US PATENT SUBCLASS 400 / 637
.~.~.~ Including lower feed-roller(s) (e.g., pressure roller, 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  DF  .~.~ By roller couple (e.g., rotatable pinch rollers, etc.) {8}
637.~.~.~ Including lower feed-roller(s) (e.g., pressure roller, etc.) {4}
637.1  DF  .~.~.~.~> Including concurrent control for disengagement of upper and lower feed rollers
637.2  DF  .~.~.~.~> Mounted on apron
637.3  DF  .~.~.~.~> Mounted on plural roller carriers {2}
637.6  DF  .~.~.~.~> Mounted on single carrier having pivot intermediate front and rear lower feed-rollers

DEFINITION

Classification: 400/637

Including lower feed-roller(s) (e.g., pressure roller, etc.):

(under subclass 636) Subject matter wherein significance is attributed to one or more feed-roller* elements that are located relative to the associated platen* adjacent to the underneath surface of the platen.

(1) Note. This subclass is for a typewriter wherein the lower-feed-rollers are disposed along a single axis.