Method for operating a printing unit of a printing press

Abstract

In the operation according to the invention of a printing unit of a printing press with a form cylinder and an inking unit that inks the form cylinder during operation, wherein the inking unit is designed as a lift inking unit, which comprises a color tray in which printing ink to be printed is stored during production operation and which has one or more adjusting elements for setting an ink delivery quantity to a color tray roller that interacts with the color tray for inking it, a first inking unit roller of a roller arrangement that extends from the first inking unit roller to one or more ink application rollers that ink the form cylinder during production operation, and a lift roller that moves back and forth between the color tray roller and the first inking unit roller during production operation, the removal of printing ink from the inking unit preferably takes place in aby interrupting the ink supply to the ink tray before a scheduled break or end of a production run, by establishing a closed roller contact between the ink tray roller and the first inking roller during or after the break or end of the production run, by switching off one or more inking rollers before, during, or after establishing the closed roller contact between the ink tray roller and the first inking roller, and by introducing washing fluid into the ink tray and / or onto a roller of the inking unit and activating a take-off device on one of the rollers of the inking unit during or after switching off the ink application rollers for washing.

Description

[0001] The invention relates to a method for operating a printing unit of a printing press according to the preamble of claim 1.

[0002] DE 44 24 581 C1 relates to a device for removing ink from a lifter inking unit of a rotary printing press, wherein a spray device for a cleaning fluid is assigned to the ink box and, optionally, to the inking roller assembly of the inking unit. The cleaning fluid, along with the ink, is removed from the roller assembly by a chambered doctor blade that can be positioned against an inking unit roller and discharged from the ink box via a drain opening. In one embodiment, the lifter roller can be brought into simultaneous contact with both the ink box roller and the first transfer roller by means of a gear mechanism, so that all rollers of the entire roller assembly are cleaned. In an embodiment with a lifter roller coupled at both ends, the spray device can be omitted, and cleaning can be carried out solely by means of cleaning fluid supplied in the ink box.

[0003] DE 44 24 590 C2 also discloses a device for cleaning a lifter inking unit, wherein, in a cleaning position, the lifter roller is in constant contact with the inkwell roller and the ink removal roller. For this purpose, the lifter roller is mounted in an eccentrically mounted lever. By pivoting the eccentric bearing via a working cylinder, the lifter roller can be moved into the cleaning position.

[0004] US Patent 4,643,092 A relates to a mechanism for the simple cleaning of a printing press, in which an additional roller is inserted between a ductor roller and a lifter roller of an inking unit to create a closed roller assembly. Prior to this, the printing ink is drained from the ink fountain. For cleaning, a solvent is introduced into the roller assembly, and the dissolved printing ink is scraped off by a roller located near the inking roller.

[0005] The invention is based on the objective of creating a method for operating a printing unit of a printing press.

[0006] The problem is solved according to the invention by the features of claim 1.

[0007] The advantages achievable with the invention consist in particular of the fact that it enables quick and effective washing of the dye works.

[0008] A particular advantage of the special design of the inking unit with bridge rollers is that no time-consuming adjustment work is required when production is restarted.

[0009] In a particularly advantageous operation of a printing unit of a printing press with a form cylinder and an inking unit that inks the form cylinder during operation, wherein the inking unit is designed as a lift inking unit, which comprises a color tray in which printing ink to be printed is stored during production operation and which has one or more adjusting elements for setting an ink delivery quantity to an ink intake roller that interacts with the color tray for inking it, a first inking unit roller of a roller arrangement that extends from the first inking unit roller to one or more ink application rollers that ink the form cylinder during production operation, and a lift roller that moves back and forth between the ink intake roller and the first inking unit roller during production operation, the removal of printing ink from the inking unit preferably takes place in aby interrupting the ink supply to the ink tray before a scheduled break or end of a production run, by creating a closed roller contact between the ink pickup roller and the first inking roller during or after the break or end of the production run, by switching off one or more ink application rollers before, during, or after the creation of the closed roller contact between the ink pickup roller and the first inking roller, and by introducing washing fluid into the ink tray and / or onto a roller of the inking unit and activating a take-off device on one of the rollers of the inking unit during or after the ink application rollers have been switched off.

[0010] In a further preferred embodiment, during the production run, before the color supply to the color template is interrupted, a metered supply of color is provided via a controllable and / or adjustable inlet.

[0011] A printing unit, particularly advantageous for the aforementioned operation, is designed with a form cylinder and an inking unit that inks the form cylinder during operation, wherein the inking unit is designed as a lift inking unit, comprising an ink tray in which printing ink to be printed is stored during a production operation and which has one or more adjusting elements for setting an ink delivery quantity to an ink intake roller that interacts with the ink tray for inking it, a first inking roller of a roller arrangement that extends from the first inking roller to one or more ink application rollers that ink the form cylinder during production operation, and a lift roller that moves back and forth between the ink intake roller and the first inking roller during production operation.Preferably, one or more additional rollers can be moved from a rest position to a working position between the lifting roller positioned against the ink-receiving roller and the first inking roller, or between the lifting roller positioned against the ink-receiving roller and the ink-receiving roller, such that a closed roller train is formed from the ink-receiving roller to the first inking roller by the lifting roller and the one or more additional rollers moved into working position.

[0012] Further beneficial training opportunities for the company and the printed material can be found in the description and requirements.

[0013] Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

[0014] They show: Fig. 1 a schematic representation of a sheet processing machine in a preferred embodiment; Fig. 2 a schematic representation of a superstructure module of a printing unit in a first embodiment; Fig. 3 a schematic representation of an alternative roller arrangement in a superstructure module of a printing unit in a second embodiment with a washing device shown; Fig. 4 a detailed representation of a section of a lift inking unit of a first version according to Fig. 2; Fig. 5 a detailed representation of a section of a lifter inking unit of an alternative design; Fig. 6 a schematic representation of a sequence in the operation of a printing press; Fig. 7 a spatial oblique view for the design of an acceptance device; Fig. 8 a detailed view of a holder carrying a squeegee Fig. 7 in detailed view.

[0015] A machine processing a sheet-shaped substrate B, e.g., a printing press, in particular a sheet-processing machine, comprises a substrate feeder 01, for example, designated as a sheet feeder 01, a feed unit 03, for example, designated as a sheet feeder 03, and a substrate delivery unit 08, for example, designated as a sheet delivery unit 08. Between the substrate feeder 01 and the substrate delivery unit 08, one or more processing stages 05, 06, 07, also designated as units 05, 06, 07, are arranged, which are designed, for example, as a printing unit 05, 06, coating unit 07, drying unit, calendering unit, or foil transfer unit, or in another suitable manner.In the case of the sheet-fed processing machine being configured as a printing press, in particular a sheet-fed printing press, at least one of the units 05; 06 is formed by a printing unit 05; 06, in particular an offset printing unit 05; 06, to which preferably one or more units 07, in particular coating units 07, are subordinate. In the case of several printing units 05; 06, the arrangement of one or more coating units 07 between the printing units 05; 06 may also be provided.

[0016] Unless explicitly stated otherwise, the term "sheet B" refers to any substrate B that is flat and exists in sections, including substrates B that are in sheet or plate form. The sheet B defined here is preferably made of paper or cardboard, but can also be made of sheets, plates, or other materials made of plastic, cardboard, glass, or metal.

[0017] The following section describes in more detail the individual components of a sheet-fed processing machine on a sheet-fed printing press.

[0018] For example, in Fig. Figure 1 shows a substrate feeder 01 designed as a sheet feeder 01, with a conveyor section 02 designed, for example, as a belt table 02, and with a substrate container 09 formed, for example, by a stack of sheets 09, which is arranged on a receiving device 10, e.g., a stacking plate 10. The stacking plate 10 is connected to transport means which ensure that the top of the sheet stack 09 is held in a defined position.

[0019] The figures show the structure of a printing unit substructure 31, a substructure 31 designed as a substructure module 31 of the units 05; 06, here printing units 05; 06. Of the printing units 05; 06, only the printing unit cylinders 34; 36, for example, the printing cylinders 34; 36, and the printing unit cylinders 33, for example, transfer cylinders 33, which transfer the printed image, are shown. These, together with the printing cylinders 34; 36, also referred to as impression cylinders 34; 36, form printing zones 55, also referred to as impression points 55 or printing gap 55. The transfer cylinders 33 are also referred to as rubber cylinders 33 or rubber blanket cylinders 33. The printing cylinders 34; 36 have a continuous cylinder shell surface, except for at least one axially extending cylinder channel 56. A gripper system 57 for taking over and transferring the sheet B in the gripper closure is preferably arranged in the cylinder channel 56.Double-sized printing cylinders 34; 36 therefore have two gripper systems 57 arranged in separate cylinder channels 56. Between the printing cylinders 34; 36, a transfer drum 35, designed as a transfer drum 35, is generally arranged with curved sheet support elements 58, e.g., so-called drum caps 58, arranged concentrically to the axis of rotation. Alternatively, the transfer drum 35 can also be designed without drum caps 58 as a so-called transferter 35. For taking the sheets B from the upstream printing cylinder 34 and transferring them to the downstream printing cylinder 36, the transfer drums 35 preferably have gripper systems 59. During sheet transport on the drum caps 58 of the transfer drum 35, the sheets B can be supported, in particular, by an air cushion guide arranged under the transfer drum 35 and thus laid smoothly onto the drum caps 58.The transfer drums 35 arranged between the printing cylinders 34, for example transfer drums 35 or transferters 35, can be single-sized or multi-sized, but are preferably double-sized. Single-sized cylinders can accommodate one sheet B and double-sized cylinders can accommodate two sheets B circumferentially.

[0020] Each printing unit 05; 06 comprises, for example, in the area of ​​a so-called printing unit superstructure 30 designed as a superstructure module 30, a printing unit cylinder 32 designed in particular as a form cylinder 32, e.g. as a plate cylinder 32, and in an embodiment for the offset printing process also a printing unit cylinder 33 designed in particular as a transfer cylinder 33, e.g. as a rubber cylinder 33. Furthermore, the printing unit 05; 06 comprises, for example, in the area of ​​a so-called printing unit substructure 31, a printing unit cylinder 34 designed as a printing cylinder 34 or impression cylinder 34 and a transfer drum 35 also referred to as a transfer drum 35.

[0021] The printing units 05; 06, as can be seen, for example, in the schematically depicted structure of the printing units 05; 06 in the figures, are preferably modular in design, such that the upper printing unit structure 30 is formed by a first module 30, e.g., a so-called upper unit module 30, and the lower printing unit structure 31 by a second module 31, e.g., a so-called lower unit module 31. In the modular design, the upper unit module 30 comprises, for example, the printing cylinder 32 and, in an embodiment for offset printing, also the transfer cylinder 33. The lower unit module 31 includes, in particular, the printing cylinder 34 and, for example, the transfer drum 35. In this context, "modular" or "module" can be understood as a unit which, with its main components or at least their connecting elements, is pre-assembled in a frame and can be inserted into the machine as a whole, if necessary.to be disassembled again, with the frame being designed as a frame that can be detached from the rest of the machine frame.

[0022] In the case of the modular design, the horizontal division between the upper module 30 and the lower module 31 preferably runs between the rubber cylinder 33 and the printing cylinder 34; 36. The vertical dividing line between the lower modules 31 or between the printing units 05; 06, viewed in the sheet transport direction, is predominantly placed between the transfer drum 35 of the printing unit 05 and the printing cylinder 36 of the subsequent printing unit 06.

[0023] The transmission cylinder 33 mentioned above, e.g. designed as a rubber cylinder 33, can have at least one fastening device with a fastening element 38 for holding and / or tensioning a rubber sheet. For example, a channel 37, designated as a clamping and / or tensioning channel 37, can be provided in which the fastening elements 38, designed as clamping and / or tensioning elements 38, are arranged, in particular for tensioning a rubber sheet.

[0024] The rubber cylinder 33 is preceded, with respect to the direction of the effective ink flow, by the form cylinder 32, which is designed, for example, as a plate cylinder 32 and which also has, for example, at least one fastening device with a fastening element 40 for holding and / or clamping a printing form. The plate cylinder 32 can have a channel 39, also referred to as a clamping and / or clamping channel 39, in which, for example, at least one fastening element 40, designed as a clamping and / or clamping device 40, is located for clamping a printing form onto the outer surface of the plate cylinder 32.

[0025] The printing unit 05; 06 can be assigned an automatic or semi-automatic plate changing device 41 in the area of ​​the printing unit superstructure 30 or superstructure module 30.

[0026] For inking the printing form, e.g., designed as a printing plate, at least one inking unit 42 is provided. The inking unit 42 of at least one, preferably several or all of the printing units 05; 06 is designed as a lift inking unit 42. In the case of the preferred design as a lift inking unit 42, the inking unit 42 comprises at least one ink tray 43 for receiving an ink supply, which may, for example, be designed as a chambered doctor blade or ink box 43, and a roller arrangement comprising at least one roller 44, e.g., an ink pickup roller 44, to be inked by the ink box 43, and preferably designed as a ductor roller or, more preferably, as an ink box roller 44, one or more further rollers 45, e.g., inking unit rollers 45, and preferably a spacer between the ink pickup roller 44 designed as an ink box roller 44 and a roller 46. B. a first inking roller 46 oscillating roller 47, for example lifting roller 47, e.g. a so-called ink lifter 47.The inking rollers 45 are distinguished, for example, as positively driven rollers 46; 48, e.g., inking rollers 46; 48, and as rollers 49, e.g., inking rollers 49, which are driven, for example, only by friction from the inking rollers 46; 48. For applying the ink, in particular printing ink, prepared by the inking rollers 45 onto the printing plate, several, preferably four in the exemplary embodiment, rollers 50, e.g., inking rollers 50, are provided. In an advantageous embodiment of the inking unit 42, the amount of ink dispensed from the ink reservoir in the ink box 43 to the ink receiving roller 44 can be adjusted. For this purpose, for example, at least one, preferably several, adjusting elements 79, also referred to as ink meters 79, are provided axially adjacent to one another, which is / are positioned at their end facing the ink receiving roller 44 at a distance δ. i are adjustable to the outer surface of the ink-receiving roller 44. This is preferably done by actuators not further specified.

[0027] In the direction of rotation 53 of the plate cylinder 32 during operation, a roller 52, e.g., a dampening roller 52, is optionally arranged upstream of the inking rollers 50. This dampening roller receives the dampening solution, for example, from a roller 65 immersed in a dampening solution reservoir, e.g., a dampening metering roller 65 (not shown in BZ). This roller is associated with a dampening unit 51, which is designed to apply dampening solution to the surface of the printing plate. A preferably switchable roller 54, e.g., a bridge roller 54, can be provided between an inking roller 50, the first in the direction of rotation 53 of the plate cylinder 32, and the dampening roller 52. This functionally enables a connection between the dampening unit 51 and the inking unit 42. In the case of the switchable design, this allows for several operating modes to optimize the dampening solution supply.

[0028] The last printing unit 06 is followed, for example, by a coating unit 07.

[0029] The sheet-fed printing press is available in one version, e.g., one that is in Fig. 1. A first drive motor 28 is schematically indicated. In addition to or instead of this, in a preferred embodiment, each plate cylinder 32 is provided with a drive motor 60; 61 which drives the respective plate cylinder 32 at least in a setup operation, directly or indirectly, mechanically independent of the first drive motor 28 (if applicable) and / or of other plate cylinders 32 (see, e.g., schematically in Figure 1). Fig. 1 and Fig. 2 indicated).

[0030] In a first embodiment, this at least one first drive motor 28 is designed, for example, as a main motor 28, in particular as a main drive 28, and drives, for example, a wheel train that forms a drive assembly. In the coupled state or during production operation, the drive assembly comprises, in particular, the printing cylinders 34; 36, the transfer drums 35, the rubber cylinders 33, the plate cylinders 32, the optionally provided coating unit 07, and the inking units 42. In a first embodiment of the preferred further development, a drive motor 60, acting as an auxiliary drive 60, is provided for each printing unit 05; 06. This auxiliary drive motor can act directly on the plate cylinder 32 or on a drive assembly that drives the plate cylinder 32 and the rubber cylinder 33, and through which, when the coupling to the drive assembly comprising the printing cylinders 34; 36 and the transfer drums 35 is disengaged, the plate cylinder 32, optionally the coating unit 07, is driven.together with the transfer cylinder 33 and / or the inking unit 42, it can be driven rotaryally, mechanically independently of the associated printing cylinder 34; 36, and in particular of the rest of the drive assembly. Such an auxiliary drive 60 can preferably be decoupled from the main drive 28 and used, for example, for positioning individual cylinders, in particular the form or plate cylinder 32.

[0031] Individual functional units of the sheet-fed printing press, such as the substrate feeder 01, especially the sheet feeder 01, the ink pickup roller 44 and / or any dampening units 51 provided, can preferably be driven by separate drives, in particular individual drives, i.e. without a mechanical and / or positive drive connection to drives of the other functional units and the drive assembly comprising the main motor 28.

[0032] In a second advantageous embodiment of the preferred further development, the additional drive motors 61 that drive the plate cylinders 32, at least during setup, are designed as separate drives 61, in particular individual drives 61, which drive the plate cylinders 32, optionally together with the respective transfer cylinder 33 and / or the inking units 42, mechanically independently of the associated printing cylinder 34; 36, in particular of the aforementioned remaining drive assembly, and / or independently of one or more plate cylinders 32 of one or more further printing units 05; 06 comprised of the printing press, even during production operation. In this case, at least the plate cylinders 32 are separated from the aforementioned drive assembly and driven solely by the separate drives 61, in particular individual drives 61, which are assigned only to the respective plate cylinder 32, optionally in conjunction with the associated transfer cylinder 33 and / or inking unit 42.without a mechanical and / or positive drive connection to the respective associated printing cylinder 34; 36 and / or to drives of the other plate cylinder(s) 32, and / or to a drive assembly comprising the main motor 28 and optionally to drives of other functional units such as the substrate feed device 01, the ink rollers 44 and / or the dampening units 51, the plate cylinder(s) 32 are moved rotaryally. The separate drives 61 or individual drives 61 of the plate cylinder(s) 32 can in particular be formed by so-called direct drives, whereby a direct drive is understood to be a drive 61 or individual drive 61 in which the drive motor 61 or its rotor, preferably without intermediate gear elements, is connected directly or optionally via a coupling in a coaxial arrangement to the drive shaft, in particular the journal, of the plate cylinder 32.The drive motor 61 is preferably designed such that the interposition of a gearbox can be dispensed with. The peripheral speed of the plate cylinders 32 is adapted to the peripheral speed of the cylinders interacting with the plate cylinders 32. According to another embodiment, several of the units 05; 06; 07, preferably each of the units 05; 06; 07, have their own drive motor 61 driving the drive assembly of the respective unit 05; 06; 07, but without being coupled to drives of other units 05; 06; 07 via a mechanical and / or positive drive connection. In this case, for example, the aforementioned main drive 28 can be omitted.

[0033] For example, paint shop 07 also has at least one of its own drives. Such a drive could be, for example, a direct drive and / or an auxiliary drive.

[0034] The sheets B are provided in the printing unit 09, which is designed, for example, as a sheet stack 09. The grippers, e.g., of the swing gripper 04, transfer the sheet B to grippers of a feed drum 29, through which the sheet B is transferred to the gripper system 57 of the printing cylinder 34 of the first printing unit 05.

[0035] Sheet B, now located on printing cylinder 34, is inked by the inking unit 42 via the form cylinder 32 and, in the case of offset printing, via the transfer cylinder 33. This occurs, for example, as follows: The ink, in particular printing ink, stored in the ink tray 43 (e.g., in the ink box 43), is metered zone by zone onto the ink pickup roller 44 (e.g., ink box roller 44) and preferably deposited as ink strips by the periodically moving ink lifter 47 onto the first inking roller 46 (e.g., ink rub roller 48). This roller transfers the ink via friction-driven inking rollers 49 to the rub rollers 48. The ink is then transferred via further inking rollers 45 to the ink application rollers 50 and thus onto the printing plate mounted on the plate cylinder 32. Viewed in the direction of rotation 53 of the plate cylinder 32, dampening fluid can be applied by the dampening roller 52 before the ink is applied by the ink application rollers 50.

[0036] The ink placed on the printing form is transferred to the rubber cylinder 33 in accordance with the motif and from there to the sheet B guided by the printing cylinder 34.

[0037] Sheet B is now transferred from the first printing unit 05 to the following printing unit 06 and, if necessary, subsequent printing units. This is done, for example, as follows: Sheet B is transferred from the gripper system 57 of the printing cylinder 34 to the gripper system 59 of the transfer drum 35 and thus guided through the entire sheet-fed printing press. In the individual printing units 05 and 06, the ink is then applied to sheet B via the respective transfer cylinders 33.

[0038] After sheet B has passed through printing units 05; 06, it can be coated with a layer of varnish in one or more varnishing units 07.

[0039] The sheets B, gripped at the leading edge, are transported by gripper carriages into the sheet delivery 08 and placed there.

[0040] The printing units 05; 06, each comprising, for example, one auxiliary or individual drive 60; 61, each have a form cylinder 32 and an inking unit 42 that inks the form cylinder 32 during operation, with a lifter roller 47 that can be moved back and forth between an ink intake roller 44 and a first inking unit roller 46 during production operation. Advantageously, the form cylinders 32 of at least two printing units 05; 06 are each mechanically rotatable independently of one another by a drive motor 60; 61 during production operation or at least during setup operation – e.g., for a printing form change, a washing process, or erasing or rewriting a cylinder-fixed printing form.

[0041] In the inking unit 42, encompassed by the printing unit 05; 06, a drive device is provided by which the lifting roller 47 can be moved back and forth during production operation. This can be driven directly by a drive motor with alternating direction of rotation or by a gearbox that converts rotation into a pendulum motion, either from its own drive motor or from another positively rotating body of the printing unit 05; 06, such as one of the printing unit cylinders 32; 33; 34 or inking unit rollers 49. Preferably, a positively driven cam drive 62, 63, 64 with a cam disk 62 and a roller lever 63 carrying a roller 64 is provided, by which the lifting roller 47 can be moved back and forth during production operation.In an advantageous embodiment, the cam disc 62 can be driven rotationally via a mechanical drive connection, preferably a belt drive, for example via a drive wheel (in particular a pulley) mechanically coupled to the drive of the mold cylinder 32, and an endless traction element (in particular a belt), from the drive motor 60; 61, which, for example, drives the mold cylinder 32 in production operation or at least in setup operation. Alternatively, the drive connection can be implemented via a gear train only. The cam disc 62 can also alternatively be driven by its own drive motor or by an inking roller.

[0042] The cam disk 62 can be single-turn, i.e., with only one highest point 68 with a largest radius and one lowest point 69 with a smallest radius, or it can be multi-turn. The roller lever 63 is pivotable about a pivot axis S, e.g., parallel to the axis of rotation of the ink-receiving roller 44, and carries, e.g., the roller 64 on one of its lever arms 66 and, offset on the same lever arm 66 or preferably on another lever arm 67, the lifter roller 47. The cam disk 62 and the roller lever 63, which carries the roller 64 and the lifter roller 47, are designed and arranged relative to the lifter roller 47 and ink-receiving roller 44 such that the lifter roller 47 is in contact with the first inking roller 46 when the roller 64 passes through a point 68; 69 of one limit radius, e.g., the largest radius, and when the roller 64 passes through a point 69; 68 of the other limit radius, e.g.of the smaller radius, in contact with the ink pickup roller 44.

[0043] In the case of a cam mechanism 62, 63, 64, it can be advantageous if the roller lever 63 is subjected to a force by a preloading device, e.g. a plunger pressed by a spring against a lever arm 66; 67 of the roller lever 63, so that the roller 64 is pressed securely against the cam track of the cam disk 62 in every phase.

[0044] Additionally, a mechanical locking device, e.g. a pneumatically actuated actuator with a plunger, can be provided by which the pivoting movement of the roller lever 64 can be restricted, in particular in such a way that pivoting of the lifting roller 47 against the ink receiving roller 44 in a locking position is prevented.

[0045] In a particularly preferable version (e.g., by way of example in Fig. 3) includes printed work 05; 06 (in Fig. 3 e.g. with one opposite Fig. (2 slightly different roller arrangement) a device 71, 72, 73 for removing printing ink located in the inking unit 42 - e.g. in the ink box 43 and / or on rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42 - also referred to as a washing device 71, 72, 73. This includes at least one removal device 71 which can be selectively connected to and disconnected from one of the rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42, by which fluid guided on the outer surface of the respective inking unit roller 44; 45; 46; 47; 48; 49; 50 in the engaged position, e.g. printing ink or printing ink enriched with cleaning fluid, can be removed.

[0046] In a particularly advantageous embodiment, the device 71, 72, 73 for removing printing ink comprises a device for introducing washing fluid 72; 73, for example, as a spray device 72; 73, in the circumferential area of ​​one of the rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42 and / or in the area of ​​the ink box 43.

[0047] Regardless of the type of drive for the pendulum movement of the lifting roller 47, but preferably in conjunction with the drive via a cam drive 62, 63, 64, means are provided – particularly for an operating mode of the printing unit 05; 06, e.g. for washing and / or during a period of time when washing the inking unit 42, i.e., removing the printing ink located in the inking unit 42, e.g. in the ink box 43 and / or on rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42 – by means of which a closed roller pull between the ink box roller 44 and the first inking unit roller 46 can be produced.

[0048] In one embodiment, this can be achieved by making the lifting roller 47 movable by appropriately arranged means into the gap between the two spaced-apart rollers 44; 46, i.e., the ink roller 44 and the spaced-apart first inking roller 46, until it is in contact or rolling contact with both the outer surface of the ink roller 44 and the outer surface of the first inking roller 46 (see e.g. Fig. 4) This can be realized mechanically in various ways. For example, the effective lever length of the lever arm 67 supporting the lifting roller 47, i.e., the length between the pivot axis S and the rotation axis R of the lifting roller 47, can be variable (indicated, e.g., in Fig. 4 (through the arrow), for example by making the lever arm 67 multi-part and its parts movable relative to one another, or by making the bearing that receives the lifting roller 47 movable on the lever arm 67. In another embodiment, a frame part supporting the pivot axis S for the roller lever 63 can be movable radially to the axis of rotation R of the lifting roller 47 within a frame of the printing unit 05; 06.

[0049] In an embodiment in which, for example, no manipulation takes place in the area of ​​the lifting mechanism and bearing, and therefore there is no risk of any necessary readjustment after washing, a roller bridge 74 with one or more, preferably two, further rollers 76; 77, e.g. bridge rollers 76; 77, is provided to create the closed roller train between the inkbox roller 44 and the first inking roller 46. This bridge can be positioned between the lifting roller 47, which is attached to one of the two rollers 44; 46, and the other of the two rollers 46; 44, such that the lifting roller 47 and the one or more further rollers 45; 48; 49; 50 form a closed roller train from the inkbox roller 44 to the first inking roller 46 (see, e.g., Fig.5) In this embodiment, the one or more bridge rollers 76; 77 can be mounted in the frame of the printing or inking unit 05; 06; 42 in such a way that they can be moved from a rest position to a working position between the lifting roller 47 attached to the inking unit roller 44 and the first inking unit roller 46, or, in a preferred embodiment, between the lifting roller 47 attached to the first inking unit roller 46 and the inking unit roller 44.

[0050] In a particularly advantageous sequence during the operation of the printing unit 05; 06 for removing printing ink from the inking unit 42, the ink supply to the ink box 43 is preferably interrupted before a planned interruption or the end of a production run.

[0051] This is achieved, for example, by interrupting, e.g., switching off, a preferably continuous, metered ink supply during normal production operation via a controllable and / or adjustable inlet, e.g., a controllable and / or adjustable feed device. This can be accomplished, for example, by an automated or at least remotely controllable ink supply via lines from a central ink storage facility, or by an automated or at least remotely controllable decentralized ink supply via metering systems provided, for example, on-site at ink unit 42, such as a cartridge system with an ink cartridge that can be emptied in a metered manner via an actuator.

[0052] The ink flow into the ink box 43 during the production run can advantageously be such that a specific quantity of ink per unit length of at most 1.0 g, in particular at most 0.6 g of printing ink per millimeter of effective inking unit width, i.e., the clear width between the two end walls of the ink box, is stored in the ink box 43. Additionally or instead, a maximum diameter of at most 20 mm, in particular at most 15 mm, of an ink roller 78 formed by the rolling of the printing ink on the rotating ink box roller shell can also be provided as a criterion.

[0053] During or after an interruption or completion of the production run, a closed roller contact is established between the inkwell roller 44 and the first inking roller 46. This can be achieved, for example, by moving the lifter roller 47 into the gap between the inkwell roller 44 and the first inking roller 46—e.g., using the aforementioned means—until it is in contact with both the inkwell roller 44 and the first inking roller 46. Preferably, however, this is achieved by positioning one or more of the aforementioned additional rollers 76; 77 between the lifter roller 47, which is positioned against the inkwell roller 44, and the first inking roller 46, or preferably between the lifter roller 47, which is positioned against the inking roller 46, and the inkwell roller 44, such that the lifter roller 47 and the one or more additional rollers 76; 77 a closed roller train is formed from the ink box roller 44 to the first inking unit roller 46.

[0054] Before, during or after the formation of the closed roller pull between the ink box roller 44 and the first inking roller 46, the one or more ink application rollers 50 are disengaged from the forming cylinder 32.

[0055] Preferably, the actual washing process starts with or after the inking rollers 50 have stopped, i.e., preferably, washing fluid is introduced into the inkwell 43 and / or onto one of the rollers 44, 45, 46, 47, 48, 49, 50 of the inking unit 42, and the removal device 71, e.g., designed as a doctor blade 71, is engaged on one of the rollers 44, 45, 46, 47, 48, 49, 50 of the inking unit 42. The introduction of the washing fluid and / or engagement of the removal device 71 preferably occurs with the actuating elements 79 on the inkwell 43 being open at least intermittently and the rollers 44, 45, 46, 47, 48, 49, 50 being rotating at least intermittently. 50 of the inking unit 42. In order to remove the residual ink from the ink box 43 as quickly as possible, the adjusting elements 79 are advantageously opened to more than half of the maximum adjustment range, but preferably to the maximum of the adjustment range towards a maximum opening.

[0056] The fluid formed by printing ink or enriched with cleaning fluid, which is to be removed during the washing process of the inking unit 42, is preferably taken off by the at least one removal device 71 and removed from the inking unit 42 when the inking rollers 50 have been switched off by the form cylinder 32.

[0057] The removal device 71 can be designed in various ways and may include a rotating brush or roller as a removal tool 81, or, advantageously, as a doctor blade device 71 with a doctor blade 81 that can be positioned against the cooperating roller 44; 45; 46; 47; 48; 49; 50 of the inking unit 42. The doctor blade 81 is, for example, formed by a base body made of sheet metal, which may have a plastic edge at its end that interacts with the roller 44; 45; 46; 47; 48; 49; 50 – e.g., pushed over the sheet metal.

[0058] Preferably, the removal device 71 is arranged to interact with the roller 44; 45; 46; 47; 48; 49; 50 of the inking unit 42 in such a way that it can be engaged and disengaged from the roller on the side rotating upwards in the production direction.

[0059] Preferably, the take-off device 71 is arranged in conjunction with a roller 44; 45; 46; 47; 48; 49; 50 of the inking unit 42, which is located in a first of several roller sections, viewed in the direction of rotation of the forming cylinder 32, of the roller arrangement which divides once or several times on the way from the first inking unit roller 46 to the inking application rollers 50.

[0060] To accelerate the removal of the printing ink from the inking unit 42, a device for introducing washing fluid 72; 73 is preferably provided at least in one area of ​​the ink box 43 or in the circumferential area of ​​one of the rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42. Preferably, a device for introducing washing fluid 73, e.g., designed as a spray device 73, is provided both in the area of ​​the ink box 43, which is directed, for example, into the area containing the printing ink in the ink box 43, and also in the circumferential area of ​​at least one of the rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42, which is directed towards the circumference of the respective roller 44; 45; 46; 47; 48; 49; 50.

[0061] The removal device 71 is preferably arranged to interact with a rotaryally driven roller 44; 45; 46; 47; 48; 49; 50. The removal tool 81 is, for example, mounted on a frame-fixed transverse connection 83, e.g., a crossbeam 83, which can be engaged and disengaged via at least two actuating mechanisms 82 spaced apart in the axial direction of the roller 44; 45; 46; 47; 48; 49; 50.

[0062] The actuating mechanism 82 advantageously comprises a remotely actuated actuator 84 for starting and stopping the removal tool 81. Although other drive means such as motors are also conceivable, the actuator 84 is a pressure-medium-actuated, in particular pneumatically actuated, cylinder-piston system 89, 91 with, for example, a cylinder 89 and a piston 91 movable therein, the frame-fixed part of which, for example, cylinder 89 or piston 91, is arranged directly or indirectly on the crossbeam 83 and the movable part of which, for example, piston 91 or cylinder 89, is connected via support elements 86, e.g., side parts 86, to a removal tool carrier 87, e.g., doctor blade carrier 87, which carries the removal tool 81 and / or to a removal tool carrier 87, e.g., a doctor blade carrier 87, which carries the removal tool 81. B. Rakelträger 87, carries.

[0063] In a particularly advantageous embodiment, the removal tool carrier 87 is detachably connected to the support elements 86, particularly manually, i.e., without the use of tools, and removable from the removal device 71. This detachable connection can, in principle, be formed by any type of clamping or locking mechanism. It can, in principle, be identical or different on both sides. Preferably, a locking mechanism can be provided as the detachable connection, for example, a spring-loaded latch on the support element 86, which engages positively in a recess or against a stop on the removal tool carrier 87, and whose positive locking can be released against the spring force. This latch can, for example, be operated by a manual actuating device 85, e.g.,a handle 85 or knob 85, provided and can be moved, for example, against a spring force from the locking position into an open position in which the removal tool carrier 87, possibly also with an axial component after a movement, can be removed from the removal device 71.

[0064] In a particularly preferred embodiment, a positive locking connection can be achieved on one side of the sides by means of rigid elements on the support element 86 and the removal tool carrier 87 by a relative movement such that movement in any direction perpendicular to the longitudinal extent of the removal tool 81, or at least in one direction in the plane of the doctor blade away from the roller 44; 45; 46; 47; 48; 49; 50, is prevented. For example, this can be a mandrel on the removal tool carrier 87 which can be moved into a corresponding recess on the side part 86 by lateral movement of the removal tool carrier 87, or conversely, a recess on the removal tool carrier 87 via a mandrel on the side part 86.

[0065] In a particularly advantageous embodiment, the removal tool 81 is detachably arranged on the removal tool carrier 87, in particular manually, i.e., detachable without the use of tools. This detachable connection 92, 93, 94 can, in principle, be formed by any type of clamping or locking mechanism. Preferably, however, it is a clamping connection 92, 93, 94. Here, for example, a strip 92; 93, e.g., a cover strip 92 and a support strip 93, can be moved towards each other via several screw connections 94 such that a squeegee 81 arranged between them can be clamped by the tensile stress and released again by opening the screw connections 94 when the tensile stress is released. The internal threaded portion of the screw connection 94 can be fixedly provided on one of the strips 92; 93 or at least be arranged on it in a rotationally secured manner, e.g., by means of an eccentric shape of a washer encompassing the internal thread and a stop.To enable manual closing and loosening, the screw encompassing the external thread can have a hand actuating device 96, e.g. a handle 96 or knob 96, which is connected to it in a rotationally fixed manner.

[0066] In an advantageous embodiment, a collection container 88, e.g. a collection tray 88, which can be removed independently of the removal tool 81 from the inking unit 42, is provided below the removal tool 81.

[0067] In an advantageous embodiment, a sensor for monitoring the presence of a removal, i.e., the operational presence of the collection container 88 and / or for monitoring the operational presence of the removal tool carrier 87 or removal tool 81, e.g., an optical sensor, is provided.

[0068] To facilitate the removal of the printing ink, an advantageous embodiment provides a device for introducing washing fluid 72; 73 in the area of ​​the ink plate 43 and / or in the circumferential area of ​​one of the rollers 44; 45; 46; 47; 48; 49; 50 of the inking unit 42. In an advantageous embodiment, such a device for introducing washing fluid 72; 73 is provided on the circumference of a roller 44; 45; 46; 47; 48; 49; 50 that is different from the roller 44; 45; 46; 47; 48; 49; 50 that interacts with the removal device 71. Reference symbol list 01 Substrate feeder, arc feeder 02 Conveyor section, belt table 03 Plant setup, arch system 04 Swing gripper 05 Work. Processing stage, printing unit, offset printing unit 06 Work, processing stage, printing unit, offset printing unit 07 Plant, processing stage, paint plant 08 Substrate dispensing device, sheet delivery 09 Packaging of printing material, stacks of sheets 10. Receiving device, stacking plate 28 Drive motor, main motor, main drive 29 Attachment drum 30 Printing mechanism superstructure, superstructure module, superstructure, module, first 31 Printing mechanism substructure, substructure module, substructure, module, second 32 printing cylinders, form cylinders, plate cylinders 33 printing cylinders, transfer cylinders, rubber cylinders, blanket cylinders 34 printing cylinders, printing cylinders, counter-pressure cylinders 35 Transfer drum, transfer drum, transferter 36 printing cylinders, printing cylinders, counter-pressure cylinders 37 Channel, clamping and / or clamping channel 38 Fasteners, clamping and / or tensioning devices 39 Channel, clamping and / or clamping channel 40 Fasteners, clamping and / or clamping devices 41 Plate changing device 42 inking unit, lift inking unit 43 Color template, paint box 44 Roller, ductor roller, ink box roller, ink pickup roller 45 Roller, inking roller 46 Roller, inking roller, first, inking friction roller, positively driven 47 Roller, lifting roller, paint lifter 48 Roller, paint rubbing roller, forced-driven 49 Roller, inking roller, friction driven 50 roller, paint application roller 51 Humidification system 52 Roller, dampening roller 53 Direction of rotation (32) 54 Roller, bridge roller 55 Pressure zone, pressure point, pressure gap 56 cylinder ports 57 Gripper system (34; 36) 58 arch support element, drum cap 59 Gripper system (35) 60 Drive motor, auxiliary drive 61 Drive motor, drive, single drive 62 Cam disc 63 roller levers 64 rolls 65 Roller, moistening metering roller 66 Lever arm, first 67 Lever arm, second 68th place, highest 69th place, deepest 70 - 71 Acceptance device, doctor blade device 72 Device for introducing washing fluid, spray device 73 Device for introducing washing fluid, spray device 74 roller bridge 75 - 76 rollers, further, bridge roller 77 rollers, further, bridge roller 78 Paint roller 79 Control element, color meter 80 - 81 Removal tool, squeegee 82 Adjustment mechanism 83 Cross connection, traverse 84 Actuator 85 Hand operating devices, handle, knob 86 Support element, side panel 87 Removal tool carriers, squeegee carriers 88 Collection container, drip tray 89 cylinders 90 - 91 pistons 92 Strip, cover strip 93 Strip, support strip 94 Screw connection 95 - 96 Hand operating devices, handle, knob δ i Distance B Substrate, arc-shaped, printing material, sheet R axis of rotation (47) S swivel axis

Claims

[1] Method for operating a printing unit (05; 06) of a printing press with a form cylinder (32) and an inking unit (42) inking the form cylinder (32) during operation, wherein the inking unit (42) is designed as a lift inking unit (42), comprising an ink tray (43) in which printing ink to be printed is stored during production operation and which has one or more adjusting elements (79) for setting an ink delivery quantity to an ink pickup roller (44) cooperating with the ink tray (43) for inking it, a first inking roller (46) of a roller arrangement extending from the first inking roller (46) to one or more ink application rollers (50) inking the form cylinder (32) during production operation, and a lift roller (47) moving back and forth between the ink pickup roller (44) and the first inking roller (46) during production operation, wherein a removal of printing ink from the inking unit (42) is done by - the supply of ink to the ink template (43) is interrupted before a scheduled interruption or end of a production run, - with or after interruption or termination of the production run, a closed roller train is produced between the ink intake roller (43) and the first inking roller (46) by placing two further rollers (76; 77) between the ink intake roller (44) and the first inking roller (46) between the ink intake roller (44) and the first inking roller (46) or between the ink intake roller (47) and the ink intake roller (46) in such a way that the closed roller train from the ink intake roller (44) to the first inking roller (46) is formed by the ink intake roller (47) and the two further rollers (76; 77), - before, during or after the formation of the closed roller pull between the ink intake roller (43) and the first ink roller (46), the one or more ink application rollers (50) are stopped, - and with or after the inking rollers (50) are stopped for washing, washing fluid is introduced into the inking tray (43) and onto a roller (44; 45; 46; 47; 48; 49; 50) of the inking unit (42), and a take-off device (71) is engaged on a roller (44; 45; 46; 47; 48; 49; 50) of the inking unit (42), which is located in a first of several roller sections, viewed in the direction of rotation of the forming cylinder (32), of the roller arrangement which divides once or several times on the way from the first inking unit roller (46) to the inking rollers (50). [2] Method according to claim 1, characterized by, that the washing fluid is introduced and / or the take-up device (71) is activated when the actuating elements (79) on the color template (43) are at least temporarily open and the rollers (44; 45; 46; 47; 48; 49; 50) of the inking unit (42) are at least temporarily rotating. [3] Method according to claim 1 or 2, characterized by , that after the scheduled interruption or end of the production run and before, during or after the stopping of one or more ink application rollers (50), the adjusting elements (79) are opened to more than half of the maximum adjusting range. [4] Method according to claim 1, 2 or 3, characterized by , that during the production run, before interrupting the color supply to the color template (43), a metered color supply is provided via a controllable and / or adjustable inlet. [5] Method according to claim 4, characterized by, that the inflow of printing ink into the ink tray (43) during the production run is such that at most 1.0 g of printing ink per millimeter effective inking unit width is stored in the ink tray (43) and / or that an ink roller (78) formed by the rolling of the printing ink on the rotating ink box roller shell has a maximum diameter of at most 20 mm.

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