Patent ID: 6564704
Filing Date: 2003-05-20
Classification: B30B

Abstract:
A press for pressing pulverulent materials, comprising: an upper punch unit; an eccentric crank drive for driving the upper punch unit, the crank drive having a crankshaft, a gearwheel connected to the crankshaft in a rotationally fixed manner, and a connecting rod connected between the upper punch unit and the crankshaft; two hydraulic motors each having a worm drive drivingly engaged with the gearwheel; and an electronic control unit operatively connected to the eccentric crank drive for reversing operation of the crankshaft so that a stroke of the upper punch unit is reversed shortly before each instance of reaching at least one of top dead center and be bottom dead center of the eccentric crank drive, the electronic control unit being operative to connect the two hydraulic motors selectively in parallel and in series in terms of how the motors are supplied with hydraulic medium.