CA2039354C - Preparation of the inking unit of a printing press for a change of printing job - Google Patents
Preparation of the inking unit of a printing press for a change of printing jobInfo
- Publication number
- CA2039354C CA2039354C CA002039354A CA2039354A CA2039354C CA 2039354 C CA2039354 C CA 2039354C CA 002039354 A CA002039354 A CA 002039354A CA 2039354 A CA2039354 A CA 2039354A CA 2039354 C CA2039354 C CA 2039354C
- Authority
- CA
- Canada
- Prior art keywords
- printing
- ink
- inking
- roller
- printing forme
- 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 - Fee Related
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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
- B41F35/06—Cleaning arrangements or devices for offset cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Abstract
The invention relates to a rotary printing press, particularly offset printing press, the printing unit of which comprises a printing forme, a damping unit as well as an inking unit, said inking unit being provided with a set ink profile. In order to obtain a fast change of ink profile, it is proposed that, in order to eliminate the previous ink profile and to prepare the buildup of a new ink profile, the printing forme (32) is inked over its entire surface area with the inking unit (1).
Description
PREPARATION OF -fhlE INKING UNI f OF A ~°~r'~~r'~~ ~~
PRINTING PRESS FUR A CHANGE OF PRIN-faNG UUEi Specification The invention relates to a rotary printing press, particularly offset printing press, the printing unit of which comprises a printing forme, a damping unit as well as an inking unit, said inking unit being provided with a set ink profile.
In printing presses of the initially mentioned kind, it is necessary, for the running-on state, to build up in the inking unit an ink profile appropriate to the subject to be printed. If the ink profile suitable for running on does not yet exist at the start of printing, then, after proofing, a large amount of waste is first of all produced before the necessary ink profile and thus also a stable ink/damping-solution equilibrium are obtained. In order to prevent or in order considerably to reduce waste, therefore, it is necessary to provide the appropriate ink profile already at the start of printing. This applies in particular if a new printing forme is being used with a subject that differs from the previous printing job. Furthermore, in order to prevent waste also after lengthy interruptions in printing (i.e.
when an already used printing forme is used again), the necessary ink profile should-have been set in the inking unit when proofing takes place.
Known from DE-OS 38 00 570 is a printing unit for rotary printing presses that comprises at least two ink-conducting cylinders, such as plate cylinder and rubber-blanket cylinder. In order to set a state suitable for running on, an engageable/disengageable ink-reducing unit is assigned to at least one of the ink-conducting cylinders. Said ink-reducing unit assumes the function - of the stock, i.e. the film of ink and damping solution ~~)~;~~~~~.
supplied from the inking unit and from the damping unit is transferred in a manner appropriate to the subject onto the ink-conducting cylinder, from where it is accepted by the ink-reducing unit. This makes it possible to set the ink profile necessary for running on without it being necessary to print the stock. GJaste can thus largely be prevented.
Furthermore, it is known, when changing printing jobs, i.e. when using a new printing plate involving a change of subject as compared with the previous printing forme, first of all to clean the inking unit, with the result that the ink profi7.e existing in the inking unit for the previous printing job is eliminated by removal of the ink. The removal of the entire volume of ink from the inking unit, which is accomplished in particular by scraping-pff and subsequent washing, is very elaborate and thus time-consuming. Furthermore, it is necessary, for a new start of printing, to build up an entirely new ink profile within the inking unit, i.e. it is necessary first of all to re-introduce a corresponding valume of ink.
The object of the invention, therefore, is to indicate a rotary printing press of the initially mentioned kind in which it is possible in simple manner and at short notice to change the ink profile, with the result that there is a shortening of the set-up times when there is a change of printing job. Furthermore, the state suitable for running on is to be achieved as quickly as possible when proofing, so that waste is largely prevented.
The object of the invention is achieved in that, in order to eliminate the previous ink profile and to prepare the buildup of a new ink profile, the printing ~~;,~~~3 ~~
forma is inked aver its entire surface area with the inking unit. As a result, the previously existing ink profile is destroyed ar equalized. The inking of the printing forma aver its entire surface area means that there is a corresponding ink distribution as far as into the inking unit, i.e. there too, there is an equalized ink distribution over the longitudinal extent of the inking-unit rollers. This creates a good basis for building up the new ink profile, necessary for the next printing job, on the thus formed "base ink-film thickness". This dispenses with the need to remove the entire volume of ink from the inking unit, with the result that there is a considerab7.e shortening of the set-up times when there is a change of printing job.
Moreover, the new ink profile can be built up considerably faster on the equalized base ink film than in the case of an inking unit that has been washed and that is ink-free. With the inking of the printing forma over its entire surface area according to the invention, the ink-profile presetting of the metering elements in the region of the ink duct of the inking unit can either maintain the old presetting or the printer can already make the new presetting there. Preferably, however, it is also alternatively possible for there to be a neutral setting there. If the ink-profile presetting appropriate to the new printing job is already performed .
when the printing plate is inked, this makes it possible all the sooner to achieve the subject-dependent ink profile suitable for running on, with the result that v~aste is largely prevented.
Preferably, in order to ink the printing forma over its entire surface area, the damping unit is controlled in such a manner that no damping solution or only a reduced quantity of damping solution is supplied to the printing w forma. The absence of damping solution or the presence of an insufficient amount thereof means that, also during running on, ink-free regions of the printing forma accept ink, as a result of which there is the full-surface-area inking according to the invention.
The supply of damping solution can be suppressed in that the damping-solution applicator roller or damping-solution applicator rollers of the damping unit assume a disengaged position with respect to the printing forma during the inking of the latter. If damping unit and inking unit are connectable to one another through the intermediary of an intermediate roller, said intermediate roller must be brought into a disengaged position with respect to the damping unit and/or inking unit, so that, also, no damping solution is able to pass via the intermediate roller to the inking unit and from there to the printing forma.
In order for the printing forma, inked over its entire surface area, to be freed again from the ink, a rubber-blanket washing apparatus, assigned to a rubber-blanket cylinder, is provided, said rubber-blanket washing, apparatus washing the printing forma in that the rubber-blanket cylinder assumes an engaged position with respect to the printing forma. Thus, not only does the rubber-blanket washing apparatus wash the rubber blanket, but, as a result of the engaged position of the rubber-blanket cylinder with respect to the printing forma, i.e. with respect to the printing plate clamped onta a plate cylinder, the washing liquid is supplied also to the printing plate. Should the design of the printing press not allow an exclusive engaged position between rubber-blanket cylinder and plate cylinder, but should it have to be expected that a backpressure cylinder conducting the stock (paper, for example) will come at least as close to the rubber-blanket cylinder ~~~i~~ i~
that, there too, 'the 'transfer of washing liquid is to tae feared, then the paper-thickness compensator, provided in actual fact for paper-thickness compensation, can preferably be adjusted in such a manner that there is a sufficient distance between backpressure cylinder and rubber-blanket cylinder in order to prevent the transfer of washing liquid.
In order to ensure that the equalized ink profile built up in the inking unit is not destroyed by the washing liquid, a separation must be made during washing between the printing forma and the inking unit. The inking unit comprises preferably at least one inking roller, sand inking roller cooperating with the printing forma. Said inking roller must, therefore, during washing, be moved into a disengaged position with respect to the printing f orme .
The invention relates further to a process for the building up of a new ink profile in an inking unit of a rotary printing press comprising a printing forma, particularly an offset printing press, preferably for the carrying-out of a new printing job, in which, in order to destroy/equalize the previous ink profile, the printing forma is inked over its entire surface area with the inking unit. After the previous ink profile has been destroyed or equalized, the printing forma can be washed. This washing operation can take place in the printing press, with, in this case, however, it being necessary for the inking unit to assume a disengaged position pith respect to the printing forma, so that no washing liquid is transferred. It is provided, in particular, that the washing operation is performed with a rubber-blanket washing apparatus. For this purpose, the rubber blanket assumes an engaged position with respect to the printing forma, which is preferably in the form of a printing plate (aluminiurn plate) clamped onto a plate cylinder.
The invention is illustrated with reference to a specimen embodiment in the drawings, in which:
Fig. 1 shows a diagram of rollers of an inking unit and damping unit in an offset printing press;
and Fig. 2 shows the diagram of rollers from Fig. 1, with a rubber-blanket washing apparatus disposed on a rubber-blanket cylinder.
Fig. 1 shows a diagram of rollers in an offset printing press (printing press not represented in any greater detail). An inking unit 1 and a damping unit 2 are provided. The inking unit 1 is provided with an ink duct 3, which has metering elements (not shown) for setting zonal inking gaps. An ink-duct roller 4 withdraws ink in metered manner from the ink duct 3 during operation. A vibrator 5 cooperates with the ink-duct roller 4 as well as with a driven distributor,6.
xhe damping unit 2 comprises a damping-solution box 26 filled with damping solution 27, with a fountain roller 28 being partially immersed in the damping solution 27.
The fountain roller 28 cooperates with a metering roller 29. Further provided is a rubber-covered roller 30.
Inking unit l and damping unit 2 additionally comprise further driven distributors 7, 8, 9 and l0. In addition, there are six rider and transfer rollers 11 to l6 and nine rubber-covered rollers 17 to 25. If necessary, inking unit 1 and damping unit 2 can be connected to one another through the intermediary of an intermediate roller (not shown).
Both ink and damping solution 27 axe supplied to a printing forma 32 via the described roller arrangement.
The printing forma 32 is a printing plate (not shown), said printing plate being clamped onto a plate cylinder 33. The transfer of ink and damping solution 27 from the inking unit 1 and damping unit 2, respectively, to the printing plate is effected by the rubber-covered rollers 18, 20, 25 and 30. Consequently, said rubber-covered rollers are referred to also as inking rollers 34 and the rubber-covered roller 30 transferring the damping solution is referred to as damping-solution applicator roller 35.
By means of a control apparatus (not shown) it is possible for the inking rollers 34 and the damping-solution application roller 35 to be moved into an engaged or disengaged position with respect to the printing forma 32. In the representation shown in Fig. 1, the inking rollers 34 are in their engaged positions and the damping-solution applicator roller 35 in its disengaged position.
Let it be assumed that a printing job - carried out with the printing plate, clamped onto the plate cylinder 33 -has been finished, i.e. a desired number of copies have been printed. There is now to be a change of printing job; a new printing run is to be performed with a printing plate carrying a different subject.
So that an ink profile appropriate to the running-on state of the new printing process can be set as quickly as possible in the inking unit, the printing forma 32, i.e. the previously used printing plate clamped on the plate cylinder 33, is, according to the invention, first of all inked over its entire surface area. This is - achieved preferably in that, as a result of the s ~~a.~~.'~
disengaged position of the damping-solution applicator roller 35 with respect to the plate cylinder 33 and in the absence of a connection between damping unit 2 and inking unit 1 (if an intermediate roller is used, it would have to be moved to a separation position), no damping solution 27 reaches the printing forma 32.
Thus, regions of the printing forma 32 that are in actual fact ink-free in the running-on state accept ink (scumming). The inking of the printing forma 32 over its entire surface area has repercussions on the ink profile in the inking unit 1, where the previous ink profile, originating from the printing job performed, is destroyed, being, in particular, equalized. This leads to a "base ink-film thickness", which forms the basis for the building-up of a new ink profile for the next printing job.
Before the new printing plate is clamped onto the plate cylinder 33, the old printing plate, inked over its entire surface area, is first of all to be cleaned. For this purpose; as shown in Fig. 2, the inking rollers 34 are moved into disengaged positions with respect to the printing forma 32. The damping-solution applicator roller 35 remains in its disengaged position with respect to the plate cylinder 33. A rubber-blanket cylinder 36, which always exists in an offset printing press, is brought into an engaged position with respect to the plate cylinder 33. A rubber-blanket washing apparatus 37 is assigned to the rubber-blanket cylinder 36. Said washing apparatus comprises two washing rollers 38, running on the outer cylindrical surface of the rubber-blanket cylinder 36, as well as a common ro112r 39, connecting the washing rollers 38. Further provided is a transfer roller 40, which is in contact with the upper washing. roller 38 and to which washing liquid can be supplied by means of a spray apparatus ~.~,a~a~~a~,~~~~
41. Assigned to the roller 39 is a doctor-blade apparatus 42, under which is disposed a collection trough. 43 .
In the washing position (Fig. 2), the washing liquid supplied from the spray apparatus is transferred to the rubber blanket of the rubber-blanket cylinder 36 by means of the transfer roller 40 and the washing rollers 38. The rubber-blanket cylinder 36, in turn, transfers a certain proportion of the washing liquid to the plate cylinder 33, i.e. onto the printing forma 32, with the result that the coating of ink forming the full-surface-area inking is loosened and carried away. Residues of ink and similar are passed in this manner as far as the roller 39, where they are skimmed off by the doctor-blade apparatus 42.
When the previously used printing plate has been cleaned, it is removed from the offset printing press.
The printing plate to be used for the new printing job can then be clamped onto the plate cylinder 33.
In order to equalize the previous ink profile in the inking unit as well as in order to build up the new ink profile required for the new printing job, it is possible, at the metering elements of the ink duct 3, already to set the tonal inking gaps to the new setting while the printing forma 32 is being inked over its entire surface area, said new setting being appropriate to the subject of the new printing plate to be used for the next printing job.
Further, as a variation on the previous versions) it is also possible for the old printing plate first of all to be removed and then for the new printing plate to be clamped onto the plate cylinder 33. The new printing plate is then inked over its entire surface area with suitable setting of the ink profile, Subsequently, as shown, the printing plate is then washed. Finally, the actual printing process can be commenced. It is, however, also possible for the ne~a printing plate, inked over its entire surface area, to "run clean"
through the supply of damping solution, i.e. the full-surface-area inking is removed by the supply of damping solution to the ink-free regions. It is not then necessary for there to be any washing operation (as mentioned above). As an alternative to the cleaning of the printing forma by means of the rubber-blanket washing apparatus, it is also possible to use a plate-cylinder washing apparatus.
PRINTING PRESS FUR A CHANGE OF PRIN-faNG UUEi Specification The invention relates to a rotary printing press, particularly offset printing press, the printing unit of which comprises a printing forme, a damping unit as well as an inking unit, said inking unit being provided with a set ink profile.
In printing presses of the initially mentioned kind, it is necessary, for the running-on state, to build up in the inking unit an ink profile appropriate to the subject to be printed. If the ink profile suitable for running on does not yet exist at the start of printing, then, after proofing, a large amount of waste is first of all produced before the necessary ink profile and thus also a stable ink/damping-solution equilibrium are obtained. In order to prevent or in order considerably to reduce waste, therefore, it is necessary to provide the appropriate ink profile already at the start of printing. This applies in particular if a new printing forme is being used with a subject that differs from the previous printing job. Furthermore, in order to prevent waste also after lengthy interruptions in printing (i.e.
when an already used printing forme is used again), the necessary ink profile should-have been set in the inking unit when proofing takes place.
Known from DE-OS 38 00 570 is a printing unit for rotary printing presses that comprises at least two ink-conducting cylinders, such as plate cylinder and rubber-blanket cylinder. In order to set a state suitable for running on, an engageable/disengageable ink-reducing unit is assigned to at least one of the ink-conducting cylinders. Said ink-reducing unit assumes the function - of the stock, i.e. the film of ink and damping solution ~~)~;~~~~~.
supplied from the inking unit and from the damping unit is transferred in a manner appropriate to the subject onto the ink-conducting cylinder, from where it is accepted by the ink-reducing unit. This makes it possible to set the ink profile necessary for running on without it being necessary to print the stock. GJaste can thus largely be prevented.
Furthermore, it is known, when changing printing jobs, i.e. when using a new printing plate involving a change of subject as compared with the previous printing forme, first of all to clean the inking unit, with the result that the ink profi7.e existing in the inking unit for the previous printing job is eliminated by removal of the ink. The removal of the entire volume of ink from the inking unit, which is accomplished in particular by scraping-pff and subsequent washing, is very elaborate and thus time-consuming. Furthermore, it is necessary, for a new start of printing, to build up an entirely new ink profile within the inking unit, i.e. it is necessary first of all to re-introduce a corresponding valume of ink.
The object of the invention, therefore, is to indicate a rotary printing press of the initially mentioned kind in which it is possible in simple manner and at short notice to change the ink profile, with the result that there is a shortening of the set-up times when there is a change of printing job. Furthermore, the state suitable for running on is to be achieved as quickly as possible when proofing, so that waste is largely prevented.
The object of the invention is achieved in that, in order to eliminate the previous ink profile and to prepare the buildup of a new ink profile, the printing ~~;,~~~3 ~~
forma is inked aver its entire surface area with the inking unit. As a result, the previously existing ink profile is destroyed ar equalized. The inking of the printing forma aver its entire surface area means that there is a corresponding ink distribution as far as into the inking unit, i.e. there too, there is an equalized ink distribution over the longitudinal extent of the inking-unit rollers. This creates a good basis for building up the new ink profile, necessary for the next printing job, on the thus formed "base ink-film thickness". This dispenses with the need to remove the entire volume of ink from the inking unit, with the result that there is a considerab7.e shortening of the set-up times when there is a change of printing job.
Moreover, the new ink profile can be built up considerably faster on the equalized base ink film than in the case of an inking unit that has been washed and that is ink-free. With the inking of the printing forma over its entire surface area according to the invention, the ink-profile presetting of the metering elements in the region of the ink duct of the inking unit can either maintain the old presetting or the printer can already make the new presetting there. Preferably, however, it is also alternatively possible for there to be a neutral setting there. If the ink-profile presetting appropriate to the new printing job is already performed .
when the printing plate is inked, this makes it possible all the sooner to achieve the subject-dependent ink profile suitable for running on, with the result that v~aste is largely prevented.
Preferably, in order to ink the printing forma over its entire surface area, the damping unit is controlled in such a manner that no damping solution or only a reduced quantity of damping solution is supplied to the printing w forma. The absence of damping solution or the presence of an insufficient amount thereof means that, also during running on, ink-free regions of the printing forma accept ink, as a result of which there is the full-surface-area inking according to the invention.
The supply of damping solution can be suppressed in that the damping-solution applicator roller or damping-solution applicator rollers of the damping unit assume a disengaged position with respect to the printing forma during the inking of the latter. If damping unit and inking unit are connectable to one another through the intermediary of an intermediate roller, said intermediate roller must be brought into a disengaged position with respect to the damping unit and/or inking unit, so that, also, no damping solution is able to pass via the intermediate roller to the inking unit and from there to the printing forma.
In order for the printing forma, inked over its entire surface area, to be freed again from the ink, a rubber-blanket washing apparatus, assigned to a rubber-blanket cylinder, is provided, said rubber-blanket washing, apparatus washing the printing forma in that the rubber-blanket cylinder assumes an engaged position with respect to the printing forma. Thus, not only does the rubber-blanket washing apparatus wash the rubber blanket, but, as a result of the engaged position of the rubber-blanket cylinder with respect to the printing forma, i.e. with respect to the printing plate clamped onta a plate cylinder, the washing liquid is supplied also to the printing plate. Should the design of the printing press not allow an exclusive engaged position between rubber-blanket cylinder and plate cylinder, but should it have to be expected that a backpressure cylinder conducting the stock (paper, for example) will come at least as close to the rubber-blanket cylinder ~~~i~~ i~
that, there too, 'the 'transfer of washing liquid is to tae feared, then the paper-thickness compensator, provided in actual fact for paper-thickness compensation, can preferably be adjusted in such a manner that there is a sufficient distance between backpressure cylinder and rubber-blanket cylinder in order to prevent the transfer of washing liquid.
In order to ensure that the equalized ink profile built up in the inking unit is not destroyed by the washing liquid, a separation must be made during washing between the printing forma and the inking unit. The inking unit comprises preferably at least one inking roller, sand inking roller cooperating with the printing forma. Said inking roller must, therefore, during washing, be moved into a disengaged position with respect to the printing f orme .
The invention relates further to a process for the building up of a new ink profile in an inking unit of a rotary printing press comprising a printing forma, particularly an offset printing press, preferably for the carrying-out of a new printing job, in which, in order to destroy/equalize the previous ink profile, the printing forma is inked over its entire surface area with the inking unit. After the previous ink profile has been destroyed or equalized, the printing forma can be washed. This washing operation can take place in the printing press, with, in this case, however, it being necessary for the inking unit to assume a disengaged position pith respect to the printing forma, so that no washing liquid is transferred. It is provided, in particular, that the washing operation is performed with a rubber-blanket washing apparatus. For this purpose, the rubber blanket assumes an engaged position with respect to the printing forma, which is preferably in the form of a printing plate (aluminiurn plate) clamped onto a plate cylinder.
The invention is illustrated with reference to a specimen embodiment in the drawings, in which:
Fig. 1 shows a diagram of rollers of an inking unit and damping unit in an offset printing press;
and Fig. 2 shows the diagram of rollers from Fig. 1, with a rubber-blanket washing apparatus disposed on a rubber-blanket cylinder.
Fig. 1 shows a diagram of rollers in an offset printing press (printing press not represented in any greater detail). An inking unit 1 and a damping unit 2 are provided. The inking unit 1 is provided with an ink duct 3, which has metering elements (not shown) for setting zonal inking gaps. An ink-duct roller 4 withdraws ink in metered manner from the ink duct 3 during operation. A vibrator 5 cooperates with the ink-duct roller 4 as well as with a driven distributor,6.
xhe damping unit 2 comprises a damping-solution box 26 filled with damping solution 27, with a fountain roller 28 being partially immersed in the damping solution 27.
The fountain roller 28 cooperates with a metering roller 29. Further provided is a rubber-covered roller 30.
Inking unit l and damping unit 2 additionally comprise further driven distributors 7, 8, 9 and l0. In addition, there are six rider and transfer rollers 11 to l6 and nine rubber-covered rollers 17 to 25. If necessary, inking unit 1 and damping unit 2 can be connected to one another through the intermediary of an intermediate roller (not shown).
Both ink and damping solution 27 axe supplied to a printing forma 32 via the described roller arrangement.
The printing forma 32 is a printing plate (not shown), said printing plate being clamped onto a plate cylinder 33. The transfer of ink and damping solution 27 from the inking unit 1 and damping unit 2, respectively, to the printing plate is effected by the rubber-covered rollers 18, 20, 25 and 30. Consequently, said rubber-covered rollers are referred to also as inking rollers 34 and the rubber-covered roller 30 transferring the damping solution is referred to as damping-solution applicator roller 35.
By means of a control apparatus (not shown) it is possible for the inking rollers 34 and the damping-solution application roller 35 to be moved into an engaged or disengaged position with respect to the printing forma 32. In the representation shown in Fig. 1, the inking rollers 34 are in their engaged positions and the damping-solution applicator roller 35 in its disengaged position.
Let it be assumed that a printing job - carried out with the printing plate, clamped onto the plate cylinder 33 -has been finished, i.e. a desired number of copies have been printed. There is now to be a change of printing job; a new printing run is to be performed with a printing plate carrying a different subject.
So that an ink profile appropriate to the running-on state of the new printing process can be set as quickly as possible in the inking unit, the printing forma 32, i.e. the previously used printing plate clamped on the plate cylinder 33, is, according to the invention, first of all inked over its entire surface area. This is - achieved preferably in that, as a result of the s ~~a.~~.'~
disengaged position of the damping-solution applicator roller 35 with respect to the plate cylinder 33 and in the absence of a connection between damping unit 2 and inking unit 1 (if an intermediate roller is used, it would have to be moved to a separation position), no damping solution 27 reaches the printing forma 32.
Thus, regions of the printing forma 32 that are in actual fact ink-free in the running-on state accept ink (scumming). The inking of the printing forma 32 over its entire surface area has repercussions on the ink profile in the inking unit 1, where the previous ink profile, originating from the printing job performed, is destroyed, being, in particular, equalized. This leads to a "base ink-film thickness", which forms the basis for the building-up of a new ink profile for the next printing job.
Before the new printing plate is clamped onto the plate cylinder 33, the old printing plate, inked over its entire surface area, is first of all to be cleaned. For this purpose; as shown in Fig. 2, the inking rollers 34 are moved into disengaged positions with respect to the printing forma 32. The damping-solution applicator roller 35 remains in its disengaged position with respect to the plate cylinder 33. A rubber-blanket cylinder 36, which always exists in an offset printing press, is brought into an engaged position with respect to the plate cylinder 33. A rubber-blanket washing apparatus 37 is assigned to the rubber-blanket cylinder 36. Said washing apparatus comprises two washing rollers 38, running on the outer cylindrical surface of the rubber-blanket cylinder 36, as well as a common ro112r 39, connecting the washing rollers 38. Further provided is a transfer roller 40, which is in contact with the upper washing. roller 38 and to which washing liquid can be supplied by means of a spray apparatus ~.~,a~a~~a~,~~~~
41. Assigned to the roller 39 is a doctor-blade apparatus 42, under which is disposed a collection trough. 43 .
In the washing position (Fig. 2), the washing liquid supplied from the spray apparatus is transferred to the rubber blanket of the rubber-blanket cylinder 36 by means of the transfer roller 40 and the washing rollers 38. The rubber-blanket cylinder 36, in turn, transfers a certain proportion of the washing liquid to the plate cylinder 33, i.e. onto the printing forma 32, with the result that the coating of ink forming the full-surface-area inking is loosened and carried away. Residues of ink and similar are passed in this manner as far as the roller 39, where they are skimmed off by the doctor-blade apparatus 42.
When the previously used printing plate has been cleaned, it is removed from the offset printing press.
The printing plate to be used for the new printing job can then be clamped onto the plate cylinder 33.
In order to equalize the previous ink profile in the inking unit as well as in order to build up the new ink profile required for the new printing job, it is possible, at the metering elements of the ink duct 3, already to set the tonal inking gaps to the new setting while the printing forma 32 is being inked over its entire surface area, said new setting being appropriate to the subject of the new printing plate to be used for the next printing job.
Further, as a variation on the previous versions) it is also possible for the old printing plate first of all to be removed and then for the new printing plate to be clamped onto the plate cylinder 33. The new printing plate is then inked over its entire surface area with suitable setting of the ink profile, Subsequently, as shown, the printing plate is then washed. Finally, the actual printing process can be commenced. It is, however, also possible for the ne~a printing plate, inked over its entire surface area, to "run clean"
through the supply of damping solution, i.e. the full-surface-area inking is removed by the supply of damping solution to the ink-free regions. It is not then necessary for there to be any washing operation (as mentioned above). As an alternative to the cleaning of the printing forma by means of the rubber-blanket washing apparatus, it is also possible to use a plate-cylinder washing apparatus.
Claims (11)
1. In a process for the building-up of a new ink profile in an inking unit (1) of a rotary printing press, wherein said rotary printing press comprises a printing forme (32) and the inking unit (1) comprises at least one inking roller (34) which cooperates with the printing forme (32), the inking unit (1) being provided with a previous ink profile, said process including the first step of the printing forme (32) being inked over its entire surface area with the at least one inking roller (34), in order to equalize said previous ink profile.
2. In a process according to Claim 1, wherein the rotary printing press comprises a damping unit (2), and wherein said first process step includes controlling the damping unit (2) such that the quantity of damping solution normally supplied to the printing forme (32) is greatly reduced.
3. In a process according to Claim 2, wherein the damping unit (2) comprises at least one damping-solution applicator roller (35), and wherein said first process step includes moving the damping-solution applicator roller (35) to a disengaged position with respect to the printing forme (32) during inking to equalize the previous ink profile, in order for the inking to be performed without the supply of damping solution from the damping unit (2).
4. In a process according to Claim 1, 2 or 3, wherein said process includes a second step of washing the printing forme (32) after the previous ink profile has been equalized.
5. In a process according to Claim 4, wherein said second process step includes the movement of at least one inking roller (34) to a disengaged position with respect to the printing forme (32) during washing of the latter.
6. In a process according to Claim 4 or 5, wherein said rotary printing press comprises a rubber-blanket washing apparatus (37) and a rubber-blanket cylinder (36) to which the rubber-blanket washing apparatus (37) is assigned, said second process step including the washing of the printing forme (32) being performed by the rubber-blanket washing apparatus (37) by movement of the rubber-blanket cylinder (36) to an engaged position with respect to the printing forme (32).
7. In a process according to Claim 1, 2, 3, 4, 5 or 6, wherein said rotary printing press comprises a plate cylinder (33) which is provided with a previous printing forme, said process, before said first step, including the step of removing the previous printing plate and clamping a new printing forme onto the plate cylinder (33) which then is the printing forme (32).
8. In a process according to Claim 7, wherein the printing forme representing the new printing forme (32) comprises a subject, said process, after said first step, including the step of the printing forme (32) being treated by the supply of damping solution in such a manner, that regions of said subject that are ink-free in the running-on state become ink-free, so that the printing forme (32) can be used for a new printing job.
9. A process for simplifying the removal of an existing ink profile on a roller of an inking unit of a rotary printing press as part of the preparation for receiving a new ink profile, said process comprising inking the entire surface of said roller to destroy said existing ink profile by equalizing the ink profile on said roller.
10. A process as claimed in Claim 9 including washing said roller after said existing ink profile has been equalized.
11. A process as claimed in Claim 10 including establishing a new ink profile on said ink roller after said ink roller has been washed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4013463A DE4013463A1 (en) | 1990-04-27 | 1990-04-27 | PREPARATION OF THE INK OF A PRINTING MACHINE WHEN CHANGING PRINT ORDERS |
| DE4013463.6 | 1990-04-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2039354A1 CA2039354A1 (en) | 1991-10-28 |
| CA2039354C true CA2039354C (en) | 1999-10-26 |
Family
ID=6405218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002039354A Expired - Fee Related CA2039354C (en) | 1990-04-27 | 1991-03-28 | Preparation of the inking unit of a printing press for a change of printing job |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0453855B1 (en) |
| JP (1) | JPH07112524A (en) |
| AT (1) | ATE115047T1 (en) |
| AU (1) | AU643002B2 (en) |
| CA (1) | CA2039354C (en) |
| DE (2) | DE4013463A1 (en) |
| ES (1) | ES2067076T3 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994025277A1 (en) * | 1993-05-05 | 1994-11-10 | Machinefabriek 'csw' B.V. | Apparatus for transferring a printing fluid to a printing roller |
| DE4436953C1 (en) * | 1994-10-15 | 1996-05-15 | Roland Man Druckmasch | Method for generating an ink layer thickness distribution on inking rollers of an inking unit of a printing press |
| DE19631469C1 (en) * | 1996-08-03 | 1998-02-19 | Roland Man Druckmasch | Method and device for performing print jobs |
| DE10057051B4 (en) | 1999-12-06 | 2011-03-10 | Heidelberger Druckmaschinen Ag | Method for starting a printing press |
| DE102008009889A1 (en) * | 2008-02-19 | 2009-08-20 | Manroland Ag | Process for coloring a printing form in a processing machine |
| DE102008000725A1 (en) | 2008-03-18 | 2009-09-24 | Manroland Ag | Inking unit and dampening unit |
| DE102008000726A1 (en) | 2008-03-18 | 2009-09-24 | Manroland Ag | Roller for a printing unit |
| DE102010017866A1 (en) | 2009-05-07 | 2010-11-25 | Heidelberger Druckmaschinen Ag | Method for controlling an inking unit of a printing machine |
| DE102010040383B4 (en) * | 2010-09-08 | 2012-09-13 | Koenig & Bauer Aktiengesellschaft | Printing units and a method for operating a printing unit |
| JP6093152B2 (en) * | 2012-11-12 | 2017-03-08 | 株式会社小森コーポレーション | Ink supply method and ink supply apparatus |
| JP6531571B2 (en) * | 2015-09-02 | 2019-06-19 | 大日本印刷株式会社 | Ink film thickness control method, ink film thickness control device and ink film thickness control program |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2113608B2 (en) * | 1971-03-20 | 1973-10-31 | Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg | Method for operating an offset rotary printing machine |
| DD124643A1 (en) * | 1975-11-20 | 1977-03-09 | ||
| DE2819257C3 (en) * | 1978-05-02 | 1984-02-09 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Device for releasing or locking the pivoting movement of a lifting roller which can be actuated by a control cam |
| DE3034588C2 (en) * | 1980-09-13 | 1982-11-11 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Offset rotary printing machine with a device for interrupting the dampening solution supply |
| DE3338143C2 (en) * | 1983-10-20 | 1986-12-18 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Process for generating an ink layer thickness corresponding to the printed image in the inking unit of a printing machine |
| DE3707695A1 (en) * | 1987-03-11 | 1988-09-22 | Heidelberger Druckmasch Ag | METHOD FOR DEFINED PRODUCTION OF A COLOR DISTRIBUTION CLOSE TO CONTINUOUS PRINTING IN THE INKING UNIT OF ROTATIONAL PRINTING MACHINES |
| DE3800570A1 (en) * | 1988-01-12 | 1989-07-20 | Heidelberger Druckmasch Ag | PRINTING UNIT FOR ROTATIONAL PRINTING MACHINES |
-
1990
- 1990-04-27 DE DE4013463A patent/DE4013463A1/en active Granted
-
1991
- 1991-03-28 CA CA002039354A patent/CA2039354C/en not_active Expired - Fee Related
- 1991-04-08 AT AT91105542T patent/ATE115047T1/en not_active IP Right Cessation
- 1991-04-08 DE DE59103742T patent/DE59103742D1/en not_active Expired - Fee Related
- 1991-04-08 EP EP91105542A patent/EP0453855B1/en not_active Expired - Lifetime
- 1991-04-08 ES ES91105542T patent/ES2067076T3/en not_active Expired - Lifetime
- 1991-04-24 AU AU75349/91A patent/AU643002B2/en not_active Ceased
- 1991-04-30 JP JP3124650A patent/JPH07112524A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ATE115047T1 (en) | 1994-12-15 |
| AU643002B2 (en) | 1993-11-04 |
| ES2067076T3 (en) | 1995-03-16 |
| EP0453855A1 (en) | 1991-10-30 |
| DE59103742D1 (en) | 1995-01-19 |
| JPH07112524A (en) | 1995-05-02 |
| AU7534991A (en) | 1991-11-07 |
| EP0453855B1 (en) | 1994-12-07 |
| DE4013463C2 (en) | 1992-03-19 |
| CA2039354A1 (en) | 1991-10-28 |
| DE4013463A1 (en) | 1991-11-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |