Printwheel and encoder assembly

Details Printwheel and encoder assembly Printwheel and encoder assembly

1987-12-21

1990-01-09

Shoop, Jr., William M.

Coded data generation or conversion

Digital pattern reading type converter

Magnetic, inductive or capacitive

341133, 341171, 310DIG3, 364900, 36491852, H03M 122

Patent

active

048931217

ABSTRACT:
A printwheel encoder comprises a non-ferrous shaft having a magnet strip and a flexible Hall-effect sensor arrangement affixed thereon. Molded printwheels including a flux conducting ring having an inner spiral surface are rotatably mounted on the shaft in respective juxtaposition to each Hall-effect sensor. The wheels are mounted adjacent to each other so that the rings form a nearly continuous flux conducting sheath which protects the Hall-effect sensors from external magnetic fields.

REFERENCES:
patent: 3112464 (1963-11-01), Ratajski et al.
patent: 3939372 (1976-02-01), Wurst et al.
patent: 4168533 (1979-09-01), Schwartz
patent: 4427969 (1984-01-01), Coppola et al.

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