Apparatus for controlling the toner concentration of a developer

Details Apparatus for controlling the toner concentration of a developer Apparatus for controlling the toner concentration of a developer

1977-02-24

1978-09-12

Stein, Mervin

Coating apparatus

With vacuum or fluid pressure chamber

118646, 427 18, G03G 1509

Patent

active

041128672

ABSTRACT:
An apparatus for controlling the toner concentration of a dry developer, including a magnetic carrier and a non-magnetic toner, used in a magnetic brush developing system. In view of that the system includes an inherent magnetic means and an inherent circulation path through a portion of which a steady stream of the developer is established during its operation, a means such as a Hall element is set at a position near to the steady stream portion of the developer and in the atmosphere for detecting the magnitude of a leakage magnetic flux from the portion which is emanated from said magnetic means to determine the value of toner concentration of the developer in the system through analyzing. Thereupon, a supply of toner to the system is automatically controlled based on the determined value.

REFERENCES:
patent: 3152924 (1964-10-01), Wanielista et al.
patent: 3802381 (1974-04-01), O'Neill et al.
patent: 3822139 (1974-07-01), Westdale
patent: 3892672 (1975-07-01), Gawnon
patent: 3893408 (1975-07-01), Lamel
patent: 3932034 (1976-01-01), Takahashi

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