Single print element selection apparatus with multiple selection inhibiting means

摘要

Disclosed is a selection apparatus for a printer of the single element type wherein the single print element is carried by a print carrier. The carrier includes at least one cylinder having a plurality of axially spaced apart camming surfaces thereon, the cylinder mounted for both axial and rotational movement. Each of a plurality of selection pins is engageable with one of the camming surfaces to impart a predetermined but differing axial motion of the cylinder upon engagement of one of the pins with its associated camming surfaces and rotation of the cylinder. Pin selection apparatus permits engagement of selected ones of the pins with an associated camming surface, the pin selection apparatus including pin motion inhibiting apparatus associated therewith so as to inhibit multiple pin selection with associated camming surfaces to thereby prevent any attempt at differential camming of the cylinder along its axis by more than one pin engaging more than one camming surface.