JP2797735B2 - Coil bobbin molding failure detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a defective coil bobbin used as a coil component or a transformer.

[0002]

2. Description of the Related Art As coil parts and transformer products have become smaller, their coil bobbins have also become smaller and their shapes have become more complicated. When the coil bobbin is manufactured by resin molding, as the coil bobbin becomes smaller and more complicated, it becomes difficult for resin to flow into the details of a molding die, and the yield rate of the formed coil bobbin is reduced. In particular, when processes such as assembly processing after molding are performed by automatic equipment, when the coil bobbin is defective, not only the subsequent process is wasted, but also due to poor molding, the operation rate of the equipment in the subsequent process is reduced. It is necessary to detect a molding defect in order to exert an influence.

[0003]

However, there is no effective method for judging the quality of a complex molded part. At present, the quality of a complex molded part is judged visually by an operator. It was poor in sex.

An object of the present invention is to provide a highly reliable coil bobbin molding defect detecting apparatus which eliminates the above-mentioned conventional disadvantages.

[0005]

In order to solve this problem, a coil bobbin molding defect detecting device according to the present invention is provided with a thin portion at the open end of a cylindrical bobbin having a bottom.
A gas outlet configured to be in close contact with the open end of the coil bobbin so as not to allow gas to escape, an adjusting valve for keeping the amount of gas sent to the outlet constant, and between the adjusting valve and the outlet. And a pressure detector provided in the device.

[0006]

If the coil bobbin formed by the above construction is not formed properly, a gap is formed between the outlet and the coil bobbin, so that gas leaks and the pressure does not increase or it takes time to increase. This is used to determine pass / fail.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of one embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a coil bobbin to be inspected, which is formed in a cylindrical shape with a bottom and has a plurality of flanges 1a on the outer periphery, and 2 denotes a case where resin is insufficient at the upper end of the coil bobbin 1 during injection molding. It is a thin portion provided so as to cause molding failure. Reference numeral 3 denotes a gas outlet configured to be in close contact with the coil bobbin 1 so as not to escape gas, and reference numeral 4 denotes a spring for pressing the gas outlet 3 against the coil bobbin 1. 5 is a regulating valve for regulating the flow rate of gas,
It is connected to a high pressure gas supply source 7. Reference numeral 6 denotes a pressure detector provided between the outlet 3 and the regulating valve 5.

The operation of the coil bobbin molding failure detecting device having the above-described configuration will be described below.

At first, the gas outlet 3 is separated from the formed coil bobbin 1. Now, while blowing out a certain amount of gas, the blowing port 3 is pressed against the thin portion 2 of the coil bobbin 1. When the coil bobbin 1 is in perfect shape, the gas is sealed and the pressure between the regulating valve 5 and the outlet 3 increases. Further, when the coil bobbin 1 is defectively formed, a notch is formed in the thin portion 2, gas leaks out from the notch, and the pressure between the regulating valve 5 and the outlet 3 does not increase. . Or it takes time to ascend.

In this embodiment, after a predetermined time has elapsed after the outlet 3 is pressed against the coil bobbin 1, the outlet 3
The quality of the molding of the coil bobbin 1 is determined by detecting the pressure between the control valve 5 and the pressure detector 6 with the pressure detector 6.

[0012]

As described above, according to the present invention, a thin portion is provided, and if the resin is insufficient during injection molding, the coil bobbin is formed so that the thin portion becomes defective in molding. On the other hand, a gas outlet configured to be in close contact with the coil bobbin so as not to escape gas, and an adjustment valve for maintaining a constant amount of gas sent to the outlet,
By providing the pressure detector provided between the regulating valve and the outlet, it is possible to reliably and easily determine whether or not the shape of the coil bobbin is perfect.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a coil bobbin molding failure detecting apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil bobbin 2 Thin part 3 Outlet 5 Adjusting valve 6 Pressure detector

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Makoto Ito 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) H01F 5/02, 27 / 00,41 / 00,41 / 12

Claims (1)

(57) [Claims] 1. A gas outlet configured to provide a thin portion at an open end of a bottomed cylindrical coil bobbin so as to be in close contact with the open end of the coil bobbin so as to prevent gas from escaping. An apparatus for detecting a molding failure of a coil bobbin, comprising: an adjusting valve for maintaining a constant amount of gas to be sent; and a pressure detector provided between the adjusting valve and the outlet.