Boots – shoes – and leggings
Patent
1990-12-24
1993-01-26
Smith, Jerry
Boots, shoes, and leggings
364510, 118696, 239 69, G05B 1302, B05B 1214
Patent
active
051827042
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for regulating the spraying of coating materials and includes the steps: corresponding to a desired flow rate, with which it is desired to spray the coating material using the spray device; flow signal.
The present invention also relates to a device for regulating the spraying of coating materials comprising: for forming a true flow signal.
BACKGROUND ART
Spray pistols and nozzles for spraying different kinds of coating materials are well known. The most common sprayed coating material is paint, but even other materials such as vinyls are used.
When spraying paint and other coating materials it is of great importance that the work piece to be sprayed receives as even a coating as possible. This is for example the case when spray-painting car chassis, whereby spray-painting is carried out automatically or semiautomatically along an assembly line and is often performed by a robotic system. Since spray systems for different types of coating materials are principally the same, for the sake of simplicity, and without lessening its generality, the description below will refer to the spraying of paint.
Known paint spraying systems normally include a device for supplying paint which includes some form of pump, compressor, or pressure vessel for feeding paint under pressure; a paint pressure regulator or other actuator; and a spray nozzle, which is connected to the pressure regulator by means of a hose. Several factors contribute to the difficulties these known systems suffer from when it comes to ensuring that the paint coating of the work piece will be even.
An important factor which makes regulation of the flow of paint through the paint nozzle more difficult is the viscosity of the paint. Even in the presence of a constant supply pressure, a change in the viscosity leads to a change in the flow: The flow decreases when the viscosity increases, and increases when the viscosity decreases. Changes in viscosity may arise in different ways, e.g., as a result of the aging of the paint, the mechanical working of the paint and solvents in a circulation system, or the deliberate addition of solvents. The viscosity also decreases with increasing temperature and increases with decreasing temperature.
Another obvious factor which may influence the paint flow through the nozzle is a deliberate or inadvertant change in the supply pressure. Of course, no pump or compressor can achieve completely constant supply pressure, but even such an ideal pump would not be sufficient to maintain constant pressure to the other system components since elastic hoses are as a rule used for transporting the paint. The elasticity of the hoses causes the hoses to act as accumulators, with drops and build-ups of pressure when the pistol is activated and shut off.
The most obvious factor is that the spray system often needs to be able to change the paint flow in order to maintain evenness without unnecessary paint losses. An example of this is when the spray system must alternate between spraying a wide portion and a narrow portion of the work piece. If the flow of paint through the nozzle were to remain constant, the layer of paint on the narrow portion would be thicker if only the width of the paint jet were changed without changing the flow. If the width is not changed, the thickness might be correct on the narrow portion, but paint would be wasted and adjacent portions might be sprayed inadvertently. If the time between spray-painting the wide and the narrow portions must be short, the further problem arises that the time for readjustment of the paint spray system must also be very short, since any delay leads to unevenness.
Different types of controllable paint pressure regulators are known, but the most common type comprises a housing which is divided into three chambers. Paint under pressure is fed into an intake chamber. A central chamber has an outlet which leads to a spray nozzle via a hose. Paint entering the intake chamber can pass through a closable opening in a dividing w
REFERENCES:
patent: 4562552 (1985-12-01), Miyaoka et al.
patent: 4593360 (1986-06-01), Cocks
patent: 4614300 (1986-09-01), Falcoff
patent: 4660771 (1987-04-01), Chabert et al.
patent: 4928880 (1990-05-01), Prus et al.
patent: 4992952 (1991-02-01), Sasaki
Advanced Flow Control AFC Aktiebolag
Gordon Paul
Smith Jerry
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