An image forming apparatus, including: a printing unit configured to print on a sheet; a bookbinding unit configured to perform a cutting process of cutting a binding member for binding a plurality of sheets before sheets printed by the printing unit are stacked on a stack tray and perform a binding process of binding the sheets by the cut binding member; and a controller configured to cause the bookbinding unit to perform the cutting process of the binding member based on sheet size information, the controller controls, in a case of producing a plurality of copies of bookbound products, not to perform the cutting process of the binding member of a second copy while sheets are stacking as a first copy, but to perform the cutting process of the binding member of a next copy while sheets are stacking as each of the second copy and subsequent copies.

An image forming apparatus, including: a printing unit configured to print on a sheet; a bookbinding unit configured to perform a cutting process of cutting a binding member for binding a plurality of sheets before sheets printed by the printing unit are stacked on a stack tray and perform a binding process of binding the sheets by the cut binding member; and a controller configured to cause the bookbinding unit to perform the cutting process of the binding member based on sheet size information, the controller controls, in a case of producing a plurality of copies of bookbound products, not to perform the cutting process of the binding member of a second copy while sheets are stacking as a first copy, but to perform the cutting process of the binding member of a next copy while sheets are stacking as each of the second copy and subsequent copies.

An image forming apparatus including: a printer; a puncher configured to punch the sheet printed by the printer; a binder configured to perform a bookbinding process to form a bound product in which a binding member penetrates punch holes of sheets; a first detector configured to detect a first jam of a sheet in the binder; a second detector configured to detect a second jam of a sheet which occurs upstream of the binder; an annunciator configured to notify information; and a controller configured to cause the annunciator to notify first instruction information for instructing removal of a sheet and the binding member, when the first detector has detected the first jam; and cause the annunciator to notify second instruction information for instructing removal of the second jam when the second detector has detected the second jam and the first detector has not detected the first jam.

A sheet binding device includes a first tooth-shaped member that has plural arranged teeth, and a second tooth-shaped member that has plural arranged teeth, bites the first tooth-shaped member to clamp and bind sheets in cooperation with the first tooth-shaped member, and is tilted relative to the first tooth-shaped member from a beginning of biting to a completion of biting.

An image forming apparatus including: a printer; a puncher configured to punch the sheet printed by the printer; a binder configured to perform a bookbinding process to form a bound product in which a binding member penetrates punch holes of sheets; a first detector configured to detect a first jam of a sheet in the binder; a second detector configured to detect a second jam of a sheet which occurs upstream of the binder; an annunciator configured to notify information; and a controller configured to cause the annunciator to notify first instruction information for instructing removal of a sheet and the binding member, when the first detector has detected the first jam; and cause the annunciator to notify second instruction information for instructing removal of the second jam when the second detector has detected the second jam and the first detector has not detected the first jam.

A sheet binding device includes a first tooth-shaped member that has plural arranged teeth, and a second tooth-shaped member that has plural arranged teeth, bites the first tooth-shaped member to clamp and bind sheets in cooperation with the first tooth-shaped member, and is tilted relative to the first tooth-shaped member from a beginning of biting to a completion of biting.