Film advance mechanism
AssigneeBishopbarn Limited
InventorKenneth W. Franklin
Life of this patent
Estimating the term…
Abstract
A film advance mechanism is used for advancing a tubular film along a film support with the film surrounding the support. The mechanism comprises two drive units each comprising a drive belt passing round two rollers mounted on a respective drive belt carrier and arranged so that a straight run of the belt can engage frictionally against the film to drive the film along the support. Each carrier is supported for movement towards and away from the film support and for angular movement with respect to the film support and is urged towards the film support such that it aligns itself with the film support due to engagement therewith.
Claims7
A film advance mechanism for advancing a tubular film along a film support with the film surrounding the support, the mechanism comprising two drive units;
- each drive unit comprising a drive belt carrier, two rollers mounted rotatably with respect to the drive belt carrier and a drive belt arranged so that a straight run of the belt can engage frictionally against the film to drive the film along the support;
- drive means for rotatingly driving at least one of said rollers of each drive unit;
- support means for each drive belt carrier such that each carrier is supported for movement towards and away from the film support, said support means further allowing for variable angular movement between the straight run of the belt and the film support;
- and bias means for urging each carrier towards the film support such that each carrier aligns itself with the film support due to engagement therewith.
A film advance mechanism for advancing a tubular film along a film support with the film surrounding the support, the mechanism comprising two drive units;
- each drive unit comprising a drive belt carrier, two rollers mounted rotatably with respect to the drive belt carrier and a drive belt arranged so that a straight run of the belt can engage frictionally against the film to drive the film along the support;
- drive means for rotatingly driving at least one of said rollers of each drive unit;
- support means for each drive belt carrier such that each carrier is supported for movement towards and away from the film support, said support means further allowing for variable angular movement between the straight run of the belt and the film support;
- and bias means for urging each carrier towards the film support such that each carrier aligns itself with the film support due to engagement therewith;
- each support means comprising a swinging arm and one end of each drive belt carrier being pivotally mounted on a respective swinging arm providing said angular movement with respect to the film support.
Dependencies are inferred from the claim text.