Xerographic copying apparatus

Details Xerographic copying apparatus Xerographic copying apparatus

1983-02-09

1985-05-28

Weldon, Ulysses

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118689, 118690, 324204, G03G 1500

Patent

active

045196966

ABSTRACT:
A xerographic copying apparatus including a device for monitoring the concentration of toner in a xerographic developer mixture of ferromagnetic particles and non-ferromagnetic toner, said device comprising a measuring induction coil that is mounted close to the developer supply so that its magnetic field traverses a portion of the mass of the developer, and a reference induction coil that is mounted close to the measuring coil, but with its magnetic field prevented from traversing the developer mixture, and suitably closely on a wall of the hopper for the toner supply.

REFERENCES:
patent: 3698926 (1972-10-01), Furuichi
patent: 3999687 (1976-12-01), Baer et al.
patent: 4195260 (1980-03-01), Sakamoto et al.
patent: 4321886 (1982-03-01), Azuma

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