With Means To Prevent Creep (e.g., Relative Movement) Between Record-media Patents (Class 400/506)
  • Patent number: 4297045
    Abstract: A paper feed system for a typewriter has its rear feed rollers formed to have minimum shingling and prevent treeing when a plurality of sheets of paper is fed between the platen and the rear feed rollers by rotation of the platen. Each of the rear feed rollers includes an annular outer portion, which is formed of an elastomeric material having a hardness of 30 to 35 Shore A durometer, supported on a hub, which is non-flexible so as to be relatively rigid, having a pair of flanges on opposite sides of the annular outer portion. Each of the annular outer portions has its thickness equal to or less than its width with the spacing between adjacent annular outer portions being greater than the width of each of the annular outer portions.
    Type: Grant
    Filed: September 21, 1979
    Date of Patent: October 27, 1981
    Assignee: International Business Machines Corporation
    Inventors: Robert L. Burton, Thomas P. Finan