RAKE ANGLE ADJUSTING DEVICE OF HYDRAULIC SHEARING MACHINE

摘要

PURPOSE:To adjust a rake angle not only for upper right, but also for upper left by separating a ram driving means from a rake angle setting means when the ram driving means is lowered or elevated, so as to extend the stroke of one of a pair of ram driving means. CONSTITUTION:When a head side chamber 39 of a first ram driving cylinder 9 is connected to an oil container, the piston of a second ram driving cylinder 11 is pushed up, and the piston of the first ram driving cylinder 9 is pushed up to a stroke end, so as to push up a ram 7 to the upper end, and a third opening valve 43 is thus opened. When a pinion 49 is turned, and a sprocket wheel 45 is moved to a small degree, so as to open a first opening valve 25 to a small degree, since the working oil in a communicating tube 17 flows in the oil container, the piston of the second ram driving cylinder 11 is pushed up, and reaches a condition R where a rake angle is in upper right position. When the pinion is turned in reverse way, so as to open a second opening valve 27 to a small degree, since the low pressure working oil in a pipe passage 37 is flown into the communicating tube 17, the piston of the second ram driving cylinder 11 is pushed down due to the differential acting, and the rake angle is in an upper left condition L.