Abstract: A flow camera equipped with a microprocessor based control system accepts large original documents in continuous, moving fashion and photographs them through a specifically shaped slotted aperture positioned between the original document and an objective lens. The originals are illuminated during exposure simultaneously from the front and the back, recording congruent images from two-sided material such as engineering drawings on translucent media having positionally related information on both sides. The light from the underneath side, opposite the lens, not only reveals and exposes the image on the second side but it enhances the quality and sharpness of the primary image on the side toward the lens. Avoidance of image loss is accomplished by using in the optical system a single mirror which deflects the optical path substantially less than 90.degree..

Abstract: An auxiliary camera/projector is mounted on one side of an automatic step-and-repeat camera to obtain a template film image and project it onto the subject holder to provide a visual guide for properly positioning copy which is to be photographed by the step-and-repeat camera. The auxiliary unit has a film holder which latches into place and which includes removable opaque panels in front of and behind the film. When the camera/projector is being used to photograph the template, the front panel is removed for exposure of the film to the template image. After the exposed film has been processed, the film holder is replaced in the camera/projector and both opaque panels are removed for projection of light through the film and onto the subject holder.

Abstract: A boxlight which serves as a source of light projected through a film transparency and focused on a photosensitive film in order to project the image on the transparency onto the film. The boxlight has an improved light source formed by pulsed xenon lamps arranged end to end to approximate a circle centered on the optical axis of the photoreproduction machine and contained in a plane perpendicular to the optical axis. Reflectors are provided in a circular arrangement extending around the light source circle and include reflective panels oriented at about 15.degree. to the optical axis. The circular configuration of the light counters cosine fourth losses and makes the light intensity pattern more uniform at the film plane.

Abstract: A three point suspension system and clamping mechanism for holding the face of a chase perpendicular to the optical axis of a multiple imaging camera/projector. The chase is equipped with pins which project from it and are located to bear against three pegs which project from the chase carrier of the machine to provide three point contact between the chase and chase carrier. The tips of the pins are adjusted to define a plane that is parallel to the plane of the glass panel on the chase which receives the flat copy to be photoreproduced. The ends of the pegs lie in a common plane which is perpendicular to the optical axis so that the glass panel of the chase is also maintained normal to the optical axis. The clamping mechanism is operated by pneumatic cylinders and allows the chase to be quickly replaced or rotated to a different orientation.