Patent ID: 6014920
Filing Date: 2000-01-18
Classification: B26D,B26F,B65H,G03G,Y10T

Abstract:
A paper-punching device for use in an image-forming apparatus comprising:guiding means for guiding a sheet of paper along a paper transport path in a predetermined transporting direction;transporting means for transporting a sheet of paper along the guiding means at a transport speed;punching means having a punching blade for forming a punch hole in a sheet of paper while said sheet of paper is being transported by the transporting means, the punching means being situated in the guiding means; andpunching device shifting means for automatically shifting the punching means to one or more hole-punching positions with respect to said sheet of paper while said sheet of paper is being transported said shifting means moving the punching means at a predetermined angle in a direction transverse with respect to the transporting direction and at a shifting speed that is a function of both said predetermined angle and said transport speed.