Sheet processing apparatus having first and second aligners controlled based on combination of predetermined job parameters, and image forming system having sheet process apparatus

A sheet processing apparatus comprising:

• a first aligner to push lateral edges of a sheet inward across a width direction of the sheet conveyed from an upstream side for alignment of the sheet, the width direction being orthogonal to a moving direction of the sheet;
• a second aligner to abut a front edge of the sheet conveyed from the upstream side for a predetermined period of time for alignment of the sheet;
• a first aligner driver to drive the first aligner;
• a second aligner driver to drive the second aligner;
• and
• a controller to control operations of the first aligner driver and the second aligner driver,
• wherein:
• the controller activates or inactivates the first aligner driver and the second aligner driver depending on a predetermined parameter on the conveyed sheet,
• the controller determines whether a basis weight of the conveyed sheet is higher than a predetermined weight on the basis of the predetermined parameter,
• if the basis weight of the sheet is higher than the predetermined weight, the controller activates the first aligner driver alone, and
• if the basis weight of the sheet is not higher than the predetermined weight, the controller activates both the first aligner driver and the second aligner driver.

A sheet processing apparatus comprising:

• a first aligner to push lateral edges of a sheet inward across a width direction of the sheet conveyed from an upstream side for alignment of the sheet, the width direction being orthogonal to a moving direction of the sheet;
• a second aligner to abut a front edge of the sheet conveyed from the upstream side for a predetermined period of time for alignment of the sheet;
• a collector to collect one or more sheets conveyed from the upstream side,
• a first aligner driver to drive the first aligner;
• a second aligner driver to drive the second aligner;
• and
• a controller to control operations of the first aligner driver and the second aligner driver,
• wherein:
• the controller activates or inactivates the first aligner driver and the second aligner driver depending on a predetermined parameter on the conveyed sheet,
• the first aligner aligns the one or more sheets collected in the collector,
• the second aligner aligns the one or more sheets discharged from the collector,
• the controller determines whether a single sheet is to be collected in the collector on the basis of the predetermined parameter,
• if a single sheet is to be collected in the collector, the controller determines whether a basis weight of the conveyed sheet is higher than a predetermined weight on the basis of the predetermined parameter, and (i) if the basis weight of the sheet is higher than the predetermined weight, the controller activates the first aligner driver alone, and (ii) if the basis weight of the sheet is not higher than the predetermined weight, the controller activates both the first aligner driver and the second aligner driver, and
• if two or more sheets are to be collected in the collector, the controller activates the first aligner driver alone.