Abstract

A method for computer-aided sheet running control in a sheet-fed printing machine includes, during a printing operation, using a measuring sensor to detect a printed sheet in the printing machine and using an activation sensor to initiate measuring performed by the measuring sensor by emitting an activation signal. The activation sensor is mechanically fixedly installed without adjustment, and temporal deviations of the activation signal are determined and compensated. A system for computer-aided sheet running control in a sheet-fed printing machine is also provided.

IPC Classes  ?

• B41J 13/00 - Devices or arrangements specially adapted for supporting or handling copy material in short lengths, e.g. sheets

Abstract

A method for cleaning a printing fluid off a surface of at least one rotatable component of a printing press includes selecting and executing one of a plurality of predefined cleaning operations in an automated way. The selection is made on the basis of a predefined mathematical model executed on a computer and, when the model is executed, a parameter corresponding to an amount of the printing fluid present on the surface is calculated. The improved cleaning method may be applied in all modes of operation of the printing press and in particular allows detergent, cleaning cloth, and/or water to be saved.

IPC Classes  ?

• B41F 33/16 - Programming systems for automatic control of sequence of operations
• B41F 35/00 - Cleaning arrangements or devices

Abstract

A seal for a doctor blade device in a printing press includes a blade contacting section with a front side engaged with a doctor blade of the doctor blade device and a rear side that is softer, more elastic or more resilient than the front side. A doctor blade device having a seal is also provided.

IPC Classes  ?

• B41F 9/10 - Wiping mechanisms with doctors, scrapers, or like devices
• B41F 31/02 - Ducts, containers, supply or metering devices

Abstract

A method for cleaning an anilox printing unit includes a first process step and a second process step immediately following the first process step without any intermediate printing operation. In the first process step, printing ink is supplied to a screen roller from a blade-type ink fountain while an ink applicator roller is in contact with the screen roller and out of contact with a bridge roller of a dampening unit. In the second process step, printing ink is removed from the screen roller and returned into the same blade-type ink fountain while the ink applicator roller is engaged with the screen roller and with the bridge roller.

IPC Classes  ?

• B41F 35/04 - Cleaning arrangements or devices for inking rollers
• B41F 35/00 - Cleaning arrangements or devices
• B41F 31/30 - Arrangements for tripping, lifting, adjusting, or removing inking rollersSupports, bearings, or forks therefor

Abstract

A method for setting up printing presses includes providing cylinders, a drive for at least one cylinder, a register adjustment device for at least one cylinder and at least one control unit. During set-up operations on the printing press, the control unit actuates the register adjustment device while the printing press is being accelerated or decelerated or while washing operations in the printing press are being carried out and while a production run is switched off and cylinders are rotating. A printing press carrying out the method is also provided.

IPC Classes  ?

• B41F 27/00 - Devices for attaching printing elements or formes to supports
• B41F 33/00 - Indicating, counting, warning, control or safety devices
• B41F 27/12 - Devices for attaching printing elements or formes to supports for attaching flexible printing formes

Abstract

A method and an apparatus for changing a printing plate on a printing press, include feeding the printing plate to a withdrawal chute of a plate changing apparatus by rotating the plate cylinder backward. Drivable transport rollers grip the printing plate and pull the latter out of a previously opened clamping device for the leading edge of the printing plate during the plate cylinder rotation, without the plate cylinder having to be stopped.

IPC Classes  ?

• B41F 27/12 - Devices for attaching printing elements or formes to supports for attaching flexible printing formes
• B41F 27/00 - Devices for attaching printing elements or formes to supports

Abstract

A method of signaling or indicating a coloration condition upon a change of an operating condition in a printing press having a control unit, includes the steps of specifying a target ink density for a print job, storing the specified target ink density in the control unit, calculating an actual ink density using the control unit based on an actual operating condition of the printing press, comparing the actual ink density to the target ink density in the control unit, and emitting a first signal using the control unit when the actual ink density is within a range of tolerance about the target ink density stored in the control unit.

IPC Classes  ?

• H04N 1/405 - Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
• B41F 33/02 - Arrangements of indicating devices, e.g. counters
• B41F 33/00 - Indicating, counting, warning, control or safety devices
• H04N 1/60 - Colour correction or control

Abstract

A method controls a printing speed and a temperature of a printing press to attain a predetermined actuating variable. The printing press includes a control computer. The method is characterized by calculating a target temperature to attain the predetermined actuating variable at a desired printing speed and initiating the adjustment operations to attain the target temperature by the control computer. The actual printing speed is changed via a first acceleration within a tolerance limit with respect to fluctuations about the predetermined actuating variable. The first acceleration process is stopped if the desired printing speed is attained in the process. The first acceleration is changed if the tolerance limits are reached and the desired printing speed has not been attained yet. The printing speed is ran at a modified second acceleration along the tolerance limits until the desired printing speed is attained.

IPC Classes  ?

• B41F 13/22 - Means for cooling or heating forme or impression cylinders
• B41F 31/00 - Inking arrangements or devices
• B41F 33/00 - Indicating, counting, warning, control or safety devices
• B41F 7/02 - Rotary lithographic machines for offset printing
• B41F 7/06 - Rotary lithographic machines for offset printing using printing units incorporating one forme cylinder, one transfer cylinder, and one impression cylinder, e.g. for printing on webs for printing on sheets

Abstract

A method for controlling an amount of dampening solution in a printing unit of a printing press using a computer and a measuring device, includes setting an amount of dampening solution in the printing unit based on data of a current print job, reducing the amount of dampening solution towards a smearing threshold with the computer, recording color measurement values with the measuring device in at least one full tone area with low area coverage and in at least one halftone area with high area coverage on a printing material of the current print job, and stopping the reduction of the amount of dampening solution with the computer when a dot gain of the halftone in areas with high area coverage increases significantly and a density of the full tone in areas with low area coverage increases significantly.

IPC Classes  ?

• B41F 23/02 - Devices for treating the surfaces of sheets, webs or other articles in connection with printing by dampening
• B41L 25/00 - Devices for damping printing surfaces, e.g. moistening printing surfaces in connection with lithographic printing
• B41F 7/24 - Damping devices
• B41F 33/10 - Tripping devices or stop-motions for starting or stopping operation of damping or inking units

Abstract

A printing press includes an anilox printing unit having a screen roller and a feed blade as components, in which ink accumulates on an outer side of the feed blade during printing. A method for operating the anilox printing unit includes removing the accumulated ink from the feed blade by moving one of the two components relative to the other of the two components in a first direction in a first step, causing the accumulated ink to be flattened by the feed blade and to be spread onto the screen roller. The component that was moved in the first direction in the first step may be moved in an opposite, second direction in a second step, causing the accumulated ink to be scraped off the screen roller by the feed blade.

IPC Classes  ?

• B41F 31/00 - Inking arrangements or devices
• B41F 31/04 - Ducts, containers, supply or metering devices with duct-blades or like metering devices
• B41F 31/06 - Troughs or like reservoirs with immersed, or partly immersed, rollers or cylinders
• B41F 9/10 - Wiping mechanisms with doctors, scrapers, or like devices

Abstract

A method of operating a sheet-fed printing press includes storing various print jobs and/or associated setting values and process steps in a memory device to set up the printing press upon a job change. A computer implements or suggests settings or process steps of the printing press for a print job based on the job data of a print job and/or as a result of inputs by the operator. Before or immediately after a print job is completed, the computer generates a query requesting inputs that determine if the same print job requires further passes and if so, which passes are required and, based on the information input therein, implements only those settings on the printing press and/or initiates or suggests only those process steps that are necessary for the subsequent pass of the sheets that have already been printed.

IPC Classes  ?

• G06F 3/12 - Digital output to print unit
• B41F 33/16 - Programming systems for automatic control of sequence of operations
• B41F 33/00 - Indicating, counting, warning, control or safety devices
• B41F 33/12 - Tripping devices or stop-motions for starting or stopping the machine as a whole

Abstract

A printing press includes a roller having a first antifriction bearing and a second antifriction bearing. The first antifriction bearing has rolling bodies, a first ring and a second ring. One of the two rings forms an outer ring and the other of the two rings forms an inner ring. Roller sockets are configured as quick action changing devices for receiving the anti-friction bearings during insertion of the roller into the printing press. The first antifriction bearing is configured as an axial floating bearing with a considerable axial movement play of the rolling bodies between the latter and one of the rings. The second antifriction bearing is configured as an axial locating bearing without such a considerable axial movement play. A centering device centers one of the rings relative to the other.

IPC Classes  ?

• F16C 43/04 - Assembling rolling contact bearings
• B41L 5/16 - Accessories, e.g. drawers for storing forms, for money

Abstract

A film transfer unit is provided on an inking unit of a printing unit. If such a film transfer unit includes an intermittent drive device having dancers then, as a result, access to an ink fountain or an inking unit is generally rather restricted. Adjustable guide elements of the intermittent drive device are provided in a frame of an intermittent drive module which can be pushed, in the form of a cassette, out of an opening of the film transfer unit when the film transfer unit is not to be used to transfer a transfer layer from a transfer film to a printing material, so that an installation space which has thus become free can be used to operate an ink fountain of the inking unit. A cassette for a film transfer apparatus and a method for operating a film transfer apparatus, are also provided.

IPC Classes  ?

• B29C 65/56 - Joining of preformed partsApparatus therefor using mechanical means
• B32B 37/10 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using direct action of vacuum or fluid pressure
• B32B 37/26 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the laminating process, e.g. release layers or pressure equalising layers
• B32B 38/14 - Printing or colouring
• B32B 41/00 - Arrangements for controlling or monitoring lamination processesSafety arrangements
• B32B 37/06 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
• B32B 37/30 - Partial laminating

Abstract

An apparatus and a method for correct phase engagement of mechanically coupled rotatably drivable components in printing material processing machines, include a coupling for mechanically connecting at least two of the rotatably drivable components. The at least two rotatably drivable components are operated at a different rotational speed in a transmission ratio in a mechanically coupled state, and a control computer has access to the transmission ratio for controlling an engagement operation and taking the transmission ratio into consideration during the correct phase engagement.

IPC Classes  ?

• B41F 33/00 - Indicating, counting, warning, control or safety devices
• B41F 5/00 - Rotary letterpress machines
• B41F 5/04 - Rotary letterpress machines for printing on webs
• B41F 13/008 - Mechanical features of drives, e.g. gears, clutches
• B41F 13/004 - Electric or hydraulic features of drives
• B41F 31/00 - Inking arrangements or devices

Abstract

A display device and a display method are provided for printing material processing machines having components disposed relative to a printing material. The display device and method are configured in such a way that changes in a relative position of the components of the machine are displayed on the display device in relation to the printed image and/or the printing material. A printing press having a display device is also provided.

IPC Classes  ?

• B41F 33/02 - Arrangements of indicating devices, e.g. counters

Abstract

A device for feeding printing plates to a plate cylinder in a printing press includes a pivotable guide element. The pivotable guide element has pivotable guide members which are in contact with an image side of the printing plate when the printing plate is being fed to the plate cylinder. These pivotable guide members are disposed in such a way that they can be disengaged from the printing plate when the printing plate is being wrapped around the plate cylinder. A sheet-fed rotary printing press having the device, is also provided.

IPC Classes  ?

• B41F 27/12 - Devices for attaching printing elements or formes to supports for attaching flexible printing formes
• B41F 5/00 - Rotary letterpress machines

Abstract

A method and an apparatus for turning a sheet during its transport through a printing press permit improved printing results as a result of improved sheet guidance. A sheet is tautened following a transfer from a first transport device to a second transport device.

IPC Classes  ?

• B65H 5/02 - Feeding articles separated from pilesFeeding articles to machines by belts or chains
• B65H 29/68 - Reducing the speed of articles as they advance

Abstract

A method of controlling a powder sprayer having a fan jet nozzle configuration in a printing press, includes controlling the fan jet nozzle configuration as a function of operating parameters of the printing press. A printing press having a powder sprayer is also provided.

IPC Classes  ?

• B41F 23/06 - Powdering devices, e.g. for preventing set-off

Abstract

A printing press includes an anilox inking unit with an engraved roller and a doctor-type ink fountain. At least one stirring element projects into the doctor-type ink fountain.

IPC Classes  ?

• B41F 31/03 - Ink agitators
• B41F 31/04 - Ducts, containers, supply or metering devices with duct-blades or like metering devices
• B41F 31/02 - Ducts, containers, supply or metering devices

Abstract

If a plurality of part film webs are each stored on different supply shafts, considerable effort is necessary to use a plurality of part film webs within one apparatus. If the part film webs are stored as a plurality of part film webs on a common supply shaft, various problems can arise. Preferably a plurality of part film webs can be used in an apparatus for the transfer of a transfer layer to a sheet. Ideally, the supply shaft and/or collecting shaft is/are constructed as a friction shaft, so that the transfer of the rotational movement of the friction shaft to the transfer film supply roll and/or transfer film collecting roll is carried out via a frictional connection between shaft and roll, which can be overcome by tensile forces of the transfer film web. Therefore, a plurality of transfer film rolls having different diameters are provided on the friction shaft.

IPC Classes  ?

• B29C 53/82 - Cores or mandrels
• B32B 38/14 - Printing or colouring
• B65C 9/40 - ControlsSafety devices
• B65C 9/42 - Label feed control

Abstract

A device for determining the wear of ink fountain films in an ink fountain has at least one ink metering element and a ductor in a printing press. The ink metering element can be moved in the direction of the ductor. A closed position of the ink metering element with an ink fountain film inserted can be determined, and that deviations from the closed position determined are registered by a sensor and the deviations registered can be supplied to a computer as a basis for determining the wear of the ink fountain film.

IPC Classes  ?

• B41F 1/46 - Inking units using rollers

Abstract

A method and a device combine auxiliary and main stacks in a delivery or feeder of a machine for processing printing materials. The device includes a rake that can be moved in and out between the main and auxiliary stacks by a motor drive. A control computer controls the motor drive of the rake. Different speed profiles are stored in the control computer for the drive of the rake as a function of the printing materials in the stacks. A sheet-fed offset printing press having the device is also provided.

IPC Classes  ?

• B65H 1/26 - Supports or magazines for piles from which articles are to be separated with auxiliary supports to facilitate introduction or renewal of the pile
• B65H 1/30 - Supports or magazines for piles from which articles are to be separated with means for replenishing the pile during continuous separation of articles therefrom
• B65H 3/00 - Separating articles from piles
• B65G 59/00 - De-stacking of articles

Abstract

In a method for controlling the temperature of a press which has an applicator roller and a screen roller, the screen roller has its temperature controlled at different temperatures and the applicator roller has its temperature controlled at a constant temperature. In this manner, the choice of the screen roller temperatures can be set individually for each printing unit depending on the optical ink density values which the operator desires.

IPC Classes  ?

• B41F 31/00 - Inking arrangements or devices