Folding apparatus and image forming system incorporating the same

A folding apparatus comprising:

• a folding device configured to fold a sheet bundle;
• an additional folding device including,
• a pressure roller disposed downstream from the folding device in a sheet conveyance direction and configured to rotate along the sheet conveyance direction to press the sheet bundle after the folding device folds the sheet bundle, and
• a sheet support member disposed opposite the pressure roller via the sheet bundle;
• a conveyer configured to convey the sheet bundle to a position at which the additional folding device presses the sheet bundle and hold the sheet bundle at the position;
• a moving device configured to move the additional folding device;
• and
• control circuitry configured to cause:
• the additional folding device to perform additional folding processing at a first position on the sheet bundle,
• the moving device to move the additional folding device to a second position different from the first position, and
• the additional folding device to perform the additional folding processing at the second position on the sheet bundle.

A folding apparatus comprising:

• a folding device configured to fold a sheet bundle;
• an additional folding device including,
• a pressure roller disposed downstream from the folding device in a sheet conveyance direction and configured to rotate along the sheet conveyance direction to press the sheet bundle after the folding device folds the sheet bundle, and
• a sheet support member disposed opposite the pressure roller via the sheet bundle;
• a conveyer configured to convey the sheet bundle to a position at which the additional folding device presses the sheet bundle and hold the sheet bundle at the position;
• a moving device configured to move the additional folding device;
• and
• control circuitry configured to,
• set a number of times of an additional folding processing based on at least one of a number of sheets in the sheet bundle and a thickness of a sheet in the sheet bundle, and
• perform the additional folding processing the number of times by instructing the conveyer to move the sheet bundle to different positions the number of times, and performing the additional folding processing at each of the different positions on the sheet bundle before moving the sheet bundle to a next one of the different positions.