A system and method for performing quality control in a digital printing system (DPS) is provided. The DPS includes an impression station for transferring an ink image from a surface of an intermediate transfer member to a substrate. The impression station includes an impression cylinder housing one or more grippers operable to grasp and hold a leading edge of the substrate as it passes through the DPS, for conveying the substrate along the impression cylinder during the transfer of the ink image. An imaging device is operable, during advancement of the substrate on the impression cylinder, to capture a digital image including a region of interest (ROI) that is associated with at least a portion of the grippers and at least a portion of the substrate. A controller is configured, based on the digital image, to indicate an error in a position of the substrate relative to the grippers.

In an ink jet recording device in which a paper supporting part is constituted by a first support and a second support having a comb teeth structure, a region where paper is supported by only the first support is defined as a first region, a region where the paper is supported by only the second support is defined as a second region, and a region where the paper is supported by the first support and the second support is defined as a third region. Charts including a plurality of grayscales for the respective regions are drawn. The respective drawn charts are read by an image reader. Correction values of density unevenness are obtained for the respective regions on the basis of the reading results. Density data of an image are corrected for the respective regions on the basis of the correction values of the density unevenness for the respective regions.

A sheet-processing machine includes a turning device. Sheets can be conveyed, by a sheet conveyor system, from a sheet guide cylinder in the turning device, and can be conveyed in a sheet conveyor direction on a sheet conveyor path. A sheet guide element is provided beneath or along the sheet conveyor path. A deionization device is assigned to the sheet guide element. The deionization device can provide positive and negative ions.

A method for printing on sheets in an inkjet process using nozzles includes transporting the sheets on a drum. When the nozzles are actuated by a computer, banding defects are compensated for and the computer factors in or takes into consideration thermal properties of the drum as it actuates the nozzles.

A digital printing press includes a printing cylinder configured to transport a sheet, a driving device (41) configured to drive the printing cylinder, an encoder (44) configured to detect the phase of the printing cylinder, and first to fourth inkjet nozzle heads (23-26) configured to print the sheet. The digital printing press includes a floating detector (22) facing the printing cylinder and configured to detect an abnormality of the sheet, and a control device (28) configured to control an operation of the driving device (41). The control device (28) includes a function of stopping the driving device (41) when the floating detector (22) detects a floating portion. The control device (28) includes a function of operating the driving device (41) based on the phase of the printing cylinder when the floating detector (22) detects the floating portion and the phase of the printing cylinder when the driving device (41) stops after floating detection and moving the floating portion detected by the floating detector (22) to a predetermined confirmation position. It is possible to provide a digital printing press capable of quickly specifying an abnormality occurrence portion detected during printing.

A digital printing press includes a printing cylinder configured to transport a sheet, a driving device (41) configured to drive the printing cylinder, an encoder (44) configured to detect the phase of the printing cylinder, and first to fourth inkjet heads (23-26) configured to print the sheet. The digital printing press includes a floating detector (22) facing the printing cylinder and configured to detect an abnormality of the sheet, a display device (8), and a control device (28) configured to control an operation of the driving device (41). The control device (28) includes a function of stopping the driving device (41) when the floating detector (22) detects a floating portion. The control device (28) includes a function of obtaining information specifiable a position of an abnormality occurrence portion based on the phase of the printing cylinder when the floating detector (22) detects the floating portion and the phase of the printing cylinder when the driving device (41) stops after floating detection and displaying the information on the display device (8). It is possible to provide a digital printing press capable of quickly specifying an abnormality occurrence portion detected during printing.

A digital printing machine comprises a cylindrical drum assembly on the rigid printing framework. A cylindrical drum moves along and rotates about its central cylindrical axis and a stationary printing head with multiple nozzles placed proximately above the circumference of the cylindrical drum. The combined linear and rotational movements of the cylindrical drum enable the printing head to create a smooth helical printing trajectory on the flexible fabrics. The cylindrical drum of the digital printing machine also works as a working drum to hold a piece of flexible textile to be printed. A double-side printing mechanism allows the digital printing machine to automatically carry out the second side printing.

A device for further processing web- or sheet-type stock comprises a further-processing section, in which stock that is supplied on the input side can be processed into printed products. The further-processing section comprises, in the guide path of a processing line through which the stock has run, at least one first combining device relative to the stock path, which can combine one- or multi-layer stock sections to a bundle; a second combining device which can combine the bundles formed by the first combining device to a bundle stack downstream of the first combining device; and a transverse folding device which is arranged functionally downstream of the second combining device and which transversely forms the bundles or bundle stacks relative to the conveying device on the input side when they exit the second combining device. A device for joining several layers is placed in the guide path, such that it can join several or all of the stock sections combined in the first combining device into a bundle, before they are received by the second combining device and is associated with, are arranged downstream of the first combining device. During production of the products, a combined bundle is stapled before it is combined with one or more other bundles and is then transversely folded. In addition, a longitudinal cutting device is provided in the guide path downstream of the transverse folding device.

A sheet-fed printing press includes a printing cylinder and a high-precision sensor system for monitoring a sheet run in the area of the printing cylinder. At least one gage, which is mounted on the printing cylinder, can be detected by the sensor system. It is particularly advantageous if the sensor system is configured to be self-calibrating. A method for calibrating a sensor system and a method for aligning a sensor system are also provided.

An impression station of a printing system comprises a rotatable impression cylinder with an impression cylinder gap housing a plurality of grippers recessed therein. A pressure cylinder assembly comprises a pressure cylinder comprising a pressure cylinder gap and an angle portion joining a trailing edge of the pressure cylinder gap and an outer circumferential surface of the pressure cylinder. A compressible blanket is disposed around the circumference of the pressure cylinder. A margin insert is interposed between the pressure cylinder and the compressible blanket at least at the angle portion, such that a local external geometry of the pressure cylinder assembly at the angle portion is changed by the presence of the margin insert. The change in the local external geometry of the pressure cylinder assembly due to the presence of the margin insert is effective to reduce a dimension of an unprinted leading-edge margin.