Recording sheet finishing apparatus

A recording sheet finishing apparatus in use with an image forming apparatus, comprising:

• a stacker for stacking recording sheets conveyed in a conveyance direction from the image forming apparatus so as to form a bundle of said recording sheets on said stacker;
• an aligning member for aligning said bundle of said recording sheets on said stacker by said aligning member moving in a direction perpendicular to said conveyance direction;
• a stapler for stapling said bundle of said recording sheets which are aligned by said aligning member;
• a counter for counting a number of said recording sheets bundled on said stacker, and for generating a counting signal;
• and
• a control for controlling said aligning member so that:
• a) said aligning member aligns said bundle of said recording sheets a first predetermined time period after a last one of said recording sheets is aligned with other said recording sheets when said number of said recording sheets is less than a predetermined number;
• and
• b) said aligning member aligns said bundle of said recording sheets a second predetermined time period, which is longer than said first predetermined time period, after a last said recording sheet is aligned with said other recording sheets when said number of said recording sheets bundled on said stacker is not less than said predetermined number.