Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1982-06-22
1984-07-31
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9304, 400657, B41J 302
Patent
active
044627050
ABSTRACT:
A print head travelled lengthwise with respect to a cylindrical rotary drum provided on its outer periphery with a plurality of ridges extending parallel to the axis has two or more print hammers electromagnetically driven. The print hammers are arranged parallel to one another at a distance corresponding to a horizontal pitch of a dot matrix and are changeably driven with intervals which the corresponding ridge of the drum requires to move a vertical pitch of the dot matrix. Further, in order to avoid a bad influence of a nonuniformity of rotation of the drum to the printing quality, the print hammers have a plurality of bumps for forming dots on the respective striking surfaces and each of the ridges has a periphery surface of a width greater than a thickness of the print hammer.
REFERENCES:
patent: 3387081 (1968-06-01), Kleinschmidt
patent: 3768403 (1973-10-01), Rose
patent: 3804008 (1974-04-01), Hoyer
Hayashi Mikio
Mizutani Seiki
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Seikosha Co. Ltd.
Sewell Paul T.
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