Patent US5779377A successfully refreshed from Google Patents.
US5779377A
Expired / Lapsed
US
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Printing apparatus
Assignee: Seiko Epson Corp
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Filing: 1996-12-20
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Granted: 1998-07-14
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Expires: 2016-12-20
Abstract
Abstract A printing apparatus comprises: a print head comprising an array having an N (N=positive integer) number of dot forming elements arrayed at fixed pitches having a lower end and an upper end; a horizontal scan driver for moving the print head above and along a print medium in a horizontal scan direction; a vertical scan driver for moving the print medium in a vertical scan direction perpendicular to the horizontal scan direction, wherein a vertical scan distance that the print medium is vertically moved when the vertical scan driver is driven one time is selected such that the position of at least one dot forming element, counted from the lower end of the array of the print head in the drive of a horizontal scan is coincident with the position at least one dot forming element, counted from the upper end of the array of the print head in the drive of the horizontal scan drive after a given number of horizontal scan drives; and a head driver for performing a printing operation by intermittently driving the dot forming element located at the coincident positions, counted from the upper or lower end of the array.
Inventors
- 👤 Eiji Kumai
- 👤 Akira Takagi
- 👤 Satoshi Fujioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:59
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; G06K15/102; G06K15/105; G06K15/107
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
227 words
A printing apparatus comprising; a print head comprising an array having N dot forming elements arrayed at fixed pitches, said array having a lower end and an upper end; horizontal scan drive means for moving the print head above and along a print medium in a horizontal scan direction; vertical scan drive means for moving the print medium in a vertical scan direction perpendicular to the horizontal scan direction, wherein a vertical scan distance that the print medium is vertically moved, when the vertical scan drive means is driven one time is selected such that the position of at least one dot forming element from the lower end of the array is coincident with a previous position of at least another dot forming element from the upper end of the array, the coincident position defining a shared horizontal scan line; and head drive means for performing a printing operation by intermittently driving said at least one dot forming element and said another dot forming element to print in an intermittent manner with respect to said shared horizontal scan line; wherein a microweave pitch M by the vertical scan drive means and an element-to-element interval K are mutually prime, and M+t=N holds, where M=(vertical scan drive pitch by the vertical scan drive means)/(print resolution), K=(print resolution)/(nozzle pitch), and t=number of lines intermittently printed by the head drive means.
Claim 2
Dependent Claim
227 words
A printing apparatus comprising; a print head comprising an array having N dot forming elements arrayed at fixed pitches, said array having a lower end and an upper end; horizontal scan drive means for moving the print head above and along a print medium in a horizontal scan direction; vertical scan drive means for moving the print medium in a vertical scan direction perpendicular to the horizontal scan direction, wherein a vertical scan distance that the print medium is vertically moved, when the vertical scan drive means is driven one time is selected such that the position of at least one dot forming element from the lower end of the array is coincident with a previous position of at least another dot forming element from the upper end of the array, the coincident position defining a shared horizontal scan line; and head drive means for performing a printing operation by intermittently driving said at least one dot forming element and said another dot forming element to print in an intermittent manner with respect to said shared horizontal scan line; wherein a microweave pitch M by the vertical scan drive means and an element-to-element interval K are mutually prime, and M+t=N holds, where M=(vertical scan drive pitch by the vertical scan drive means)/(print resolution), K=(print resolution)/(nozzle pitch), and t=number of lines intermittently printed by the head drive means.
Claim 3
Dependent Claim
13 words
The printing apparatus according to claim 1, wherein t is 2 or 3.
Claim 4
Dependent Claim
9 words
The printing apparatus according to claim 1, wherein t=N/2.
Claim 5
Independent Claim
135 words
A method for printing comprising the steps of; moving a print medium in a vertical scan direction so that a position of at least one dot forming element of a array of N dot forming elements of a print head is coincident with a previous position of at least another dot forming element of said array after a given number of horizontal scan drives; and performing a printing operation by driving said at least one dot forming element and said at least another dot forming element to print in an intermittent manner with respect to a shared horizontal scan line defined by said coincident position; wherein a microweave pitch M and an element-to-element interval K are mutually prime, and M+t=N, where M=(vertical scan drive pitch)/(print resolution), K=(print resolution)/(nozzle pitch), and t=number of lines intermittently printed.
Claim 6
Independent Claim
135 words
A method for printing comprising the steps of; moving a print medium in a vertical scan direction so that a position of at least one dot forming element of a array of N dot forming elements of a print head is coincident with a previous position of at least another dot forming element of said array after a given number of horizontal scan drives; and performing a printing operation by driving said at least one dot forming element and said at least another dot forming element to print in an intermittent manner with respect to a shared horizontal scan line defined by said coincident position; wherein a microweave pitch M and an element-to-element interval K are mutually prime, and M+t=N, where M=(vertical scan drive pitch)/(print resolution), K=(print resolution)/(nozzle pitch), and t=number of lines intermittently printed.
Claim 7
Dependent Claim
12 words
The method according to claim 4, wherein t is 2 or 3.
Claim 8
Dependent Claim
8 words
The method according to claim 4, wherein t=N/2.
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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) | 2001-07-13 | 2002-01-12 | 2002-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-13 | 2006-01-12 | 2006-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-13 | 2010-01-12 | 2010-07-14 | $7700.00 | Window Closed / Lapsed |