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Air/ Oil Blast Cleaning And Lubrication for Wire Matrix Print Head

IP.com Disclosure Number: IPCOM000048646D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Thorpe, AC: AUTHOR [+2]

Abstract

Fig. 1 illustrates a partial cross-sectional view through a typical wire matrix print head 1. The print head 1 is mounted on a carriage for reciprocation along the print line. The carriage and print line are not shown. The ends of the print wires 2 can accumulate paper dust, ribbon fibers and sludge from ribbon inks, causing the wires to develop excessive friction in the wire matrix wire guide 3. This causes sticking of the print wires and resultant deficiencies in the printed dots. A solution to the problem is described below.

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Air/ Oil Blast Cleaning And Lubrication for Wire Matrix Print Head

Fig. 1 illustrates a partial cross-sectional view through a typical wire matrix print head 1. The print head 1 is mounted on a carriage for reciprocation along the print line. The carriage and print line are not shown. The ends of the print wires 2 can accumulate paper dust, ribbon fibers and sludge from ribbon inks, causing the wires to develop excessive friction in the wire matrix wire guide 3. This causes sticking of the print wires and resultant deficiencies in the printed dots. A solution to the problem is described below.

An opening 8 is provided in the wire guide 3. The opening is provided with an atomizer orifice 7 connected to a flexible hollow tube 6. Hollow tube 6 communicates with a chamber 10 containing an air volume and an oil saturated wick material 4 that is easily compressible. Chamber 10 has an orifice 11 for admission of additional oil and is provided with an air inlet check valve 9 and check spring and ball mechanism 12. A plunger 13 is mounted in the bore of chamber 10 and is maintained in the outward position by return spring 5. As the print head 1 and carrier (not shown) move toward the left in the figure, plunger 13 will eventually contact a portion of the printer machine frame 14, forcing the plunger inward, compressing the wick material 4 and creating a blast of mixed oil and air at the atomizer orifice 7 which is directed at the print wires 2 in the opening 8 in the wire...