Folding device with skew correction

An image forming system comprising:

• an image forming apparatus configured to form an image on a sheet;
• a sheet processing apparatus in an internal ejection section of the image forming apparatus configured to eject the sheet in a space inside the image forming apparatus, the sheet processing apparatus including:
• a sheet conveyance path extending from an entry portion, the entry portion coupled to the image forming apparatus;
• a skew correction roller pair configured to,
• contact a leading edge of the sheet conveyed in a first direction from the entry portion, and
• correct skew of the sheet when the skew correction roller pair does not rotate;
• a receiving path branched from the sheet conveyance path between the entry portion and the skew correction roller pair configured to receive the sheet;
• a plurality of conveyance rollers configured to convey the sheet;
• and
• circuitry configured to control the plurality of conveyance rollers to convey the sheet into the sheet processing apparatus and the skew correction roller pair to convey the sheet to the receiving path, after the leading edge of the sheet contacts the skew correction roller pair.

A sheet processing apparatus comprising:

• a sheet conveyance path extending from an entry portion;
• a skew correction roller pair configured to,
• contact a leading edge of a sheet conveyed in a first direction from the entry portion, and
• correct skew of the sheet when the skew correction roller pair does not rotate;
• a receiving path branched from the sheet conveyance path configured to receive the sheet;
• and
• a conveyance roller configured to convey the sheet,
• wherein the skew correction roller pair is configured to,
• convey a preceding sheet to the receiving path in a second direction opposite the first direction, and
• correct skew of a following sheet conveyed by the conveyance roller, and
• wherein the conveyance roller and the skew correction roller pair are configured to,
• overlay the following sheet on the preceding sheet conveyed to the receiving path, and
• convey the preceding sheet and the following sheet.