Abstract: An image forming system including: a conveyance unit configured to convey a first sheet on which an image has been formed by an image forming portion; a reading unit including a reading sensor configured to read the first sheet being conveyed by the conveyance unit through a transparent member at a reading position; a guide member configured to cover a reference member on a side opposite to the reading sensor with respect to the transparent member; and a controller configured to perform shading correction on a result of reading the first sheet based on image data obtained by the reading unit reading the reference member through the transparent member, and to control, based on an image subjected to the shading correction, a geometric characteristic of an image to be formed on a second sheet by the image forming portion.

Abstract: A color measurement device includes a conveying roller unit that conveys a sheet in a conveying direction, a color sensor that is movable in a direction orthogonal to the conveying direction and measures a color of an image formed on the sheet, a white reference plate having a reference surface for measurement by the color sensor for calibration of the color sensor, lifting rollers that move with the color sensor and retain the sheet, and slid-on members that protrude to a level higher than the reference surface in a perpendicular direction to the reference surface. When the color sensor moves such that at least part of the lifting rollers overlaps the white reference plate as viewed from the perpendicular direction, the lifting rollers are brought into contact with the slid-on members, whereby a space is formed between the lifting rollers and the reference surface.

Abstract: An image reading apparatus including: a conveyance path; a light transmitting member; a first reading unit; a second reading unit; a first roller disposed opposite to the first reading unit; a second roller disposed opposite to the second reading unit; a holding member configured to hold the first roller and the second roller; a plurality of first abutment portions provided on both end portion sides in a width direction of the first roller and forming a gap between the light transmitting member and the first roller by abutting on the light transmitting member; a plurality of second abutment portions provided on both end portion sides in the width direction of the second roller and forming a gap between the light transmitting member and the second roller by abutting on the light transmitting member; and an urging member urges the holding member against the light transmitting member.

Abstract: A color measurement apparatus comprising: a color measurement unit configured to perform color measurement of an image on a sheet, the color measurement unit including a light source; a reference member used for calibration of the color measurement unit; a moving unit configured to move the color measurement unit to a first position at which the light source irradiates a region other than the reference member with light and a second position at which the light source irradiates the reference member with light; and a control unit configured to, after causing the light source to emit light when the color measurement unit is positioned at the first position, and then moving the color measurement unit to the second position, execute the calibration based on data obtained by causing the light source to irradiate the reference member with light.

Abstract: An image forming system including: a reading unit configured to read, through a transparent member, an image on a first sheet conveyed by a conveyance unit; an opposed member provided opposite to the reading unit with respect to the transparent member, the first sheet passing through a gap between the opposed member and the transparent member; and at least one processor configured to control, based on the image read by the reading unit, a geometric characteristic of an image to be formed on a second sheet by an image forming portion, and control a changing unit to change the size of the gap to a first size when the thickness of the first sheet is a first thickness, and to a second size larger than the first size when the thickness of the first sheet is a second thickness larger than the first thickness.

Abstract: An image forming system including: a conveyance unit configured to convey a first sheet on which an image has been formed by an image forming portion; a reading unit including a reading sensor configured to read the first sheet being conveyed by the conveyance unit through a transparent member at a reading position; a guide member configured to cover a reference member on a side opposite to the reading sensor with respect to the transparent member; and a controller configured to perform shading correction on a result of reading the first sheet based on image data obtained by the reading unit reading the reference member through the transparent member, and to control, based on an image subjected to the shading correction, a geometric characteristic of an image to be formed on a second sheet by the image forming portion.

Abstract: An image reading apparatus includes a first conveyance roller, a second conveyance roller, a first conveyance guide, a second conveyance guide configured to move between an opposed position being opposed to the first conveyance guide and a retracting position being retracted from the opposed position, and an image reading unit opposed to the first conveyance guide and configured to move to a width direction orthogonal to the sheet conveyance direction and read an image information on a sheet. The second conveyance guide is configured to move to the retracting position in response to the image reading unit moving to the width direction and reading an image information on the sheet.

Abstract: A reading apparatus includes a feeding roller pair configured to feed a sheet supplied from another apparatus that is to be connected to the reading apparatus; a tray provided above the feeding roller pair in a vertical direction; a conveyance path through which the sheet is to be conveyed to discharge the sheet fed by the feeding roller pair to the tray; a first conveyance roller pair which is provided in the conveyance path, and is configured to convey the sheet; a second conveyance roller pair which is provided in the conveyance path on a downstream of the first conveyance roller pair in a conveying direction in which the sheet is conveyed, and is configured to convey the sheet; and a reading unit configured to read an image formed on the sheet while moving in a direction orthogonal to the conveying direction.

Abstract: A developing device includes a rotatable developer carrying member carrying a liquid developer on a carrying surface for developing an electrostatic latent image borne on an image bearing member, and an end portion restricting member, provided in contact with the developer carrying member at an end portion of the developer carrying member with respect its rotational axis direction, for restricting movement of the liquid developer in the rotational axis direction of the developer carrying member. A contact angle of the liquid developer to a side surface of the end portion restricting member on a side where the developer carrying member carries the liquid developer is larger than a contact angle of the liquid developer to the carrying surface of the developer carrying member, and the contact angle of the liquid developer to the side surface of the end portion restricting member is 45° or more.

Abstract: An image forming apparatus includes a control unit configured to execute a stop mode in which, after image forming operation is stopped, a developer bearing member is rotated for a predetermined time with a potential difference between a film forming electrode and a developer bearing member set to zero or smaller than that during image formation, and thereafter, the rotation of the developer bearing member is stopped.

Abstract: In a developer receiving portion 45, a receiving port 51 for receiving a liquid developer and a discharging port 57 for permitting discharge of the received liquid developer. A film forming electrode 44 is provided opposed to a developing roller 41 with a predetermined gap G and forms a film, on a surface of the developing roller 41, of the liquid developer supplied to the predetermined gap G through the discharging port 57. Further, the developer receiving portion 45 includes a partition plate 47 which partitions an inside space 45a, filled with the liquid developer supplied through the receiving port 51, into a first chamber 61 on the receiving port 51 side and a second chamber 62 on the discharging port 57 side. The partition plate 47 is provided with a plurality of communication ports 50 formed with respect to a liquid developer so as to communicate the first chamber 61 and the second chamber 62 with each other.

Abstract: An image forming apparatus includes a power source, a developing cartridge including a developing rotating member to carry a developer to develop an electrostatic latent image formed on an image bearing member, and a motor configured to rotationally drive the developing rotating member. A supporting frame, dismountably mounted to the image forming apparatus, dismountably supports the developing cartridge and dismountably supports the motor. In addition, an electrical contact, provided on the supporting frame, electrically contacts to the power source to supply electric power to the motor in a state that the supporting frame is mounted to the image forming apparatus, and a drawer portion dismountably supports the supporting frame and is capable of being pulled out from the image forming apparatus to dismount the supporting frame from the image forming apparatus in a state that the supporting frame is supported.

Abstract: A developing apparatus includes a developer bearing member, a developer container, and a storage tank arranged within the developer container to store liquid developer to be supplied to the developer bearing member. The storage tank includes a first bottom surface including an inclined portion that is inclined downward with respect to a horizontal direction in a rotational axis direction of the developer bearing member, and a discharge port arranged on a lower end of the inclined portion of the first bottom surface. The developer container includes a second bottom surface including an inclined portion that is inclined downward with respect to the horizontal direction toward an opposite direction as the inclined portion of the first bottom surface in the rotational axis direction of the developer bearing member, and a discharge port arranged on a lower end of the inclined portion of the second bottom surface.

Abstract: A developer container is capable of supplying a liquid developer to a portion, of a surface of a cleaning roller, between a cleaning position X and a contact position Y with respect to a rotational direction of the cleaning roller. A free end of a cleaning blade is positioned in a range of 65° or more and less than 95° as a positive angle of the rotational direction of the cleaning roller when a line passing through a center of the cleaning roller and an upper end portion of the cleaning roller with respect to a direction of gravitation is at 0° (reference line G). In this case, the cleaning blade is disposed so that an angle ? between a line F perpendicular to a line E connecting the center of the cleaning roller and the free end of the cleaning blade, and the cleaning blade is in a range of 35° or more and less than 60° .

Abstract: A developing apparatus includes a developer bearing member, a developer container configured, and a storage tank arranged within the developer container and configured to store liquid developer to be supplied to the developer bearing member. The storage tank includes a first bottom surface including an inclined portion that is inclined downward with respect to a horizontal direction in a rotational axis direction of the developer bearing member, and a discharge port arranged on a lower end of the inclined portion of the first bottom surface. The developer container includes a second bottom surface including an inclined portion that is inclined downward with respect to the horizontal direction toward an opposite direction as the inclined portion of the first bottom surface in the rotational axis direction of the developer bearing member, and a discharge port arranged on a lower end of the inclined portion of the second bottom surface.

Abstract: An image forming apparatus includes a control unit configured to execute a stop mode in which, after image forming operation is stopped, a developer bearing member is rotated for a predetermined time with a potential difference between a film forming electrode and a developer bearing member set to zero or smaller than that during image formation, and thereafter, the rotation of the developer bearing member is stopped.

Abstract: A developing device includes a developer carrying member (41) rotating while carrying a liquid developer on a carrying surface (41b) and an end portion restricting member (46) for restricting movement of the liquid developer, carried on the carrying surface (41b), to an outside of the carrying surface (41b). A contact angle between the end portion restricting member (46) and the liquid developer is set so as to be larger than a contact angle between the carrying surface (41b) of the developer carrying member (41) and the liquid developer. By this, when the developer carrying member (41) is separated from the end portion restricting member (46), deposition of the liquid developer in a large amount in the neighborhood of an end (41c) of the carrying surface (41b) is prevented.

Abstract: A developing device 50K is provided with a developing cartridge 50a and a developing frame 50b. The developing cartridge 50a includes a developing roller 54 rotatable while carrying a developer. The developing frame 50b includes a developing roller motor 206 for rotationally driving the developing roller 54 and supports the developing cartridge 50a so as to be mountable to and dismountable from the developing frame 50b. Further, the developing frame 50b is mountable to and dismountable from an apparatus main assembly. By this, a reduction in running cost and improvement in maintenance property are realized.

Abstract: A developer container 53 is capable of supplying a liquid developer to a portion, of a surface of a cleaning roller 58, between a cleaning position X and a contact position Y with respect to a rotational direction of the cleaning roller 58. A free end of a cleaning blade 56 is positioned in a range of 65° or more and less than 95° as a positive angle of the rotational direction of the cleaning roller 58 when a line passing through a center of the cleaning roller 58 and an upper end portion of the cleaning roller 58 with respect to a direction of gravitation is at 0° (reference line G). In this case, the cleaning blade 56 is disposed so that an angle ? between a line F perpendicular to a line E connecting the center of the cleaning roller 58 and the free end of the cleaning blade 56, and the cleaning blade 56 is in a range of 35° or more and less than 60°.

Abstract: An image forming apparatus includes an image forming portion configured to form an image with a liquid developer containing a toner and a carrier liquid, a separating device configured to separate the toner and the carrier liquid from the liquid developer collected at the image forming portion, a first carrier supplying device supplies a first carrier liquid separated by the separating device, and a second carrier supplying device including a second carrier container to accommodate a second carrier liquid in which a ratio of the first substance to the second substance is smaller than that in the first carrier liquid separated by the separating device or no first substance is contained. An accommodating portion accommodates the liquid developer including the first carrier liquid, the second carrier liquid, and the toner, wherein the liquid developer accommodated in the accommodating portion is supplied to the image forming portion.