GB704325A - Improvements in means for sawing off lengths of tubing or other lengths of material - Google Patents

Abstract

704,325. Circular saw machines. TUBE MAKING MACHINES, Ltd. May 31, 1951 [June 7, 1950], No. 14173/50. Class 145 (2) Lengths are sawn-off continuously moving tubes or the like by a sawing machine of the type in which the saw moves with the work on a carriage travelling on a base frame; and comprising a base frame, a movable carriage mounted thereon, a clamp for fixing the carriage to the work piece so that it travels therewith during the sawing off process, means for returning the carriage for the next sawing off process, an arm carrying a circular saw and a saw motor (the arm being pivotally mounted on the carriage to move the saw away from the work piece) and a cam bar which holds the sawcarrying arm in the sawing position and controls the cutting feed of the saw. The saw arm coacts with the cam bar so that it is free to lift away from the cam bar against the pressure applying the saw to the work piece during the sawing operation. The carriage 5 is mounted on rollers 5a running on guide rails 6 carried by the machine frame. The saw 1 and motor 2 are carried on an arm 3 which can be lifted by a piston 8 so that the saw clears the work A, or lowered until the roller 10 rests on the-inclined cam bar 9. Each end of this cam bar is adjustable for controlling the rates of feed of the saw. A clamp 13 mounted on the carriage and actuated by a piston in a compressed air cylinder 15 grips the work when the saw is in operation. The compressed air cylinders are operated by valves actuated by the carriage in its travel. The inertia of the stationary carriage is overcome by an air pressure acting on plungers which also act to cushion the return stroke of the carriage. The return stroke of the carriage is operated by a weight 41.