Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Nozzle cleaner – flusher or drainer
Patent
1998-08-03
2000-04-18
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Nozzle cleaner, flusher or drainer
239105, 239106, 239223, 239224, 239293, 239296, 239700, 239703, 239705, B05B 1502, B05B 310
Patent
active
060504994
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a rotary atomizing head type coating machine particularly suitable for use in paint coating operations involving color changes.
2. Discussion of the Background
Generally, rotary atomizing head type coating machines are largely constituted by: a cover which is formed in a cylindrical shape; an air motor which is provided within the cover; a rotational shaft which is provided axially in and rotated by the air motor; a rotary atomizing head which is mounted axially in the rotational shaft and put in high-speed rotation by the rotational shaft; and a feed tube provided axially in the rotational shaft, and having a fore end extended into the rotary atomizing head for spouting thereinto a paint or a thinner as a solvent.
In turn, the above-mentioned rotary atomizing head is constituted by: a bell cup which is formed in a bell- or cup-like shape; a hub member which is located on the inner peripheral side of the bell cup and defines thereon a paint reservoir for holding a pool of paint supplied through the paint feed tube; a plural number of paint outlet holes provided on the outer peripheral side of the hub member to permit the paint supplied through the feed tube to flow out from the paint reservoir toward marginal releasing edge at the fore end of inner peripheral surface of the bell cup; and a plural number of solvent outlet holes provided in center portion of the hub member to permit the thinner supplied through the feed tube to flow out from the paint reservoir toward the front side of the hub member.
The above-mentioned feed tube is connected to a color changing valve device which supply paint, air and thinner through a paint supply pipe. Further, the coating machine is connected to a high voltage generator to apply negative high voltage in electrostatic coating operations.
With a conventional rotary atomizing head type coating machine which is arranged in this manner, a coating operation is started firstly by supplying compressed air to the air motor to put the rotary atomizing head in high speed rotation together with the rotational shaft. In the next place, a paint is spouted out from the feed tube into the paint reservoir which is provided on the rotary atomizing head. As a result, the paint is urged to flow along inner peripheral surface of the bell cup and, after being spread into a thin film, sprayed as charged paint particles from the marginal releasing edge at the fore end of the bell cup. At this time, the change paint particles, which are released from at marginal edge of the rotary atomizing head, are urged to fly toward a coating object along lines of electric force of an electrostatic field which is formed between the coating object, and to deposit on the coating object.
Further, it becomes necessary to change the paint color, air and thinner are supplied to the rotary atomizing head from the color changing valve device, thereby washing away the previous color which has deposited on liquid-contacting surfaces of the rotary atomizing head. Then, a paint of a different color is supplied to the paint supply passage in preparation for a coating operation with a new color.
However, at the time of supplying paint of a fresh color as described above, it is often the case that the new color deposits on front surface of the hub member as well as on outer peripheral surface of the bell cup. Besides, the paint which has deposited on the rotary atomizing head undergoes solidification while a coating line is stopped for a certain time period due to a trouble on the line or for a lunch-time break. Similarly, paint deposition and accumulation takes place when a paint of same color is used for hours.
In such a case, it becomes necessary to wash solidified paint deposits off the liquid-contacting surfaces of the rotary atomizing head since otherwise defoliated fragments of solidified paint will make coating defects.
In this regard, in order to wash deposited paint off the rotary atomizing head, while the rotational shaft and rotar
REFERENCES:
patent: 4572437 (1986-02-01), Huber et al.
patent: 5106025 (1992-04-01), Giroux et al.
patent: 5707009 (1998-01-01), Schneider
patent: 5813608 (1998-09-01), Yoshioka et al.
patent: 5862988 (1999-01-01), Van Der Steur
patent: 5894993 (1999-04-01), Takayama et al.
Ikeda Shogo
Kon Masatoshi
Takayama Shinichi
ABB K. K.
Evans Robin O.
Morris Lesley D.
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