Abstract: A wire matrix print head assembly in which the print wires are operably supported in one-piece bearing and guide passage block member in an elongated wire housing with wire actuating armature members arranged in a circular array between radially innermost and outermost poles of electromagnetic armature actuating devices and an armature retaining cover member centrally adjustably connected to the wire housing and having armature confining slots holding the armatures in pivotally displaceable operable association with the poles, the armatures being pivotally supported on the radially outermost edge surfaces of the outermost poles with or without resilient biasing devices continuously holding the armatures in engagement with the pole pivot surfaces without applying a moment of force and peripheral portions of the cover member being mounted in rigid abutting engagement with end surfaces of the outermost poles.

Abstract: A wire matrix print head assembly having bearing and guide apparatus for a plurality of circumferentially spaced reciprocable wire members comprising one or more elongated bearing members each having a plurality of elongated passages, there being one passageway in each bearing member for each wire member and the passageways for each wire member in each bearing member being aligned and interconnected to provide a continuous wire passage receiving a majoral portion of each wire member and comprising in sequence a relatively long length enlarged first inlet and guide portion; a relatively short length intermediate second bearing portion; a relatively long length intermediate third guide portion; a relatively short length intermediate fourth bearing portion; a relatively long length intermediate fifth guide portion; and a relatively short length terminal sixth bearing portion, the guide portion enabling continuous uninterrupted slidable insertion of the wire member during assembly while also enabling free recipro