Canon Kabushiki Kaisha

Yukihiro Soeta

Teppei Nagata

Tomohito Nakagawa

Shogo Terakawa

Masafumi Takahashi

Yutaka Koga

Yushi Sadamitsu

Ryohei Terada

Yasuhiro Shimoi

Masaki Uchida

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.

Image forming system

An image reading apparatus includes first and second first conveyance rollers, transparent members, reading units, and opposing rollers, and includes a driving unit. The first reading unit reads an image on a sheet first surface through the first transparent member at a first reading position. The first opposing roller is opposed to the first transparent member at the first reading position. The second reading unit reads an image on a sheet second surface through the second transparent member at a second reading position. The second opposing roller is opposed to the second transparent member at the second reading position. The second conveyance roller is arranged where a sheet trailing edge passes through the first reading position while the second conveyance roller conveys the sheet. The driving unit drives the first opposing roller so that a first opposing roller circumferential speed is faster than a second conveyance roller circumferential speed.

Image reading apparatus and image forming system

An image reading apparatus includes a conveyance unit, a casing, a reading unit, a support shaft, a first cable, and a second cable. The reading unit includes a reading sensor configured to read an image of the sheet conveyed in the conveyance path through the transparent member. The support shaft supports the reading unit in a manner of moving in a moving direction orthogonal to a longitudinal direction of the reading unit. The first cable is connected to a first connecting portion disposed in the reading unit, the first cable being held by the reading unit on one side in the longitudinal direction with respect to the support shaft. The second cable is connected to a second connecting portion disposed in the reading unit, the second cable being held by the reading unit on the other side in the longitudinal direction with respect to the support shaft.

Image reading apparatus having image reading unit supported by a support shaft and being connected to cables disposed on opposite sides of the support shaft and image forming system including the image reading apparatus

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.

Image reading apparatus and image forming system to drive backing rollers relative to outlet conveyance rollers

An image reading apparatus includes a transparent member, a conveyance unit, a reading unit reading an image information through the transparent member from the sheet conveyed by the conveyance unit, and a guide member provided upstream of a reading position where the reading unit reads the image information from the sheet with respect to a sheet conveyance direction. The guide member includes a sheet-like sheet member having elasticity. A leading end of a downstream side of the guide member in the sheet conveyance direction is a folded portion formed by folding back the sheet member.

Image reading apparatus and image forming apparatus

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.

Color measurement apparatus and image forming apparatus for executing calibration of color measurement unit

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.

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.

Color measurement device that avoids dirt on reference surface of white reference plate and image forming apparatus

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.

Reading apparatus and image forming apparatus

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 in a width direction orthogonal to the sheet conveyance direction and read 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 in the width direction and reading the image information on the sheet.

A developing device includes a rotatable developing member configured to carry a developer containing toner and a carrier to a developing position, a first frame configured to accommodate the developer, a second frame mounted on the first frame and configured to cover part of an outer peripheral surface of the rotatable developing member, and a cover portion provided opposite to the rotatable developing member. The following relationship is satisfied: LLL, and LL, where with respect to the radial direction of the rotatable developing member, Lis a minimum of the clearance formed between the second frame and the rotatable developing member, Lis a minimum of the clearance formed between the rotatable developing member and the cover portion, and Lis a minimum of the clearance formed between the second frame and the cover portion.

Developing device having spaced cover portion and frame

A developing device includes a rotatable developing member carrying a developer containing toner and a carrier to a developing position and a magnet provided fixedly inside the rotatable developing member and including first and second magnetic poles. A cover portion opposes the rotatable developing member. A most upstream end of the cover portion is positioned downstream of an uppermost position of the rotatable developing member and upstream of a most upstream position of a half-width of magnetic flux density of the first magnetic pole, and a most downstream end of the cover portion is positioned downstream of a first peak position and upstream of a position where the magnetic flux density of the first magnetic pole is a minimum on a side downstream of the first peak position and upstream of a second peak position where magnetic flux density of the second magnetic pole is a maximum.

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Kanagawa, Japan

Yukihiro Soeta