To prevent erroneous transfer onto a paper sheet loading platform and improve the operation stability over the entire length of a long-edge direction of a pressing member by ensuring a long time during which the pressing member continues to push in a paper sheet alone. To include two rotating bodies 120 and 130 that have recesses 120a and 130a and are rotatable in opposite directions to each other in synchronization with each other, a pressing member 140 that is movable and presses an intermediate portion of a back of a paper sheet forward, a drive mechanism 180, and a paper sheet loading platform 200. The drive mechanism rotates each rotating body by an angle from 195 degrees to 270 degrees in a time period after the pressing member starts to bring a center of the paper sheet into contact with the paper sheet loading platform from an initial state until the pressing member leaves the center of the paper sheet.

A sheet material conveyance device includes a plurality of first holding heads each having a curved first holding surface, a first drum holding the plurality of first holding heads, a plurality of second holding heads each having a planar second holding surface, a second drum holding the plurality of second holding heads, a tilt adjustment mechanism structured to adjust a tilt of each second holding surface, and a speed adjustment mechanism structured to adjust a relative movement speed of the first holding head and the second holding head. The first holding head and the second holding head move to a delivery position, and deliver the sheet material between the first holding surface and the second holding surface in a situation in which adjustment is performed by the tilt adjustment mechanism and the speed adjustment mechanism.

A saddle stitcher for printed products includes a saddle chain; a stitching machine; a controller; an ejector; and a delivery system. The delivery system includes: at least one lower conveyor belt and one upper conveyor belt; and at least one deflection roller for the lower conveyor belt, the at least one deflection roller being arranged in a radius. The lower conveyor belt has a first controllable self-propelled drive. The upper conveyor belt has a second controllable self-propelled drive. The controller is configured to separately control the first controllable self-propelled drive and the second controllable self-propelled drive. The controller is configured to provide a control that is exact to a cycle and is adjustable according to a thickness and a format of a respective printed product in a product flow.

To prevent erroneous transfer onto a paper sheet loading platform and improve the operation stability over the entire length of a long-edge direction of a pressing member by ensuring a long time during which the pressing member continues to push in a paper sheet alone. To include two rotating bodies 120 and 130 that have recesses 120a and 130a and are rotatable in opposite directions to each other in synchronization with each other, a pressing member 140 that is movable and presses an intermediate portion of a back of a paper sheet forward, a drive mechanism 180, and a paper sheet loading platform 200. The drive mechanism rotates each rotating body by an angle from 195 degrees to 270 degrees in a time period after the pressing member starts to bring a center of the paper sheet into contact with the paper sheet loading platform from an initial state until the pressing member leaves the center of the paper sheet.

A saddle stitcher for printed products includes a saddle chain; a stitching machine; a controller; an ejector; and a delivery system. The delivery system includes: at least one lower conveyor belt and one upper conveyor belt; and at least one deflection roller for the lower conveyor belt, the at least one deflection roller being arranged in a radius. The lower conveyor belt has a first controllable self-propelled drive. The upper conveyor belt has a second controllable self-propelled drive. The controller is configured to separately control the first controllable self-propelled drive and the second controllable self-propelled drive. The controller is configured to provide a control that is exact to a cycle and is adjustable according to a thickness and a format of a respective printed product in a product flow.

A sheet material conveyance device includes a plurality of first holding heads each having a curved first holding surface, a first drum holding the plurality of first holding heads, a plurality of second holding heads each having a planar second holding surface, a second drum holding the plurality of second holding heads, a tilt adjustment mechanism structured to adjust a tilt of each second holding surface, and a speed adjustment mechanism structured to adjust a relative movement speed of the first holding head and the second holding head. The first holding head and the second holding head move to a delivery position, and deliver the sheet material between the first holding surface and the second holding surface in a situation in which adjustment is performed by the tilt adjustment mechanism and the speed adjustment mechanism.