A print head (2) is disclosed which includes a unitary armature assembly including a thin resilient spring (67), thick structural members and cores upon which a magnetic flux path can be electrically imposed, such that motion of the armatures (58) is constrained to only the desirable back-and-forth axial movement of an ideal print stroke. Lateral movement of the armatures (58) is prevented, so that armatures wires (60) wear only very slowly, resulting in long and reliable service life. Improved performance for size is obtained by having the magnet plate (38) positioned with the working air gap on the outside and the return pole on the inside, with the armature pivot at the outside periphery of the print head (2), so that the larger magnet area imparts greater magnetic force, an increased length of the lever arm for the print wire (14), and enhancement of the print stroke and the printing performance of the device. The wire guide pattern (20) provides bidirectional and orthogonal printing capability. Heat transfer is obtained through a heat sink (82). A universal connection bracket (8) is provided for connection to numerous printers.
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