Type character selecting mechanism for printing head
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United States of America Patent
Stats
-
Aug 18, 1981
Grant Date -
N/A
app pub date -
Oct 18, 1979
filing date -
Oct 20, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A type character selecting mechanism for use in a printing head which is equipped with a plurality of juxtaposed endless bands bearing type characters on their outer surfaces. The mechanism includes a plurality of juxtaposed selecting gears engageable with the corresponding endless bands for turning the same. Each of the selecting gears is formed on its inner side with a series of internal teeth. A selecting shaft is axially slidable through coaxial holes of the gears and is rotatable. The selecting shaft has a locking member at its inner end which is engageable with the internal teeth of one of the gears for locking the same in position. The type characters borne on the two outer bands are semi-fixed; the type characters borne on the remaining inner bands are changeable. The selecting gears for turning the outer bands have their internal teeth angularly displaced from internal teeth of the selecting gears for turning the remaining inner bands. Positioning means is provided for locking one of the inner gears so that the internal teeth thereof are aligned with those of one of the outer gears. Thus, the selecting shaft can be prevented from being erroneously moved between one of the outer gears and the adjacent one of the remaining gears.
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