Spine folded portion flattening apparatus, sheet treating apparatus and image forming apparatus

A spine folded portion flattening apparatus which flattens a spine folded portion of a folded sheet bundle, comprising:

• a conveying portion which conveys the folded sheet bundle;
• a stopper which stops a top of the spine folded portion of the sheet bundle conveyed by the conveying portion
• a moving device which moves the folded sheet bundle stopped by the stopper, in a direction parallel to the spine folded portion of the folded sheet bundle;
• and
• a pressing portion which compresses and deforms the top of the spine folded portion of the folded sheet bundle being moved by said moving device so as to flatten the spine folded portion,
• wherein said moving device has a pair of rotary members rotated with the sheet bundle nipped therebetween to thereby move the sheet bundle in the direction parallel to the spine folded portion of the sheet bundle.

A sheet treating apparatus which performs treatment on a sheet, comprising:

• a folding device which folds the sheet;
• a conveying portion which conveys a sheet bundle folded by the folding device;
• a stopper which stops a top of the spine folded portion of the sheet bundle conveyed by the conveying portion;
• a moving device which moves the folded sheet bundle stopped by the stopper, in a direction parallel to the spine folded portion of the sheet bundle;
• and
• a pressing portion which compresses and deforms the top of the spine folded portion of the sheet bundle being moved by said moving device so as to flatten the spine folded portion.

An image forming apparatus comprising:

• an image forming portion which forms an image on a sheet;
• and
• a sheet treating apparatus which performs treatment on the sheet on which the image has been formed by said image forming portion,
• said sheet treating apparatus including:
• a folding device which folds the sheets;
• a conveying portion which conveys a sheet bundle folded by the folding device;
• a stopper which stops a top of the spine folded portion of the sheet bundle conveyed by the conveying portion;
• a moving device which moves the folded sheet bundle stopped by the stopper, in a direction parallel to the spine folded portion of the folded sheet bundle;
• and
• a pressing portion which compresses and deforms the top of the spine folded portion of the sheet bundle being moved by said moving device so as to flatten the spine folded portion.