Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1999-02-08
2000-12-05
Nguyen, Thinh
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 16, B41J 2145, B41J 215, B41J 2938
Patent
active
061556688
ABSTRACT:
The technique of extending a printable area, in which an image can be recorded, by carrying out a sub-scan with rollers in a delivering section of a printer having a lower accuracy of sheet feeding often causes dropout of raster lines and thereby deteriorates the picture quality of a resulting printed image. In an ink jet printer of the present invention, the interlace method is applied to record an image in a first area where rollers in a feeding section ensure the accuracy of sheet feeding, in order to attain the high picture quality. The printable area Is extended to a second area, where the rollers in the delivering section are used to carry out the sheet feeding of the lower accuracy after the lower end of a printing medium comes off the rollers in the feeding section. In the present invention, recording of dots is carried out by the interlace method with a reduced number of working nozzles in the second area. This decreases each amount of sub-scan and thereby reduces an error in sheet feeding. The method of enabling each raster line to be formed with different nozzles or the method of creating large dots having a greater diameter may also be applied to form raster lines in the second area. Single or combined application of these techniques significantly improves the picture quality in the second area.
REFERENCES:
patent: 4198642 (1980-04-01), Gamblin
Momose Hiroaki
Otsuki Koichi
Nguyen Thinh
Seiko Epson Corporation
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