Patent GB-649826-A (GB)
Title: Improvements relating to wire-bending machines
IPC: B21F43/00
Filed: 1948-02-27
Abstract: 649,826. Corrugating. HARRIS LEBUS, Ltd. Feb. 27, 1948, No. 6195. Convention date, Dec. 24, 1940. [Class 83 (iv)] In a machine for corrugating wire, cam-operated bell cranks 22, 23, Fig. 12, in two rows on both sides of the wire 44 and carried by a drum 9 swing alternately from each side across the path of the wire moving tangentially to the drum. The bell cranks 22-23<SP>1</SP> are pivoted in two rows on the drum face in radial holes 30 and are spring-loaded torsionally so that the arms 25 are normally retained to the side of the drum clear of the wire 44. Alternate bell cranks in each row have downwardly or upwardly projecting cam faces 28 so that they are actuated by the lower or upper arms 35-36<SP>1</SP> respectively on cams 21, 21<SP>1</SP> pinned to gear shafts 15, 15<SP>1</SP> in the drum drive and rotating synchronously therewith. After actuation by the cams the bell cranks are locked with the arms 25 across the drum and holding the wire by vertically projecting lugs 29 on the bell cranks which run into circumferential channels 131 in a cam member 130 mounted on the machine frame above the drum 9. Ejectors 46 radially mounted on the drum are operated by a stationary cam 55 on the housing 2 to push the bent wire clear of the bell cranks and are returned to a position flush with the drum face after ejection by springs 54 or may be positively actuated by running grooves in the ejector heads over an eccentric ring. The wire 44 is fed to the drum through a feed guide 57, Fig. 3, carrying a holding down finger 80 which yieldingly pivots from side to side following the wire and which may be adjusted vertically about a pivot 70 to raise or lower the wire by a screw 73. A cam 61 mounted under the feed guide automatically spreads the bell crank arms 25 to each side in the event of failure of the springs to return them fully after release by the cam member 130. The corrugated wire leaves the machine through a wide-mouthed gap between two plates 91, 92, the top plate 92 carrying two pivoted arms 94, which yieldingly hold the wire down over the bell cranks by the action of spring 99 which allows the arms to ride over the bell cranks. In modifications the bell cranks may be arranged in spaced groups round the drum for intermittently corrugating the wire. The latter may be gripped to the drum by each leading bell crank which wedges the wire against a stop on the drum periphery. The initial and final corrugations may be made shorter by using leading and trailing bell cranks with shorter arms. An initial length of straight wire may be set by running the wire up to a longitudinally adjustable stop on the far side of the drum (not shown), lateral movement of the wire under the initial bending action causing it to free itself from the stop. The drum 9 is driven on the shaft 8 by two oppositely rotating motors 20 over each end of the shaft geared to hubs carrying circumferentially adjustable gear rings which permit adjustment between the relative positions of the bell cranks 22-23<SP>1</SP> and the cams 21, 21<SP>1</SP>. Lubricating work.-The drum runs in oil at the base of the machine casing 2 for lubrication of the parts and brushes 133 remove the oil from the finished wire.