Apparatus discharged sheet stacking

A sheet post-processing apparatus, comprising:

• a processing tray for stacking sheet materials discharged, said processing tray being inclined upwardly toward the downstream direction with respect to a movement direction of the sheet materials to impart returning movement to the discharged sheet materials;
• a stack tray, movable substantially vertically, for accommodating sheet materials discharged, wherein said stack tray is disposed downstream of said processing tray;
• first discharging means for discharging, in a stapling mode, the sheet materials so that the sheet materials are bridged between said processing tray and said stack tray, and for discharging, in a non-stapling mode, the sheet materials so that they are stacked on said stack tray;
• stapling means for stapling the sheet materials stacked on said processing tray;
• and
• second discharging means for discharging from said processing tray the sheet materials stapled by said stapling means when a processing mode is selected to said stack tray,
• wherein said first discharging means includes a first pair of rotatable members upstream of said processing tray and a second pair of rotatable members separable from and contactable with each other.

An image forming apparatus, comprising:

• image forming means for forming an image;
• a processing tray for stacking sheet materials discharged after image formation thereon by said image forming means;
• a stack tray, movable substantially vertically, for accommodating sheet materials discharged;
• first discharging means for discharging, in a processing mode, the sheet materials so that the sheet materials are bridged between said processing tray and said stack tray, and for discharging, in a non-processing mode, the sheet materials so that they are stacked on said stack tray;
• processing means for processing the sheet materials stacked on said processing tray;
• second discharging means for discharging from said processing tray the sheet materials processed by said processing means when a processing mode is selected to said stack tray,
• wherein said first discharging means includes a first discharging member for discharging the sheet materials to said processing tray, and a second discharging member for discharging the sheet materials to said stack tray, said second discharging member being movable between an operative position and a non-operative position.

An image forming apparatus, comprising:

• image forming means for forming an image;
• processing tray for stacking sheet materials discharged after image formation thereon by said image forming means, said processing tray being inclined upwardly toward the downstream direction with respect to a movement direction of the sheet materials to impart returning movement to the discharged sheet materials;
• a stack tray, movable substantially vertically, for accommodating sheet materials discharged, wherein said stack tray is disposed downstream of said processing tray;
• first discharging means for discharging, in a stapling mode, the sheet materials so that the sheet materials are bridged between said processing tray and said stack tray, and for discharging, in a non-stapling mode, the sheet materials so that they are stacked on said stack tray;
• stapling means for stapling the sheet materials stacked on said processing tray;
• and
• second discharging means for discharging from said processing tray the sheet materials stapled by said stapling means when a processing mode is selected to said stack tray;
• wherein said first discharging means includes a first pair of rotatable members upstream of said processing tray and a second pair of rotatable members separable from and contactable with each other.