Package making – Apparatus for contraction of cover by stretching or shrinking
Patent
1992-09-25
1994-04-12
Sipos, John
Package making
Apparatus for contraction of cover by stretching or shrinking
53588, 53587, B65B 1104
Patent
active
053014936
ABSTRACT:
A steplessly adjustable pre-stretched film wrapping apparatus comprises a downstream film roller and an upstream film roller connected therebetween with an adjustable power transmission system to unwind and stretch a film web from a film roll. The power transmission system comprises a motor generating a rotational motion to drive a main shaft. A pair of mating bevel gears are used to transmit the rotation to the downstream film roller and a disk member which is secured on the upstream film roller and is driven by the main shaft via an active roller coaxially rotatable with the main shaft and an idle roller interposed between the active roller and the disk member to rotate the upstream film roller. The idle roller is contactingly rolling on a side of the disk member to be rotatably in an orthogonal way and thus defining a distance from the center of the disk member which determines the speed ratio therebetween. A linear motion actuation motor is provided to move the idle roller on the disk member to change the distance from the disk member center so as to adjust the speed ratio. Two idle rollers are respectively disposed between the upstream film roller and the film roll and the downstream film roller and a load to be wrapped to maintain the angular relationship of the film around the film rollers constant.
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