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US 5,852,759 AGranted
Electrostatographic developing device with toner dosage reservoir
AssigneeAgfa-Gevaert
InventorsLeo Vackier, Paul Konings, Luc Van Goethem
Life of this patent
Estimating the term…
Abstract
An electrostatographic developing device (15) including a magnet roller (16), a chamber (41) for two-component developer, a holder (22) for toner and a toner dosage reservoir (45) with an opening closed by a magnetic plug (58) of developer, and a magnet (53) for controlling such magnetic plug.
Claims16
An electrostatic developing device comprising:
- a housing having an elongated peripheral opening;
- a magnetic roller rotatably mounted in said elongated peripheral opening, said magnetic roller having a surface for holding magnetically attractable developer for use in developing an electrostatic image formed on an electrostatic support passed in close proximity to said magnetic roller;
- a toner chamber in said housing for holding toner;
- a developer chamber in said housing for holding said developer;
- means for adding said toner stored in said toner chamber to said developer stored in said developer chamber to form fresh developer, said means comprising
- a dosage reservoir having an open upper end defined by an upper rim, and a lower end;
- means for filling said dosage reservoir with said toner so that when said dosage reservoir is in an upright position, said toner forms a pile having an upper level located above said upper rim;
- and
- means for emptying at one time the entire toner contents of said dosage reservoir into said developer chamber to form said fresh developer.
6 more elements
A first cylindrical housing rotatable about a horizontal axis, said cylindrical housing having mounted therein at least four electrostatic developing devices spaced circumferentially around said cylindrical housing, each said electrostatic developing device comprising:
- a second housing having an elongated peripheral opening;
- a magnetic roller rotatably mounted in said elongated peripheral opening, said magnetic roller having a surface for holding magnetically attractable developer for use in developing an electrostatic image formed on an electrostatic support passed in close proximity to said magnetic roller;
- a toner chamber in said second housing for holding toner;
- a developer chamber in said second housing for holding said developer;
- means for adding said toner stored in said toner chamber to said developer stored in said developer chamber to form fresh developer, said means comprising
- a dosage reservoir having an open upper end defined by an upper rim, and a lower end;
- means for filling said dosage reservoir with said toner so that when said dosage reservoir is in an upright position, said toner forms a pile having an upper level located above said upper rim;
- and
- means for emptying at one time the entire toner contents of said dosage reservoir into said developer chamber to form said fresh developer.
6 more elements
An electrostatic developing device comprising:
- a housing having an elongated peripheral opening;
- a magnetic roller rotatably mounted in said elongated peripheral opening, said magnetic roller having a surface for holding magnetically attractable developer for use in developing an electrostatic image formed on an electrostatic support passed in close proximity to said magnetic roller;
- a toner chamber in said housing for holding toner;
- a developer chamber in said housing for holding said developer;
- means for adding said toner stored in said toner chamber to said developer stored in said developer chamber to form fresh developer, said means comprising
- at least two dosage reservoirs, each said dosage reservoir having an open upper end defined by an upper rim, and a lower end;
- means for filling each said dosage reservoir with said toner so that for each said dosage reservoir, when said dosage reservoir is in an upright position, said toner forms a pile having an upper level located above said upper rim of said dosage reservoir;
- and
- for each said dosage reservoir, means for emptying at one time the entire toner contents of said dosage reservoir into said developer chamber to form said fresh developer.
6 more elements
Dependencies are inferred from the claim text.