| 摘要 |
<p>A serial impact printer (10) includes a platen (18) mounted for rotation upon a support frame, a print element having character imprinting portions disposed thereon, and a print element selector for moving the print element to position a selected character imprinting portion at a printing position. A high effective mass hammer (82), driven toward and away from the platen in a timed manner, drives each selected character imprinting portion for deforming the platen with a printing force. A carriage (32) mounted for reciprocating movement generally parallel to the platen, supports thereon the print element, the print element selector, the hammer and the hammer driver, and a stationary reaction bar (28) secured to the support frame is spaced from and extends parallel to the platen. The reaction bar includes a reaction surface against which the carriage is urged for developing the printing force as the hammer deforms the platen. <IMAGE></p> |
