| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a punching unit having one driving source without cutting off the driving force of the driving source, and to provide a post-treatment device and an image forming system. <P>SOLUTION: The punching unit 41 includes a bottom plate 76 as a first paper passing guide, a top plate 93 as a second paper passing guide, a plurality of punches 63A-63D, engaging projection parts 95A-95F, a first transmission member 64, a second transmission member 65, the driving source, and a rack-pinion mechanism 67. In the punching unit 41, the rotating force of the driving source on a rotary driving shaft 66a is converted into linear motion by the rack-pinion mechanism 67 to move the first transmission member 64 and the second transmission member 65 in opposite directions, to drive the punches 63A-63D of a first punching group or the punches 63B, 63C of a second punching group in the axial direction. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
