Sheet conveying apparatus and image forming apparatus

A sheet conveying apparatus comprising:

• a first pair of conveying rollers which conveys a sheet;
• a second pair of conveying rollers against which a leading edge of the sheet conveyed by the first pair of conveying rollers is abutted so that a loop is formed on the sheet, the second pair of conveying rollers conveying the sheet together with the first pair of conveying rollers by rotating after the loop is formed on the sheet;
• a separating portion which separates the first pair of conveying rollers from each other;
• a first conveyance path which guides the sheet toward the first pair of conveying rollers;
• a second conveyance path which is a path different from the first conveyance path and guides the sheet toward the first pair of conveying rollers;
• and
• a controller which changes a separation timing at which the first pair of conveying rollers is separated after the loop is formed on the sheet, depending on whether the sheet is guided by the first conveyance path or by the second conveyance path.