Abstract: A maintenance device has a maintenance unit. The maintenance unit has a blade unit to which a plurality of wiping blades are fixed, a wiper carriage to which the blade unit is attached, and a support frame that supports the wiper carriage. The wiper carriage has a stationary portion with a sliding roller, a movable portion with a positioning roller, and an elastic member. The elastic member elastically supports the movable portion relative to the stationary portion, and elastically contracts, when the maintenance unit is pressed against a plurality of recording heads by a unit ascent-descent mechanism with an excessive pressing force stronger than a predetermined pressing force, by receiving the reaction force of the excessive pressing force.

Abstract: A maintenance device has a maintenance unit. The maintenance unit has a blade unit to which a plurality of wiping blades are fixed, a wiper carriage to which the blade unit is attached, and a support frame that supports the wiper carriage. The wiper carriage has a stationary portion with a sliding roller, a movable portion with a positioning roller, and an elastic member. The elastic member elastically supports the movable portion relative to the stationary portion, and elastically contracts, when the maintenance unit is pressed against a plurality of recording heads by a unit ascent-descent mechanism with an excessive pressing force stronger than a predetermined pressing force, by receiving the reaction force of the excessive pressing force.

Abstract: An image carrying member unit is provided with an image carrying member, and a unit housing. The image carrying member includes an image carrying member main body which has an outer peripheral surface on which a photosensitive layer is formed, a flange part which is secured to both ends of the image carrying member main body, a cylindrical oil-impregnated sintered bearing which is secured to the through-hole of the flange part, a conduction member which conducts electricity between the oil-impregnated sintered bearing and the image carrying member main body, a spindle which is slidably inserted in the oil-impregnated sintered bearing and secured to the unit housing, and a contact spring which has a coiled spring part into which the spindle is inserted, and which is sandwiched in a compressed state between an end surface in the axial direction of the oil-impregnated sintered bearing and the unit housing.

Abstract: An image carrying member unit is provided with an image carrying member, and a unit housing. The image carrying member comprises an image carrying member main body which has an outer peripheral surface on which a photosensitive layer is formed, a flange part which is secured to both ends of the image carrying member main body, a cylindrical oil-impregnated sintered bearing which is secured to the through-hole of the flange part, a conduction member which conducts electricity between the oil-impregnated sintered bearing and the image carrying member main body, a spindle which is slidably inserted in the oil-impregnated sintered bearing and secured to the unit housing, and a contact spring which has a coiled spring part into which the spindle is inserted, and which is sandwiched in a compressed state between an end surface in the axial direction of the oil-impregnated sintered bearing and the unit housing.

Abstract: An image carrier unit of the present disclosure includes an image carrier, a charging device, a unit housing and a drive mechanism. The charging device is fittable to and removable from the unit housing in a direction perpendicular to its longitudinal direction, and has a charging member and a cleaning member for cleaning the charging member. The drive mechanism has a biasing member for biasing a rotating shaft of the cleaning member in a first direction extending along its axial direction, and a moving member for moving the rotating shaft of the cleaning member in a second direction opposite to the first direction. An engaging portion to engage with an engaged portion provided on the unit housing side is formed at one longitudinal end portion of the charging device, and an engagement state between the engaging portion and the engaged portion is retained by biasing force of the biasing member.

Abstract: An image forming apparatus includes an image carrier unit, a developing device, and an intermediate transfer body. The image forming apparatus body includes a positioning member having a positioning hole for inserting a positioning pin in a mounting direction and a guiding member including a guide rail portion for guiding the image carrier unit when mounting and removing the image carrier unit. The image carrier unit includes a sliding portion that slides with respect to the guide rail portion. When the image carrier unit is drawn from a mounted state where the image carrier unit is mounted to the image forming apparatus body, the sliding portion is drawn by a predetermined distance in parallel with the rotation shaft direction and then moves in a direction where the image carrier retreats from the developing device and the intermediate transfer body, along the guide rail portion.

Abstract: An image forming apparatus includes a body, a photoreceptor unit, and a developing unit. The developing unit includes a first attaching/detaching lever that moves a developing sleeve from a first position to a second position by lifting the first attaching/detaching lever. The photoreceptor unit includes a second attaching/detaching lever that moves the developing sleeve from the first position to the second position by lifting the second attaching/detaching lever. The photoreceptor unit and the developing unit move the developing sleeve to the second position by lifting the first or second attaching/detaching lever so that the photoreceptor unit and the developing unit are individually detached from the body.

Abstract: An image carrier unit of the present disclosure includes an image carrier, a charging device, a unit housing and a drive mechanism. The charging device is fittable to and removable from the unit housing in a direction perpendicular to its longitudinal direction, and has a charging member and a cleaning member for cleaning the charging member. The drive mechanism has a biasing member for biasing a rotating shaft of the cleaning member in a first direction extending along its axial direction, and a moving member for moving the rotating shaft of the cleaning member in a second direction opposite to the first direction. An engaging portion to engage with an engaged portion provided on the unit housing side is formed at one longitudinal end portion of the charging device, and an engagement state between the engaging portion and the engaged portion is retained by biasing force of the biasing member.

Abstract: An image forming apparatus includes an image carrier unit, a developing device, and an intermediate transfer body. The image forming apparatus body includes a positioning member having a positioning hole for inserting a positioning pin in a mounting direction and a guiding member including a guide rail portion for guiding the image carrier unit when mounting and removing the image carrier unit. The image carrier unit includes a sliding portion that slides with respect to the guide rail portion. When the image carrier unit is drawn from a mounted state where the image carrier unit is mounted to the image forming apparatus body, the sliding portion is drawn by a predetermined distance in parallel with the rotation shaft direction and then moves in a direction where the image carrier retreats from the developing device and the intermediate transfer body, along the guide rail portion.

Abstract: An image forming apparatus includes: a cleaning portion configured to remove toner stuck to a surface of an image carrier; a polishing roller that is rotatable while being in contact with the image carrier; a guide portion disposed with a gap having a predetermined width from an outer circumferential surface of the polishing roller, and configured to guide the removed toner to pass below the outer circumferential surface of the polishing roller; opening portions each formed in a predetermined size at a position below the lower portion of the outer circumferential surface of the polishing roller in the guide portion; and a housing including a wall surface that defines, together with an end of the guide portion in a rotation direction of the polishing roller, a falling path through which the toner falls from the end, the housing storing the cleaning portion and the polishing roller.

Abstract: An image forming apparatus includes a body, a photoreceptor unit, and a developing unit. The developing unit includes a first attaching/detaching lever that moves a developing sleeve from a first position to a second position by lifting the first attaching/detaching lever. The photoreceptor unit includes a second attaching/detaching lever that moves the developing sleeve from the first position to the second position by lifting the second attaching/detaching lever. The photoreceptor unit and the developing unit move the developing sleeve to the second position by lifting the first or second attaching/detaching lever so that the photoreceptor unit and the developing unit are individually detached from the body.

Abstract: An image forming apparatus (1) includes an image carrier unit (15) and a positioning member (30) configured to position the image carrier unit (15) to the apparatus main body (2). The image carrier unit (15) has a concentric circumference part (51L), (51R) formed on a concentric circle with a rotating shaft (9a) of the image carrier (9) and the apparatus main body (2) has an edge part (42L), (42R) facing the concentric circumference part (51L), (51R) at the attachment position. The positioning member (30) has an intervening part (37) formed with an edge side abutment face (37a) facing the edge part (42L), (42R) of the apparatus main body (2) and a unit side abutment face (37b) facing the concentric circumference part (51L), (51R) of the image carrier unit (15).

Abstract: An image forming apparatus includes: a cleaning portion configured to remove toner stuck to a surface of an image carrier; a polishing roller that is rotatable while being in contact with the image carrier; a guide portion disposed with a gap having a predetermined width from an outer circumferential surface of the polishing roller, and configured to guide the removed toner to pass below the outer circumferential surface of the polishing roller; opening portions each formed in a predetermined size at a position below the lower portion of the outer circumferential surface of the polishing roller in the guide portion; and a housing including a wall surface that defines, together with an end of the guide portion in a rotation direction of the polishing roller, a falling path through which the toner falls from the end, the housing storing the cleaning portion and the polishing roller.

Abstract: An image forming apparatus (1) includes an image carrier unit (15) and a positioning member (30) configured to position the image carrier unit (15) to the apparatus main body (2). The image carrier unit (15) has a concentric circumference part (51L), (51R) formed on a concentric circle with a rotating shaft (9a) of the image carrier (9) and the apparatus main body (2) has an edge part (42L), (42R) facing the concentric circumference part (51L), (51R) at the attachment position. The positioning member (30) has an intervening part (37) formed with an edge side abutment face (37a) facing the edge part (42L), (42R) of the apparatus main body (2) and a unit side abutment face (37b) facing the concentric circumference part (51L), (51R) of the image carrier unit (15).

Abstract: An image forming unit includes: a photoconductive drum; a charging member extending in a direction along a rotary shaft of the photoconductive drum; and a holding member holding the charging member at a frame member. While held at the frame member with the holding member in between, the charging member is arranged in parallel to the photoconductive drum in contact with a circumferential surface of the photoconductive drum with their rotary shafts in parallel. The holding member and the frame member respectively have interference-preventing-shaped parts provided at a tip part of the holding member in a direction where the holding member is attached and at a position of the frame member receiving the holding member. The interference-preventing-shaped parts are capable of first making contact with each other upon attachment of the charging member to the frame member to thereby prevent interference between the holding member and the photoconductive drum.

Abstract: An image forming unit includes: a photoconductive drum; a charging member extending in a direction along a rotary shaft of the photoconductive drum; and a holding member holding the charging member at a frame member. While held at the frame member with the holding member in between, the charging member is arranged in parallel to the photoconductive drum in contact with a circumferential surface of the photoconductive drum with their rotary shafts in parallel. The holding member and the frame member respectively have interference-preventing-shaped parts provided at a tip part of the holding member in a direction where the holding member is attached and at a position of the frame member receiving the holding member. The interference-preventing-shaped parts are capable of first making contact with each other upon attachment of the charging member to the frame member to thereby prevent interference between the holding member and the photoconductive drum.

Abstract: An image forming apparatus includes an apparatus main body, a housing, a photosensitive drum, a cleaning blade, a contact portion, and a contacted portion. The housing and drum are disposed in an internal space of the main body. The blade is a plate-shaped elastic member extending in an axial direction of a rotational axis of the drum, is supported by the housing, and contacts a circumferential surface of the drum for cleaning. The contact portion is disposed opposite the housing in the main body. The contacted portion is disposed at a center portion, in the axial direction, of the housing and is contacted by the contact portion. A position of the center portion, in the axial direction, of the housing is adjusted in a cross section intersecting the axial direction by the housing being inserted into the internal space and the contact portion coming into contact with the contacted portion.

Abstract: An image forming apparatus gas a photosensitive drum, an anti-static lamp, and a drum unit, The drum unit includes a unit main frame for holding the photosensitive drum, and a holder frame for holding the anti-static lamp, The holder frame is detachably attached to the unit main frame.

Abstract: An image forming apparatus includes an apparatus main body, a housing, a photosensitive drum, a cleaning blade, a contact portion, and a contacted portion. The housing and drum are disposed in an internal space of the main body. The blade is a plate-shaped elastic member extending in an axial direction of a rotational axis of the drum, is supported by the housing, and contacts a circumferential surface of the drum for cleaning. The contact portion is disposed opposite the housing in the main body. The contacted portion is disposed at a center portion, in the axial direction, of the housing and is contacted by the contact portion. A position of the center portion, in the axial direction, of the housing is adjusted in a cross section intersecting the axial direction by the housing being inserted into the internal space and the contact portion coming into contact with the contacted portion.

Abstract: An image forming apparatus gas a photosensitive drum, an anti-static lamp, and a drum unit, The drum unit includes a unit main frame for holding the photosensitive drum, and a holder frame for holding the anti-static lamp, The holder frame is detachably attached to the unit main frame.