GB652317A - Machines for manufacturing umbrella ribs from strips of sheet steel bent to u- or v-shape - Google Patents

Abstract

652,317. Making umbrella ribs. INDUSTRIAL-HOLDING-ESTABLISHMENT. May 25, 1948, No. 14156. Convention date, May 29, 1947. [Classes 83 (ii) and 83 (iv)] Punching ; shearing ; jointing by stamaping.- A machine for making umbrella ribs from strips of sheet steel bent to U or V-shape, Fig. 1, comprises a strip feeding device 6, Fig. 12, a clamping device 33, 34, for interrupting the feed, an annealing device A, and, each spaced apart by one rib length, a wire inlaying, wire enclosing and wire flattening device B, a hole punching and severing device C, and a movable abutment 11 which, by the feeding of the stock 1, operates a clutch 21. which actuates the said devices A, B, and C, and the clamping device through a cam-shaft 15 for a simultaneous operating cycle. After a completed rib has been cut off at C and dropped and the pressure on the stop 11 thereby relieved, the clutch is automatically disengaged, the shaft 15 is stopped and the rib feed is released to initiate a fresh operating period. U-sectioned strip 1 is fed by rollers 6, 7, up to the spring-loaded stop 11, which is thereupon displaced to the right, forcing a rod 14 to the left through a lever 13, actuating clutch 21 to couple the shaft 15 to the motor 25. A notched disc 28 then raises a plunger 31 to cause the wire to be gripped between blocks 33, 34 and the idle feed roller 6 is raised to stop the feed. At the bending station B, a length is cut by a lever 49 from a soft steel wire 43 which is fed against a stop by rollers 46, 47, and placed in the rib, pressing tools, 50a, 50b, mounted on the levers 50, 51 then operating to bend the rib material around the wire at 55, 56, 57, Fig. 11, and flatten the inlaid wire at 58, 59. After a combined shearing and punching tool 64, 65 has severed the foremost rib from the strip by cutting out a portion between the two ribs and simultaneously shaping the rib ends 3, and punched out the holes 67, Fig. 1, in the adjacent ends of the first two ribs, the completed rib falls into a channel 67a, thus releasing the pressure on the stop 11 which returns to the left. The clutch is thereby disengaged and the clamping device opens, allowing the strip feed to operate to push the strip once more against the stop 11. The devices A, B and C are adjustably mounted to allow of the manufacture of different lengths of ribs.