For Shifting Platen Patents (Class 400/259)
  • Ribbon feed mechanism responsive to case shaft mechanism and printing mechanism
    Patent number: 4140407
    Abstract: A ribbon feed mechanism for a typewriter has a linkage for incrementally feeding a ribbon, a power roll rotated by a motor and a control member actuated by a printing mechanism for connecting the power roll to the linkage to incrementally feed the ribbon. The control member is also actuated by a carriage shift mechanism when shifting a carriage from an upper case position to a lower case position for connecting the power roll to the linkage to incrementally feed the ribbon.
    Type: Grant
    Filed: August 18, 1977
    Date of Patent: February 20, 1979
    Assignee: SCM Corporation
    Inventors: Richard F. Porterfield, Richard E. Shattuck