Sheet finisher and image forming system using the same

A sheet steering device located at a position where a plurality of paths branch away for selecting one of said plurality of paths, said sheet steering device comprising:

• first means for guiding a sheet spaced from a conveyor roller, which conveys a sheet or a sheet stack, by a preselected distance and angularly movable to be displaced at different positions along a surface of said conveyor roller;
• means for selectively moving said first guide member to a first position assigned to a first path or a second position assigned to a second path;
• and
• second means for guiding a sheet, when said first means for guiding is located at said second position, the sheet or the sheet stack to a gap between an upstream portion of said first means for guiding in a direction of sheet conveyance and the surface of said conveyor roller or unblock, when said first means for guiding member is located at said first position, a path contiguous with said first path.

An image forming apparatus, comprising:

• a sheet steering device located at a position where a plurality of paths branch away for selecting one of said plurality of paths, said sheet steering device comprising:
• a first guide member spaced from a conveyor roller via a space that is present when no sheet is being steered, which conveys a sheet or a sheet stack through the space, by a preselected distance and angularly movable to be displaced at different positions along a surface of said conveyor roller;
• a drive to selectively move said first guide member to a first position assigned to a first path or a second position assigned to a second path;
• and
• a second guide member configured to guide, when said first guide member is located at said second position, the sheet or the sheet stack to a gap between an upstream portion of said first guide member in a direction of sheet conveyance and the surface of said conveyor roller or unblock, when said first guide member is located at said first position, a path contiguous with said first path.