Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1992-12-08
1994-08-09
Burr, Edgard S.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
40012423, 101 9304, 101 9348, B41J 2245
Patent
active
053359992
ABSTRACT:
The specification sets forth a hammerspring for a dot matrix printer having a plurality of such hammersprings spaced along a hammerbank with permanent magnetics to draw said hammersprings into a retracted and uniformly stressed mode through a spring portion which are released by overcoming the magnetic retention, the hammerspring formed with a base portion connected to the hammerbank with a spring portion extending from said base portion having a decreasing transverse cross sectional area extending to an enlarged end portion for improved magnetic retention against said permanent magnets.
REFERENCES:
patent: 4233894 (1980-11-01), Barrus et al.
patent: 4423675 (1984-01-01), Luo et al.
patent: 4461207 (1984-07-01), Helinkski
patent: 4610553 (1986-09-01), Yasunaga et al.
patent: 4777875 (1988-10-01), Fujiwara et al.
patent: 4790674 (1988-12-01), Kleist et al.
Chon James Y.
Farb Norman E.
Bethel George F.
Bethel Patience K.
Burr Edgard S.
Hilten John S.
Printronix, Inc.
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