Impact printing apparatus with interchangeable rotary type wheel

Typewriting machines – Including type-set-assemblage mounted on carrier and... – Including type-faces movable relative to type-face-carrier

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Details

400171, 400175, 101 9319, B41J 130

Patent

active

044485557

ABSTRACT:
An impact printing apparatus automatically discriminates the kind of a type element mounted on a reciprocating carriage of the printer and interchangeable with another type element. A print control program is selected in conformity to the specific kind of type element while desired printing is carried out according to the selected program. Each of the interchangeable type elements is provided with a mark or marks or coded data to be detected by a sensor which is located in a predetermined position on a stationary part of the printer. The mark or coded data is sensed while the type element is rotated or while the carriage carrying the type element is moved. A single mark in the form of a slit is formed in a rotary hub of the type element, and the sensor for detecting the mark comprises a light emitting element mounted on the carriage and a light receiving element mounted on the stationary part of the printer which corresponds to the light emitting element. A plurality of marks in the form of magnetic pieces are arranged on the rotary hub, tongue or mark bracket of the type element, and the sensor comprises a magnetic sensor mounted on the stationary part of the printer.

REFERENCES:
patent: 3892303 (1975-07-01), Willcox
patent: 4026403 (1977-05-01), Inose et al.
patent: 4126400 (1978-11-01), Suzuki et al.
patent: 4209262 (1980-06-01), Savage
patent: 4281938 (1981-08-01), Phillips

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