Sheet conveyance apparatus and image forming system

A sheet conveyance apparatus comprising:

• a first conveyance path for receiving a sheet;
• a reverse roller pair configured to reverse the sheet having passed through the first conveyance path;
• a second conveyance path for conveying the sheet having passed through the first conveyance path between the reverse roller pair and the first conveyance path;
• a conveyance roller pair configured to nip and convey the sheet reversed on the second conveyance path by the reverse roller pair;
• a first conveyance guide located between the reverse roller pair and the conveyance roller pair, the first conveyance guide forming the second conveyance path;
• a second conveyance guide located at a position opposing the first conveyance guide between the reverse roller pair and the conveyance roller pair, wherein the second conveyance guide forms the second conveyance path;
• and
• a holder configured to movably support the first conveyance guide,
• wherein the first conveyance guide is configured to move between a first position located at a first distance from the second conveyance guide and a second position located at a second distance greater than the first distance,
• wherein the sheet reversed by the reverse roller pair is conveyed toward the conveyance roller pair by the first conveyance guide located at the first position,
• wherein the reverse roller pair includes a first reverse roller and a second reverse roller that are configured to nip the sheet,
• wherein the first conveyance guide includes the first reverse roller, and
• wherein the first reverse roller is in contact with the second reverse roller in a case where the first conveyance guide is located at the first position, and the first reverse roller is separated from the second reverse roller in a case where the first conveyance guide is located at the second position.