Cinematograph projectors
AssigneeWestrex Company Limited
InventorsLeroy Gordon Osborn, George Hunnam Brownlee
Life of this patent
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Abstract
A composite projector gate, aperture and light dowser assembly for a cinematograph film projector. The film guide surface through the gate area is curved convex towards the light source, film being held to curved marginal guides by flexible bands anchored before the gate, in the direction of film motion. A quick-release anchor is provided to retain the tension springs. The projection aperture comprises a removable plate in front of which, towards the light source, are spaced-apart heat screens with a horizontally-moving light-dowser blade therebetween in a space in which is provided forced air ventilation.
Claims9
Cinematographic film projection apparatus at each side of a projection aperture including a projection gate having film marginal support surfaces convexly curved toward a light source, comprising in combination:
- a. a plurality of flexible bands, at least one band extending respectively over each of said marginal support surfaces and pressure biased toward said marginal support surfaces whereby film passing between said flexible band and said film marginal support surfaces is pressed onto the said support surfaces;
- b. means feeding film to said aperture at a first side thereof, and taking up said film at a second side thereof;
- and
- c. each of said flexible bands positioned anchored on said first aperture side, and tensioned on said second aperture side.
Dependencies are inferred from the claim text.