JP2000331818A - Coil bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil bobbin structure which is easily and inexpensively fabricated and provided with an induction groove suitable for windings of different diameters. SOLUTION: A coil bobbin is composed of a bobbin main body 1 and a corner part 8. The bobbin main body 1 is possessed of a winding drum 2 whose corner is provided with a cutout 4. The corner part 8 is fixed to the cutout 4. An induction groove 7 suitable for the diameter of an induction winding is provided to the corner 8. Therefore, a large and expensive forming die is not required for each winding of different diameter, a coil bobbin of this structure is capable of coping with a winding of different diameter properly replacing a corner part, so that, an inexpensive coil bobbin can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for guiding a winding to a predetermined position of a winding bobbin of a coil bobbin.

[0002]

2. Description of the Related Art In order to guide a winding to a predetermined position on a winding bobbin of a coil bobbin, it is known to form a guiding groove at a corner of the winding bobbin so as to fit the winding diameter. In general, a required convex portion is formed in advance at a location corresponding to the corner in the coil bobbin molding die, and a guide groove of a required size is obtained.

[0003]

When a coil bobbin is wound on a coil bobbin with a thinner or thicker winding than a normal winding for obtaining a different type of coil device, the size of the guide groove is incompatible. Become. If a thin or thick winding is forcibly wound as it is, the aligned winding is disturbed. It is difficult to change only the location of the convex portion of the molding die, and the corresponding guide groove is dedicated to a normal winding, and a winding of a different diameter cannot be applied thereto. The purpose of the present invention is
An object of the present invention is to provide a structure of a coil bobbin that can easily and inexpensively provide an induction groove suitable for windings having different diameters.

[0004]

SUMMARY OF THE INVENTION The present invention provides a bobbin body 1.
And a corner portion 8. The bobbin main body 1 has a cutout 4 at a corner of the winding drum 2. The corner portion 8 is fixed to the missing portion 4. A guide groove 7 is formed in the corner portion 8 so as to guide the winding to fit the winding diameter. If a guide groove suitable for windings of different diameters is to be obtained, the corners must be replaced with appropriate ones. The bobbin body is not changed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given with reference to FIGS. The illustrated coil bobbin according to the present invention includes a bobbin main body 1 and a corner portion 8. The bobbin main body 1 has a cutout 4 at a corner of the winding drum 2. The corner portion 8 is fixed to the missing portion 4. A guide groove 7 is formed in the corner portion 8 to fit the diameter of the winding 10 for winding induction. The corner portion 8 is replaced as needed to obtain a guide groove 7 of an appropriate size. Although it is necessary to appropriately change the corner portion 8, it is not necessary to replace the bobbin main body which occupies most of the coil bobbin. The bobbin body 1 and the corner portion 8 are made of synthetic resin molded using respective molding dies, and they are appropriately combined to obtain a coil bobbin. The bobbin body 1 includes a winding drum 2 and flanges 3 at both ends thereof.
including. The winding drum 2 has a rectangular shape with corners, and has a cavity 9 for inserting an iron core (not shown) therein. The total number of corners 8 is four. The guide groove 7 of the corner portion 8 is formed by a pair of mountain halves 5 and a valley diameter portion 6 therebetween.
A mounting projection b is formed on the corner portion 8, and the mounting projection b
Into the corresponding receiving hole of the defective portion 4 to fix the entire corner portion 8. The guide groove 7 in the corner portion 8 causes the first layer of the winding 10 to be aligned and wound. If the first layer is aligned winding, the second and subsequent layers are also aligned winding.

[0006]

According to the present invention, the bobbin main body and the corner portion are separately formed, and the corner portion is fixed to a defective portion of the bobbin main body. For this reason, it is not necessary to prepare a large and expensive molding die for each winding diameter, and it is possible to cope with the above by appropriately changing the corners, thereby obtaining an inexpensive coil bobbin.

[Brief description of the drawings]

FIG. 1 is a front view of a bobbin main body according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of a completed product in which a corner portion 8 is fixed to the bobbin main body of FIG.

FIG. 4 is a partially enlarged side sectional view taken along line aa of FIG. 3;

FIG. 5 is a cross-sectional view of a main part occupying a state in which winding is applied to a finished product of the coil bobbin.

[Explanation of symbols]

1: coil bobbin, 2: winding drum, 3: brim, 4: missing part,
5: crest, 6: trough, 7: guide groove, 8: corner, 9: cavity, 10: winding

Claims (1)

[Claims] 1. A bobbin main body 1 and a corner portion 8. The bobbin main body 1 has a cutout 4 at a corner of a winding drum 2, and the corner 8 is fixed to the cutout 4. A guide groove 7 for winding induction suitable for the winding diameter
A coil bobbin characterized by forming: