| 摘要 |
PURPOSE: To provide an operating mechanism for a three-position switching device, which has a structure capable of being reduced in size and simplified and is less liable to cause a malfunction relative to both automatic operation and manual operation. CONSTITUTION: An operating shaft 15 is rotated by a worm 14 and a worm wheel 16, thereby moving a projection part 17, A pair of catch levers 19a, 19b allow the projection part 17 to advance/retreat between confronting end parts thereof. A pair of latch pins 20a, 20b are provided that are turnably supported at withdrawal positions of the end parts of the catch levers, each having a half-moon shaped part with a half-moon shaped cross-section at its portion corresponding to the withdrawal position. the outside of the half-moon shaped parts hindering the withdrawal of the end parts of the catch levers, while the inside of the half-moon shaped parts allowing the withdrawal of the end parts of the catch levers, A stopper block 23 limits the extent of rotating angle of the worm wheel by the projection part 17 abutting thereon. The main shaft is rotated by a motor 1 in the event of motor drive, and the main shaft is rotated by means of a manual operation shaft 28a or 28b in the event of manual operation.
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