Abstract: A color electrophotographic image forming apparatus includes a main body, cartridge support, an engaging portion, and a pressure member. The support supports a plurality of cartridges and moves between a first position in the main body and a second position for mounting and detaching the cartridges. The engaging portion is provided to one of the support and the main body at a position corresponding to the second position for at least one cartridge. The pressure member is provided to the other and is elastically urged to disengageably engage the engaging portion. When the support moves from the first to the second position, a load required for movement of the support at the second position is larger than a load required for the movement at other positions than the second position, by engagement of the pressure member with the engaging portion.

Abstract: A color electrophotographic image forming apparatus including: a cartridge supporting member supporting a plurality of cartridges and moving between an inside position in the main body and a mounting and detaching position for mounting and detaching the cartridges; an engaging portion provided to one of the supporting member and the main body at a position corresponding to the mounting and detaching position for at least one cartridge; and a pressure member provided to the other and elastically urged to disengageably engage with the engaging portion, wherein when the supporting member is moved from the inside position to the mounting and detaching position, a load required for movement of the supporting member at the mounting and detaching position is made larger than a load required for the movement at other positions than the mounting and detaching position, by engagement of the pressure member with the engaging portion.

Abstract: A color electrophotographic image forming apparatus including: a cartridge supporting member supporting a plurality of cartridges and moving between an inside position in the main body and a mounting and detaching position for mounting and detaching the cartridges; an engaging portion provided to one of the supporting member and the main body at a position corresponding to the mounting and detaching position for at least one cartridge; and a pressure member provided to the other and elastically urged to disengageably engage with the engaging portion, wherein when the supporting member is moved from the inside position to the mounting and detaching position, a load required for movement of the supporting member at the mounting and detaching position is made larger than a load required for the movement at other positions than the mounting and detaching position, by engagement of the pressure member with the engaging portion.

Abstract: An electrophotographic image forming apparatus in the state that cartridge is detachably mounted to a main assembly of the apparatus, the apparatus includes a cartridge supporting member movable between an inside position in the main assembly and an outside position outside the main assembly when a cartridge is mountable thereto and dismountable from the cartridge supporting member; a first opening through which the cartridge supporting member passes between the inside position and the outside position; a first openable member for openably closing the first opening; a second opening continuing from the first opening and provided above the first opening, the second opening being effective to permit the cartridge to be removed from the cartridge supporting member in the state that cartridge supporting member takes the outside position and being effective to permit the supporting member to support the cartridge; a second openable member for openably closing the second opening, the second openable member being ef

Abstract: A compact image forming apparatus is provided in which stains on the back of a transfer material can be prevented. In particular, in a marginless print mode in which a toner image can be formed to the edge of a transfer material, a large amount of toner adheres to a transfer-material bearing member. The image forming apparatus includes a collecting member that can temporarily collect the toner adhering to the transfer-material bearing member. The toner that is temporarily collected by the collecting member is transferred to an intermediate transfer member and is cleaned by a cleaning unit.

Abstract: An image forming unit includes an image bearing member. A transfer member transfers a toner image on the image bearing member to a record member. A cleaning member cleans toner adhered onto the transfer member. A toner container contains toner cleaned by the cleaning member. A toner sensor, which is positioned at a center area of said toner container in a direction orthogonal to a moving direction of the image bearing member and detects an amount of collected toner. A conveyance member conveys the collected toner and includes first screws to convey toner to a position corresponding to an area in which the first area is excluded from the second area in a direction toward the detection position, and second screws to convey toner to a position between said first screws and the detection position in a direction opposite to the direction toward the detection position.

Abstract: Provided is an image forming apparatus in which the image forming apparatus has a marginless mode in which the toner image is formed on said image bearing member in an area that covers the recording material and an area outside the recording material, and the toner image is transferred to extend beyond an edge of the recording material carried by said recording material carrying member, the image forming apparatus further including: a detecting device which detects the toner image that extends beyond the edge of the recording material and is transferred to said recording material carrying member in the marginless mode; and a control device which uses a detection result provided by said detecting device to control where said exposure device forms a latent image on said image bearing member.

Abstract: A toner image formed on an image bearing member is transferred onto a recording material so as to overflow from an edge portion of the recording material, thereby enabling the toner image to be formed so as to extend to the edge portion of the recording material. To suppress the deposition of the toner in the edge portion of the recording material, a cleaning member for cleaning the edge portion of the recording material obtained after the fixing is provided. In order to make a trailing edge of the recording material come into contact with the cleaning member, the recording material which has passed through a fixing apparatus is temporarily switched back, thereby allowing the trailing edge portion of the recording material to collide with the cleaning member.

Abstract: The image forming unit including a bearing member and a toner detection sensor for detecting the amount of toner collects protocol from the toner detection sensor to provide an amount of toner in the cleaning unit. It prevents from compelling a user to perform excess maintenance or a leakage of toner caused by the incorrect information regarding the amount of toner because the toner on the image bearing member is biased in the longitudinal direction.