Electric servo drive lift unit

摘要

A lift unit for a punch press comprising of a housing having a back plate mountable upon the press. A pair of upright tracks are mounted upon the back plate and spaced from a feed screw journaled upon the back plate. Spaced bearing blocks are secured upon outer edges of the carriage plate, each bearing block supporting a plurality of right angularly related cam followers operatively engaging opposite sides of the tracks and adjacent outer edges thereof for guidably mounting the carriage plate upon the tracks for reciprocal movements. A nut is secured to the carriage plate and threaded onto the feed screw. An encoder is connected to the feed screw. A programmable control or computer numerical control is connected to the motor and an electronic encoder feedback circuit interconnects the encoder with the programmable control or the computer numerical control. An angularly adjustable support cradle depends from the carriage below the housing and is adapted to mount a workpiece gripper tool adapted for programmed transverse controlled reciprocal movements relative to the press. The electronic encoder and programmable control or computer numerical control, controls the direction and number of rotations of the motor drive shaft for effecting a programmed repetitive cycle of predetermined feed movements of the carriage.