Abstract: A sheet feeding device includes a feeding roller pair, a detecting portion, a first changing portion, a second changing portion, and a controller for controlling the first changing portion and the second changing portion. The controller starts a first feeding operation for feeding a sheet toward the obliquely feeding roller pair in a nipping state of the feeding roller pair and then starts a second feeding operation for feeding the sheet for abutting a side end of the sheet against the reference member in the nipping state of the obliquely feeding roller pair. The controller changes, after the first feeding operation is started and before the second feeding operation is started, a start timing of the second feeding operation on the basis of a detection result of a position of the side end of the sheet detected by the detecting portion.

Abstract: A sheet feeding device includes a first feeding roller pair, an upstream feeding roller pair, a downstream feeding roller pair, a second feeding roller pair, a first detecting portion, a second detecting portion, a third detecting portion, and a controller. The controller calculates a sheet feeding speed on the basis of a first time and a first distance. The controller calculates a length of the sheet with respect to the sheet feeding direction on the basis of the sheet feeding speed, a second time, and a second distance. The controller controls a sheet feeding timing by the second feeding roller pair on the basis of information of the length of the sheet.

Abstract: An identification apparatus includes a guide member defining a guide path, a scanning portion that scans the sheet inserted in the guide path, a first detection portion disposed upstream of the scanning portion in an insertion direction of the sheet in the guide path that detects presence/absence of the sheet, and a second detection portion disposed downstream of the scanning portion in the insertion direction in the guide path and detects presence/absence of the sheet. The identification apparatus is configured to start measurement of a surface property of the sheet by the scanning portion in response to a change in a detection result of one of the first detection portion or the second detection portion, and complete the measurement in response to a change in a detection result whichever of the first detection portion or the second detection portion not used in determining the start of the measurement.

Abstract: An image forming apparatus includes an image forming unit configured to form an image on a sheet, a reversing unit configured to convey a sheet conveyed from the image forming unit in a first direction, stop the conveyance, and then convey the sheet in a second direction, which is opposite to the first direction, an image detection unit disposed to detect at least a portion of the image on the sheet stopped by the reversing unit, and a control unit configured to control the reversing unit and the image detection unit. The control unit is configured to detect the image on the sheet by the image detection unit while the sheet conveyance is stopped by the reversing unit.

Abstract: A sheet conveyance apparatus includes a conveyance roller, an abutment member including an abutment surface, an obliquely conveying roller configured to convey the sheet such that the side edge portion is moved toward the abutment surface, a sheet side-edge detection portion, and a controller. The controller is configured to control the conveyance force of the obliquely conveying roller at a first conveyance force until a predetermined time has elapsed, in an abutment operation in which the sheet is abutted against the abutment surface by the obliquely conveying roller, and control the conveyance force of the obliquely conveying roller at a second conveyance force larger than the first conveyance force if the predetermined time has elapsed and the position of the side edge portion of the sheet detected by the sheet side-edge detection portion is out of a predetermined range.

Abstract: A calculation system includes an obtaining unit and a calculation unit. The obtaining unit obtains information of a sheet. The calculation unit calculates an amount of change in length of the sheet in a conveyance direction of the sheet heated by a heating device to fix a toner image to the sheet based on the information of the sheet obtained by the obtaining unit and an elapsed time from a time when the sheet passes through the heating device.

Abstract: A sheet conveyance apparatus includes a conveyance guide configured to guide a sheet along a conveyance center line extending in a conveyance direction, a reference member including an abutment surface, a conveyance unit configured to convey the sheet while abutting a first edge of the sheet against the abutment surface, a detection unit configured to detect a first angle formed between the first edge of the sheet and a second edge adjacent to the first edge, a moving unit configured to move the reference member so as to change a second angle formed between the abutment surface and the conveyance center line, and a control unit configured to perform a movement process in which the moving unit moves the reference member such that, when the first angle is referred to as ?, the second angle becomes an absolute value of a difference 90 degrees minus ?.

Abstract: A sheet conveying apparatus including: a pair of inlet rollers; a pair of outlet rollers; a pair of movable rollers disposed between the inlet rollers and the outlet rollers; a moving unit configured to move the movable rollers; a pair of upstream rollers disposed between the inlet rollers and the movable rollers; a pair of downstream rollers disposed between the movable rollers and the outlet rollers; a first conveyance belt passed over a first inlet roller, a first outlet roller, a first movable roller, a first upstream roller, and a first downstream roller; and a second conveyance belt passed over a second inlet roller, a second outlet roller, a second movable roller, a second upstream roller, and a second downstream roller. A diameter of the pair of upstream rollers and a diameter of the pair of downstream rollers are smaller than a diameter of the pair of movable rollers.

Abstract: A sheet feeding device includes a feeding roller pair, a detecting portion, a first changing portion, a second changing portion, and a controller for controlling the first changing portion and the second changing portion. The controller starts a first feeding operation for feeding a sheet toward the obliquely feeding roller pair in a nipping state of the feeding roller pair and then starts a second feeding operation for feeding the sheet for abutting a side end of the sheet against the reference member in the nipping state of the obliquely feeding roller pair. The controller changes, after the first feeding operation is started and before the second feeding operation is started, a start timing of the second feeding operation on the basis of a detection result of a position of the side end of the sheet detected by the detecting portion.

Abstract: A sheet conveyance apparatus includes a conveyance roller, an abutment member including an abutment surface against which a side edge, in a width direction, of the sheet abuts, and configured to correct a skew of the sheet, an obliquely conveying roller configured to convey the sheet such as the side edge of the sheet is conveyed toward the abutment surface, a sheet side edge detection portion configured to detect a position of the side edge of the sheet, and a control unit configured to control that a conveyance force, in the width direction, by the obliquely conveying roller in response to a detection result of the sheet side edge detection portion becomes smaller than that in an abutment movement.

Abstract: A sheet feeding device includes a first feeding roller pair, an upstream feeding roller pair, a downstream feeding roller pair, a second feeding roller pair, a first detecting portion, a second detecting portion, a third detecting portion, and a controller. The controller calculates a sheet feeding speed on the basis of a first time and a first distance. The controller calculates a length of the sheet with respect to the sheet feeding direction on the basis of the sheet feeding speed, a second time, and a second distance. The controller controls a sheet feeding timing by the second feeding roller pair on the basis of information of the length of the sheet.

Abstract: A sheet feeding apparatus includes a sheet conveyance roller, a retard roller to contact the conveyance roller and separate sheets one by one, a drive input shaft, a retard shaft, and a joint to connect the retard shaft with the drive input shaft and transmit rotary drive force of the drive input shaft to the retard shaft. A first angle formed between a line passing through a first engagement position and the drive input shaft and a line passing through a second engagement position and the retard shaft center is within a range of 80 degrees or greater and 100 degrees or smaller, and a second angle formed between a line passing through the drive input shaft and a first pin axis and a line passing through the retard shaft and a second pin axis is within a range of 50 degrees or greater and 70 degrees or smaller.

Abstract: A sheet feeding apparatus includes a disengagement mechanism to disengage a rotary feeding member and a separation member to be apart from each other, a pressing portion to press an upper face of a sheet supported on a sheet supporting portion, and a detector to detect displacement of the sheet pressed by the pressing portion. A controller executes one mode among a plurality of modes to feed the sheet supported on the sheet supporting portion based on a detection result of the detector. In a first feed mode, a leading edge of the sheet passes a position of a separation portion with the rotary feeding member and the separation member disengaged by the disengagement mechanism. In a second feed mode, the leading edge of the sheet passes the separation portion with the rotary feeding member and the separation member engaged.

Abstract: A sheet feeding apparatus includes a conveyance roller, a drive input shaft, a joint, a first engaging portion, a first engaged portion, a second engaging portion, and a second engaged portion. When viewed in an axial direction of the joint, an angle formed by a first straight line and a second straight line is within a range of 80 degrees or greater and 100 degrees or smaller, the first straight line passing through the first engagement position and a center of rotation of the drive input shaft, the second straight line passing through the second engagement position and a center of rotation of the retard shaft.

Abstract: A sheet feeding apparatus includes a disengagement mechanism to disengage a rotary feeding member and a separation member to be apart from each other, a pressing portion to press an upper face of a sheet supported on a sheet supporting portion, and a detector to detect displacement of the sheet pressed by the pressing portion. A controller executes one mode among a plurality of modes to feed the sheet supported on the sheet supporting portion based on a detection result of the detector. In a first feed mode, a leading edge of the sheet passes a position of a separation portion with the rotary feeding member and the separation member disengaged by the disengagement mechanism. In a second feed mode, the leading edge of the sheet passes the separation portion with the rotary feeding member and the separation member engaged.