EP3882033A1 - Procédé de lavage d'un mécanisme d'encrage d'une machine d'impression - Google Patents

Procédé de lavage d'un mécanisme d'encrage d'une machine d'impression Download PDF

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Publication number
EP3882033A1
EP3882033A1 EP20164113.1A EP20164113A EP3882033A1 EP 3882033 A1 EP3882033 A1 EP 3882033A1 EP 20164113 A EP20164113 A EP 20164113A EP 3882033 A1 EP3882033 A1 EP 3882033A1
Authority
EP
European Patent Office
Prior art keywords
roller
washing
speed
inking unit
detergent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20164113.1A
Other languages
German (de)
English (en)
Other versions
EP3882033B1 (fr
Inventor
Dieter Schaffrath
Bernhard Schwaab
Michael Schwandt
Peter Heiler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to EP20164113.1A priority Critical patent/EP3882033B1/fr
Publication of EP3882033A1 publication Critical patent/EP3882033A1/fr
Application granted granted Critical
Publication of EP3882033B1 publication Critical patent/EP3882033B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/04—Cleaning arrangements or devices for inking rollers

Definitions

  • the present invention relates to a method for washing an inking unit of a printing machine, a washing agent being introduced into the inking unit and a roller of the inking unit being driven only by roller friction.
  • the object of the invention is to specify a further method for washing an inking unit of a printing press.
  • the object is achieved by a method for washing an inking unit of a printing machine, wherein a detergent is introduced into the inking unit and a roller of the inking unit is driven only by roller friction, characterized in that the speed of the roller is monitored by a sensor of a controller and that the introduction of the detergent is reduced or suspended by the control if the control determines that the speed has fallen below a limit value.
  • the advantage of the invention is that this improves the operational reliability of the printing press.
  • a monitoring program can run in the control, which evaluates the values of the speed of the roller and regulates the introduction of the detergent as a function thereof.
  • the monitoring program can regulate the switching of a doctor blade device. It can be provided that a washing program runs in the control and this is only ended by the monitoring program when the monitoring program determines that the washing agent has been sufficiently removed from the inking unit by the doctor blade device.
  • An initialization run of the printing machine can be carried out to compare the speed of the roller and another speed of the printing machine.
  • the limit value can be varied by the controller or an operator as a function of a printing ink and / or the washing agent used and / or another operating condition.
  • the washing program can be selected from various washing programs that are programmed in the control. The progress of the washing program can be displayed on a monitor.
  • a sensor integrated in a roller lock of the roller can be used as the sensor.
  • a capacitive sensor can be used as the sensor.
  • the single figure shows an inking unit with which the method according to the invention is carried out.
  • a printing press comprises an offset printing unit with a printing forme cylinder 10, a dampening unit for applying a dampening solution to the printing forme cylinder 10 and an inking unit for applying the ink to the printing forme cylinder 10.
  • the inking unit includes rollers 3, 7, each of which has a gear over which they are driven. Between the rollers 3, 7 driven in a form-fitting manner, rollers 4, 9, which run along with them and have no gearwheel, are arranged. The rotation of the rollers 4, 9 is frictionally driven by the rollers 3, 7 resting on them.
  • Each roller 4, 9 sits in a roller lock 11, 12, in which a sensor 2, 8 for measuring the Speed of the respective roller 4, 9 is arranged.
  • the sensors 2, 8 are capacitive proximity sensors and detect a rotating component attached to the roller 4, 9 as a marking, for example a pen.
  • the sensors 2, 8 are connected to an electronic controller 5 to which a monitor 13 belongs.
  • the feed device 1 which introduces the detergent into the inking unit when it is washed.
  • the feed device 1 is a spray device and is directed at the gap between the rollers 3 and 4.
  • the detergent introduced into the inking unit forms an emulsion with the residual ink contained therein, which is removed from the inking unit by a doctor blade device 6.
  • the doctor blade device 6 is temporarily held against the roller 7.
  • the feed device 1 and the doctor device 6 are controlled by the controller 5 as a function of a washing program running therein.
  • the washing program is divided into a first section of the prewash and a second section of the main wash.
  • deposits e.g. consisting of pigments, paper fibers, paper coating
  • detergent is introduced into the inking unit at certain intervals of e.g. ten machine revolutions (revolutions of the printing forme cylinder 10), which should be evenly distributed in order to take effect.
  • a pump strokes of a pump supplying the feed device 1 with the detergent can take place.
  • the amount of detergent added during the pre-wash is so small that no problems (dripping, splashing) due to overdosing are to be feared.
  • the doctor blade device 6 is placed against the roller 7 and the detergent is introduced into the inking unit at certain intervals by pumping and spraying.
  • the emulsion that forms is drawn off from the inking unit via the doctor blade device 6.
  • the washing program is ended after a specified number of machine revolutions and pump strokes. Washing processes are also conceivable in which the program sections of the prewash and the main wash are alternately repeated several times.
  • a monitoring program runs in the controller 5, which influences or controls the washing program as a function of the measured values signaled by the sensors 2, 8.
  • the monitoring program contains various limit values for the rotational speeds or for the peripheral speeds of the rollers 4, 9 that correspond to them.
  • This speed limit prevents detergent from repeatedly being sprayed into an incoming roller gap, but not being able to be transported away because there is insufficient transport speed.
  • the program thus monitors whether an actual value of the rotational speed or peripheral speed of the respective roller 4, 9 during washing is greater than or just as large as a predetermined limit value of this rotational speed or peripheral speed.
  • the limit value for the pre-wash is a variable setting value which can be varied to adapt the speed limit to the operational boundary conditions (color used, detergent, roller material). The limit value is preferably between 20% and 40% of the washing speed.
  • the monitoring program also includes a limit value for the main wash program section.
  • a minimum circumferential speed of the rollers 4, 9 must be reached in order for the detergent to be supplied. If the actual value of the circumferential speed of the rollers 4, 9 falls below this limit during washing, the detergent feed is stopped during the main wash and only restarted when the speed is sufficient to transfer the detergent (washing emulsion).
  • the monitoring program monitors the rule as to whether the actual value of the circumferential speed of the respective roller 4, 9 during washing is greater than or equal to the limit value of the circumferential speed of this Roller 4, 9 is in the process of washing.
  • This speed limit prevents detergent from repeatedly being sprayed into the incoming roller gap, but not being able to be transported away, since there is insufficient transport speed. The insufficient transport speed can be caused by insufficient friction due to incorrect contact strip widths or color properties.
  • a third limit value, which the monitoring program contains, is a speed limit for shutting down the washing squeegee.
  • a speed limit for shutting down the washing squeegee In order to ensure a good wash result, there must be no more washing emulsion in the inking unit when it is set down. If, towards the end of the washing process, the speeds (actual values of the circumferential speed during washing) of the measuring rollers (rollers 4, 9) are still below the target speed, it can be assumed that there is still washing emulsion in the inking unit and the friction conditions are still disturbed . In order to ensure that undesired liquid residues are safely removed, the doctor blade device 6 may only be switched off from the roller 7 when the sensors 2, 8 signal that the washing speed is again on the rollers 4, 9 (target value of the circumferential speed during washing) is present.
  • the machine operator In order to be able to set practice-relevant values for the limit speeds in the monitoring program on the control 5, the machine operator has the monitor 13 available as a display, which shows him the conditions present in the inking unit. A graphic is displayed to the operator on the screen of the control point, which shows the course of the roller speed at the measuring points and sets this in relation to the set limit values. Various values are displayed on the screen for information, including the current program section, the target washing time and the remaining washing time of the current washing program.
  • the control system automatically suspends the introduction of detergent, the following values are displayed: The additional time extension of the washing program and the number of detergent feeds that have been suspended up to now (pump strokes). If the course of the roller speed remains noticeably long below the speed limit, then the operator can use the information and visualizations available to him to take appropriate measures to improve the washing process.
  • the possible measures can include, for example: Adjust the degree of wetness of the program (vary the interval of the pump strokes), check the suitability of the detergent, check the roller adjustment, check the condition of the roller surfaces and check the function of the squeegee device 6.
  • the operator determines that the limit value has been selected too low, he can increase it in order to bring about better detergent distribution and improved removal by stopping the detergent supply earlier or earlier.
  • the rollers 4, 9 are rubber-covered rollers, the diameter of which can be different within the scope of the manufacturing tolerances and can change as a result of operation.
  • the diameter can change due to the aging and wear of the roller 4, 9. Both enlargements (swelling) and reductions (shrinkage) can occur.
  • the changes can be up to ⁇ 5% and are therefore relevant for the evaluation of the limit values by the monitoring program, in particular with regard to the query as to whether the target value of the circumferential speed of the roller 4, 9 has been reached again during washing and therefore the doctor blade device 6 of the roller 7 can be turned off again. When the target value is reached, this means that the slip has been sufficiently reduced and the washing emulsion has thus been sufficiently removed from the inking unit.
  • the longer circumferential development reduces the measured roller speed.
  • the roller 4, 9 runs without slipping, the difference between its measured speed (or the corresponding peripheral speed) and the nominal value of the peripheral speed during washing is evaluated as lag or slip.
  • the controller 5 carries out an initialization run at certain time intervals according to the program, in which the true speed of the rollers 4, 9 is determined in relation to the machine speed and automatically stored. The coincidence of the roller speed must be within specified tolerances in order to ensure synchronization that is sufficiently accurate in practice.
EP20164113.1A 2020-03-19 2020-03-19 Procédé de lavage d'un mécanisme d'encrage d'une machine d'impression Active EP3882033B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20164113.1A EP3882033B1 (fr) 2020-03-19 2020-03-19 Procédé de lavage d'un mécanisme d'encrage d'une machine d'impression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20164113.1A EP3882033B1 (fr) 2020-03-19 2020-03-19 Procédé de lavage d'un mécanisme d'encrage d'une machine d'impression

Publications (2)

Publication Number Publication Date
EP3882033A1 true EP3882033A1 (fr) 2021-09-22
EP3882033B1 EP3882033B1 (fr) 2022-03-30

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EP20164113.1A Active EP3882033B1 (fr) 2020-03-19 2020-03-19 Procédé de lavage d'un mécanisme d'encrage d'une machine d'impression

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EP (1) EP3882033B1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69307116T2 (de) 1992-12-28 1997-04-17 Sakurai Graphic Systems Corp Vorrichtung zum Reinigen von Farbwalzen in einer Druckmaschine
EP0951995A1 (fr) * 1998-04-23 1999-10-27 MAN Roland Druckmaschinen AG Dispositif d'encrage pour une machine d'impression offset pour feuilles
JP2009202472A (ja) * 2008-02-28 2009-09-10 Mitsubishi Heavy Ind Ltd 印刷機のローラ装置及び印刷機並びに印刷機の洗浄方法
EP1441908B1 (fr) 2001-11-06 2009-10-14 Baldwin Germany GmbH Procede et dispositif de nettoyage de cylindres d'une presse a imprimer
DE102013213059A1 (de) 2012-07-06 2014-01-09 Koenig & Bauer Aktiengesellschaft Vorrichtung und Verfahren zum Aufbringen und Dosieren von Reinigungsflüssigkeit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69307116T2 (de) 1992-12-28 1997-04-17 Sakurai Graphic Systems Corp Vorrichtung zum Reinigen von Farbwalzen in einer Druckmaschine
EP0951995A1 (fr) * 1998-04-23 1999-10-27 MAN Roland Druckmaschinen AG Dispositif d'encrage pour une machine d'impression offset pour feuilles
EP1441908B1 (fr) 2001-11-06 2009-10-14 Baldwin Germany GmbH Procede et dispositif de nettoyage de cylindres d'une presse a imprimer
JP2009202472A (ja) * 2008-02-28 2009-09-10 Mitsubishi Heavy Ind Ltd 印刷機のローラ装置及び印刷機並びに印刷機の洗浄方法
DE102013213059A1 (de) 2012-07-06 2014-01-09 Koenig & Bauer Aktiengesellschaft Vorrichtung und Verfahren zum Aufbringen und Dosieren von Reinigungsflüssigkeit

Also Published As

Publication number Publication date
EP3882033B1 (fr) 2022-03-30

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