Abstract: An image heating apparatus includes a heater which heats an image on a recording material, which extends in a direction perpendicular to a moving direction of the recording material; a first temperature detecting member for detecting the temperature of the heater; power controlling device for controlling the power supplied to the heater, so that the temperature detected by the temperature detecting member remains constant; a second temperature detecting member which is positioned at a location apart, in the longitudinal direction of the heater, from where the first temperature detecting member is positioned; and an interrupting device for interrupting the imaging heating process in accordance with the temperature detected by the second temperature detecting member.

Abstract: There is disclosed an image heating device including a heater in which a heat generating element and electrodes to supply a current to the heat generating element are provided on a longitudinal substrate, a film adapted to be slid with the heater, and a back-up member for form a nip together with the through the film. A recording member bearing an image is pinched and conveyed and the image is heated by a heat from the heater through the film in the nip. The heater has a mark in at least an edge portion in the longitudinal direction.

Abstract: A fixing apparatus includes a movable member: a rotatable member for forming a nip with the movable member; wherein a recording material carrying an unfixed toner image is fed by the nip therethrough, and the unfixed toner image is fixed while it is being fed thereby; wherein the rotatable member comprises an electroconductive core, a low resistance layer electrically connected with the core and provided outside the core, and an insulation layer outside the low resistance layer; means for applying a bias voltage to the core of the rotatable member; an insulation member for covering an end surface of the low resistance layer of the rotatable member.

Abstract: An image forming apparatus includes an image bearing member; a charging member contactable the image bearing member to charge the image bearing member at a charging position; wherein an AC current applied to the charging member is constant-current-controlled when a region of the image bearing member which is going to be an image formation region is at the charging position, and wherein a current flowing through the charging member is detected when a region of the image bearing member which is going to be a non-image-formation region is at the charging position, and the AC current is determined on the basis of the detected current.

Abstract: The present invention provides an image forming apparatus with an image forming device for forming a developer image on a recording material, an applicator for applying developer to form an image on an image bearing member to form a developer bearing area. A length of the developer bearing area in the generatrix direction of the image bearing member is longer than a maximum image width on the image bearing member in the generatrix direction thereof.

Abstract: Disclosed is an image heating device for a fixing device in image forming apparatus. The image heating device is provided with two heaters and an image fixing roller. The image fixing roller is heated by the two heaters, one having the heat distribution in the center and the other having the heat distribution in the end portion of the fixing roller. The heaters are alternately energized so that the power requirement is maintained limited. The energization time ratio of the heaters is suitably varied according to the sheet size in order to compensate the temperature loss in the end portions when the heating is conducted in the central portion only, or to reduce the temperature rise in the end portions, encountered when narrow sheets are consecutively passed, thereby preventing various drawbacks resulting from uneven temperature distribution on the fixing roller.

Abstract: Disclosed is an image forming apparatus capable of preventing the offset phenomenon and an electrostatic adhesion jam. The surface of a photosensitive body is uniformly charged by a corona charge device, and then an image of the reflected light from an original is projected on the photosensitive body to obtain an electrostatic latent image. Subsequently, a developer develops the latent image into a visible image with toner. The visible image is, then, electrostatically transferred onto a transfer medium by a charge means. After that, static electricity in the transfer medium is removed by a separation means so as to be separated from the photosensitive body and to be sent to a fixing device.

Abstract: A fixing device includes a feed member for performing a fixing operation by grasping and feeding a supporting material supporting an undeveloped toner image. The feed member is made of a conductive base material and a surface release layer provided thereon, the surface release layer containing a conductive material. A biasing voltage is applied to the conductive base material.

Abstract: A heating apparatus includes a heater, the heater including a main resistance layer and a subordinate resistance layer branched from said main resistance layer, which extend in a direction crossing with a movement direction of a recording material and which are supplied with electric power; a selector for selecting a resistance layer for supplying electric power; and a controller for controlling an effective voltage applied to said heater in accordance with selected resistance layer.

Abstract: An image fixing apparatus includes a heater; a film movable in contact with the heater at one side thereof and in contact with a recording material at the other side thereof, wherein a visualized image on the recording material is heated and fixed by heat from the heater through the film; the heater including a heat generating layer extending in a direction crossing a movement direction of the film, for producing the heat by the application of a voltage between its longitudinal opposite ends; an electric path branched out of an image fixing part of the heat generating layer; and a selector for selecting the electric path in accordance with a size of the recording material.

Abstract: The present invention provides a cleaning apparatus comprising a cleaning rotary member arranged to be pressed against a movable image bearing member, for removing residual toner on the image bearing member. Cleaning rotary member has a first elastic layer as an outer layer, and a second elastic layer disposed inside of the first elastic layer. Second elastic layer has a volume resistance smaller than that of the first elastic layer. The present invention further provides a cleaning roller comprising a core metal, a conductive layer disposed on the core metal and an insulation layer disposed on the conductive layer.

Abstract: An image fixing apparatus in which a recording material having an unfixed image through a nip formed between rotatable rollers. At least one of the rollers is provided with a surface layer containing straight-needle like single-crytal fibers.

Abstract: A cleaning device which ensures perfect cleaning of the surface of an image bearing member by a cleaning device for cleaning toner remaining on the surface of the image bearing member and a cleaning roller disposed upstream of the cleaning device with respect to the direction of movement of the image bearing member and rotatable while being in contact with the surface of the image bearing member, the cleaning roller having an elastic outer layer of high hardness and an elastic inner layer of lower hardness than the outer layer.