Patent GB-989717-A (GB)
Title: Link mounted saw assembly
IPC: B23D59/02
Filed: 1964-04-10
Abstract: 989,717. Sawing. MORGAN CONSTRUCTION CO. April 10, 1964 [April 12, 1963], No. 14890/64. Heading B5L. Apparatus for cutting stock 124 in a rolling mill comprises a frame 14, Fig. 2, which carries a rotatable saw blade 38 and is mountad on front and rear links 8, 10 pivoted to a base 2, and means 44 for advancing and withdrawing the frame through a cutting cycle, the links co-operating to move the saw blade in a substantially horizontal path during the cutting cycle. Mounted on the base are a pair of totally enclosed and sealed bearing blocks 12c mounted on a raised portion 3. Rods 9a extend between the blocks and support respective front and rear pairs of links 8, 10 connected by rods 9b to bearing blocks 16a, 16c on the frame. A plate 26 is mounted on the frame and carries a motor 30 connected by a clutch 34 and gearing 28 to a shaft carrying the the blade 38; the clutch may incorporate means which permit the motor to come up to speed before picking up the load of the blade, a device for unloading the motor upon sudden deceleration of the blade, and a braking mechanism for rapidly stopping the blade for a blade-changing operation. Movement of the frame to move the blade through a cutting cycle is effected by an hydraulic motor 44 having a rod 46 connected by a clevis to the frame. The combined movement of the links causes the blade to move in a substantially horizontal path, the return movement being cushioned by the engagement of bumpers 45, 47. The blade is cooled and swarf removed from between the teeth by jets of fluid which are supplied from nozzles 68, Fig. 5, carried on a block 66 having a passage 70 connected to a coolant pipe 69. The block is normally urged against an upstanding lug 54 on a plate 52 by a toggle mechanism abutting a rear lug 56. The toggle mechanism can be retracted to withdraw the block so that maintenance can be effected on the nozzles. The plate 52 is adjustable by a screw mechanism 60, 65 to accommodate different diameters of blades. The blade is enclosed within a substantially semi-circular housing 76 having a curved wall 80, Fig. 7, a fixed wall 78 and a door 82 hinged at 84, 86 (Fig. 5) and releasably fastened to wall 80 by catches 88. Baffles 90 and 91 are urged by springs 100 into engagement with the sides of the blade to form a compartment 99 from which the coolant and swarf from the teeth pass to a trough 102, Fig. 2. The baffles prevent the water and swarf from being deposited on the stock to be cut. The saw is disposed adjacent the run-out table 10 of a rolling mill and a hold-down device is disposed opposite the saw and consists of a pair of rails 126, Figs. 8 and 9, which are slidable in cylinders 128 of an elevator 102 and can be advanced to the position 126(a) so that, when an hydraulic motor 106 is extended to rock the elevator about a pivot 104, they hold the stock downwardly against the table. The table has a pair of apron plates 116, 118 which can be rocked upwardly about the centres 120, 122 of the table rollers to press the stock against the arms 126, the stock thus being slightly curved so that, during sawing, it does not pinch the blade. A crowder arm 130, Fig. 2, is then advanced by a cylinder in the device 102 to urge the stock towards the side of the table adjacent the saw. When ends 131, Fig. 9, are out from the stock, the plates 116, 118 may be swung downwardly to the position shown dotted to deposit the ends in a shoot 133.