A photoconductive drum for an electrophotographic image forming device according to one example embodiment includes a cylindrical drum member. A shaft defines a rotational axis of the photoconductive drum. An end cap is positioned at an axial end of the drum member. An electrical contact is positioned against an axially inboard side of the end cap. The electrical contact electrically connects the shaft to the drum member. The electrical contact includes a plurality of projections that contact an inner circumferential surface of the drum member. A plurality of grooves are formed in an outer circumferential surface of the end cap.

An image forming apparatus includes first and second image forming portions provided with first and second image bearing member, respectively. A controller controls a first operation in which the image to be transferred to the recording material is formed only in the first image forming portion, a second operation in which the image to be transferred is formed in the first and second image forming portions, and a supplying operation in which a lubricant is attached to the second image bearing member and supplied to a contacting portion of the second image bearing member. In a case that stopping time exceeds a predetermined threshold when a start instruction of the first operation is input in a stopping state of the first and second image bearing members, the controller controls to execute the supplying operation during from a current start instruction of the first operation is input until a next start instruction of the first or second operation is input.

An image forming apparatus that is capable of executing image forming operation includes an image bearing member; a developer carrying member that faces the image bearing member in a state of keeping a predetermined gap therefrom, and develops a latent image on the image bearing member using developer; a frame that supports the developer carrying member; applying units that applies developing voltage, in which DC voltage and AC voltage are superimposed, to the developer carrying member; a conductive member that is disposed in the frame; a detecting unit that detects AC current induced in the conductive member by applying the developing voltage to the developer carrying member; and a control portion that controls the applying units. The control portion controls the developing voltage in the image forming operation, based on the AC current which the detecting unit detects in a case where the voltage is applied by the applying units.

An image forming device, including: a housing; a drawer movable between an inside position at which the drawer is located inside the housing and an outside position at which the drawer is located outside the housing; a drum cartridge including a photoconductive drum and a developer roller and mountable on the drawer; a toner cartridge storing toner to be supplied to the developer roller and mountable on the drawer, wherein the drawer includes a first guide that guides the toner cartridge in mounting the toner cartridge on the drawer, and wherein the drum cartridge includes a second guide connected to the first guide in a state in which the drum cartridge is mounted on the drawer, the second guide being configured to guide the toner cartridge in mounting the toner cartridge on the drawer in the state in which the drum cartridge is mounted on the drawer.

A method of authenticating a consumable or detachable element of a continuous inkjet printer comprising: the controller of the printer generating a 1.sup.st item of random information that is dispatched to an authentication circuit of the element; encrypting the 1.sup.st item of information by the authentication circuit using a 1.sup.st encryption algorithm and a 1.sup.st secret key to form a 1.sup.st item of encrypted random information; dispatching the 1.sup.st item of information to the controller; encrypting the 1.sup.st item of information by the controller using a 2.sup.nd encryption algorithm and a 2.sup.nd secret key to form a 2.sup.nd item of encrypted random information; comparing the 1.sup.st item of encrypted random information with the 2.sup.nd encrypted item of random information to authenticate the consumable element; and if the consumable element is authenticated, dispatching at least one part of a 3.sup.rd key, termed the shared key, by the element to the printer.

There are demands for stable connections of contact points between a process cartridge, including a development device, and an image forming device. A development contact point, a first contact point, and a second contact point are disposed in this order on the inside in a perpendicular direction with respect to an insertion direction in which a development device is inserted into an image forming apparatus.

An input device that is mountable on an image forming apparatus includes a plurality of numerical keys arranged as hardware keys, a connector provided in a casing of the input device and configured to electrically connect the image forming apparatus and the input device, and a USB port provided in the casing and configured to USB-connect external equipment, which is different from the image forming apparatus, to the input device. As viewed in an up-down direction that the numerical keys are pressed, the USB port is provided on a front side surface of the casing.

An overturning prevention device includes a holding member disposed at a bottom surface portion of an apparatus, and an overturning prevention member configured to be held by the holding member. The apparatus includes a wheel unit including a wheel, a fitting portion, and a support shaft. The holding member is disposed at a position nearer to a center of the bottom surface portion than the support shaft when viewed from above. The overturning prevention member includes, a projecting portion configured to project outside the bottom surface portion, and a held portion configured to be held by the holding member, the projecting portion and the held portion being connected with each other. The overturning prevention member is configured to be attached to and detached from the holding member by being moved in an attaching direction in which the held portion and the projecting portion are connected.

An image forming apparatus includes a photosensitive drum, a developing device configured to supply toner onto the photosensitive drum, a transfer device configured to transfer the toner supplied onto the photosensitive drum onto a sheet, a spraying device configured to spray a fixing liquid toward the sheet onto which the toner has been transferred, the spraying device including a housing configured to accommodate the fixing liquid and nozzles configured to spray the fixing liquid inside the housing, and a collecting device configured to collect the fixing liquid sprayed from the nozzles and did not adhere to the sheet. The collecting device includes a collection tray configured to accommodate the fixing liquid, a collection pipe connected to the collection tray and configured to allow the fixing liquid in the collection tray to pass therethrough, and a collection pump configured to send the fixing liquid in the collection pipe toward the housing.

A cartridge includes a photosensitive drum, the movable member movable relative to the photosensitive drum to control an inclination angle of a drive transmission member. The movable member is movable between a first position for reducing an inclination angle of the drive transmission member relative to the photosensitive drum and a second position retracted from the first position. By this, driving connection can be smoothly carried out.