| 摘要 |
PURPOSE:To check a detector for a mark provided on an endless belt from blocking the loading of a cassette into and the unloading thereof out of a support member by enabling the retreat of the detector from the span position of the endless belt when the cassette is removed from the support member. CONSTITUTION:A photoelectric detector 21 is securely mounted on one piece 23a of a U-shaped carrier member 23. The carrier member 23 is pivoted with a shaft 24 on a support frame 1. A photoelectric detector 21 turns between a retreat position of not blocking the loading and unloading of a belt cassette 2 and an action position of opposing the photoelectric detector 21 to the face of a span section of an endless belt 6. The carrier member 23 is given a rotating force (counterclockwise in the drawing) with a turning spring 22 to make it turn from the action position to the retreat position. |
