For line-spacing by incremental rotation of platen > Patents

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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