| 摘要 |
PURPOSE:To enable continuous inspection of pin holes in unpainted and unprinted cans by means of a groove for preventing leaked light provided on a light lealing ring disc made of a wear resistant material in a rotary type continuously optical inspector for empty cans. CONSTITUTION:An opening of an unpainted and unprinted an alpha received by a seat 32a f a star wheel with a slide pusher is retained with a light sealing ring disc 36 made of a wear resistant material larger in the hardness than that of the can alpha having a groove 80 so as to prevent possible leakage of light rotating with the star wheel. Under such a condition, a light is irradiated on the can alpha from a source provided at a light inspecting station. When any pinhole is in the can alpha, the light coming into the can scatters and is inspected accurately with a light detector 46 free from noise by the leakage of light. Thereafter, rejected cans are adsorbed under vacuum and discharged with a pressure air jetted at the discharging station. This ensures a maintenance-free use of a light sealing ring disc forming a light seal thereby allowing a continuous inspection of pinholes for a long term. |
