Film tensioning device
AssigneeChristie Electric Corp.
InventorRichard P. Eddy
Life of this patent
Estimating the term…
Abstract
A film tensioning device for maintaining tension in the film in a film transport system such as a motion picture projector. A tension roller mounted between pressure rollers with the film running over the tension roller, with a spring urging the pressure rollers against the film to prevent slippage of the film on the tension roller. A curved spring carried within the tension roller and engageable with a stop providing sliding friction with the tension roller. The spring is readily removable for substitution of a different spring to provide a different magnitude of tension in the device.
Claims10
In a film tensioning device for maintaining tension in the film in a film transport system, the combination of:
- a base;
- a tension roller having a periphery for receiving film;
- pressure roller means;
- means for mounting said tension roller and said pressure roller means on said base with said pressure roller means adjacent said tension roller for urging film against said tension roller periphery;
- a stop mounted on said base;
- and
- a tension member carried in said tension roller in slidable relation, and engageable with said stop on rotation of said tension roller, independently of the speed of rotation of said tension roller.
In a film tensioning device for maintaining tension in the film in a film transport system, the combination of:
- a base;
- a tension roller having a periphery for receiving film;
- pressure roller means;
- means for mounting said tension roller and said pressure roller means on said base with said pressure roller means adjacent said tension roller for urging film against said tension roller periphery;
- a stop mounted on said base;
- and
- a tension member carried in said tension roller in slidable relation, and engageable with said stop on rotation of said tension roller, said tension member including a spring member providing a friction engagement between said tension member and said tension roller.
Dependencies are inferred from the claim text.