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X-Y plotter incorporating non-impact, liquid jet recording instrument

  • US 3,968,498 A
  • Filed: 06/03/1974
  • Issued: 07/06/1976
  • Est. Priority Date: 07/27/1973
  • Status: Expired due to Term
First Claim
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1. A non-impact, liquid jet recording apparatus for use in an X-Y plotter of a type which comprises a support table adapted to support a recording medium thereon, an X-axis carriage mounted for parallel movement across said support table in the direction of the X-ordinate, a Y-axis carriage mounted on said X-axis carriage for movement in the direction of the Y-ordinate, a first drive unit for moving said X-axis carriage and a second drive unit for moving said Y-axis carriage, said apparatus comprising:

  • a recording head rigidly carried by said Y-axis carriage and including a nozzle through which a liquid marking medium is jetted onto the recording medium, means for supplying said liquid marking medium to the exit of said nozzle, and an electrode member spaced from the exit of said nozzle and situated above said recording medium;

    electrical means coupled to said electrode and said nozzle for applying a potential between said nozzle and said electrode member for establishing therebetween an electrostatic field required to attract said liquid marking medium from the exit of said nozzle; and

    circuit means for controlling said electrical means to cause said electrical means to operate in such a manner as to jet said liquid marking medium in a varying amount substantially proportional to the recording velocity which is defined by the square root of the sum of the second powers of the velocities of movement of said carriages.

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