Patent GB-436476-A (GB)
Title: Improvements in and relating to wrapping machines
IPC: B65B35/24
Filed: 1934-08-17
Abstract: 436,476. Wrapping-machines. AMERICAN MACHINE & FOUNDRY CO., 511, 5th Avenue, New York, U.S.A. Aug. 17, 1934, No. 23804. Convention date, Feb. 28. [Class 94 (i)] In a machine for folding and securing wrappers about packets, the mechanism for feeding the packets through the folding apparatus comprises a number of pivoted pusher arms carried by a conveyer chain, each arm having a roller coacting with a guide track which includes a section adapted to rotate at the proper time to retract the pusher arm from the partially wrapped packet. The packets A to be wrapped are fed through guides 30, 168 and are transferred into a vertical folding shoot 146, Figs. 5, 11, by an arm 170 supported by levers 171, 172 and reciprocated by a cam on the shaft 63. A stud 184 on the lever 171 engages a plate 185 integral with a sleeve 191 on the shaft 192 after each return stroke and is released only when a packet presses against a feeler plate 187 and so rocks the sleeve 191. The lever 172 carries a pin 195, Fig. 4, which on each return stroke strikes a lever 196 carrying at its other end a throw-out pin 200. If no packet arrives, the pin 200 remains in the path of the trip lever of a clutch 201 through which the shaft 59 is driven, thus stopping the shaft and the web-feed. If packets are not to be wrapped, the feeler plate 187 is swung aside, rendering the transfer arm 170 inoperative, and packets are fed through a guide 202. The main shaft 34 of the wrapping machine is driven from the packeting machine by a chain 32 and sprocket 33, which is arranged to be released from the shaft in the event of a jam by a clutch 47 controlled by a lever 35. The web W is fed from a reel R by a pulling roller 54 driven from the main shaft 34 to feed rollers 57, 58 and thence to a cutting bed 77, Fig. 4. The rollers 57, 58 are driven intermittently by a sprocket 108 loose on the shaft 59 of the roller 54 and in mesh with planet gears 110, 112 on an arm 70, these gears being driven by a sun gear 113 on the shaft 59. During the forward stroke of the arm 70, the feed rollers are driven, while during the return stroke they remain stationary and a loop pick-up roller 55 carried by the arm 70 takes the slack. The arm 70 is actuated by a crank 73 on a shaft 74 driven from the shaft 59. The web is severed by a bowed knife 126, Fig. 4, having attached to it a punch 127 which cuts a V-shaped notch in one end of the wrapper. At the same time, knives 82 having inclined edges cut nicks at the sides of the wrapper. The knives are carried by a shaft 84 and are actuated by a cam on the shaft 63. The web is fed over the folding shoot 146 between guides 137, 138, Fig. 5, and as soon as the wrapper B is cut off, the guide 138 moves inwardly in order to obtain correct positioning, while a plate 164 carried by a bracket 150 is withdrawn to uncover the shoot. The packets are moved in steps through the shoot by pusher arms 204 pivoted on chains 208 driven from the shaft 217. Each pusher arm carries a roller 221 which engages a guide track 223, Fig. 2a, to ensure vertical movement and prevent side-play. A packet is first pushed downwardly with the centred wrapper B, Fig. 11 between bottom side tuckers 233, Figs. 12, 13, while the wrapper is folded over the sides by a guide plate 135<1> and rear plates 165. At the rear of the tuckers 233 are wicks 236 so located as to apply adhesive to the sides T of the bottom tucks. The packet then passes through folders 240, 241, Fig. 16, which fold down the inner and outer side flaps, and the top flap F is pressed against a plate 228 carrying adhesive. Adhesive is also applied through slots in the folders 240 to the folded inner side flaps. The wrapper is thus sealed at the bottom and at the sides. The packet is fed into a horizontal guide comprising side plates 274, Fig. 18, and a bottom plate 275, whereupon the roller 221 of the pusher arm 204 engages a track section 278, Fig. 2a, which while the conveyer chain is stationary, turns through 180‹ to retract the pusher arm from the packet. The pusher arm is subsequently returned to its original position by a second revolving section 279. The track sections 278, 279 are rotated intermittently through a Geneva gear 286 by a cam on the shaft 289. Pivoted top tuckers 299, operate, adhesive from a wick 309 being first applied to the sides E of the tucks near the upstanding outer top flaps F and to the bottoms S of the tucks. The inner top flap U, Fig. 20, is folded down by a member 314 which also applies adhesive to it from a wick 321. The outer top flap F is folded down as the packet is pushed past a vertically oscillated arm 324, Fig, 22, by a reciprocating pusher 333, Fig. 10, which advances the series of wrapped packets between side heater plates 344 and under a top heater plate 345. The side heaters are carried by levers 349 and the top heater by a lever 354, and are swung away from the packets at each forward stroke of the pusher 333. The packets enter a delivery channel 358, 359 and are ejected in pairs through a lateral guide 366 by a pusher 369 which is released when a feeler plate 384 is engaged by the first of a series of packets and ejects the foremost pair. If delivery in a double row is not desired, the feeler plate 384 is swung aside, and the packets are fed directly to a table. If the machine stops due to the operation of the lever 35, the swinging of a segment 400 causes the heater plates to be moved put of contact with the packets.