Coating apparatus – With means to apply electrical and/or radiant energy to work... – With electromagnetic and/or electrostatic removal of...
Patent
1976-08-18
1978-01-10
Feldbaum, Ronald
Coating apparatus
With means to apply electrical and/or radiant energy to work...
With electromagnetic and/or electrostatic removal of...
355 3DD, 118657, B05B 502
Patent
active
040672964
ABSTRACT:
A magnetic roller comprising a diamagnetic cylinder rotatable about magnets extending axially inside the cylinder is made to inhibit escape of magnetically attractable powder particles from the surface of the cylinder by providing the magnets, or a cylindrical magnet composed of several of them, with means which form in the magnetic field near each end of the cylinder a spirally extending bandlike field range which deviates in field strength from that existing in other regions of the cylinder surface. The bandlike ranges preferably have a reduced field strength and are formed by grooves made in the surface of the magnets and/or by applied strips of material having a greater magnetic permeability than air. They preferably extend from the extremities of the magnets spirally inward in the direction of the rotation of the cylinder, so that powder particles will be displaced inwardly from them as the cylinder rotates.
REFERENCES:
patent: 3233587 (1966-02-01), Morton
patent: 3464383 (1969-09-01), Knechtel
patent: 3557751 (1971-01-01), Kushiwa
patent: 3643311 (1972-02-01), Knechtel et al.
Dunne Gerard F.
Feldbaum Ronald
Johnston Albert C.
Oce'-van der Grinten N.V.
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