Abstract: The present invention provides an image forming apparatus which has a developer container for containing developer, the container being detachably mountable to a main assembly of the image forming apparatus, developer amount detecting device for detecting an amount of the developer contained in the developer container, and determining device for determining the amount of the developer in accordance with a maximum value of a detected amount of the developer amount detecting device.

Abstract: A charging device includes a charging rotary member provided in contact with an image bearing member capable of bearing a toner for charging the image bearing member, in which a peripheral speed of the charging rotary member is different from a peripheral speed of the image bearing member, and the charging rotary member includes a surface layer frictionally charging the toner to a normal charging polarity.

Abstract: A developing apparatus in which a developer is prevented from attaching to a developer electrifying member. The developing apparatus has a developer carrying body, a regulating member, and a developer carrying member, wherein during a period when developing action is not conducted by the developer carrying body and residual developer is being cleaned, there is a first period during which a first electric field is formed in a direction in which the developer normally charged moves from the developer carrying body to the developer charging member and after the first period there is a second period during which a second electric field is formed in a direction in which the developer normally charged moves from the developer charging member to the developer carrying body.

Abstract: The present invention provides an image forming apparatus that has a plurality of image forming stations for forming an image on a recording material, each of the plurality of image forming stations having a memory, and writing device for writing data into the memories, wherein when the image is formed on the recording material without at least one of the image forming stations being used, the writing device writes use data into the memory of the station used and the memory of the station not used.

Abstract: An image forming apparatus or a cartridge detachably attachable to the image forming apparatus is provided, wherein the apparatus comprises developer container for containing developer, developer amount detecting means for detecting an amount of the developer contained in the developer container, a memory for memorizing information concerning the amount of the developer detected by the detecting means and output means for outputting the information concerning the amount of the developer, and the output means outputs the information concerning the developer memorized in the memory until the detection result of the detecting means is confirmed.

Abstract: In a developing apparatus having the configuration of charging toner on the developing roller with the toner charging roller, toner charging roller contacts to the developing roller. Since toner adheres onto the toner charging roller by applying the voltage higher than a starting voltage in the developing apparatus, electrifying property of the toner charging roller drops. This causes low image quality since stable charges cannot be given to the toner on the developing roller. Therefore, they are provided, a developing apparatus and an image forming apparatus that can always offer good image quality by preventing adhesion of a developing material to a developer-charging member and always giving stable charges to a developer bearing body and developer.

Abstract: An image forming apparatus including image forming means for forming an image on a recording material, wherein at least a part of the image forming means is in the form of a unit which is detachably mountable to a main assembly of the apparatus, said apparatus includes memory, wherein said memory is mounted to said unit, wherein said memory stores information relating to timing at which a driving parameter of said image forming means.

Abstract: An image forming apparatus including image forming means for forming an image on a recording material, wherein at least a part of the image forming means is in the form of a unit which is detachably mountable to a main assembly of the apparatus, said apparatus includes memory, wherein said memory is mounted to said unit, wherein said memory stores information relating to timing at which a driving parameter of said image forming means.

Abstract: The present invention provides an image forming apparatus that has a plurality of image forming stations for forming an image on a recording material, each of the plurality of image forming stations having a memory, and writing device for writing data into the memories, wherein when the image is formed on the recording material without at least one of the image forming stations being used, the writing device writes use data into the memory of the station used and the memory of the station not used.

Abstract: The present invention provides an image forming apparatus comprising a developer container for containing developer, a developer amount detecting device for detecting an amount of the developer contained in the developer container, and a calculating device for calculating a display level of a remaining amount of the developer, and wherein at least the developer container is detachably mountable on a main body of an image forming apparatus as a unit, and further wherein the calculating device calculates the display level on the basis of a detection amount of the developer amount detecting device and predetermined information regarding a developer remaining amount in the container upon generation of a white void image.

Abstract: An object of the present Invention is to provide an image forming apparatus that has a cartridge detachably mounted thereon, having unitized as one piece one or more of a photosensitive body on which an electrostatic latent image is formed, charging device for charging the photosensitive body, and developing device for developing the electrostatic latent image formed on the photosensitive body and including a storage medium capable of storing electronic information, exposing device for exposing the photosensitive body, and device for detecting a used amount of the cartridge, wherein the storage medium has information stored in advance for determining an exposure condition specific to each cartridge and has an area for writing a used amount information of the cartridge detected by the detecting device, and performs control for changing the exposure condition of the photosensitive body based on the information for determining the exposure conditions and the used amount information.

Abstract: An object of the present invention is to provide a developing apparatus which can obtain a stable toner charging amount even if a developer charging member is contaminated by toner and reduce reversal fog to reduce toner consumption, and which has a developer carrying body for carrying a developer to a developing position, and a developer charging member contacted with the developer to charge the developer, wherein the developer includes toner and conductive particle.

Abstract: A simultaneous developing/cleaning device includes a developer carrying member for carrying a layer of developer, the developer carrying member forming a developing zone where the layer of the developer is contacted to the developer carrying member and to an image bearing member carrying a latent image; and a charge application member for applying electric charge to the developer carried on the developer carrying member by electric discharge, the charge application member being provided upstream of the developing zone with respect to a moving direction of the developer carrying member.

Abstract: A developing apparatus has a developer carrying body carrying a developer thereon, and a layer thickness regulating member for regulating the layer thickness of the developer carried on the developer carrying body. The developer carried on the developer carrying body contacting with an image bearing body after the layer thickness thereof has been regulated by the layer thickness regulating member. In the developing apparatus, when the charge amount per 1 g of the developer after the layer thickness has been regulated by the layer thickness regulating member and before the developer contacts with the image bearing body is defined as Q (&mgr;C/g) and the electrical resistance per axial length 1 mm of the developer carrying body is defined as R (&OHgr;/mm), R≧0.9×(−7.83×104|Q|+7.05×106) and R≦1.1×(−7.83×104|Q|+7.05×106) are satisfied.

Abstract: An object of the present invention is to provide a developing apparatus in which a developer is prevented from attaching to a developer electrifying member. Another object of the present invention is to provide a developing apparatus that has a developer carrying body, a regulating member, and a developer carrying member, wherein in a period when an developing action is not conducted by the developer carrying body, a period that after a first electric field is formed in a direction in which the developer normally charged moves from the developer carrying body to the developer charging member, a second electric field is formed in a direction in which the developer normally charged moves from the developer charging member to the developer carrying body is provided.

Abstract: The present invention provides an image forming apparatus that has a plurality of image forming stations for forming an image on a recording material, each of the plurality of image forming stations having a memory, and writing device for writing data into the memories, wherein when the image is formed on the recording material without at least one of the image forming stations being used, the writing device writes use data into the memory of the station used and the memory of the station not used.

Abstract: A use situation reporting system reports the use situations of a developer and the other consumables included in an image forming apparatus for forming images on a recording material. More particularly, the use situation reporting system reports an amount of remaining developer and the use times of consumables to a user. Thus, the timing of replacing a cartridge with a new one can be concisely reported to the user.