Coating apparatus – Control means responsive to a randomly occurring sensed... – Responsive to attribute – absence or presence of work
Patent
1997-07-25
1999-11-23
Simmons, David A.
Coating apparatus
Control means responsive to a randomly occurring sensed...
Responsive to attribute, absence or presence of work
118316, 118314, 118315, 239296, 239297, B05C 1100, B05B 708
Patent
active
059893443
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCES TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
BACKGROUND OF THE INVENTION
This application is a 371 of PCT/EP96/05228, filed Nov. 26, 1996.
Field of the Invention
The invention relates to an atomizing head and to a device for spraying workpieces with liquids by using such atomizing heads.
Atomizing heads of the type are found in diverse forms by way of atomizing heads in commercially available spray guns.
Atomizing heads of this type generally produce an axially symmetrical cone of droplets having a predetermined apex angle. If it is desired, with the aid of atomizing heads of this type, to spray workpieces with a liquid within a precisely predetermined edge contour, which is often rectangular or polygonal, the apex angle of the cone of droplets has to be chosen to be small and the surface to be sprayed has to be traversed with a propelled atomizing head, a procedure which is time-consuming and which in the case of automation necessitates a high degree of effort for a coordinate drive of the atomizing head and the control thereof. If working is effected with a relatively large number of atomizing heads that are distributed in accordance with the surface region to be covered, then in view of the costs of an atomizing head and the installation associated with it this again represents a considerable effort. In addition, the readjustment of an appropriate arrangement of fixed atomizing heads from one surface geometry to be sprayed to another is associated with many mechanical alterations and a great deal of time.
SUMMARY OF THE INVENTION
The object of the invention is to provide a device that improves spraying workpiece surfaces.
It has now been discovered that, in many cases, the spraying of partial regions of workpiece surfaces having rectangular or polygonal edge contours can be simplified by making use of nozzle heads that generate a cone of droplets having a non-circular cross-section. Cross-sections of this type are, for example, narrow rectangles. With such cross-sections of the cone of droplets it is possible for workpieces which are propelled in front of a atomizing head or a series of atomizing heads to be sprayed in very precise manner.
In order to obtain this advantage, an atomizing head according to the invention has, in addition to the nozzle device that atomizes the liquid, a droplet-cone forming-nozzle device is provided which directs jets of air against the cone of droplets which at first is axially symmetrical and in this way imparts polygonal cross-sectional shape to the latter, in particular widens it by pressure so as to form a flat rectangular cone.
An atomizing head having an advantageous feature of the invention, wherein the forming-air nozzle assembly comprises two forming-air channels that are located opposite one another with respect to the axis of the dosing aperture generates a cone of droplets having a transverse cross-section corresponding to a narrow rectangle, the narrow sides of which are constituted by small semicircles. In other words: by means of the control-nozzle device the cone of droplets is pressed flat, as a result of which its dimension is reduced in one direction and increased in the other direction.
In the case of an atomizing head having an advantageous feature of the invention, wherein the forming-air nozzle assembly comprises at least two sets of forming-air nozzles that are connected independently of one another to the source of forming air or to different sources of forming air the cone of droplets generated by the atomizing-nozzle device can also be flattened asymmetrically.
In the case of an atomizing head having an advantageous feature of the invention, wherein atomizing-air connection means in the housing to be connected to the source of atomizing air is connected to a working volume of a compressed-air servomotor, a drive part of which operates on the dosing needle, together with the application of pressure by means of atomizing air, the supply of liquid t
REFERENCES:
patent: 1369520 (1921-02-01), Day
patent: 1474324 (1923-11-01), Holton
patent: 1609465 (1926-12-01), Day
patent: 2152767 (1939-04-01), McKnight
patent: 2401503 (1946-06-01), Paasche
patent: 2976329 (1961-03-01), Wabnitz
patent: 3168250 (1965-02-01), Paasche
patent: 4370994 (1983-02-01), Nagata et al.
patent: 4531675 (1985-07-01), Muck
patent: 4852773 (1989-08-01), Standlick et al.
patent: 5135172 (1992-08-01), Toth
patent: 5180104 (1993-01-01), Mellette
patent: 5344078 (1994-09-01), Fritz et al.
patent: 5419491 (1995-05-01), Breitsprecher
patent: 5577666 (1996-11-01), Shen
Klaschka GmbH & Co.
Padgett Calvin
Simmons David A.
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