Document filming camera
AssigneeMinnesota Mining and Manufacturing Company
InventorJohn A. Herrmann
Life of this patent
Estimating the term…
Abstract
A document filming camera for placing successive images of documents or the image of a continuous document on a strip of film and for adding recording marks along the edge of the film indicating the position of the frame on the film exposed to a document and for placing marks at intervals along the film when filming a continuous fan-fold document, as produced by a computer, to indicate the location of each successive page of the document.
Claims13
A continuous document-handling attachment for a document microfilm camera having a document feed roll, means for projecting images of the document as it moves past a photographic station on the document feed roll to a focal plane, means for advancing a film synchronously with the movement of the document feed roll, and an indexing mark exposure device for exposing a frame mark on the film as each document is filmed, said attachment comprising
- a support for supporting a document to be photographed,
- at least one wheel supported by a rotatable shaft to be driven from a said document to rotate said shaft,
- document sensor means to produce electrical pulses as said wheel is rotated to indicate incremental movement of the document,
- first counter means responsive to a predetermined number of pulses from said document sensor means for energizing said exposure device,
- feed roll sensor means for generating pulses upon rotation of said feed roll through given increments, and
- second counter means for counting said generated pulses from said feed roll sensor means, said second counter means being connected to said document sensor means and being reset to 0 when a pulse is generated from said document sensor means and said second counter means pulsing said first counter means when pulses are not produced by said document sensor means.
A continuous document-handling attachement for a document microfilm camera having a document feed roll, means for projecting images of the document as it moves past a photographing statin on the document feed roll to a focal plane, means for advancing a film synchronously with the movement of the document feed roll, and an indexing mark exposure device including a timed indexing mark generator circuit for exposing an indexing mark on the film as each document is filmed, said attachment comprising:
- switch means having a position which it assumes it response to the presence of a document at said switch means;
- a document length selector;
- a document length encoder-decoder operatively connected to said document length selector, said encoder-decoder providing a first signal in response to said encoder-decoder circuit receiving a predetermined number of pulses when said encoder-decoder is set in accordance with the setting of said selector;
- circuit means operatively connected to said switch means, said time indexing mark generator circuit, and to said document length encoder-decoder for providing a second signal to said timed indexing mark generator circuit for initiating its operation, said circuit means providing said second signal in response to movement of said switch means to said position and providing said second signal in response to said first signal when provided by said encoder-decoder circuit;
- gating signal circuit means connected to said circuit means and said encoder-decoder for providing a single gating signal to said encoder-decoder in response to said second signal provided by said circuit means for resetting said encoder-decoder in accordance with the setting of said selector;
- and
- pulse generating means operatively connected to said encoder-decoder and operative in response to movement of a said document for providing pulses to said encoder-decoder.
Dependencies are inferred from the claim text.