EP0095652A2 - Dispositif de réglage du mouillage en fonction du profil d'encrage - Google Patents
Dispositif de réglage du mouillage en fonction du profil d'encrage Download PDFInfo
- Publication number
- EP0095652A2 EP0095652A2 EP83104846A EP83104846A EP0095652A2 EP 0095652 A2 EP0095652 A2 EP 0095652A2 EP 83104846 A EP83104846 A EP 83104846A EP 83104846 A EP83104846 A EP 83104846A EP 0095652 A2 EP0095652 A2 EP 0095652A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- inking
- dampening
- measuring
- ink
- 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
Links
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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
- B41F33/0054—Devices for controlling dampening
-
- 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
Definitions
- the invention relates to a device for ink profile-dependent dampening solution control in an offset printing unit with an ink dampening unit, which supplies a dampening film of the same thickness to the plate cylinder and the inking unit over the width of the printing form.
- the correct quantity ratio of dampening fluid and color on the offset printing plate has a significant influence on the print quality that can be achieved with offset printing units. If, for example, the fountain solution requirement exceeds the fountain solution supply, this is noticeable on the printed image by "toning" or "smearing". On the other hand, if the plate is over-moistened, water marks appear. The balanced ratio between ink and fountain solution supply is therefore within this lubrication and water mark limit.
- the color requirement of a printed image depends on the respective color area coverage. This fact is taken into account by zonal regulation of the ink supply.
- the dampening solution is fed across the entire width of the plate using a thin, uniform film. According to the color profile, however, the plate also needs more water locally than in other places.
- One helps oneself by supplying a quantity of fountain solution averaged over all image areas and builds on the fact that a fountain solution emulsion is formed in the inking unit, which creates the necessary compensation.
- DE-OS 29 31 579 discloses a device for zonal regulation of the dampening solution guidance over the width of the printing form of an offset printing machine with actuators for zone-wise ink metering, the actuators for zone-wise ink metering being assigned zonal actuators for the dampening solution guidance and coupled to one another are, and with the inclusion of an adapter in its transmission characteristic that takes into account the parameters influencing the zonal ink / fountain solution balance.
- the object of the invention is to achieve the same ink-water emulsion as possible, regardless of the color profile and local heating, seen across the machine width. However, this should not unnecessarily complicate the start-up conditions, but should have a positive impact.
- a hydrophilic measuring roller is provided which is connected to one of the inking unit rollers, that a measuring device is arranged in the area of the measuring roller, which determines the wetting of the measuring roller jacket in sections over the entire width of the measuring roller, and that a special device for section changes tion of the proportion of the dampening solution in the ink film is provided and that a control part converts the measurement signals of the measuring device into control commands and gives up the device for section-wise changing the proportion of the dampening solution in the ink film.
- the idea of the invention can be realized in two ways. Once you can drive little water, i.e. cover the minimum requirement and supply enough dampening water that the lubrication limit is not reached under normal circumstances. With this dampening method, ink acceptance will occur in such sections on the hydrophilic measuring roller and will then be measured by the sensors of the measuring device, in which too little dampening water is supplied locally due to the highest elevations of the color profile. The additional dampening then takes place automatically at these points.
- the other way to realize the idea of the invention is to drive a lot of water, i.e. to move just below the water mark limit with the fountain solution supply.
- dampening water will accumulate on the hydrophilic measuring roller, the lateral surface of which has the same conditions as the plate, in those sections in which over-humidification has occurred due to the valleys of the color profile.
- This over-moistening can be eliminated by doctoring. If the hydrophilic measuring roller is also cooled, the section-wise imbalance between the ink and fountain solution supply will show up faster than on the plate and can thus be eliminated in good time.
- the device according to the invention considerably increases the tolerance range between the lubrication and the watermark limit by adapting the dampening solution supply to the color profile.
- the starting conditions are improved.
- the optimal continuation printing conditions can be brought about with the device according to the invention in an extremely short time because, for example, with the aid of the additional dampening device, a very rapid saturation of the inking unit with dampening water can be carried out. It is therefore only necessary to pre-moisten the plate in order to be able to press the machine.
- a color-water balance can be established very quickly by using the means of over-humidification, which is harmless because the supersaturation which may initially appear supply of the inking unit with dampening water can be rendered harmless by scraping on all sections.
- the invention therefore not only extends the tolerance range between the lubrication and water mark limits, but also noticeably improves the starting conditions.
- the inking unit according to FIG. 1 consists of an ink fountain 1 with ink fountain roller 2, the subsequent ink lifter 3, which supplies 2 ink to a first ink rubbing cylinder 4 from the ink fountain roller.
- the first ink rubbing cylinder 4 is connected to a second ink rubbing cylinder 6 via a rubber roller 5. This latter also has contact with the distributor roller 7 and the inking unit roller 8. Both of the latter inking unit rollers 7 and 8 are in contact with the third inking cylinder 9, which feeds the first two inking rollers 10 and 11 with ink.
- the second strand of the inking unit branches off from the distributor roller 7 in the form of four inking unit rollers 12, the last of which rests in the chain on the fourth inking cylinder 13, which feeds the last two inking rollers 14 and 15 with ink.
- the inking rollers 11 and 14 are connected via a rider roller 16.
- An intermediate roller 17 also forms a bridge between the first pure inking roller 10 and the fountain solution inking roller 18, which is supplied with fountain solution via a metering roller 19 by the immersion roller 21 immersed in the fountain solution tank 20.
- a fountain roller 22 which converges with the ink fountain roller 18 ensures uniformity of the fountain film.
- inking roller 8 connecting the second and third ink rubbing cylinders 6 and 9 has a hydrophilic measuring roller, namely a chrome measuring roller 23 K-on
- a series of sensors 24 of a measuring device 29 are arranged at regular intervals parallel to this chrome measuring roller 23. They are electrically connected to an electronic control part 25.
- a series of dampening water application units 26 of an additional dampening unit 33 are also provided parallel to the second ink rubbing cylinder 6 at equal distances from one another.
- These fountain solution application units 26 can be designed as ultrasonic atomizers. They are electrically connected to the electronic control part 25 mentioned above.
- the fountain solution application units 26 of the additional fountain arrangement 33 are supplied with fountain solution by a pump 27 which removes the fountain solution from the fountain case 20.
- the five application rollers 18, 10, 11, 14 and 15 are arranged so that they can be removed from the plate cylinder 28.
- dampening water is conveyed directly into the inking unit 34 by the intermediate roller 17, and on the other hand, ink is also supplied to the ink dampening roller 18.
- the dampening unit 35 promotes a uniform dampening film on the plate and in the inking unit 34 in such a way that certain critical points on the printed image, for example non-printing edges, are close to the smear limit with regard to the composition of the ink / water emulsion.
- the chrome measuring roller 23 normally runs bare due to the hydrophilic character of its surface with sufficient water supply of the inking roller 8, it will take on color at the places where the ink / water emulsion contains too little water.
- the sensors 24 of the measuring device 29 measuring at these points detect a surface fault and send a corresponding measuring signal to the electronic control unit 25, which converts this measuring signal into an actuating command and the assigned or the assigned dampening water application units 26 of the additional dampening unit 33 cause 6 dampening water to be sprayed onto the lateral surface of the second inking cylinder as long as the control unit 25 issues corresponding control commands.
- the pump 27 ensures that the working fountain solution application units 26, for example ultrasonic atomizers, are constantly supplied with fountain solution.
- the control unit 25 no longer sends any control commands to the corresponding dampening agent application units 26. and the spraying of dampening water in sections is stopped.
- This spraying in sections before dampening water can take place continuously or periodically, depending on how the sensors 24 report the need to the measuring device. In this way it can be achieved that, seen across the entire width of the machine, the fountain solution emulsion which forms in the inking unit always has approximately the same composition.
- a section-wise lack of dampening water will show up earlier on the inking roller 8 and thus on the chrome measuring roller 23 than on the plate of the plate cylinder 28 because the dampening water is fed directly to the former.
- the evaporation caused by heat in the inking unit ensures that an insufficient amount of dampening water on the chrome measuring roller 23 causes "smearing" earlier than on the plate. Therefore, because of the plate-like surface conditions on the chrome measuring roller 23, it can be recognized prematurely where the lubrication limit on the plate would be reached if the dampening system was not immediately supplied to the inking unit 34 at the endangered sections.
- a quick ink fountain equilibrium can be achieved in the inking unit 34 by briefly adding 33 dampening water to the inking unit 34 from all fountain unit application units 26 of the additional dampening unit. After a brief pre-wetting of the plate on the plate cylinder 28, the continuous printing condition, i.e. produce the desired even fountain solution very quickly across the entire width of the inking unit.
- the inking unit 34 according to the embodiment of the invention according to FIG. 2 differs only slightly from what has been described above, apart from the different arrangement of some rider rollers.
- this inking roller 8 is fed a fountain solution emulsion which is constantly saturated with fountain solution.
- the metering roller 19 is designed here as a lifter and the fountain roller 22 is located directly in the fountain flow. From the dipping roller 21, the metering roller 19, which, as noted above, is a lifter, takes on dampening water and feeds it to the dampening cylinder 22, which supplies the dampening water to the ink dampness water application roller 18 emits.
- a chromium measuring roller 23 also works together with the inking roller 8 and is connected to a cooling device, not shown. Beneath the chrome measuring roller 23, sensors 24 of a measuring device 29 extend parallel thereto. They are electrically connected to the electronic control part 25. This in turn gives up its control commands to an actuating device 30, which controls a fountain solution doctor 31. It consists of a series of doctor sections 32 which are arranged along the chrome measuring roller 23 in such a way that they can be placed by the adjusting device 30 individually or in groups against the outer surface of the chrome measuring roller 23 or can be switched off by the latter. The individual doctor sections 32 preferably consist of a suction belt.
- a printing unit with an ink fountain according to Fig. 2 can be operated with a relatively high supply of fountain solution, i.e. the fountain solution can be supplied in such a way that in certain valleys of the color profile the fountain solution emulsion leads to a too high percentage of fountain solution, so that there is a risk of occurrence of water marks in these sections of the printed image.
- the cooled chrome measuring roller 23 will carry more dampening water in these sections than in other sections, so that the sensors 24 give corresponding measurement signals to the control part 25 and the latter convert converted control commands to the Actuating device 30 sends the doctor blade sections 32 assigned to the reporting sensors 24 against the outer surface of the chrome measuring roller 23 and doctoring off the superfluous fountain solution.
- the doctoring in sections ensures that the ink fountain solution emulsion has approximately the same composition in all areas of the ink profile.
- FIG. 3 A simplified form of doctor blade sections 32 is shown in FIG. 3. Above the chrome measuring roller 23 according to FIG rere pivoting lever 3 is provided, which have a suction surface 38 at their end facing the jacket of the chrome measuring roller 23. From an adjusting device, not shown, these pivoting levers 137 can be set against the chrome measuring roller 23 or pivoted away from the latter. The suction surface 38 is so receptive that it is able to scrape off excess dampening solution over a longer period of time.
- Sensors 24 and associated swivel levers 37 can be arranged to be laterally adjustable. In the best case, only sensors 24 and swivel lever 3 are required for the pressure-free edges, because these plate areas are most susceptible to over-moisture.
- the dampening water application units 26 can also be adjustably attached parallel to the inking roller 8, the dampening water profile of which is to be changed in sections if necessary.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3220701 | 1982-06-02 | ||
| DE19823220701 DE3220701C3 (de) | 1982-06-02 | 1982-06-02 | Vorrichtung zur Feuchtmittelführung bei einem Offsetdruckwerk |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0095652A2 true EP0095652A2 (fr) | 1983-12-07 |
| EP0095652A3 EP0095652A3 (en) | 1984-07-25 |
| EP0095652B1 EP0095652B1 (fr) | 1986-09-03 |
Family
ID=6165063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83104846A Expired EP0095652B1 (fr) | 1982-06-02 | 1983-05-17 | Dispositif de réglage du mouillage en fonction du profil d'encrage |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4485737A (fr) |
| EP (1) | EP0095652B1 (fr) |
| JP (1) | JPS58219053A (fr) |
| AT (1) | AT389675B (fr) |
| CA (1) | CA1209856A (fr) |
| ES (1) | ES522818A0 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332698A (zh) * | 2007-06-28 | 2008-12-31 | 海德堡印刷机械股份公司 | 用于在印刷时确定感脂极限的测量区 |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6184247A (ja) * | 1984-10-02 | 1986-04-28 | Tekunoroole Kk | オフセツト印刷機におけるダンプニング方法 |
| US4972774A (en) * | 1985-04-29 | 1990-11-27 | Baldwin Technology Corporation | Automatically controlling water feedrate on a lithographic press |
| DE3706602A1 (de) * | 1987-02-28 | 1988-09-08 | Roland Man Druckmasch | Farbwerk fuer eine rotations-offsetdruckmaschine |
| US4809606A (en) * | 1987-06-19 | 1989-03-07 | Airsystems Inc. | Oscillating form roller and apparatus and method for controlling the oscillation thereof |
| DE3912811A1 (de) * | 1989-04-19 | 1990-10-25 | Heidelberger Druckmasch Ag | Verfahren und vorrichtung fuer die feuchtmittelfuehrung einer offset-druckmaschine |
| DE4214139C2 (de) * | 1992-04-29 | 2002-01-10 | Heidelberger Druckmasch Ag | Verfahren zur Feuchtmittelregulierung beim Drucken von einem Formzylinder in einer Offsetdruckmaschine |
| US5587728A (en) * | 1994-04-29 | 1996-12-24 | International Business Machines Corporation | Optical feedback printer |
| DE19546260C1 (de) * | 1995-12-12 | 1996-11-21 | Weitmann & Konrad Fa | Verfahren zur Überwachung der Sprühmenge einer zur Befeuchtung bewegter Materialbahnen in die Breite versprühten Flüssigkeit über deren Breite, Vorrichtung zur Durchführung des Verfahrens, sowie Verwendung der Vorrichtung |
| DE10032281A1 (de) * | 2000-07-03 | 2002-01-17 | Heidelberger Druckmasch Ag | Verfahren zur Beeinflussung einer Emulsion in einer Druckmaschine |
| DE10058550A1 (de) * | 2000-11-24 | 2002-05-29 | Heidelberger Druckmasch Ag | Verfahren zur Regelung des Farb-zu-Feuchtmittelgleichgewichts in einer Rotations-Offsetdruckmaschine |
| JP4638685B2 (ja) * | 2003-06-10 | 2011-02-23 | ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト | オフセット印刷機による印刷の際に湿し水を調量する方法 |
| US10022951B2 (en) * | 2014-04-28 | 2018-07-17 | Xerox Corporation | Systems and methods for implementing a vapor condensation technique for delivering a uniform layer of dampening solution in an image forming device using a variable data digital lithographic printing process |
| KR102115956B1 (ko) * | 2018-01-03 | 2020-05-28 | 양한석 | 알콜이 함유되지 않고도 고품질의 인쇄물을 얻을 수 있는 오프셋인쇄기 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3134326A (en) * | 1959-07-15 | 1964-05-26 | William F Davis | Machinery for apportioning and dispensing fluids |
| GB1438634A (en) * | 1972-09-12 | 1976-06-09 | Vickers Ltd | Printing |
| US3822643A (en) * | 1973-01-26 | 1974-07-09 | Pitney Bowes Inc | Dampening control circuit for off-set printing apparatus |
| US4151796A (en) * | 1973-04-02 | 1979-05-01 | Heidelberger Druckmaschinen Aktiengesellschaft | Device for automatically controlling deviations in liquid feed in offset presses |
| DE2736663C3 (de) * | 1977-08-13 | 1985-05-15 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Vorrichtung zur Ermittlung des Feucht- und Farbgleichgewichts bei Offsetdruckwerken |
| DE2931579C2 (de) * | 1979-08-03 | 1982-11-11 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Einrichtung zur zonalen Regulierung der Feuchtmittelführung |
| DE2944322A1 (de) * | 1979-11-02 | 1981-05-07 | Luciano 2000 Hamburg Tezzele | Verfahren zur messung der farbdichte von in druckmaschinen bedruckten grafischen erzeugnissen und vorrichtung zur durchfuehrung des verfahrens |
-
1983
- 1983-04-26 AT AT0151683A patent/AT389675B/de not_active IP Right Cessation
- 1983-05-17 EP EP83104846A patent/EP0095652B1/fr not_active Expired
- 1983-05-24 CA CA000428727A patent/CA1209856A/fr not_active Expired
- 1983-05-27 JP JP58092583A patent/JPS58219053A/ja active Granted
- 1983-05-30 ES ES522818A patent/ES522818A0/es active Granted
- 1983-06-02 US US06/500,316 patent/US4485737A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332698A (zh) * | 2007-06-28 | 2008-12-31 | 海德堡印刷机械股份公司 | 用于在印刷时确定感脂极限的测量区 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0095652B1 (fr) | 1986-09-03 |
| EP0095652A3 (en) | 1984-07-25 |
| US4485737A (en) | 1984-12-04 |
| ATA151683A (de) | 1989-06-15 |
| JPH0358909B2 (fr) | 1991-09-06 |
| CA1209856A (fr) | 1986-08-19 |
| ES8403066A1 (es) | 1984-03-16 |
| AT389675B (de) | 1990-01-10 |
| JPS58219053A (ja) | 1983-12-20 |
| ES522818A0 (es) | 1984-03-16 |
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