Patent ID: 7823494
Filing Date: 2010-11-02
Classification: B26D,B26F,G03G,Y10T

Abstract:
1. A sheet hole-punching device, comprising: a plurality of punch members, each punch member having a leading end with a hole-punching blade; a base frame for movably supporting the punch members in a hole-punching direction; a drive motor for driving the punch members; transmission means for transmitting rotational force of the drive motor to the punch members so as to rotate the punch members and to reciprocally move the punch members in the hole-punching direction, the transmission means being disposed between the drive motor and the punch members and comprising a gear rack linearly moving between first and second home positions by the drive motor, and passive gears formed on the punch members for mating with the gear rack to rotate the punch members; and a plurality of cam means, a cam means of the plurality of cam means being disposed between the base frame and each punch member of the plurality of punch members, for converting a rotational movement of the punch members into a hole-punching direction movement so as to move the punch members in the hole-punching direction while rotating the punch members.