Ink jet recording process and an apparatus therefor
Printhead cartridge and carriage assembly
Print cartridge alignment in paper axis Patent #: 5297017
ApplicationNo. 056959 filed on 05/03/1993
US Classes:347/8, Of spacing between fluid ejector and receiving medium347/43, Color type400/59By adjustment of carriage (e.g, carriage-guide rollers)
ExaminersPrimary: Fuller, Benjamin R.
Assistant: Barlow, John E. Jr.
Attorney, Agent or Firm
Foreign Patent References
International ClassB41J 025/308
AbstractColor inkjet printers commonly employ a plurality of print cartridges, usually either two or four, mounted in the printer carriage to produce a full spectrum of colors. In order to optimize print quality, it is desirable to minimize the distance between a thermal inkjet printhead and the media that is being printed on. In a multiple printhead printer only one printhead can be the closest one to the media due to the various mechanical tolerances of the printer. Since black text print quality is more sensitive to printhead-to-media distance than is color graphics quality, the overall print quality of both black text and color graphics is optimized by assuring that the black print cartridge is closest to the media. Disclosed is a method for determining the relevant tolerances affecting printhead-to-media distance, analyzing the tolerance values to determine the range of tolerances and the greatest variation between one print cartridge and another, such that a determined percentage of the sampled print cartridges fall within this variation. This value is then used to offset the black print cartridge carriage slot so that the black print cartridge will be closest to the media.
Field of SearchOf spacing between fluid ejector and receiving medium
Creating plural tones
With means to scan fluid ejector relative to the receiving medium
Array of ejectors
By adjustment of platen relative to carriage
By adjustment of carriage (e.g, carriage-guide rollers)
INCLUDING ADJUSTMENT FOR OPTIMUM PRINTING PLANE