EP3946948A1 - Rouleau de guidage permettant de guider une bande de matière à travers les composants d'une machine d'impression, machine d'impression et procédé de fabrication d'un tel rouleau de guidage - Google Patents

Rouleau de guidage permettant de guider une bande de matière à travers les composants d'une machine d'impression, machine d'impression et procédé de fabrication d'un tel rouleau de guidage

Info

Publication number
EP3946948A1
EP3946948A1 EP20705633.4A EP20705633A EP3946948A1 EP 3946948 A1 EP3946948 A1 EP 3946948A1 EP 20705633 A EP20705633 A EP 20705633A EP 3946948 A1 EP3946948 A1 EP 3946948A1
Authority
EP
European Patent Office
Prior art keywords
guide roller
groove
web
guide
roller body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20705633.4A
Other languages
German (de)
English (en)
Other versions
EP3946948B1 (fr
Inventor
Clemens Brinkmann
Thorsten Meyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP3946948A1 publication Critical patent/EP3946948A1/fr
Application granted granted Critical
Publication of EP3946948B1 publication Critical patent/EP3946948B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/022—Registering, tensioning, smoothing or guiding webs transversely by tentering devices
    • B65H23/025—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers
    • B65H23/0251—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers with a straight axis
    • B65H23/0256—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers with a straight axis with opposed helicoidal windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs

Definitions

  • Guide roller for guiding a web of material through components of a printing machine, printing machine and method for producing such
  • the invention relates to a guide roller for guiding a web of material through components of a printing press, a printing machine and a method for producing such a guide roller.
  • Guide rolls are used in a variety of treatment machines. In the present invention, printing machines are primarily considered. Guide rollers are used here for guiding and deflecting a material web to be printed. However, with many conventional guide rollers, in particular with small wrap angles, the negative effect occurs that the material web floats on the guide roller because of the air entrained between the guide roller and the material web. A lateral web offset can be the result, so that in many cases a print in register is not possible to a sufficient extent without taking countermeasures.
  • the European patent specification EP 0 046 236 B1 therefore proposes guide rollers which are made from a metal tube, the surfaces of which are sandblasted, then chrome-plated, ground and polished. Countless small indentations are created by sandblasting.
  • plateaus in the shape of a table mountain are produced in the areas outside these depressions.
  • the depressions are able to absorb the entrained air, so that the material web on the plateaus rests and is conveyed with a significantly increased adhesion to the guide roller.
  • the material web If the material web is now essentially placed on an area of the guide roller facing away from the direction of gravity (run-up edge), it usually first rests against the guide roller at the edges.
  • the individual sections of the material web viewed in the transverse direction, always lie against the roller in a direction that is perpendicular to the corresponding roller surface.
  • the material web since the adjacent surface areas of the material web adhere very well to the roller, the material web ultimately only has the option of forming creases in the middle in order to compensate for the deflection of the roller. This effect is particularly noticeable in the case of a very thin material web and / or those with a low modulus of elasticity.
  • the guide rollers In order to avoid this, the guide rollers must be made more massive so that the deflection can be reduced. The requirements regarding alignment accuracy and the stability of the machine frame are also very high. This generally leads to significantly higher costs for a printing machine compared to one that is equipped with conventional guide rollers. It is therefore the object of the present invention to provide a guide roller for a printing press with which the aforementioned disadvantages can be overcome or at least reduced.
  • a guide roller according to the invention which can be rotated in one direction of rotation about its main axis, comprises at least one groove and at least one web.
  • the web comprises at least regionally local depressions, which are plateau surfaces, the plateau surfaces being at a greater radial distance from the main axis than the local depressions.
  • the plateau surfaces can thus surround the local depressions, for example they can also enclose the local depressions.
  • “web” is to be understood as the complete circumferential surface of the guide roller in which no groove is made.
  • the groove also has additional local depressions.
  • the local indentations differ from the groove preferably at least in that the groove has a transverse width of at least 1 mm.
  • the local recesses have a width that is smaller than the groove width.
  • the maximum depth of the local depressions is also preferably less than the depth of the grooves.
  • the grooves in the circumferential direction of the guide roller have a length which is preferably at least 10% of the circumference of the guide roller, whereas the local depressions in the circumferential direction can have a length which is preferably less than 1% of the circumference of the guide roller.
  • the grooves - viewed from the plateau surfaces - can have a greater depth than the local depressions.
  • the grooves also differ from the local depressions in that, viewed in the circumferential direction of the guide roller, they are significantly longer and preferably circumferential.
  • the webs are also circumferential. Rollers with circumferential grooves are already known, but in these the webs are completely smooth and not provided with local depressions.
  • EP 0 046 236 B1 teaches replacing grooves exclusively with local depressions.
  • the inventors have recognized that neither one (grooves) nor the other (local depressions) is free of disadvantage. The inventors have recognized that a combination of the two possibilities not proposed in the prior art solves the problems.
  • the combination of the two possibilities according to the invention leads to the areas of the material web in the area of the webs that are in contact here being guided with strong static friction. This prevents the material web from swimming.
  • Each groove now offers the areas of the material web an area without a support surface into which the material web can retreat, since the material web has a somewhat greater length between the webs than the width of the respective groove, seen in the transverse direction. This means that the difference in length does not “build up” up to the middle of the guide roller, so that no wrinkles can be seen as in the prior art.
  • the reduction in length differences is more likely to be distributed over the entire web width and is not harmful in the further course of the printing process.
  • the groove and / or the web are designed to be circumferential in a spiral shape. Often, spiral grooves are ascribed a spreading effect. However, there are voices in the professional world who dispute this view. In the context of the invention, too, it can be assumed that the above-described effect also occurs without spiral grooves. A broad-stretching effect of spiral-shaped grooves is also to be denied in the inventive guide roller, since the web of material rests with strong static friction in this area due to the inventive design of the web and cannot be stretched out.
  • the spiral configuration of the groove and / or the web is made up other reasons in connection with the invention, because the material web is covered over its entire width by the groove and the web, so that differences in the transverse tension are not limited to individual, longitudinally oriented strips of the material web.
  • the middle plane is to be understood here as the plane which extends orthogonally to the axis of rotation of the guide roller and is essentially arranged in the center of the guide roller body.
  • the two halves of the guide roll are thus arranged symmetrically to the center of the web, which, as a whole, makes the run of the web of material more uniform when viewed from the center.
  • At least one groove leads from the center plane in the direction of one end of the guide roller. This means that if you follow the course of the groove from the center while the guide roller is rotating, this course leads to the outside.
  • the groove can in principle also lead from the outside to the inside, the observed effect also occurring.
  • At least two grooves are provided on each side of the central plane of the guide roller. So there are several, intermingled grooves provided, which regulates the distribution of the webs as a contact surface for the material web even better, so that the stresses acting on the material web remain limited to its small areas.
  • grooves that are wound into one another one outward and one inward running groove can also be provided on each side of the central plane. This shows a cross pattern on the outer surface of the guide roller.
  • the local depressions are located on each side of the central plane in an area that is at most over 50% of the distance from the central plane Front side of the guide roller extends.
  • the length of the material web can be large, so that it is only important in this area that the material web adheres better to the guide roller. Based on this knowledge, the introduction of local depressions can be dispensed with in some areas. This helps to reduce the manufacturing costs of such a guide roll.
  • a guide roller body which comprises the groove, the web and the recesses on its outer circumference, the guide roller body being made of a metal or a metal alloy, in particular aluminum.
  • a guide roller body is not only stable and inexpensive to procure, but it can also be processed in a very simple manner and thus quickly.
  • a guide roller body also referred to simply as a roller body in the following, is an essential component of the guide roller, on the outer circumference of which the material web can be guided.
  • Such a roller body can be rotatably supported, indirectly or directly, on an axis which is fastened, for example, in components of a printing machine frame.
  • a roller body can, however, also be provided with a shaft or with a shaft journal, so that the guide roller can be rotatably mounted in bearings which are supported, for example, in the printing machine frame.
  • Roller bodies and in particular shaft journals can also be designed in one piece.
  • a guide roller body which on its outer circumference comprises the groove, the web and the depressions, the guide roller body at least partially made of a plastic, in particular made of fiber-reinforced plastic and preferably of a carbon fiber-reinforced plastic (CFRP), consists.
  • CFRP carbon fiber-reinforced plastic
  • the weight of the guide roller can be kept as low as possible compared to a guide roller made of metal, which leads to a lower moment of inertia, which in turn is particularly advantageous for thin and / or sensitive material webs.
  • the above-mentioned object can also be achieved by a printing press which comprises a guide roller according to one of Claims 1 to 10. A web of material can be printed with this printing machine.
  • a gravure printing machine is particularly advantageous, which as a rule has a large number of guide rollers, so that the invention has a particularly positive effect here.
  • the advantages already described in connection with the guide roller according to the invention also apply in connection with the printing press according to the invention.
  • the above-mentioned object is also achieved by a method for producing a guide roller which comprises a cylindrical guide roller body, which is characterized in that the following processing steps are carried out:
  • a roller body which at least partially consists of a metal or a metal alloy, or at least partially comprises a plastic, in particular a fiber-reinforced plastic and preferably a carbon fiber-reinforced plastic (CFRP), is provided.
  • CFRP carbon fiber-reinforced plastic
  • a roller body made of a metal or a metal alloy has the advantage of being low in cost and being easy to work with.
  • a roller body, comprising a plastic has the advantage that it compared to a Roll body, comprising a metal or a metal alloy, is lighter with the same strength.
  • a cutting manufacturing process can advantageously be used to produce a groove.
  • a milling process is particularly preferred.
  • a turning method is also advantageous, particularly in the case of annular grooves.
  • those methods are advantageous in which the roller body performs feed movements in different directions, so that these methods can be carried out fully automatically. In this way, the groove can be produced very inexpensively.
  • a compressed air jet with solid blasting agent is used to produce local depressions in the web.
  • local depressions can be produced in a particularly simple manner in that the blasting medium hits the outer surface of the roller body with great force due to the acceleration by the compressed air, whereby the local depressions are created.
  • elevations are also created, into which the material that is shifted to create the depressions recedes. Since the elevations are usually not uniform in their fleas, it is advisable to follow the step of creating local depressions with a step for grinding the outer surface of the roller body, in which the elevations are essentially the same distance from the main axis of the roller body become. This creates plateau areas on which the material web later rests.
  • Compressed air blasting can also be used several times in succession, in particular with different blasting media. It is advantageous if a spherical abrasive, in particular glass beads, is used as the abrasive. These spherical projectiles enable uniform depressions. In this way, fissures in the depressions, but also in the elevations that arise, can be avoided, so that the elevations are only abraded for a comparatively short time must become.
  • Steel balls preferably stainless steel balls, can be used as blasting media, in particular when using compressed air blasting for the first time. Glass spheres are also suitable as blasting media, especially when compressed air blasting is used further.
  • a preferred embodiment of the method according to the invention provides that a machining production method, in particular at least one milling method, is used to create local depressions.
  • a machining production method in particular at least one milling method
  • the drilling of recesses can also be provided.
  • the roller body can remain in the same processing station for performing two processing steps.
  • the recesses can be selectively made at desired locations. For example, this procedure can be limited to the webs, whereby the grooves, in contrast to compressed air blasting, can be left out.
  • machining processes processes that can remove material are regarded as machining processes.
  • non-contact processes such as lasers.
  • FIG. 1 shows a schematic view of a multicolor rotogravure printing machine.
  • FIG. 2 shows a guide roller according to the invention with a first embodiment of a groove
  • FIG. 3 A guide roller according to the invention with another
  • FIG. 4 A guide roller according to the invention with another
  • FIG. 5 A guide roll according to the invention with another
  • FIG. 6 A guide roller according to the invention with another
  • FIG. 7 shows a guide roller according to the invention with an embodiment of a local depression
  • Fig. 8 A guide roll according to the invention with another
  • Figure 1 shows a schematic view of a multicolor
  • Gravure printing machine 1 as an example of a printing machine according to the invention, the gravure printing machine 1 being embodied in the so-called column construction.
  • This rotogravure printing press 1 shown as an example is shown with four printing units D1 to D4.
  • a rotogravure printing machine is not limited to this number of printing units.
  • Column designs can even be expanded in a modular manner, so that a user of such a printing press can use as many printing columns as he wishes.
  • a printing color is printed in each individual printing unit.
  • the material web 4 is fed to the printing press. Via guide rollers 3, preferably according to the invention the material web 4 arrives in the printing unit D1. There the material web 4 is guided over an impression roller P1.
  • This impression roller P1 can be adjusted in its height position in the direction of the double arrow y and can thus be set against the gravure cylinder T1. In this case, the material web 4 runs through the nip between the impression roller P1 and the gravure cylinder T1.
  • the material web 4 is printed with the print motif of a printing ink.
  • the material web 4 arrives at the printing unit D2 via further guide rollers 3. On the way to the printing unit D2, the material web 4 passes several drying devices, not shown, so that the printing ink printed in the printing unit D1 can dry sufficiently. Guide rollers 3 according to the invention can also be installed in the drying device.
  • the material web 4 again passes via further guide rollers 3 into the printing unit D3, where a third color can be printed.
  • the last printing unit D4 shown is not shown in print, i.e. That is, the impression roller P4 has been moved upwards so that the material web does not touch the gravure cylinder T4. In this printing unit D4, for example, all ink-carrying parts can be cleaned.
  • the material web 4 arrives via further guide rollers 3 to a feed device 5, which comprises a draw roller 6 and a pressure roller 7. Finally, the material web 4 arrives at a winding device 8, where it is wound into a roll.
  • FIG. 2 now shows a guide roller 3 according to the invention with a first embodiment of a groove.
  • This initially comprises the roller body 10, which has an outer surface 11.
  • the material web 4 is guided on parts of this outer surface.
  • the wrap angle of the material web 4 around the roller body can be between 1 ° and 180 °, but preferably between 5 ° and 120 °. The smaller the
  • the rotatable mounting of the guide roller 3 comprises a pin 12 at each of its two ends, which can be part of the roller body 10, a shaft or an axle.
  • the pins can be supported on components of the machine frame of a machine, in particular a printing press, via pivot bearings, or the roller body 10 is supported on the pin via pivot bearings.
  • this means that the guide roller can be rotated about the main axis 13, which is shown with a dash-dotted line, which is also illustrated by the arrow 14.
  • the direction of rotation can also run counter to arrow 14, as required.
  • the guide roller 3 according to FIG. 2 shows only one groove 15; embodiments of local depressions are not explained in this context. However, it goes without saying that this guide roller comprises such local depressions.
  • the groove 15 is circumferential in a spiral shape and runs from a first end to the second end of the roller body 10. It is shown that the groove 15 runs from right to left. This means that when the guide roller rotates in the direction of arrow 14, the groove represents a left-hand thread. Of course, the groove can also run in the opposite direction, that is to say from right to left, the effect of the invention occurring in the same way.
  • the areas of the outer surface 11 into which no groove is made can be referred to as web 16. According to the invention, local depressions, which will be discussed in greater detail below, are made in this web.
  • the guide rollers of the following embodiments also have one or more webs, without each going into detail.
  • FIG. 1 Another embodiment of a guide roller 3 according to the invention is shown in FIG.
  • Several grooves according to the invention are provided here, which are distributed in the axial direction over the outer surface 11 of the roller body 10.
  • the grooves 15 are designed to be circumferential and ring-shaped.
  • FIG. 1 Another embodiment of a guide roller 3 according to the invention is shown in FIG.
  • FIG. 1 Similar to the exemplary embodiment in FIG. 3 - several grooves 15 according to the invention are provided which, however, do not extend over the entire outer surface 11 of the roller body 10 in the circumferential direction. Rather, the circumferential angle of the grooves is less than 360 °, so that they are not circumferential.
  • FIG. 1 A further embodiment of a guide roller 3 according to the invention is shown in FIG. This embodiment is similar to the embodiment shown in FIG. However, two spirally extending grooves are provided which start or end at an imaginary dividing plane 17. This dividing plane 17 divides the roller body 10 into two parts, preferably in the middle. The central plane is aligned orthogonally to the main axis 13. It is also possible for a plurality of spiral-shaped grooves 15 running in the same direction to be pushed into one another, and one can then speak of a multi-start groove. This feature can also be applied to the exemplary embodiments in FIGS. 2 and 6.
  • FIG. 6 shows a further embodiment of a guide roller 3 according to the invention. This is similar to the embodiment according to FIG. 1, with two grooves running in opposite directions being provided here. It goes without saying that these grooves cross each other at numerous points.
  • the local depressions 18 are explained using the exemplary embodiment in FIG. In this exemplary embodiment, these can be provided in large numbers and distributed as desired on the webs. These depressions can be introduced, for example, by jets of compressed air, preferably using spherical projectiles, in particular small glass beads.
  • the local depressions can also arise within the grooves, but this does not, or at least not significantly, limit the effect of the invention. The reason is to be found in the fact that the depth of the local depressions is less than the depth of the grooves. More details on this are explained below with reference to FIG. In this exemplary embodiment, the lateral extensions of the local depressions are also smaller than the width of the grooves.
  • the lateral extent of a local depression is preferably less than half the width of a groove. It is also advantageous if the local depressions cover at least 20% of the area of the web or webs, but at most 80%. In some cases, the area coverage of the local depressions on the plains can be up to 99%. The remaining 1% or more that the plateau areas occupy can be a sufficient bearing surface for some sheet materials.
  • FIG. 8 now shows another embodiment of local depressions 18.
  • they are designed in particular to be elongated and can preferably be made in the webs by a machining production method, in particular by milling. It is also possible to keep the grooves 15 free of local depressions. With these local depressions 18 it is also provided that the width and / or the depth are smaller than the width and the depth of the groove.
  • FIG. 9 shows a further embodiment of the local depressions 18. In this embodiment, they are also designed in the form of grooves and can even be circumferential. Of course, a helical design of a groove is also conceivable. However, it is also true here that their width and / or their depth is less than the width and depth of the groove 15. Because of this configuration of the local recesses 18, it is also generally only possible to speak of “recesses”.
  • FIG. 10 now illustrates the different dimensions of the grooves 15 and the local depressions 18 of a guide roller according to the invention.
  • the grooves have a greater width than their depth; their width is preferably at least twice as large as their depth.
  • a groove preferably has a width of at least 1 mm, but in particular at least 2 mm.
  • the material web 4 has sufficient space available to be able to retreat into it, so that wrinkling can effectively be avoided.
  • the width of the local depressions is well below that of the groove and is preferably a maximum of 50% of that. In this case it can be assumed that the material web does not move back into this space, but that this space is essentially available to absorb the air entrained by the material web 4.
  • the depth of the local recesses 18 is preferably a maximum of 50% of the depth of the grooves 15, so that the local recesses can be produced in a cost-effective manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

L'invention concerne un rouleau de guidage (3) permettant de guider une bande de matière (4) à travers les composants d'une machine d'impression, qui peut tourner dans un sens de rotation autour de son axe principal (13) et qui comprend au moins une rainure (15) et au moins un brin (16). Le brin comprend, au moins par zones, des cavités (18) locales, qui sont adjacentes à des surfaces de plateau, lesdites surfaces de plateau se trouvant à une distance radiale supérieure de l'axe principal que les cavités locales.
EP20705633.4A 2019-02-08 2020-02-07 Machine d'impression avec un rouleau de guidage permettant de guider une bande de matière à travers les composantes de la machine d'impression Active EP3946948B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019201671 2019-02-08
PCT/EP2020/053170 WO2020161319A1 (fr) 2019-02-08 2020-02-07 Rouleau de guidage permettant de guider une bande de matière à travers les composants d'une machine d'impression, machine d'impression et procédé de fabrication d'un tel rouleau de guidage

Publications (2)

Publication Number Publication Date
EP3946948A1 true EP3946948A1 (fr) 2022-02-09
EP3946948B1 EP3946948B1 (fr) 2024-07-03

Family

ID=69593644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20705633.4A Active EP3946948B1 (fr) 2019-02-08 2020-02-07 Machine d'impression avec un rouleau de guidage permettant de guider une bande de matière à travers les composantes de la machine d'impression

Country Status (2)

Country Link
EP (1) EP3946948B1 (fr)
WO (1) WO2020161319A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405855A (en) * 1966-03-11 1968-10-15 Beloit Corp Paper guide and drive roll assemblies
DE3030917A1 (de) 1980-08-16 1982-04-01 Agfa-Gevaert Ag, 5090 Leverkusen Bahnleitwalze fuer hohe geschwindigkeiten und verfahren zu ihrer herstellung
US4914796A (en) * 1988-12-12 1990-04-10 Eastman Kodak Company Process for manufacturing nickel coated shot blasted web conveying roller
DE4340724A1 (de) * 1993-11-30 1995-06-01 Sigri Great Lakes Carbon Gmbh Mit Fasern verstärkte Kunststoffwalze mit Rautierung
US6177141B1 (en) * 1998-11-03 2001-01-23 Eastman Kodak Company Method for coating a liquid composition to a web using a backing roller with a relieved surface
DE202009012298U1 (de) * 2009-09-11 2009-11-19 Voith Patent Gmbh Leitwalze

Also Published As

Publication number Publication date
WO2020161319A1 (fr) 2020-08-13
EP3946948B1 (fr) 2024-07-03

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