Abstract: A cartridge for containing a roll of photosensitive sheet and to be mounted inside an image formation apparatus is comprised of a box for containing a roll of unused photosensitive sheet and a shaft which is unistructurally formed with the box and serves to wrap up the used part of the photosensitive sheet. The shaft has adhesive sections such that the photosensitive sheet to be wrapped therearound can be securely attached thereonto.

Abstract: An image formation apparatus has a detachably attached cartridge having a box for containing a roll of unused photosensitive sheet and a take-up shaft which is unistructurally formed with the box and serves to wrap up the used part of the photosensitive sheet. Holding plates which serve to guide the used part of the photosensitive sheet towards the take-up shaft are pressed against the take-up shaft automatically when a cover for the cartridge is opened.

Abstract: A cartridge unit for use in an image forming apparatus, in which a separating unit including a separating tape normally comparatively easily soiled by toner, is provided as one unit together with a photoreceptor drum, corona charger and cleaner unit in the cartridge unit, whereby cleaning of the separating parts at the site of the user is made unnecessary so as to achieve a maintenance-free operation.

Abstract: An image forming cartridge houses a charger unit integrally with respect to a photoreceptor.Charge wire positioning members are provided on the image forming cartridge body at positions corresponding to holes provided in the charger unit aligned with the charge wire in the charger unit. The charge wire positioning members are spaced at a specified distance from the photoreceptor to ensure uniform charging of the photoreceptor by the charge wire.

Abstract: A full waste toner container detector system which includes a waste toner container for storing waste toner collected from a photoreceptor surface, a flexible film member which projects into the container when the container is not filled up with waste toner and projects outwardly from the container due to the waste toner pressure when the container is full of waste toner, a reflection plate mounted on the external surface of the flexible member, a light source for irradiating the reflection plate, and a sensor provided in such a position as to receive light reflected by the reflection plate when the flexible member projects outwardly from the container.

Abstract: A photoreceptor cartridge unit having a cartridge frame made of plastic on which a photoreceptor drum acting as a rotary member and its peripheral components are integrally mounted. The cartridge frame is formed with a plurality of bearing portions for supporting the rotary members and a plurality of positioning projections and is split, at the bearing portions, into two frame portions provided with an engageable portion and a receiver portion, respectively. The peripheral components are formed with a plurality of positioning holes so as to be mounted on the cartridge frame through engagement of the positioning projections with the positioning holes. The two frame portions are coupled with each other through engagement of the engageable portion with the receiver portion.

Abstract: A detector mechanism for detecting the condition when a waste toner container is full of waste toner. A piston is provided which moves in response to the waste toner pressure in the waste toner container, a shutter is provided in the path of light irradiating the photoreceptor so as to close or open the light path, and a wire is provided which is connected between the piston and the shutter and forces the shutter to move in the direction for closing the light path according to the piston movement when the toner container is full of waste toner.

Abstract: A hand-held printer such as an electronic numbering machine includes a plurality of type carrying belts or a plurality of type wheels. A drive system is associated with the type carrying belts or the type wheels to rotate the type carrying belts (type wheels) in a forward direction. A type selection system is provided for each type carrying belt (type wheel) for stopping the rotation of the type carrying belt (type wheel) when a desired type reaches a preselected position suited for the following type impact operation. After completion of the type selection operation, the type carrying belts (type wheels) are driven to swing in a predetermined direction, whereby the selected types make contact with a print receiving paper. After completion of the type impact operation, the type carrying belts (type wheels) are driven to swing in the counter direction and to rotate in a reverse direction for returning the printer to the initial stand-by condition.