Sheet processing apparatus, laminator, image forming apparatus, and image forming system

A sheet processing apparatus to sandwich a sheet media in a two-ply sheet in which two sheets are overlaid and bonded together at a portion of the two-ply sheet;

• the sheet processing apparatus comprising:
• a first conveyor to convey the sheet media;
• a second conveyor to convey the two-ply sheet;
• a winding roller;
• and
• circuitry configured to control the first conveyor and the second conveyor to perform one of:
• a single insertion mode to insert the sheet media into the two-ply sheet, and
• a multiple insertion mode to insert the sheet media arranged along a conveyance direction of the sheet media into the two-ply sheet, and
• adjust a relative position of the sheet media with respect to the two-ply sheet,
• wherein the second conveyor is to convey a bonded end of the two-ply sheet downstream in a conveyance direction of the two-ply sheet,
• wherein the circuitry is configured to
• control the second conveyor to stop conveyance of the two-ply sheet at a time at which the second conveyer conveys the bonded end of the two-ply sheet from a nip of the second conveyor downstream in the conveyance direction of the two-ply sheet by a predetermined amount,
• open a sheet gripper of the winding roller and reverse rotation of the second conveyor to convey the two-ply sheet into the opened sheet gripper in a reverse conveyance direction, then
• close the sheet gripper to grip an end of the two-ply sheet, then
• rotate the winding roller in a first direction to wind the two-ply sheet around the winding roller,
• wherein the circuitry is configured to control the second conveyor to hold the two-ply sheet, and
• wherein the circuitry is configured to control the first conveyer to abut the sheet media to the nip of the second conveyor to adjust the relative position of the sheet media with respect to the two-ply sheet.

A sheet processing apparatus to sandwich a sheet media in a two-ply sheet in which two sheets are overlaid and bonded together at a portion of the two-ply sheet;

• the sheet processing apparatus comprising:
• a first conveyor to convey the sheet media;
• a second conveyor to convey the two-ply sheet;
• and
• circuitry configured to control the first conveyor and the second conveyor to perform one of:
• a single insertion mode to insert the sheet media into the two-ply sheet, and
• a multiple insertion mode to insert the sheet media arranged along a conveyance direction of the sheet media into the two-ply sheet, and
• adjust a relative position of the sheet media with respect to the two-ply sheet,
• wherein the circuitry is configured to determine whether a length of the sheet media in the conveyance direction of the sheet media is equal to or smaller than a threshold value and automatically switch to the multiple insertion mode in response to determining that the length of the sheet media in the conveyance direction of the sheet media is equal to or smaller than the threshold value.