PURPOSE: To guarantee the possibility of reproducibility of a ram position, ram cant and pressurizing pin force occupying just before suspending a drawing operation during 'intermediate stop' without an additional device.
CONSTITUTION: A drawing cushion force is changed into a value compensating inertia on which a thin sheet holder 6 and a working thin sheet 5 act without variations of an attitude, a clamp locking device 4 of a drawing device is operated in order to secure the drawing device 3 at the intermediate stop position as a regulation, whereby the drawing device is kept in at least a low energy state, and a ram returning stroke is started. In between first several mm of a returning stroke movement distance of the ram, in order to mutually move press dies 7 spaced apart as a regulation in the state that an existing ram cant is maintained depending on the situation, the ram returning stroke is aided toy the opposed cylinder 10 of a ram parallel holding mechanism 2 and also a prescribed opposing pressure is imparted to a work cylinder 12 of a ram driving device 1.
SHIYUTEFUEN SHIYUMITSUTO
BUIIRANTO PETSUTAA
ANDOREASU SHIYURAAKU
