Accession Number : ADD011739

Title :   Dual Optical Mechanical Position Tracker.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Everett,S L , Jr

Report Date : 06 Jun 1985

Pagination or Media Count : 19

Abstract : This patent application describes an apparatus for retaining control of moving carriage impact dot matrix print heads when subjected to strong external forces such as shock and/or vibration. Position and direction of carriage movement is provided by a photo emitter-sensor assembly and a slotted timing wheel or disc having a plurality of equally spaced slots whose slot width is equal to the slot separation. The slot width is sufficient to frame a pair of side-by-side emitters which operate in conjunction with a pair of side-by-side sensors on the other side of the timing wheel. The order or sequence in which the sensors receive photo energy from their respective emitters indicates the direction of rotation of the timing wheel while simultaneous reception of photo energy by the side-by-side sensors provides an indication of valid rest position of the carriage drive motor. (Author).

Descriptors :   *PATENT APPLICATIONS, *PRINTERS(DATA PROCESSING), DETECTORS, DRIVES, ENERGY, IMPACT, MOTION, MOTORS, PHOTOGRAPHS, POSITION(LOCATION), REST, ROTATION, SEPARATION, SLOTS, TIME, VIBRATION, WHEELS, WIDTH, LOCKING(MECHANICS), OPTICAL DETECTORS

Subject Categories : Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE