A control unit performs control to make a direction of an electric field generated in a first area of an image carrier forming a transfer portion during image forming operation, relative to a voltage applied to a brush member in a state where the first area passes through a contact portion, different from a direction of an electric field generated in a second area of the image carrier forming the contact portion, relative to the voltage applied to the brush member during a period when operation is shifted from first operation in which the image carrier is rotated at a first speed to second operation in which the image carrier is rotated at a second speed different from the first speed, during non-image forming operation different from the image forming operation.

An image forming apparatus resets a count value retained by a counter if a cleaning sequence is executed based on an execution instruction accepted from an operator via an operation unit or when the count value for counting the number of image-formed sheets reaches a predetermined value.

An optical scanning device includes a housing that houses an optical system for generating a light ray for optical scanning, and has a dustproof glass for emitting the light ray to an outside, and a cleaning system that is assembled to the housing and cleans the dustproof glass. The cleaning system includes a cleaning member, and a holder that holds the cleaning member, and with the holder moved in a specified movement direction relative to the dustproof glass, the cleaning member cleans the dustproof glass. The cleaning member includes a cleaner member that is adapted to contact a surface of the dustproof glass, and a pressing member that has a pressing surface for pressing the cleaner member toward the dustproof glass and is formed of an elastic body. In the movement direction, a width of the cleaner member is wider than a width of the pressing surface.

Each of first and second glasses to be cleaned has a first edge and a second edge. A cleaning system has a cleaning member having a contact surface adapted to contact a surface of the glass, and first and second holders that hold the cleaning member. A drive system moves the holder so as to perform an outward cleaning moving from the first edge toward the second edge and a return cleaning returning from the second edge to the first edge. At a start position of the outward cleaning, the holder is stopped so that a portion of the contact surface of the cleaning member is positioned inside the first edge, and at a start position of the return cleaning, the holder is stopped so that a portion of the contact surface is positioned inside the second edge.

A control unit performs control to make a direction of an electric field generated in a first area of an image carrier forming a transfer portion during image forming operation, relative to a voltage applied to a brush member in a state where the first area passes through a contact portion, different from a direction of an electric field generated in a second area of the image carrier forming the contact portion, relative to the voltage applied to the brush member during a period when operation is shifted from first operation in which the image carrier is rotated at a first speed to second operation in which the image carrier is rotated at a second speed different from the first speed, during non-image forming operation different from the image forming operation.

In an image forming apparatus, a cleaning blade, disposed on a downstream side of a transfer roller in a rotation direction of an image carrier, removes toner remaining on the image carrier after transfer of a toner image to an intermediate transfer member. After completion of an image forming operation, a controller causes the transfer roller to separate from the intermediate transfer member, cause the developing device to form on the image carrier a toner band to be supplied to the cleaning blade, and cause rotation of the image carrier to stop such that at least a part of the toner band formed on the image carrier stops within a section from a first position facing the transfer roller to a second position facing the cleaning blade in the rotation direction.

A cleaning rod includes a rod-like member, a slidable portion which is provided on a free end side of the rod-like member with respect to a direction in which the cleaning rod is inserted and which is slidable on a light emergent surface of a lens of an image forming apparatus, and a restricting portion configured to restrict movement of the slidable portion in a direction away from the light emergent surface with respect to an optical axis direction by contacting the holder at each of free ends of opposing wall portions of a holder of the image forming apparatus from a side opposite from a side where a photosensitive member of the image forming apparatus is provided with respect to the optical axis direction in a state in which the slidable portion contacts the light emergent surface.

A foreign substance collection apparatus includes: a frame body; a photosensitive drum; a cleaning roller which collects foreign substances from a surface of the photosensitive drum; a collecting roller which further collects the foreign substances having been collected by the cleaning roller from the cleaning roller; and a scraping member which scrapes off the foreign substances from the collecting roller. A foreign substance collecting portion included in the frame body has, in a posture during use: a first inner bottom surface which is positioned below the scraping member in a gravity direction; an outer bottom surface which is positioned further below the first inner bottom surface; and a connecting surface which intersects the first inner bottom surface and the outer bottom surface and which connects the first inner bottom surface and the outer bottom surface with each other.

An image forming apparatus includes a density sensing portion, a cleaning portion, and a control portion. The density sensing portion includes a substrate and a sensor package and outputs a sensing value related to a toner density of a toner image formed on an outer circumferential surface of an image carrier. The control portion performs control so that, when the cleaning portion performs cleaning of a sensing surface, a brush is moved to a cleaning position where the brush contacts the sensing surface. The control portion also performs control so that, when the cleaning portion does not perform the cleaning of the sensing surface, the brush is moved to a retracted position where the brush does not contact the sensor package and the substrate.

In an example of the disclosure, a print apparatus component to be cleaned is rotated about a rotational axis. A cleaning element having a cleaning surface in contact with the print apparatus component is rotated. The cleaning element is oscillated in a direction parallel to the rotational axis. Rotation and oscillation of the cleaning element are varied according to a predetermined function to remove a residue from the print apparatus component.