Patent ID: 8770079

Claim:
A sheet hole punching device comprising: a plurality of punching members having first and second groups; a device frame bearing-supporting the plurality of punching members to vertically move the punching members in a hole punching direction, the plurality of punching members being arranged linearly on the device frame; a driving rotation shaft disposed in a direction crossing the punching members; a driving motor reciprocally rotating the driving rotation shaft within a predetermined angular range; a gear mechanism transmitting a rotation of the driving rotation shaft as a rotational movement to each of the punching members; cam mechanisms converting the rotational movement of each of the punching members into a vertical movement in the punching direction at a same time of the rotation; and a motor control device to control the drive motor, wherein the gearing mechanism includes drive gears fixed on the drive rotational shaft, and receiving gears disposed on the punching members to engage with the drive gears, each receiving gear engaging each punching member so that the punching member slides in the punching direction and rotates, and each cam mechanism includes a cam follower formed integrally with the punching member, and a cylindrical cam fixed to the device frame, the cylindrical cam having a V-shaped groove cam to reciprocate each punching member between an upper dead point and a lower dead point with respect to the rotation within the predetermined angular range.