Abstract: A cylindrical segment having a longitudinal axis has a helical edge which serves as a static flap folding edge for a carton in translatory motion with respect to the cylindrical segment. The cylindrical segment is reciprocally rotatable about an axis such that when the cylindrical segment rotates the helical edge progressively engages and folds a flap of a carton disposed at the helical edge.

Abstract: A system for automatic inspection and ejection of cartons in a packaging machine includes detection elements (20, 22) for determining whether a carton (C) has assumed a predetermined configuration at a predetermined point in its path of travel. Carton ejection elements include rollers (30, 32) which are actuated to eject a carton (C) when the detection elements (20) determine that the carton has not assumed the predetermined configuration at the predetermined point in its path of travel. A synchronous relationship between a flow of cartons (C) and a flow of groups of articles (G) to be packaged is preserved at and as cartons leave the carton inspection and ejection station of a packaging machine.

Abstract: A method is disclosed for testing the integrity of a container of the type which includes a thin walled cup and a flexible lid sealed to the rim of the cup. In accordance with the method a force is applied to an elongated portion of the lid which circumscribes an area which is coaxial with the center of the cup. Since the cup is sealed this application of force causes the circumscribed area to bow outwardly from the cup. The displacement of the bowed portion is then compared to the previously measured displacement for containers known to be of acceptable quality. An apparatus for performing the test has an upper test assembly with a rim which is adapted to be urged against the elongated portion of the lid. A displacement sensor is mounted within the upper test assembly.