The cutting mechanism consists of two levers, 1 and 2, connected by turning pairs C and B to tie-rod 3. One end of lever 2 bears against slide 4 of upper knife 8 and the other end is connected by turning pair D to gear rack 10 which meshes with gear 9. Gear 9 rotates about fixed axis A. Lever 1 is the slide of lower knife 7. The other end of lever 1 turns freely about axis A. When gear 9 rotates, upper knife 8 travels downward due to the weight of levers 1 and 2 and slide 4. When upper knife 8 reaches bar stock 6 to be cut off, its motion is stopped by stop nut 5. Upon further rotation of gear 9, lever 2, through tie-rod 3, raises the slide of lower knife 7 and performs the cutting-off operation.
$2567$LrG,FD$