Apparatus for punching sheet

The apparatus for punching a sheet S includes a shaft 2 extending transversely relative to the moving direction of the sheet S; a pair of cams 3, 3 mounted to the shaft 2 in both longitudinal end portions for rotating together with the shaft 2; a tie bar 4 extending along the shaft 2 and having a pair of cam followers 41, 41 at positions corresponding to those of the cams 3, 3; a plurality of punches 5, 5 connected to the tie bar 4 in longitudinal arrangement for being movable to and from punching positions; a frame 7 extending along the tie bar 4, to which a plurality of punch guides 6, 6 are fixed in alignment with the punches 5, 5; and a die frame 8 having a plurality of die holes 81, 81 in alignment with the punches 5, 5 for cooperating with the punches 5, 5 to make holes in the sheet S.