Importance

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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.

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First Claim