Post-processing apparatus, image forming system and control method

An image forming system for forming an image on a sheet, comprising a post-processing apparatus, wherein

• the post-processing apparatus comprises
• a sheet discharge tray to which a sheet or a sheet bundle is discharged;
• a shift mechanism configured to shift a discharge position of the sheet or the sheet bundle discharged to the sheet discharge tray from a reference position;
• and
• a controller configured to
• control the shift mechanism to divide the sheet or the sheet bundle in a first direction in a direction orthogonal to a conveyance direction of the sheet or the sheet bundle and a second direction opposite to the first direction,
• control the shift mechanism to shift the sheet bundle for each job of a plurality of jobs, and
• when a job includes a plurality of sheet bundles, control the shift mechanism to shift more than one bundle of the plurality of sheet bundles included in the job.

A post-processing apparatus, comprising:

• a sheet discharge tray to which a sheet or a sheet bundle is discharged;
• a shifter configured to shift a discharge position of the sheet or the sheet bundle discharged to the sheet discharge tray from a reference position;
• and
• a controller configured to
• control the shifter to change a shift amount from the reference position of the sheet or the sheet bundle as a number of the sheets or as a number of sheet bundles discharged to the sheet discharge tray increases, so as to obliquely stack the sheet or the sheet bundle as viewed from a conveyance direction of the sheet or the sheet bundle,
• control the shifter to shift the sheet bundle for each job of a plurality of jobs, and
• when a job includes a plurality of sheet bundles, control the shifter to shift more than one bundle of the plurality of sheet bundles included in the job.

An image forming system for forming an image on a sheet, comprising a post-processing apparatus, wherein

• the post-processing apparatus comprises
• a sheet discharge tray to which a sheet or a sheet bundle is discharged;
• a shifter configured to shift a discharge position of the sheet or the sheet bundle discharged to the sheet discharge tray from a reference position;
• and
• a controller configured to
• control the shifter to change a shift amount from the reference position of the sheet or the sheet bundle as a number of sheets or a number of sheet bundles discharged to the sheet discharge tray increases to obliquely stack the sheet or the sheet bundle as viewed from the conveyance direction of the sheet or the sheet bundle,
• control the shifter to shift the sheet bundle for each job of a plurality of jobs, and
• when a job includes a plurality of sheet bundles, control the shift mechanism to shift more than one bundle of the plurality of sheet bundles included in the job.

A control method by a post-processing apparatus comprising a sheet discharge tray to which a sheet or a sheet bundle is discharged, and a shift mechanism, the method comprising:

• controlling shifting, by the shift mechanism, a discharge position of the sheet or the sheet bundle discharged to the sheet discharge tray from a reference position;
• and
• controlling the shift mechanism to divide the sheet or the sheet bundle in a first direction in a direction orthogonal to a conveyance direction of the sheet or the sheet bundle and a second direction opposite to the first direction,
• controlling the shift mechanism to shift the sheet bundle for each job of a plurality of jobs, and
• when a job includes a plurality of sheet bundles, controlling the shift mechanism to shift more than one bundle of the plurality of sheet bundles included in the job.