Abstract:
An improved hand held rotary atomizer spray gun is disclosed. The spray gun includes a housing with a depending handle. A paint tube within the housing delivers paint to a rotatable bell atomizer which is mounted adjacent the front of the gun. A turbine assembly includes a turbine rotor which drives a turbine shaft which mounts the bell atomizer. The turbine shaft is supported by a bearing air chamber. A turbine air passageway and a bearing air passageway supply turbine air to the turbine rotor and bearing air to the bearing air chamber. When a trigger is squeezed paint is supplied to the atomizer bell while turbine air rotates the turbine shaft and the bell atomizer. An air shuttle assembly prevents air flow to the turbine unless sufficient bearing air is flowing to the bearing air chamber. In a preferred embodiment shaping air is supplied to shaping air openings in a housing air cap and the atomizer bell includes serrations on its inner edge. The shaping air directs the atomized paint particles toward the target. A supplemental crossover passageway provides shaping air to the turbine to maintain proper turbine speed during initial delivery of paint to the atomizing bell. In another embodiment, a high voltage ladder is mounted within the handle and its outlet internally charges the paint to a high voltage. In this embodiment electrostatic forces and mechanical forces are used to atomize the paint particles.
Abstract:
A bell head of a rotary atomizing electrostatic coating apparatus includes a bell head body made from high electric resistance material, a semi-conductive layer formed on an outside surface of the bell head body, and a high electric resistance layer formed on an outside surface of the semi-conductive layer. The high electric resistance layer is also of a chemical-proof and of a thinner-proof type.
Abstract:
A fluent, electrically non-insulative coating composition for an electrically non-conductive rotary atomizer comprises about one-tenth to about one-seventh, by weight, short oil alkyds, about one-fourth to about one-third, by weight, phenolic, and about one-half to about two-thirds, by weight, powdered mixture of oxides of antimony and tin, all in a fluid carrier.
Abstract:
A spray painting nozzle designed as a spindle supporting a gas bearing and incorporating a stationary part and a part rotatably supported in relation thereto, which latter carries a rotatable spray painting cup and being adapted to be driven by a drive unit, whereby the spray painting cup is equipped with a supporting system comprising mutually plane-parallel bearing surfaces formed in the stationary and in the rotatable parts, and with a supply of a gaseous medium for causing a slot generated as an axial gas bearing therebetween, the rotatable part being radially guided by a magnetic force for centering the rotatable part in relation to the stationary part, the supporting system further being equipped with symmetrically provided holder magnets for limitation of the size of the slot, and where for supply of spray medium to the spray painting cup, there is provided a supply path extending through the plane of the gas bearing.
Abstract:
The present invention is directed to an atomizing method for atomizing a fluid atomizing material. The method includes feeding the fluid atomizing material into jet air. According to a feature of the instant invention, there is provided a method which includes jetting a pair of planar jet air flows through nozzle tips towards a center axis of an atomization material supply means, forming an air chamber which converges at a forward end, followed by supplying the, thus formed, air chamber with the fluid atomizing material in a non-atomizing form. The atomization material supply means includes fluid atomizing material such as molten metal droplet fused by arc heat, paint, blast material, adhesive, powder, etc.
Abstract:
An OFF/OFF valve including a fluid passage formed in the valve body, and having a valve seat, a smaller diameter portion extending from the valve seat on a downstream side of the valve seat, and a larger diameter portion extending from the smaller diameter portion on a downstream side of the smaller diameter portion. A valve element is disposed so as to be movable between a position adjacent the valve seat and a position within the larger diameter portion. The valve element is driven by a valve element driving assembly. When the valve is closed, the valve element moves toward the valve seat. When the valve element moves within the smaller diameter portion, the fluid which has passed through the valve element is drawn back due to the pumping effect of the valve element before the valve element finally reaches the valve seat and the valve is completely closed.
Abstract:
The rotary atomizer coater is particularly adaptable to a high voltage rotary atomizer coater which can be robot mounted. A rotatable bell cup, which is mounted on a turbine driven shaft is positioned within a housing. A fluid tube within the housing includes a fluid discharge tip which extends through an inlet opening in the bell cup for supplying charged coating fluid directly to the inner surface of the bell cup interior which is open to atmosphere. An electrical resistor is mounted between the fluid discharge tip and a power supply within the housing. When a grounded object approaches the bell cup, the current between the bell cup and the grounded object will increase and voltage drop across the resistor results, thereby reducing the voltage at the bell cup and diminishing the potential for a high energy spark.
Abstract:
A herein is a method of and an apparatus for electrostatically spray-coating a workpiece with electrically-conductive paint. The workpiece is first sprayed with the paint directly subjected to a high voltage from a rotatable atomizing type spray gun so as to electrostatically coat the work with the paint. Thereafter, cleaning liquid is supplied to a rotatable atomizing head through a line for washing after completion of the electrostatic spray coating process so as to clean the rotatable atomizing head. Further, after the rotatable atomizing head has been washed, the line is dried, and the next electrostatic spray coating process is carried out after the line has been dried. The spray gun includes an inner line as a path, for supplying the paint to the rotatable atomizing head, and an outer line as a path used for washing, for supplying the cleaning liquid used to wash the rotatable atomizing head. The inner line oriented toward the rotatable atomizing head has a terminal which projects forward from a terminal of the outer line.
Abstract:
An apparatus for fabricating hemispherically bichromal balls, comprising a separator member having opposing first and second surfaces located and an edge region in contact with both surfaces, and delivery means for flowing first and second colored hardenable liquid material over the first and second surfaces, respectively, so that the liquid materials arrive at the edge at substantially the same flow rate and form a reservoir outboard of the edge region. The reservoir comprises side-by-side regions of different colors which do not intermix. Further means is provided for propelling the first and second liquid materials away from the separator member and out of the reservoir into a fluid medium as a plurality of side-by-side bichromal streams whose forward ends become unstable and break up into droplets which form into spherical balls, each of the balls comprising hemispheres of differently colored hardenable liquid, and means for collecting the bichromal balls.
Abstract:
A process for coating a substrate such as a photoreceptor is performed by delivering at least two fluid streams to a bell of a rotary atomizer, combining the fluid streams substantially at the bell of the rotary atomizer such that the bell atomizes and mixes the fluid streams into a substantially homogenous atomized mixture, and depositing the mixture onto the substrate in the form of a layer on the substrate. The process is useful for depositing a plurality of different substances, such as two charge generating pigments, on the surface of a substrate such as a photoreceptor. Because the substances are combined substantially at the bell of the rotary atomizer and subsequently dried or polymerized, different substances can be incorporated into a single layer on the substrate that would normally not be combinable due to interaction between the plurality of substances such as agglomeration.