A substrate printing system is disclosed having a perforated conveyor belt adapted for transporting on the same a substrate to be printed, wherein the perforated conveyor belt has a set of perforations; a perforated grill which has a set of perforations and which is configured such that the perforated conveyor belt can be moved over the perforated grill; and a suction chamber which has a suction element, the suction chamber being in communication with the perforated conveyor belt and with the perforated grill such that the suction flow created by the suction element is adapted for passing through perforations of the perforated conveyor belt and of the perforated grill to secure the substrate to the perforated conveyor belt.

An air fan assembly includes a suction box including a wall having an open area distributed across the wall. The suction box is configured to contain an underpressure on an inner side of the wall, so as to cause a cut sheet to adhere to a perforated transport belt. An impingement unit is configured to expel air supplied thereto towards the perforated transport belt. An air fan is arranged to create and maintain the underpressure in the suction box and to supply the air to be expelled by the impingement unit via an air outlet of the suction box. A first valve is arranged upstream of the air fan for conditionally admitting an additional air flow into the suction box. An inkjet printer and a method of operating the air fan assembly include the air fan assembly.

A sheet-processing machine and a method for operating a sheet-processing machine are disclosed. Sheets from a stack are separated and are accelerated, by a primary acceleration device, to a first speed and are then accelerated by a secondary acceleration device, to a second speed and then are processed by a processing module at a processing speed. The first speed is at least 20% lower than the processing speed. A drive of the primary acceleration device and a drive of the secondary acceleration device and a drive of the processing module, each have dedicated drive control systems which are connected, by circuitry, to a machine controller of the sheet-processing machine.

An inkjet printer includes an air-permeable media-support-layer positioned on top of a vacuum table. The vacuum table includes a plurality of cavity rooms, connected to a vacuum source, for forming a plurality of vacuum zones on the air-permeable media-support-layer; each cavity room from the plurality of cavity rooms is closed by an air-permeable part from the air-permeable media-support-layer for forming a vacuum zone from the plurality of vacuum zones. Each cavity room from the plurality of cavity rooms includes a) a space formed by a set of walls; and b) a bottom layer including a set of air-channels; wherein a ratio of width to length from the minimum bounding box of the area formed by the set of walls is between 1:1 and 2:5.

In an example, a media conveyor includes a media support platform having a suction hole, and a valve to selectively close the suction hole. A valve actuator to actuate the valve includes an air tube having an air inlet and a seal to selectively seal the air inlet.

A sheet folding apparatus includes a sheet folding unit disposed to fold a sheet and a conveyance unit disposed to feed the sheet to the sheet folding unit in a feed direction orthogonal to a fold direction of the sheet folding unit while correcting a skew of the sheet. The conveyance unit includes an elongated reference guide, a conveyance mechanism disposed to convey the sheet in the feed direction while exerting a force on the sheet toward the reference guide, an adjustment mechanism disposed to adjust an inclination of the reference guide with respect to the feed direction. The apparatus further includes an input unit through which a user inputs a folding misalignment amount of the sheet folded by the sheet folding unit. The inclination of the reference guide is corrected by the adjustment mechanism based on at least the folding misalignment amount inputted through the input unit.

A printer includes a print station; a media transport mechanism arranged for conveying print media on a transport path past the print station, the transport mechanism having a support surface for supporting the media; and a vacuum device arranged for attracting the media against the support surface on a section of the transport path downstream of the print station. The vacuum device is divided, in the direction along the transport path, into at least two segments in which the media are attractable with different non-zero suction pressures.

A device for overlapping sheets includes at least one blower box and a supply table. Multiple sheets are guided into a region of the blower box consecutively, in the same transport direction, and are arranged at a distance from one another on the supply table. A blower nozzle is arranged in the blower box, on the side thereof facing the supply table. A blowing direction of the blower nozzle is oriented and parallel to the supply table and against the transport direction of the sheets. The supply table is arranged below the blower box and multiple blower nozzles are arranged in the blower box, one after the other, in the transport direction of the sheets, on the side thereof facing the supply table. A respective blowing direction of the blower nozzles is oriented in parallel to the supply table, and against the transport direction of the sheets.

A sheet conveying device includes a first conveyer and a second conveyer, each including a upstream-side pulley and a downstream-side pulley with respect to a conveying direction, an endless belt stretched around these pulleys, and a suction mechanism provided on an inner periphery relative to a conveying surface of the endless belt, along the conveying direction, wherein a third conveyer including a upstream-side pulley and a downstream-side pulley relative to the conveying direction and an endless belt stretched around these pulleys is provided between the first conveyer and the second conveyer, and in a state where the third conveyer is viewed from a side of the conveying surface, the upstream-side pulley of the third conveyer is arranged to be overlapped with the downstream-side pulley of the first conveyer, and the downstream-side pulley of the third conveyer is arranged to be overlapped with the upstream-side pulley of the second conveyer.

A separation device is usable for separating portions of a material web. The separation device has at least one front clamping device, with at least one front clamping point, and at least one rear clamping device, with at least one rear clamping point, and at least one first stretching element. The separation device can be switched between at least one traversing mode and at least one separation mode by the movement of at least the at least one first stretching device between at least one first traversing position and at least one first separation position. A transport line is the shortest connection between the at least one front clamping point and the at least one rear clamping point, that connection line completely on a vertical reference plane and traversing or running at a tangent to any component of the separation device on the respective same side as one of a transport path provided for the material web and the portions to be separated. The transport line, in the at least one separation mode, is 2 mm longer than in the at least one traversing mode and has the smallest radius of curvature in the at least one separation mode of at least 0.05 mm. A first reference plane and a second reference plane are mutually spaced apart in an axial direction and a first transport line, lying on the first reference plane, and a second transport line, lying on the second reference plane, have different lengths when the first stretching element is located in the at least one first separation position.