| 摘要 |
<p>PURPOSE:To realize optional setting of operational speed for a press and the like by providing the plural number of cylinder devices in a row and making the central cylinder device a double structure with two push-out driving oil chambers and one return driving oil chamber and further contriving a pressurized oil supply route to each oil chamber. CONSTITUTION:The second piston 32 inserted in the second cylinder 31 is fitted to the center of a support member 30, while the first pistons 32' inserted in the first cylinders 31' are fitted respectively to both sides of said support member. The first push-out driving oil chambers A1 and the first return driving oil chambers B1 are formed in the cylinders 31' by inserting the pistons 32', while the second and the third push-out driving oil chambers A2, A3 and the second return driving oil chambers B2 are formed by means of the piston 32 and the cylinder 31 of double structure. The oil chambers B1, B2 are put in communication with each other by means of a piping 34, and are further made connectable to the oil chambers A2 by means of a piping 33 through a selector valve V2, which can be changed over so as to allow oil supply from a supply port P2 to both oil chambers A2, A3 or only to the oil chamber A3.</p> |
