Back to results
US 7,419,077 B2Granted
Film transport
OwnerRoger Constantine Fieldinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerRoger Constantine Fieldinventor
Estimating the term…
A device for transporting film (5), in particular unperforated film (5) without slippage, in particular intermittently, powered by at least one electric motor (8), having at least one element such as a needle point (2) mechanically engage film (5) by entering it and transporting film (5) from a start position to a stop position. An element such as a pressure plate (7) may be used in one embodiment to hold the film steady during exposure and a movable element (7) may act on the film to hold it during exposure. At least one mark may be exposed on film (5) to aid in picture registration. At least one roller (31) controls the length of loops of film (5) before and after the aperture. The roller (31) may transport the film (5) by friction, or, in another embodiment the roller (31) may have radially mounted needles (2) which penetrate film (5) to hold film (5) while transporting it. Provision may be made to protect the device in the event of a jam of polyester-base film (5) which is difficult to tear, by causing unit (12) holding needle (2) or needles (2) transporting film (5) to swivel, in one embodiment, to disengage needle (2) or needles (2) from film (5) and automatically switch off electric motor (8).
A device for transporting photographic film intermittently for motion pictures, said device being driven by at least one electric motor, and having a shutter for exposing said film to light through an aperture in a film gate when said film is at a standstill position, the improvement comprising means for transporting said motion picture film (5) without perforations from a defined start position to a defined stop position by discreetly piercing at least one surface of said film (5) with at least one mechanical point (2), so that said film (5) may be transported without slippage without the use of perforations, said at least one point (2) being inserted into said film (5) to hold said film (5) in order to transport said film (5) from said start position to said stop position, said at least one point (2) being withdrawn from said film (5) at said stop position before being brought to said start position and engaging said film (5) again to transport said film (5).
Dependencies are inferred from the claim text.