JP3161329B2 - Guide pulley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide pulley for feeding an ultrafine wire used in an apparatus for unwinding an ultrafine wire after heat treatment, and more particularly, to an unwinding apparatus for feeding an ultrafine wire coming off the guide pulley. The present invention relates to a guide pulley for preventing another part from contacting and being wound up while being wound or damaged.

[0002]

2. Description of the Related Art After heat treatment of gold wire and other ultrafine wires,
It is wound around a predetermined core material via a rewinding device and shipped. As shown in FIG. 4, in this rewinding device,
A plurality of guide pulleys 2 are arranged on the running line of the extra fine wire 1, and the extra fine wire 1 is fed along a groove 3 provided in each guide pulley 2.

[0003]

However, when rewinding an extra fine wire, the extra fine wire may come off from the groove of the guide pulley due to vibration of the extra fine wire generated during rewinding or an incorrect setting by an operator. There is. In this case, the extra fine wire 1a (indicated by a broken line) that has come off the guide pulley 2 is fed on the support shaft 4 of the guide pulley 2, and the extra fine wire 1 is undesirably wound or damaged.

[0004] The extra fine wire wound or wound as described above must be excluded as a defective product. In most cases, such windings and scratches occur over the entire length of the fine wire, and can be found by visual inspection after the winding of the fine wire. However, in rare cases, winding or scratching may not occur over the entire length of the ultrafine wire, but may occur only partially. In such a case,
Rolls and scratches may be hidden in the ultrafine roll and may not be detected by visual inspection.

[0005] The present invention has been made in view of such a problem, and in the case where an extra fine wire during feeding is detached from the guide pulley and the extra fine wire is wound or damaged, the extra fine wire is used. It is an object of the present invention to provide a guide pulley capable of preventing the reel from being wound as it is.

[0006]

To achieve this object, a guide pulley according to the present invention is a guide pulley comprising two flat circular side surfaces and a circumferential surface connecting these two side surfaces, A groove is provided in the circumferential surface in the circumferential direction, and in the wire feeding guide pulley in which the wire is fed along the groove, a concave portion is formed on at least one of the two circular side surfaces. A tip having a tapered surface located in the recess, a first member made of an elastic material, and a tip facing a tapered surface facing in a direction opposite to the tapered surface of the first member. And a substantially V-shaped groove is formed between the tapered surface of the first member and the tapered surface of the second member.

The first member is dish-shaped or formed to have a plurality of members extending radially from the center. For example, the first member may be formed in a cross shape, a star shape, a polygon shape, or the like, in addition to the dish shape. On the other hand, similarly to the first member, the second member can have a shape such as a dish shape, a cross shape, a star shape, and a polygon shape.

[0008] If the wire being fed through the groove of the guide pulley comes off the groove for some reason, the wire jumps out of the guide pulley. The first member and the second member are arranged on the side surface of the guide pulley so as to form a V-shaped groove. The wire protruding from the guide pulley fits into the V-shaped groove. In particular,
Since the tip of the first member is located in the concave portion formed on the side surface of the guide pulley, the wire that has protruded from the guide pulley is reliably guided along the first member into the V-shaped groove. .

In this way, the wire guided to the bottom of the V-shaped groove receives a greater frictional force than when fed in the groove of the guide pulley, and the wire stops at the bottom of the V-shaped groove. It breaks almost instantaneously due to the large tension acting on the wire. For this reason, it is possible to prevent the wire from being wound while being wound or damaged.

[0010] Generally, a wire winding device is provided with a tension detector for detecting the tension of the wire. When the tension detector detects that the tension has become zero due to the breaking of the wire, the wire winding device is stopped.

[0011]

FIG. 1 schematically shows an apparatus for winding a heat-treated wire. The wire 10 (the material is phosphor bronze, the diameter is 0.3 mm) before the heat treatment is wound around a roll 11. The wire feeding device 12 feeds the wire 10 from the roll 11 to the wire heat treatment mechanism 13.

The wire feeding device 12 includes a wire 10
A tension detector (not shown) for detecting the tension of the wire 10 is provided, and the amount of sending out the wire 10 is determined according to the tension of the wire 10 detected by the tension detector. Further, when the tension detector detects that the tension of the wire 10 is zero (that is, when the wire 10 is disconnected), a disconnection signal is transmitted from the tension detector to the wire feeding device 12, and the wire feeding is performed. The feeding device 12 is a wire 10
Is stopped.

The heat-treated wire 10 passes through a feed pulley 14 to form two guide pulleys 15 according to the present invention.
The paper is fed while being tensioned by the, and is wound up by the roll 16.

FIG. 2 and FIG. 3 show the guide pulley 15. As shown in FIG. 2, the guide pulley 15 includes a guide pulley main body 17 including two flat circular side surfaces 17a and a circumferential surface 17b connecting these two side surfaces. A groove 19 is formed in the circumferential surface 17 b of the guide pulley body 17 in the circumferential direction, and the wire 10 is fed along the groove 19. Guide pulley body 1
An annular concave portion 20 is formed on each of the side surfaces 17a of the seventh.

A leaf spring 21 is disposed as a first member near both side surfaces 17a of the guide pulley body 17. As shown in FIG. 3, the leaf spring 21 includes two tapered portions 21 a and a flat portion 21 b between the tapered portions 21 a, and the tip of each tapered portion 21 a has a recess formed on the side surface 17 a of the guide pulley body 17. 20 located inside. That is, the tip end of each tapered portion 21a enters the inside of the guide pulley main body 17 more than the side surface 17a of the guide pulley main body 17. As will be described later, one of the features of the guide pulley is that the first member is made of an elastic material.

Further, as a second member, a conical disk 2
2 is provided integrally with the leaf spring 21. The disk 22 has a tapered portion 22a facing the opposite direction to the tapered portion 21a of the leaf spring 21. The V-shaped groove 2 is formed between the two tapered portions 21a, 22a.
3 are formed.

The guide pulley body 17 is provided on the support shaft 2.
4, the plate spring 21 and the disk 22 are fixed to the shaft 24, that is, the shaft 2.
4 so as not to rotate.

The guide pulley 15 according to the present embodiment having the above configuration has the following functions. In a normal state, as shown in FIG. 2, the wire 10 is provided with a groove 19 provided on a circumferential surface 17b of the guide pulley body 17.
Have been fed along. If the wire 10 jumps out of the groove 19 for some reason, it falls through a stroke shown by a broken line A in FIG.

In this case, the tapered portion 21a of the leaf spring 21
Is inserted into the recess 20 provided in the side surface 17 a of the guide pulley body 17, so that the wire 10 that has protruded from the groove 19 always has the tapered portion 2 of the leaf spring 21.
This corresponds to 1a. The wire 10 hitting the tapered portion 21a of the leaf spring 21 is moved along the tapered portion 21a as it is.
It slips down the V-shaped groove 23 and reaches the bottom of the V-shaped groove 23.

The V-shaped groove 23 is provided in the guide pulley body 1
7 is formed at an acute angle with respect to the groove 19, so that V
The wire 10 that reaches the bottom of the V-shaped groove 23 is subjected to a greater frictional force and is almost instantaneously frayed at the bottom of the V-shaped groove 23. Alternatively, the wire 10 stops at the bottom of the V-shaped groove 23 due to frictional force, but is cut at a portion S (see FIG. 3) other than the bottom of the V-shaped groove 23 due to the tension acting on the wire 10. .

When the wire 10 is broken, a tension detector provided in the wire feeding device 12 detects the breaking of the wire 10, and the wire feeding device 12 is stopped. Thus, even if the wire 10 jumps out of the groove 19 to the outside, it is immediately guided to the V-shaped groove 23 and cut, so that the wire 10 is not wound or damaged.

In this embodiment, one of the features is that the leaf spring 21 as the first member is formed of an elastic material, for the following reason. A large tension is always applied to the wire 10 to increase the feeding speed. For this reason, if the first member is formed of a rigid material instead of the leaf spring 21, when the wire 10 hits the first member made of the rigid material, the large tension acting on the wire 10 is reduced. Due to this, the wire 10 may be bent or scratched.
On the other hand, if the first member is formed of an elastic material, the first member bends in accordance with the tension even if the wire 10 on which a large tension acts is applied. Can be prevented from being damaged.

In the above-described embodiment, the leaf springs 2 correspond to the two side faces 17a of the guide pulley body 17, respectively.
Although the disk 1 and the disk 22 are arranged, the leaf spring 21 and the disk 22 may be provided so as to correspond to only one of the side surfaces 17a depending on the situation where the guide pulley 15 is used.

In the above-described embodiment, the leaf spring 21 as the first member is formed as a plate-like member, but the shape of the first member is not limited to this. Any shape may be used as long as the wire 10 coming out of the groove 19 of the guide pulley body 17 can be reliably guided to the V-shaped groove 23, for example, a dish shape, a cross shape, a star shape or a polygon shape. Can be formed into various shapes.

[0025]

As described above, according to the guide pulley according to the present invention, even if the wire fed along the groove provided in the guide pulley comes off and jumps out, the wire is pulled out. Is reliably guided into the V-shaped groove formed by the first member and the second member, and is broken at the bottom of the V-shaped groove. For this reason, it is possible to prevent the wound or wound wire from being wound as it is.

[Brief description of the drawings]

FIG. 1 is a schematic view of a wire winding device using a guide pulley according to the present invention.

FIG. 2 is a front view including a partial cross-sectional view of the guide pulley according to the present invention.

FIG. 3 is a perspective view of the guide pulley shown in FIG.

FIG. 4 is a sectional view of a conventional guide pulley.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire 2 Guide pulley 3 Groove 4 Support shaft 10 Wire 12 Wire feeder 13 Heat treatment mechanism 15 Guide pulley 17 Guide pulley main body 17a Side surface of guide pulley main body 17b Circumferential surface of guide pulley main body 19 Groove 20 Depression 21 Leaf spring 22 Disk 23 V-shaped groove 24 Support shaft

Claims (2)

(57) [Claims] 1. A guide pulley comprising two flat circular side surfaces and a circumferential surface connecting these two side surfaces,
A groove is provided in the circumferential surface in the circumferential direction, and in a wire feeding guide pulley along which the wire is fed, a recess is formed in at least one of the two circular side surfaces. A tip having a tapered surface located in the recess;
A first member made of an elastic material; and a second member having a tapered surface whose tip end faces in a direction opposite to the tapered surface of the first member. The tapered surface of the first member and the second member A guide pulley for wire feeding, wherein a substantially V-shaped groove is formed between the tapered surface of the two members. 2. The guide pulley according to claim 1, wherein the first member has a dish shape or a shape having a plurality of members extending radially from a center.