EP0034060A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ink jet printer
Assignee: Mead Corp
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Filing: 1981-02-06
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Granted: —
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Expires: 2001-02-06
Abstract
Abstract An ink jet printer for depositing drops along a plurality of print lines (10) on a moving print receiving medium (12) to form a print image thereon includes print heads (14,16) for generating jet drop streams directed at the print receiving medium to strike the medium at print positions (21) arranged in first and second rows (22, 24). Drops deposited at print positions (21) in the first row (22) form a first group (26) of print lines on the medium and drops deposited at print positions (21) in the second row (24) form a second group (28) of print lines on the medium, with the first and second groups of print lines overlapping. Drops deposited at the first row of print positions are deposited along print lines to one side of a stitch point (32), while drops deposited at the second row of print positions are deposited along print lines to the other side of the stitch point (32). Means is provided for varying the stitch point during printing.
Inventors
- 👤 Barry Curtis Kockler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:10
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/145; B41J2/155; G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; G06K15/102; G06K15/105; G06K15/107
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
322 words
An ink jet printer for depositing drops along a plurality of print lines (10) on a moving print receiving medium (12) to form a print image thereon, characterized in that said printer comprises: print head means (14, 16) for generating jet drops directed at said print receiving medium to strike said print receiving medium at print positions (21) arranged in a first row (22), selectively depositing drops at print positions along associated ones of a first group of print lines (26) in response to print control signals, and for generating jet drops directed at said print receiving medium to strike said print receiving medium at print positions (21) arranged in a second row (24), selectively depositing drops at print positions along associated ones of a second group of print lines (28) in response to print control signals, a number of said first group of print lines overlapping a corresponding number of said second group of print lines, with the print positions in said second row which are associated with overlapping print lines being displaced in the direction of movement of said print receiving medium from the print positions in said first row which are associated with overlapping print lines, means (34) for providing a plurality of print control signals, each print control signal controlling printing by said print head means, along an associated one of said print lines, and dither means (Figs. 4-6), responsive to said means for providing print control signals, for supplying said print control signals to said print head means such that selected ones of said overlapping print lines are printed by deposition of drops at said first row of print positions and the remaining ones of said overlapping print lines are printed by deposition of drops at said second row of print positions, with the print lines printed by deposition of drops at each of said rows of print positions being varied during printing of said print image.
Claim 2
Dependent Claim
322 words
An ink jet printer for depositing drops along a plurality of print lines (10) on a moving print receiving medium (12) to form a print image thereon, characterized in that said printer comprises: print head means (14, 16) for generating jet drops directed at said print receiving medium to strike said print receiving medium at print positions (21) arranged in a first row (22), selectively depositing drops at print positions along associated ones of a first group of print lines (26) in response to print control signals, and for generating jet drops directed at said print receiving medium to strike said print receiving medium at print positions (21) arranged in a second row (24), selectively depositing drops at print positions along associated ones of a second group of print lines (28) in response to print control signals, a number of said first group of print lines overlapping a corresponding number of said second group of print lines, with the print positions in said second row which are associated with overlapping print lines being displaced in the direction of movement of said print receiving medium from the print positions in said first row which are associated with overlapping print lines, means (34) for providing a plurality of print control signals, each print control signal controlling printing by said print head means, along an associated one of said print lines, and dither means (Figs. 4-6), responsive to said means for providing print control signals, for supplying said print control signals to said print head means such that selected ones of said overlapping print lines are printed by deposition of drops at said first row of print positions and the remaining ones of said overlapping print lines are printed by deposition of drops at said second row of print positions, with the print lines printed by deposition of drops at each of said rows of print positions being varied during printing of said print image.
Claim 3
Dependent Claim
93 words
An ink jet printer as claimed in claim 1 further characterized in that said dither means comprises means (46, 101, 102) for supplying print control signals to control printing by deposition of drops at said first row of print positions along priht lines to one side of a stitch point and for supplying print control signals to control printing by deposition of drops at said second row of print positions along print lines to the other side of the stitch point, whereby said stitch point is varied during printing of said print image.
Claim 4
Dependent Claim
158 words
An ink jet printer as claimed in claim 1 further characterized in that said dither.means comprises, first gating means (40) for supplying print control signals to said print head means to control deposition of drops at said first row of print positions along said overlapping print lines in response to gating control signals, second gating means (42) for supplying print control signals to said print head means to control deposition of drops at said second row of print positions along said overlapping print lines in response to gating control signals, means (34) for supplying print control signals to said first gating means, means (44) for supplying delayed print control signals to said second gating means, and means (46, 101) for providing varying gating control signals to said first and second gating means, whereby said overlapping print lines of said print image are printed by depositing drops at varying ones of said first and second rows of print positions.
Claim 5
Dependent Claim
139 words
An ink jet printer as claimed in claim 3 further characterized in that said means for providing varying gating control signals comprises gating control signal generator means (46) for sequentially generating a first set of gating control signals, means (70-98), responsive to said gating control signal generator means, for supplying said first set of gating control signals to said first gating means (40) for controlling deposit of drops at said first row of print positions along said overlapping print lines, and delay means (101), responsive to said gating control signal generator means, for delaying a second set of gating control signals by a predetermined time period, and for supplying said second set of gating control signals to said second gating means (42) for controlling deposit of drops at said second row of print positions along said overlapping print lines.
Claim 6
Dependent Claim
31 words
An ink jet printer as claimed in claim 4 further characterized in that said first set of gating control signals is the complement of said second set of gating control signals.
Claim 7
Dependent Claim
19 words
An ink jet printer as claimed in claim 2 further characterized in that said stitch point is varied randomly.
Claim 8
Dependent Claim
19 words
An ink jet printer as claimed in claim 2 further characterized in that said stitch point is varied cyclically.
Claim 9
Dependent Claim
158 words
An ink jet printer as claimed in claim 1 further characterized in that said dither means comprises: first gating means (40) for supplying print control signals to said print head means to control deposition of drops at said first row of print positions along said overlapping print lines in response to gating control signals, second gating means (106,44) for supplying print control signals to said print head means to control deposition of drops at said second row of print positions along said overlapping print lines in response to gating control signals, said second gating means including means/for delaying said print control signals, means (34) -for supplying print control signals to said first and second gating means, and means (46) for providing varying gating control signals to said first and second gating means, whereby said overlapping print lines of said print image are printed by depositing drops at varying ones of said first and second rows of print positions.
Claim 10
Dependent Claim
29 words
An ink jet printer as claimed in claim 3 or 8 further characterized in that said means for providing varying gating control signals provides randomly varying gating control signals.
Claim 11
Dependent Claim
29 words
An ink jet printer as claimed in claim 3 or 8 further characterized in that said means for providing varying gating control signals provides cyclically varying gating control signals.
References Cited (Backward Citations)
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