Coating device

Patent metadata

Field	Value
Publication number	US-11213839-B2
Application number	US-201916549467-A
Country	US
Kind code	B2
Filing date	Aug 23, 2019
Priority date	Sep 26, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A coating device includes a rotary head, a power supply part that applies a voltage to the rotary head, and a control part that controls the power supply part. The rotary head is configured so that a coating material is electrostatically atomized. The control part is configured so as to calculate a discharge current based on a total current flowing from the power supply part to the rotary head and a leak current, and control the power supply part based on the discharge current.

First claim

The invention claimed is:

1. A coating device comprising:
a rotary head;
a drive part that rotates the rotary head;
a coating material supply pipe that supplies a coating material to the rotary head;
a power supply part that applies a voltage to the rotary head;
a control part that controls the power supply part, and
a moving part that moves the rotary head and the workpiece relative to each other,

wherein:
the rotary head includes a diffusion surface where the coating material is diffused by centrifugal force to an outer edge portion, and a plurality of groove portions provided in the outer edge portion, the rotary head being configured so that the thread-shaped coating material is discharged from the groove portions, and that the thread-shaped coating material is electrostatically atomized;
the control part is configured so as to calculate a discharge current based on a total current flowing from the power supply part to the rotary head, and a leak current that leaks from the rotary head through the coating material supply pipe, and control the power supply part based on the discharge current, the discharge current being discharged from the rotary head towards a workpiece that is grounded; and
the moving part is configured to prohibit the rotary head and the workpiece from moving closer to each other when an absolute value of an output voltage of the power supply part is smaller than a given value.

2. The coating device according to claim 1 , wherein the control part is configured so as to control the output voltage of the power supply part so that the discharge current reaches a given target value.

Assignees

• Toyota Motor Co Ltd
• Trinity Ind Corp
• Ransburg Ind Finishing Kk

Inventors

• Tani Shinji
• Numasato Akira
• Tanaka Kazuki
• Kondo Takahito
• Murai Yuki
• Hirai Yuki
• Tomita Atsushi
• Okamoto Kenji
• Masuda Naohiro

Classifications

• B05B5/053 Primary

  Arrangements for supplying power, e.g. charging power · CPC title

• B05B5/006

  the adjustement of high voltage is responsive to a condition, e.g. a condition of material discharged, of ambient medium or of target · CPC title

• B05B5/08

  Plant for applying liquids or other fluent materials to objects · CPC title

• B05B5/0407 Primary

  with a spraying edge, e.g. like a cup or a bell · CPC title

• B05B5/043

  using induction-charging · CPC title