Patent GB-1346567-A (GB)
Title: Apparatus for cutting lengths off a continuously moving strip of  material
IPC: B23D25/06
Filed: 1970-02-05
Abstract: 1346567 Flying shear; straightening SPALDING ENG CO Ltd 4 May 1971 [5 Feb 1970] 5507/70 Headings B3W and B3E Flying shears for cutting rod or wire comprises hydraulic drive roller means for feeding the rod through the reciprocating shear which is also hydraulically operated, the drive roller means and the shear operating means being actuated in synchronism by a common source of hydraulic pressure. As shown, a lower blade carrier 17 is movable along rails 18 and an upper blade carrier 19 is vertically movable on rods 20. A lever 22 is pivoted to the lower carrier at one end and to a radius arm 24 at the other end. A piston-rod 27 passes through a plate 28 on the lever 22. A bellcrank 29 is pivoted to the piston 27 at 40, to the arm 24 at 30 and to a tie bar 32 at 31. The tie bar 32 is freely pivoted at its upper end in the upper carrier at 33. The cylinder 26 of piston 27 and the arm 24 are pivoted to a fixed frame member at 25. In use, the piston-rod 27 is extended, a stop 34 on the rod engaging the plate 28, which causes the carrier 17 to move to the right of Fig. 1c. The bell-crank 29 pivots, pulling the tie bar 32 and with it the carrier 19 down which constitutes a shearing stroke. When the rod 27 is first retracted the blade carriers continue to move to the right until a stop 35 on the rod engages the plate 28 and the crank returns, raising the upper carrier until it contacts stops 65 on rods 20. The lever 22 now in tension and the tie bar 32 in compression act to draw the carriers to the left after, and at a faster rate than, an initial pull caused by engagement of the stop 35 with the plate 28 so that the plate 28 engages the stop 34 again at the end of the return stroke. A bar 66 guides the rod over the lower blade 21 when the carriers are moved apart. Rod, entering the machine between roller guides (11), is fed to the shear, via freelyrotatable, straightening rollers (12), (13) and 14, 15 acting in planes at right angles to each other, by rollers (10) similar to the rollers 10, Fig. 1(c) which discharge the cut lengths from the shear. Electric motors 36, 37 drive variable pressure, hydraulic pumps 38, 39 which pump oil from a reservoir 55 to drive motors 46-50 which drive the rollers 10. Motors 47 and 48 operate in series and drive rollers at opposite ends of the machine. The piston and cylinder device 26, 27 is also supplied with oil from the reservoir, through a three-way valve 52. Signals are fed from a rod-measuring wheel (not shown) to a control system for the valve 52 and valves 51, 53 and 54 which control the supply of oil to the motors 46-50. An hydraulic cylinder device (56), Fig. 3 (not shown), through a lever (60) and bar 59, draws the upper rollers 10 down on to the lower rollers, the pressure between them being maintained proportional to the driving force to prevent the rollers slipping on the rod. The straightening rollers are adjustably mounted and are reversible to bring either of two grooves into use. An alternative shear-actuating mechanism is shown in Fig. 4 which includes a second piston and cylinder device 77 for maintaining the upper blade carrier out of engagement with the rod during the return stroke of the shear. The upper position of the upper blade carrier 19 can be varied by rotation of an eccentric pin 87. A guide 67 for rod to be sheared is located adjacent the lower blade 21, which is grooved, by a quick release catch 68.