Wear Prevention for Print Hammers
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Wear of the faces of print hammers in back printers results from the slight relative motion of the paper caused by the type carrier during impact. Wear is prevented by a thin strip of material interposed between the hammers and the paper. As seen in the figure, a back printer comprises a continuous engraved metal type band 10 and plural print hammers 11 arranged in a row. The print medium located between the hammers 11 and band 10 comprises fabric ink ribbon 12 adjacent band 10 and paper 13 adjacent hammers 11. Printing occurs by hammers 11 impacting paper 13 and ribbon 12 against characters on type band 10 while band 10 is moving at constant velocity. The relatively high abrasive surface of paper 13 causes wearing of the faces of hammers 11 during impact.