| 摘要 |
Apparatus for the transfer of products (13) to be machined on machine tools from one working station to the next one, said apparatus consisting of a reciprocably movable carriage (1) of a plurality of gripper units (4A-4D) mounted on the carriage (1) and of a device for opening and closing of each gripper unit, said device being provided with a hydraulic cylinder (23) connected to a feed regulator (81A-81D) of a hydraulic installation, which feed regulator (81A-81D) is operable by an adjustable cam (48A-48D) on a rotatable shaft (52). The apparatus according to the invention is characterized in that the feed regulator (81A-81D) is provided with a cylinder (81) with a piston, (86), which is operable by the cam (48), the cylinder space (90) being connected to the single-acting hydraulic cylinder (23) of the gripper unit (71-78) and that the cylinder (81) is provided with a spring biased return valve (92) operable by the piston (86), the housing (93) of said return valve (92) being connected to the main feed line (31) of the hydraulic installation, this arrangement being such, that during the last portion of the active stroke of the piston (86) the return valve (92) is opened and the cylinder space (90) is connected to the main feed line (31). |
