| 摘要 |
A high speed serial printer for business machines preferably comprises a plurality of platens each for backing an associated record receiving medium, a continuous Mobius loop inking ribbon, a carriage movable relative to the platens, and a plurality of print heads mounted on the carriage, each print head having a set of selectively movable printing elements cooperable with the inking ribbon to impactingly print on the medium associated with one of the platens. The print heads are mounted back to back on the carriage in opposing spatial relationship, the print heads being offset with respect to each other and the carriage so that each print head impactingly engages the Mobius loop ribbon along each of two parallel printing paths thereon, in order to effect substantially even ribbon wear and best inking characteristics, regardless of the relative usage of the print heads. Also disclosed are a novel ribbon feed, and two-stage return deceleration of the spring-urged carriage toward its rest position.
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