Apparatus for applying markers to webs of photographic material in copying machines

摘要

A copying machine, especially a projection printer, wherein a web of photographic paper receives images of successive film frames on an original at an exposure station and the original is monitored by a scanning device which transmits electric signals in response to detection of indicia denoting the last frames of successive orders. The web is formed with first markers which denote successive images thereon and the locations where the web is to be severed to yield discrete prints, and with second markers each of which denotes the last print of an order. A means for applying first and second markers of a first type includes an exposure unit, and a means for applying first and second markers of a second type includes a stamping unit with two punches. Both units are mounted on a carriage which is movable longitudinally and transversely of the web to thereby place the selected unit in an optimum position for the application of markers of the first and second type in dependency on the selected format of prints. The signals which are furnished by the scanning device are transmitted to a mechanical storage which transmits the signals with a variable delay to that device of the selected unit which applies second markers. The extent to which the storage delays the transmission of signals depends on the selected format of prints.