Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1991-07-23
1993-06-15
Burr, Edgar S.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9304, B41J 2245
Patent
active
052192350
ABSTRACT:
A printing hammer assembly is provided having a plurality of hammer springs arrayed side by side at a predetermined pitch in a shuttling direction of a hammer bank. A front yoke is provided in front of the hammer springs, and a plurality of rectangular grooves are formed at an upper portion of the front yoke so as to receive therein corresponding rectangular plungers provided at the hammer springs. A gap is defined between a side wall of the groove and a side wall of the plunger. The gap is sufficiently large for tolerating inaccurate assembly of the hammer springs and the front yokes. Further, a subordinate front yoke is provided on the front yoke at a position of an array of the grooves.
REFERENCES:
patent: 4502382 (1985-03-01), Kunita et al.
patent: 4625638 (1986-12-01), Fritz et al.
patent: 4879947 (1989-11-01), Kurosawa et al.
Hiki Toshio
Matsumoto Yoshikane
Sakamoto Shin'ichi
Suematsu Shigenori
Burr Edgar S.
Hilten John S.
Hitachi Koki Co,. Ltd.
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