Patent ID: 7090120
Filing Date: 2006-08-15
Classification: B26D,B26F,G03G,Y10T

Abstract:
1. A sheet punching device, which cuts holes in a sheet conveyed at predetermined intervals while punches are entering die holes, said sheet punching device comprising: a plurality of punch trains, each of which includes a plurality of said punches axially aligned on a rotating shaft and projecting in a radial direction of said shaft; and a plurality of initial position detecting sensors, which are disposed in correspondence with said plurality of punch trains respectively, and detect an initial position of each of said plurality of punch trains in a rotation direction of said shaft, wherein said plurality of punch trains are disposed with a phase difference in the rotation direction of said shaft relative to one another, and said die holes are disposed in correspondence with said plurality of punches, wherein one of said plurality of punch trains is selectively used in cutting holes in the sheet at a predetermined timing corresponding to sheet conveyance intervals, and wherein one of said plurality of punch trains selected for use, is set at the initial position based on a signal from said plurality of initial position detecting sensors.