Sheet hole punching device

A sheet hole punching device for punching holes in a sheet, comprising:

• a plurality of punching members;
• a device frame supporting the plurality of punching members thereon linearly to vertically and slidably move the punching members in a hole punching direction;
• a driving rotation shaft disposed in a direction crossing with the punching members;
• a drive motor reciprocally rotating the driving rotation shaft within a predetermined angular range;
• a gear mechanism attached to the driving rotation shaft for transmitting a rotation of the driving rotation shaft as a rotational movement to the punching members;
• cam mechanisms attached to the punching members for 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 gear mechanism includes drive gears fixed on the driving rotation shaft, and receiving gears engaging the drive gears to transmit a rotational movement to the punching members, and
• each of the cam mechanisms includes a cylindrical cam formed integrally to the punching member and having a V-shaped groove, and a cam follower fixed to the device frame and engaging the V-shaped groove, the cam mechanism reciprocating each of the punching members between an upper dead point and a lower dead point with respect to rotation thereof within a predetermined angular range.