Patent GB-1499302-A (GB)
Title: Material feed and clamping apparatus for a cutting machin
IPC: B23D55/04
Filed: 1976-10-11
Abstract: 1499302 Sawing GES FUR SCHNEIDTECHNIK mbH 11 Oct 1976 [31 Oct 1975] 42163/76 Heading B5L A feed and clamping apparatus for material 1 to be cut on a table 3 of a sawing machine, comprises a first pair of clamping jaws 4, 5 adapted to be guided on a stand 2 of the machine for opening and closing transversely to a feed direction of the material, and a second pair of clamping jaws 43, 44 likewise arranged to the rear of the first pair in the feed direction and movable transversely to the feed direction and also in the feed direction between stops, the second pair of jaws being open on return movement away from the first part while the first pair is closed, and being closed in the feed movement in the feed direction towards the first part while the first pair is open, both pairs being closed during a cutting operation, the second pair of jaws being mounted for movement with a roller conveyer 20 movable in the feed direction. The machine may be a circular saw, hacksaw, or, as described, a bandsaw having a saw band 13 entrained around guide wheels 11, 12 in a head 10 movable about a pivot 9 on a pedestal 8 of the stand 2 of the machine by an hydraulic piston-and-cylinder unit 14. The pedestal carries the fixed jaw 4 of the first pair of jaws, the jaw 5 of which is movable to effect clamping and release of the material 1 by a lead screw 7 driven by a motor 6. The material is supported on a table 3 which is at the same level as the roller conveyer 20 but which can be lowered by hydraulic cylinders 16, 17 during feeding movement of the material. The conveyer 20 has rollers 21 which may be drivable in both directions and has a slide block 24 at its front end slidable on guide rods 22, 23 carried by front and rear pedestals 27, 28, the rear end of the conveyer being supported by rollers 25 on a crosspiece 26 carried by the guide rods. The front pedestal is slidable transversely of the feed direction on the stand 2, and the rear pedestal is mounted on a pivot 33 whereby the conveyer can be pivoted from a position spaced from a stop 31 when the jaws 4, 5 are closed to a position engaging the stop, against which it is urged by a spring 32, so that the material is moved away from the fixed jaw 4 when the jaws are open. The conveyer is movable in the feed direction by operation of a lead screw 35 in threaded engagement with the slide block 24 by actuation of a motor 34, the movement of the conveyer being limited by engagement of the slide block with the pedestal 27 and an adjustable stop 36, the movement determining the length of material to be cut. The second pair of clamping jaws 43, 44 are mounted on a clamping frame 40 having a pair of vertica members 41, 42 vertically slidable on the front end of the conveyer. The lower jaw 43 is fixed to the members 41, 42 and the upper jaw is slidable thereon. When the jaws are open, the members 41, 42 drop to a position in which pins 50 thereon engage the frame 20 and the lower jaw is spaced slightly below the material. The upper jaw is movable to clamp the material by rotation of a pair of lead screws 46 driven by a motor 49. The material 1 is positioned on the conveyer by a fence 52, the conveyer being tilted so that the material rolls by the force of gravity against the fence. In another embodiment, the "fixed" jaw of the first pair of jaws is movable a small distance by the action of a spring away from the material when the jaws are opened.