JPS6157128B

A shearing machine for severing parallel longitudinal members of grids or gratings has a horizontal guide-beam (9) which is stationary during the cut and upon which are provided counterbutts (17) in the manner of comb teeth; and a cutter-beam (10) which is movable parallel to and alongside the guide-beam during the cut and upon which blades (18) are provided in the manner of comb teeth, the blades cooperating with the counterbutts on the guide-beam to shear longitudinal members extending through notches (19,20) formed between adjacent counterbutts of the guide-beam and between adjacent blades of the cutter-beam. The guide-beam and the cutter-beam are guided in a machine frame for vertical movement into and out of a working position in engagement with a grid or grating and are associated for common motion in the vertical direction. Opposite to each of the two end faces of the guide-beam a respective stop-face (13,14) is provided; and opposite to each of the two end faces of the cutter-beam is arranged a respective single-acting fluid pressure-operated cylinder (5,6) which is fixed to the machine frame and has a piston (3,4 ) with a piston rod (15,16) formed at its end a thrust face for the respective end face of the cutter-beam for imparting to the cutter-beam a stroke parallel to the guide-beam and away from that cylinder to which fluid pressure is applied at that time.