Method of manufacturing self developing photographic film units

Abstract

Abstract Method of manufacturing a succession photographic film units each comprising rectangular photosensitive and second sheets secured in face-to-face relation by a combination mask and binding sheet formed with a rectangular exposure opening, secured to the outer surface of the second sheet and having marginal portions folded around the end and lateral margins of the photosensitive and second sheets and adhered to the lateral and at least one end margin of the photosensitive sheet. The film unit also includes a rupturable container of processing liquid mounted adjacent the trailing edge of the photosensitive sheet and having portions defining a liquid discharge passage coupled with the photosensitive and second sheets so as to direct the liquid contents of the container therebetween; and a trapping element secured between the trailing end marginal portion of the binding sheet and the trailing end portions of the photosensitive and second sheets for collecting and retaining excess processing liquid overrun. During the assembly process, the binding sheet is in the form of an elongate strip which functions as a carrier on which the other components of a succession of film units are mounted as the carrier is moved between and through a succession of work stations at which assembly operations are performed and the components of each film unit are checked for proper assembly. The binding sheet carries the succession of film units through substantially all assembly and inspection steps except for the last two assembly steps in which the lateral edge portions of the binding sheet-which extend transversely of the carrier strip-are folded and adhered to the photosensitive sheet.

Inventors

• 👤 L Bruneau

Bibliographic Details