Drive for the movable work component, such as the ram of a press, stamping machine or the like

A punch press machine comprising:

• a machine housing;
• a crank drive mounted within the machine housing and including a crankshaft;
• hydraulic drive means connected to drive the crankshaft;
• source means for providing hydraulic fluid under pressure, said source means being connected to the hydraulic drive means for operation thereof;
• a punch member connected drivingly to the crank drive so as to be reciprocated thereby along an axis defined by the machine;
• and
• adjustment means whereby the position along said axis of the mean position of said punch member during reciprocation thereof may be adjusted, said adjustment means including an externally threaded spindle member, an internally threaded nut member in threaded engagement with said spindle member, one of said threaded members being connected to said punch member and the other threaded member being so located in the machine that rotation of said other member brings about linear movement of said one member thereby to adjust the mean position of said punch member, said adjustment means further including hydraulic locking means for locking said other member against rotation, said hydraulic locking means being connected to said source means for operation by hydraulic fluid provided thereby.