Abstract: An adjustable wrappage film feeding device includes a chassis having end plates rotatably supporting a driving shaft therebetween. The driving shaft is driven by a motor via a worm—worm gear transmission. Two first bevel gears are mounted on the driving shaft to be rotatable in unison with the driving shaft while being allowed to axially move with respect to the driving shaft. A screw rod is rotatably supported by the end plates and threadingly engages two movable carriages that are spaced from each other a distance. By rotating the screw rod, the carriages are driven toward/away from each other and thus changing the distance therebetween. Each carriage rotatably carries a roller adapted to drivingly engage and convey a film in a predetermined direction toward an article to be packaged. Each roller is coupled to a corresponding one of the first bevel gears by a second bevel gear that mates the corresponding first bevel gear.

Abstract: A cutting device is incorporated in a packaging machine having at least one expansion cylinder consisting of upper and lower sections with a gap therebetween. The cutting device includes a rotation ring concentrically surrounding and spaced from the expansion ring. The rotation ring is coupled to a driving system for concentric rotation with respect to the expansion cylinder. A number of cutting members are pivoted to the ring. Each cutting member includes a cutting blade and a weight on opposite sides of the pivot thereof. A spring is connected between the weight and the rotation ring for biasing the cutting blade to a stowed position where a sharp edge of the cutting blade is spaced from the gap. When the rotation ring is rotated at a high speed, a centrifugal force acts upon each weight thereby moving the cutting member against the spring toward a cutting position where the sharp edge of the cutting blade partially extends into the gap for cutting off a packaging material fit over the expansion cylinder.

Abstract: A cutting device is incorporated in a packaging machine having at least one expansion cylinder consisting of upper and lower sections with a gap therebetween. The cutting device includes two rails located on opposite sides of the expansion cylinder and substantially parallel to each other. Two slide blocks are respectively and movably mounted on the rails for movement along the rails between first and second positions on opposite sides of the expansion cylinder. A single cutting blade is arranged between and carried by the slide blocks whereby when the slide blocks are moved along the rails between the first and second positions, the blade is driven to reciprocally pass through the gap between the upper and lower sections of the expansion cylinder.

Abstract: An adjustable wrappage film feeding device includes a chassis having end plates rotatably supporting a driving shaft therebetween. The driving shaft is driven by a motor via a worm-worm gear transmission. Two first bevel gears are mounted on the driving shaft to be rotatable in unison with the driving shaft while being allowed to axially move with respect to the driving shaft. A screw rod is rotatably supported by the end plates and threadingly engages two movable carriages that are spaced from each other a distance. By rotating the screw rod, the carriages are driven toward/away from each other and thus changing the distance therebetween. Each carriage rotatably carries a roller adapted to drivingly engage and convey a film in a predetermined direction toward an article to be packaged. Each roller is coupled to a corresponding one of the first bevel gears by a second bevel gear that mates the corresponding first bevel gear.