A print medium finishing unit may include a load part in which print media is loaded, a stapler stapling the print media loaded in the load part while moving along one side end of the print media, and at least one arrangement member supporting one side end of the print media, wherein the arrangement member protrudes toward a moving path of the stapler to move between an arrangement position supporting one side end of the plurality of print media and an escape position escaping from a moving path of the stapler by receiving a force through the moving stapler. Therefore, a moving path of the stapler has a simple structure.

Provided is a power supply unit that includes a switching section and a controller. The switching section is configured to perform a switching operation and thereby generate, based on an input signal, a first alternating-current signal. The controller is configured to control the switching operation and thereby perform an amplitude control that involves increasing, based on an input current in the switching section, a signal amplitude of the first alternating-current signal.

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 image forming apparatus includes a toner image forming unit, a nip formation member, a transfer power source, an information acquisition device, and a controller. The information acquisition device acquires specific information that specifies whether a recording sheet as a transfer target of a toner image is an uneven surface sheet having an uneven surface. The controller outputs a bias including a superimposed voltage, in which an alternating current (AC) voltage is superimposed on a direct current (DC) voltage, as a transfer bias from the transfer power source when the specific information acquired by the information acquisition device is not information corresponding to the uneven surface sheet and to output a bias including only the DC voltage as the transfer bias from the transfer power source when the specific information is the information corresponding to the uneven surface sheet.

A relay conveyance device detachably mounted on an image forming apparatus body is provided with a fixing member that holds a mounting state of the relay conveyance device to the image forming apparatus body. The fixing member is provided with a relay connector that relays the image forming apparatus body and the post-processing device. The post-processing device is electrically connected to the image forming apparatus body via the relay connector.

An image forming apparatus includes an opening closing unit openably arranged between first and second positions and an associating mechanism connecting a body unit with the opening closing unit and operating in association with the opening closing unit. The associating mechanism includes plural compression springs and a buffer member, urges the opening closing unit with a first compression spring among the plural compression springs when the opening closing unit is placed at the first position, urges the opening closing unit with the first compression spring and a second compression spring when the opening closing unit is placed at a third portion between the first portion and the second position, and buffers the motion of the opening closing unit with the buffer member when the opening closing unit is placed at a fourth position between the second position and the third position.

A push type key includes a base including a main body, a key portion having an operation surface, first and second elastic portions connecting between the main body and the key portion, and an electrical equipment substrate provided on a back side of the base. The substrate includes an operating portion acted on by the key portion when the key portion moves. The first and second elastic portions have symmetrical configurations with respect to a phantom line passing through a center of the key portion, as seen perpendicularly to the operation surface. The operating portion is disposed at a position closer to the first elastic portion than to the second elastic portion. The base is provided with a third elastic portion connecting the key portion with the main body or with the second elastic portion in a side of the second elastic portion with respect to the phantom line.

An image forming apparatus includes a first image forming unit that forms a metallic-color toner image having a metallic color, a second image forming unit that forms a non-metallic-color toner image having a color different from the metallic color, and a transfer unit that transfers the toner images onto a recording material so that the non-metallic-color toner image is superimposed on an upper side of the metallic-color toner image on the recording material.

A photoconductor unit for an electrophotographic image forming device according to one example embodiment includes a housing and a photoconductive drum rotatably mounted on the housing. The photoconductive drum includes a drive coupler that is positioned to mate with a corresponding drive coupler of the image forming device to receive rotational and axial force therefrom for rotating and axially biasing the photoconductive drum when the photoconductor unit is installed in the image forming device. A wear member is positioned to receive frictional contact from a portion of the photoconductive drum in a direction of the axial bias on the photoconductive drum such that as the photoconductive drum rotates, the frictional contact on the wear member gradually wears away the wear member in the direction of the axial bias on the photoconductive drum thereby gradually shifting the photoconductive drum axially in the direction of the axial bias.

An electrophotographic photoreceptor includes a conductive substrate, an organic photosensitive layer on the conductive substrate, and an inorganic protective layer on the organic photosensitive layer. A layer that constitutes a surface of the organic photosensitive layer contains a charge transport material, a binder resin, silica particles, and a silicone compound.