Abstract A device adapted for use with electrophotographic image forming apparatus of the type in which the spacing between the voltage impressing station and the developing station for the recording sheet is smaller than the length of the recording sheet. The device is effective to reduce the voltage being impressed on an electrically conducting layer of the recording sheet substantially to the level of the ground potential or reference voltage immediately before the developing station by first impressing on the electrically conducting material layer of the recording sheet a bias voltage of opposite charge to a bias voltage impressed on the layer in the voltage impressing station on the upstream side of the developing station and then alternatingly impressing bias voltages of alternately varying polarities and successively decreasing absolute values on the electrically conducting material layer of the recording sheet, so as to improve the conditions under which the recording sheet is developed.
Inventors
👤 T Adachi
👤 K Kasuya
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 22:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A device for removing electric potential from an electrically conducting material layer of a recording sheet adapted for use with electrophotographic image forming apparatus of the type in which the spacing between the voltage impressing station and the developing station for the recording sheet is smaller than the length of the recording sheet, comprising bias voltages impressing means for first impressing on said electrically conducting material layer of said recording sheet on the upstream side of said developing station a bias voltage of opposite charge to the bias voltage impressed on the electrically conducting material layer at said voltage impressing station, and then alternately impressing bias voltages of different charges and successively decreasing absolute values on the electrically conducting material layer of the recording sheet till the electric potential carried by the electrically conducting material layer is reduced substantially to the level of the reference or the ground potential immediately before the developing station.
Claim 2
Independent Claim
154 words
A device for removing electric potential from an electrically conducting material layer of a recording sheet adapted for use with electrophotographic image forming apparatus of the type in which the spacing between the voltage impressing station and the developing station for the recording sheet is smaller than the length of the recording sheet, comprising bias voltages impressing means for first impressing on said electrically conducting material layer of said recording sheet on the upstream side of said developing station a bias voltage of opposite charge to the bias voltage impressed on the electrically conducting material layer at said voltage impressing station, and then alternately impressing bias voltages of different charges and successively decreasing absolute values on the electrically conducting material layer of the recording sheet till the electric potential carried by the electrically conducting material layer is reduced substantially to the level of the reference or the ground potential immediately before the developing station.
Claim 3
Dependent Claim
26 words
A device as set forth in claim 1 wherein said bias voltage impressing means comprises a plurality of electrically conducting rollers connected to a power source.
Claim 4
Dependent Claim
33 words
A device as set forth in claim 1 wherein said bias voltages impressing means comprises a plurality of electrically conducting rollers combined with a plurality of resistors and connected to a power source.