Image-forming apparatus and image-forming unit

An image-forming apparatus including an image-forming unit,

• wherein the apparatus comprises means for electric charging of a photosensitive material drum having an organic photosensitive layer, means for exposure to light, means for developing and a transfer member for transferring a toner image formed on the photosensitive material drum to a transfer paper, wherein the photosensitive material drum rotates a plurality of times in order to form the image on one transfer paper;
• said image-forming unit comprising a first frame on which the photosensitive material drum and the means for electric charging are mounted, and a second frame on which the means for developing is mounted, the second frame including a toner container,
• the means for electric charging is a scorotron charger which is located with .+-.45.degree. from a perpendicular downwardly drawn from a center of the photosensitive material drum and has a hole on the side opposite to an opening for charging;
• the first frame and the second frame have a common fulcrum and are connected each other with a resiliently engaging means on the side opposite to the fulcrum;
• and
• an electric field E.sub.1 between a wire and a grid in the scorotron charger is set to be stronger than an electric filed E.sub.2 between the wire and a shield.

An image-forming apparatus for forming an image comprising means for electric charging of a photosensitive material drum, means for exposure to light, means for developing and a transfer member for transferring a toner image formed on the photosensitive material drum to a transfer paper, wherein

• the means for developing which after developing also works to clean off toner remaining on the photosensitive material drum;
• the means for electric charging has a scorotron charger located within .+-.45.degree. from a perpendicular downwardly drawn from a center of the photosensitive material drum, said charger including an opening disposed in proximity to and opposite the photosensitive material drum for charging the photosensitive material drum, a grid disposed across said opening and a wire disposed below said grid and contained in said charger and shielded by a shield surrounding said wire, said charger further including an air ventilation hole on the side opposite to the opening for charging for removal of ozone and NOx developed during charging;
• and
• an electric field E.sub.1 between the wire and the grid in said scorotron charger is set to be stronger than an electric field E.sub.2 between the wire and the shield;
• and
• the photosensitive material drum rotates a plurality of times in order to form the image on one transfer paper.