Abstract: An image forming apparatus includes a main assembly; a door openable relative to the main assembly; an image bearing member for bearing a toner image; a cleaning member for removing toner remaining on the image bearing member; a transfer member for transferring the toner image onto a sheet; a fixing member for fixing the toner image, transferred by the transfer member, on the sheet; a discharging member for discharging the sheet, on which the toner image is fixed by the fixing member, from the main assembly. The sheet remaining in the main assembly without being discharged by the discharging member is capable of being removed from a space formed by opening the door. The image forming apparatus further includes a spacer unit capable of moving the cleaning member toward and away from the image bearing member.

Abstract: An image forming apparatus includes a removable body that is removably set in a main body of the image forming apparatus, and an engaging mechanism that causes the removable body and the main body to engage with each other when the removable body is lifted by a user.

Abstract: A printing method and apparatus, the method and apparatus including inputting a print job, printing the print job, selecting an output mode in which sheets of the print job are either reversed or not reversed before being output to a stacking unit. When printing is performed based on a second print job subsequent to printing performed based on a first print job, the second print job is output in the same output mode as that of the first print job.

Abstract: A sheet feeding device includes an inner guide member and an outer guide member that define a sheet feeding path therebetween. The sheet feeding device also includes an engaging member positioned adjacent to one of the inner guide member and the outer guide member, and a receiving portion positioned at the other one of the inner guide member and the outer guide member. The engaging member moves between an engaged position to engage the receiving portion and a disengaged position to disengage from the receiving portion. The inner guide member is selectively connected to the outer guide member via the engaging member and the receiving portion. When the engaging member contacts the sheet in the sheet feeding path, the engaging member is in the disengaged position, and when the engaging member is separated from the sheet in the sheet feeding path, the engaging member is in the engaged position.

Abstract: An image forming apparatus that includes at least one process cartridge having a photosensitive element, a development unit, a toner storage unit, a driven shaft and a driven gear mounted thereon and which is detachably attachable to the apparatus from a top front side thereof, a drive shaft, a drive gear mounted on the drive shaft to couple with and drive the driven gear to transmit a driving force to the process cartridge, an upper cover opening and closing with respect to the apparatus, a front cover opening and closing with respect to the apparatus, and at least one block component to block coupling of the drive gear and the driven gear by contacting the driven shaft while interlocked with opening and closing of the upper cover. The process cartridge is detachably attachable to the apparatus from the front top side thereof by opening and closing the upper cover.

Abstract: An image forming apparatus is provided with an apparatus main body, a cover member openably and closably mounted on the apparatus main body, and an engaging portion. The cover member includes an outer cover and an inner cover which are independently opened and closed, and the inner cover is positioned by being pushed by the outer cover when the cover member is closed. The engaging portion is provided in the apparatus main body for temporarily holding the inner cover in the apparatus main body.

Abstract: An image forming apparatus includes an image forming unit, a sheet conveyor and a main body that houses the image forming unit and the sheet conveyor. An operating unit is mounted to a front cover that can move between a closed position to cover an anterior side of the main body and an open position to expose a part of the main body. A retention mechanism retains the front cover at the closed position. The retention mechanism has a lock and a release. The lock is supported by one of the apparatus main body and the front cover and is selectively engageable with and detachable from the other. The release releases engagement of the lock, and is installed posterior to the operating unit in a region facing a back surface as viewed from an opening and closing direction of the front cover.

Abstract: A printing system comprises a paper path architecture for parallel printing using multiple marking engines. The media path configuration enables all the media feed trays to be located in one place, relative to the marking engines. A cross-over module is located between marking engines. The cross-over module can interleave media sheets that are being transported away from a first marking engine with the sheets being transported to the second marking engine. The cross-over module also includes a straight through path that enables media sheets to be transported directly to a finishing device without going through either marking engine. The marking engines include internal duplex loops such that media can be supplied to each engine in alternate groups. A merge module selectively merges the media which can then be further processed in a finishing transition module prior to communication to a finishing device.

Abstract: An image forming apparatus includes a transfer belt that conveys a transfer material, and a photosensitive body that catches the transfer material between the photosensitive body and the transfer belt and that transfers a toner image to the transfer material. The transfer belt is driven in conjunction with the opening action of the front cover, and the photosensitive body is separated from the transfer belt in conjunction with the opening action of the front cover.

Abstract: An image forming apparatus capable of easily performing exchange in a process cartridge with a new cartridge and performing removal of a jammed sheet without detachment of a drawer from a casing. The drawer detachably holds a plurality of process cartridges, and is movable in frontward/rearward direction to one of an operable position where each photosensitive drum is in direct confrontation with a conveyer belt, a cartridge exchangeable position where all of the cartridges are positioned out of the casing, and a jammed sheet processing position ahead of the cartridge exchangeable position for removing a jammed sheet. A regulation mechanism is provided for selectively regulating the movement of the drawer dependent on detachment of a rearmost process cartridge from the drawer.

Abstract: An image-forming device includes: a plurality of components that cooperate to form an image on a recording medium; and a housing that accommodates the components therein. The housing has a side wall unit. The side wall unit includes: a resin frame defining, on its one side, an opened accommodating space; and a first sheet metal frame that is fixed to one side of the resin frame, on which the opened accommodating space is defined, to close the accommodating space. At least one of the components is accommodated in the accommodating space enclosed by the resin frame and the first sheet metal frame.

Abstract: A recording apparatus includes a recording portion for recording an image on a recording sheet; feeding means for feeding the recording sheet through the recording portion, wherein in a both-side recording operation, a sheet inclination rectifying operation in a recording sheet feeding direction is carried out when the recording is effected on a first side of the recording sheet, and the sheet inclination rectifying operation is not carried out when the recording is effected on a second side of the recording sheet.

Abstract: An image forming apparatus to remove a jammed printing medium and to prevent a transmission of fixing heat is provided. The image forming apparatus includes a fixing unit to fix a toner image into a printing medium when the toner image is transferred onto the printing medium, the fixing unit including a fixing frame on which a pair of fixing rollers are rotatably disposed, at least one discharge roller disposed on the fixing frame, and a discharge guide movable with respect to the fixing frame, and having a plurality of guide protrusions to guide the printing medium toward the discharge roller when the printing medium passes through the fixing unit. The fixing unit additionally includes a cover to cover the discharge roller and the discharge guide, and a plurality of heat dissipating ribs extending from an outer surface of the cover. The heat dissipating ribs have a height and are arranged at a gap from each other so as to prevent a user's hand from directly contacting the cover.

Abstract: An image forming device includes a body having a top, a bottom, a front and a back. In one embodiment, a plurality of horizontally-aligned imaging units, each comprising a photoconductive member, transfer toner images to an intermediate transfer mechanism located below the plurality of imaging units. A pick mechanism may pick media sheets from a media input tray and feeds the media towards the front of the body. For duplex printing, the media sheets may travel along a duplex path that extends along the front of the body. In one embodiment, an access door at the front of the body pivots between a closed position and an open position. In the open position, a user may gain access to both media paths.

Abstract: An intermediate transfer unit can be detached from a device main body through an opening that is covered by an openable and closable front cover. A sheet path is provided between the intermediate transfer unit and the front cover. A portion of a convey-guiding unit of the sheet path falls in the way when detaching the detachable intermediate transfer unit. The portion of the convey-guiding unit, which falls in the way when detaching the detachable intermediate transfer unit, is formed as a detachable convey-guiding member that is detachably attached to the device main body.

Abstract: An image forming apparatus including an image holding member, an image forming section that forms an image on the image holding member, a main frame that houses at least the image holding member and the image forming section, a cover body that is mounted to the main frame so as to be able to tilt down and includes a side cover for opening and closing a side surface of the main frame and a top cover for opening and closing a top surface of the main frame; and a unit that is mounted to and dismounted from the side cover by moving in a vertical direction between the top cover and the main frame in a state where the cover body is tilted down, is provided.

Abstract: An image forming apparatus having a feed unit, a door, an in-body sheet feed section and a disposable unit. The feed unit has a component of a sheet path for single-side printing and a component of a sheet path for double-side printing. The door has a component of the sheet path for double-side printing. The in-body sheet feed section has a component of the sheet path for single-side printing, and the disposable unit includes a part of the in-body sheet feed section. The feed unit and the door are capable of pivoting on respective pivot shafts. When the door is closed, the door, the feed unit and the in-body sheet feed section form the sheet path for single-side printing and the sheet path for double-side printing.

Abstract: An image forming apparatus includes a conveyance unit configured to convey a sheet, a first door that can make the conveyance unit accessible, a rotation shaft configured to rotatably support the first door, and a second door which is provided to the first door in an openable/closable manner, wherein the second door can make the conveyance unit near the rotation shaft accessible.

Abstract: An image forming apparatus includes an image heating member for heating a toner image formed on a recording material; a pressing member for pressing said image heating member to form a nip in which the recording material is to be nipped and conveyed; contact-and-separation device for permitting contact and separation between said image heating member and said pressing member; an executing portion for executing a stand-by state in which said image heating member and said pressing member are separated with a first distance therebetween and said image forming apparatus is ready for input of an image forming signal; a recording material detecting means for detecting the recording material present in the nip when an image forming operation is stopped; and a contact-and-separation device control portion for controlling an operation of said contact-and-separation device so that said image heating member and said pressing member are separated with a second distance therebetween larger than the first distance at least

Abstract: An image forming apparatus has an image bearing member and a main body with an internal conveyance path for conveying a transfer material. An opening/closing member is attached to the main body and is displaceable between a closed position and an opened position where the conveyance path is exposed. A cover is set to cover a part of the image bearing member facing the conveyance path when the opening/closing member is open and is retracted from the conveyance path when the opening/closing member is closed. A moving mechanism slides the cover. Front and rear frames are held movably by the moving mechanism and are attached respectively to front and rear edges of the cover in a sliding direction. A tension applying mechanism acts on the frames to apply tension to the cover in the sliding direction during a sliding movement of the cover.

Abstract: An image forming apparatus includes: an image forming apparatus body; an openable member that is supported movably between an opening position and a closing position; a positioning portion that is provided in the image forming apparatus body; a positioned portion that is supported on the openable member and that is brought into contact with the positioning portion to be positioned when the openable member is in the closing position; a rotary member that is supported on the image forming apparatus body; and an opposed member that is supported on the openable member. When the openable member moves to the closing position, the opposed member moves in a direction crossing an opening/closing direction of the openable member and then moves in a reverse direction to the moving direction. And the opposed member is opposed to the rotary member rotatably when the openable member is in the closing position.

Abstract: When removing a sheet that is undesirably attached to a pressure belt as a result of a jam, if the sheet is pulled in the width direction of the pressure belt, the pressure belt may undesirably move in the width direction. This will make it difficult to perform a subsequent jam recovery operation properly. In order to solve this problem, a belt gripping roller can be brought into pressure contact with the pressure belt in the event of a jam, so as to prevent the pressure belt from being moved accidentally in the width direction while the jam is being cleared.

Abstract: A door opening or closing detecting device and an image forming apparatus including a shaft member which is provided to a housing slidably along one end of a door, and urged to be brought into pressure contact with a pressing member through a pressure contact member, the shaft member being slid by the pressing member which moves with the opening/closing of the door. The opening/closing of the door is detected by a detecting portion according to sliding of the shaft member, and a power supply is interrupted by a switch portion. The door opening or closing detecting apparatus and the image forming apparatus are capable of reliably detecting the opening/closing of the door and appropriately interrupting the power supply while achieving space saving and reduction in size of the apparatus.

Abstract: An apparatus of the present invention includes a first guide supported by a cover body in such a manner that the first guide can swing around a hinge with respect to the main body of the apparatus and a second guide provided on the apparatus main body. The first guide is supported in such a manner that it can move with respect to the cover body. When the cover body swings so as to open a sheet conveyance path, a site of the first guide on the side of the hinge swings with respect to the cover body in such a direction so as to separate from the second guide.

Abstract: An image forming device includes a heat member and a pressure member in pressed contact with the heat member, forming a nip part therebetween. A cover member of a main casing is movable between a first closed position for covering the heat member and a first open position for exposing the heat member. A flapper disposed between the cover member and the nip part is movable between a second closed position for covering the heat member and a second open position for exposing the heat member. The flapper toggles between conveying paths. A regulating member is capable of regulating movement of the flapper to the second open position when the cover member is in the first open position so as to maintain the heat member covered by the flapper.

Abstract: A document feeder includes a reverse transporting mechanism that forms a substantially U-shaped document transporting pathway for carrying a document from a feeding tray located at a lower side to a discharging tray located at an upper side through a reading position, a pulling device, a separating transporting device and a openable pathway cover. The pulling device and the separating-transporting device are arranged at substantially the same horizontal level within the height that is occupied by the reverse transporting mechanism. The pathway cover is capable of opening and closing to cover on the pulling device, the separating-transporting device and the reverse transporting mechanism.

Abstract: A drive transmission mechanism of a sheet transportation apparatus of the present invention comprises an upstream transportation roller gear and a planet gear for transmitting a first driving force from a driving source to the upstream transportation roller gear, and a release mechanism for preventing the upstream transportation roller gear and the planet gear from engaging with each other. The release mechanism prevents the engagement of the planet gear and the upstream transportation roller gear when the driven gear is driven to reversely rotate by a second driving force. The release mechanism prevents the engagement by moving a release member before the planet gear and the driven gear engage with each other. The release mechanism moves the release member by the driven gear being reversely rotated by the second driving force which is a driving force other than the driving source.

Abstract: A unit drawing mechanism according to the present invention includes a drawing unit, a lever, a fixture, a preventer, a linkage, and a lever holder. The drawing unit can move along a movement path between a retracted position in an apparatus and an exposed position outside the apparatus. The lever is supported pivotably on the front side of the drawing unit. The fixture locks the drawing unit in the retracted position. The preventer prevents the drawing unit from moving from the exposed position. The linkage links the lever to the fixture and the preventer. The lever holder holds the lever in a first angular position, a second angular position, and a third angular position when the drawing unit is locked by the fixture, positioned on the movement path, and prevented by the preventer from moving from the exposed position, respectively.

Abstract: Image forming apparatuses include: a casing; an image forming unit removable from the casing in a first direction; and plural developer cartridges. The cartridges may be attached and detached with respect to the image forming unit in a second direction that is inclined toward the first direction. Other image forming apparatuses include: a casing; an exposure device; a plurality of cartridges configured to be attached and detached with respect to the casing in a first direction; and a recording medium transport system for transporting recording media adjacent the photosensitive members in a second direction. The first direction may be inclined with respect to the second direction, and at least a portion of optical paths of the light emitted from the exposure device may extend parallel with the first direction. Aspects of the invention also relate to image forming units, e.g., for use in image forming apparatuses as described above.

Abstract: A printing apparatus having a scanner function. The printing apparatus includes: a printing unit to print an image according to an electro-photographic method; a scanning unit which reads image information from a document sheet, and is installed at the upper side of the printing unit to be able to pivot in upward/downward direction; and an upper cover to cover the upper side of the printing unit, wherein the upper cover is pivoted together with the scanning unit so as to open the upper side of the printing unit.

Abstract: An image forming apparatus comprising including a pressing roller to press a sheet of printing paper, further comprising: and a heating roller to press against each other with a sheet of printing paper to be transferred therebetween to rotate against the pressing roller, leaving a moving path of the sheet of printing paper therebetween, and heat the sheet of printing paper, the apparatus including a roller frame to support the heating roller; a separation claw, which, when is disposed in an operational position on an outer circumferential surface of the heating roller, to which the sheet of printing paper is discharged, and separates the sheet of printing paper from the heating roller; and a claw frame to support the separation claw, and which is detachably attached to the roller frame to makeallow the separation claw to move between the operational position and a withdrawal position, at which the separation claw is withdrawn from the operational position.

Abstract: An open jam-door sensor having a peripheral device such as a printer including a substantially C-shaped feed path, the C-shaped feed path defining an inner guide and an outer guide, the outer guide being connected to the peripheral device. A media sensor for detecting type of media in the device is disposed on one of said guide opposite a reflective portion disposed on the other of said guides. The media sensor also being used to detect when the outer guide is in an open position and causing a processor to inhibit device operations, such as printing.

Abstract: An image forming apparatus includes: an image forming apparatus main body that includes an image forming unit and a sheet conveyance unit; a unit that is at least a part of the image forming unit or the sheet conveyance unit and is openably/closably provided with respect to the image forming apparatus main body; an open-close cover that is openably/closably provided with respect to the image forming apparatus main body; a connection unit that connects the unit to the open-close cover; a connection release unit that releases connection between the unit and the open-close cover by the connection unit; a pressing unit that presses the unit in a closing direction with respect to the image forming apparatus main body; and a prohibition unit that prohibits release of connection by the connection release unit.

Abstract: A sheet processing device including a safety unit to prevent accidental operation of the sheet processing device. The sheet processing device can include a body to receive a processing unit to process a sheet of paper and a door provided at the body to be opened from or closed to the body. The sheet processing device can further include a sensing unit to sense the presence of the sheet of paper fed into the body, and a safety unit linked with the door, the safety unit being adapted to restrict the sensing unit or release the restricted sensing unit to control operation of the sheet processing device.

Abstract: A cover-body locking construction includes a specified housing, a frame insertable into and withdrawable from the housing, a structure supported on the frame, and a cover body shiftable between a covering position to cover at least part of the structure and an exposing position to expose the at least part of the structure to the outside by canceling the covered state with the structure withdrawn from the housing. The cover body includes a locking member having a locking portion for locking the cover body set at the covering position into the frame and an operating portion for causing the locking portion to lock and unlock. The housing includes a lock guiding member shaped to interlock the locking portion with the frame due to the interference with the cover body and the operating portion upon inserting the frame into the housing with the structure covered by the cover body.

Abstract: An apparatus for adjusting a fixing pressure of an image forming apparatus is provided. The apparatus for adjusting the fixing pressure includes a pair of pressing members to rotatably support an axis of a first roller from both ends and to rotate about a hinge shaft to cause the first roller to press against a second roller, a pair of hinge cams to move the hinge shaft of the pair of pressing members in either of two directions, a driving unit to rotate the pair of hinge cams, and a control unit to control the driving unit to adjust the position of the hinge shaft.

Abstract: The present invention relates to an automatic document feeder having a mechanism for releasing paper jam by disconnecting the transmission device. The automatic document feeder includes a driving motor, a transmission device, a plurality of paper transfer rollers, a swing arm and a releasing arm. The driving motor is used for providing driving power. The transmission device and is coupled to the driving motor for transmitting the driving power. The swing arm is coupled to some of the transmission elements and operated in either a connection state or a disconnection state. The releasing arm is selectively contacted with the swing arm to have the swing arm enter the disconnection state or separated from the swing arm to have the swing arm enter the connection state. The paper jam is released when the swing arm is operated in the disconnection state.

Abstract: A document processing system includes a feeder stage, a transport stage, and a retractable mechanism cooperating with a portion of the document track. An assertable member is arranged with respect to the document track such that assertion of the member causes retraction of the opposed track walls in the cooperating portion of the document track by retracting a first base member from a second base member. An imaging assembly is composed of an imaging device and an image glass. The image glass is positioned as one side of the document track at the retractable mechanism. In the retracted state, the imaging assembly is retracted to provide access to the imaging device and the document track.

Abstract: In one embodiment, the fixing apparatus of the present invention is a fixing apparatus in which while recording paper is transported sandwiched between a heating roller and a pressure roller that are pressed against each other, the recording paper is guided by a guide member, and heat and pressure are applied to the recording paper to fix toner on the recording paper, the fixing apparatus configured with the guide member rotatably provided such that the guide member can be removed from the transport path of the recording paper, and the center of rotational movement of the guide member matched with a shaft of the heating roller or a shaft of the pressure roller.

Abstract: A pullout unit including a pullout component that is provided at a main body of a device so as to be able to be pulled out from the main body of the device, and that faces a conveying route surface of the main body of the device to form a conveying route on which an object to be conveyed is conveyed, and a scraping member that is provided at the pullout component at the inner side in a pullout direction in which the pullout component is pulled out, and that scrapes the object to be conveyed on the conveying route surface when the pullout component is pulled out, is provided.

Abstract: An image forming apparatus includes: an image forming apparatus body, a photosensitive member, an intermediate transfer belt, and a developing device placed on a side opposite to the intermediate transfer belt across the photosensitive member and provided with a detachable toner cartridge. The intermediate transfer belt is disposed such that a distance between ends in a height direction is longer than a distance between ends in an anteroposterior direction. At least a part of the photosensitive member is placed between the anteroposterior ends of the intermediate transfer belt. The image forming apparatus body includes an openable section at an upper face side or a front face side thereof to allow the toner cartridge to be attached and detached therethrough and to allow a jam to be fixed therethrough.

Abstract: A gear mechanism comprises a first gear which has a portion with no teeth and rotates, a second gear which engages the first gear and a cam mechanism which includes a cam portion provided on one gear of the first gear and the second gear and a cam contact portion provided on the other gear of the first gear and the second gear and making contact with the cam portion. When the second gear moves from a position in which the second gear engages the tooth portion of the first gear to a position in which the second gear opposes the portion with no teeth of the first gear, the cam mechanism acts to bring the axes of the first gear and the second gear away from each other.

Abstract: An image forming apparatus is described as including a door member for opening and closing an opening provided in a main body member; a hinge mechanism; and a lock mechanism. The hinge mechanism may include a first hinge hole and a second hinge hole which are provided in at least one of the door member and the main body member, and are arranged substantially coaxially while being spaced from each other, a hinge shaft inserted across the first hinge hole and the second hinge hole, and a spring unit which presses the hinge shaft against inner peripheral surfaces of the first and second hinge holes. The first hinge hole may be smaller in size than the second hinge hole.

Abstract: An image forming apparatus includes a cover and a supporting unit. The supporting unit includes a holding member, a supporting member, a first biasing unit, and a positioning unit. The holding member holds the transferring member. The supporting member movably supports the holding member, so that the transferring member can move toward or away from a specific member arranged in the main body. The first biasing unit biases the transferring member toward the specific member. When the cover is in a closed state, the transferring member is pressed against the specific member. The positioning unit performs positioning of the supporting member with respect to the main body.

Abstract: In order to facilitate removal of jammed sheets in an image forming device placed at a low place, there is provided an image forming device including a main body formed with an upper opening; an image forming unit that forms images on recording medium, and an upper cover pivotably movably supported to the main body for covering the upper opening. The main body accommodates the image forming unit. The upper cover includes a discharge roller and a pinch roller pressed against the discharge roller. The discharge roller discharges the recording medium conveyed from the image forming unit outside the main body of the image forming device in cooperation with the pinch roller.

Abstract: An image forming apparatus includes: a main body; an image forming portion for forming a toner image on a recording material; a fixing unit for fixing the toner image on the recording material and including a nip forming member which forms a fixing nip that nips and conveys the recording material; a reverse roller unit for including a reverse roller, and the reverse roller rotates backward to convey the recording material to the image forming portion again after conveying the recording material which has passed through the fixing nip in a same direction as a conveying direction at the fixing nip; and a delivery roller for delivering the recording material which has passed through the fixing nip, out of the main body. The reverse roller unit is attached to the fixing unit, and is removably installable in the main body integrally with the fixing unit.

Abstract: An image forming apparatus including: an apparatus body; a first unit which can be pulled/pushed from/to the body along a first direction and which includes at least a part of an image forming section for forming an image and/or of a sheet transporting section for transporting a sheet onto which the formed image is transferred, and; a second unit which can be pulled/pushed from/to the first unit along a second direction in a state where the first unit is pulled from the body, the second direction being different from the first direction; and a housing permitting mechanism for permitting the first unit to be pushed into the body by a predetermined operation, the housing permitting mechanism being provided for at least one of the body and the first unit.

Abstract: An image processing device includes a first and second rotating member configured to selectively rotate between an open position and a closed position, and a first and second actuator configured to rotate in sync with the first rotating member and the second rotating member, respectively. The image processing device also includes a light sensor including a light emitter configured to emit a light, and a light receptor positioned opposite the light emitter. The light receptor is configured to receive the light from the light emitter, and a space is formed between the light emitter and the light receptor. In addition, the first actuator is selectively positioned within the space and outside of the space based on the position of the first rotating member, and the second actuator is selectively positioned within the space and outside of the space based on the position of the second rotating member.

Abstract: A plurality of process cartridges are provided at a device main body. The process cartridges are arranged in tandem in a vertical direction, and are each mountable/removable by being withdrawn in a horizontal direction. A transport belt is disposed near side portions of the process cartridges. The transport belt transports paper between the transport belt and each of the process cartridges. A cover covers the side portions of the process cartridges and is axially supported at the device main body, below the process cartridges, to be swingable. The cover is attached to be capable of opening and closing a process cartridge side portions side of the device main body. The belt is mounted at the cover so as to be disposed between the process cartridges and the cover, and operates integrally with the cover.

Abstract: An image forming device includes a main body and a door. The main body is provided with first and second contacting parts and an abutting surface. When the door is closed, the first and second contacting parts contact a door frame of the door, thereby determining the horizontal position of the door with respect to the main body. Also a vertical positioning stopper formed to the door frame abuts the abutting surface from above, thereby determining the vertical position of the door with respect to the main body. Further, a reactive force generated at a lock mechanism and an urging force of a spring increase a pressure to contact areas of the door with the first and second contacting parts and the abutting surface.