EP0423820A2
Expired / Lapsed
EP
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Ink jet printer
Assignee: Seiko Epson Corp
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Filing: 1990-10-19
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Granted: —
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Expires: 2010-10-19
Abstract
Abstract In an ink jet printer having a sheet conveying mechanism which changes the speed of conveyance of a recording sheet (S) in accordance with the density of characters or a pattern to be printed to intermittently convey the recording sheet (S) in such a manner that all printed portions are properly dried before the sheet is conveyed to a subsequent position. The recording head (80, 82) of the printer performs a printing operation while pushing the front end portion of the recording sheet against the platen (46) with a sheet retaining lever (86).
Inventors
- 👤 Satoshi Fujioka
- 👤 Hiromu Hirabayashi
- 👤 Nobuhisa Takabayashi
- 👤 Atsushi Nishizawa
- 👤 Kiyoto Komuro
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:16
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/0015; B41J11/002; B41J11/0022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
An ink jet printer comprising: recording means (80, 82) for jetting ink droplets while moving in a direction perpendicular to the direction of conveyance of a recording medium (S), to form a dot image on said recording medium according to input data; recording medium drying means (90) arranged downstream of said recording means (80, 82); conveying means (58) for conveying said recording medium (S) through said recording means (80, 82) and said recording medium drying means (90); means (54) for detecting regions to be printed on said recording medium (S) having a large pixel density; and control means (53) for controlling the speed or timing of conveyance of said conveying means (54) in response to an output of said detecting means (54).
Claim 2
Dependent Claim
122 words
An ink jet printer comprising: recording means (80, 82) for jetting ink droplets while moving in a direction perpendicular to the direction of conveyance of a recording medium (S), to form a dot image on said recording medium according to input data; recording medium drying means (90) arranged downstream of said recording means (80, 82); conveying means (58) for conveying said recording medium (S) through said recording means (80, 82) and said recording medium drying means (90); means (54) for detecting regions to be printed on said recording medium (S) having a large pixel density; and control means (53) for controlling the speed or timing of conveyance of said conveying means (54) in response to an output of said detecting means (54).
Claim 3
Dependent Claim
27 words
The ink jet printer as claimed in claim 1, wherein said detecting means (54) further detects a pixel density of said regions having a large pixel density.
Claim 4
Dependent Claim
87 words
The ink jet printer as claimed in one of the preceding claims, further comprising a pair of sheet retaining means (86, 88) respectively arranged before and behind in the direction of travel of said recording means, said pair of sheet retaining means (86, 88) being operated in such a manner that the one of said pair of sheet retaining means arranged before in the direction of travel is displaced to push against said recording medium (S), while the other is displaced to leave from said recording medium.
Claim 5
Dependent Claim
35 words
The ink jet printer as claimed in claim 3, wherein each of said sheet retaining means (86) comprises: a solenoid (88) and a swingable sheet retaining lever (86) for swingably moving said swingable lever (86).
Claim 6
Dependent Claim
31 words
The ink jet printer asa claimed in claim 4, wherein said sheet retaining means further comprises a wheel (87) at a free end (86a) of said swingable sheet retaining lever (86).
Claim 7
Dependent Claim
40 words
The ink jet printer as claimed in one of the preceding claims, further comprising air stream directing means (83, 84) moved together with said recording means (80, 82) for directing air streams along said recording medium in a predetermined direction.
Claim 8
Dependent Claim
31 words
The ink jet printer as claimed in one of the preceding claims, further comprising web supplying means (15) and sheet supplying means (10) provided upstream of said recording means (80, 82).
Claim 9
Dependent Claim
44 words
The ink jet printer as claimed in one of the preceding claims further comprising sheet retaining means (29-35) provided upstream of said recording means (80,82) for adjusting a contact pressure according to whether individual sheets are suppplied or whether a continuous web is supplied.
Claim 10
Dependent Claim
87 words
The ink jet printer as claimed in one of the preceding claims, further comprising a roller (37) provided downstream of said recording means (80, 82) said roller (37) being operated after the rear edge of said recording medium (S) passes through sheet conveying means (21) located upstream of said recording means (80, 82), to convey said recording medium (S) while in contact with a dot image forming surface of said recording medium, said roller (37) being movable into and out of engagment of said recording medium (S).
Claim 11
Dependent Claim
85 words
The ink jet printer as claimed in one of the preceding claims further comprising a cylindrical roller (64) having a small wall thickness and which contacts the back side of said recording medium (S), and a plate-shaped roller (66) with peripheral teeth and which contacts a dot image forming side of said recording medium, said cylindrical roller (64) and said plate-shaped roller (66) being provided downstream of said recording means (80,82) in such a manner that said roller (64, 66) are confronted with each other.
References Cited (Backward Citations)
No citation records indexed.
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