An image forming apparatus includes a paper feeding cassette, a first conveying unit, a lift mechanism, a motor, a second conveying unit, and a control unit. The controller drives the motor and, if a value indicating a movement amount of the tray moving from when the lift mechanism starts the lifting of the tray until when a position of the top part reaches a first position is a first value, matches a position of the first conveying unit, which comes into contact with the top part to thereby rise together with the tray, with a second position and, if the value indicating the movement amount is a second value larger than the first value, matches the position of the first conveying unit, which comes into contact with the top part to thereby rise together with the tray, with a third position lower than the second position.

A feed detection unit which detects a document which is fed is provided at a position between a pinching position at which a feed roller and a frictional force application portion pinch the document and an intersecting position at which a tangential line of the feed roller which is closer to a downstream side in a transport direction than the pinching position is perpendicular to a transport path in the transport direction, which is a different position from the feed roller in a width direction which intersects the transport direction.

A sheet conveying apparatus includes a stacking unit, a feeding member, a conveyance guide, and a movement unit. The stacking unit is drawably mounted on an apparatus body and includes a stacking member on which a sheet is stacked. The feeding member feeds the sheet stacked on the stacking member. The conveyance guide is provided with an opening and disposed above the stacking unit. The conveyance guide configures a conveyance path through which the sheet is conveyed. The movement unit moves the feeding member between a first position on which the feeding member comes into contact with the sheet stacked on the stacking member and a second position disposed above the first position. The movement unit includes an entry portion configured to be located within the opening in a state where the feeding member is positioned at the second position.

A medium feeder includes a feed roller that feeds a medium loaded on a medium loading section; a transport roller disposed downstream relative to the feed roller; a first driving source that drives at least the feed roller; a second driving source that drives at least the transport roller; and a housing that houses the feed roller, the transport roller, the first driving source, and the second driving source, wherein the housing includes a lower unit that constitutes a lower part of the housing, and an upper unit openable relative to the lower unit, and the first driving source and the second driving source are disposed on both sides relative to a center part of the lower unit in a width direction perpendicular to a medium transportation direction.

A conveyance apparatus includes a separation unit configured to separate and convey a sheet, a detection unit configured to detect a height-direction deformation of the sheet passing through the separation unit on a downstream side than a sheet-conveying position of the separation unit in a conveyance direction of the sheet, and a control unit configured to stop the sheet conveyed by the separation unit if the detection unit detects the deformation of the sheet.

A groove has a first side surface and a second side surface. The second side surface faces the first side surface and is located downstream of the first side surface in a first direction. The first side surface has a first contact surface configured to contact one side surface of a protrusion. The second side surface having a second contact surface and a guide surface. The second contact surface is smaller than the first contact surface. The second contact surface is configured to contact an other side surface of the protrusion. The guide surface is inclined away from the first contact surface in a direction from a tip-side end of the second contact surface toward a tip end of a drive shaft. The tip-side end is an end facing toward the tip end of the drive shaft. The guide surface is configured to guide the protrusion to the groove.

A sheet conveyance apparatus includes a drive transmission mechanism configured to transmit a driving force from a driving source to a rotary conveyance member. The drive transmission mechanism includes a shaft, a first rotary member supported on the shaft and configured to rotate by being driven by the driving source, a second rotary member supported on the shaft and configured to rotate the rotary conveyance member, a drive transmission member provided movably in an axial direction of the shaft, and configured to transmit the driving force between the first rotary member and the second rotary member, and a moving unit configured to move the drive transmission member to a transmission position and a release position. The drive transmission member engages the first and second rotary members with each other at the transmission position, and releases engagement of the first and second rotary members at the release position.

An image forming apparatus includes a feeder unit, a separating unit, a conveying unit disposed downstream of the separating unit in a sheet feeding direction, an image forming unit disposed downstream of the conveying unit in the sheet feeding direction, a drive unit, and a control unit. The feeder unit feeds a sheet. The separating unit separates sheets fed by the feeder unit one by one. The conveying unit conveys the sheet. The image forming unit forms, while the sheet is being conveyed, an image on the sheet. The drive unit drives the conveying unit. The control unit controls the drive unit. After the conveyed sheet reaches the image forming unit, the control unit reduces a conveyance speed of the sheet conveyed by the conveying unit.

A sheet feeder including a tray, a feeder roller, a guide, a separator, a motor, a controller, and a sensor, is provided. The sheet feeder separates an object sheet from other sheets in the tray and feed the object sheet through the guide and the separator by rotation of the feeder roller. The controller determines a remaining volume of the sheets in the tray based on a signal from the sensor; generate a velocity profile so that the object sheet is fed at a lower velocity in an earlier first period than a velocity in a later second period; based on the determined remaining volume of the plurality of sheets, modify at least one of a length of the first period and the target velocity in the first period of the velocity profile; and after modification of the velocity profile, control the motor in compliance with the modified velocity profile.

Embodiments provide methods, apparatuses, and systems for compressing media in a media stack. In various embodiments, a paddle moves between various positions. During the move, the paddle is configured to compress the media stack.