A modified wire guide and assembly method for facilitating the insertion of wires into a dot matrix print head. In the preferred embodiment, the wire guide has a planar surface with downwardly extending wire holes defined by first and second surfaces. The first surface has a truncated conical shape and the second surface has a cylindrical shape. Additionally, the wire guide has an upwardly extending, inclined cam surface that intersects the planar surface to form a closed path. The first surface defining each hole is positioned adjacent the cam surface and intersects the closed path so that a wire striking the cam surface will move down it toward and into one of the holes. The assembly method of the present invention involves inserting a wire through three wire guides using aids that apply a first force in a first direction to bow the wire and then apply a second force in an opposite direction to guide the wire through the print head.
This is a divisional application under 37 CFR 1.60, of pending prior application Ser. No. 616,792 filed on June 1, 1984 which is a division of U.S. patent application Ser. No. 499,208 filed May 31, 1983, now abandoned, which is a division of U.S. patent application Ser. No. 425,255 filed Sept. 28, 1982, now U.S. Pat. No. 4,401,392, which is a continuation of U.S. patent application Ser. No. 256,032 filed Apr. 21, 1981, now abandoned, which is a division of U.S. patent application Ser. No. 38,724 filed May 14, 1979, now U.S. Pat. No. 4,279,518, for a dot matrix print head.
A wire guide member for use in a wire type dot printer for guiding print wires and having a guide member with grooves. The wire guide member includes a first plate formed of synthetic resin, a second plate being formed of a wear resistant material and a third plate also formed of a synthetic resin. Through-holes in the plates are aligned to receive the print wires. Also disclosed is an assembly for supporting a member in a wire type dot printer.
A print wire driving device for a wire dot printer includes a plate like member having slots therein. The slots are arranged opposite the cores of a magnetic core block. The cores are arranged in a circle and project from the core block. The slots extend radially from the center of the plate like member. A magnetic driving member is received in each slot so that it pivots therein when acted upon by the magnetic field of a respective magnetic core. A print wire is coupled to each magnetic driving member. Each print wire is guided by a wire guide having a wire nose which receives at its end a wire guide member from which the ends of the print wires extend to print. The wire guide includes structure for properly aligning two stacks of magnetic actuators.
A print head for a dot matrix printer has a yoke having a plurality of cores, a plurality of armatures, each corresponding to the core, a plurality of knife edges is formed on the yoke, and a receiving corner is formed on the armature which engages the knife edge so as to be pivoted about the knife edge.
A wire dot printer using a plurality of print wires to print on a printing medium. The printer includes a print head unit, a guide member defining a wire nose mounted on one end of the print head unit, and a wire guide member mounted proximate one end of the guide member and including a plurality of openings for guiding the print wires. A supporting member is mounted on the guide member on the one end thereof and has a first surface for coupling the supporting member to a carriage. The supporting member has an end surface having an opening therein corresponding in shape to that of the end of the guide member supporting the wire guide member. The wire guide member is positioned and supported in the opening in the supporting member. The guide member also includes a plurality of spaced wire guide plates which include a plurality of holes aligned therein through which the print wires extend for guiding the print wires.
