JP3634813B2 - Terminal processing method for automatic winding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic winding machine that includes a nozzle that guides a wire to a winding portion and winds a wire fed from the nozzle around a winding component, and more particularly to the winding terminal processing.
[0002]
[Prior art]
An example of such a conventional automatic winding machine is shown in FIG. The wire holding unit 1 includes a base 2 that can move in a three-dimensional direction, and a plurality of nozzles 3 and a clamper 4 that are fixed to the base 2 at equal intervals. As shown in FIG. 3, the clamper 4 that holds the end 5a of the wire 5 includes a cylindrical tube 4a fixed to the base 2, and a pressing portion having a large diameter at the lower end that is movable up and down in the tube 4a. The shaft 4b has a shaft 4b, a flange 4d fixed to the upper end of the shaft 4b, and a spring 4e attached between the flange 4d and the base 2 and biasing the shaft 4b upward.
[0003]
The end portion 5a of the wire 5 is held between the lower surface of the cylindrical body 4a and the upper surface of the pressing portion 4c. In order to release the wire 5 from the clamper 4, the plate 6 as shown in FIG. 2 is lowered by the air cylinder 7 or the like and the shaft portion 4 b of the clamper 4 is pushed down.
[0004]
FIG. 2 shows a state in which a plurality of winding components 8 built on the lead frame 8b have been supplied to the automatic winding machine. The plurality of winding components 8 and the nozzle 3 are in corresponding positions. The wire 5 fed out from a winding frame (not shown) is drawn from the tip through the through hole of the nozzle 3, and the end 5 a is held between the clampers 4. In order to wind the wire 5 around the terminal 8a of the winding component 8 by this automatic winding machine, first, the wire holding part 1 is moved from the state of FIG. 2, and the nozzle 3 is applied to the terminal 8a to be wound as shown in FIG. Move closer.
[0005]
In this state, the wire holding part 1 is circularly moved on the horizontal plane several times so that the nozzle 3 rotates around the terminal 8a in the direction of the arrow. Then, the wire 5 is wound several times around one terminal 8a as shown in FIG. Thereafter, if the wire holding portion 1 is pulled strongly in the direction away from the winding component 8, the end portion 5a of the wire 5 is cut at the portion that hits the edge of the terminal 8a as shown in FIG. The end portion 5a remains on the clamper 4.
[0006]
[Problems to be solved by the invention]
However, the terminal 8a formed by punching a metal plate has a shape in which the edge on one surface side is rounded. For this reason, the wire 5 may not be cut at the edge of the terminal 8a but may be cut off halfway between the terminal 8a and the clamper 4 as shown in FIG. In particular, when the wire 5 is an extra fine wire, this cutting defect is likely to occur.
An object of this invention is to provide the terminal processing method of the automatic winding machine which can prevent the cutting defect of such a wire terminal.
[0007]
[Means for Solving the Problems]
In the terminal processing method of the present invention, the end portion 5a of the wire 5 is surely cut at the edge portion of the terminal 8a by continuously applying stress to the wire 5.
That is, the present invention includes a wire holding portion having a nozzle for guiding the wire to the winding portion and a clamper for holding the end portion of the wire passing through the through hole of the nozzle, and the tip of the nozzle passes around the terminal of the winding component. In a terminal processing method of an automatic winding machine that winds a wire around a terminal by rotating the wire holding part so as to rotate, the nozzle is connected to the winding part while the end of the wire is held by a clamper. When the wire is wound around the terminal by rotating the wire around the terminal a plurality of times, the terminal processing method is characterized in that the wire holding part is rotated so as to gradually draw a large oval locus every time the tip of the nozzle makes a round.
[0008]
【Example】
FIG. 1 shows an embodiment of the present invention, and 11, 12, 13, and 14 are trajectories drawn by the tip of the nozzle 3 when a wire is wound around the terminal 8a of the winding component 8, respectively. An example in which the nozzle 3 is rotated around the terminal 8a four times is shown. Each time the tip of the nozzle 3 makes a round around the terminal 8a, the wire holding portion 1 is rotated so as to gradually draw larger elliptical trajectories 11, 12, 13, and 14.
[0009]
That is, the tip of the nozzle 3 draws a trajectory 11 passing the path of A, B, C, D, A on the first round from the state shown in FIG. 4, and A, B, C, E, A on the second round. It moves by drawing a trajectory 12 passing through. Further, a trajectory 13 passing through A, B, C, F, A is drawn on the third lap, and a trajectory 14 passing through A, B, C, G, A is drawn on the fourth lap. Each of the elliptical trajectories 11, 12, 13, and 14 has a constant minor axis and is gradually enlarged only in the dimension of the major axis.
[0010]
Expansion of the major axis dimension is performed by fixing the position of one end (B) closer to the terminal 8a and moving only the other end (D, E, F, G) side away from the terminal 8a. . The end 5a of the wire 5 is pulled and tensioned when the clamper 4 moves away from the terminal 8a, and relaxed when approaching. For this reason, the end portion 5a of the wire 5 repeats tension and relaxation every time the nozzle 3 makes a round of the terminal 8a, and is shaken around the portion in contact with the edge of the terminal 8a.
[0011]
Each time the tip of the nozzle 3 makes a round around the terminal 8a, the end 5a of the wire 5 stretched between the terminal 8a and the clamper 4 is pulled by the clamper 4 and gradually expands. Therefore, if the amount of expansion of the elliptical trajectories 11, 12, 13, and 14 is set to be equal to or less than the elongation rate of the end portion 5a of the wire 5, the end portion 5a of the wire 5 gradually extends longer, and the tension to be tensioned is increased. It does not act on the end 5a.
[0012]
Therefore, in the present invention, the amount of change in the major axis of each track 11, 12, 13, 14 of the nozzle 3 is set to a dimension that compensates for the extension of the end 5 a of the wire. As a result of the nozzle 3 drawing and rotating the trajectories 11, 12, 13, and 14 with the long diameter dimension set in this way, the end 5 a of the wire 5 is tensioned every round while the nozzle 3 is rotating. Relaxation will be repeated continuously.
[0013]
Then, the end portion 5a of the wire 5 that has been repeatedly shaken and stretched and weakened is cut at a portion in contact with the edge of the most severely damaged terminal 8a until the final locus 14 is drawn. In setting the amount of change in the major axis for each round of the trajectories 11, 12, 13, 14 of the nozzle 3, not only the elongation rate of the wire 5 but also the fine adjustment according to the material of the coating of the wire 5 is performed. Like that.
[0014]
【The invention's effect】
According to the present invention, since the stress is repeatedly applied to the end of the wire, it is possible to reliably cut the wire at the edge portion of the terminal even if it is a very thin wire. Further, in addition to stabilizing the quality of the connection state between the wire and the terminal, there is an effect that the terminal processing time of the wire can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view showing a locus of a nozzle according to an embodiment of the present invention. FIG. 2 is a perspective view showing a schematic configuration of a conventional automatic winding machine. FIG. FIG. 4 is an enlarged perspective view of the main part of the first winding process. FIG. 5 is a partial perspective view of the second winding process. FIG. 6 is a partial perspective view of the third winding process. Partial perspective view when cutting failure occurs in the third winding process [Explanation of symbols]
1 Wire holding part 2 Plate 3 Nozzle 4 Clamper 5 Wire 8 Winding part 8a Terminal

Claims (3)

A wire holding portion having a nozzle for guiding the wire to the winding portion and a clamper for holding the end portion of the wire passing through the through-hole of the nozzle, the wire so that the tip of the nozzle rotates around the terminal of the winding component In the terminal processing method of the automatic winding machine that winds the wire around the terminal by rotating the holding unit,
With the end of the wire held by the clamper, when the wire is wound around the terminal by rotating the nozzle multiple times around the terminal of the winding component, a gradually larger oval locus is created each time the tip of the nozzle makes a round. A terminal processing method for an automatic winding machine, wherein the wire holding unit is rotated as depicted. The amount of change per round of the oval locus at the tip of the nozzle is set to a dimension that compensates for the extension of the end of the wire, and during the rotation of the nozzle around the terminal, the end of the wire 2. The terminal processing method for an automatic winding machine according to claim 1, wherein tension and relaxation are continuously repeated. The plurality of oval trajectories that the tip of the nozzle draws around the terminal each have a constant minor axis, only the major axis changes, and a position of one end closer to the major axis terminal is fixed. The terminal processing method of the automatic winding machine of Claim 1 or Claim 2.

Images