Browse Prior Art Database

Knife Edge Armature Pivot in Wire Matrix Print Head and Retention Spring Therefor

IP.com Disclosure Number: IPCOM000039708D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Thorne, WD: AUTHOR [+2]

Abstract

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.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Knife Edge Armature Pivot in Wire Matrix Print Head and Retention Spring Therefor

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. A pivot block 8 is mounted on the upturned end of frame 6 and supports the knife edge

(Image Omitted)

bearing pivot 9 which engages with the groove in the end of the armature 1. An armature retention spring 10 engages the backside of the pivot block 8 and the inner periphery of an aperture 15 formed in armature 1 to hold the V-shaped groove at the heel of armature 1 into close magnetic connection with the pivot 9 in the pivot block 8. Pivot block 8 is also made of magnetic material and may be of porous sintered metal of a magnetic type to provide lubrication for the pivoting member. A back cover 11 secured by a nut or similar fastening means 12 maintains the backstop 2 in position and retains the retainer spring 10 in its position. A wavy washer 7 bears against the underside of projections on the back cover 11 and, in conjunction with the screw thread 12, allows for slight gap adjustment between t...