Typewriting machines – Including type-set-assemblage mounted on carrier and... – Imprint by pivoting of type-head-carrier and type-head...
Patent
1987-08-26
1989-03-07
Pieprz, William
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Imprint by pivoting of type-head-carrier and type-head...
335265, 101 9322, 192 84AA, 400155, B41J 776
Patent
active
048101150
ABSTRACT:
A character selecting mechanism for a printer having a plurality of type wheel units arranged axially on a shaft. The character selecting mechanism comprises a plurality of electromagnetic clutches each having a solenoid, a sleeve rotatably received in the center hole of the solenoid and rotated continuously during a printing cycle, and a pair of selector plates resiliently pressed against the opposite end surfaces of the sleeve, respectively, so as to be attracted to the sleeve and to be turned by the sleeve when the solenoid is energized, having tongues facing opposite to each other to form part of a magnetic path for the magnetic lines of force of the solenoid with a small gap therebetween and in contact with each other through a small contact area. Each electromagnetic clutch controls a pair of type wheel units to stop the respective type wheels of the pair of type wheel units individually to position the selected characters of the type wheels at the printing position. Small projections are formed either in one of the opposite surfaces of the tongues or in both the opposite surfaces of the tongues so that the tongues are in contact with each other through a small contact area so that the selector plates are able to be turned individually.
REFERENCES:
patent: 2224254 (1940-12-01), Cotal
patent: 2510880 (1950-06-01), Fredrikson
patent: 2888532 (1959-05-01), Braumann
patent: 2946875 (1960-07-01), Waldhaner, Jr.
patent: 3204057 (1965-08-01), Magida
patent: 4706562 (1987-11-01), Hori
Alps Electric Co. ,Ltd.
Ogonowsky Brian D.
Pieprz William
Shoup Guy W.
Winters Paul J.
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