Patent ID: 7231748

Claim:
An adjusting device adapted to be arranged in a film packaging machine, the adjusting device comprising: a moving mechanism mounted to the film packaging machine, the moving mechanism being adjustable to accommodate film expansion members of different size in the film packaging machine; two support blocks mechanically coupled to and driven by the moving mechanism to move in opposite directions; a plurality of toothed wheels each rotatably mounted to a surface of one of the support blocks to be movable in unison therewith, at least two film drive rollers for driving film along the film expansion member, the film drive rollers being coupled at one side of the support blocks to at least two shafts extending from selected ones of the toothed wheels disposed at an opposing side of the support blocks; two fixed toothed wheels rotatably supported on the film packaging machine to be rotatable substantially in coplanar manner relative to the toothed wheels on the support blocks; a shared timing belt extending endlessly about and matingly engaging each of the toothed wheels on the support blocks and each of the fixed toothed wheels, wherein the timing belt includes dual toothed surfaces on opposing sides thereof engageable with the toothed wheels; and a motor mechanically coupled to one of the fixed toothed wheels whereby torque/rotation induced by the motor is transmitted through the timing belt and the toothed wheels to the shafts.