Mass produced weight measuring system

Details Mass produced weight measuring system Mass produced weight measuring system

G - Physics

01

G

265/50

G01G 21/00 (2006.01) G01G 23/32 (2006.01)

Patent

CA 1104594

Abstract of the Disclosure A mass produced weight measuring system includes an op- tical transducer for determining the displacement of a scale load support structure with respect to a scale frame. To facilitate mass fabrication an optical transducer is produced and both gratings adjusted for alignment as a subassembly unit indepen- dent of the scale frame and load support structure; the clearance between the grating planes is set and the movable grating tempor- arily fixed. Nonlinearities in scale load support deflection inherent with the scale linkage and providing components other than true vertical deflection are compensated by adjustment of the gratings angle from a horizontal plane. During scale assembly, the scale frame and load support structure are placed in a main fixture, a transducer subassembly unit is selected, mounted to a subfixture and the grating planes referenced to scale assembly reference planes; then the transducer body is epoxy potted rela- tive to the frame and the movable grating potted relative to the load support structure. The movable grating is then freed for movement relative to the transducer body.

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