Latch mechanism for small-size printer

Printing – Selective or progressive – Bed and platen machines

Patent

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Details

101 9317, 101 9318, 400152, B41J 132

Patent

active

051137593

ABSTRACT:
A latch mechanism for a small-size printer capable of performing a printing operation with a desired type on a rotatable type drum being held at a print position by impacting a hammer towards the type drum across a recording paper loaded therebetween. The latch mechanism comprises a group of type drums composed of type drums of three digits each comprising a lock groove wheel for fixing one type drum selected among three drums at a print position by one type selection operation; a group of lock levers movable between its initial non-print position and its print position, which is disposed so as to correspond to each of the type drums, and constantly biased by a lock lever spring toward the lock groove wheel to lock the type drum in a print position; and a group of lock lever holding means capable of actuating the lock lever by being attracted by an electromagnet. Thus, since the lock groove wheel of each type drum has a predetermined alignment, it is possible to select on desired type drum from a plurality of type drums by one type selection operation. By a repetition of this type selection operation, the types of plural digits can be selected by a single electromagnet.

REFERENCES:
patent: 3455504 (1969-07-01), Beikufner
patent: 3874286 (1975-04-01), Ishikawa
patent: 3878779 (1975-04-01), Clary
patent: 3889593 (1975-06-01), McVey
patent: 3890894 (1975-06-01), Nihira
patent: 4328747 (1982-05-01), Fujiwara et al.
patent: 4380195 (1983-04-01), Hori et al.
patent: 4416557 (1983-11-01), Arai
patent: 4760785 (1988-08-01), Hori

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