Patent Document ID: 3972281
Application ID: 05489611
Patent Flag: 1

Claim One:
1. In an adjustable-facet print mechanism a plurality of endless print-facet carriers arranged side-by-side and movable independently of one another around a common axis to adjust the print-facets operative at any given setting, each said carrier comprising a print wheel of annular form having an internal annulus of teeth, adjusting means accessible for actuation laterally of an outermost one of said print-facet carriers for adjusting at any given setting a selected one of the carriers to provide an alternative operative print-facet of that carrier, said adjusting means being arranged to engage the carriers internally and being common to all said carriers, and comprising a splined shaft engageable selectively with the annulus of teeth of each print wheel, selecting means for coupling the adjusting means to a selected said print-facet carrier, said selecting means being accessible for actuation at a position at least substantially aligned with the actuation position of the adjusting means, and comprising a plurality of part-circular members, one being disposed within each print wheel and a member movable within the print wheels along a path parallel to the common axis of the wheels and so disposed that when lying within a selected wheel the part-circular member thereof shifts the selected wheel so that the internal annulus of teeth thereof meshes with the splined shaft whereby the wheel can be adjusted to a fresh operative facet by rotation of the shaft, prismatic read-out means for displaying visually and positively the characters of those print-facets of the carriers which are operative at any given setting in an array which corresponds substantially with that of the print-facets themselves.