Patent GB-388958-A (GB)
Title: Improvements in or relating to can closing machines
IPC: B21D51/32
Filed: 1932-05-07
Abstract: 388,958. Assembling and seaming can heads and bodies. CONTINENTAL CAN CO., Inc., 100, East 42nd Street, New York, U.S.A.-(Assignees of Troyer, N. and Pearson, P. E. ; 601, Myrtle Street, Seattle, Washington, U.S.A.) May 7, 1932, No. 13228. Convention date, May 7, 1931. [Class 83 (iv).] Embossing.-An assembly mechanism for can ends and bodies prior to seaming, comprises guideways which are relatively inclined, and cause the forward edges of the ends to seat in the bodies before the rear edges, a pair of arms being actuated synchronously with the feeding mechanism to contact and guide the bodies and ends on both sides. Oval can bodies C, Fig. 3, pass down a shoot 27a and are fed and spaced by a worm 38 while resting on chain conveyers 24, 30, and urged towards the worm by counterweighted levers 47, 50, the latter controlling mechanism of usual form to release the clutch of the end feed device in the absence of a body. During the passage through the machine a conveyer 27 replaces conveyer 30, and a further rapidly moving conveyer 185 feeds them to the seamer mechanism. Ends are stored in a magazine 56, rotating helically-bladed knives disposed on either side separating the lowest end from the pile at each revolution, the end then being moved forward by reciprocating bars 62 driven from a shaft 65 through links 64, 66, and carrying resilient fingers 98, 98<1> engaging the ends. A resilient bar 105 restrains forward movement and carries a head 110 preventing retrograde movement. In an intermediate position, in which the end is marked, stop fingers 102, 1021 engage the rear edge. The marking device comprises a lower stationary die 112, Fig. 10b, and an upper die 112<1> reciprocated through a slide 116, lever 120, and link 122 by mechanism driven from the main shaft of the machine The ends are fed forward to a guideway 130, Fig. 13, and are moved longitudinally by fingers 138 on a chain 132, preferably moving faster than conveyers 24, 27, the fingers also engaging can bodies C. The guides 130 merge gradually downwards into the guideway for the cans so that the forward edge of an end is introduced first, and the rear edge is gradually lowered, into a body. Arms 142, 1421, Fig. 12, contact the assembled can to position it correctly on the conveyer, and are moved to follow its outline by toggle levers controlled from a cam 151, Fig. 3, through a link 146. Movement of these arms also causes clinching rolls 155, 155<1> to follow the outline of the cans, links 163, 163<1> connecting the supporting levers 162, 1621 therefor to arms 149, 149<1>. The clinching rolls are driven through gearing 168, 171. An enclosing cover, the upper conveyers, &c. may be rotated about a shaft in the driving train, by a handle normally clamped to a pivoted arm on the framing, for inspection. The assembled cans are carried by an intermittently rotated conveyer 210 with fingers 220 successively beneath the first and second operation rotary seaming spindles. At the seaming positions, pads 217, 2171 are raised by cams first to bring stops 236 in front of the cans, and then to raise the cans to the seaming positions while stops 237 prevent rearward movement. A rod 275 is lowered to bring a pad 276 into engagement with the can. The seaming head comprises four rollers 263 carried on arms 260 at the lower end of spindles, on the upper end of which are arms 265 carrying followers 266 engaging an oval and tapered reciprocating cam 267, arms 265 being shorter than arms 260 to obviate sudden curves on the cam. The seaming rolls are returned by springs. The operation of the machine is controlled by a hand-lever 310 actuating a brake and clutch simultaneously. A clutch adapted to yield in the event of jamming is provided in the drive.