Typewriting machines – Including type-set-assemblage mounted on carrier and... – Including type-faces movable relative to type-face-carrier
Patent
1977-06-13
1979-01-16
Coven, Edward M.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Including type-faces movable relative to type-face-carrier
400 57, 101 9303, B41J 792
Patent
active
041346920
ABSTRACT:
A type wheel comprises a rotary hub, a plurality of resilient, circumferentially spaced arms extending radially outwardly from the hub and a plurality of type elements provided at the end portions of the respective arms. The type wheel is rotated until the selected type element reaches a printing position relative to a platen. One or more sheets of paper interspersed with carbon sheets are wound around the platen for printing. A lever is positioned to adjust the distance between the type wheel and the platen in accordance with the number of sheets. A printing hammer is electromagnetically actuated to resiliently move the selected arm so that the respective type element impacts against the paper through an inked ribbon to print the desired character. The length of time required for the hammer to clear the non-selected arms of the type wheel after impact is a function of the number of sheets of paper and thereby the position of the lever. An electrical circuit computes this length of time and inhibits rotation of the type wheel thereduring.
REFERENCES:
patent: 3707214 (1972-12-01), Ponzano
patent: 3858509 (1975-01-01), Grundherr
patent: 4030591 (1977-06-01), Martin et al.
patent: 4037208 (1977-07-01), Osterlund et al.
patent: 4058195 (1977-11-01), Fravel et al.
Mathews, IBM Tech. Discl. Bulletin, vol. 18, No. 11, Apr. 1976, pp. 3533-3534.
Fukushima Takashi
Suzuki Takami
Alexander David G.
Coven Edward M.
Ricoh Co. Ltd.
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