Magnetic toner transfer method and apparatus

Details Magnetic toner transfer method and apparatus Magnetic toner transfer method and apparatus

1981-01-26

1983-07-12

Braun, Fred L.

Recorders

Electric recording

Electrochemical

355 3TR, 355 14TR, G01D 1506, G03G 1516

Patent

active

043933890

ABSTRACT:
Magnetographic printing, method and apparatus are used to generate letter-quality, relatively high speed transfer of magnetic toner particles from a magnetic tape to paper. A pretransfer force (f.sub.1) holding the toner to the tape is established which may be magnetic, or both magnetic and electrostatic in nature. The transfer operation employs relatively high speed approaching movement of the tape toward the paper in a controlled manner such that forces (f.sub.2) exerted on the toner particles due to the rapidly closing movement including forces created by air currents are collectively less than the toner-holding force (f.sub.1) for any instantaneous separation between the tape and paper. The operation may include the use of a bias voltage to generate a component of the electrostatic holding force and the use of a corotron to deposit electrostatic charge on the magnetic toner particles. The controlled movement of the tape toward the paper is achieved with a cam in one embodiment and with a solonoid in another embodiment.

REFERENCES:
patent: 3345944 (1967-10-01), Simmons
patent: 4131358 (1978-12-01), Windele
patent: 4140962 (1979-02-01), Quinn
patent: 4169673 (1979-10-01), Sato et al.
patent: 4175265 (1979-11-01), Nelson et al.
patent: 4260235 (1981-04-01), Stack

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