Original Publication Date: 1980-Sep-01
Included in the Prior Art Database: 2005-Feb-13
Paper 2, ribbon 3 and revolving type belt 4 are arranged between platen 1 and a row of print hammers (not shown). The rear side of platen 1 is kept in permanent contact with guide face 6 by the tension of spring 5. The two ends of platen 1 are provided with one bore each which is engaged by crankpins 7a of the two cranks 7. The length A of crank 7 is to be chosen in such a manner that the stroke does not correspond to a multiple of the character pitch in the print line. Shafts 8 of cranks 7 support timing gears 9 connected to each other by timing belts 10, so that there is no phase shifting between the positions of cranks 7, and platen 1 performs a circular shift. One of the two crankshafts 8 is continuously driven by geared motor 11 or intermittently by means of a stepper motor and a stepper gear.