Kreissaegemaschine

摘要

1,125,489. Sawing. KEURO MASCHINENBAU G.m.b.H. & CO. K.G. 20 Sept., 1966 [14 Oct., 19651, No. 41952/66. Heading B5L. A sawing machine for cutting apart a workpiece 21 of large cross-sectional dimension and preferably of metal comprises two circular saw blades 10, 101 with their driving means rotatably mounted at a small distance from each other and within the same vertical plane on a slide carriage 6 movable in a vertical direction within a machine frame 1 by hydraulic units 2, 3, 21, 31, the bearing means of the saw blades being shiftable horizontally by an adjusting device 13, 14 which shifts both saw blades at the end of the downward movement of the slide carriage in their vertical plane towards one side for a distance at least equal to the distance between the saw blades so that, during a following upward movement of the slide carriage, one of the saw blades will cut the web remaining between the two parts of the workpiece. The slide carriage 6 is vertically movable in the frame 1 by a pair of hydraulic piston-and-cylinder devices 2, 3, 21, 31 and has a pair of pivots 8, 81 respectively supporting levers 9, 91 carrying the circular saw blades 10, 101 at their lower ends. The upper ends of the levers have nuts 11, 111 engaging oppositely handed threaded portions of a spindle 12 which is adjustably rotatable to vary the spacing between the saw blades and is connected to a piston 13 in a cylinder 14 whereby the saw blades can be moved simultaneously sideways in their vertical plane. Initially, hydraulic fluid as constant pressure is supplied to conduits 5, 51 to raise the slide 6 and to conduit 15 to move the saw blades 4 to the left as seen in the Figure. The motors driving the saw blades are started so that the blades rotate in opposite directions 22, 221 and hydraulic fluid at higher pressure is supplied to conduits 4, 41 to move the slide 6 downwardly and engage the saw blades with the workpiece. When the blades have out through the workpiece, an arm 71 actuates a switch 19 controlling the high pressure fluid supply to a conduit 16 whereby the spindle 12 is moved to the left and the blades to the right a distance at least equal to the distance between the blades to cut through the lower portion of the web between the workpiece parts. When the spindle actuates a switch 17, the high pressure supply to conduits 4, 41 is discontinued so that the slide rises and the web is cut through, a limit switch 18 terminating the sawing operation.