Abstract: 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.

Abstract: 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.

Abstract: 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.

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 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: 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 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 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 foil transfer device includes a foil transfer unit configured to perform foil transfer processing of transferring a foil to a sheet with a toner image formed thereon, a first conveyance path configured to convey the sheet from a reception portion to the foil transfer unit and convey the sheet passed through the foil transfer unit to a discharge portion, and a second conveyance path configured to convey the sheet from the reception portion to the discharge portion without the sheet passing through the foil transfer unit.

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 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 apparatus includes an outer roller configured to form a contact portion that is in contact with an outer circumferential surface of a belt member, an inner roller configured to abut against the outer roller via the belt member, a first roller adjacent to the outer roller and the inner roller on a downstream side in a direction of movement of the belt member, and a second roller adjacent to the outer roller and the inner roller on an upstream side. At least a portion of at least one of the first and second rollers is provided on a same side as the outer roller with respect to a tangent passing an intersection of the inner roller and a straight line connecting a center of rotation of the outer roller and a center of rotation of the inner roller.

Abstract: An image forming apparatus includes an outer roller configured to form a contact portion that is in contact with an outer circumferential surface of a belt member, an inner roller configured to abut against the outer roller via the belt member, a first roller adjacent to the outer roller and the inner roller on a downstream side in a direction of movement of the belt member, and, a second roller adjacent to the outer roller and the inner roller on an upstream side. At least a portion of at least one of the first and second rollers is provided on a same side as the outer roller with respect to a tangent passing an intersection of the inner roller and a straight line connecting a center of rotation of the outer roller and a center of rotation of the inner roller.

Abstract: A sheet feeding apparatus includes an apparatus body, a feed member feeding a sheet, and a sheet storage member having first and second sheet storage portions. A sheet shifting portion pushes an upstream end of the sheet in the second sheet storage portion in a first direction so as to shift the sheet in the second sheet storage portion to the first sheet storage portion in the first direction. A driving motor generates a driving force moving the sheet shifting portion, and a moving portion moves the sheet shifting portion from a first position to a second position farther from the first sheet storage portion in a state in which the sheet shifting portion does not receive the driving force from the driving motor.

Abstract: This disclosure provides a coupling device configured to couple a shaft and a rotating member supported on the shaft so as to be rotatable and demountable from the shaft including a contacting portion provided on a rotating member, and a restricting member provided on the shaft so as to be rotatable and configured to restrict a movement of the rotating member in the axial direction by coming into contact with the contacting portion.

Abstract: This disclosure provides a coupling device configured to couple a shaft and a rotating member supported on the shaft so as to be rotatable and demountable from the shaft including a contacting portion provided on a rotating member, and a restricting member provided on the shaft so as to be rotatable and configured to restrict a movement of the rotating member in the axial direction by coming into contact with the contacting portion.

Abstract: A sheet feeding apparatus includes a stacking portion, a lifting portion, a feeding portion, and a control portion. The sheet feeding apparatus further includes a first height detecting portion configured to output a signal corresponding to a position in a height direction of the topmost sheet of sheets stacked on the stacking portion, a sheet presence detecting portion configured to output a signal corresponding to presence or absence of the sheets stacked on the stacking portion, and a second height detecting portion configured to output a signal corresponding to a position in a height direction of the stacking portion.

Abstract: A sheet feeding apparatus includes a sheet storage member, a sheet shifting portion, and a moving portion. The sheet storage member includes first and second sheet storage portions adjacent with each other. The sheet shifting portion is capable of shifting the sheet in the second sheet storage portion to the first sheet storage portion. The moving portion moves the sheet shifting portion from a first position to a second position farther than the first position with respect to the first sheet storage portion when the sheet storage member is drawn out of the apparatus body in a state in which the sheet shifting portion is located at the first position.

Abstract: A sheet stacking device includes a base member and a sheet stacking portion on which a sheet is stacked. The sheet stacking portion is supported by the base member swingably in a first direction orthogonal to a second direction, and swings and changes an inclination angle for holding the stacked sheet.