EP0023433A2
Expired / Lapsed
EP
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High speed ink jet recording apparatus
Assignee: Xerox Corp
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Filing: 1980-07-30
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Granted: —
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Expires: 2000-07-30
Abstract
Abstract A high speed ink jet recorder uses a plurality of equally spaced nozzles to write with fluid drops on a high speed rotating drum. The nozzles are spaced a given number of pixel positions apart. The nozzles simultaneously address all the pixels under them on a pixel by pixel basis during each revolution of the drum. The nozzles are displaced one pixel position each drum revolution. Therefore, after the number of drum revolutions equal to the spacing between nozzles, a full raster pattern of W x L pixels is addressed by the nozzles. The nozzles emit continuous streams of drops. An individual drop is charged if it is intended for the target. Uncharged drops are collected in a gutter and recirculated to the drop generator having the plurality of nozzles.
Inventors
- 👤 Thomas W. Warren
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:32
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/485; B41J2/505; B41J2/515; H; H04; H04N; H04N1/00; H04N1/024; H04N1/032; H04N1/034; H04N1/04; H04N1/19; H04N1/191; H04N1/1911; H04N1/1912
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
176 words
Ink jet recorder apparatus(l) including: a transport (4, 8, 47, 45) for moving a target (5) around a closed path at high speed; an ink drop generator (2) for generating a plurality of equally-spaced streams (7) of ink drops in a row transverse to the direction of movement of the target; means (25, 26) adjacent each stream for deflecting drop between trajectories that intersect either a gutter or the target path; means (42, 44, 43, 45) for displacing the drop generator (2) transversely to the target path, and raster control means (6, 55) for applying signals representative of raster pixel information to the deflection means simultaneously for all streams, characterised in that: the end streams of the generator are separated by the width of the raster iamge less the distance separating adjacent streams; in that the displacement means move the generator through one pixel position for each revolution of the transport, and in that the target is rotated through p revolutions per recording cycle, in which p is the number of pixel positions separating adjacent streams.
Claim 2
Dependent Claim
176 words
Ink jet recorder apparatus(l) including: a transport (4, 8, 47, 45) for moving a target (5) around a closed path at high speed; an ink drop generator (2) for generating a plurality of equally-spaced streams (7) of ink drops in a row transverse to the direction of movement of the target; means (25, 26) adjacent each stream for deflecting drop between trajectories that intersect either a gutter or the target path; means (42, 44, 43, 45) for displacing the drop generator (2) transversely to the target path, and raster control means (6, 55) for applying signals representative of raster pixel information to the deflection means simultaneously for all streams, characterised in that: the end streams of the generator are separated by the width of the raster iamge less the distance separating adjacent streams; in that the displacement means move the generator through one pixel position for each revolution of the transport, and in that the target is rotated through p revolutions per recording cycle, in which p is the number of pixel positions separating adjacent streams.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 characterised in that the target transport (4, 8, 47, 45) includes a drum (4) journalled for rotation and having means for supporting a target (5) about its outer periphery (62).
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 characterised in that the target transport further includes means for loading and unloading a target from the periphery of the drum.
Claim 5
Independent Claim
58 words
The apparatus of any preceding claim, characterised in that the target transport speed of revolution equals the product of the number of signals per second applied to the deflection means times 60 seconds divided by the product of the number of streams times the circumference of the target path times the number of pixels per unit of length.
Claim 6
Dependent Claim
63 words
The apparatus of claim 4 characterised in that the target transport speed is substantially 1670 rpm, which is based on a signal rate of 10 x 10 6 pixels per second, 100 streams from the generator, 12 pixels per millimeter, a drum circumference of 300 mm, whereby a raster image on a 200 x 300 millimeter target is created in about 0.86 seconds.
Claim 7
Independent Claim
83 words
The apparatus of any preceding claim, characterised in that the generator includes a block (15) having a chamber therein, means (16) for coupling the chamber to a source of ink under pressure, a plurality of nozzles (17) equally spaced in a row extending the width of a raster image to be created less p number of pixel positions, and an exciter for causing the ink streams to break into drops of uniform size and spacing at substantially the same distance from the nozzles.
Claim 8
Independent Claim
28 words
The apparatus of any preceding claim, characterised in that the deflection means includes a charging electrode (25) adjacent each stream of ink at the point of drop formation.
Claim 9
Dependent Claim
22 words
.8. The apparatus of claim 7, characterised in that the charging electrode is mechanically coupled to the generator for movement with it.
Claim 10
Dependent Claim
53 words
The apparatus of claim 7 or 8, characterised in that the deflection means includes parallel deflection electrodes (25, 26) parallel to the ink streams and coupled to a voltage source to establish an electric field between them for deflecting drops charged by the deflection means in a direction normal to their flight trajectory.
References Cited (Backward Citations)
US3596275A
Cited
US4069486A
Cited
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