EP0697283B1 - Method for starting a dampening unit of an offset printing press - Google Patents
Method for starting a dampening unit of an offset printing press Download PDFInfo
- Publication number
- EP0697283B1 EP0697283B1 EP95110974A EP95110974A EP0697283B1 EP 0697283 B1 EP0697283 B1 EP 0697283B1 EP 95110974 A EP95110974 A EP 95110974A EP 95110974 A EP95110974 A EP 95110974A EP 0697283 B1 EP0697283 B1 EP 0697283B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- damping
- speed
- dampening
- starting
- 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.)
- Expired - Lifetime
Links
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
- B41F33/04—Tripping devices or stop-motions
- B41F33/10—Tripping devices or stop-motions for starting or stopping operation of damping or inking units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/26—Damping devices using transfer rollers
Definitions
- the invention relates to a method for starting a dampening unit an offset printing machine according to the preamble of claim 1.
- a dampening unit of an offset printing press is known from EP 0 450 155 B1 known in which a dampening roller with respect to the plate cylinder and a dampening roller or an immersion roller on and is stored parkable.
- the dampening roller is from Plate cylinder driven, i.e. both on and off Condition it runs at its peripheral speed.
- the with a dampening box cooperating plunger roller has one own, speed-controllable drive, so that according to the Dampening solution requirements of the printing form at different machine speeds the required amount of dampening solution can be supplied.
- With the dipping roller also acts as an adjustable roller Dosing roller together.
- the dampening roller is used for shorter or longer pressure interruptions both from the plate cylinder and from the plunge roller switched off.
- a small amount of paint particles of the same color is employed leading dampening roller removed from the dip roller and in the dampening solution of the dampening solution box and also the Dosing roller contaminated.
- Color in the moisture metering system can be too Instabilities of dampening and thus also coloring instabilities to lead.
- the dampening system In order to counteract these pressure disturbances, the dampening system must washed frequently, which is time consuming.
- the object of the present invention is therefore a method according to to develop the preamble of claim 1 such that the disadvantages mentioned above can be avoided.
- the dampening roller is turned on to the dampening agent supply with its own drive Dampening roller at such a speed to drive, so that the peripheral speeds at least approximately are the same.
- the dampening agent supplying dampening roller compared to the Dampening roller is avoided that the dampening agent Roller of the dampening roller decreases in color, which leads to malfunctions in the Dosing system can lead.
- the invention Measure also avoided that located on the dampening roller Color layer due to an otherwise existing speed difference Undergoes deformation in the surface area in which the Hire is done. This embossing of the ink layer on the dampening roller can lead to an uneven distribution of dampening solution of the pressure plate, which only take a few revolutions of the machine by equalizing this deformation.
- FIG Invention shows what is known per se Color dampening system of a sheetfed offset printing machine.
- dampening unit shown there is a dampening agent supply Dampening roller 1 designed as a plunger roller and works with one Dampening solution box 2 together in a conventional manner.
- the Dampening roller 1 has a speed controllable, not shown Drive on, so that they can be specified with different Speeds can be driven.
- dampening roller 3 Via a with respect to the plate cylinder 5 and the dampening agent Dampening roller 1 dampening roller 3 can be turned on and off is dampening solution of the clamped on the plate cylinder 5 Pressure plate fed. Also comes across a bridge roller 6 Fountain solution on a first illustrated inking roller 7 of illustrated inking unit.
- the inking and dampening rollers are both together as well as on the plate cylinder 5. This position corresponds so the printing company. In the event of a print interruption or at The inking rollers and also the dampening roller become a stopper 3 turned off from the plate cylinder 5. Also done at this known dampening system the parking of the dampening roller 3 from the dampening solution supplying dampening roller 1. It can be provided the dampening roller 1 to keep running.
- the printing machine When starting again - all rollers are from the plate cylinder 5 turned off - the printing machine is first set to a predetermined one Basic speed increased (for example 3,000 sheets / h). Since the Dampening roller 3 is driven by the plate cylinder 5, it has the same peripheral speed as the plate cylinder 5 on. Before the dampening roller 3 to the dampening agent supply Dampening roller 1 is turned on, driving the dampening roller 1 at a speed such that this with a circumferential speed rotates, which is equal to that of the dampening roller 3 is. As soon as this is the case, the queuing takes place the dampening roller 3 to the dampening roller 1 and also also the line to the plate cylinder 5 (simultaneously or with a time delay). After the adjustment process of the dampening roller 3 to the dampening roller 1, this is then in turn with a Speed driven, which corresponds to the dampening solution needs.
- Basic speed for example 3,000 sheets / h
- the above-described adjustment process of the dampening roller 3 to the dampening roller 1 is by a not shown Control performed.
- the command to start up to basic speed causes the control by specifying a corresponding speed setpoint to the drive of the dampening roller 1 that this with a Speed rotates so that the peripheral speed of the dampening roller 1 is equal to that of the dampening roller 3.
- different basic speeds can be specified (for example freely selectable between 3,000 and 5,000 sheets / h) be provided that the control from the predetermined basic speed the required target speed value for driving the dampening roller 1 calculated.
- the speed setpoint for the drive of the dampening roller 1 can also be tabulated in conjunction with various basic speed values be saved.
- the control ensures that after entering the command for Starting the printing press at basic speed directly Startup of the drive of the dampening roller 1 is initiated.
- the dampening roller is then switched on with a time delay 3 opposite the dampening roller 1 and the plate cylinder 5. By appropriate selection of this time offset it is guaranteed that the drive of the dampening roller 1 this before contact with the Dampening roller 3 has accelerated to the intended speed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Anfahren eines Feuchtwerkes einer Offsetdruckmaschine gemäß dem Oberbegriff von Anspruch 1. The invention relates to a method for starting a dampening unit an offset printing machine according to the preamble of claim 1.
Aus der EP 0 450 155 B1 ist ein Feuchtwerk einer Offsetdruckmaschine bekannt, bei welchem eine Feuchtauftragwalze bezüglich dem Plattenzylinder und einem Feuchtduktor bzw. einer Tauchwalze an- und abstellbar gelagert ist. Die Feuchtauftragwalze wird dabei vom Plattenzylinder her angetrieben, d.h. sowohl im an- als auch abgestellten Zustand läuft sie mit dessen Umfangsgeschwindigkeit. Die mit einem Feuchtmittelkasten zusammenwirkende Tauchwalze weist einen eigenen, drehzahlsteuerbaren Antrieb auf, so daß entsprechend den Feuchtmittelbedürfnissen der Druckform bei unterschiedlichen Maschinendrehzahlen die erforderliche Feuchtmittelmenge zuführbar ist. Mit der Tauchwalze wirkt ferner noch eine bezüglich dieser einstellbare Dosierwalze zusammen. A dampening unit of an offset printing press is known from EP 0 450 155 B1 known in which a dampening roller with respect to the plate cylinder and a dampening roller or an immersion roller on and is stored parkable. The dampening roller is from Plate cylinder driven, i.e. both on and off Condition it runs at its peripheral speed. The with a dampening box cooperating plunger roller has one own, speed-controllable drive, so that according to the Dampening solution requirements of the printing form at different machine speeds the required amount of dampening solution can be supplied. With the dipping roller also acts as an adjustable roller Dosing roller together.
Bei kürzeren oder längeren Druckunterbrechungen wird die Feuchtauftragwalze sowohl vom Plattenzylinder als auch von der Tauchwalze abgestellt. In der Praxis hat sich dabei gezeigt, daß bei jedem Anfahrvorgang, bei welchem die Feuchtauftragwalze an die Tauchwalze angestellt wird eine geringe Menge von Farbpartikeln der auch Farbe führenden Feuchtauftragwalze von der Tauchwalze abgenommen und in das Feuchtmittel des Feuchtmittelkastens gerät und ferner noch die Dosierwalze verunreinigt. Farbe im Feuchtdosiersystem kann aber zu Instabilitäten der Feuchtung und somit auch zu Färbungsinstabilitäten führen. Um diesen Druckstörungen entgegen zu wirken muß das Feuchtwerk häufig gewaschen werden, was zeitaufwendig ist. The dampening roller is used for shorter or longer pressure interruptions both from the plate cylinder and from the plunge roller switched off. In practice, it has been shown that in each Start-up process in which the dampening roller on the dipping roller a small amount of paint particles of the same color is employed leading dampening roller removed from the dip roller and in the dampening solution of the dampening solution box and also the Dosing roller contaminated. Color in the moisture metering system can be too Instabilities of dampening and thus also coloring instabilities to lead. In order to counteract these pressure disturbances, the dampening system must washed frequently, which is time consuming.
Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren gemäß dem Oberbegriff von Anspruch 1 derartig weiterzubilden, so daß die voranstehend genannten Nachteile vermieden werden können. The object of the present invention is therefore a method according to to develop the preamble of claim 1 such that the disadvantages mentioned above can be avoided.
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen. This task is solved by the characteristic features of Claim 1. Further developments of the invention result from the Subclaims.
Gemäß der Erfindung ist vorgesehen, vor dem Anstellen der Feuchtauftragwalze an die mit einem eigenen Antrieb versehene feuchtmittelzuführende Feuchtwerkwalze diese mit einer derartigen Drehzahl anzutreiben, so daß die Umfangsgeschwindigkeiten wenigstens annähernd gleich sind. Durch ein derartiges Synchronisieren der Umfangsgeschwindigkeiten der feuchtmittelzuführenden Feuchtwerkwalze gegenüber der Feuchtauftragwalze wird vermieden, daß die feuchtmittelzuführende Walze von der Feuchtauftragwalze Farbe abnimmt, was zu Störungen im Feuchtdosiersystem führen kann. Ferner wird durch die erfindungsgemäße Maßnahme auch vermieden, daß die auf der Feuchtauftragwalze befindliche Farbschicht durch eine sonst vorhandene Drehzahldifferenz eine Deformation in demjenigen Oberflächenbereich erfährt, in welchem das Anstellen erfolgt. Diese Einprägung der Farbschicht auf der Feuchtauftragwalze kann zu einer ungleichmäßigen Feuchtmittelverteilung auf der Druckplatte führen, welche sich erst nach einigen Maschinenumdrehungen durch Egalisieren dieser Deformation wieder abbaut. According to the invention it is provided before the dampening roller is turned on to the dampening agent supply with its own drive Dampening roller at such a speed to drive, so that the peripheral speeds at least approximately are the same. By synchronizing the peripheral speeds in this way the dampening agent supplying dampening roller compared to the Dampening roller is avoided that the dampening agent Roller of the dampening roller decreases in color, which leads to malfunctions in the Dosing system can lead. Furthermore, by the invention Measure also avoided that located on the dampening roller Color layer due to an otherwise existing speed difference Undergoes deformation in the surface area in which the Hire is done. This embossing of the ink layer on the dampening roller can lead to an uneven distribution of dampening solution of the pressure plate, which only take a few revolutions of the machine by equalizing this deformation.
Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der einzigen Figur. Diese zeigt ein an sich bekanntes Farb-Feuchtwerk einer Bogenoffsetdruckmaschine. Furthermore, an embodiment of FIG Invention based on the single figure. This shows what is known per se Color dampening system of a sheetfed offset printing machine.
In dem dargestellten Feuchtwerk ist eine feuchtmittelzuführende Feuchtwerkwalze 1 als Tauchwalze ausgebildet und wirkt mit einem Feuchtmittelkasten 2 in an sich bekannter Weise zusammen. Die Feuchtwerkwalze 1 weist einen nicht dargestellten, drehzahlsteuerbaren Antrieb auf, so daß sie mit unterschiedlichen, vorgebbaren Drehzahlen antreibbar ist. Mit der Feuchtwerkwalze 1 wirkt eine Dosierwalze 4 zusammen, welche von der Feuchtwerkwalze 1 angetrieben wird. In the dampening unit shown there is a dampening agent supply Dampening roller 1 designed as a plunger roller and works with one Dampening solution box 2 together in a conventional manner. The Dampening roller 1 has a speed controllable, not shown Drive on, so that they can be specified with different Speeds can be driven. One works with the dampening roller 1 Metering roller 4 together, which is driven by the dampening roller 1 becomes.
Über eine bezüglich dem Plattenzylinder 5 und der feuchtmittelzuführenden Feuchtwerkwalze 1 an- und abstellbare Feuchtauftragwalze 3 wird Feuchtmittel der auf dem Plattenzylinder 5 aufgespannten Druckplatte zugeführt. Über eine Brückenwalze 6 gelangt ebenfalls Feuchtmittel auf eine erste dargestellte Farbauftragwalze 7 des dargestellten Farbwerkes. Via a with respect to the plate cylinder 5 and the dampening agent Dampening roller 1 dampening roller 3 can be turned on and off is dampening solution of the clamped on the plate cylinder 5 Pressure plate fed. Also comes across a bridge roller 6 Fountain solution on a first illustrated inking roller 7 of illustrated inking unit.
In der Figur sind die Farb- und Feuchtwerkwalzen sowohl aneinander als auch an dem Plattenzylinder 5 angestellt. Diese Stellung entspricht also dem Druckbetrieb. Bei einer Druckunterbrechung bzw. bei einem Stopper werden die Farbauftragwalzen und auch die Feuchtauftragwalze 3 vom Plattenzylinder 5 abgestellt. Ebenfalls erfolgt bei diesem bekannten Feuchtwerk das Abstellen der Feuchtauftragwalze 3 von der feuchtmittelzuführenden Feuchtwerkwalze 1. Es kann vorgesehen sein, während der gesamten Druckunterbrechung die Feuchtwerkswalze 1 weiterlaufen zu lassen. In the figure, the inking and dampening rollers are both together as well as on the plate cylinder 5. This position corresponds so the printing company. In the event of a print interruption or at The inking rollers and also the dampening roller become a stopper 3 turned off from the plate cylinder 5. Also done at this known dampening system the parking of the dampening roller 3 from the dampening solution supplying dampening roller 1. It can be provided the dampening roller 1 to keep running.
Beim Wiederanfahren - sämtliche Walzen sind vom Plattenzylinder 5 abgestellt - wird zunächst die Druckmaschine auf eine vorgegebene Grunddrehzahl hochgefahren (beispielsweise 3.000 Bogen/h). Da die Feuchtauftragwalze 3 vom Plattenzylinder 5 her angetrieben ist, weist diese die gleiche Umfangsgeschwindigkeit wie der Plattenzylinder 5 auf. Bevor nun die Feuchtauftragwalze 3 an die feuchtmittelzuführende Feuchtwerkwalze 1 angestellt wird, erfolgt ein Antreiben der Feuchtwerkwalze 1 mit einer Drehzahl derart, so daß diese mit einer Umfangsgeschwindigkeit rotiert, welche gleich der der Feuchtauftragwalze 3 ist. Sobald dies der Fall ist, erfolgt das Anstellen der Feuchtauftragwalze 3 an die Feuchtwerkwalze 1 und ferner auch das Anstellen an den Plattenzylinder 5 (gleichzeitig oder zeitverzögert). Nach dem beschriebenen Anstellvorgang der Feuchtauftragwalze 3 an die Feuchtwerkwalze 1 wird diese dann wiederum mit einer Drehzahl angetrieben, welche den Feuchtmittelbedürfnissen entspricht. When starting again - all rollers are from the plate cylinder 5 turned off - the printing machine is first set to a predetermined one Basic speed increased (for example 3,000 sheets / h). Since the Dampening roller 3 is driven by the plate cylinder 5, it has the same peripheral speed as the plate cylinder 5 on. Before the dampening roller 3 to the dampening agent supply Dampening roller 1 is turned on, driving the dampening roller 1 at a speed such that this with a circumferential speed rotates, which is equal to that of the dampening roller 3 is. As soon as this is the case, the queuing takes place the dampening roller 3 to the dampening roller 1 and also also the line to the plate cylinder 5 (simultaneously or with a time delay). After the adjustment process of the dampening roller 3 to the dampening roller 1, this is then in turn with a Speed driven, which corresponds to the dampening solution needs.
Der voranstehend beschriebene Anstellvorgang der Feuchtauftragwalze 3 an die Feuchtwerkwalze 1 wird durch eine nicht dargestellte Steuerung durchgeführt. Sobald an der Druckmaschine (z.B. Leitstand) das Kommando zum Anfahren auf Grunddrehzahl eingegeben worden ist, bewirkt die Steuerung durch Vorgabe eines entsprechenden Drehzahlsollwertes an den Antrieb der Feuchtwerkwalze 1, daß diese mit einer Drehzahl rotiert, so daß die Umfangsgeschwindigkeit der Feuchtwerkwalze 1 gleich der der Feuchtauftragwalze 3 ist. Wenn bei der Druckmaschine verschiedene Grunddrehzahlen vorgebbar sind (beispielsweise zwischen 3.000 und 5.000 Bogen/h frei wählbar), so kann vorgesehen sein, daß die Steuerung aus der vorgegebenen Grunddrehzahl den nötigen Soll-Drehzahlwert für den Antrieb der Feuchtwerkwalze 1 errechnet. Der Drehzahl-Sollwert für den Antrieb der Feuchtwerkwalze 1 kann auch tabellarisch in Verbindung mit verschiedenen Grunddrehzahlwerten abgespeichert sein. The above-described adjustment process of the dampening roller 3 to the dampening roller 1 is by a not shown Control performed. As soon as on the press (e.g. control station) the command to start up to basic speed has been entered, causes the control by specifying a corresponding speed setpoint to the drive of the dampening roller 1 that this with a Speed rotates so that the peripheral speed of the dampening roller 1 is equal to that of the dampening roller 3. If at the Printing machine different basic speeds can be specified (for example freely selectable between 3,000 and 5,000 sheets / h) be provided that the control from the predetermined basic speed the required target speed value for driving the dampening roller 1 calculated. The speed setpoint for the drive of the dampening roller 1 can also be tabulated in conjunction with various basic speed values be saved.
Durch die Steuerung wird bewirkt, daß nach Eingabe des Kommandos zum Anfahren der Druckmaschine auf Grundgeschwindigkeit direkt das Hochfahren des Antriebs der Feuchtwerkwalze 1 eingeleitet wird. Zeitlich dazu verzögert erfolgt dann das Anstellen der Feuchtauftragwalze 3 gegenüber der Feuchtwerkwalze 1 und dem Plattenzylinder 5. Durch entsprechende Wahl dieses Zeitversatzes ist gewährleistet, daß der Antrieb der Feuchtwerkwalze 1 diese vor dem Kontakt mit der Feuchtauftragwalze 3 auf die vorgesehene Drehzahl beschleunigt hat. The control ensures that after entering the command for Starting the printing press at basic speed directly Startup of the drive of the dampening roller 1 is initiated. The dampening roller is then switched on with a time delay 3 opposite the dampening roller 1 and the plate cylinder 5. By appropriate selection of this time offset it is guaranteed that the drive of the dampening roller 1 this before contact with the Dampening roller 3 has accelerated to the intended speed.
Claims (3)
- Process for starting a damping unit of an offset printing press, particularly an offset sheet printing press, in which a damping applicator roller (3) driven from the printing unit is set against a damping unit roller (1) feeding damping agent driven by its own drive with a preset speed, characterised in that prior to setting the damping applicator roller (3) against the damping agent feeding damping unit roller (1), this is driven with such a speed that the damping unit roller (1) has a peripheral speed which essentially agrees with the peripheral speed of the damping applicator roller (3).
- Method according to Claim 1, characterised in that the speed for driving the damping agent feeding damping unit roller (1) is determined from a pre-choosable basic speed for starting the offset printing press.
- Method according to Claim 1 or 2, characterised in that after input of the command for setting the damping applicator roller (3) against the damping agent feeding damping unit roller (1), this is first accelerated to the envisaged speed and time delayed relative thereto the setting on of the damping applicator roller (3) against the damping agent feeding damping unit roller (1) occurs.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4428887 | 1994-08-18 | ||
| DE4428887A DE4428887C2 (en) | 1994-08-18 | 1994-08-18 | Method for starting a dampening unit of an offset printing press |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0697283A2 EP0697283A2 (en) | 1996-02-21 |
| EP0697283A3 EP0697283A3 (en) | 1996-12-18 |
| EP0697283B1 true EP0697283B1 (en) | 1998-02-18 |
Family
ID=6525724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95110974A Expired - Lifetime EP0697283B1 (en) | 1994-08-18 | 1995-07-13 | Method for starting a dampening unit of an offset printing press |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0697283B1 (en) |
| AT (1) | ATE163278T1 (en) |
| DE (2) | DE4428887C2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1377116A (en) * | 1972-11-30 | 1974-12-11 | Polygraph Leipzig | Dampening devices for off-set printing machines |
| DE2927127A1 (en) * | 1979-07-05 | 1981-01-08 | Grafische Tech Automation | Offset printing press - has moisture application roller gear driven from plate cylinder and bearing against doctor roller |
| GB2082121B (en) * | 1980-08-14 | 1984-11-28 | Komori Printing Mach | Water supply apparatus for printing press |
| DE4011039C2 (en) * | 1990-04-05 | 1996-03-14 | Roland Man Druckmasch | Process for moistening and inking a plate cylinder of a multi-color offset sheet-fed rotary printing press |
-
1994
- 1994-08-18 DE DE4428887A patent/DE4428887C2/en not_active Expired - Fee Related
-
1995
- 1995-07-13 EP EP95110974A patent/EP0697283B1/en not_active Expired - Lifetime
- 1995-07-13 AT AT95110974T patent/ATE163278T1/en not_active IP Right Cessation
- 1995-07-13 DE DE59501462T patent/DE59501462D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE4428887C2 (en) | 1996-07-11 |
| DE59501462D1 (en) | 1998-03-26 |
| ATE163278T1 (en) | 1998-03-15 |
| EP0697283A2 (en) | 1996-02-21 |
| EP0697283A3 (en) | 1996-12-18 |
| DE4428887A1 (en) | 1996-02-22 |
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