Patent Document ID: 4088217
Application ID: 05765279

Base Claim:
1. Apparatus for selectively changing ball-type typing elements on a single-type- element typewriter, comprising a guide means extending transversely along the top surface of the typewriter, a substantially vertical stanchion supported for movement along said guide means to a position adjacent any print position work area of said typewriter, a ball-support assembly mounted on said stanchion and free to pivot about an axis transverse to the typewriter, and a plurality of ball support members attached to said ball support assembly and each said ball support member extending radially from a central axis and rotatable thereabout, said central axis intersecting and being perpendicular to said transverse axis, whereby said ball-support assembly may be normally positioned remotely from the work area so as not to obscure or interfere with the typing operation, but any chosen ball support member may by selective rotation about said axes be moved to and from the work area for removal and replacement of the typing elements.

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Claim 2:
2. Apparatus according to claim 1 in combination with a plurality of ball elements each of which is designed to print a part but not the whole of at least certain typed characters, said balls being positioned on the ball support assembly in coded relationship to facilitate rapid and accurate composite typing.