Abstract: An electrographic apparatus which makes use of a corona charge device and which is constructed to effectively remove detrimental gas such as ozone and dust produced in the corona charge device. The apparatus comprises a drum type screen photosensitive body rotatably mounted on a rotatable shaft and a substantially hermetically sealed cylindrical cover for surrounding the photosensitive body. The cylindrical cover is provided at its periphery with an air inlet opening and an ion outlet opening opposed to an ion discharge wire provided for the corona charge device. A fan is opposite the air inlet opening and is provided at its suction side with a filter and a heater.

Abstract: A corona generating device having an elongated generally U-shaped shield and a corona wire mounted within and extending along the length of the shield has an improved cleaning apparatus for cleaning both the interior surface of the shield and the wire. The cleaning apparatus includes a block slidably mounted within the shield so that the block can be moved back and forth along the shield, and a disposable cap which locks onto the block over the corona wire. The cap has cleaning pads mounted thereon for cleaning the interior surface of the shield, and a protrusion and recess are used to lock the cap onto the block in an operative position in which the cleaning pads contact the interior surface to be cleaned. Separate disposable pads for cleaning the corona wire are located between the block and cap, and when the cap is replaced, these wire cleaning pads are replaced also.

Abstract: Method and apparatus for enhancing charge retention of a photosensitive layer wherein an ion wind is created and applied to the photosensitive material prior to its reuse. The apparatus preferably comprises a corona charging unit having an opening and directing means adjacent the opening for directing the flow of ions created during corona charging into an uncharged portion of the photosensitive layer.