A developing cartridge includes: a developing roller rotatable about a first axis extending in a first direction; a developing roller gear rotatable together with the developing roller; a coupling gear rotatable about a second axis extending in the first direction; and a joint rotatable together with the coupling gear. The coupling gear is meshingly engaging with the developing roller gear. The joint is pivotally movable relative to the coupling gear about a third axis extending in a second direction. The joint includes: a first protrusion extending in a first radial direction; and a second protrusion extending in a second radial direction opposite to the first radial direction. The second protrusion is positioned away from and is aligned with the first protrusion in a diametrical direction including the first radial direction and the second radial direction. The second direction crosses the first radial direction and the second radial direction.

An universal joint configured to transfer rotational movement from a first shaft to a second shaft at an angle and method of manufacturing the same.

An x-joint configured to transfer rotational movement from a first shaft to a second shaft at an angle and method of manufacturing the same.

A constant-velocity joint can have three pieces: a yoke, a first adaptor, and a second adaptor. Grooves on opposite sides of the yoke can receive forks of the adaptors and be perpendicular to one another. The yoke can have a guide surface within each groove so that a matching following surface on the fork of the adaptor can engage the guide surface to guide the movement of the fork within the groove. The adaptors may pivot within the grooves such that surfaces of flanks of the forks remain engaged or provide a consistent amount of surface contact with flanks of the groove throughout the pivot of the forks. Torque can be transferred through the engaged flanks as the joint is used to convert eccentric rotation to concentric rotation.

A drum cylinder unit includes a photoconductive drum and a flange member. The flange member includes a fixing portion fixed to an end of the photoconductive drum, a cylindrical portion which forms a hollow portion therein, a groove portion provided at an edge of the cylindrical portion, and a gear portion. The groove portion and the hollow portion open to an outside of an axial direction of the photoconductive drum.

The present disclosure provides a process cartridge detachably mountable to an electrophotographic image forming device. The process cartridge includes a housing, a coupling component provided at one end of the housing for receiving rotational driving force from a driving head inside the electrophotographic image forming device, and a limiting protrusion provided at the other end of the housing. The limiting protrusion abuts a lateral wall in the electrophotographic image forming device when the process cartridge is installed into the electrophotographic image forming device, and a guiding surface is provided at the limiting protrusion. Further, the guiding surface abuts the lateral wall in the electrophotographic image forming device, and a rotational axis of the coupling component inclines with respect to a rotational axis of the driving head when the process cartridge is detached from the electrophotographic image forming device.

The present invention relates to a rotational force driving assembly and a process cartridge used for being engaged with a rotational force driving head inside an electrophotographic image forming device. The rotational force driving assembly can comprise a hub, a rotational force receiving component, a side plate, and an axis offset adjusting mechanism. When the axis offset adjusting mechanism is not subjected to external force, the axis offset adjusting mechanism enables the axis of the rotational force receiving component to be parallel and offset to the axis of the hub. When the axis offset adjusting mechanism is subjected to external force, the rotational force receiving component extends out to be engaged with the rotational force driving head.

An elastic junction device for the dynamic connection, in a rolling mill, between the motor side and the head of an adapter or between the adapter and one or more rolling rolls comprises a central body which can be connected to an end of said flange so that it can rotate integrally therewith. The device additionally comprises two skids through a connecting pin so that said block rotates integrally with said flange, said skids being mechanically couplable to said adapter to allow the rotation thereof upon the rotation of said flange and vice versa. The junction device comprises at least a first damper element and at least a second damper element housed in the block and which act on opposite parts of the connecting pin so as to absorb the axial tensions which are transmitted along the adapter as a result of the stresses caused by rolling.

A drive tool has a tubular drive shaft extending along a first axis with a first end of the shaft defining a connector element including a part-spherical cavity. A second end of the shaft has a drive element. The connector element has walls surrounding the part-spherical cavity, and a pair of slots extending along the walls of the connector element between an outer surface of the connector element and the cavity. A drive element extends along a second axis having a driver tool at a first end and a part-spherical head at a second end, the head pivotally mount in the part-spherical cavity in the connector element. A pair of deflectable arms which engage the part-spherical head are mounted adjacent the cavity of the tubular drive shaft and are deflectable through the slots onto the part-spherical head.