| 摘要 |
Printing apparatus employing a pair of reciprocating print heads, one of which traverses the entire print field in a record mode while the other one moves in the opposite direction in an inoperative mode. The print heads are supported for movement on separate, spaced apart guide rails such that the pens thereof print along the same line relative to a moving recording web. To this end, structure is provided for causing movement of the non-printing pen out of the path of travel of the other pen as well as disengagement from the recording medium.
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