Sheet conveying apparatus and image forming apparatus

An image forming apparatus comprising:

• an image forming unit;
• and
• a sheet conveying apparatus that includes:
• a conveying unit configured to convey a sheet,
• a casing including a conveying path through which the sheet passes,
• a cover configured to move between a closed position at which the conveying path is covered and an open position at which the conveying path is exposed,
• a drive source configured to drive the conveying unit,
• a drive transmission unit including a drive transmission belt and a rotatable member configured to engage with the drive transmission belt, wherein the drive transmission unit is configured to transmit a driving force of the drive source to the conveying unit via the drive transmission belt and the rotatable member,
• a tensioner configured to move between a pressing position at which the drive transmission belt is pressed and a retracted position retracted from the pressing position, and
• a moving member configured to move the tensioner from the pressing position toward the retracted position,
• wherein a magnitude of tension exerted on the drive transmission belt is lower when the tensioner is at the retracted position than when the tensioner is at the pressing position, and
• wherein the moving member moves the tensioner from the pressing position toward the retracted position in conjunction with movement of the cover from the closed position to the open position.

A sheet conveying apparatus comprising:

• a conveying unit configured to convey a sheet;
• a drive source configured to drive the conveying unit;
• a drive transmission unit including a drive transmission belt and a rotatable member configured to engage with the drive transmission belt, wherein the drive transmission unit is configured to transmit a driving force of the drive source to the conveying unit via the drive transmission belt and the rotatable member;
• a tensioner configured to move between a pressing position at which the drive transmission belt is pressed and a retracted position retracted from the pressing position;
• and
• a moving member configured to move the tensioner from the pressing position toward the retracted position,
• wherein a magnitude of tension exerted on the drive transmission belt is lower when the tensioner is at the retracted position than when the tensioner is at the pressing position, and
• wherein, when the tensioner moves from the pressing position to the retracted position, an area of contact between the drive transmission belt and the rotatable member decreases.