Knife Edge Armature Pivot in Wire Matrix Print Head and Retention Spring Therefor
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
Fig. 1 illustrates an improved cut-away partial section of a wire matrix print head utilizing knife edge pivot for the armatures which reduces friction and maintains the armature seated with an appropriate air gap between it and the energizing electromagnet for the armature. Armature 1, of which only one is shown in the drawings, is typically made of magnetic iron or steel. A rubber O-ring backstop, shown in cross section, is illustrated as the backstop 2. The head or driven end of the print wire 3 is illustrated housed within its bore and shows print wire 4 attached thereto housed within a print wire guide 5 mounted to frame 6 that is also part of the flux return path from the electromagnet 13 to the heel end of armature 1.