Patent ID: 6295908
Filing Date: 2001-10-02
Classification: B26F,Y10T

Abstract:
An apparatus for forming a number of holes in a medium, said apparatus comprising:a punching unit for forming the holes in the medium, said punching unit including a punching roller having at least first and second sets of aligned punching studs and a parallel die roller having at least first and second sets of aligned recesses complementary to said first and second sets of punching studs, respectively, said first set of punching studs numbering a first predetermined number and said second set of punching studs numbering a second predetermined number;a selector selecting whether to form the first predetermined number or the second predetermined number of holes in the medium; anda controller controlling said punching unit based on the number of holes selected by said selector, said controller controlling said punching roller and said die roller to rotate with said first set of punching studs engaging said first set of recesses through the medium to form the first predetermined number of holes in the medium when the first predetermined number is selected, and to rotate with said second set of punching studs engaging said second set of recesses through the medium to form the second predetermined number of holes in the medium when the second predetermined number is selected.