Abstract:
Apparatus for providing the charged particles includes an electrically insulative belt having a surface upon which the organoplastic material is placed and transported to an electrical charging and atomizing zone. Positioned within the charging and atomizing zone is means having an extended or elongated edge at high electrical potential. The extended edge is so positioned as to be substantially transverse of and in close proximity with the surface of the insulative means transporting the organoplastic material. A high intensity electric field extends from the extended edge to, or in some instances, through the substrate if the substrate is porous and fabricated from an insulative rather than a conductive material. The position of the extended edge at high electrical potential relative to the organoplastic material causes the organoplastic material to be formed into charged particles that are projected toward and deposited upon the substrate.
Abstract:
METHOD AND APPARATUS FOR APPLYING A METALLIC COATING ON METAL STRIP, PARTICULARLY STEEL STRIP, BY ELECTROSTATICALLY DEPOSITING ON THE STRIP A UNIFORM LAYER OF METAL POWDER AND THEREAFTER SUBJECTING THE STRIP AND THE LAYER OF METAL POWDER TO HEAT TREATMENT AND THEN COMPACTION TO EFFECT
COHESION OF THE PARTICLES OF METAL POWDER AND ADHESION OF THE METAL POWDER PARTICLES TO THE STRIP.
Abstract:
A method and apparatus for electrostatically charging material to be sprayed onto a surface, by pressing the material to be sprayed between two electrodes of a condenser positioned in a spaced-apart relationship and insulated from each other by a dielectric. One of the electrodes is connected to a high-voltage, low-amperage power supply and the other electrode is grounded to create a uniform electrical field through which the material to be sprayed is passed for achieving a strong, uniform electrostatic charging of all the material to be sprayed while requiring less voltage and current for operation than the prior art devices and methods.
Abstract:
An electrostatic spray gun having physically integral therewith a power pack for transforming low voltage supplied to the gun to high voltage for application to the gun electrode. The power pack is contained completely within the gun, and includes a combined oscillator and transformer which converts low voltage d.c., e.g., 11 volts, supplied to the gun via a low voltage cable to an intermediate voltage at high frequency, e.g., 6,000 volts peakto-peak at 45 KHz; and a voltage multiplier circuit which transforms the high frequency 6,000 volt peak-to-peak power to 72,000 volts d.c. for application to the gun electrode.
Abstract:
Development electrode apparatus is provided in accordance with the teachings of the present invention wherein at least two development electrodes are employed at a developing station in electrophotographic apparatus. The first development electrode presented to a latent electrostatic image undergoing development displays characteristics which are optimum for high rates of developer flow and hence only reduced development of portions of a latent electrostatic image exhibiting low charge densities and extended areas is achieved but may be accompanied by optimum cleaning. The second development electrode presented to the latent electrostatic image to be developed displays characteristics which are optimized to complete low contrast and extended area development; however, as the majority of developer material is removed, no inhibition of the developer flow occurs at said second development electrode.
Abstract:
In an electrostatic copying apparatus, a flow control for a cascade developer material having ferromagnetic carrier particles comprising a means for selectively establishing a magnetic field in he flow path of the developer material. The developer material does not contact moving elements in the described control and malfunctions resulting from the particulate characteristic of the material are eliminated.
Abstract:
A powder applicator nozzle is set at an acute angle to the direction of travel of the workpiece. The applicator has corona charging pins to impart an electric charge to the powder coming from the nozzle. Powder is jetted from a powder nozzle past the corona charging pins. Air under pressure is used for cleaning the charging pins to avoid powder particles clinging to the pointed tip and destroying its electrical characteristics.
Abstract:
This invention concerns a spray nozzle fed with the powder conveyed in an air stream constructed so that expansion of the air conveying the powder is effected in the nozzle and the spread of the spray jet issuing from the nozzle is adjusted by regulating the flow of an auxiliary jet of air which whirls about the air stream conveying the powder. In a specific embodiment the nozzle comprises a conduit having a downstream portion of larger cross-section than the cross-section of an upstream portion thereby forming an expansion chamber in the nozzle; and the jet of whirling air is admitted to the nozzle conduit downstream of the expansion chamber. A conductive core is mounted coaxially in the nozzle conduit and is adapted to be connected to a source of high voltage. The ionization means for ionizing the air conveyed powder are at the outlet of the nozzle.
Abstract:
While being nonrotatably transported along a flight conveyor, glass containers are electrostatically treated with colored metal oxide film-forming organometallic compounds. The organometallic compounds are electrostatically sprayed in a nonflammable solvent system containing a halogenated solvent while a horizontal flow of air is provided across the flight conveyor in impinging relation with respect to the container being treated.
Abstract:
A roller for pneumatically supporting copy sheets in the transfer station of a xerographic machine. The roller is electrically biased to transfer toner images from a photoreceptive member to copy sheets supported on the roller. Recirculation of the roller may effect the transfer of superimposed images to the backing sheets.