Patent ID: 7574891

Claim:
A pressing apparatus, comprising: a base; a support plate held in parallel to the base via a plurality of guide columns vertically provided on the base; a slider for sliding on the guide columns such that said slider moves in an upward direction and a downward direction between the base and the support plate; a first motor attached to the support plate for driving said slider in said upward direction and said downward direction; a second motor for moving said slider in said upward direction and said downward direction such said slider presses a work piece, a screw shaft attached to a rotation shaft of the first motor, said screw shaft driving said slider relative to the base via rotation of the first motor; a ball screw nut connected with a ball screw section provided in the screw shaft; a lock device that integrates the screw shaft and the support plate; a slider moving mechanism including an input shaft, said slider moving mechanism reversibly rotating the ball screw nut with respect to the screw shaft via a rotation torque from the input shaft when the screw shaft and the support plate are fixed by the lock device, said ball screw nut being fixable to the slider via said slider moving mechanism, said second motor rotating forward and reversely, said second motor providing rotational torque to the slider moving mechanism via the input shaft; and a position detector provided for a set of the first motor and the second motor, the position detector detecting a position of the slider.