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Developing Magnetic Images From a Fluidized Magnetic Ink Bed

IP.com Disclosure Number: IPCOM000097841D
Original Publication Date: 1961-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Burns, RC: AUTHOR

Abstract

Magnetic images are produced by record head 10 on the surface of a magnetic drum 11. Dry magnetic ink particles 12 from hopper 13 applied to the surface of 11 develop the magnetic images. These are transferable to a print medium, such as paper 14, by the application of pressure from roller 15. Excess particles of ink remaining on the surface of 11 are removed by a cleaning mechanism 16 having a rotatable brush 17.

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Developing Magnetic Images From a Fluidized Magnetic Ink Bed

Magnetic images are produced by record head 10 on the surface of a magnetic drum 11. Dry magnetic ink particles 12 from hopper 13 applied to the surface of 11 develop the magnetic images. These are transferable to a print medium, such as paper 14, by the application of pressure from roller 15. Excess particles of ink remaining on the surface of 11 are removed by a cleaning mechanism 16 having a rotatable brush 17.

The application of the magnetic-ink particles to the surface of 11 is performed by passing the drum through a bed of dry magnetic particles 12a located in the lower portion of hopper 13. Air from conduit 18 is supplied to the bottom of bed 12a through perforated bed plate 19. The air pressure is of sufficient magnitude to cause the bed of particles on 19 and in contact with surface of drum 11 to be fluidized. Baffle 20, located downstream from the fluidized bed, is contoured to provide a nozzle effect proximate the surface of magnetic drum 11. The function of baffle 20 is to converge particles from the fluidized bed so as to accelerate them to a speed equal to the linear velocity of the surface of drum 11. Particles in the nozzle region, not attracted by magnetic images to the surface of the drum, move beyond the end of baffle 20 and return to the fluidized bed for re- circulation.

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