Carton erecting apparatus

Claim 1

Carton erecting apparatus comprising a forming die including four corner posts and radiused carton formers located between the corner posts with the upper surfaces of the corner posts and the carton formers located in a common plane, a reciprocable punch operable to press into the die a blank lying in a flat condition on the top surfaces of the corner posts and carton formers, first elongate hollow members supported relative one to each of the corner posts to underlie edge portions of the underside of blank portions resting on the corner posts, and second elongate hollow members supported one adjacent each corner post to be at right angles to the first hollow member associated with the post and disposed above the plane of the upper surfaces of blank portions resting on the corner posts, said first and second elongate hollow members being connectable with a source of heated air and arranged simultaneaously to direct heated air on to elongate areas closely adjacent to edge portions of blank portions resting on the corner posts and which are to be sealed one to another when the blank is pressed into the die by the punch, said first elongate hollow members each being provided with perforations by which jets of heated air are directed on to said elongate areas on the underside of the blank and said second elongate hollow members each including a slot which extends lengthwise thereof and a sleeve the position of which is adjustable lengthwise and peripherally of the second elongate hollow member and which includes a slit which extends lengthwise of the sleeve and is of lesser width and length than that of said slot and through which a jet of heated air is directed on to an elongate area on the upperside of the blank.