Sheet conveying apparatus and image forming apparatus for correcting skew of a sheet

A sheet conveying apparatus comprising:

• a first conveyance roller pair configured to convey a sheet;
• a second conveyance roller pair disposed upstream of the first conveyance roller pair and configured to convey the sheet;
• a contact portion disposed downstream of the first conveyance roller pair and configured to contact the conveyed sheet;
• a third conveyance roller pair disposed downstream of the first conveyance roller pair and configured to convey the sheet with a skew having been corrected by contacting the contact portion;
• a separation unit configured to separate the first conveyance roller pair;
• and
• a control unit configured to control a conveyance speed of the sheet conveyed by the first conveyance roller pair, a conveyance speed of the sheet conveyed by the second conveyance roller pair, and the separation unit,
• wherein the control unit forms a loop of the sheet between the first conveyance roller pair and the second conveyance roller pair, and separates the first conveyance roller pair before a leading edge of the sheet reaches the contact portion.