when the wire becomes an extremely fine wire, there is a problem that the wire breaks frequently and cannot be used.

[Object of the Invention]

A first object of the present invention is to provide a tension device suitable for an ultrafine wire that can stably generate a minute tension of 10 grams or less.

It is a second object of the present invention to provide a tension device that reduces the back tension when the wire is strongly pulled and prevents excessive tension from being applied to the wire.

[Means for Solving the Problems]

The present invention is intended to generate a stable and minute back tension by suppressing the rotation of the pulley around which the wire is wound by the brake element biased by the spring.

In addition, a first spring that applies a rotational force to the arm and a second spring that generates back tension are connected via a shaft, and the respective springs apply rotational forces in opposite directions to the shaft, Both have a mutual relationship such that the back tension decreases as the tension by the arm increases.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the tension device of the present invention, and FIG. 2 is a plan view of a part thereof. The parts corresponding to those of the conventional example described above are denoted by the same reference numerals in these drawings.

A shaft 20 which is vertically mounted on a base 10 of an automatic winding machine and is rotatable has two levers 22 and 24 which are solid so as to project to opposite sides from each other. The lever 22 is connected to one end of a spring 4 for applying a rotational force to the arm 3, and the other lever 24 is an adjuster attached to the base 10.
A spring 30 having one end fixed to 32 is connected. By these two springs 4 and 30, rotational forces in opposite directions are applied to the shaft 20.

A shaft 1 supporting a tension arm 3 is horizontally attached to the base 10 in the same manner as in the conventional case, and a second shaft is provided in parallel with the shaft 1.
The shaft 40 of is fixed. As shown in FIG. 2, a circular collar 42 is integrally formed on the shaft 40, and a pulley 50 having a groove 52 on the outer periphery is rotatably mounted at a position close to the collar 42. A ball bearing (not shown) is attached to the bearing portion of the pulley 50 so that the pulley 50 can be lightly rotated. A thin sheet 60 made of Teflon resin or the like having a small surface friction resistance is interposed between the pulley 50 and the collar 42 so that the pulley 50 can be lightly rotated even when the pulley 50 is pressed against the collar 42 side.

A U-shaped holder 74 having two ball bearings 72 rotatably attached to its tip is fixed to the shaft 20.

The two springs 4 and 30 are adjusted so that the positions of the adjuster 2b and the adjuster 32 are moved so that the spring 30 exerts a larger rotational force on the shaft 20 than the spring 4. As a result, the holder 74 swings toward the pulley 50, and the ball bearing 72 abuts against the side surface of the pulley 50 so that the pulley
By pinching 50 between the collar 42 and the ball bearing 72 via the seat 60, a minute rotational resistance is given to the pulley 50. Ie holder 74 and ball bearing
72 is a brake element that gives rotation resistance to the rotating pulley 50.
Make up 70. The wire 5 supplied from a winding frame (not shown) is wound around the pulley 50 once and then sent out to the winding portion side through the holding portion 3a at the tip of the tension arm 3.

Next, the operation of this tension device will be described.

Pulley sandwiched between ball bearing 72 and seat 60
Since the back tension due to the rotational resistance of 50 is extremely small, the back tension occupies most of the tension applied to the wire 5 when the wire 5 is pulled out by a constant light force. On the other hand, when the delivery destination of the wire 5 is strongly pulled, the tip of the tension arm 3 is largely pulled down, and the wire 5 is tensioned by the arm 3. However, at this time, since the holder 2 rotates together with the arm 3 and the spring 4 is strongly pulled, a rotational force in the opposite direction against the spring 30 is applied to the shaft 20. For this reason, the holder 70 rotates together with the shaft 20 and the ball bearing 72 moves in a direction away from the pulley 50, and the rotational resistance applied to the pulley 50 is reduced.

That is, the tensioning device of the present invention is usually a pulley.
A minute back tension due to the rotational resistance of 50 is the wire 5
When the wire 5 is strongly pulled, the tension by the flexible arm 3 that easily follows a large movement is given, and at the same time, the back tension by the pulley 50 that is hard to follow a sudden movement is reduced. .

It is not always necessary to attach a ball bearing 72 to the brake element 70. As shown in FIG. 3, the brake element 70 'having the rounded tip of the holder 74 is brought into contact with the side surface of the pulley 50 having a good slip. You may do it.

In addition, the brake is a spring 4 for the tension arm 3.
A spring that applies a rotational force to the shaft 20 in the opposite direction to
It may be anything as long as it is biased by 30 to suppress the rotation of the pulley 50. Therefore, a belt-shaped brake element 80 as shown in FIG. 4 can also be used. This brake 80 is a pulley
It is hooked on a small diameter portion 54 formed integrally with 50 ', and one end thereof is fixed to the end portion of a lever 24' fixed to the shaft 20. The spring 30 connected to the other end of the lever 24 'exerts a force in the arrow direction on the brake element 80, so that the friction between the small diameter portion 55 and the brake element 80 imparts rotational resistance to the pulley 50'.

〔The invention's effect〕

Conventionally, the back tension of at least about 30 grams was the limit, but according to the configuration of the present invention, a minute back tension of 6 to 8 grams can be stably generated. Moreover, the tension by the tension arm and the back tension are correlated with each other, and the back tension is reduced or released when the wire is strongly pulled, so that the operation is extremely stable and hard to break even if an extremely fine wire is used. There is an effect that a tension device can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a tension device of the present invention, FIG. 2 is a partial plan view thereof, FIG. 3 is a partial plan view of a tension device in which a brake shoe is modified, and FIG. FIG. 5 is a partial perspective view of a tension device using another brake element, and FIG. 5 is a perspective view of a conventional tension device. 1 ... 1st axis, 40 ... 2nd axis 3 ... Arm, 42 ... Tsuba 3a ... Holding part, 50 ... Pulley 4 ... Spring, 60 ... Seat 5 ... Wire, 70 ... … Brake element 10 …… Base, 72 …… Ball bearing 20 …… Shaft, 74 …… Holder 30 …… Spring, 80 …… Brake element

Claims (3)

[Claims] 1. A shaft rotatably attached to a base, to which rotational forces in opposite directions are applied by a first spring and a second spring, a brake attached to the shaft, and a shaft intersecting with the shaft. The first spring is provided with an arm rotatable about the first shaft and having a holding portion through which a wire is passed at the tip, and a pulley rotatably mounted on the second shaft fixed to the base. One end of the arm is connected to the arm so that the holding part moves upward, and the second spring urges the shaft to move the brake so that the brake suppresses the rotation of the pulley, and the groove of the pulley and the arm. A tension device for a winding machine, characterized in that it is configured to apply a tension to a wire that has passed through a holding portion at the tip. 2. A brake element is constituted by a holder fixed to a shaft and a ball bearing attached to the holder, and a flange is fixedly provided on the second shaft at a position close to the pulley, and the pulley is used as the flange. The tension device for a winding machine according to claim 1, wherein the tension device is sandwiched between the ball bearing and the ball bearing. 3. A tension device for a winding machine according to claim 2, wherein a thin plate having a small surface friction coefficient is interposed between the flange and the pulley.