Mobil Oil Corporation

J S Jones

Donald F Huffhines

Clarence G Smith

An apparatus for plotting information, e.g., seismic data, onto a continuous sheet of a recording medium, e.g., photographic film. The film travels from a supply reel, over an advance roller, across a flat exposure surface, and onto a takeup roller. Torque motors apply equal but opposite torques to the supply reel and the takeup reel to maintain the film in tension to insure that the film will lie flat on the exposure surface during the plotting operation. A stepping motor rotates advance roller to move the film a precise amount across the exposure surface at desired times during the plotting operation. A camera, e.g., cathode ray tube, which receives data and projects it onto the film on the exposure surface, is mounted on a carriage which is swept back and forth across the exposure surface by means of a lead screw driven by a precision stepping motor. Control circuitry means is provided which not only drives the stepping motor and, hence, the carriage at a constant, defined speed during the plotting portion of a sweep but also provides for the proper acceleration and deceleration of the motor during each sweep of the carriage.

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Valley View, TX, United States of America

J S Jones