US PATENT SUBCLASS 318 / 577
.~.~.~.~ Optical or photoelectric line followers

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
567  DF  .~ Program- or pattern-controlled systems {3}
575  DF  .~.~ Multiple axes analog systems {3}
576  DF  .~.~.~ Nonmechanical line, seam or edge followers {1}
577.~.~.~.~ Optical or photoelectric line followers

DEFINITION

Classification: 318/577

(under subclass 576) Subject matter in which the means to sense the line, seam or edge is a photoelectric means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

640, for photoelectric or optical measuring instruments as an error detector in a servo system.

SEE OR SEARCH CLASS

226, Advancing Material of Indeterminate Length,

20, for systems wherein the material advanced is maintained

in a predetermined path by photoelectric control. 250, Radiant Energy,

202, for photoelectric line followers wherein the novelty lies in the photoelectric portion of the circuit.