US PATENT SUBCLASS 400 / 636
.~.~ By roller couple (e.g., rotatable pinch rollers, etc.)

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

578  DF  SHEET OR WEB (E.G., RECORD-MEDIUM FEEDING MECHANISM) {13}
634  DF  .~ Including friction-feed means (e.g., band) {2}
636.~.~ By roller couple (e.g., rotatable pinch rollers, etc.) {8}
636.1  DF  .~.~.~> With typewriter-actuated control of feed-roller position
636.2  DF  .~.~.~> Including intermediate drive means (e.g., gears) connecting feed-roller to platen
636.3  DF  .~.~.~> Including feed-roller having equalizing or pressure-adjusting means
637  DF  .~.~.~> Including lower feed-roller(s) (e.g., pressure roller, etc.) {4}
638  DF  .~.~.~> Including feed or pressure roller mounted on "paper-finger"
639  DF  .~.~.~> Including upper feed-roller(s) (e.g, pressure roller, etc.) {1}
640  DF  .~.~.~> With cooperating scale
641  DF  .~.~.~> Feed-roller structure or brake or spacer therefor

DEFINITION

Classification: 400/636

By roller couple (e.g. rotatable pinch rollers, etc.):

(under subclass 634) Subject matter wherein at least one member contacts one surface of the record-medium* and at least another member contacts the opposite surface of the record-medium, and wherein each member is a cylinder or a cylindroid rotatable in opposite rotational directions with the record-medium therebetween.

(1) Note. In this subclass a roller couple comprises two counter-rotating rollers with record-medium therebetween, neither of which rollers is a platen*. In the subclasses indented hereunder, the platen is cylindrical or cylindroidal and is rotatable to feed record-medium frictionally engaged thereby, and the other roller is a pressure roller that urges the record-medium into frictional contact with the platen. The roller couple of the indented subclasses thus comprises a platen and a pressure roller cooperating to feed record-medium lying therebetween. The pressure roller is termed a "feed-roller" even though it may not be driven other

than by frictional contact with the platen or the record-medium.