GB1442471A - Oscillating shears - Google Patents

Abstract

1442471 Flying shears SCHLOEMANNSIEMAG AG 19 Aug 1974 [18 Aug 1973] 36332/74 Heading B3W A pendulum shear 2 for cutting a moving strand 24, particularly from a rolling mill or a continuous casting machine, comprises a frame 3 oscillatable about a pivot 4 and carrying a reduction transmission which has a rotary input 5, for coupling to a drive motor (not shown), disposed substantially normally to the axis of pivot 4. The reaction transmission comprises a worm 6 which via a wheel 7, shaft 8 and gears (9, 9<SP>1</SP>, 11, 11<SP>1</SP>) Fig. 2 (not shown) actuates a shaft 10 which reciprocates the lower blade holder 14 via an eccentric 12. The blade holder 14 is locked in the starting position shown by a spring catch 22. The coupling to the motor includes a pneumatic clutch 25, a flywheel 26 and a universal or cardan shaft 28. In operation with a strand 24 moving in the direction of the arrow, the clutch 25 is engaged to raise the blade holder 14 thus releasing the catch 22. As the blade 16 cuts into the strand the frame 3 is pivoted, returning automatically to the starting position when the strand is severed since the centre of gravity of the frame is offset to the input side of the pivot 4. Two or more adjacent shears cutting in the same vertical plane Fig. 3 (not shown) are universal or cardan shafts (28) (28<SP>1</SP>, &c.) coupled to motors (27) (27<SP>1</SP>, &c.) by bevel gears (29), (29<SP>1</SP> &c.) and further shafts (30), (30<SP>1</SP> &c.).