Rotary atomizing head type coating device

US6230994A · kind A · utility

Assignees

• Asea Brown Boveri, S.A. · CH
• ABB K.K. · JP

Inventors

• Gunter Boerner · Sinsheim, DE
• Gert Stauch · Hof, DE
• Josef Wittmann · Hockenheim, DE
• Michio Mitsui · Yokohama, JP
• Kimiyoshi Nagai · Nanbu, JP

Key dates

• Filing date: Jun 13, 2000
• Grant date: May 15, 2001
• Expiry date: Jun 13, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05B5/0426
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A rotary atomizing head type coating machine which is arranged to prevent occurrence of spark discharges, including a rotational shaft (9) which is formed of an insulating material, a rotary atomizing head (11) which is likewise formed of an insulating material and mounted on a fore end portion of the rotational shaft (9). An on-head semi-conductive coat film (14) is formed on outer peripheral surfaces of the rotary atomizing head (11). On the other hand, a first arcuate coat film (16) is formed on a first limiter ring (15) which is provided on a motor body (6), and a second arcuate coat film (18) is formed on a second limiter ring (17) which is provided on the rotary atomizing head (11). Further, a power supply semi-conductive coat film (19) is formed on and around outer peripheral surfaces of the rotational shaft (9) between the arcuate coat films (16) and (18). A high voltage which is applied to the air motor 5 is supplied to paint releasing edges (12E) of the rotary atomizing head (11) through the first arcuate coat film (16), power supply semi-conductive coat film (19), second arcuate coat film (18) and on-head semi-conductive coat film (14).