| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the horizontal rotational vibration of a cam holder and to prevent the vibration noise in a sheet punching device for forming a punched hole on a sheet fed out from a copying machine and the like by rotatably journaling a punching rod on a part of the cam holder to be fitted to an outer periphery of an eccentric cam. SOLUTION: When a sheet on which an image is formed by an image forming device, is conveyed into a sheet punching device, the sheet is entered into a sheet conveying path 51 between a frame body 49 and a punching die 50, and the passage and the residence of the sheet are detected by a sensor flag and a sheet detecting means. When a punching command is output, a driving shaft 38 is rotated in a state that a punching rod 47 is raised, and the cam holder 45 fitted to the outer periphery of an eccentric cam 44 is rotated about a supporting shaft 46 by the rotation of the eccentric cam 44. Whereby the punching rod 47 of which the operation is regulated by the supporting shaft 46 and a punch guide 48 is downwardly pressed, and the sheet is punched by the engagement of a punching edge and an engagement hole 50a.</p> |
