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Typewriter Carriage Return with Index Inhibit

IP.com Disclosure Number: IPCOM000091895D
Original Publication Date: 1968-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Goble, CN: AUTHOR

Abstract

In the use of an electric typewriter for underscoring, typing equations and applying accent or other special marks for foreign languages, it is convenient to use the powered carriage return of the typewriter. In such cases, automatic forward rotational indexing of the platen is not desired. The electric typewriter includes base 10 upon which a carriage 12 is mounted for reciprocable side-to-side motion. Carriage 12 mounts a platen, not shown, which is indexed by operation of pawl 14 engaging ratchet wheel 16 clutched to the platen.

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Typewriter Carriage Return with Index Inhibit

In the use of an electric typewriter for underscoring, typing equations and applying accent or other special marks for foreign languages, it is convenient to use the powered carriage return of the typewriter. In such cases, automatic forward rotational indexing of the platen is not desired. The electric typewriter includes base 10 upon which a carriage 12 is mounted for reciprocable side-to- side motion. Carriage 12 mounts a platen, not shown, which is indexed by operation of pawl 14 engaging ratchet wheel 16 clutched to the platen.

The typewriter base carries a motor-powered assembly including pulley 18 which, when operated in direction 20, winds in the carriage return tape 22. The initial pull on tape 22 operates mechanism 24 to engage pawl 14 in ratchet 16 so as to index ratchet 16 in direction 26 for line spacing rotation of the platen. A pawl stop, not shown, limits the downward motion of pawl 14 for arresting the platen rotation at the desired line space increment. The tension on tape 22, no longer able to move mechanism 24, acts on idler pulley 28 to move carriage 12 in direction 30.

For providing an index inhibit arrangement, pulley 18 includes auxiliary reel 32 operable with it to wind in index inhibit control tape 34. The latter follows a path generally parallel to that of tape 22 until it reaches the index mechanism at which point it is trained over additional idler pulley 36. This brings tape 34 into front...