Apparatus for the production of duplicate, and other films from original films

摘要

Apparatus for the production of duplicate micro and other film from an original film in which the duplicate film of considerably greater length than the original film is housed on a spool in a light tight magazine and fed therefrom through a light trapped slot, the duplicate film and the original film being fed together over a transparent cylinder in a lamp house, an opaque slotted cylindrical sleeve surrounded by the cylinder and a lamp within the sleeve. The films are held in contact with the cylinder by an endless belt driven synchronously with the take up spools for the films, a sensing finger being mounted to engage the original film as it is taken up by the delivery spool to stop the apparatus a predetermined interval after the last image on the film. The duplicate film in the magazine operates a meter to register the length of film remaining on the spool in the magazine. The provision of the magazine gives a considerable saving in duplicate film as the film is severed as soon as the images on the original film stop irrespective of whether the whole length of original film contains exposure.