MACCHINA PER TAGLIARE A MISURA PUBBLICAZIONI,FOGLI DI CARTA OD ARTICOLI SIMILARI DISPOSTI A PILA

摘要

A hydraulically operated cutting machine has a machine frame; a knife bar movably supported on the frame; a hydraulic power cylinder; and a bell crank lever operatively connecting the power cylinder with the knife bar for moving the knife bar into a lower cutting position and a raised position. The bell crank lever is articulated to the machine frame at a fixed center of rotation and the hydraulic cylinder is articulated to the bell crank lever at a first displaceable center of rotation spaced from the fixed center of rotation. An actuating rod is articulated to the knife bar and further to the bell crank lever at a second displaceable center of rotation spaced from the fixed center of rotation. The first and second displaceable centers of rotation travel, respectively, along a first and a second circular path as the bell crank lever pivots about the fixed center of rotation. The centers of rotation are so arranged with respect to one another that in the lower cutting position of the knife bar the second displaceable center of rotation has at least reached its lowermost position along the second circular path.