CISAILLE MECANIQUE POUR COUPER DE PART EN PART DE GROSSES PIECES METALLIQUES, COMME DES LINGOTS, DES BRAMES, DES BILLETTES, OU ANALOGUES

摘要

A drive cutter blade and a backing cutter blade are mounted in a frame and relatively movable toward and away from each other to cut through a workpiece disposed between them. An eccentric drive mechanism is connected to said driven cutter blade and operable to perform alternating cutting strokes in the direction from said driven cutter blade toward said backing cutter blade and return strokes in the direction from said backing cutter blade toward said driven cutter blade. Said cutter blades are adapted to be spaced apart a distance which exceeds the extent of one of said strokes. One of said cutter blades is a follow-up cutter blade. Follow-up drive means are connected to said follow-up cutter blade and adapted to impart to said follow-up cutter blade a follow-up movement toward the other cutter blade during each of said return strokes. Said follow-up drive means comprise a hydraulic actuator connected to said follow-up cutter blade, a hydraulic supply conduit connected to said actuator and adapted to supply liquid under pressure thereto in the direction of said follow-up movement, a shut-off valve incorporated in said conduit, and means for closing said shut-off valve during said working strokes to block the supply of liquid to said actuator and for opening said shut-off valve during said return strokes to permit of a supply of liquid to said actuator A workpiece having a thickness exceeding the extent of one of said strokes can thus be cut through in a plurality of cutting strokes and both said cutter blades remain in contact with said workpiece during said return strokes.