Hall effect printwheel encoder

Details Hall effect printwheel encoder Hall effect printwheel encoder

G - Physics

07

B

340/135.6

G07B 17/02 (2006.01) G01D 5/14 (2006.01) G07B 17/00 (2006.01) H03M 1/24 (2006.01)

Patent

CA 1295709

HALL EFFECT PRINTWHEEL ENCODER ABSTRACT OF THE DISCLOSURE An encoder for a wheel comprises a linear Hall-effect sensor and magnet mounted on a non-ferrous metal shaft. A ferrous metal ring having a toothed structure extending inward such that each tooth ends at a point on a spiral curve is molded into the printwheel encircling the shaft. The Hall-effect senosr output provides a determined output when each tooth is positioned over the sensor to enable an absolute position determination while the signal drop off between the teeth as the wheel is moved allows for counting the steps between settings for relative encoding and redundancy.

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