Image forming system, image forming apparatus, and sheet processing device

An image forming system, comprising:

• an image forming apparatus to form an image on an inner sheet;
• a sheet processing device configured to perform post-processing on a two-ply sheet, in which two sheets are overlaid and partially bonded, to sandwich the inner sheet;
• the sheet processing device including:
• a sheet loader to load the two-ply sheet;
• a sheet processing path in which the two-ply sheet is to be separated to sandwich the inner sheet between separated portions of the two-ply sheet;
• and
• a sheet ejection path through which the inner sheet is to be ejected without passing through the sheet processing path;
• and
• control circuitry configured to:
• in response to an instruction of a plurality of print jobs including both a print job of one copy or N copies subjected to the post-processing and a print job not subjected to the post-processing,
• execute the print job not subjected to the post-processing during execution of an M-th copy of the print job subjected to the post-processing;
• and
• cause the inner sheet to be conveyed through the sheet ejection path,
• where N is equal to or greater than two and M satisfies a relation of 1≤M<N.

An image forming apparatus, comprising:

• an image forming device to form an image on an inner sheet;
• a sheet processing device to perform post-processing on a two-ply sheet, in which two sheets are overlaid and partially bonded, to sandwich the inner sheet,
• the sheet processing device including:
• a first conveyance path through which the two-ply sheet is to be conveyed and subjected to the post-processing;
• and
• a second conveyance path through which the inner sheet is to be conveyed without being subjected to the post-processing;
• and
• control circuitry configured to:
• in response to an instruction of a plurality of print jobs including both a print job of one copy or N copies subjected to the post-processing and a print job not subjected to the post-processing,
• execute the print job not subjected to the post-processing during execution of an M-th copy of the print job subjected to the post-processing;
• and
• cause the inner sheet to be conveyed through the second conveyance path,
• where N is equal to or greater than two and M satisfies a relation of 1≤M<N.

A sheet processing device to perform post-processing on a two-ply sheet (S), in which two sheets are overlaid and partially bonded, to sandwich the inner sheet, comprising:

• a first conveyance path through which the two-ply sheet is to be conveyed and subjected to post-processing;
• and
• a second conveyance path through which the inner sheet is to be conveyed downstream in a conveyance direction without being subjected to the post-processing;
• and
• control circuitry configured to:
• in response to an instruction of a plurality of print jobs including both a print job of one copy or N copies subjected to the post-processing and a print job not subjected to the post-processing,
• execute the print job not subjected to the post-processing during execution of an M-th copy of the print job subjected to the post-processing;
• and
• cause the inner sheet to be conveyed through the second conveyance path,
• where N is equal to or greater than two and M satisfies a relation of 1≤M<N.