A binding device includes a sheet-bundle forming unit; a binding unit that executes a series of operation including inserting a wire into a sheet bundle and bending the wire; a power supply unit; a detector that detects a first timing for transitioning from bending operation to recovery operation; a first timekeeper that measures time from a start point of the series of operation to a first time point, which is an end of a scheduled first-timing detection period; a unit-of-processing manager; and a supply power controller. When the first time point is reached before detection of the first timing, the controller causes the power supply unit to adjust the electric power before the first timing is reached, such that the first timing is detected before the first time point in the series of operation for a second bundle belonging to the same unit of processing as a first bundle.

To provide a sheet bundle binding device capable of easily removing some sheets from a sheet bundle that has been subjected to staple-free binding. A corner Sc of a first sheet bundle Sb1 accumulated on a processing tray 24 is pressed and deformed between crimping toothed parts 54 and 55 of a staple-free binding unit 51 to bind the first sheet bundle Sb1 with a first binding force. Then, a corner of a second sheet bundle Sb2 obtained by accumulating additional sheets Sh2 on the first sheet bundle Sb1 is pressed and deformed between the crimping toothed parts 54 and 55 of the staple-free binding unit 51 to bind the second sheet bundle Sb2 with a second binding force smaller than the first binding force. Thus, the additional sheets can easily be removed from the second sheet bundle Sb2.

A post-processing apparatus comprises a first processing tray on which fed paper is placed; a paper binding section configured to bind a plurality of sheets of paper stacked on the first processing tray into one bundle; a second processing tray which a plurality of paper bundles bound on the first processing tray are sequentially conveyed to and placed on; a paper bundle gluing section configured to coat glue at a given position of the top surface of a first paper bundle placed on the second processing tray before a second paper bundle is placed on the first paper bundle; a pressing section configured to press and bind the first paper bundle with the second paper bundle between which glue is coated; and a control section configured to control the timing for conveying the second paper bundle onto the first paper bundle after the glue is coated.

A post-processing apparatus comprises a first processing tray on which fed paper is placed; a paper binding section configured to bind a plurality of sheets of paper stacked on the first processing tray into one bundle; a second processing tray which a plurality of paper bundles bound on the first processing tray are sequentially conveyed to and placed on; a paper bundle gluing section configured to coat glue at a given position of the top surface of a first paper bundle placed on the second processing tray before a second paper bundle is placed on the first paper bundle; a pressing section configured to press and bind the first paper bundle with the second paper bundle between which glue is coated; and a control section configured to control the timing for conveying the second paper bundle onto the first paper bundle after the glue is coated.

A control unit of a paper processing apparatus controls a driving unit such that pressing by a pressing member is released after an end portion of a paper bundle pressed by the pressing member is cut by a cutting blade, and controls, when determining that a front end portion of a removal member does not reach the pressing member at a position of the pressing member in a state in which the pressing by the pressing member has been released, the driving unit to move the pressing member to a position at which the front end portion of the removal member reaches the pressing member after the paper bundle is taken out.

A control unit of a paper processing apparatus controls a driving unit such that pressing by a pressing member is released after an end portion of a paper bundle pressed by the pressing member is cut by a cutting blade, and controls, when determining that a front end portion of a removal member does not reach the pressing member at a position of the pressing member in a state in which the pressing by the pressing member has been released, the driving unit to move the pressing member to a position at which the front end portion of the removal member reaches the pressing member after the paper bundle is taken out.

A sheet post-processing device includes a conveying section that conveys a paper sheet; a punch section that punches punch holes in the paper sheet conveyed by the conveying section; a stacker section that stores the paper sheet in which the punch holes are punched by the punch section; a binding section that binds a paper sheet bundle stored in the stacker section with a binding member; and a controller that controls the above sections. The controller selectively performs a ring binding mode and a direct binding mode. The ring binding mode is a mode in which punch holes are punched in the paper sheet by the punch section and then the binding member is made to penetrate the punch holes for binding. The direct binding mode is a mode in which the binding member is directly driven into the paper sheet bundle without punching the punch holes in the sheet.

A method for production of adhesive-bound printed products in a machine belonging to an adhesive-binder line. To change over from one job under production to a following job, supplied printed products of the following job are detected via a barcode and stopped prior to being fed into the machine of the adhesive-binder line. Remaining printed products of a preceding job are moved and fully processed through individual processing stations of the machine while the printed products of the following job remain in a waiting position in front of the machine. After completing the last printed product of the preceding job, an empty withdrawal of covers stored in a cover deposit and belonging to the following job is initiated until it is ensured that the stored covers are available for the printed products of the following job. After determining that a withdrawn cover securely matches the printed products of the following job, stopped printed products of the following job are released with a main control and fed into the machine for being processed via the individual processing stations.

A method for production of adhesive-bound printed products in a machine belonging to an adhesive-binder line. To change over from one job under production to a following job, supplied printed products of the following job are detected via a barcode and stopped prior to being fed into the machine of the adhesive-binder line. Remaining printed products of a preceding job are moved and fully processed through individual processing stations of the machine while the printed products of the following job remain in a waiting position in front of the machine. After completing the last printed product of the preceding job, an empty withdrawal of covers stored in a cover deposit and belonging to the following job is initiated until it is ensured that the stored covers are available for the printed products of the following job. After determining that a withdrawn cover securely matches the printed products of the following job, stopped printed products of the following job are released with a main control and fed into the machine for being processed via the individual processing stations.

A control portion of an image forming apparatus creates an image list for performing the perfect-binding imposition of the images of the pages on the sheets so that the scores formed on the sheets are on the external surface of the center-folded sheets, for the sheets each having a size twice the size specified as each of the sheets on which the images of the book body are to be formed, when a book-body stacking portion accommodates the sheets center-folded by a folding portion along scores formed for every sheet from a predetermined direction by a scoring portion for each of the sheets having the images formed thereon by the image forming portion, and a bookbinding portion uses a glue-on cover to perform case binding of a bundle of the sheets glued to the side of the spine.