Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F33/00—Indicating, counting, warning, control or safety devices
  • B41F33/0009—Central control units
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/02—Ducts, containers, supply or metering devices
  • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
  • B41F31/045—Remote control of the duct keys

Definitions

• control devices which contain a cassette drive, with the aid of which the setting values for the actuators for the ink layer thickness profile, which the printer has set by means of the control device on the printing press when a specific print job has been carried out, are written onto a magnetic tape so that this data available later for a repeat job. If the data stored on the magnetic tape cassette is read back into the control device after interim execution of other print jobs, the actuators for the ink layer thickness profile are reset by this data or information, so that no time-consuming tests are necessary to find the correct setting of the ink layer thickness profile.
• the magnetic tape cassette described with the data is only suitable for resetting the same printing press, the data of which had originally been recorded, if need be, a technically completely identical printing press can be preset using the same cassette.
• the invention has for its object to provide a way that the relevant information for the setting to be made, which can be communicated to the control device in any way, for example by a cable from a mainframe or by a memory transportable by the printer, such as the one mentioned Magnetic tape cassette, can be used for different printing machines.
• the digital information is area coverage values that have been determined, for example, by an optical sheet measuring device from a technically flawlessly printed sheet or by a plate measuring device based on a finished printing plate, these cannot be used directly as setting values, but must first be converted into setting values.
• the digital information is information that is characteristic of the setting values of a reference offset printing press, then this information can be used directly by the reference printing press mentioned to set the machine, by a printing press that is used by the Technically deviates from the reference printing machine, however, this information can only be used after a conversion, which is carried out by the computing device. It is advantageous to design the computing device so that it enables both the conversion of the area coverage values and the conversion of the information characteristic of the setting. In this fold, the computing device must somehow be informed of what type of information is being supplied to it.
• the information about the area coverage value ie the information about the color requirement for the individual printing inks in each individual zone when a single print is carried out, can be communicated to the computing device in different ways.
• the digital information can directly indicate the color requirement for the individual zones.
• the digital information preferably contains data about the area coverage of the individual zone for each color and also an indication of the format to be printed, the print length being of particular interest here.
• the area coverage is the proportion of the printing area of a color zone in comparison to the total area of the color zones. This value of the area coverage, taking into account the width of the ink zone and the length of the ink zone, namely the print length, gives the ink requirement.
• the information about the format does not necessarily have to be communicated to the computing device in the same way as the area coverage values, in particular, this information about the format does not necessarily have to be present on a data carrier containing the area coverage values, although this is very advantageous, but the Format information could also be communicated directly to the computing device by the printer using a keyboard.
• the data is standardized, regardless of which printing press is to be set by means of the data stored on magnetic tape, it is also possible that the storage of the data on the magnetic tape cassette does not necessarily have to take place within the operation of the printing house , in which the printing press is located, but this storage of data could also be carried out by a technical office that measures print templates using optical measuring devices and from the measured values determined either the above-mentioned information about the area coverage value and / or data about the setting values for the reference offset - Printing machine, which serves as the basis for the standard, is calculated and then saved on the magnetic tape. It is by no means necessary for the reference printing press mentioned to be an actually existing printing press, but it can also be an imaginary printing press with fixed technical properties that is not actually manufactured by a printing press manufacturer.
• the reference offset printing press which serves as the basis for the standard can, in particular, be the largest machine within a machine program of a manufacturer if it is an actually existing machine. If, as already stated above and as is provided according to an embodiment of the invention, it is a machine that does not belong to the printing presses to be controlled according to the invention, the advantage lies in the fact that the technical data on which the standardization is based lying, can be maintained, even if changes are made to the printing press due to technical developments.
• control device has a device which recognizes from the supplied digital information whether it is data designating the area coverage value or setting values for the reference printing press.
• the control device has a device which recognizes whether it is connected to a sheet-fed printing press or a web-fed printing press.
• a device which recognizes whether it is connected to a sheet-fed printing press or a web-fed printing press.
• the computing device can adjust the zone correctly Do this by swapping the assignment of setting data to the zones of certain printing units in mirror image.
• the color demand information replaced by the setting value information is overwritten.
• the color requirement information originally present on the data carrier may relate, for example, to four printing colors (black, magenta, cyan, yellow).
• the printing press is a printing press with only two printing units, which initially only prints the colors black and cyan in a first pass. After the data has been entered into the control device and the control device has determined from these setting values for the connected machine, the printer may have changed these setting values on the basis of his experience and observation of the printing result.
• a portable digital memory in particular a magnetic tape cassette known per se, is used, the data transport for the printer becomes very simple and clear, and the data can be accessed very easily for individual print jobs.
• a system is provided with a plurality of offset printing presses which differ technically from one another, between which the data for the setting values can be exchanged in the manner just described.
• the aim is to remove the same amount of ink from the ink fountain per revolution of the plate cylinder, both for the reference machine on which the standardization is based and for the machine actually used.
• the aim here is that the setting of the ink gap thicknesses, that is, the setting of the ink layer thickness profile, is changed as little as possible if nonlinearities are to be expected during the adjustment. In this case, the conversion is carried out as far as possible in such a way that the ductor stroke assumes a suitable value.
• the corresponding mean color saturation during printing can be produced for a single color with a medium area coverage by choosing the ductor stroke to be very small and accordingly making the ink gap thickness relatively large, or by making the ink gap thickness relatively small is and accordingly the ink duct stroke relatively large, so that in both cases the same amount of ink is fed to the inking unit of the printing press per revolution of the plate cylinder.
• the ductor stroke to be very small and accordingly making the ink gap thickness relatively large, or by making the ink gap thickness relatively small is and accordingly the ink duct stroke relatively large, so that in both cases the same amount of ink is fed to the inking unit of the printing press per revolution of the plate cylinder.
• a large number of intermediate positions are possible.
• the duct stroke or the ink gap thickness can generally no longer meet the above-mentioned limit values, so that the possible variations are reduced.
• the algorithm entered into the computing device determines from the possible extreme positions that are conceivable for each individual ink zone, the extreme positions that are possible when considering all ink zones of a printing group, and then adjusts the ductor stroke and the ink gap thickness so that neither the ductor stroke nor the ink gap thickness of any zone exceeds empirically defined limit values.
• the device is expediently designed in such a way that, when an approach to the above-mentioned limits occurs, which falls below a predetermined level, it emits a warning signal so that the printer can check what the approximation to the limit value is and possibly can take countermeasures.
• the lifter cycle indicates how often the ink lifter performs its oscillating movement between the ink duct and the first roller of the inking unit. With the HD 102 machine, the paint lifter executes 0.5 movement cycles per machine revolution, or one full movement cycle with two machine revolutions.
• control device therefore contains a device for recognizing the number of ink zones of the connected printing press.
• the largest machine namely the one with the largest maximum printing length of 690 mm
• the machine HD 102 is provided as the standard basis.
• control device which is used, for example, to control a printing press of the MO type
• digital data is supplied from a magnetic tape cassette, which are identified as setting values by a data word stored on the cassette, with these setting values in percent immediately for the If machine HD 102 could be used, these setting values, which characterize the duct stroke, must be multiplied by a factor of 1.345 for machine MO so that they can be used as setting values for machine MO.
• the computing device carries out the following calculation process for each individual color zone: the area coverage is determined by the format length of the format to be printed multiplied and divided by the maximum print length of the HD 102 machine of 690 mm. This results in the area coverage for which the ink supply would have to be dimensioned for this special zone in the HD 102 machine, so that the format could be printed with the desired color saturation in a plate cylinder revolution.
• the machines specified in Table 1 have essentially the same construction for setting the ink layer thickness profile, namely actuating cylinders of 32 mm in length driven by servomotors. Apart from their width, the technical properties of the ink fountains of all the machines mentioned are the same.
• Another advantage of the invention lies in the fact that for printing on web presses the printing can take place on sheet-fed machines and the setting data determined thereby and transferred to the magnetic tape cassette can be used to set the web presses by means of the cassette.

Landscapes

• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Rotary Presses (AREA)
• Control Of Transmission Device (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Fluid-Driven Valves (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6164868

Family Applications (1)

Country Status (9)

Cited By (2)

Families Citing this family (5)

Family Cites Families (6)

• 1982
  • 1982-05-29 DE DE19823220377 patent/DE3220377A1/de active Granted
• 1983
  • 1983-05-03 ZA ZA833151A patent/ZA833151B/xx unknown
  • 1983-05-04 ES ES522084A patent/ES8402207A1/es not_active Expired
  • 1983-05-17 EP EP83104826A patent/EP0095648B1/de not_active Expired
  • 1983-05-17 DE DE8383104826T patent/DE3380766D1/de not_active Expired
  • 1983-05-19 AU AU14697/83A patent/AU570203B2/en not_active Ceased
  • 1983-05-24 CA CA000428728A patent/CA1224668A/en not_active Expired
  • 1983-05-26 DK DK236983A patent/DK236983A/da not_active Application Discontinuation
  • 1983-05-27 NO NO831905A patent/NO831905L/no unknown
  • 1983-05-30 JP JP58094236A patent/JPS58219059A/ja active Granted

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