Sheet conveying device and image forming system therewith

A sheet conveying device, comprising:

• a sheet conveying passage through which a sheet passes;
• an upper conveying guide that faces an upper surface of the sheet passing through the sheet conveying passage;
• a lower conveying guide that faces a lower surface of the sheet passing through the sheet conveying passage;
• and
• a conveying member that conveys the sheet along the sheet conveying passage;
• a sheet stack tray that is arranged above the upper conveying guide and on which the sheet is stacked,
• wherein
• the upper conveying guide is swingable up and down, with one end of the upper conveying guide in a sheet conveying direction or one end of the upper conveying guide in a sheet width direction perpendicular to the sheet conveying direction serving as a pivot shaft, and
• the sheet stack tray has a movable part that makes contact with the upper conveying guide at least when the upper conveying guide swings, the movable part being movable between
• a sheet receiving position Where the movable part forms a sheet stack surface on which the sheet is stacked and
• a retracted position where the movable part has swung upward from the sheet receiving position.