| 摘要 |
PURPOSE:To enable rapid movement of a placing part to a base part through boosting of a hydraulic cylinder by a method wherein the other end of a first hydraulic cylinder and the other end of a second hydraulic cylinder are intercoupled through a coupling member so that a moving amount is added and movement in the same direction is effected. CONSTITUTION:When pressure oil is fed in a pressure oil chamber 54a through an oil feed discharge pipe 57 and pressure oil in a pressure oil chamber 55a is discharged through an oil feed discharge pipe 58, a piston 52 is moved in the direction of an arrow mark (f), and a back plate base 27 is moved in the direction of the arrow mark (f) through a piston rod 43. Pressure oil in a pressure oil chamber 54b is fed through a flexible pipe 56 to a pressure oil chamber 55b, a piston 53 is moved in the direction of the arrow mark (f), and a slider 30 is moved in the direction of the arrow mark (f) through a piston rod 50. As a result, moving amounts of other ends 42b and 47b of first and second hydraulic cylinders 42 and 47 are added to each other by the slider 30, the other ends 42b and 47b are simultaneously moved in the direction of the arrow mark (f) being the same direction, and a back plate 4 can be rapidly moved in the direction of the arrow mark (f) through boosting of the first and second hydraulic cylinders 42 and 47. |
