Sudden braking apparatus for press

A sudden braking apparatus for a press comprising a driving motor (6), a flywheel (5) connected to the motor through a pulley (7) and a belt (8), a small gear (9) connected to the flywheel through a rotational shaft (3) installed horizontally to a supporting frame (2), a large gear (10) engaged with the small gear and installed on a crankshaft (11b) of the press, and a cam (14) mounted at the crankshaft (11a, 11b) and connected to a slide-block (12) via a crank rod (13), characterized in that

• the apparatus comprises a circular guide (19) slidably connected to the crankshaft (11b) to rotate therewith and having a brake lining (16) on one side of the guide (19) facing the supporting frame (2), a radial toothed gear (18) located on the opposite side of the guide and a tapered groove (15) radially extending inwardly from the circumference of the guide;
• a clutch plate (22) having a radial toothed gear (21) matching the radial toothed gear (18) and fixed to a large gear (10) for rotation about the crankshaft (11b);
• and
• a shifting means which enables the circular guide (19) to move horizontally, with the shifting means mounted between the circular guide and the supporting frame (2), wherein the shifting means comprises a fork (24) installed on the circular guide
• (19) and connected to a cylinder (23) through an operating rod (26) so that the operation rod (26) and the fork (24) can shift the circular guide (19), and rollers (28) mounted on both ends of the fork (24).