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3D printer

  • US 10,583,604 B2
  • Filed: 02/25/2015
  • Issued: 03/10/2020
  • Est. Priority Date: 02/25/2014
  • Status: Active Grant
First Claim
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1. A three-dimensional printer, comprising:

  • an extrusion apparatus including;

    a cylinder with a cylinder heater, the cylinder receiving a resin material therein, and the cylinder heater fusing the resin material in the cylinder;

    a screw arranged in the cylinder;

    a screw motor for rotating the screw;

    a gear pump with a gear pump heater, the gear pump being provided on a tip side of the screw;

    a gear pump motor for rotating the gear pump; and

    a nozzle with a nozzle heater; and

    a control apparatus configured to control an amount of a fused resin discharged from a tip of the nozzle of the extrusion apparatus, by controlling a rotation of the screw and a rotation of the gear pump,wherein the control apparatus is further configured to inversely rotate the screw and the gear pump by a predetermined amount such that the fused resin is prevented from dropping from the tip of the nozzle when the discharge of the fused resin is stopped during molding.

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