An image forming apparatus includes a transfer unit including a transfer nip portion, a fixing unit including a fixing nip portion, a suction belt conveyance unit arranged between the transfer unit and the fixing unit and conveying the sheet toward the fixing nip, a first casing, a second casing connected to the first casing and supporting the fixing unit, a first positioning portion, and, a second positioning portion. The first positioning portion is disposed in the first casing and performs positioning of the suction belt conveyance unit in a predetermined direction along a surface perpendicular to a width direction of the sheet. The second positioning portion is disposed in the second casing and performs positioning of the suction belt conveyance unit in the predetermined direction.

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 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 printing press arrangement has a plurality of processing stations for processing sheets. The plurality of processing stations are arranged one after another in a transport direction of the sheets for in-line processing of the sheets. At least one of the processing stations is configured as a non-impact printing device. A transfer device, which is arranged upstream of the active region of the non-impact printing device, is provided for transferring the sheets from a first processing station, which is arranged upstream of the non-impact printing device, to the non-impact printing device. The transfer device aligns, in each case, at least one of the axial register and the circumferential register and the diagonal register of each of the sheets in register relative to the printing position of the non-impact printing device.

A printing press arrangement has a plurality of processing stations for processing sheets. The plurality of processing stations are arranged one after another in a transport direction of the sheets for in-line processing of the sheets. At least one of the processing stations is configured as a non-impact printing device. A transfer device, which is arranged upstream of the active region of the non-impact printing device, is provided for transferring the sheets from a first processing station, which is arranged upstream of the non-impact printing device, to the non-impact printing device. The transfer device aligns, in each case, at least one of the axial register and the circumferential register and the diagonal register of each of the sheets in register relative to the printing position of the non-impact printing device.

The invention relates to a vacuum system for securing items in printing machines, comprising a printing table (2) with a perforated surface and, in relation thereto, a vacuum system for securing the items to be printed, which comprises a box structure (8) connected to a suction system and provided with a perforated wall in relation to the surface of the printing table (2), said box structure (8) having lateral panels that vertically close the interior thereof, which panels can be moved in order to adjust the gap between them in relation to the width of the items to be printed.

A sheet conveyor is provided for transporting a sheet. The sheet conveyor includes a supplying conveyor, a receiving conveyor and a sheet guidance unit. The receiving conveyor includes a support surface arranged for supporting the sheet on a contact side of the sheet and an attraction unit arranged for attracting the sheet to the support surface. The supplying conveyor includes a transport belt being arranged for advancing the sheet in a transport direction along a transport path towards the support surface of the receiving conveyor; the sheet having two side edge portions relative to the transport path. The sheet guidance unit is arranged at a downstream end of the transport path for guiding the sheet towards the receiving conveyor, wherein said sheet guidance unit includes a lifting element arranged for lifting both side edge portions of the sheet away from the support surface while a middle portion of the sheet in between both side edge portions is guided towards the support surface.

A sheet conveyor is provided for transporting a sheet. The sheet conveyor includes a supplying conveyor, a receiving conveyor and a sheet guidance unit. The receiving conveyor includes a support surface arranged for supporting the sheet on a contact side of the sheet and an attraction unit arranged for attracting the sheet to the support surface. The supplying conveyor includes a transport belt being arranged for advancing the sheet in a transport direction along a transport path towards the support surface of the receiving conveyor; the sheet having two side edge portions relative to the transport path. The sheet guidance unit is arranged at a downstream end of the transport path for guiding the sheet towards the receiving conveyor, wherein said sheet guidance unit includes a lifting element arranged for lifting both side edge portions of the sheet away from the support surface while a middle portion of the sheet in between both side edge portions is guided towards the support surface.

A device for processing substrates improves processing quality during separation or punching of such substrates. The device has a first processing cylinder and a second processing cylinder for treating substrates, and between which the substrate can be inserted. The substrate undergoes processing as it passes through the cylinder nip between the processing cylinders by use of tool parts that are active therein, and which may be chosen from a group composed of cutting tools, punching tools, creasing tools, perforating tools and grooving tools. The first processing cylinder has a sheet holding system and one of the first processing cylinder and the second processing cylinder has a tool carrier for receiving a tool part. An impression cylinder, which is in surface contact with the second processing cylinder, is assigned to the second processing cylinder, on the side thereof that faces away from the first processing cylinder.

A device for processing substrates improves processing quality during separation or punching of such substrates. The device has a first processing cylinder and a second processing cylinder for treating substrates, and between which the substrate can be inserted. The substrate undergoes processing as it passes through the cylinder nip between the processing cylinders by use of tool parts that are active therein, and which may be chosen from a group composed of cutting tools, punching tools, creasing tools, perforating tools and grooving tools. The first processing cylinder has a sheet holding system and one of the first processing cylinder and the second processing cylinder has a tool carrier for receiving a tool part. An impression cylinder, which is in surface contact with the second processing cylinder, is assigned to the second processing cylinder, on the side thereof that faces away from the first processing cylinder.