An image forming apparatus (1) includes an image bearing member (50), a charging section (51), a developing section (52), and a cleaning member (81). The image bearing member (50) contains filler particles (87). The charging section (51) is either in contact with or positioned close to the image bearing member (50) and is configured to electrically charge the image bearing member (50) by generating a proximity discharge between the charging section (51) and the image bearing member (50). The developing section (52) supplies toner to the circumferential surface of the charged image bearing member (50). The cleaning member (81) has a degree of hardness equal to or higher than 65° and a degree of impact resilience equal to or lower than 30%. The cleaning member (81) is brought into pressure contact with the circumferential surface of the image bearing member (50) being rotated, by applying linear pressure equal to or higher than 15 gf/cm.

A cartridge attachable to and detachable from an image forming apparatus forming an image on a recording material, the cartridge includes: an image bearing member; a developer container that contains therein a developer; a developing member that is rotatable and carries the developer supplied from the developer container and supplies the developer to the image bearing member; a developer supplying member that is rotatable and provided in the developer container and in contact with the developing member to supply the developer to a surface of the developing member; and a contact member provided in the developer container and in contact with a surface of the developer supplying member, wherein the developer remaining on the image bearing member after image formation is collected to the developing member, and the developer collected to the developing member is collected into the developer container.

A cartridge attachable to and detachable from an image forming apparatus forming an image on a recording material, the cartridge includes: an image bearing member; a developer container that contains therein a developer; a developing member that is rotatable and carries the developer supplied from the developer container and supplies the developer to the image bearing member; a developer supplying member that is rotatable and provided in the developer container and in contact with the developing member to supply the developer to a surface of the developing member; and a contact member provided in the developer container and in contact with a surface of the developer supplying member, wherein the developer remaining on the image bearing member after image formation is collected to the developing member, and the developer collected to the developing member is collected into the developer container.

Provided is an image forming apparatus, including: an image bearing member; a developing device which is configured to store developer having magnetic carrier and toner and to develop an electrostatic latent image formed on the image bearing member; a discharge port which is arranged in the developing device and through which developer is discharged from the developing device; a collection portion which is configured to collect the developer discharged through the discharge port; a discharge conveyance portion which is configured to convey the developer discharged through the discharge port to the collection portion; an environment detector which is arranged in a conveyance passage of the discharge conveyance portion and is configured to detect environment information; and an adjustment portion which is configured to adjust a development condition of the developing device based on output of the environment detector.

Provided is an image forming apparatus, including: an image bearing member; a developing device which is configured to store developer having magnetic carrier and toner and to develop an electrostatic latent image formed on the image bearing member; a discharge port which is arranged in the developing device and through which developer is discharged from the developing device; a collection portion which is configured to collect the developer discharged through the discharge port; a discharge conveyance portion which is configured to convey the developer discharged through the discharge port to the collection portion; an environment detector which is arranged in a conveyance passage of the discharge conveyance portion and is configured to detect environment information; and an adjustment portion which is configured to adjust a development condition of the developing device based on output of the environment detector.

An image forming apparatus has a developing portion; a toner storing container; and a supply path capable of supplying toner to the developing portion from the toner storing container, where the toner storing container is attachably and detachably provided to the supply path, and the toner storing container has a screw-like conveying member configured to convey the toner; a discharge portion configured to discharge the toner toward the supply path; and a first cleaning member arranged at an end portion of the conveying member and configured to clean the discharge portion by scraping the toner on the discharge portion based on a rotation of the conveying member.

An image forming apparatus has a developing portion; a toner storing container; and a supply path capable of supplying toner to the developing portion from the toner storing container, where the toner storing container is attachably and detachably provided to the supply path, and the toner storing container has a screw-like conveying member configured to convey the toner; a discharge portion configured to discharge the toner toward the supply path; and a first cleaning member arranged at an end portion of the conveying member and configured to clean the discharge portion by scraping the toner on the discharge portion based on a rotation of the conveying member.

A powder detection device includes a detection unit, a cleaning unit, and a drive unit. The detection unit includes detection surfaces provided in a storage container and enables detection of powder through the detection surfaces. The cleaning unit removes the powder from the detection surfaces by sliding along the detection surfaces. The drive unit reciprocates the cleaning unit along a path extending through the detection surfaces and differentiates a speed at which the cleaning unit is moved in a first direction along the path from a speed at which the cleaning unit is moved in a second direction opposite to the first direction.

A powder detection device includes a detection unit, a cleaning unit, and a drive unit. The detection unit includes detection surfaces provided in a storage container and enables detection of powder through the detection surfaces. The cleaning unit removes the powder from the detection surfaces by sliding along the detection surfaces. The drive unit reciprocates the cleaning unit along a path extending through the detection surfaces and differentiates a speed at which the cleaning unit is moved in a first direction along the path from a speed at which the cleaning unit is moved in a second direction opposite to the first direction.

A binary ink developer assembly includes a plurality of rollers, gears, and end caps. The rollers are in contact with each other to form a nip. Each roller includes a plurality of bearings. The gears include gear teeth. A respective gear has an involute tooth profile and applies a gear force at a pressure angle corresponding to the involute tooth profile to rotate at least one roller. The end caps are coupled to the bearings. At least one slot arranged to form a slot angle substantially equal to the pressure angle and to receive a respective bearing to support a respective roller.