Sheet finisher and image forming system provided therewith

A sheet finisher comprising:

• (a) a stacking section having a stacking surface arranged to be tilted, and a stopper located below the stacking surface;
• (b) a sheet finishing section which post-processes on a sheet stacked on the stacking section;
• (c) a conveying section having a pair of conveyance rollers, which supplies two superimposed sheets to the pair of conveyance rollers, and supplies the sheets to the stacking section by shifting the sheets according to a difference between line speeds of respective rollers of the pair of conveyance rollers, and delivers the sheets by shifting the sheets so that the sheet on a lower side precedes toward the stopper, when the two sheets are delivered to the stacking section with the two sheets superimposed, and aligns the sheets by causing end portions of the sheets to hit the stopper;
• (d) an input section into which sheet type information for a sheet is inputted;
• and
• (e) a controller which changes a conveyance condition of the pair of conveyance rollers in accordance with the sheet type information inputted by the input section, and adjusts the shift amount between the sheets so that the sheet on the lower side precedes toward the stopper by a prescribed amount.

A sheet finisher comprising:

• (a) a stacking section having a stacking surface arranged to be tilted and a stopper located below the stacking surface;
• (b) a sheet finishing section which post-processes on a sheet stacked on the stacking section;
• (c) a conveying section having two sets of conveyance paths which join after being branched, which supplies sheets to the stacking section by superimposing two sheets by delivering a single sheet into each of the conveyance paths, and by shifting the two sheets according to a difference between line speeds of respective conveyance rollers arranged respectively in the conveyance paths, and delivers the sheet on a lower side by shifting so that the sheet on the lower side precedes toward the stopper and aligns the sheet on the lower side by causing an end portion of the sheet to hit the stopper, when the sheet is delivered under the condition that the two sheets are superimposed on the stacking section;
• (d) an input section into which sheet type information for a sheet is inputted;
• and
• (e) a controller which changes a conveyance condition of the conveyance rollers in accordance with the sheet type information inputted by the input section, and regulates a shift amount between the two sheets so that the sheet on the lower side precedes toward the stopper by a prescribed amount.

A sheet finisher comprising:

• (a) a stacking section having a stacking surface arranged to be tilted and a stopper located below the stacking surface;
• (b) a sheet finishing section which post-processes on a sheet stacked on the stacking section;
• (c) and a conveying section which delivers two sheets to the stacking section under the condition that the two sheets are shifted each other in a conveyance direction, and delivers the sheet on the lower side by shifting so that the sheet on the lower side precedes toward the stopper and aligns the sheet on the lower side by causing an end portion of the sheet to hit the stopper, when the sheet is delivered to the stacking section with the two sheets superimposed;
• (d) an input section into which a shift amount between the two sheets is inputted;
• and
• (e) a controller which changes a conveyance condition of the conveying section in accordance with the shift amount inputted into the input section, and regulates the shift amount for the two sheets so that the sheet on the lower side on the stacking side precedes toward the stopper by a prescribed amount.