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Unitary Molded Wire Guide and Back Cover

IP.com Disclosure Number: IPCOM000044538D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR

Abstract

In wire matrix print head structures, an elongated wire guide unitarily molded on the back cover to contain the wires, armatures and coil assembly within the yoke or housing is described. A simple retaining ring snaps over the wire guide to fasten the yoke assembly to the wire guide which forms the basic framework or structure for the print head assembly. Fig. 1 illustrates an exploded simplified view of the elements of the present design. A molded unitary wire guide 1 contains numerous channels (not shown) for guiding the wires 10 in a straight line path, as will be described. A molded, unitarily formed portion 2 serves as a back cover. The back cover has a plurality of molded shaped recesses 3 adapted to the shape and size of the individual flap armatures 4 which nest within the recesses 3.

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Unitary Molded Wire Guide and Back Cover

In wire matrix print head structures, an elongated wire guide unitarily molded on the back cover to contain the wires, armatures and coil assembly within the yoke or housing is described. A simple retaining ring snaps over the wire guide to fasten the yoke assembly to the wire guide which forms the basic framework or structure for the print head assembly. Fig. 1 illustrates an exploded simplified view of the elements of the present design. A molded unitary wire guide 1 contains numerous channels (not shown) for guiding the wires 10 in a straight line path, as will be described. A molded, unitarily formed portion 2 serves as a back cover. The back cover has a plurality of molded shaped recesses 3 adapted to the shape and size of the individual flap armatures 4 which nest within the recesses 3. A residual magnetism shield 5 is shown in position to slide over the guide 1. The residual magnetism path interrupter 5 sits on top of the coil winding assembly 6. This is a group of separate windings on sleeves which may be held together by a flat cable carrying the pairs of conductors that form the windings as shown by the cable 6A. The coil assembly nests in a cage of magnetically permeable steel formed as a plurality of upturned fingers 7 that form a yoke assembly that completes the flux path. A base plate 8 holds the yoke assembly 7 in position and may be formed as a mounting plate for the print head. A retaining ring 9 is positioned to snap over the barrel of the wire guide 1. Upon assembly, the individual armatures 4 are nested in the recesses 3, the wires 10 are inserted in holes in the wire guide 1 with springs 12 placed beneath the anvil head 11 on the driven end of the wires. Then the back cover and nosepiece 1, 2 are slid into position and locked tightly t...