US PATENT SUBCLASS 400 / 545
FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN

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

545FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
546  DF  .~> To facilitate condensed billing (i.e., by determining a desired limit or amount of retrograde or advance platen movement) {2}
549  DF  .~> Actuated by key on key-board
550  DF  .~> For multi-incremental rotation (e.g., "platen sweep")
551  DF  .~> For line-spacing in forward or reverse direction
552  DF  .~> With "floating" platen
553  DF  .~> Via line-space / carriage-feed-release actuator
554  DF  .~> For facilitating even wear of platen surface (e.g., by irregular increments, etc.)
555  DF  .~> By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.) {6}
568  DF  .~> By electric-power drive
569  DF  .~> By gear train (e.g., including a clutch)
570  DF  .~> By double-cam drive
571  DF  .~> By friction drive (e.g., including regulation of increments)
572  DF  .~> By pawl and ratchet wheel drive {3}
576  DF  .~> Via foldable line-space actuator
577  DF  .~> With means to prevent reverse rotation or ensure full increment (e.g., for "backlash" prevention)

DEFINITION

Classification: 400/545

FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN:

(under the class definition) Subject matter wherein a typewriter is provided with a cylindrical platen* and wherein significance is attributed to the turning of said platen in step by step manner to effect line-space* distances to a piece of record-medium* that is held to and backed by said platen.

(1) Note. As discussed in the definition of "line-space" in the Glossary, section III, line-space is usually effected in units of one, two or three line-spaces, and sometimes effected in half spaces (e.g., one-half, one and one-half or two and one-half), but rarely more than three line-spaces in any single unit of movement. In some typewriters provision is made for multi-incremental line-spacing, which is the rotation of a platen through increments greater than three line-spaces, usually for the purpose of quickly moving a sheet of record-medium out of the typewriter, or for the purpose of effecting a line-space distance between the end of one paragraph of text and the start of another paragraph, which distance is greater than normal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44+, for line spacing of a flat platen.