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Shown and described is a mechanism allowing forward and reverse indexing via pin feed platen on an impact printer for use in a word processing system.
English (United States)
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Page 1 of 2
Reverse Index Assembly
Shown and described is a mechanism allowing forward and reverse indexing
via pin feed platen on an impact printer for use in a word processing system.
Reverse index ratchet 1 and forward index ratchet 2 are mounted on a sleeve
bearing (not shown). Platen locating bushing 3 is free to rotate between ratchets
1 and 2. Lever 4 straddles the locating bushing channel and is operable to lock
out detent means (not shown) so that the platen may rotate freely. In this way,
long sheets or continuous forms may be removed from the printer without
actuating the detent means.
The teeth on ratchets 1 and 2 are angled in opposite directions.
Reverse index ratchet 1 has teeth going in clockwise directions so that when
drivingly engaged, the platen rotates counterclockwise, resulting in reverse
indexing of the print receiving medium. Forward indexing is achieved in a similar
Page 2 of 2
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