JPH02198118A - Formation of coil - Google Patents

Abstract

PURPOSE:To make effective pressure to be applied all over to the side by a method wherein, in a coil where an electric wire is rectangularly wound about a bobbin, the coil is made to forcedly pass between a roller pair supported at a prescribed open degree while pressing the opposing sides from both sides. CONSTITUTION:A coil 40 is set on the top side of slide rails 12 of a coil driving means 20, the slide rails 12 are forward driven to push in the coil 40 between respective roles 36a and 36b of the coil pushing means 30a and 30b for being made to pass between the rolls 36a and 36b. The rollers 36a and 36b have the slightly smaller width than the interval between both end plates 41a of a bobbin of the coil 40, while the height is set up to be the same with the height of the sides 40a and 40b of the coil 40. Further, the interval between the rollers 36a and 36b is narrower than the interval between 40a and 40b, and when the coil 40 passes, the interval widens so as to press from both sides with a spring 34 at a prescribed pressure. Thereby, the coil 40 causes neither break of the bobbin nor cutting of an electric wire, while the interval between the sides 40a and 40b is compressed for being formed into a prescribed size.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a coil shaping method for compressing the coil into a shape that is easy to insert into the iron core when the coil is inserted into the iron core.

<Prior Art> Conventionally, an El iron core has been widely used in transformers. E
A transformer using an I iron core has an EI core, as shown in Figure 3.
It has a coil 40 built into an iron core 50. The coil 40 is a rectangular end plate 41a of a bobbin 41 made of resin.
It is formed by winding primary and secondary electric wires 42 around the outer periphery of a rectangular cylindrical core sandwiched therebetween. E
The coil 40 within the L iron core 50 is held between a pair of side yoke portions 51 by the center yoke portion of the El iron core 50 that is inserted through the core portion of the bobbin 41 .

In order to reduce the size of such a transformer, E
l Side yoke portion 51 of iron core 50 and side surface 4 of coil 40
The gaps between the coils 0a and 40b are designed to be extremely small, and in the case of the coil 40 with the electric wire 42 wound around the bobbin 41, it usually does not fit between the side yoke portions 51. Therefore, when incorporating the manufactured coil 40 into the iron core, the two opposing sides 4 are usually
The space between 0a and 40b is compressed from both sides using iron plates or the like to a size that can be inserted into the iron core.

<Problems to be Solved by the Invention> However, the pressed side surfaces 40a and 40b of the coil 40 are the surfaces around which the electric wire 42 is wound, and are affected by variations in the winding method, number of wires, insulators, etc. Boat fishing is not flat. Such an uneven side surface 40a,
When 40b is pressed with an iron plate etc. as described above, the side surface 40
Pressure concentrates on the swollen portions of a and 40b, resulting in serious problems such as cracks in the bobbin 41 of the coil 40 and, in some cases, the wire 42 being cut.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for shaping a coil that is safe and has excellent shaping properties, which solves these problems.

Means for Solving the Problems> The shaping method of the present invention is a shaping method for a coil in which an electric wire is wound in a rectangular shape around a bobbin. is forcibly passed through, and its opposing sides are pressed from both sides.

<Operation> In the shaping method of the present invention, opposing side surfaces of the coil are intensively pressed at their contact portions by a pair of rolls, and the pressing position moves as the coil advances. Therefore, even if the opposite sides of the coil are not flat,
A situation in which the load is concentrated on one part is avoided, and effective pressure is applied to the entire side surface.

<Example> The present invention will be described below with reference to embodiments thereof.

The shaping method of the present invention uses a coil pressing device as shown in FIGS. 1 and 2. The coil pressing device is the substrate 1
A coil driving means 20 is provided horizontally in the center of the coil. The coil driving means 20 includes two left and right guides 11 fixed on the substrate 10 and a slide rail 12 supported by the guide 11 so as to be movable back and forth. It is forcibly driven in the front-back direction by a drive means such as the following. A fixing pin 12a is erected on the rear upper surface of the slide rail 12, and is inserted into the bobbin core of the coil 40 and fixes the coil 40 on the slide rail 12 in the horizontal direction.

The coil pressing means 30a and 30b arranged on both sides of the coil driving means 20 are constructed symmetrically with respect to the coil driving means 20, and each has a support 31 erected on the substrate IO. . A guide plate 32 extending horizontally inward is fixed to the support body 31, and on the upper surface thereof,
A vertical movable plate 33 parallel to the coil drive means 20 is provided movable in a horizontal plane in a direction perpendicular to the coil drive means 20. The movable plate 33 is supported on its outer surface by a plurality of pressing springs 34, and has a roll receiver 35 on its inner surface. The roll supports 35 on both sides rotatably support rolls 36a and 36b, each having a vertical rotation center.

To carry out the shaping method of the present invention using such a coil pressing device, first, the coil 40 is set on the upper surface of the slide rail 12 of the coil driving means 20. The set coil 40 is fixed in the horizontal direction by inserting the fixing pin 12a on the slide rail 12 into the bobbin core, with the opposed side surfaces 40a and 40b, which are the pressed surfaces, facing both sides. .

Immediately after setting the coil 40, the slide rail 12 is driven forward and the coil pressing means 30a,
The coil 40 is pushed between each roll 36a, 36b of 30b and passed between the rolls 36a, 36b. Here, the rolls 36a and 36b on both sides have a width slightly smaller than the distance between both end plates 41a of the bobbin of the coil 40, and the height thereof is set on opposite sides of the coil 40 set on the slide rail 12. The height is set to be the same as that of 40a and 40b. Also, the rolls 36a, 3 on both sides
The interval between the coils 6b is narrower than the interval between the side surfaces 40a and 40b, and is adjusted so that when the coil 40 passes between the rolls 36a and 36b on both sides, the interval widens and the coil 40 is pressed from both sides with a predetermined pressure by the spring 34. ing.

Therefore, the coil 4 is connected between the rolls 36a and 36b on both sides.
When 0 is pushed in, its opposing sides 40a, 4
The front edge of 0b is intensively pressed with a predetermined pressure by rolls 36a and 36b on both sides. As the coil 40 moves forward, the portion of the coil 40 pressed by the rolls 36a and 36b gradually moves rearward. As a result, coil 4
Even if the opposing sides 40a and 40b of the coil 40 have unevenness, by the time the coil 40 has finished passing between the rolls 36 on both sides, the entire sides 40a and 40b are pressed with a predetermined pressure. In this way, the coil 40 is compressed between its side surfaces 40a and 40b and shaped into a predetermined size without causing cracking of the bobbin or cutting of the wire.

When the coil 40 finishes passing between the rolls 36a and 36b on both sides, the slide rail 12 stops, and the shaped coil 40 is taken out from above the slide rail 12. The slide rail 12 immediately retreats to its original position in preparation for shaping the next coil 40.

In the above embodiment, the coil passes between the rolls once, but the coil may pass between the rolls twice or more times by reciprocating the coil, or in multiple stages in the direction of movement of the coil. Similar processing is also possible by arranging pairs of rolls. In addition, in the above embodiment, the roll pair is supported elastically, thereby applying equal pressure to the opposite sides of the coil, but if the dimensions of the manufactured coil are relatively uniform. For example, it is also possible to fix the roll pair in a predetermined position.

<Effects of the Invention> The coil shaping method of the present invention can apply uniform pressure to the entire pressed surface even when the pressed surface around which the electric wire is wound is not flat due to variations in the degree of winding. . Therefore, cracking of the bobbin and cutting of the electric wire are prevented, the yield of coils is increased, safety is improved, and excellent shaping accuracy is also guaranteed.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an apparatus suitable for implementing the coil shaping method of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view of a transformer. 20... Coil driving means, 30a, 30b... Coil pressing means, 36a13
6b... Roll, 40... Coil, 40a, 40b... Opposing side surfaces of coil 40 (pressed surfaces) 41... Bobbin, 42... Electric wire, 50... Iron core.

Claims (1)

[Claims] (1) A method for shaping a coil in which an electric wire is wound into a rectangular shape around a bobbin, in which the coil is forced to pass between a pair of rolls supported at a predetermined opening, and the opposing sides thereof A coil shaping method characterized by pressing from both sides.