Apparatus for determining the continuity of holes formed in a co

Details Apparatus for determining the continuity of holes formed in a co Apparatus for determining the continuity of holes formed in a co

1982-09-08

1986-07-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

331 65, 340675, G01N 2712, G01R 3312, G08B 2100

Patent

active

046008845

ABSTRACT:
A method for detecting defective press punching, comprising steps of causing an electromagnetic sensor to approach a punched hole of a blank after products are punched by a press, and discriminating the quality of the punched products from the output level of the electromagnetic sensor that changes according to whether or not the circumference of the punched hole constitutes a closed loop electrically, and a device for performing the method.

REFERENCES:
patent: 3742477 (1973-06-01), Enabnit
patent: 3931571 (1976-01-01), Hocking et al.
patent: 4270088 (1981-05-01), Weischedel

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