Rewinder for producing paper logs, comprising a winding station with a first winding roller, a second winding roller and a third winding roller driven by corresponding electric motors, including a detection system capable to detect a succession of diameters of the log being formed in the winding station and a programmable electronic unit connected to the electric motors. The system compares the measured diameters with a succession of corresponding diameters of predetermined value and to calculate a sequence of differences between these values. The electronic unit determines a parameter (a) related to the trend over time of the values. The electronic unit changes the relative speed of the first and second roll depending on the value of the parameter.

An installation includes a guide arrangement, guiding a material web, a conveying speed detection device, detecting a conveying speed of the conveyed material web, and a winding arrangement arranged downstream from the conveying speed detection device. The winding arrangement includes a rotatably mounted winding device, winding up the material web. The winding device is non-circular in cross section at least in a material web winding-up region, folding the material web. The winding arrangement has a rotary drive, in driving connection with the winding device, driving the winding device in rotation. An actuating device is at least temporarily in signal communication with the conveying speed detection device for receiving conveying speed signals therefrom, characterizing the respective conveying speed of the material web, and is at least temporarily in signal communication with the rotary drive for actuating the latter upon folding the material web in dependence on the conveying speed signals.

An installation includes a guide arrangement, guiding a material web, a conveying speed detection device, detecting a conveying speed of the conveyed material web, and a winding arrangement arranged downstream from the conveying speed detection device. The winding arrangement includes a rotatably mounted winding device, winding up the material web. The winding device is non-circular in cross section at least in a material web winding-up region, folding the material web. The winding arrangement has a rotary drive, in driving connection with the winding device, driving the winding device in rotation. An actuating device is at least temporarily in signal communication with the conveying speed detection device for receiving conveying speed signals therefrom, characterizing the respective conveying speed of the material web, and is at least temporarily in signal communication with the rotary drive for actuating the latter upon folding the material web in dependence on the conveying speed signals.

A sheet stacking device is provided with a hopper unit configured to stack a sheet, a feeding unit configured to feed out the sheet to the hopper unit, a distance detection unit configured to detect an inter-sheet distance, in the vertical direction, between a rear end portion of the sheet that is preceding and a tip end portion of the sheet that is subsequent, and an output unit configured to output a behavior stabilization command for the sheet based on the inter-sheet distance.

A sheet stacking device is provided with a hopper unit configured to stack a sheet, a feeding unit configured to feed out the sheet to the hopper unit, a distance detection unit configured to detect an inter-sheet distance, in the vertical direction, between a rear end portion of the sheet that is preceding and a tip end portion of the sheet that is subsequent, and an output unit configured to output a behavior stabilization command for the sheet based on the inter-sheet distance.

A sheet feeding device includes a roller pair being mutually non-separable; and a roller pair being mutually separable. The sheet feeding device temporarily stops a sheet in a registration position of the non-separable roller pair and then resumes feeding the sheet. The sheet feeding device feeds sheets such that a following sheet reaches the registration position from the separable roller pair after completion of ejection of a preceding sheet.

According to an embodiment, a processing method simulates conveyance of at least one web sheet conveyed in a conveying direction along a conveyance path from an unwinder to a winder. The processing method sets a conveyance velocity along the conveying direction as a velocity of a distal end node, which is an analysis node located at a distal end of the web sheet in the conveying direction. After setting the conveyance velocity to the distal end node, the distal end node is deleted based on a movement of the distal end node by a prescribed distance. The processing method updates the distal end node to an analysis node newly located at a distal end of the web sheet based on the deletion of the distal end node.

Provided are a medium conveying apparatus, a control method, and a control program is to enable further reduction in the time required for conveying the medium while suppressing the occurrence of the conveyance abnormality of the medium. A medium conveying apparatus includes a conveying mechanism to convey a medium, a determination module to determine whether a conveyance abnormality of the medium has occurred, and a control module to control the conveying mechanism so as to increase a conveyance speed of the medium to be conveyed thereafter, or reduce a conveyance interval of the medium to be conveyed thereafter if the conveyance abnormality of the medium has not occurred when a predetermined number of medium is conveyed.

Provided are a medium conveying apparatus, a control method, and a control program is to enable further reduction in the time required for conveying the medium while suppressing the occurrence of the conveyance abnormality of the medium. A medium conveying apparatus includes a conveying mechanism to convey a medium, a determination module to determine whether a conveyance abnormality of the medium has occurred, and a control module to control the conveying mechanism so as to increase a conveyance speed of the medium to be conveyed thereafter, or reduce a conveyance interval of the medium to be conveyed thereafter if the conveyance abnormality of the medium has not occurred when a predetermined number of medium is conveyed.

A feeding device includes an accommodation unit that accommodates paper, a feeding tray on which the paper is placed in the accommodation unit and that is controlled so as to be lifted and lowered in a case of being replenished with the paper, and a processor configured to determine a lifting and lowering speed of the feeding tray according to an operation by a user, and perform control such that a lifting and lowering speed of the feeding tray becomes slower than the determined lifting and lowering speed in a case of a state where the determined lifting and lowering speed of the feeding tray is unable to be realized.