Heidelberger Druckmaschinen Ag

Heidelberger Druckmaschinen

Heidelberger Druckmaschinen Aktiegesellschaft

Willi Jeschke

Gerhard Loffler

Anton Rodi

Rudi Junghans

Helmut Kipphan

Hugo Rambausek

Arno Wirz

Gerhard Pollich

Nikolaus Spiegel

Paul Schilling

Klaus Durrnagel

Willi Becker

Hans Ott

Hans-Georg Jahn

Hermann Beisel

Hans Muller

Wolfgang Pfizenmaier

Karl-Heinz Filsinger

Jurgen Reithofer

Werner Weber

Norbert Freyer

Lothar Stadler

Dieter Bergmeier

Gunther Hofmann

Rudolf-Karl Uhrig

Anton Breunig

Dimitrios Pyliotis

Werner Ewendt

Peter W Gogele

Jean-Pierre Graf

Sheet-fed printing press with flat sheet guidance, having two endless conveyor belts for rectilinear, intervention-free movement of gripper carriages through printing units of the press, includes a device for adjusting the length of the conveyor belts, and a device for synchronizing the speeds of the conveyor belts and of the cylinders of the printing press, the length-adjusting device being made-ready for matching the belt lengths automatically to the cylinder circumference during operation, each of the conveyor belts having associated therewith its own drive and its own mechanism for synchronizing the speed of the respective conveyor belt with the respective cylinders independently of the other one of the conveyor belts, and method of synchronizing the sheet travel with the cylinders of the press.

Sheet-fed printing press for synchronizing sheet travel and conveyor

Method for regulating a supply of dampening solution in an offset printing press having a printing plate includes supplying at least one selected region of the printing plate with a well-defined amount of energy; determining and measuring scumming occurring in the selected region; comparing the measured scumming in the selected region with a prescribed scumming matched to the respective supplied amount of energy; and adjusting the supply of dampening solution, if the measured scumming and the prescribed scumming deviate from one another; and a device for performing the method.

Method and device for regulating a supply of dampening solution in an

A method of registration correction by turning a flexible plate about a point on a cylinder of a press, which includes determining data regarding a deviation from registration of a defined register rotation in at least one of a circumferential, side and angular position of the plate from a specimen made from the plate, and issuing adjustment commands initiating adjustment operations in devices provided in the press for respectively turning the plate and for effecting circumferential and side register, the adjustment commands taking into account the determined data, so as to finally correct the register of a pattern produced by the printing plate.

Electronic apparatus and method of register correction

Assembly for influencing inking in printing machines including a color density measuring device, a device for comparing nominal values and actual measured values, at least one electronic computer for linking the measured values with adjustment values, devices for metering ink feed zonewise to a printing plate and having ink metering elements with appertaining adjustment members and feed-back or reply devices, including a plurality of displays assigned to the ink metering elements for representing adjustment values of all ink zone adjustment members, respectively, of a printing unit, said displays providing exact recommendations to an operator of the assembly, before adjustment of the inking zone adjustment members, for adjusting the adjustment members to predetermined positioning nominal values and signaling to the operator absolute adjustment travel thereof both in magnitude and direction and a positioning device having means selective by the operator for following up the ink zone adjustment members individually and of at least one printing unit, respectively, the positioning device being coupled with the displays.

Assembly for influencing inking in printing machines

Sheet-fed offset printing machine including a chain delivery and a control console assigned to the chain delivery and including a remote-control device and a sheet deposit structure for controlling quality of a freshly printed sheet during operation of the printing machine, the control console being actuable for effecting a test sheet withdrawal, the control console with the sheet deposit structure being arranged directly at an end of the chain delivery, as viewed in sheet travel direction, the sheet deposit structure being disposed below a sheet conveying path and a test-sheet outlet, respectively, as an extension of the chain delivery.

Sheet-fed offset and printing machine having a chain delivery and console

Device for cleaning at least one of a plate and a blanket cylinder of an offset printing machine, includes a plurality of cleaning elements disposed adjacent one another in a direction parallel to a cylindrical peripheral surface of at least one of a plate and a blanket cylinder; a driving device for positioning each of the cleaning elements towards and away from the at least one cylinder; and an input and control device for actuating a respective cleaning element; and method of operating the device.

Device for cleaning a plate cylinder and/or a blanket cylinder of an

A method of metering ink in offset printing machines having an ink cylinder with which a metering member adjustable into contact with the ink cylinder with a given pressure is associated, includes varying the contact pressure of the metering member against the ink cylinder as a function of at least one of the viscosity of the ink in a metering gap, the supply of dampening medium and the peripheral speed of the ink cylinder so that a constant specifiable thickness of ink film on the ink cylinder and a constant specifiable intensity of ink impression on the material to be printed is settable, and a device for carrying out the method.

Device for metering ink in offset printing presses

The invention relates to a device for tensioning flexible printing plates on a plate cylinder of a rotary printing machine by means of tensioning rails. The tensioning rails are provided in a cylinder channel for clamping the two plate ends. At least one tensioning rail is mounted on spring elements in a freely resilient manner for the purpose of tensioning the printing plates precisely and exactly.

Device for tensioning flexible printing plates on a plate cylinder of a

A print control strip which allows the optional use of both solid tone control/regulation and halftone control/regulation, and in which the color control/regulation is optimized on the basis of values derived from the solid tone density and the halftone density from single color and/or multicolor halftone fields. Such print control strips are used for control/regulation of the ink feed in the inking mechanism of rotary printing presses. The print control strip disclosed includes alternating single color solid tone fields for each ink color and single color halftone fields for each ink color, and multicolor halftone fields corresponding to every second color zone. There may also be zonally alternating single color solid tone fields for each ink color and multicolor halftone fields.

Print control strip

This invention relates to a process and a printing press for the production of multicolor impressions with several plate cylinders with corresponding inking mechanisms, whereby multicolor printing is made possible in the so-called direct printing process from plate to paper with a plate feed for the flexible printing plates or films and an automatic feed to the impression cylinders. Then the sheets to be printed are introduced via a sheet feed to the impression cylinder, and after the printing has been done, the used printing plates or films are transferred to an ejection apparatus.

Process and printing press to produce multicolor impressions

A display system for a rotary printing press for displaying the inking profile on an LED matrix. The profile indication is provided by means of a time shared display with control circuit which scans the positions of all the ink control members, all having position sensors, and sequentially accesses an analog-to-digital converter with decoded outputs which are converted to a number of LED columns, each represented by a continuously lighted LED the coarse position of the ink control member. A fine position indication may be provided by simultaneously showing a fine indication by means of a flash LED in the corresponding column. A still finer indication may be provided by means of a second flashing LED in the corresponding column.

System for indicating settings of ink feed for printing

An inking unit is for a rotary printing press having ink rollers for providing ink to a printing plate of a plate cylinder. The inking unit includes an ink fountain and an ink fountain roller for receiving a supply of the ink thereon from the ink fountain. A first distributor roller transfers ink thereon to the ink rollers. A transfer roller is disposed between the ink fountain roller and the first distributor roller for transferring at least some of the ink on the ink fountain roller to the first distributor roller. The transfer roller is generally cylindrical and includes a surface which has a circumference which alternately includes raised areas and recessed areas. The transfer roller is in contact with the ink fountain roller at at least one of the raised areas to receive some of the ink therefrom when at least one of the recessed areas is adjacent the first distributor roller to prevent contact therebeween. Additionally, the transfer roller is in contact with the first distributor roller at at least one of the raised areas to supply some of the ink thereto when at least one of the recessed areas is adjacent the ink fountain roller to prevent contact therebetween.

Inking unit for rotary printing presses

Sheet feeder for a printing machine includes a receiving device adjustable in height for taking up a pile formed of individual sheets, a front stop for leading edges of the sheets, and at least one side stop for the side edges of the sheets at one side of the pile; alignment elements located at least at an upper end of the pile and exerting alignment forces on the pile towards the front and the side stops; a loosening device for neutralizing, at least partly, adherence of the upper sheets to one another; a conveying device for withdrawing the respective uppermost sheet from the pile and feeding it into the printing machine; and an additional sheet alignment device acting upon the surface of the respective uppermost sheet, at least until it is taken over by the conveying device, in a way that the alignment device exerts alignment forces upon the sheet towards at least one of the stops; the additional sheet alignment device being offset with respect to the conveying device towards respective trailing edges of the sheets.

Sheet feeder for a printing machine

A process which makes possible a zonal ink control with the use of print control strips with single, double, or multizone repetition cycle of the measurement fields, and by means of which controlled variables can also be determined according to measurement strips without zonal separation for all ink zones. Substitute measurement values are formed by interpolation for each ink zone from determined measurements and from their lateral position in relation to the corresponding ink zones, and these substitute measurements are compared with setpoints, and the difference is used to determine controlled variables.

Process for the determination of controlled variables for the inking

Device for determining a register error between individual colors in multicolor printing machine, comprising a photoelectric scanning apparatus for scanning differently colored register marks printed together on a printed sheet, an evaluation apparatus interacting with the scanning apparatus for determining the relative positions of the individual register marks, the scanning apparatus being disposed in a housing to be positioned at a given measuring location on the stationary printed sheet, the scanning apparatus comprising a scanning head movably disposed in the housing, and drive a device provided in the housing for producing the scanning movement of the scanning head relative to the printed sheet within a relatively small scanning region.

Growing community of inventors

Heidelberg, Germany

Willi Jeschke