Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1976-01-30
1977-08-30
Hartary, Joseph W.
Weighing scales
Self-positioning
Electrical current generating or modifying
177DIG6, 250237G, 356169, G01G 300, G01G 2336
Patent
active
040448479
ABSTRACT:
A weighing scale includes an optoelectronic system having apparatus for generating a moire fringe pattern and for detecting the moving of the pattern in accordance with scale tare deflection. One of a pair of ruled parallel grating sets is fixed with respect to the scale frame while the other is mounted for movement with the tare and close to and in a plane parallel with the fixed set. When a beam of light is projected through both grating sets in a transmissive mode towards a photodetector array the grating interference modulates the light beam into parallel moire fringes. Upon placement of a load on the scale, deflection of the tare results in movement of successive fringes across the photodetectors resulting in the sequential generation of weight indicative signals. The photodetectors are arrayed on and secured to a movable carrier which is adjustably positionable so that the effective spacings between the photodetectors corresponds to the spacings and proper phase angle required between said fringes.
REFERENCES:
patent: 3586665 (1971-06-01), Weyrauch
patent: 3815125 (1974-06-01), May
patent: 3867037 (1975-02-01), Litke
patent: 3923110 (1975-12-01), Dan
Hartary Joseph W.
Pitney-Bowes Inc.
Salzman Robert S.
Scribner Albert W.
Soltow, Jr. William D.
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