Patent GB-985076-A (GB)
Title: Box forming machines
IPC: B31B3/46
Filed: 1964-02-21
Abstract: 985,076. Carton erecting machines. CONTINENTAL FOLDING PAPER BOX CO. Inc. Feb. 21, 1964 [Sept. 11, 1963], No. 7327/64. Heading B5D. In a machine for erecting a tray-like carton adhesive is applied to the bottom of the lowermost blank in a magazine which is subsequently removed by a conveyer moving in an arcuate and then horizontal path to bring the adhesive side uppermost and then a reciprocating mandrel erects the blank into carton form in a die with inwardly moving sides which press the adhesive coated end walls against tabs on front and back walls. Magazine.-In the illustrated embodiment, blanks are held in a magazine 48 (Fig. 2), with side ledges 50 by a pair of arms 64 pivoted at 44 and actuated by a control shaft 86 through crank 84 and link 78. The bars 64 are held against the magazine by a spring-loaded bolt 72 and drawn away by control shaft 86. Adhesive applying apparatus.-Situated on each side of bars 64 are bars 164 carrying adhesive heads 180 (Fig. 4) for application to the end walls of the blank. Bars 164 also rotate about shaft 44 and are actuated by control shaft 86 by means of a crank and link system shown. The adhesive heads 180 comprise a block 182 (Fig. 6), with channels 190 to a porous pad 196 covered with a metal plate 198 with windows. Blank removal on to conveyer system.-A pusher plate 122 (Fig. 2), mounted in grooves in guide plates 120 assists in pushing the lowermost blank from the magazine 48 on to the conveyer system. It is actuated by an arm 126 moving in a slot 124 due to movement of a shaft 128 connected by crank arms to control shaft 86. Movement of plate 122 is restricted by a screw 160 abutting a stop 162 spanning the ends of guide plates 120. The lowermost blank is removed from the magazine by engagement between a rubber wheel 60 and spring- mounted rollers 144. Crank links of arms 64, 164 and plate 122 with control shaft 86 ensure synchronism of adhesive application and blank removal from the magazine, the blank passes beneath rollers 216 coaxially mounted with roller 60 and thence over rollers 228 and is held thereon by an upper conveyer belt 254 situated midway between belts 226. The position of end pulleys 232, 262 may be adjusted by slides 236, the tension being suitably adjusted by tensioning pulleys 244, 266. Nip rollers 274 (Fig. 10, not shown), may be provided adjacent pulleys 232 for feeding the blank to the forming and pressing assembly (Figs. 12 and 13). Box erection assembly.-A blank is guided on shelves 278 between walls 280 into contact with abutments 282 (Fig. 13). The shelves 278, cut out at 366, are mounted on support plates 284 (Fig. 12), mounted on shafts 286 which are mounted on T-shaped members 288 (Fig. 15), for connection with tie rod 290. Tie rod 290 is in an uppermost position for receiving a blank from the conveyer and then moves downwardly after the mandrel 320 has pressed the blank between die rods 374 (Fig. 13) and blocks 368. Downward movement of tie rod 290 and hence support plates 284 presses wedges 312 (Fig. 12) against rollers 310 and causes inward pressing movement of blocks 368 to press tabs joined to back and front walls of the carton against the adhesive on the end walls. Mandrel 320 is mounted on plates 330, vertical movement thereof being effected by intermeshing of gear racks 340 on slides 332 with spur gears 344 connected by cranks to rack-and-pinion 356, 348 operated by tie rod 290. A stripper plate 394 (Fig. 13) 'with fingers 396 located within the mandrel 320 is guided for vertical reciprocation with respect to the mandrel on a slide 398 operated by a rack gear with clutch mechanism and a cam follower; a pin engaging in a fixed hook to ensure correct initial positioning of the stripper plate 394 in the mandrel 320. Synchronization of the cam follower actuating the stripper plate 394 with movement of the mandrel 320 and also the presser plates 368 is effected by a pin assembly 388 (Fig. 15) moving in partially overlapping slots 390, 392. The machine may be adapted for different sized blanks by simultaneous rotation of screw members 294 (Fig. 12) with oppositely threaded end portions on which axles 304 carrying rollers 310 are mounted, and support plates 284 are spring-biased against said rollers 310. The erected cartons are ejected on to guide tracks 464 and pushed from the machine by pushers 478 on a conveyer 470.