| 摘要 |
PURPOSE:To control the stop position of the apron on a movable side to a specified position irrespectively of the magnitude of load by providing a correcting plate which moves according to the oil pressure of the lifting cylinder on the movable side between a control valve and a contactor. CONSTITUTION:When a pressure oil is supplied to the lifting hydraulic cylinder of a lower apron of a hydraulic press brake, a contactor 21 ascends together with the lower apron and forces upward a sloped plate 19. Then the lower roller of a correcting plate rest 13 is pushed upward and further the bottom surface of a correcting plate 17 is pushed upward, by which the lower tip of the spool of a spool valve 9 is pushed upward. On the other hand, the pressure oil is supplied to the valve 9 and a cylinder 11 for operating the correcting plate as well as the plate 17 is moved by the cylinder 11 to the position corresponding to the oil pressure. The apron on the movable side is automatically and exactly stopped to the set position by such correcting device for the control valve. |
