WO2006136047A2

WO2006136047A2 - Printing cylinder covering, combination of printing cylinder and printing cylinder covering, and printing cylinder comprising a covering stuck thereto

Info

Publication number: WO2006136047A2
Application number: PCT/CH2006/000332
Authority: WO
Inventors: Andreas Zahnd
Original assignee: Maschinenfabrik Wifag
Priority date: 2005-06-23
Filing date: 2006-06-16
Publication date: 2006-12-28
Also published as: EP1896260B1; ATE454268T1; EP1896260A2; WO2006136047A3; DE502006005859D1; DE102005029167A1

Abstract

The invention relates to a printing cylinder covering (8) comprising a dimensionally stable angular front clamping flange (8a) and a dimensionally stable angular rear clamping flange (8b). The clamping flanges (8a, 8b) each form an at least essentially right angle (α-β) with an adjacent region of the printing cylinder covering (8), said angle being measured between the respectively adjacent region of the printing cylinder covering (8) and a tangent on the free end of the respective clamping flange (8a, 8b). The clamping flanges (8a, 8b) are identical and/or at least the front clamping flange (8a) is plane.

Description

Pressure cylinder lining, combination of pressure cylinder and pressure cylinder lining as well as pressure cylinder with clamped attached pressure cylinder lining

The invention relates to a covering which can be placed on a circumference of a printing cylinder of a rotary printing press and clamped in a clamping channel or two circumferentially offset from one another arranged clamping channels of the printing cylinder. The coating is referred to below as Druckzylinderbelag. It is used for ink transfer and can be in particular a printing plate, preferably a printing plate, for a printing form cylinder or a blanket for a blanket cylinder. The invention further relates to a combination of printing cylinder and printing cylinder pad and finally also a printing cylinder to which a printing cylinder pad is attached by clamping. The invention generally aims at rotary printing, but in particular it is concerned with web offset printing.

Widely used is the attachment of impression cylinder linings in axial clamping channels or a single clamping channel of a printing cylinder. For this type of attachment, the impression cylinder linings are angled at their relative to the direction of rotation of the respective printing cylinder end and an opposite, trailing end, so that at the leading end and the trailing end ever a short clamping flange is obtained, with which the respective impression cylinder cover in the clamping channel or a respective clamping channel protrudes and is clamped there by means of a clamping device. The printing cylinder coverings are usually plate-shaped, flexurally elastic body, such as printing plates, or have such a body as a carrier for a softer surface, as may be the case with blankets, for example. The leading and the trailing clamping flange are angled in each case in the known pressure cylinder linings dimensionally stable. The leading clamping flange closes with the area of the pressure cylinder lining, which is located on the other Side of the. Angled edge obtained adjoins an acute angle of, for example, 40, 50 or 60 ° in order to project into the respective clamping channel projecting its congruent, leading edge and in this way to secure the leading end positively and non-positively. The trailing Klemmilansch is angled for attachment separately from the leading end in its own nip at a right angle or for attachment together with the leading end of the same or another Druckzylinderbelags obtuse, for example, including an angle of 120 °. Such Druckzylinderbeläge are known from DE 103 14 343 Al, USP 4,421,024, USP 4,577,560 and DE 195 09 561 Al known. While these pressure cylinder coverings each have a flat clamping flange at the leading and trailing end, DE 100 03 937 A1 proposes a pressure cylinder lining which is initially angled at its leading end at right angles and subsequently bent in order to secure the leading end iri to the clamping channel. The trailing clamping flange can be shaped accordingly or simply angled right angled and flat.

Although the known Druckzylinderbeläge and impression cylinder allow secure attachment of the respective impression cylinder pad on the printing cylinder, the attachment and detachment of Druckzylinderbelags is cumbersome and increases in particular the complexity of change machines for a fully automatic change of Druckzylinderbeläge. Complex fully automatic machines describe the USP 5,709,150 and in particular the USP 4,727,807 offer a reasonably priced alternative semi-automatic, with which the trailing ends of the Druckzylinderbeläge pressed to attach the respective printing forme in the clamping channel and pulled to remove from the clamping channel, while the respective leading end by hand is hung and taken out. Such a change machine and its use as a semi-automatic describes the PCT / EP2005 / 0Ö4937.

It is an object of the invention to facilitate the change of printing cylinder coverings, but still secure the respective impression cylinder lining to a printing cylinder. The invention is based on a pressure cylinder lining, which has a dimensionally stable angled clamping flange at a leading end and an opposite, trailing end. The trailing end can be conventionally shaped, ie its clamping flange, which is referred to below as a trailing clamping flange, can be angled at least substantially at right angles. At least this corresponds to preferred embodiments. Basically, the trailing clamping flange with the adjoining region of the printing cylinder pad from which it is angled, also include a significantly greater angle than 90 °, for example, an angle of 110, 120 or 130 ° or possibly also an even blunter angle. It is only to ensure that the trailing clamping flange can protrude into a clamping channel of a printing cylinder. An at least substantially right angle is preferred, however, since a trailing end formed in this way can be pulled out of the clamping channel in a particularly simple manner and also pressed into the clamping channel.

According to the invention, the clamping flange of the leading pressure cylinder end, which is referred to below as the leading clamping flange, is under an at least substantially right angle to the connection region of the printing cylinder pad from which the leading clamping flange protrudes to form a leading edge. Therefore, the leading end can be particularly easily introduced into a clamping channel, namely simply pressed into the clamping channel, and from the clamping channel, ie a clamping gap formed in the clamping channel, to be pulled. An automatic change machine has to fasten and release the leading pressure forming end only an unavoidable from home, in relation to the axis of rotation of the printing cylinder radial or at least substantially radial feed or Abstellbewegung perform. In the preferred ideal case act in the imports and the removal of the leading clamping flange on this only compressive or tensile forces, but no lateral forces to the compression or tension direction, in particular no bending forces. The invention is based essentially on the recognition that the impression cylinder lining does not have to be brought into a rear grip for a secure hold on the impression cylinder even with its leading clamping flange. Rather, it is sufficient a purely-kraftschlüssige attachment in a nip. Preferably, the leading end and the trailing end are at least as far as the same shape that when attaching and loosening the impression cylinder pad either the leading or the trailing end can be attached or detached first. The direction of rotation of the printing cylinder can be freely selected for the purpose of changing the lining. Thus, the trailing end can be hung first and the printing cylinder driven in rotation against the production direction or the leading end hung first and the printing cylinder driven in the production direction to be driven in rotation. The freedom of choice achieved by the invention makes it possible, in particular, for printing units of so-called H-type construction to be mounted and removed on all printing forme cylinders of the printing unit in the same orientation relative to the respective printing forme cylinder. The shape symmetry of the impression cylinder linings with respect to the covering ends is particularly beneficial for the fully automatic lining change, in which both ends are automatically clamped and released by means of a change machine. For example, all Druckzylinderbeläge be aligned horizontally when the first clamped clamping flange is inserted into the respective clamping channel. When releasing the respectively last to be solved clamping flange all printing cylinder coverings can also be held in horizontal alignment.

Particularly preferably, the printing cylinder lining according to the invention is formed completely symmetrical with respect to its two ends. The direction of rotation of the printing cylinder plays in preferably exactly symmetrical coating ends irrelevant. In the case of not exactly symmetrical, but only substantially identically shaped, lining ends, they are so largely the same shape that even in this case the rotational direction does not play any role in the practical handling of the printing cylinder lining.

The preliminary clamping flange can be angled several times to increase the rigidity, ie be polygonal in the longitudinal section of the impression cylinder pad. Also, a clamping flange bent everywhere is conceivable and in principle also a combination of straight and bent flange sections. Such a clamping flange is concave polygonal or round or blended polygonal and round to the underside of the impression cylinder covering. Last but not least with regard to a simple production facility, a polygonal clamping flange should have at most three bends. Preferably, he is Angled only twice. The substantially right angle is measured between the adjoining the clamping flange portion of the printing cylinder pad, ie between the bottom or bearing surface of the printing cylinder pad, and a tangent to the free end, ie the outer free edge of the clamping flange. In preferably flat flange sections, the angle between the outermost of the flange sections and the underside of the impression cylinder lining is measured.

In the case of a preferably double-angled clamping flange whose inner flange portion which forms the edge with the adjoining portion of the impression cylinder cover should enclose an angle in the range of 90 ° to 105 ° with the underside of the impression cylinder lining and everywhere an equal length measured on the edge 2 to 5 mm. The outer flange section enclosing the inner flange section should have an equal length of 5 to 10 mm everywhere and be angled away from the inner flange section by 5 to 20 °. The blunter the angle included between the underside of the impression cylinder pad and the inner flange portion, the greater the angle that the outer flange portion is angled from the inner flange portion. In the case of a triple angled clamping flange whose innermost flange portion is preferably also at an angle from the range of 90 ° to 105 ° to the underside of the printing cylinder pad angle and has a length in the range of 2 to 4 mm. The central flange portion should have a length in the range of 2 to 4 mm and angled from the innermost flange portion by 5 to 15 °. The outermost flange portion should have a length in the range of 5 to 10 mm and be angled from the central flange portion by 5 to 15 mm. The multiple angled clamping flange is preferably clamped only in its outer and outermost flange portion. The Flanschäbschnitte are in both versions each plan.

In a likewise preferred second embodiment, the leading clamping flange is simply flat.

What has been said in the two embodiments above to the leading clamping flange applies in the preferred symmetrical embodiments in the same way for the each trailing Klemmfiansch. Although the leading clamping flange and the trailing Klemmfiansch preferably both correspond to either the first embodiment or the second embodiment, it should not be excluded that the two embodiments are combined with each other by, for example, a flat leading clamping flange with a polygonal trailing Klemmfiansch or more preferably a polygonal leading Clamping flange is combined with a plane trailing clamping flange.

The insertion into the channel, the clamping in the channel and the removal from the channel can be further facilitated if the clamping flanges are short, the length of the clamping flanges is measured in each case on the edge at which the respective clamping flange protrudes. Advantageously, the clamping flanges are each at most 15. mm and more preferably at most 10 mm long. In the case of a concavely curved, for example polygonal clamping flange, this length specification corresponds to the height of the front free flange end measured on the edge formed with the adjoining region of the impression cylinder pad, which can be measured on the underside of the impression pad.

Although the leading clamping flange with the adjoining portion of the impression cylinder pad preferably includes exactly an angle of 90 °, the advantages of the invention, however, can be achieved in principle even in the presence minor deviations from the 9 ° angle. Accordingly, at least substantially at right angles, angles of 90 ° ± 15 ° are also considered. A reduction compared to the right angle, ie towards more pointed Winkern, but must not cause the impression cylinder pad can not be pulled out of the terminal channel with the leading end, because a too strong and then harmful for removal can form positive fit , An angle of exactly 90 ° in both the leading and the trailing end is also advantageous in terms of narrowest possible Kanalöffhung on the Urnfangsfläche the cylinder, in particular in preferred embodiments in which the leading end and the trailing end or a trailing end of another Pressure cylinder pads are clamped in the same clamping channel in each case a separate nip. A multiple angled Clamping flange, however, is advantageous due to its increased rigidity, which is desired for insertion into the clamping channel.

The invention also relates, via the printing cylinder lining as such, to a combination of at least one printing cylinder and at least one printing cylinder lining. The at least one pressure cylinder lining forms both at a leading end and at a trailing end depending a dimensionally stable angled clamping flange, hereinafter also referred to as leading clamping flange and subsequent clamping flange, the leading clamping flange is angled at least substantially at right angles. The pressure cylinder is provided at its periphery with a clamping channel or with a plurality of clamping channels, which are arranged offset in the circumferential direction of the cylinder to each other. Preferred embodiments it corresponds, if in the circumferential direction of the printing cylinder in succession two Druckzylinderbeläge can be attached and the pressure cylinder accordingly has two mutually circumferentially offset clamping channels arranged. Ih axial direction are advantageously also several Druckzylinderbeläge side by side fastened to the impression cylinder, for the pads per axial section a single clamping channel or more clamping channels can be provided which are circumferentially offset from each other to the circumference only a single impression cylinder lining or successively more Druckzylinderbeläge to be able to order. Thus, four simple Druckzylinderbeläge or two Druckzylinderbeläge can be arranged in panoramic format on a double-width printing cylinder axially next to each other. For three-width printing cylinder side by side, for example, six single-sided printing cylinder coverings or three printing cylinder coverings can be arranged in panoramic format. The pressure cylinder is adjusted with respect to its clamping channel or its clamping channels to the inventively shaped leading end of the printing cylinder cover or the plurality of printing cylinder coverings. The clamping surface of a clamping gap against which the clamping flange is clamped adjacent, is preferably shaped so that the clamping flange are not deformed by the clamping force and thus a conditional by the acting clamping force behind engagement can not take place. This ensures ^' easy removal of the clamping flange. The invention furthermore also relates to a printing cylinder, on the circumference of which the impression cylinder covering described above for the combination is arranged. The printing cylinder has a clamping channel in which a clamping member is arranged, which forms a clamping gap for the leading clamping flange of the impression cylinder lining with a leading counter surface. The clamping member is elastically tensioned against the leading mating surface. The leading clamping flange of the printing cylinder pad is clamped in the clamping gap thus formed. The mating surface is referred to as leading because it forms the clamping gap for the leading Klemmfiansch with the clamping member. Although preferred, a leading edge of the clamping member arrangement of the leading counter surface is not mandatory, ie the leading counter surface may be arranged in principle trailing the cooperating clamping member.

Furthermore, the trailing end of the printing cylinder lining or, more preferably, a trailing end of a further impression cylinder lining is clamped in the clamping channel. In preferred embodiments, a further, trailing clamping gap for the trailing clamping flange is formed in the clamping channel with a further clamping member and a trailing counter surface, against which the further clamping member is elastically stretched. In principle, however, only one nip can be formed in the clamping channel, in which the leading and the trailing clamping flange are clamped on each other. The leading clamping flange would form the trailing mating surface in such a configuration, and the same clamping member would clamp both the leading and trailing clamping flanges. What has been said above with regard to the leading nip is preferably also valid for the trailing nip.

The printing cylinder lining of the combination and also the printing cylinder lining, which is already arranged on the printing cylinder isj, advantageously corresponds to the printing cylinder lining previously described as such. If a plurality of printing cylinder coverings are arranged or can be arranged on the printing cylinder, this advantageously applies to each of the plurality of impression cylinder coverings. The clamping member and, if present, the further clamping member is or are advantageously set in a direction parallel to the clamping flange in the clamping channel so that the position of the center of gravity of the clamping member and, if another clamping member is present, also the position of its center of gravity, itself can not change in a direction which is parallel both to the clamping flange and radially to the axis of rotation of the printing cylinder. This prevents that the clamping member follow the clamping flange when pulling out of the clamping channel and thereby the adhesion can strengthen. It is particularly preferred if a guide is formed in the clamping channel, which guides the clamping member movable at least substantially at right angles to a radial on the axis of rotation of the printing cylinder, wherein the radial extends through the opening of the clamping channel. By virtue of the guide, the clamping member is advantageously also supported radially outwards at the same time and fixed in this way as described above in order to prevent the frictional connection from being reinforced by pulling out the clamping flange.

The clamping member is preferably movably mounted in the clamping channel. Advantageously, it is rigid in itself, so that it does not deform under the forces acting on the clamping member during operation, including the clamping force to be exerted by it.

In order to obtain the clamping channel with the smallest possible opening, the clamping member forms in preferred embodiments a clamping portion in which it forms the clamping gap, and a guide portion in which it is guided itself, preferably in the manner described above. In a preferred embodiment, the clamping portion protrudes finger-like from the guide portion and towards the opening of the clamping channel. By providing a separate section for the function of guiding and for the function of clamping, the clamping section can be particularly slender, free of guiding functions in the circumferential direction of the printing cylinder. In particular, in preferred embodiments, in which the counter surface of the clamping portion is parallel to the outer peripheral surface of the impression cylinder to a extending through the channel opening radials, in this way the Kanalöffhung itself be kept narrow in the circumferential direction. If, as preferred, a further clamping member is provided for clamping a trailing clamping flange, the above statements also apply to the further clamping member.

A clamping force generating clamping device is preferably supported on the one hand on the clamping member and on the other hand on the other clamping member, so that the one of the clamping members each receives the clamping force for the other. If the clamping members each have said clamping portion and guide portion, it is further preferred if the tensioning means acts between the guide portions, and more preferably, when the tensioning means is arranged and tensioned between the guide portions. The clamping members lead with their guide sections advantageously each other, d. H. the guide sections form a compact unit, which are accommodated in a geometrically simple designable receiving space, which forms the guide for both clamping members. In particular, a filler piece which at the same time also forms one of the two boundary edges of the channel opening, form the guide of the at least one clamping member, preferably of the clamping member and of the further clamping member.

The clamping gaps are formed in direction of rotation in preferred embodiments.

Advantageous features are also described in the subclaims and their combinations, which may also be feature combinations per subclaim that already contain individually advantageous features.

Exemplary embodiments of the invention are explained below with reference to figures. The features disclosed in the exemplary embodiments form each individually and in each combination of features the subject-matter of the claims and also the embodiments described above. Show it:

Figure 1 is a Druckzylinderbelag invention in a first

embodiment, Figure 2 shows a clamping channel of a printing cylinder with a clamping device of a first exemplary embodiment and the clamped pressure cylinder lining, Figure 3, the clamping channel with the clamped pressure cylinder lining and a suction and rolling device in the introduction of the impression cylinder pad in the

Klemmkanal, Figure 4 the clamping channel with clamped pressure cylinder lining and the suction and

Rolling device in the application of the printing cylinder pad from the

Clamping channel,

FIG. 5 shows the pressure cylinder in a view onto the clamping channel,

FIG. 6 shows the attachment of a plurality of printing cylinder coverings on printing cylinders of one

Printing unit, Figure 7 is a Druckzylinderbelag invention in a second

embodiment,

FIG. 8 shows a modified impression cylinder lining of the first embodiment and

FIG. 9 shows a further modified impression cylinder lining of the first

Embodiment.

FIG. 1 shows a pressure cylinder lining 8 of a first embodiment in a longitudinal section. The printing cylinder pad 8 is an elastically bendable printing form for offset printing. Such Druckzylinderbeläge are generally formed as thin metal plates, which are each provided with an angled clamping flange before mounting on a printing cylinder, in the embodiment of a printing forme cylinder, in the imaged or still to be imaged area plan and at opposite ends. In that regard, the impression cylinder pad 8 corresponds to the usual printing forms. He has based on the direction of rotation of the printing cylinder at a leading end a leading clamping flange 8a and at a trailing end on a trailing clamping flange 8b. The clamping flanges 8a and 8b are dimensionally stable so that the printing cylinder pad 8 can be pressed with both clamping flanges 8 a and 8 b in a nip formed in a clamping channel of the printing cylinder for a clamping attachment of the printing cylinder pad 8. In this sense, the clamping flanges 8a and 8b are angled in a form-stable manner from the respectively adjoining region of the impression cylinder pad 8. Dimensionally stable means that the impression cylinder pad 8 under Retention of its angled clamping flanges 8a and 8b can be handled, especially when mounting on the impression cylinder and when removing. For practical purposes, the leading end and the trailing end of the printing cylinder pad 8 with the respective clamping flange 8a or 8b can be regarded as inherently stiff.

The two clamping flanges 8a and 8b are each angled at the same angle a, d. H. they conclude with the adjoining area of the printing cylinder pad 8 in each case the angle α. The angle α is 90 °. The impression cylinder pad 8 is symmetrical not only with respect to the included angle α, but also with respect to the length A of the clamping flanges 8a and 8b, d. H. the clamping flanges 8a and 8b have the same length A, measured in each case on the flange edge, d. H. on the subsequent region of the impression cylinder pad 8 in the plan state. The length A should be at most 15 mm and at least 7 mm, in the embodiment it is 9 mm.

Figure 2 shows a printing cylinder 1 in sections in a cross section. On an outer circumference of the impression cylinder 1, an axially extending clamping channel is formed, in which a separate clamping gap is formed for a leading clamping flange 8a and a trailing clamping flange 8b. If the pressure cylinder 1 has only a simple circumference, the clamping flanges 8a and 8b belong to the same pressure cylinder lining 8. A pressure cylinder 1 double or even larger circumference is the clamping flanges 8a and 8b different Druckzylinderbeläge 8. The clamping flanges 8a and 8b in the respective Clamping gap with a in all operating conditions of the printing cylinder 1 always the same, predetermined clamping force held.

hi the clamping channel, a clamping device is arranged, which comprises a clamping member 11, a further clamping member 15 and a arranged between the clamping members 11 and 15 clamping device 19. hu embodiment, the clamping device consists only of the clamping members 11 and 15 and the clamping device 19. The clamping device 19 is formed as a helical spring and acts as a compression spring. The illustrated compression spring can already form the tensioning device 19 alone or in combination with only one further compression spring or with a plurality of further compression springs. The compression spring or Compression springs of the tensioning device 19 is or are individually received in one or more bores of the Klernmglieds 11 and supported on the one hand at the bottom of its bore and on the other hand opposite the other clamping member 15 and biased. Alternatively, the further clamping member 15 could be provided with the bore or the plurality of holes. The clamping members 11 and 15 already store alone the tensioning device 19, so that the clamping device can be completely inserted according to the installed state pre-inserted in a receiving space of the clamping channel.

The clamping members 11 and 15 are each perpendicular to a radial R on the axis of rotation of the printing cylinder 1 reciprocally movable and are linearly stirred in this movement in the clamping channel. The axis of mobility is denoted by T. The radial R extends through the opening of the clamping channel and forms an axis of symmetry for the opening and an immediately adjacent portion extending radially inwardly to at least the ends of the clamping flanges 8a and 8b, ie the clamping channel is in this outer area to the radial R axisymmetric. In the axisymmetric region, a leading channel wall forms a mating surface 3 for the clamping member 11 and a trailing channel wall a counter surface 4 for the further clamping member 15. The clamping member 11 forms with the mating surface 3 a clamping gap for the leading clamping flange 8a, and the further clamping member 15 forms with the mating surface 4 a clamping gap for the trailing clamping flange 8b. The clamping device 19 presses the clamping member 11 against the clamping flange 8a and the further clamping member 15 against the clamping flange 8b. If no clamping flange 8a or 8b is clamped in the respective clamping gap, the clamping device 19 presses the clamping members 11 and 15 against the respective associated counter surface 3 or 4. The clamping flanges 8a and 8b lie flat on the respective associated counter surface 3 or 4. The mating surfaces 3 and 4 are parallel to the radial R. They therefore each enclose an angle, which is slightly smaller than 90 °, with a tangent applied directly to the outer edge of the impression cylinder 1 at the opening edge. The clamping flanges 8a and 8b are therefore preferably angled accordingly, ie they also close in the unloaded state of the impression cylinder pad 8 or the impression cylinder 8 with the respective plan area of the respective printing cylinder pad 8 each a congruent slightly smaller angle _. 90 °. However, the deviation from the exact right angle is so small that it does not matter for practical purposes. With the same orientation of the mating surfaces 3 and 4, the clamping flanges 8 a and 8 b could therefore be angled exactly below 90 °. Likewise, the mating surfaces 3 and 4 could point exactly radially to the axis of rotation of the printing cylinder 1. Due to the axial symmetry of the clamping channel in the radially outer region, ie in the clamping region, the drawn direction of rotation of the printing cylinder 1 can be reversed if necessary, so that the clamping flange 8b then the leading and the clamping flange 8a forms the trailing clamping flange.

The clamping members 11 and 15 are each designed as rigid in itself, one-piece components in the exemplary embodiment. The clamping member 11 is composed of a guide portion 12 and a right angle from the guide portion 12, in the installed state radially outwardly abspremmenden clamping portion 13 together. The clamping portion 13 is formed in the circumferential direction, ie in the direction of rotation of the printing cylinder 1, slender like a finger, in the embodiment as a plate-shaped, even axially narrow strip, the extent in the axial direction but significantly larger than in the circumferential direction. The further clamping member 15 is composed of a guide portion 16 and a clamping portion 17, for which the above to the clamping member 11 said also applies. Radially inwardly of the clamping portion 3, 4, the clamping channel widens to form a receiving space and a guide for the guide sections 12 and 16. The guide is, as already stated, a linear guide along the movement axis T. Against movements in the axial direction of the printing cylinder 1, the clamping members 11 and 15 are also secured. The guide is a radially outer guide 5 and a radially inner guide 6, which are each formed as a plane guide surfaces. The outer guide 5 further assumes the function of a support surface on which the clamping member 11 and the clamping member 11 and the further clamping member 15 are supported in a direction parallel to the clamped clamping flanges 8a and 8b directly on the. This ensures that in each case only the clamping force of the clamping device 19 can act in the two clamping gaps. The applied by means of the clamping device 19 clamping force is thus not in operation, ie not supported by the centrifugal force upon rotation of the printing cylinder 1. By a movement of the clamping members 11 and 15 is prevented parallel to the clamped clamping flanges 8a and 8b radially outward, the risk is counteracted that when pulling out of the Clamping flanges 8a and 8b from the respective nip by an advancement of the clamping members 11 and 15 reinforce the respective clamping force and the extraction of the clamping flanges 8a and 8b for releasing the impression cylinder pad 8 or the impression cylinder pads 8 difficult.

The delimiting walls of the clamping channel, in particular the mating surfaces 3 and 4 and the guides 5 and 6, are directly from a cylinder body of the printing cylinder

I and formed by a filler 7 inserted on the outer circumference. The filler 7 sits snugly in an axial groove on the outer circumference of the cylinder body. The filler 7 forms in particular the receiving space and the guide for the clamping members

II and 15. Furthermore, the filler 7 forms the leading counter surface 3. The trailing counter surface 4 forms directly the cylinder body.

Figure 3 shows the introduction of the leading clamping flange 8a in the nip. For introducing a suction and rolling device with rollers 9 and pneumatic suction cups 10 is used, which is deliverable from a parked position substantially in a direction radially to the axis of rotation of the printing cylinder 1 against the printing cylinder 1 and the printing cylinder 1 can be turned off. The suction and rolling device is located directly above the printing cylinder 1 or arranged to be movable in a substantially tangential direction to the printing cylinder 1 back and forth. The intake and Abstellhub is advantageously very short, for example, only a few inches long. Preferably, it is only a few millimeters longer than the clamping flanges 8a and 8b, so that the lifting movement is just sufficient to pull one of the clamping flanges 8a and 8b from its nip and the respective end of the printing cylinder pad 8 from the clamping channel. Figure 3 shows the last step in introducing the leading clamping flange 8a. The trailing end was previously already clamped in the clamping channel or at another clamping channel of the printing cylinder 1. Subsequently, the rollers 9, the printing pad 8 rolled over in the direction of its leading end and the impression cylinder pad 8 thereby applied to the cylinder surface. By rolling over almost to the height of the leading clamping flange 8a this is pressed into the nip formed between the clamping member 11 and the mating surface 3 until the state shown in Figure 3 is obtained. If from the impression cylinder pad 8 first the leading end 8a to be attached, the leading end is moved to the suction cups 10 hanging over the nip and then pressed by means of the suction cups 10 in the nip. If necessary, it is pressed with the rollers 9.

Figure 4 shows the extraction of the leading clamping flange 8a by means of the suction cups 10. For pulling out the suction cups 10 are brought as close as possible at the edge of the leading end in suction connection with the pressure pad 8 and the clamping flange 8a then simply pulled out of the nip. Further interventions are not required for the extraction, since it is ensured that only the clamping force of the tensioning device 19 predetermined by the construction acts in the clamping gap. In particular, the clamping device does not have to be actuated.

A preferred suction and rolling device is known from PCT / EP2005 / 004937 (55 114 XI), the disclosure of which is referred to. PCT / EP2005 / 004937 relates to a so-called semi-automatic, which is described in this application only in combination with a conventional pressure cylinder lining and accordingly only in a position to automatically pull a trailing clamping flange corresponding to the clamping flange 8b from the nip while the leading clamping flange conventionally formed there is attached by hand and pulled out of the clamping gap. By contrast, the suction and rolling device can be used both for automatic introduction as well as automatic withdrawal of the leading clamping flange 8a and the trailing clamping flange 8b.

FIG. 5 shows the printing cylinder 1 in a plan view of the clamping channel. The printing cylinder 1 is, as usual, divided into a plurality of pressure zones formed axially side by side. Accordingly, the printing cylinder 1 with axially adjacent to each other several printing plates 8 assignable. In FIG. 5, four single-sided printing forms 8 are arranged axially next to one another on the printing cylinder 1. Distributed over the circumference, in turn, a plurality of printing cylinder coverings 8 can be arranged one behind the other. The clamping channel extends axially from one end face of the printing cylinder 1 to the other continuously. In the clamping channel is per clamped Druckzylinderbelag 8 a Register device for adjusting the side register of the respective impression cylinder pad 8 is arranged. On both sides of the register devices a respective clamping device 11, 15 is arranged. Each clamping flange 8 a and 8 b is thus clamped by means of two pairs of clamping members 11 or 15.

FIG. 6 shows a printing unit arrangement with two printing gaps for a continuous web. The arrangement comprises two printing unit bridges, with four printing cylinders 1 and 2 per bridge. The upper bridge is in the shape of a flat V. The lower bridge corresponds to a flat V that is upside down. Overall, a so-called H-bridge is formed in this way. The impression cylinders 1 are covered with printing cylinder coverings 8 according to the invention and correspond to the printing cylinder 1 described above. The impression cylinders 2 are transfer cylinders and can in particular be blanket cylinders. They are each covered with at least one transfer cloth, which may be fastened in particular on a lining carrier having a leading end and a trailing end according to the invention. The printing cylinders 1 are each assigned a suction and rolling device 9, 10.

Figure 6 shows how the printing cylinder coverings 8 for all printing cylinders 1 of the H-bridge the respective clamping channel in the same orientation, in the embodiment, each horizontally, fed and can be inserted in this orientation in the respective nip. This facilitates, in particular, a fully automatic change of the printing cylinder coverings 8. The automatic change machines carry out the same feed movement in each of the printing cylinders 1 and the same discharge movement during removal. If each of the printing cylinder 1 is assigned its own change machine, all change machines can be formed equal in terms of their movement possibilities. If a common change machine is provided on both sides of the web depending on the pair of printing cylinders 1, this may be particularly simple due to the symmetry of the printing cylinder coverings 8, since it is for the two of him to be operated printing cylinder 1 for feeding and discharging the impression cylinder coverings 8 movements in each case in the same direction only needs to perform. A preferred change machine, which optionally one of several printing cylinders 1 with Druckzylinderbelägen 8 can operate, is disclosed in the German Patent Application no. 10 2004052 021, which is taken in this respect in reference.

Finally, magazines 20 are also shown in FIG. 6, one magazine 20 per printing cylinder 1 each. The magazines 20 each receive the printing cylinder coverings 8 of the associated printing cylinder 1. In order to keep the supply and Abführwege short and easy to make or the change machines, the magazines 20 are aligned so that the automatic change the new printing cylinder pad 8 in the feed from the associated magazine 20 and the removed impression cylinder pad 8 in the discharge in the associated Magazine 20 can move. The change machine thus comes with two movements, a movement in feed and discharge direction, which preferably points perpendicular to the web, and the feeding and Abstellbewegung.

FIG. 7 shows a pressure cylinder lining 8 of a second embodiment in a longitudinal section. The printing cylinder pad 8 has at its leading end and its trailing end per a polygonal clamping flange 8a and 8b. Also in the second embodiment, the printing cylinder pad 8 is symmetrical with respect to a central transverse axis of the printing cylinder pad 8 which extends in the axial direction of the printing cylinder. The clamping flanges 8a and 8b are each angled twice. An inner flange portion forming the edge with the adjoining area of the impression cylinder pad 8 has a length A and an adjoining outer flange portion has a length B, measured on the next inner edge. The length A is 3 mm. The length B is 6 mm. The inner Flanschäbschnitt encloses with the underside of the printing cylinder pad 8 an angle a of 95 °. The outer flange portion is angled from the inner flange portion towards the underside of the impression cylinder pad 8 by an angle ß of 15 °. The outer Flanschäbschnitt closes with the underside of the impression cylinder pad 8, wherein the impression cylinder lining is seen in the plan state, thus the angle a-ß of 80 °. The included between the two flange portions angle of 165 ° on the one hand is still so dull that the clamping flange 8a and 8b can be introduced as a simple flat clamping flange in the clamping channel and the respective intended nip, on the other hand is by the bending of the respective clamping flange 8a and 8b increases in their rigidity and thereby facilitates the imports into the clamping gap.

Figures 8 and 9 each show a printing cylinder pad 8 of the first embodiment, i. each with a simple planar clamping flange 8a and 8b. In contrast to the impression cylinder pad 8 of Figure 1, the clamping flanges 8 a and 8 b in the modified embodiment of Figure 8 each angled at an angle α of less than 90 ° and in the modification of Figure 9 each at an angle α of more than 90 ° , In the more acute-angled modification of FIG. 8, the angle a is 80 ° and in the obtuse-angled modification of FIG. 9 95 ° in each case. In both modifications, angles a are conceivable which deviate from the right angle by up to 15 °. Preferably, the printing cylinder coverings 8 and the two modifications with respect to their covering ends are exactly symmetrical.

Reference numerals:

1 impression cylinder, forme cylinder

2 impression cylinders, transfer cylinder

3 counter surface, channel wall

4 counter surface, channel wall

5 guide, support surface

6 leadership

7 filler

8 impression cylinder pad

8a leading clamping flange

8b trailing clamping flange

9 roll

10 suction cups

11 clamping member

12 guide section

13 clamping section 14 -

15 clamping member

16 leadership section

17 clamping section

18

19 clamping device

a angle a angle

A length

B length

Claims

claims

1. Druckzylinderbelag having a dimensionally stable angled leading clamping flange (8a) and a dimensionally stable angled trailing clamping flange (8b), wherein the clamping flanges (8 a, 8b) are shaped equal and each with a subsequent region of the Druckzylinderbelags (8) one at least in Include substantially right angle (cς a-ß), wherein the angle (ας a-ß) between the respective subsequent region of the impression cylinder pad (8) and a tangent to the free end of the respective clamping flange (8a, 8b) is measured.

2. impression cylinder lining according to claim 1, characterized in that the angle (cς a-ß) is at least 75 ° and at most 105 °.

3. impression cylinder lining according to one of the preceding claims, characterized in that the clamping flanges (8a, 8b) are round or preferably polygonal with respect to the respective subsequent region of the printing cylinder pad (8) and tiberall concave shaped.

4. impression cylinder lining according to one of the preceding claims, characterized in that the clamping flanges (8 a, 8 b) are angled several times, preferably twice, and in each case in the direction of an underside of the impression cylinder cover (8).

5. impression cylinder pad according to the preceding spoke, characterized in that the clamping flanges (8a, 8b) each have an inner flange portion which forms an edge with the respective subsequent region of the printing cylinder pad (8) and an angle of at least 80 ° and at most 110 ° includes.

6. impression cylinder lining according to the preceding claim, characterized in that the clamping flanges (8a, 8b) each have a second flange portion which is angled at least 5 ° and at most 20 ° from the respective inner flange portion.

7. pressure cylinder lining, which at a leading end of a plan, dimensionally stable and at least substantially right angled leading clamping flange (8a) and at a trailing end a plan, dimensionally stable and at least substantially rectangular or obtuse angled trailing clamping flange (8b).

8. impression cylinder lining according to the preceding claim, characterized in that the leading clamping flange (8 a) and the trailing clamping flange (8 b) are shaped equal.

9. impression cylinder lining according to one of the preceding claims, characterized in that the leading clamping flange (8a) and the trailing clamping flange (8b) measured on an edge about which the respective clamping flange (8a, 8b) is angled, each having a length (A; A, B) of at most 15 mm.

10. Combination of pressure cylinder (2) and Druckzylinderbelag (8) at a leading end and a trailing end depending on a plan, formstäbil angled clamping flange (8a, 8b) forms for clamping in only one or a respective clamping channel (3-6 ) of the printing cylinder (2), wherein the leading clamping flange (8a) is angled at least substantially at right angles.

11. pressure cylinder, comprising: a) a clamping channel (3-6), b) in the clamping channel (3-6) a clamping member (11) and a leading counter surface (3) against which the clamping member (11) is elastically tensioned, c) and a pressure cylinder lining (8) with a dimensionally stable and at least substantially angled angled leading clamping flange (8a, 8b), which is clamped between the clamping member (11) and the leading mating surface (3).

12. impression cylinder according to the preceding claim, characterized in that the center of gravity of the clamping member (11) is not parallel to the clamping flange (8a) is movable.

13. Printing cylinder according to one of the preceding claims, comprising a guide (5, 6), the clamping member (11) at least substantially at right angles to a radial (R) movably extending, which extends from the axis of rotation of the printing cylinder through an opening of the clamping channel ,

14. Printing cylinder according to one of the preceding claims, comprising a guide (5, 6) which guides the clamping member (11) linearly.

15. Druckzylmder according to any one of the preceding claims, characterized in that the clamping member (11) and the leading mating surface (3) clamp the clamping flange (8a, 8b) free of bending forces.

16. Printing cylinder according to one of the preceding claims, characterized in that the leading mating surface (3) by a flat side wall of the clamping channel (3-6) is formed which at least im.Wesen substantially parallel to a radial (R) on the axis of rotation of the Printing cylinder (2).

17. Printing cylinder according to one of the preceding claims, characterized in that the leading clamping flange (8a) at least in the area which has clamping contact with the clamping member (11), is flat.

18. Printing cylinder according to one of the preceding claims, characterized in that the clamping member (11) has a guide portion (12) and one of the Führungsäbschnitt (12) towards an opening of the clamping channel (3-6) in cross-section like a finger-like clamping portion (13 ) and in that a guide (6, 8) is formed in the clamping channel (3-6), which guides the guide section (12) in a transverse direction to the clamping flange (8a), so that the clamping section (13) acts on the leading counter surface (3). to and from the leading counter surface (3) is movable away.

19. A printing cylinder according to one of the preceding claims, comprising a tensioning device (19) which exerts on the clamping member (11) a resilient force which presses the clamping member (11) against the clamping flange (8 a).

20. Printing cylinder according to one of the preceding claims, comprising a further clamping member (15) which is stretched in the clamping channel (3-6) elastically against a trailing counter-surface (4), wherein between the further clamping member (11) and the trailing counter-surface ( 4) a trailing clamping flange (8b) of the same or another pressure pad (8) is clamped.

21. Pressure cylinder according to one of the preceding claims, characterized in that the trailing clamping flange (8b) at least in the region which in the same or another clamping channel (3-6) has clamping contact with a clamping member (15), is flat.

22 pressure cylinder according to a combination of the two preceding claims, characterized in that the clamping device (19) is supported in one direction on the clamping member (11) and in the opposite direction to the further clamping member (15).

23. Printing cylinder according to one of the two preceding claims in combination with claim 12, characterized in that the clamping device (19) between the clamping members (11, 15) is arranged.

24. Printing cylinder according to one of the three preceding claims, characterized in that the clamping members (11, 15) guide each other linear. T / CH2006 / 000332

25

25. Printing cylinder according to one of the four preceding claims, characterized in that the clamping members (11, 15) each have at least one, the associated clamping flange (8 a, 8 b) contacting the clamping portion (13, 17) and that the at least one clamping portion (13) of the clamping member (11) and the at least one clamping portion (17) of the further clamping member (15) in the axial direction of the printing cylinder (2) are arranged side by side and overlap at least partially in the circumferential direction.

26. Printing cylinder according to one of the preceding claims, characterized in that the pressure cylinder lining (8) is a Drackzylinderbelag (8) according to one of claims 1 to 9.