Patent ID: 7735299

Claim:
An apparatus for forming an end closure structure of a tubular carton that travels in a flow direction along a carton conveyor path, the end closure structure being formed from at least a minor end flap and a major end flap, the apparatus comprising: a carton conveyor; a minor end flap retaining guide assembly for retaining the minor end flap in an inwardly folded position, the minor end flap retaining guide assembly comprising a longitudinally fixed minor end flap guide, having a proximal end and a downstream distal end, and a minor end flap unit positioned at the downstream distal end of the longitudinally fixed minor end flap guide and including retractable minor end flap guides; means for positioning the minor end flap guide, wherein the minor end flap guide can be positioned in at least a downstream position and an upstream position; a major end flap folding unit disposed adjacent to the retractable minor end flap guides.