Typewriter impact position adjustment mechanism

A printer for forming images upon a document sheet and including print line visibility enhancement means comprising:

• a print element having at least one type symbol thereon for traveling over a path a fixed distance and for impacting the sheet with the type symbol at a given angle of strike between the sheet and path of travel;
• a platen having a curved platen surface for retaining the sheet thereon while said sheet and platen surface are impacted by the type symbol, said curved platen surface having a center of curvature;
• a platen carrier means for maintaining the platen at a constant vertical position;
• a print element carrier means for maintaining the print element at a vertical position;
• print line visibility enhancement adjustment means connected to said print element carrier means for independently adjusting the relative vertical position of the print element with respect to the platen about an axis proximate to the center of curvature of the curved platen surface, to thereby maintain approximately the same distance of travel and angle of strike of said type symbol on said platen surface, said platen being maintained at said constant vertical position at least during said relative vertical position adjustment, said type symbol impacting said sheet and platen surface at different vertical positions of said sheet and platen surface depending upon the adjusted relative position.