Vacuum head for film

摘要

An apparatus and method to position a moving continuous strip master and a moving continuous strip duplicate for copying film images from the master to the duplicate. A vacuum is applied to a housing, the walls of which are partially formed by surfaces of longitudinally extending adjacent rollers. The master and duplicate are inserted through adjacent roller pairs and both sides exposed to a vacuum within the housing. The master and duplicate are removed from the housing with confronting surfaces in contact through a third adjacent roller pair. As a result of the vacuum created between the confronting strip surfaces and atmospheric pressure on opposite strip surfaces the relative position of the master to the duplicate is maintained until exposure to a light source is complete.