Typewriting machines – Including type-set-assemblage mounted on carrier and... – Imprint by movement of record-medium against type-face
Patent
1989-04-24
1990-07-31
Burr, Edgar S.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Imprint by movement of record-medium against type-face
4001573, 4003881, 400439, 400436, 101 9302, 101 9333, 101 9347, B41J 906, B41J 920
Patent
active
049446177
ABSTRACT:
An encoder having a special construction which includes a special tension spring which increases the life of the encoder. The tension spring has first and second "U"-shaped portions formed on one end thereof with the remaining end of the spring being secured to a frame of the encoder. The first "U"-shaped portion of the spring is positioned around a stud on a beam of the encoder, and the second "U"-shaped portion receives a portion of the beam. An actuator is used to move a hammer on the beam to an impact position, and the tension spring is used to return the beam to a home position. As the beam is moved toward the impact position, there is an increase in the area of contact between the stud and the first "U"-shaped portion to thereby minimize movement therebetween. When the spring returns to the home position, the body portion of the spring assumes an "arched" position which minimizes "bounce" of the beam in returning to the home position.
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patent: 794202 (1905-07-01), Tipton
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patent: 1872872 (1928-09-01), Bendix
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patent: 2625100 (1953-01-01), Williams et al.
patent: 4313682 (1982-02-01), Theilen
patent: 4522122 (1985-06-01), Mazumder
IBM Technical Disclosure Bulletin, vol. 24, No. 4, Sep. 1981.
IBM Technical Disclosure Bulletin, vol. 22, No. 12, May 1980.
Burr Edgar S.
Hawk Jr. Wilbert
Hilten John S.
NCR Corporation
Sessler Jr. Albert L.
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