Patent GB-408622-A (GB)
Title: Improvements in and relating to machines for cutting and forming articles from stripmetal
IPC: B21D35/00
Filed: 1932-09-12
Abstract: 408,622. Cutting and forming articles from strip metal. ASSOCIATED MANUFACTURERS, Inc., Ampere, New Jersey, U.S.A. Sept. 12, 1932, No. 25394. Convention date, Sept. 10, 1931. [Classes 83 (ii), 83 (iii), and 83 (iv).] A machine for cutting and working metal and described particularly with reference to the production of a rotary. beater, Fig. 24, for an egg whisk, comprises a base 25, Fig. 2, on which is mounted a bedplate 26 carrying four camshafts 29-32, Fig. 1, arranged as a quadrangle, intermeshing mitre wheels being fitted at the shaft ends. The shaft bearings are split horizontally and the bottom brasses are removable by rotating them round the shaft by a spanner 59, Fig. 5, so that any one shaft may be dismounted without interference with the remaining shafts. The machine is driven by an electric motor 41 and reduction gearing 42, 45 driving on to the camshaft 29, a clutch operated by a handlever 48 being interposed in the drive so that the machine may be turned over by a handwheel 44 for checking the operations of the machine. The driving motor, handwheel and clutch mechanism are all mounted as a unit on a panel 52, Fig. 2, adapted to be bolted to the base 25, the motor being adjustable by screwgear 49 to facilitate varying the gear ratio. When the machine is in operation, the handwheel 44 functions as a flywheel. The stock 66, Fig. 1, enters the machine by way of a guide 78 and a straightening device 67 mounted on an arm 247 carried by the bedplate. The guide comprises a fixed but horizontally adjustable vertical roller and a fixed but vertically adjustable horizontal roller 79, Fig. 7, these rollers forming with similarly mounted rollers on a pivoted frame 88 an enclosure supporting the work on all sides. The pivoted frame is locked in closed position after insertion of the work by a screw 90. The straightening device comprises staggered rolls 68, 69, Fig. 6, carried by slides 71 which are adjusted by screws 75 and locked by screws 73. The strip may be fed either by rolls or by a reciprocating gripper. The roll feed comprises a pair of intergeared, continuously driven rolls, 93, 94, Fig. 9, one of which is intermittently reciprocated by a bell crank 102 actuated by a cam 106 on the shaft 32, the cam arm of the bell crank being disengageable from the cam by hand controlled eccentric 109, to render the feed inoperative. The strip may be corrugated and knurled by rolls which are intergeared and intermittently rotated either by the drag of the work, or positively, by a ratchet gear 290, Fig. 29, driven by an eccentric 293 mounted on a shaft coupled to the camshaft 31. The corrugating rolls, when positively driven, may serve as feed rolls. When a reciprocating gripper feed is employed, a bracket 200, Fig. 16, which carries an adjustable crank 204 and linkage 206, 207, 209 is bolted to the bed 25, with the crank gear in mesh with a spur gear on the camshaft 31. The link 209 drives a rod 210, Fig. 17, actuating a member 213 which is pivoted at 219 and is rotatable thereabout through a small angle determined by adjustable stops 234, 235 carried by a slide 212 mounted on guides 239. The slide is provided with a fixed jaw 236 with which the rocking jaw 229 co-operates to grip the work 66. The pivot 219 is formed as a hand operated eccentric whereby the feed is rendered inoperative. The feed slide moves along its guides under constantly applied spring braking, to avoid lost motion. The strip is positively held during rearward motion of the feed slide, by a cam operated plunger working transversely to the line of feed. Limit stops 240, 241, Fig. 16, for the feed slide are provided on the guides. The advanced strip passes between tools carried by rams 120, Fig. 13, and a stationary die head 119, the tools comprising punches 149 forming the holes 183, Fig. 24, dies 152, 153 and 158, 159, Fig. 13, forming the corrugations 171, Fig. 24, a punch 155, Fig. 13, forming the hole 157, Fig. 24, and a shearing cutter 160 for cutting off the previously advanced strip which has meanwhile been positioned ready for bending. The bending tools comprise a fixed former 162, a horned slide 164, side benders 172, 173 and an end bender 184, the various slides being driven by cams on the cam shafts. The side benders are hinged to their operating slides and move in cam grooves which withdraw the benders below the plane of the work on retraction. The slide 164 carries a tool 165 which flanges the metal around the hole 157, Fig. 24, to form a bearing 168. The work springs open and falls on withdrawal of the benders, but a positive ejector 193, Fig. 2, may be fitted, the ejector being actuated by a cam and lever 194 whose pivotal centre may be varied. The die-carrying rams may be mounted in guides 122, Fig. 26, which are bolted to the bedplate and which project to form local bearings 146 for the camshaft, these bearings being additionally supported by a bridge 267 coupled, after adjustment by wedges 270, 271, to the fixed die holder 274, which is itself adjustable by shims 278 relatively to a fixed rib 128 on the bedplate. The dies are clamped to the holder by plates 279, 280. The cam levers are extended to give positive actuation of the die rams in both directions. The rotary motion of the shafts may be employed to perform drilling, reaming, tapping and screwdriving, and the reciprocating motion may be utilized for riveting, pressure-welding, or for forcing parts together.