Including Momentum Accumulator Patents (Class 400/387)
  • Patent number: 4668112
    Abstract: An improved serial impact printer designed to substantially reduce impact noise generation during the printing operation. The printer includes a print tip relatively movable with respect to a deformable platen, with a print element, a marking ribbon and an image receptor sheet interposed between the print tip and the platen which are urged together during a controlled contact period. Movement is subject to control by a kinetic drive mechanism which applies a first force for moving the print tip relative to the platen, prior to the initiation of the contact period, for closing the gap therebetween and then applies a second force for accelerating the print tip relative to the platen, subsequent to the initiation of the contact period, for causing the print tip to deform the platen.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: May 26, 1987
    Assignee: Xerox Corporation
    Inventors: Andrew Gabor, John C. Dunfield