Systems and methods relating to accurate Channel State Information (CSI) measurements for a License Assisted Secondary Cell (LA SCell) are disclosed herein. In some embodiments, a wireless device enabled to operate in a cellular communications network according to a carrier aggregation scheme using both a licensed frequency band and an unlicensed frequency band operates to determine whether a Channel State Information Reference Symbol (CSI-RS) transmission from a LA SCell of the wireless device is present in a subframe, where the LA SCell is in an unlicensed frequency band. The wireless device further operates to process a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe and refrain from processing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe.

An image forming apparatus includes a developing device including a developing roller, a supply roller, and a conductive roller. During image formation, a bias is applied to each of the supplying roller, the developing roller, and the conductive roller in a state in which each of the supplying roller, the developing roller, and the conductive roller is rotationally driven. During the image formation, a polarity of a first potential obtained by subtracting a DC potential of the developing roller from a DC potential of the supplying roller is the same as a normal charge polarity of the toner, and a polarity of a second potential obtained by subtracting the DC potential of the developing roller from a DC potential of the conductive roller is the same as the normal charge polarity of the toner.

A developer circulated between first and second chambers in a function separation type development device including a developer discharge portion is prevented from being excessively discharged from the developer discharge portion. The developer discharge portion is disposed in the first chamber and is provided downstream of a region on a developer bearing member in the direction in which the developer in the first chamber is conveyed, the region corresponding to a maximum image region formable on an image bearing member.

A drive transmission unit is described that includes a drive source, and a rotatable drive transmitting member to transmit a driving force from the drive source. The drive transmitting member includes a bottom part intersecting an axis of the drive transmitting member, a circular transmitting part extending from the bottom part in an axial direction of the drive transmitting member and including an internal toothed surface on an inner circumferential surface of the transmitting part to mesh with a first member, and a first projecting part and a second projecting part projecting in opposite directions from the bottom part along the axial direction of the drive transmitting member and having different diameters.

A drive transmission unit is described that includes a drive source, and a rotatable drive transmitting member to transmit a driving force from the drive source. The drive transmitting member includes a bottom part intersecting an axis of the drive transmitting member, a circular transmitting part extending from the bottom part in an axial direction of the drive transmitting member and including an internal toothed surface on an inner circumferential surface of the transmitting part to mesh with a first member, and a first projecting part and a second projecting part projecting in opposite directions from the bottom part along the axial direction of the drive transmitting member and having different diameters.

A developing cartridge includes a developing roller 210d that develops, by way of a developer, an electrostatic latent image that is formed on an image bearing member 207; a developer regulating member that regulates the thickness of a developer carried on the developing roller 210d; and a frame 214a that rotatably supports the developing roller 210d and supports the developer regulating member. The frame 214a has a developing roller support section 214a1 that rotatably supports an outer peripheral face 210d6 of at least one end of the developing roller 210d. The developing roller support section 214a1 has a clearance at a position that, when viewed in the axial direction of the developing roller 210d, overlaps a contact region at which the developing roller 210d is in contact with the image bearing member 207.

A positioning member defines a facing distance between a first rotating body and a second rotating body. The positioning member includes a fitting portion, a groove, and a restricting member. A fitted portion of the first rotating body is to be rotatably fitted into the fitting portion. The groove has a groove shape extending in a predetermined direction from an opening to an abutting portion. A shaft portion of the second rotating body is to be slidably movable in the groove. The restricting member restricts movement of the shaft portion in the predetermined direction in a state in which the shaft portion abuts on the abutting portion in the groove. The restricting member is detachably disposed on the groove.

An image forming apparatus includes an image carrier, a development device and a guide part guiding the development device to the image carrier. The development device includes a magnet roller, which includes a shaft having magnets arrayed circumferentially, and a cover member, which include a bearing part engaged with the guide part as the shaft is inserted thereinto. The shaft and the bearing part include an engaged part and an engaging part restricting a circumferential position of the magnet and including contact faces provided along an action direction of force from the guide part to the bearing part when the bearing part is engaged with the guide part and the development device approaches the image carrier. A clearance is provided between an outer circumferential face of the shaft and an inner circumferential face of the bearing part at an upstream side in the action direction from the contact faces.

A developing cartridge includes a developing roller 210d that develops, by way of a developer, an electrostatic latent image that is formed on an image bearing member 207; a developer regulating member that regulates the thickness of a developer carried on the developing roller 210d; and a frame 214a that rotatably supports the developing roller 210d and supports the developer regulating member. The frame 214a has a developing roller support section 214a1 that rotatably supports an outer peripheral face 210d6 of at least one end of the developing roller 210d. The developing roller support section 214a1 has a clearance at a position that, when viewed in the axial direction of the developing roller 210d, overlaps a contact region at which the developing roller 210d is in contact with the image bearing member 207.

The present disclosure is directed to a spring bearing which is used in a roller system for a developer cartridge. The spring bearing has a front surface and a rear surface and an angled relief cut extending from the front surface to the rear surface.