Electrographic recording method and apparatus with control of toner quantity at recording region

摘要

An electrographic method and apparatus are provided for maintaining a controlled quantity of electronically conductive toner in the recording region formed between an array of stylus electrodes and a receptor recording member. A regular or relatively uniform supply of toner is provided to said recording region where a temporally constant force is presented which acts on the toner to establish an electronically conductive path via the toner between the electrodes and the recording member. Recording electrical potential signals selectively applied to the first electrodes relative to the recording member cause toner to be deposited on the recording member as image toner. A toner removal means provides a temporally constant force for removing excess accumulated toner from said recording gap to a point where it is out of electronic contact with the toner at the recording gap. Non-image toner removal means positioned at a point remote from the recording region is also disclosed.