Douglass C Harvey

US Patent:

44326254, Feb 21, 1984

Filed:

Dec 31, 1981

Appl. No.:

6/336135

Inventors:

Douglass C. Harvey - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03B 1726

US Classification:

354275

Abstract:

In a film cartridge employing roll film with a backing strip, film flatness is improved by means of two innovations which are employed either individually or in combination, depending on the specific type of film cartridge involved. First, to prevent the relative slippage between the paper and the backing strip, resulting from "clock springing" of the film supply roll, the trailing end of the film is attached to the backing strip. Second, the film and backing strip assembly is provided initially with sufficient extra backing strip in the film take-up chamber to guarantee that there will always be a surplus of backing strip in that chamber so that only the film will be tensioned by the rotation of the take-up roll.