GB830585A - Improvements in devices for assembling folding boxes - Google Patents

Abstract

830,585. Making cartons. BALJAK CORPORATION. May 5, 1958, No. 14220/58. Class 18. Cartons are folded up from blanks A and their corners locked by means of a die supported on a framework 11 to a plunger 40 carried by a stem 41. A blank A is aligned with the die aperture by pins 38 and 39, the latter being threaded to engage the blank's edges, and is supported on the surfaces 34 and 25; when the plunger descends, the sides 54 are folded upwards by curved surfaces 23 of central blank folding elements 17. Hook elements 43 of the plunger are extended under spring pressure (not shown), thus bearing against the blank adjacent cuts 61 and opening them to permit subsequent entry of lock flaps 59 which are folded upwards by sloping top surfaces 26 of terrninal blank folding elements 18, 18<SP>1</SP>. The roller 48 secured between two pivotable arms 44 from which extend the hook elements 43 next enters a recessed cam track 20 in the central elements 17 and the hook elements 43 are caused to retract fully as the roller moves down the track, while side flaps 58 enter cutouts 36. The ends of the lock flaps 59 are then pulled to the inside of the carton by hooks 43 so that the edges 60 of the lock flaps engage with cuts 61 in the side wall and assembly is complete. Spring latches 63 (not shown) are provided at the lower ends of the central elements 17 to strip the carton from the plunger on its return stroke, grooves 70 being provided to accommodate them when projected.