| 主权项 |
1. An automatic electric punching apparatus comprising:
a body comprising a plate-shaped base member provided with a pair of punch pads at a rear side of an upper surface thereof, a lower block having a rectangular parallelepiped shape and in which a pair of bushing nuts are vertically buried, the lower block defining a paper insertion opening having a predetermined interval at a rear side of an upper surface of the base member, an upper block installed at an upper side of the lower block to be moved upward and downward and in which a pair of bearings are buried, and a cover covering the upper block and the lower block; a driving unit comprising a motor positioned on and fixed to a upper surface of the upper block while a rotary shaft thereof passes through the upper block, a driving gear mounted to the rotary shaft of the motor and installed on a lower surface of the upper block, and a pair of driven gears engaged with the driving gear to be rotated; a punching unit comprising a pair of screw punches provided for punching at lower ends thereof, having a tubular shape having a screw thread on an outer peripheral surface thereof, mounted to bearings of the upper block while an upper end thereof passing through the driven gears, and having central portions coupled to the bushing nuts buried in the lower block to be moved upward and downward; and a control unit comprising a switch unit installed on a front surface of the cover, a sensing unit for restricting an upward and downward movement distance of the upper block by means of the screw punches and the bushing nuts, and a printed circuit board for controlling driving of the motor according to signal inputs from the switch unit and the sensing unit. |
