| 摘要 |
A system is provided for a step optical printer to detect an out-of-frame condition in the printer projector and/or camera sections. The out-of-frame detector comprises a free wheeling encoder driven by film entering a gate of the printer and a second encoder driven by the printer drive mechanism. A comparator is connected to the outputs of the encoders to detect a lack of correspondence between the length of film entering the gate and the length of film being driven. Such lack of correspondence being indicative of an out-of-frame condition.
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