Upper blade 1 is mounted on slider 2 which reciprocates in guides a of frame 7. Frame 7 turns about fixed axis A. Slider 2 is driven by piston 6 which reciprocates in stationary steam cylinder 5 and is connected by turning pair B to connecting rod 4. Connecting rod 4 is connected by turning pair C to slider 2. Rocker arm 3, turning about fixed axis D, is connected by turning pair C to connecting rod 4. In shearing stock 9, piston 6 of steam cylinder 5 moves downward, frame 7 turns in the direction of the moving stock and blades 1 and 8 make the cut. Lower blade 8 is secured rigidly to oscillating frame 7.
$3987$LHP,FD$