PROBLEM TO BE SOLVED: To smoothly open and close and move a punch blade holder and prevent dropping of oil on a corrugated fiberboard on a slot punching machine for the corrugated fiberboard on which a plural number of blade units consisting of base blade holders and punch blade holders axially supported on them free to open and close are arranged in parallel free to crossly move and which is opened and closed by an eccentric shaft mechanism. ;SOLUTION: Side part frames 41, 43 are axially supported free to open and close on both end parts of a main body frame 1 as a framework of arrangement of a punch blade holder, a lateral frame 45 with which the punch blade holder 30 is engaged free to move is installed between the side part frames 41, 43, additionally, eccentric shaft mechanisms 3, 3 are equipped on both end parts of the main body frame 1 by installing a rotary shaft 15 between both of the left and right end parts of the main body frame 1, the side part frames 41, 43 are respectively connected to their driving arms 21, 21, and as a roller 47 is engaged with a guide groove 44 of the lateral frame 45 going up and down, each of the punch blade holders 30 is simultaneously made to go up and down.;COPYRIGHT: (C)1998,JPO
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