Two identical rigidly attached round eccentrics, 1 and 2, rotate about fixed axis A. Levers 5 and 6 have shear blades b and a, turn about fixed axis B and carry rollers 3 and 4 which roll along the contours of eccentrics 1 and 2. Flexible link 7 has one end attached at point C to lever 5, runs over pulley 8, rotating about fixed axis F, and has its other end attached through spring 9 at point E to lever 6. When eccentrics 1 and 2 rotate, blades a and b have a shearing motion.
$3587$CFL,FD$