| 摘要 |
<p>PURPOSE: To hold a board surely with first and second pitches by injecting a pressure fluid into a bellows mechanism thereby enhancing the strength thereof. CONSTITUTION: When a plurality of hollow bellows mechanisms 23, 24 expands or contracts to a first pitch, means 33 injects a pressurized fluid into the hollow bellows 23, 24. A board is thereby held, at the end part thereof, in a recess 25 of the hollow bellows mechanisms 23, 24. An air cylinder 32 then expands or contracts the recess 25 in the hollow bellows mechanisms 23, 24 from the first pitch to a second pitch thus arranging the board at the second pitch. When the hollow bellows mechanisms 23, 24 are expanded or contracted to the second pitch, the means 33 injects a pressurized fluid again into the hollow bellows mechanisms 23, 24. This structure enhances the strength of the bellows mechanism which is thereby protected against sinking due to external force or bending due to the self-weight.</p> |
