An image forming apparatus has a main body, a belt unit configured to accommodate a belt, a belt cleaning member and an accommodating unit. The belt cleaning unit is configured to remove waste toner adhered on the belt. The accommodating unit is configured to accommodate the toner removed by the belt cleaning unit. The apparatus further includes a drum unit having a drum cleaning member, and a waste toner conveying mechanism configured to convey the waste toner to the collecting unit. The conveying mechanism has a drum-side conveying unit configured to be connected with the drum cleaning member. Communication between the drum-side conveying unit and the collecting unit is enabled in association with movement of the drum unit from the outside position to the inside position, and disabled in association with movement of the drum unit from the inside position to the outside position.

An image forming apparatus has a main body, a belt unit configured to accommodate a belt, a belt cleaning member and an accommodating unit. The belt cleaning unit is configured to remove waste toner adhered on the belt. The accommodating unit is configured to accommodate the toner removed by the belt cleaning unit. The apparatus further includes a drum unit having a drum cleaning member, and a waste toner conveying mechanism configured to convey the waste toner to the collecting unit. The conveying mechanism has a drum-side conveying unit configured to be connected with the drum cleaning member. Communication between the drum-side conveying unit and the collecting unit is enabled in association with movement of the drum unit from the outside position to the inside position, and disabled in association with movement of the drum unit from the inside position to the outside position.

An image forming apparatus includes a photosensitive member having first and second areas at different positions at an axial end of the photosensitive member, the first and second areas not overlapping an image area in an axial direction of the photosensitive member; a detecting unit that detects an image; and a forming unit that forms a transfer-object image in the image area, the transfer-object image being transferred to a transfer area of continuous-form paper, the forming unit further forming first and second images in the first and second areas of the photosensitive member, respectively, the first image not being transferred to the transfer area but being detected by the detecting unit for use in an operation of controlling conditions for image formation, the second image not being transferred to the transfer area and not being used in the operation of controlling the conditions for image formation.

An image forming apparatus includes a photosensitive member having first and second areas at different positions at an axial end of the photosensitive member, the first and second areas not overlapping an image area in an axial direction of the photosensitive member; a detecting unit that detects an image; and a forming unit that forms a transfer-object image in the image area, the transfer-object image being transferred to a transfer area of continuous-form paper, the forming unit further forming first and second images in the first and second areas of the photosensitive member, respectively, the first image not being transferred to the transfer area but being detected by the detecting unit for use in an operation of controlling conditions for image formation, the second image not being transferred to the transfer area and not being used in the operation of controlling the conditions for image formation.

An image forming device includes: first and second photosensitive drums; first and second drum cleaners for removing waste developer on the first and second photosensitive drums respectively; first developer cartridge having a first waste developer chamber; a second developer cartridge having a second waste developer chamber; a belt in contact with the first and second photosensitive drums; a belt cleaner for removing waste developer on the belt; a belt waste developer conveyer for conveying the waste developer removed by the belt cleaner; a first conveyer for conveying the waste developer removed by the first drum cleaner; a second conveyer for conveying the waste developer removed by the second drum cleaner to the second waste developer chamber; and a third conveyer for conveying the waste developer conveyed by the first conveyer and the waste developer conveyed by the belt waste developer conveyer to the first waste developer chamber.

An image forming apparatus has a main body, a belt unit configured to accommodate a belt, a belt cleaning member and an accommodating unit. The belt cleaning unit is configured to remove waste toner adhered on the belt. The accommodating unit is configured to accommodate the toner removed by the belt cleaning unit. The apparatus further includes a drum unit having a drum cleaning member, and a waste toner conveying mechanism configured to convey the waste toner to the collecting unit. The conveying mechanism has a drum-side conveying unit configured to be connected with the drum cleaning member. Communication between the drum-side conveying unit and the collecting unit is enabled in association with movement of the drum unit from the outside position to the inside position, and disabled in association with movement of the drum unit from the inside position to the outside position.

An image forming apparatus has a main body, a belt unit configured to accommodate a belt, a belt cleaning member and an accommodating unit. The belt cleaning unit is configured to remove waste toner adhered on the belt. The accommodating unit is configured to accommodate the toner removed by the belt cleaning unit. The apparatus further includes a drum unit having a drum cleaning member, and a waste toner conveying mechanism configured to convey the waste toner to the collecting unit. The conveying mechanism has a drum-side conveying unit configured to be connected with the drum cleaning member. Communication between the drum-side conveying unit and the collecting unit is enabled in association with movement of the drum unit from the outside position to the inside position, and disabled in association with movement of the drum unit from the inside position to the outside position.

An image forming apparatus is provided. The image forming apparatus includes an image forming device to form images of color toners on corresponding image bearers of at least four image bearers; a transferring device to transfer the color toner images on the image bearers to a transfer medium; and a controller to control the image forming apparatus. The controller performs a compulsory toner consumption processing for the color toners to compulsory consume deteriorated toners. When the compulsory toner consumption processing is performed on three or more toners, compulsory consumption toner images of the color toners are formed on the corresponding image bearers and then transferred to the transfer medium to form a compulsory consumption combined toner image including at least two overlaid image portions, wherein the at least two overlaid image portions are arranged side by side with a space therebetween in a width direction of the transfer medium.