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Class Information
Number: 400/545
Name: Typewriting machines > For line-spacing by incremental rotation of platen
Description: 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.


Sub-classes under this class:

Class Number Class Name Patents
400/549 Actuated by key on key-board 10
400/570 By double-cam drive 9
400/568 By electric-power drive 120
400/571 By friction drive (e.g., including regulation of increments) 5
400/569 By gear train (e.g., including a clutch) 58
400/555 By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.) 18
400/572 By pawl and ratchet wheel drive 12
400/554 For facilitating even wear of platen surface (e.g., by irregular increments, etc.) 5
400/551 For line-spacing in forward or reverse direction 42
400/550 For multi-incremental rotation (e.g., "platen sweep") 16
400/546 To facilitate condensed billing (i.e., by determining a desired limit or amount of retrograde or advance platen movement) 0
400/576 Via foldable line-space actuator 0
400/553 Via line-space / carriage-feed-release actuator 1
400/552 With "floating" platen 3
400/577 With means to prevent reverse rotation or ensure full increment (e.g., for "backlash" prevention) 19


Patents under this class:

Patent Number Title Of Patent Date Issued
7463004 Planetary dual stepper drives Dec. 9, 2008
6816281 Storage of labels in a printing device Nov. 9, 2004
5462371 Indexing planetary gear train for a printer Oct. 31, 1995
5380106 Single motor scanning-head printer Jan. 10, 1995
5018886 Recording apparatus May. 28, 1991
4958949 Drive element for platens of typewriters or similar office machines Sep. 25, 1990
4739316 Structure of portable electronic apparatus Apr. 19, 1988
4591882 Printer electromagnetic clutch drive May. 27, 1986
4239405 Form aligning knob Dec. 16, 1980
4167345 Printing apparatus with selectively movable printing heads Sep. 11, 1979



 
 
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