Indexing planetary gear train for a printer

Details Indexing planetary gear train for a printer Indexing planetary gear train for a printer

1994-06-21

1995-10-31

Burr, Edgar S.

Typewriting machines

For line-spacing by incremental rotation of platen

By gear train

400545, 400551, B41J 1702

Patent

active

054623715

ABSTRACT:
An indexing double planetary gear train forms a portion of a feed system for accurately advancing a print media sheet through a printer. The planetary gear train has primary and secondary rings coupled to a sun gear by a series of planet gear clusters. Each planet gear cluster has primary and secondary planet gears which engage the respective primary and secondary rings. By assembling at least two of the gear train components to be fully indexing, and through the use of the identical planet gear clusters formed in a single mold, imperfections in the planet clusters and the rings, such as tooth-to-tooth defects or eccentricity, are canceled and have no effect on the accuracy of the line feed increments. Thus, more accurate and uniform media advance is achieved using plastic molded gears which are also relatively low in cost to manufacture and easy to assemble.

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