Abstract: An impact line printer having a plurality of high velocity, small mass pivoted print hammers. Both a high print density and an unusually high impact printing force is achieved by actuating the hammers by a corresponding plurality of closely packed solenoids whose diameters are substantially larger than the spacing of the print hammers. These solenoids are mounted in the same vertical space but engage their associated print hammers a predetermined distances S.sub.1 and S.sub.2 from the hammer pivot axis. Appropriate selection of these distances S.sub.1 and S.sub.2 achieves uniform printing pressures from all of the hammers while using identical solenoids and identical drive currents. A paper engaging clamp includes a driven drive roller mounting a pair of resilient O-rings. A pair of pinch rollers, rotatably mounted on pivoted plastic lever arms, are adapted to clamp the paper or other printing medium between the rollers and the O-rings upon application of a force to the lever arms.