Abstract: An attachable-detachable unit that is attachable to and detachable from a body. The unit includes a storage portion having a storage space in which powder is stored, the storage space including a bottom part that is continuous in one direction and a narrow region in which the storage space seen in the one direction has a smaller sectional area than in an other region; and a transport member extending in the one direction in the storage space and transporting the powder in the one direction such that at least some of the powder passes through the narrow region.

Abstract: An attachable-detachable unit that is attachable to and detachable from a body. The unit includes a storage portion having a storage space in which powder is stored, the storage space including a bottom part that is continuous in one direction and a narrow region in which the storage space seen in the one direction has a smaller sectional area than in an other region; and a transport member extending in the one direction in the storage space and transporting the powder in the one direction such that at least some of the powder passes through the narrow region.

Abstract: A roller unit includes: a first roller including, at one end, a shaft having a cut-out portion; a bearing that supports the shaft and forms a space for accommodating an object disposed in the cut-out portion; and a switching member including a shaft part that can be disposed in the cut-out portion, and a separating part that is continuous with the shaft part and that, when the shaft part is disposed in the cut-out portion, comes into contact with a unit including a second roller to separate the first and second roller. When the shaft part rotates with the shaft and moves from the cut-out portion to the space, the separating part comes out of contact with the unit, bringing the first roller and the second roller into a state in which the first roller and the second roller push each other.

Abstract: A roller unit includes: a first roller including, at one end, a shaft having a cut-out portion; a bearing that supports the shaft and forms a space for accommodating an object disposed in the cut-out portion; and a switching member including a shaft part that can be disposed in the cut-out portion, and a separating part that is continuous with the shaft part and that, when the shaft part is disposed in the cut-out portion, comes into contact with a unit including a second roller to separate the first and second roller. When the shaft part rotates with the shaft and moves from the cut-out portion to the space, the separating part comes out of contact with the unit, bringing the first roller and the second roller into a state in which the first roller and the second roller push each other.

Abstract: An image forming apparatus includes the following elements. A housing includes a mounting unit. A removable unit includes at least a photoconductor drum and is mounted on and dismounted from the mounting unit. An exposure device includes a light-emitting source and is fixed to the mounting unit such that the exposure device pivots about a pivot point in directions in which it approaches and separates from the photoconductor drum. The exposure device includes a driven portion at an end on an upstream side in an inserting direction of the removable unit. The driven portion is driven to move the exposure device in a direction in which it approaches the photoconductor drum. The removable unit includes a driving portion at the end on the upstream side. The driving portion contacts and drives the driven portion to move the exposure device in the direction in which the exposure device approaches the photoconductor drum.

Abstract: An image forming apparatus includes the following elements. A housing includes a mounting unit. A removable unit includes at least a photoconductor drum and is mounted on and dismounted from the mounting unit. An exposure device includes a light-emitting source and is fixed to the mounting unit such that the exposure device pivots about a pivot point in directions in which it approaches and separates from the photoconductor drum. The exposure device includes a driven portion at an end on an upstream side in an inserting direction of the removable unit. The driven portion is driven to move the exposure device in a direction in which it approaches the photoconductor drum. The removable unit includes a driving portion at the end on the upstream side. The driving portion contacts and drives the driven portion to move the exposure device in the direction in which the exposure device approaches the photoconductor drum.

Abstract: Disclosed is an image forming apparatus including an image forming apparatus member, a toner image forming unit including a housing that accommodates at least one of a toner image retainer to retain a toner image and a toner retainer to supply a toner to the toner image retainer, and a recording medium transport unit including a transport belt, having an endless shape, that is openably and closably mounted to the image forming apparatus member and transports a recording medium with being wound between a pair of support rollers provided along a transport direction of the recording medium, and a regulation member that faces the transport belt to regulate a posture of the recording medium, wherein when the recording medium transport unit is closed with respect to the image forming apparatus member, the regulation member is positioned to come into contact with the housing.

Abstract: Disclosed is an image forming apparatus including an image forming apparatus member, a toner image forming unit including a housing that accommodates at least one of a toner image retainer to retain a toner image and a toner retainer to supply a toner to the toner image retainer, and a recording medium transport unit including a transport belt, having an endless shape, that is openably and closably mounted to the image forming apparatus member and transports a recording medium with being wound between a pair of support rollers provided along a transport direction of the recording medium, and a regulation member that faces the transport belt to regulate a posture of the recording medium, wherein when the recording medium transport unit is closed with respect to the image forming apparatus member, the regulation member is positioned to come into contact with the housing.