| 摘要 |
An elevation stage is moved up and down with its pins guided in vertical grooves in a side wall by first and second cams. The first cam is equipped with a zigzag groove and periodically reciprocates. The second cam reciprocates while keeping a predetermined phase difference from the first cam. When the pin reaches a branch point of the zigzag cam groove depending on the rotating direction of a rotary cam for moving each cam, the second cam supports or does not support the cam, and ascension and descension are thus selected. The apparatus is simple in construction, has a small size, high load resistance and long durability, and is suitable for recording and/or reproduction apparatus.
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