Patent US4411706A successfully refreshed from Google Patents.
US4411706A
Expired / Lapsed
US
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Method and apparatus for eliminating dust from ink jet printers
Assignee: Unisys Corp
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Filing: 1981-06-25
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Granted: 1983-10-25
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Expires: 2001-06-25
Abstract
Abstract Method and apparatus for preventing dust, which developes in document handling machines, from accumulating in the orifices of associated ink jet printers and clogging them, includes disrupting the path of dust laden air to prevent it from flowing near the orifices where dust would be deposited. In a preferred embodiment, a counterflow of air from a fan is directed against the dust laden air to disrupt its flow and cause the dust to be carried away from the orifices.
Inventors
- 👤 Harry L. Wallace
- 👤 John D. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:41
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/165; B41J2/16517; B41J2/16552
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
In a document processing machine including an ink jet printer having an ink jet head and means for transporting documents along a dusty pathway toward the ink jet head, a system for reducing the effects of dust transported to the ink jet head by a dust impregnated air stream, comprising: means for providing air under pressure; an assembly including a nozzle coupled with said means for providing air to direct the air as a stream-of-air along a restricted path; and means supporting said assembly in a manner to aim said stream-of-air into the path of said dust impregnated air stream causing a turbulent condition which diverts a substantial part of the dust away from the ink jet head.
Claim 2
Dependent Claim
118 words
In a document processing machine including an ink jet printer having an ink jet head and means for transporting documents along a dusty pathway toward the ink jet head, a system for reducing the effects of dust transported to the ink jet head by a dust impregnated air stream, comprising: means for providing air under pressure; an assembly including a nozzle coupled with said means for providing air to direct the air as a stream-of-air along a restricted path; and means supporting said assembly in a manner to aim said stream-of-air into the path of said dust impregnated air stream causing a turbulent condition which diverts a substantial part of the dust away from the ink jet head.
Claim 3
Dependent Claim
51 words
The invention as claimed in claim 1, in which: the assembly is positioned in close proximity to the ink jet head; and the means supporting said assembly is pivoted whereby the assembly may be moved away from proximity to the ink jet head to enable removal of the ink jet head.
Claim 4
Independent Claim
99 words
A method for preventing dust from accumulating on and around the jet head of an ink jet printer, where dust from a document processor is entrained in a first air-stream which carries the entrained air to the jet head, the method comprising: generating a second air-stream; controlling said second air-stream to cause the second air-stream to travel along a restricted path; and directing said second air-stream into the path of said first air-stream to produce a turbulent condition tending to disrupt the path of said first air-stream and divert the dust entrained therein away from the ink jet head.
Claim 5
Independent Claim
99 words
A method for preventing dust from accumulating on and around the jet head of an ink jet printer, where dust from a document processor is entrained in a first air-stream which carries the entrained air to the jet head, the method comprising: generating a second air-stream; controlling said second air-stream to cause the second air-stream to travel along a restricted path; and directing said second air-stream into the path of said first air-stream to produce a turbulent condition tending to disrupt the path of said first air-stream and divert the dust entrained therein away from the ink jet head.
Claim 6
Dependent Claim
33 words
The method of claim 3, comprising: changing the position of apparatus employed in the production of the second air-stream; whereby the ink jet head may be moved from a position near said apparatus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |