The print head is mounted on a carriage which, in turn, rides on a round bar which is transversely adjustable towards and away from the parallel running platen. The round bar rolls in horizontal oblong slots in side walls of the frame and has short, drum-shaped cams eccentrically connected to its ends, the cams being coaxial to each other and are held individually in abutment with reference surfaces that are individually adjustable on these side walls towards true parallelism; an adjusting lever is affixed to a third cam on the bar, and is coaxial to the two other cams, which lever is latchable in positions to thereby hold adjusted distances of the print head from the platen.
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