Image forming apparatus

An image forming apparatus comprising:

• a feeding member configured to feed a sheet;
• a separating member configured to form a nip portion with the feeding member and to separate sheets one by one at the nip portion;
• a conveying unit disposed downstream of the feeding member in a sheet feeding direction and configured to convey the sheet;
• a transfer unit disposed downstream of the conveying unit in the sheet feeding direction and configured to transfer an image formed on an image bearing member onto the sheet while the sheet is being conveyed;
• a detecting unit configured to detect the sheet conveyed by the conveying unit and is disposed downstream of the conveying unit and upstream of the transfer unit in the sheet feeding direction;
• and
• a control unit configured to control the conveying unit,
• wherein, in a case where a conveyance speed of the sheet is set, the control unit sets the conveyance speed of the sheet by the conveying unit to a second speed Vr2 slower than a first speed Vr1 in a state that a loop of the sheet is absent between the conveying unit and the feeding member,
• wherein, in a case where the sheet is to pass through the nip portion, the control unit obtains a point in time at which a trailing edge of the sheet passes through the nip portion based on a point in time at which the detecting unit detects a leading edge of the sheet and a length of the sheet in the sheet feeding direction, and
• wherein the control unit sets the conveyance speed of the sheet by the conveying unit to a third speed Vr3 faster than the first speed Vr1 after the control unit sets the conveyance speed of the sheet by the conveying unit to the second speed Vr2 and after the trailing edge of the sheet passes through the nip portion.