Patent GB-412241-A (GB)
Title: Improvements in or relating to can body forming machines
IPC: B21D51/26
Filed: 1932-12-22
Abstract: 412,241. Reshaping flattened cans. FARRER, J. 0., 27, Chancery Lane, London.- (Continental Can Co., Inc. ; 100, East 42nd Street, New York, U.S.A.) Dec. 22, 1932, No. 36381. [Class 83 (iv).] Can bodies which are made flat, or flattened, for transport are reformed to cylindrical, oval, polygonal, or other form by passing them over a tapered mandrel having supports which are moved in turn into and out of contact with the mandrel. Flat bodies are stored in a magazine from which they are conveyed by feed screws 13, 131, Fig. 1, on either side, into a guideway where they are engaged by lugs on conveyer chains 22 and fed to the mandrel 40. A pair of rollers 42 are normally spring-pressed together, but yield as a body is fed between and serve to guide it on to the pointed receiving end 41 of the mandrel. The supports for the mandrel comprise rods 50 engaging recesses 52 in hardened inserts 53, the rods being moved from the mandrel for the passage of a can, but one upper and one lower rod always engaging the mandrel at each end at any time. The upper rods 50, Fig. 4, are mounted in brackets 55 and are held resiliently against the mandrel by leaf springs 86 to allow yielding in case of jamming. The rods are arranged for ready removal. The slides 56, 60 supporting the upper and lower rods respectively are actuated by cams 69 through followers 68 and rocker levers 63, against the action of springs 67. The bodies are fed towards the cylindrical portion of the mandrel by lugs on chains 90, 901 which travel in guides 103, 103<1> and serve to compress the bodies which are reshaped without undue friction on the mandrel. The final reshaping of the bodies is effected by an expanding portion of the mandrel and by bumpers acting on the parts corresponding to the edges of the flat body to smooth them to true cylindrical form. Base plates 131, Fig. 12, are held against the mandrel by springs 132, and wings 125 are secured to the plates by bolts 130 and are held outwardly by springs 136. The wings are expanded by axial movement of a slide 140, cam surfaces 145 on which engage rollers 143 to move the base plates outwardly. The slide 140 is controlled by movement of the bumper slides 148, Fig. 5, which carry bumper bars 183 pivotally mounted thereon to engage the can body on the mandrel. Eccentrics 177 control the slides through links 176. The slides are carried in bases 162, 1621 which may move to a limited degree transversely of the horn and are connected by rods 163, 164, this floating movement compensating for any lateral displacement of the horn. Feed slides are provided to carry the bodies to the expanding and bumping station, the feed dogs yielding on the backward stroke to pass over a stationary can body. The bodies are conveyed from the machine to a delivery shoot by chains 188 and 201. The mandrel is recessed to receive all the feed chains so as to be readily removable. The machine is adjustable throughout to receive different sizes of cans. The discharging conveyer may be replaced by receiving mechanism as described in Specification 412,240 and the mandrel may be longitudinally grooved as in that Specification. Specification 405,299 also is referred to.