GB898364A - Improvements in or relating to apparatus for setting-up cartons - Google Patents

Abstract

898,364. Machines for erecting cartons. METAL BOX CO. Ltd. June 16, 1960 [June 30, 1959], No. 22476/59. Class 18. A carton, of the form shown in Fig. 2 having corner gussets secured by a synthetic resin thermoplastic adhesive, is erected in a die-andplunger type machine and has a conveyer which moves the blanks towards the die in a straight line path and has heating means positioned above the path. Further heaters may be incorporated in the die walls. Side panels 11-13 are secured to walls 2, 4, 5 by tongues and slits not shown. The adhesive may be a polyvinyl acetate resin incorporating plasticisers. The blanks are placed by hand, or delivered automatically from a magazine, on guides 15, 16 which may be adjusted for width by a screw and handwheel 19, 20 and stops engage the end of each blank. Top guides 23, 25 retain the blanks on the conveyer. Elements 26 on the conveyer 27 move the blanks towards the die-and-plunger. Radiant heaters 30 soften the adhesive and are arranged to be raised if the conveyer stops to prevent burning of the blanks. The heating elements 31 are retained in position by a solenoid controlled latch 39. When the main motor circuit is interrupted a solenoid 43 is energised and withdraws the latch and a spring 37 rotates a rod 35 moving the heaters upwardly away from the blanks. Two opposed walls 48, 49 of the die are moved by bell crank levers 52, 53 and cams 58, 59 to press together the adhesively coated carton walls; the walls may incorporate further heaters. The plunger is caused to dwell at the bottom of its stroke while the walls 48, 49 move inwards. When the plunger withdraws, an ejector plate 68 and stripper elements 75 separate the carton from the machine so that it is removed by a pusher type transfer device.