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US5300950A
Expired / Lapsed
US
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Interlaced ink jet printer
Assignee: Ricoh Printing Systems America Inc
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Filing: 1992-04-30
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Granted: 1994-04-05
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Expires: 2012-04-30
Abstract
Abstract A row-interleaved printing method for use in phase change ink jet printers which minimizes appearance abnormalities when printing solid geometric shapes; minimizes the horizontal "banding-effect" caused by cross-talk between ink jets when all jets are activated; and minimize the "seaming effect" caused by paper step mechanisms when different velocity profiles are used during printing.
Inventors
- 👤 Juan E. Lopez
- 👤 Dung Do
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:12
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/145; B41J2/155
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
274 words
An improved process for printing onto a print region of a substrate for use in an ink jet printer having a print head comprised of a slanted array of 2n numbered jetting nozzles having a uniform spacing V in a first direction, n being a positive integer and the array including a first nozzle numbered 1 at a first end of the array and a last nozzle numbered 2n at a second end of the array, the nozzles being activated to jet ink droplets onto the substrate during successive passes of the print head over the substrate in a second direction, and the print region having first and second edges which are spaced apart in the first direction; the improved process comprising the steps of: (a) positioning the substrate opposite the print head so that the nozzle numbered n or n+1 is located substantially opposite the first edge of the print region and the nozzles between n or n+1 and 2n are located opposite the print region and then activating selected ones of only nozzles n to 2n or n+1 to 2n during a first pass of the print head to jet ink droplets; and (b) moving the substrate in the first direction relative to the print head, so that the first edge moves away from the array of nozzles, in a plurality of increments having increment lengths which alternate between an increment length of about (2n+1)·(V/2) and an increment length of about (2n-1)·(V/2), and effecting a pass of the print head in the second direction while activating selected ones of nozzles 1 to 2n after each increment of movement in the first direction.
Claim 2
Dependent Claim
274 words
An improved process for printing onto a print region of a substrate for use in an ink jet printer having a print head comprised of a slanted array of 2n numbered jetting nozzles having a uniform spacing V in a first direction, n being a positive integer and the array including a first nozzle numbered 1 at a first end of the array and a last nozzle numbered 2n at a second end of the array, the nozzles being activated to jet ink droplets onto the substrate during successive passes of the print head over the substrate in a second direction, and the print region having first and second edges which are spaced apart in the first direction; the improved process comprising the steps of: (a) positioning the substrate opposite the print head so that the nozzle numbered n or n+1 is located substantially opposite the first edge of the print region and the nozzles between n or n+1 and 2n are located opposite the print region and then activating selected ones of only nozzles n to 2n or n+1 to 2n during a first pass of the print head to jet ink droplets; and (b) moving the substrate in the first direction relative to the print head, so that the first edge moves away from the array of nozzles, in a plurality of increments having increment lengths which alternate between an increment length of about (2n+1)·(V/2) and an increment length of about (2n-1)·(V/2), and effecting a pass of the print head in the second direction while activating selected ones of nozzles 1 to 2n after each increment of movement in the first direction.
Claim 3
Dependent Claim
7 words
The process of claim 1 wherein n=8.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein V=2/300th of an inch.
Claim 5
Dependent Claim
22 words
The process of claim 3 wherein the ink is a phase change ink and the printer is a phase change ink printer.
Claim 6
Dependent Claim
273 words
In an improveed ink jet printer having a print head comprised of a slanted array of 2n numbered jetting nozzles having a uniform spacing V in a first direction, n being a positive integer and the array including a first nozzle numbered 1 at a first end of the array and a last nozzle numbered 2n at a second end of the array, the nozzles being activated to jet ink droplets onto a print region of a substrate during successive passes of the print head over the substrate in a second direction, and the print region having first and second edges which are spaced apart in the first direction; the improvement comprising: control means for positioning the substrate opposite the print head so that the nozzle numbered n or n+1 is located substantially opposite the first edge of the print region and the nozzles between n to 2n or n+1 and 2n are located opposite the print region and then activating selected nozzles, said control means having means for: (1) activating only selected ones of nozzles n or n+1 to 2n during a first pass of the print head to jet ink droplets; and (2) advancing the substrate in the first direction relative to the print head, so that the first edge moves away from the array of nozzles, in a plurality of increments having increment lengths which alternate between an increment length of about (2n+1)·(V/2) and an increment length of about (2n-1)·(V/2), and effecting a pass of the print head in the second direction while activating selected ones of nozzles 1 to 2n after each increment of movement in the first direction.
Claim 7
Dependent Claim
273 words
In an improveed ink jet printer having a print head comprised of a slanted array of 2n numbered jetting nozzles having a uniform spacing V in a first direction, n being a positive integer and the array including a first nozzle numbered 1 at a first end of the array and a last nozzle numbered 2n at a second end of the array, the nozzles being activated to jet ink droplets onto a print region of a substrate during successive passes of the print head over the substrate in a second direction, and the print region having first and second edges which are spaced apart in the first direction; the improvement comprising: control means for positioning the substrate opposite the print head so that the nozzle numbered n or n+1 is located substantially opposite the first edge of the print region and the nozzles between n to 2n or n+1 and 2n are located opposite the print region and then activating selected nozzles, said control means having means for: (1) activating only selected ones of nozzles n or n+1 to 2n during a first pass of the print head to jet ink droplets; and (2) advancing the substrate in the first direction relative to the print head, so that the first edge moves away from the array of nozzles, in a plurality of increments having increment lengths which alternate between an increment length of about (2n+1)·(V/2) and an increment length of about (2n-1)·(V/2), and effecting a pass of the print head in the second direction while activating selected ones of nozzles 1 to 2n after each increment of movement in the first direction.
Claim 8
Dependent Claim
7 words
The printer of claim 5 wherein n=8.
Claim 9
Dependent Claim
10 words
The printer of claim 6 wherein V=2/300th of an inch.
Claim 10
Dependent Claim
22 words
The printer of claim 5 wherein the ink is a phase change ink and the printer is a phase change ink printer.
Claim 11
Dependent Claim
16 words
The printer of claim 8 wherein the phase change ink printer is of the impulse type.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |