Heidelberger Druckmaschinen Ag

Gunter Stephan

Peter Thoma

Richard Burkhard Mack

Andreas Detmers

Jurgen Zeltner

Gerd Raasch

Joachim Herrmann

Michael Szeidl

A turning device for a printing press, wherein a sheet printed on one side thereof is acceptable from an impression cylinder of an upline printing unit and is transferable to an impression cylinder of a downline printing unit, includes a first gripper device for accepting the sheet by a leading edge thereof from the upline impression cylinder, a register cylinder formed with a multiplicity of suction openings distributed over a circumferential surface thereof and being communicable with a negative pressure source for holding the sheet by suction and for guiding the sheet in-register with a leading edge thereof in the lead, the sheet, while being guided in-register, being held solely by the suction openings, and a second gripper device for accepting the sheet from the register cylinder at a trailing edge of the sheet.

Turning device for a printing press

A device for contact-free sheet guidance in a sheet-fed printing press, having a sheet guiding surface and an air guiding surface directed obliquely away from the sheet guiding surface, includes at least one blast air nozzle disposed in the sheet guiding surface and having a cross section formed as a ring slot sector having a center of curvature located within an opening of the blast air nozzle formed in the plane of the sheet guiding surface.

Device for contact-free sheet guidance in a sheet-fed printing press

In a sheet-fed printing press, a contact-free sheet guiding device having a sheet guiding surface is provided including at least one blast air nozzle disposed in the sheet guiding surface and having an air guiding surface directed obliquely downwardly with respect to the sheet guiding surface, the air guiding surface defining a cross section of the blast air nozzle disposed obliquely downwardly from the sheet guiding surface, the blast air nozzle being disposed so that a flow direction of blast air emerging from the blast air nozzle encloses, with the sheet guiding surface, a steep angle directed against the sheet from below, the blast air flow having a vertical directional component which is greater than a horizontal directional component thereof.

Contact-free sheet guiding device in a sheet-fed printing press

A contact-free sheet guidance device in a sheet-fed printing press, having a sheet guiding surface, includes at least one blast air nozzle formed in the sheet guiding surface and having a cross section directed obliquely downwardly with respect to the sheet guiding surface, the sheet guiding surface being formed with an opening for an air outlet directed substantially vertically at a sheet being fed in the sheet travel direction, the air outlet opening being disposed upstream of the blast air nozzle in the sheet travel direction and being smaller in cross section than the cross section of the blast air nozzle.

Contact-free sheet guidance device in a sheet-fed printing press

Sheet guiding device for a printing press having a guide surface member for guiding sheets includes blast air or suction nozzles provided in the guide surface member, the guide surface member being formed, as viewed in a sheet transport direction, successively of an entry region, a guide zone and an exit region, the nozzles provided in at least one of the entry and the exit regions of the guide surface member being suppliable selectively with suction or blast air in accordance with a type of printing material or stock to be processed, and the nozzles provided in the guide zone disposed between the entry region and the exit region of the guide surface member being suppliable with blast air, at least some of the nozzles being disposed so as to emit blast air substantially tangentially to a guide surface of the guide surface member.

Sheet guiding device for printing presses

A sheet-guiding system for a printing press, the sheet-guiding system being disposed in the vicinity of a transfer drum located between two sheet-guiding cylinders, respectively, disposed upstream and downstream of the transfer drum, as viewed in a sheet travel direction, the transfer drum being provided with rows of grippers movable along a travel path and having at least nearly closed surfaces between the rows of grippers, including an air guide element disposed above the transfer drum at a slight spacing from the travel path of the gripper rows, the air guide element defining an air chamber at the top thereof, the air chamber extending from the upstream to the downstream sheet-guiding cylinder, and a blower device for applying air to the air chamber in a direction towards the downstream sheet-guiding cylinder.

Sheet-guiding system for a printing press

Method for braking sheets in a delivery of a sheet-fed rotary printing press wherein the sheets are disposed in tandem and are successively fed to a sheet-pile position in translatory travel direction, the sheets being in an overlapping shingled arrangement in a vicinity of a sheet brake, an air-blast jet being applied beneath and parallel to the respective sheets, includes feeding the sheet to the sheet brake by means of gripper closure and a flotation-guiding arrangement, forming with the air-blast jet a carrying-air flow for producing the flotation-guiding arrangement and for simultaneously separating the sheets from an instant at which the sheets are being formed into the overlapping shingled arrangement, the carrying-air flow formed beneath an oncoming sheet continuing in the vicinity of the overlapping shingled arrangement of the sheets for forming an elongation of the flotation-guiding arrangement towards the delivery; and a device for performing the method.

Method and device for braking sheets in a delivery of a sheet-fed rotary

Method for pneumatically braking sheets in a delivery of a sheet-fed rotary printing press by means of blast air directed opposite to a sheet-transport direction for forming an air flow for braking the sheet includes adjusting the air flow for braking the sheet to a state of equilibrium between energy of the air flow acting upon the sheet and kinetic energy of the sheet, the sheet being carried in the region of a braking path in a contact-free manner by the air flow, and device for performing the method.

Method and device for pneumatically braking sheets in a delivery of a

A device in a printing press for applying air flow to printing stock being transferred by a transfer drum to an impression cylinder so as to achieve a flawless application of the printing stock on the impression cylinder before the printing stock reaches a printing nip defined by the impression cylinder and a blanket cylinder of the printing press includes a flat air-guide element extending over the breadth of the impression cylinder from a vicinity of the circumference of the transfer drum to as far as possible in a direction towards the printing nip so as to form a wedge-shaped space having a tip extending towards the printing nip.

Device for achieving a flawless application of printing stock in a

Sheet transfer drum mounted between printing units within side walls of a rotary printing press includes two gripper bars arranged symmetrically on a circumference of the sheet transfer drum so as to be located diametrically opposite one another on a y-axis of the sheet transfer drum; a drum body core formed with side surfaces extending between the gripper bars over the entire length of the sheet transfer drum within the circumference of the sheet transfer drum and having a convex curvature with a curvature gradient which is largest in the region of the x-axis and diminishes continuously towards the gripper bars.

Sheet transfer drum

Device for contactless guidance of sheetlike material being dragged along a travel path, the device having a guide surface member extending spaced from the travel path and being provided with air-blowing nozzles, includes a guide zone formed in the guide surface member wherein the air-blowing nozzles are disposed in a manner that a common flow pattern or gap flow formed during guidance of the sheetlike material is determined essentially by a first velocity component in a direction of motion of the material along the travel path and by a second and a third velocity component directed towards two side edges, respectively, of the travel path, the second velocity component being associated with one of the side edges and the third velocity component being associated with the other of the side edge.

Device for contactless guidance of sheetlike material

Method for guiding a sheet in vicinity of a sheet slow-down device of a sheet-processing machine. The sheet is gripped at a leading edge thereof with of a gripper system and the sheet is transported in a sheet-transport direction along a sheet travel path. The sheet has a defined region with which the sheet comes into contact with a sheet slow-down device for subsequently forming a sheet pile, and directing the sheet, in the vicinity of the sheet slow-down device, into a range of influence of a flotation guide produced along a guiding surface member by an air flow. The flotation guide, without taking into account the influence of the sheet slow-down device, is effective for bringing the sheet to a normal flotation level located above the guiding surface member. The sheet is supplied to the sheet slow-down device at a height level above the normal flotation level in order to form sheet-stabilizing vacuum forces resulting from the air flow. There is also disclosed a device for performing the method.

Method and device for guiding a sheet with a pneumatic sheet floatation

A guide device for moving sheet material in printing presses, which by means of blown air, presses the sheet material flat against the cylindrical surface of a transporting drum or a cylinder, essentially without any contact between the sheet material and the guide device. The guide device can have a guide plate which generates a stream of blown air in the direction opposite to the direction of travel of the moving sheet material.

Growing community of inventors

Wiesloch-Baiertal, Germany

Gunter Stephan