The present invention relates to systems and methods for calculating the additional local stretching of a moving web through a converting process in order, during rewinding, to find the position of defects in the web that were identified during winding and stopping the web with the web defect close to or at a defect correcting station. The method comprises, during rewinding of the web, the steps of detecting position markers (PM(n)) applied during winding of the web (5), measuring the distance between the position markers, calculating the additional local stretching between the position markers occurring during rewinding, applying the calculated additional local stretching to the known position of a following web defect to determine an estimated position of that web defect in the rewinding web. A method for correcting a web defect comprises the step of subsequently stopping the web with the web defect at, or close to, a defect repairing station (38).

Provided is a sheet processing apparatus including: a sheet processing section that performs sheet processing on a conveyed sheet along a width direction orthogonal to a conveyance direction of the conveyed sheet; and a hardware processor that sets a sheet processing position from a leading end or a trailing end in the conveyance direction and that reverses the set sheet processing position in the conveyance direction of the sheet according to a direction of a face of the conveyed sheet.

A sheet conveyance apparatus includes a stacking tray, a conveyance roller, a first sensor configured to detect the sheet, a second sensor configured to detect the sheet, the second sensor and the first sensor being located side by side in a width direction, a controller configured to execute stopping processing to stop conveyance of the sheet based on the first sensor and the second sensor, and a display portion configured to display a predetermined screen configured to set a different-width mixed stacking mode in a case where the stopping processing is executed based on the first sensor and the second sensor.

An image forming apparatus is capable of correcting a lateral deviation and/or a skew of a sheet. A pair of conveying rollers convey the sheet to a transfer position of an image. An image sensor reads the sheet on an upstream side of the transfer position in a sheet conveying direction. A control device senses a foreign substance on a reading surface of the image sensor as well as calculate a lateral deviation amount and/or a skew amount of the sheet based on an output signal of the image sensor.

The present invention relates to systems and methods for calculating the additional local stretching of a moving web through a converting process in order, during rewinding, to find the position of defects in the web that were identified during winding and stopping the web with the web defect close to or at a defect correcting station. The method comprises, during rewinding of the web, the steps of detecting position markers (PM(n)) applied during winding of the web (5), measuring the distance between the position markers, calculating the additional local stretching between the position markers occurring during rewinding, applying the calculated additional local stretching to the known position of a following web defect to determine an estimated position of that web defect in the rewinding web. A method for correcting a web defect comprises the step of subsequently stopping the web with the web defect at, or close to, a defect repairing station (38).