Patent ID: 9702828
Date: 2017-07-11
CPC Classifications: G01M,G01N

Claim:
1. A pinhole inspection apparatus for can bodies comprising: a rotary plate having a penetrating through hole; a movable plate provided on a stationary frame opposite the rotary plate; a can body holding member that holds a can body; a photodetector that detects light leaking inside the can body; and a light source that irradiates an outer circumferential surface of the can body with light, wherein the movable plate includes a ring plate attached to a front surface of a piston member via a joint member, the piston member having a penetrating hole in a central portion thereof, the ring plate is provided with a shield member formed by an annular member that is formed concentric to the penetrating hole, and the shield member is brought into sliding contact with the rotary plate by a pressure application mechanism.