Booklet conveying device, image forming system, and booklet conveying method

A booklet conveying method for a booklet conveying device comprising:

• conveying a booklet made of a stack of folded sheets by a pair of conveying units that change a distance therebetween;
• positioning the booklet by making a leading-end portion of the booklet abut thereto by a positioning unit;
• pressing the booklet positioned by the positioning unit onto one of the conveying units in order to fix by a pressing unit;
• and
• changing, by a conveying-force changing unit, the conveying force exerted by the conveying units during at the conveying and at the pressing.

A computer program product comprising a non-transitory computer-usable medium having computer-readable program codes embodied in the medium for a booklet conveying device, the program codes when executed causing a computer to execute:

• conveying a booklet made of a stack of folded sheets by a pair of conveying units that change a distance therebetween;
• positioning the booklet by making a leading-end portion of the booklet abut thereto by a positioning unit;
• pressing the booklet positioned by the positioning unit onto one of the conveying units in order to fix by a pressing unit;
• and
• changing, by a conveying-force changing unit, the conveying force exerted by the conveying units during at the conveying and at the pressing.