Cross hammer dot printer

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact

Patent

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Details

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

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