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Color ink-jet printer

  • US 4,511,907 A
  • Filed: 10/19/1983
  • Issued: 04/16/1985
  • Est. Priority Date: 10/19/1982
  • Status: Expired due to Term
First Claim
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1. An ink-jet printer comprising:

  • a paper-feed control mechanism;

    a printing mechanism containing print heads each Provided with a plurality of nozzles arranged vertically and substantially in the direction of paper feeding;

    a carriage-feed control mechanism carrying said printing mechanism, moving at a constant speed in the horizontal direction, and outputting position detection signals;

    a buffer circuit for temporarily storing input data transmitted from outside;

    a dot pattern storage circuit for converting data output from said buffer circuit into a dot pattern and storing it;

    a print head control circuit outputting timing signals for driving said print heads, in synchronization with the position detection signals output from said carriage-feed control mechanism;

    a print head driving circuit unit for driving the print heads according to dot pattern data signals output from said dot pattern storage circuit, in synchronization with the timing signals from said print head control circuit;

    a control unit for controlling all of said circuit units;

    a first print head recording section being composed of said buffer circuit, said dot pattern storage circuit, said print head control circuit, said print head driving circuit, and a first print head mechanism wherein a plurality of nozzles are arranged in the vertical direction substantially in the direction of paper feed;

    a second print head recording section being composed of a second buffer circuit, a second dot pattern storage circuit, a second print head control circuit, a second print head driving circuit, a second print head mechanism wherein a plurality of nozzles are arranged in the vertical direction substantially in the direction of paper feed, and a delay memory circuit which is inserted between said second dot pattern storage circuit and said second print head control circuit and which generates a dot shift between the first print head mechanism acting as a baseline to the second print head mechanism in order to print and record dots at the same positions of and superimposed over dots printed and recorded on a sheet of paper by the first print head recording section; and

    a third print head recording section having a similar circuit constitution to that of said second print head recording section, the delay memory circuit in said third print head recording section being a delay memory generating a dot shift from the first print head mechanism acting as a baseline to a third print head mechanism unit.

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