GB147267A - Improvements relating to machines for trimming metal blanks - Google Patents

Abstract

147,267. White, A. E., (Waterbury Farrel Foundry & Machine Co.). April 12, 1919. Bolts and screws; nuts. -A machine for trimming blanks for nuts, bolts, screws, &c. comprises a pair of opposed cutting-tools 11, 24 relatively movable towards and away from each other, a tool-moving device to cause the tools to cut a blank placed between them and to stop cutting before the opposing edges meet, and a device to move the blank past one of the tools and a finishing-tool 14 disposed near and in alinement with one of the cutting tools. In one form the machine comprises two dies of which one 11 is fixed and the other is movable by a frame 23 actuated by toggles 33, 34 and links 50. 52 from the shaft 53. When the dies have nearly cut through the blank, the die 24 is moved back and a rod 43 adjustably mounted in a sliding frame 38 is moved forward by toggles 39, 40 and pushes the blank through the die 11 and past a finishing die 14. During this movement the stem of the blank enters a guiding bushing 61 carried by a sliding bushing 60 which is actuated by links 63, 65, 66, and a cam on the shaft 53. The bushing 61 is adjustable by means of a nut 71. A fixed stripper rod 72 adjustably mounted in a support 73 ejects the finished blank when the bushing 61 moves to the left. The blanks are fed into a shoot 80 provided with an adjustable cover 81, and are transferred by a feed or cut-off slide 83 which is actuated from the shaft 53 by cam and lever mechanism. The slide 83 has a detachable plate 831 provided with a recess 890 to receive the shank of the blank. When the slide has carried the blank into the plane of the cutters, a pair of spring feed tongs 93 carried by a slide 92 descends and grips the blank by means of detachable fingers 95. The fingers then rise while the slide 83 is withdrawn and then .descend to bring the blank into alinement with the dies. The fingers are made detachable so that thin fingers may be used for short blanks. To enable the thin fingers to be held longer in the lower position than the wider ones, the slide 92 is provided with an adjustable drive. The cutting edges of the dies 11, 24 are preferably formed by angular cuts across the face of the die. The die 24 is mounted in a slide 28 which is horizontally adjustable in a vertically adjustable slide 29. The die 11 is angularly adjustable by means of screws. The planishing surfaces of the die 14 are slightly nearer the axis of the blank than the cutting edges of the dies 11, 24. These dies may be solid or .may be made up of planer tools arranged in groups with their edges forming a circle or polygon.