| 摘要 |
773,097. Conical cup forming machines. CONTINENTAL CAN CO., Inc. March 4, 1955 No. 6435/55. Class 94(2). A machine for producing conical cups comprises a series of rotatable formers on a rotating head for carrying them past cup forming devices, the formers receiving a blank at one station and rotating to wrap it to conical form in passage to a second station where the longitudinal seam is sealed, an apex fold being formed at a third station and a beaded rim at a fourth. The mandrels rotate between all stations. Each blank B, Figs. 4, 1a, is fed into the machine with one edge engaged in a groove 50 in a mandrel 30 at station 1. The edge is gripped by fingers 54 within the mandrel and the mandrel moves to station 2 rotating to wind the blank held against it by a gravity operated presser shoe 146. At station 2, a heated spring-loaded shoe 174 seals the longitudinal seam. Between stations 2 and 3, the cup is pressed by a gravity shoe 148, and just prior to it reaching station 3, its unfolded apex is engaged by a spring-loaded arm 210, Figs. 4, 7, 13, to turn blank material over the apex. At station 3 a further heated spring-loaded shoe 174 engages the seam and a presser 216, mounted on a crosshead 232, Fig. 4, capable of reciprocating towards and away from the mandrels, presses additional blank material 412 over the apex fold, the arm 210 being pushed clear by its advance. Between stations 3 and 4, the cup is pressed by a further gravity shoe 150. At station 4, a member 268 mounted on the crosshead 232, presses a spring-loaded cone 272 over the cup, engages the apex in a heated mould 274 and forms a cylindrical portion 418 on the cup rim. Each mandrel has rotatable on it a rim spinning die 290 and at station 4 this is rotated by a friction wheel 352 and advanced towards the portion 418 along the mandrel axis to spin a bead 420, Figs. 7, 7a. During final spinning of the bead, the members 268 and 290 advance together towards the mandrel apex. The cup is ejected at station 5 by grippers 382 carried on the crosshead 232. The blank edge is released by the fingers 54 and the grippers 382 spring over the bead as they advance, and strip the cup from the mandrel as they withdraw. The final movement of the grippers springs the cup between rigid arms 402, Figs. 4, 7, at the mouth of a stacking shoot 390, the arms 402 retaining the cup when the grippers again advance. |
