JP2949253B2 - Transfer mechanism of molded lead wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for transferring a formed lead wire, and more particularly, to a mechanism for transferring a U-shaped lead wire to a rotating drum.

[0002]

2. Description of the Related Art When automatically assembling a bead inductor as shown in FIGS. 1 (a) and 1 (b), first, a U-shaped lead wire is placed at a predetermined interval on a carrier medium such as a perforated paper tape. Hold open and transport intermittently. Then, the medium is fed from the tangential direction to the rotating drum rotating at a constant speed, and the peripheral speed of the rotating drum is synchronized with the feeding speed of the medium, so that the lead wire held by the medium is moved to the rotating drum. The holding teeth formed on the outer periphery can be transferred. The lead wire transferred to the rotating drum is inserted into a bead inductor held by another rotating drum, and is then taped.

[0003]

However, in the case of the above-mentioned transfer mechanism, after the lead wire is formed into a U-shape, the lead wire is conveyed to the rotating drum at regular intervals.
It is necessary to use a medium such as a perforated paper tape, and since this medium does not add any other added value, it causes an increase in cost. In addition, a mechanism for feeding the medium in synchronization with the rotating drum and a mechanism for pulling out the lead wire from the medium on the rotating drum and transferring to the holding teeth of the rotating drum are required, which makes the apparatus extremely complicated. I was

Accordingly, an object of the present invention is to provide a transfer mechanism for a molded lead wire which does not require an auxiliary material such as a paper tape and can easily perform molding of the lead wire and transfer of the lead wire to a rotating drum. Is to do.

[0005]

In order to achieve the above object, a transfer mechanism for a molded lead wire according to the present invention includes a molding die to which a straight lead wire is supplied, and a horizontally movable member inside the molding die. A pusher for forming the lead wire into a U-shape by pushing the center of the straight lead wire horizontally and extruding it from the opening of the molding die; and a pusher that is vertically movable in front of the pusher. Having an inward groove for holding both ends of a U-shaped lead wire pushed out by its elasticity, and a pair of guide surfaces disposed below the holder so as to be rotatable around a horizontal axis and inclined inward. And a rotating drum having holding teeth having a pair of fitting surfaces for holding the outer surfaces of both ends of the lead wire at the bottom of the guide surface, and the distance between the fitting surfaces is an inward groove of the holder. Smaller than the distance between When the holder is lowered, both ends of the lead wire held in the inward groove are bent inward while sliding on the guide surface, and the holder is raised with the lead wire fitted on the fitting surface. Thus, the lead wire is transferred from the holder to the holding teeth.

When a straight lead wire is supplied to the molding die, the pusher advances and forms a U-shape with the molding die. The U-shaped lead wire is pushed out of the opening of the mold by a pusher, and is inserted between the inward grooves of the holder. Since the U-shaped lead wire has a tendency to open outward at both ends due to elasticity (spring back), the lead wire is held in the inward groove of the holder by the elasticity at both ends. The pusher loses contact with the lead wire and retreats as it is. Next, when the holder holding the lead wire descends and approaches the holding teeth of the rotary drum, both ends of the lead wire first contact the guide surface and are bent inward while sliding on the guide surface. When the holder further descends, both ends of the lead wire fit into the fitting surface. Here, since the interval between the fitting surfaces is smaller than the interval between the inward grooves of the holder, the lead wire is disengaged from the inward groove when the lead wire is fitted into the engaging surface, and if the holder is raised in this state, The lead wire is elastically held by the rotating drum.

It is necessary to synchronize the forward and backward movement of the pusher with the vertical movement of the holder so that the holder does not descend with the pusher advanced. In addition, in order to transfer the lead wire held by the holder to the holding teeth of the rotary drum, it is necessary to synchronize the rotation of the rotary drum with the vertical movement of the holder. The rotation of the rotary drum may be either continuous rotation or intermittent rotation. In the case of continuous rotation, the vertical movement speed of the holder needs to be higher than the rotation speed of the rotary drum.

[0008]

2 to 4 show an example of a transfer mechanism according to the present invention. A molding die 1 has a pair of dies 2 projecting from the front end thereof, and an opening 3 is provided between the dies 2. An R surface 2 a is formed on the opening side of the die 2. Straight leads 4 are fed horizontally along the rear surface of the die 2.

On the upper surface of the mold 1, a pusher 6 driven in the front-rear direction by a driving means 5 such as a cylinder is arranged. The distal end of the pusher 6 is formed narrower than the width of the opening 3, and a concave groove 6 a for positioning the lead wire 4 is formed in the width direction on the distal end surface. A pair of cutting guides 7 are arranged on both sides of the mold 1, and these cutting guides 7 can be moved back and forth relative to the mold 1.

In front of the mold 1, especially in front of the opening 3,
A holder 9 driven vertically by a driving means 8 such as a cylinder is provided. On the lower surface of the holder 9, a dovetail-shaped inward groove 10 is provided. The opening width W of the inward groove 10 is slightly larger than the width of the tip of the pusher 6.

Below the holder 9, a rotating drum 11 that rotates continuously in one direction about a horizontal shaft 12 is arranged. The rotating drum 11 has a pair of holding teeth 1
The holding teeth 13 are fixed at predetermined intervals in the front-rear direction with the body portion 15 therebetween. The distance between the holding teeth 13 is larger than the thickness of the holder 9 in the front-rear direction. Therefore, the holder 9
When it drops, it can enter between the holding teeth 13, 13. On both sides of the holding teeth 13, as shown in FIG.
An involute-shaped guide surface 13a and a fitting surface 13b perpendicular to the bottom thereof are formed, and the distance D between the fitting surfaces 13b of the adjacent holding teeth 13 is smaller than the opening width W of the inward groove 10 of the holder 9. . Intermediate teeth 14 smaller than the holding teeth 13 are formed between the holding teeth 13. As shown by a broken line in FIG. 3, a concave groove 13c into which the lead wire 4 is fitted may be provided on the fitting surface 13b.

Next, the operation of the transfer mechanism having the above configuration will be described. First, a method of forming the lead wire 4 into a U-shape will be described with reference to FIG. First, a straight lead wire 4 is fed along the rear surface of the die 2 of the mold 1 as shown in FIG. Next, as shown in FIG. 4B, the cutting guide 7 is slid forward relative to the mold 1, and the front and rear ends of the lead wire 4 are simultaneously cut between the cutting guide 7 and the die 2. , To obtain a lead wire 4 having a certain length. In this case, the mold 1 may be fixed at a fixed position and the cutting guide 7 may be advanced, or the cutting guide 7 may be fixed at a fixed position and the mold 1 may be retracted. Next, the pusher 6 is advanced toward the opening 3, and as shown in FIG. 4C, the central part of the straight lead wire 4 cut into a certain length is pushed forward, and the pusher 6 and the die 2 are connected to each other. Is formed into a U-shape. When the pusher 6 is further advanced, the U-shaped lead wire 4 comes out of the opening 3 forward and is inserted into the inward groove 10 of the holder 9 (see FIG. 4D). At this time, since the lead wire 4 has outward elasticity due to springback,
The lead wire 4 is stably held by the holder 9. Pusher 6
Is retracted, and at this time, the lead wire 4 is
Since only the pusher 6 is retracted while the lead wire 4 is left in the holder 9 because the lead wire 4 is not pressed.

Next, the transfer operation from the holder 9 to the rotary drum 11 will be described with reference to FIG. Rotating drum 1
When 1 reaches the position shown in FIG. 3, the holder 9 starts to descend. At the position A in FIG. 3, both ends of the lead wire 4 held in the inward groove 10 are guided by the guide surfaces 13 a of the holding teeth 13.
, And both ends of the lead wire 4 are bent inward while sliding on the guide surface 13a as the holder 9 descends. Further, when the holder 9 is lowered and the lead wire 4 is fitted to the fitting surface 13b at the position B in FIG. 3, both ends of the lead wire 4 are disengaged from the inward grooves 10, and the lead wire 4 is It is held on the fitting surface 13b by elasticity. At this stage,
When the holder 9 is raised, only the holder 9 is raised, and the lead wire 4 remains on the holding teeth 13 of the rotating drum 11. In this way, the lead wire transfer operation is completed.

In the above embodiment, the drive sources of the pusher, the holder and the rotary drum are provided separately, and these drive sources are synchronized with each other. However, the present invention is not limited to this. And the rotating drum may be driven. In this case, the cam,
It is necessary to separately provide a synchronization mechanism such as a link or a gear. Further, the rotating drum is not limited to the one rotating continuously, but may be the one rotating intermittently at a constant pitch interval.

[0015]

As is apparent from the above description, according to the present invention, after the lead wire is formed by the pusher, the lead wire is transferred to the holder, and is directly transferred to the holding teeth of the rotating drum. There is no need to use a secondary material such as a conventional paper tape, and the cost can be reduced. Further, since it is not necessary to provide a mechanism for pulling out the lead wire from the medium in the rotating drum, the structure of the rotating drum itself can be simplified.
Further, since the transfer of the lead wire utilizes the elasticity of the lead wire itself, a simple holding mechanism is not required and a simple mechanism is required. Therefore, the reliability against failure is high,
Inexpensive configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a bead inductor.

FIG. 2 is an overall perspective view of a transfer mechanism according to the present invention.

FIG. 3 is a front view of a main part of the transfer mechanism according to the present invention.

FIG. 4 is a plan view showing a method for forming a lead wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 4 Lead wire 6 Pusher 7 Cutting guide 9 Holder 10 Inward groove 11 Rotary drum 13 Holding tooth 13a Guide surface 13b Fitting surface

Claims (1)

(57) [Claims] A molding die to which a straight lead wire is supplied; and a molding die which is horizontally movably disposed in the molding die, and horizontally pushes a central portion of the straight lead wire to extrude from an opening of the molding die. A pusher for forming the lead wire into a U-shape, a holder having an inward groove that is disposed in front of the pusher so as to be vertically movable, and that holds both ends of the U-shaped lead wire pushed by the pusher by its elasticity. A pair of guide surfaces disposed below the holder so as to be rotatable about a horizontal axis and inclined inward, and a pair of mating surfaces holding outer surfaces of both ends of the lead wire at the bottom of the guide surface. A rotating drum having holding teeth having the following configuration. The distance between the fitting surfaces is set smaller than the distance between the inward grooves of the holder. When the holder is lowered, both ends of the lead wire held in the inward grooves Part guide surface The lead wire is transferred from the holder to the holding teeth by raising the holder while the lead wire is bent inward while moving and the lead wire is fitted on the fitting surface. mechanism.