EP2253471A1 - Pressurised cylinder with rubber blanket for a roller offset printing press - Google Patents

Abstract

Apparatus for rotary offset printing press comprises print cylinder (30) with radially inward extending groove; rubber blanket (1) having three layers in main section (5), where first layer comprising self-adhering layer between print cylinder and rubber blanket; second and third layers having support and cover layer, where rubber blanket has leading end section (10) and trailing end sections (20) that directly adjoin main section and leading end section is inserted into groove of print cylinder. The apparatus further comprises gliding layer and an insertion aid.

Description

The invention relates to a printing cylinder with blanket for a web offset printing press according to the preamble of claim 1.

In web offset printing presses cylinders are used as rubber blanket cylinder, for example, wear a special, coated with rubber fabric as a so-called blanket.

The blanket is an important link in offset printing, which transfers the image and text information from the printing plate to the substrate (paper or film). The quality of a printed image is influenced, for example, by the structure, the materials used (fabric and rubber type) and, crucially, by the nature of the surfaces of the blanket.

In principle, a rough distinction can be made between incompressible rubber blankets and compressible rubber blankets, so-called air-cushion blankets.

Conventional, incompressible blankets consist of a fabric base layer and one or more layers of woven fabrics and interlayers (carcasses) as well as the actual rubber layer having a thickness of about 0.4 mm to 0.6 mm. The conventionally constructed blanket is almost incompressible, but deformable. This causes radial stresses to result in tangential displacement of the rubber and consequent beading.

Non-conventional, compressible blankets, also called air-cushion cloths, consist of a fabric base layer, a tissue interlayer with air pockets and a rubber cover layer. The air pockets are embedded either as the finest air bubbles or as air channels, whereby a ductility of the blanket is achieved overall. The bulge occurring in conventional blankets can be avoided here by compression of the tissue interlayer. At the same time the wear of the printing plate is reduced.

The printing cylinders are usually associated with such conventional or non-conventional, i. Layered rubber blankets covered, covered or glued. The invention described below relates to printing cylinders with self-adhesive blankets.

Known self-adhesive blankets are glued to the printing cylinder and must not be additionally attached to the printing cylinder. For this purpose, the blanket has a flat self-adhesive layer, with which it is adhered to the printing cylinder. The problem here is a joint at which the ends of the blanket abut each other or at which the ends of the blanket are at least opposite.

Such joints are sealed with sealants of all kinds against ingress of cleaning agents and printing ink. Often, the edges of the blanket are broken at the joints by grinding or milling prior to sealing. With seals of this type, there is a need for optimization to shorten the curing time of the sealant and thus to shorten the waiting time until the next usability of the printed cylinder with the rubber blanket. In addition, it is problematic that despite the sealant, cleaning agent and / or printing ink can penetrate between the ends of the glued rubber blanket and, in particular, dissolves the self-adhesive layer.

The invention is therefore based on the problem to improve a printing cylinder of the type mentioned in such a way that it no longer has the disadvantages described. In particular, the described joint problems of self-adhesive blankets should be solved by the self-adhesive layer between blanket and impression cylinder is reliably protected from penetration of solvents or ink. In addition, should be at this point the least possible attack surface for a blanket wash. Finally, the requirement of as narrow a non-printing strip as possible must be taken into account so that a joint width of approximately 3 mm is not exceeded.

This problem is solved by a printing cylinder with a blanket for a web offset printing press according to claim 1 and by a web offset printing press according to claim 15.

Advantageous embodiments of the invention are specified in the subclaims.

The printing cylinder has in a conventional manner a layered blanket, which is adhered with a self-adhesive layer on the printing cylinder. The blanket consists of at least three layers in at least one main section. From radially outside to radially inside, these are at least one outer layer facing away from the printing cylinder, a carrier layer and the self-adhesive layer facing the printing cylinder. The main section extends over the entire effective length of the blanket, which corresponds approximately to the circumference of the impression cylinder.

At the main portion now close to an advancing in the direction of production of the printing cylinder end portion and a trailing in the direction of production of the printing cylinder end portion of the blanket.

According to the invention it is provided that the pressure cylinder has radially outwardly at least one position of its circumference at least one radially inwardly directed channel into which at least the leading end portion of the blanket is inserted.

The channel is designed as an axial groove in the lateral surface of the impression cylinder. On the face side, this groove is normally open, with closed channels also falling within the scope of the solutions according to the invention. Also, the groove does not necessarily have to be in the axial direction. The groove can also run obliquely.

The trailing end portion of the blanket sticks according to a particularly simple variant on one side of the joint on the lateral surface of the printing cylinder, without being inserted into the channel. The trailing end is always pressed during operation of the web offset printing press against the printing cylinder, which counteracts unwanted detachment.

In an advantageous embodiment, both the leading end portion and the trailing end portion of the blanket are inserted into the channel.

The unusual first for the type of self-adhesive blankets providing a channel for introducing at least one end portion of the blanket in a radially inwardly directed channel of the printing cylinder has the great advantage that thereby the self-adhesive layer between the blanket and the impression cylinder is protected and none at all Sealing problem arises at a joint. The leading end portion or preferably both end portions of the blanket are now in the channel radially inwardly angled parallel to each other directly or indirectly to each other.

The self-adhesive layer usually ends at the radially outer edge of the channel, but can also end beyond only in the channel or even extend over the entire length of the blanket. In any case, the self-adhesive layer is protected at least at one end by the blanket itself.

In a particularly advantageous embodiment, the leading end portion and / or the trailing end portion relative to the main portion of the blanket on a reduced number of layers.

In this way, the end portions which are thinner compared to the main portion of the blanket can be better inserted into the channel. First of all, the thickness reduction alone is advantageous for uncomplicated insertion into a narrow channel. Thus, very narrow non-printing strips of the blanket or of the printing cylinder can be achieved.

In an advantageous embodiment, at least one of the end sections of the blanket has an insertion aid. The insertion aid is preferably arranged as a one-sided stiffening layer on the respective end portion. Particularly preferably, the insertion of metal, plastic or ceramic.

Such an embodiment initially facilitates the insertion of one or both end sections into the channel. In addition, an unintentional sliding out of the end sections from the channel can thus be made more difficult.

The insertion aid may preferably be formed as a one-sided stiffening layer on the blanket. In such a case, it is conceivable to make a fabric layer thickened or impregnated with a special plastic, so that one end section is stiffened. However, the end portions or layers of the end portions may also be advantageously made of metal, plastic or ceramic. Corresponding applications can also be subsequently applied to end sections which are to be inserted into the channel. Such introduction aids are particularly durable and, depending on the requirements, also particularly cost-effective.

In an advantageous embodiment, the leading or the trailing end portion has a sliding layer. Preferably, the sliding layer is permanently applied to the end portion. Particularly preferably, the sliding layer is a coating of polytetrafluoroethylene or other substances having lubricating properties. Such sliding layers facilitate the insertion of the respective end portion, since the friction between the channel wall and blanket is reduced. Whether a permanently attached sliding layer or a sliding layer to be applied in each application, for example consisting of fats, alcohol, or even Mixtures of hydrocarbons (gasoline, petrolatum) is chosen, depends on the type of use of the relevant pressure cylinder.

In an advantageous embodiment, at least one of the layers of the blanket is removed in at least one of the end sections. The advantage here is that such blankets can be made endless and can be reworked accordingly in the assembly in the end sections. For example, the layered construction makes it possible to cut an outer layer or several outer layers, so that the layers to be removed can be pulled off toward the ends starting from the cut.

In a particularly advantageous embodiment, the at least one removed layer comprises the self-adhesive layer or a plurality of layers facing the printing cylinder.

In the case of cutting the blanket or otherwise removing layers of the blanket on the side facing the printing cylinder on the side facing the printing cylinder, it is advantageous that the cover layer of the blanket remains intact into the channel. This surface is thus damaged at any point and still mechanically robust.

In an advantageous embodiment, the at least one removed layer comprises one or more layers of the blanket facing away from the printing cylinder.

The removal of radially outer layers of the blanket may be advantageous depending on the thickness and stiffness of the cover layer. For example, if the cover layer is particularly thick or stiff, the non-printing strip can be made particularly narrow when the cover layer is removed in the end sections.

In a particularly advantageous embodiment, the at least one end portion is releasably fixed in the channel. Particularly advantageously, the fixation is realized via an elastic deformation of the at least one end portion of the blanket. Here, the channel is executed in its width with slight undersize compared to the introduced end portions.

This type of fixation allows a complication-free attachment of one or both end portions in the channel and in many cases meets the requirements for safe operation of the web offset printing press. In addition, such a fixation is easy to solve when changing the blankets by the blanket is withdrawn radially outward.

In an advantageous embodiment, a strip is arranged adjacent to one of the end sections or alternatively between the end sections of the blanket.

In a further advantageous embodiment, the strip is alternatively connected as an insertion aid fixed to the blanket and thus introduced together with the end portion of the blanket in the channel. Alternatively, the bar is designed as a bar separate from the blanket.

For example, after both end portions of the blanket are inserted into the channel, the ledge can be pressed from the outside between the end portions, so that the impression cylinder is sealed to the outside and solvent or ink can not penetrate. Such strips may for example also be provided between the wall of the channel and the inserted end portion. This also has the consequence that it comes to the elastic deformation of this end portion of the blanket, the pressure cylinder is sealed to the outside tight and the end portions are securely fixed in the channel.

In an advantageous embodiment, at least one spring element is arranged adjacent to the at least one of the end sections of the blanket in the channel. Alternatively, a wall of the channel may be resilient. The aim is also in this advantageous embodiment, an elastic deformation of the effect at least one end portion. Spring elements solve this task particularly cost.

The channel is usually arranged parallel to the axis of the printing cylinder and directed radially inwardly. Thus, its center plane extends radially inward. However, this midplane does not have to extend exactly in the radial direction. In an advantageous embodiment, the median plane is inclined with respect to the radial plane which intersects the circumference of the impression cylinder together with the median plane of the channel.

For example, the leading end portion can be inserted at an acute angle to then track the trailing end portion at an obtuse angle in the channel.

In general, the printing cylinders described above are suitable for use in web offset printing presses.

The invention will be explained in more detail with reference to exemplary embodiments, which are illustrated in drawings.

Fig.1

einen Ausschnitt aus einem Radialschnitt durch einen Druckzylinder mit einer zwischen den Endabschnitten des Gummituchs in den Kanal ein- geführte Leiste,

Fig.2

eine Darstellung gemäß Figur 1, wobei jedoch lediglich ein End- abschnitt des Gummituchs ausgebildet und in den Kanal eingeführt ist,

Fig. 3

einen Ausschnitt aus einem Radialschnitt durch einen Druckzylinder mit einer zwischen dem Kanal und einem Endabschnitt angeordneten Leis- te,

Fig. 4

einen Ausschnitt aus einem Radialschnitt durch einen zum Druckzylin- der der Figur 3 vergleichbaren Druckzylinder, in dessen Kanal ein Fe- derelement vorgesehen ist,

Fig. 5

einen Ausschnitt aus einem Radialschnitt durch einen Druckzylinder, wobei von den in den Kanal eingeführten Endabschnitten in dem einen Fall radial äußere Schichten und in dem anderen Fall radial innere Schichten des Gummituchs entfernt sind,

Fig. 6

eine Darstellung gemäß Figur 5, wobei jedoch bei beiden in den Kanal eingeführten Endabschnitten die radial äußere Schicht des Gummi- tuchs entfernt ist,

Fig. 7

einen Ausschnitt aus einem Radialschnitt eines Druckzylinders mit ei- nem Kanal, der schräg radial einwärts gerichtet ist, und

Fig. 8

einen vollständigen Radialschnitt eines Druckzylinders mit einem Ka- nal, der mit den Kanälen in den Figuren 1 bis 6 korrespondiert.

Show it:

Fig.1

a detail of a radial section through a printing cylinder with a ledge introduced between the end sections of the blanket in the channel strip,

Fig.2

a representation according to FIG. 1 but only one end portion of the blanket is formed and inserted into the channel,

Fig. 3

4 a section of a radial section through a pressure cylinder with a bar arranged between the channel and an end section;

Fig. 4

a section of a radial section through a to the printing cylinder of FIG. 3 comparable pressure cylinder, in whose channel a spring element is provided,

Fig. 5

a section of a radial section through a printing cylinder, wherein removed from the introduced into the channel end portions in the one case radially outer layers and in the other case radially inner layers of the blanket,

Fig. 6

a representation according to FIG. 5 but in both end sections inserted into the channel the radially outer layer of the blanket is removed,

Fig. 7

a section of a radial section of a printing cylinder with a channel which is directed obliquely radially inwardly, and

Fig. 8

a complete radial section of a printing cylinder with a channel, with the channels in the FIGS. 1 to 6 corresponds.

FIG. 8 shows in the form of an overall view a complete radial section through a printing cylinder 30, 30 ', 30 "according to the invention with a blanket 1, 1', 1" for a web offset printing press. An axis A extends centrally in the impression cylinder 30, 30 ', 30 ". A channel 34, 34', 34" directed radially inwards is provided parallel to the axis A at the circumference of the impression cylinder 30, 30 " , 34 ', 34 "are two end portions 10, 20, 20', 20" of the fully on the printing cylinder 30, 30 ', 30 "attached blanket 1, 1', 1" introduced, wherein the first end portion 10 in a direction of production P The pressure cylinder 30, 30 ', 30 "leading and the second end portion 20, 20', 20" formed trailing. Between the end portions 10, 20, 20 ', 20 "extends to the end portions 10, 20, 20', 20th "adjacent over almost the entire circumference of the printing cylinder 30, 30 ', 30" a main portion 5 of the blanket 1, 1', 1 ".

A first of the general view according to FIG. 8 detected embodiments is in FIG. 1 shown. A section of a radial section of the printing cylinder 30, the area around the channel 34 is enlarged.

The channel 34 has a channel depth 36 and a channel thickness 38. With these dimensions, a groove in the lateral surface of the impression cylinder 30 is defined, which receives the end portions 10, 20 of the blanket 1.

The blanket 1 is multi-ply, d. H. constructed with several layers 2, 3, 4 in the radial direction. Each of the layers has a special function. Not shown are other layers that may be present and well known. Radially inside the printing cylinder 30 facing a self-adhesive layer 4 of the blanket 1 is glued to the printing cylinder 30. Radially outward directed is followed by a carrier layer 3, which is usually formed from a fabric. Radially on the outside, the rubber blanket 1 has a cover layer 2 facing away from the printing cylinder 30. The cover layer 2 fulfills the respective criteria with regard to the surface for producing a perfect print image on the printing material, which is not shown.

This layer construction is almost over the entire circumference of the blanket 1, i. in its main section 5, completely formed. At the end portions 10, 20 adjoining the main portion 5, starting from radially outer edges 11, 21 of the channel 34, the self-adhesive layer 4 and the carrier layer 3 are removed radially inward. The end portions 10, 20 of the blanket 1 are thus introduced in the first embodiment only with a reduced thickness, namely the thickness of the cover layer 2 in the channel 34.

Between the end sections 10, 20 of the rubber blanket 1, after introduction of the end sections 10, 20, an insertion aid 7 designed as a strip 9 is introduced into the channel 34 in the radial direction. In the circumferential direction, the end portions 10, 20 are clamped by the thickness of the strip 9 in comparison to the channel thickness 38 in the channel 34. The end portions 10, 20 are elastically deformed. Alternatively, the Insertion aid 7 may also be formed as a one-sided stiffening layer on the respective end portion 10, 20, which consists of metal, plastic or ceramic.

The success resulting from the arrangement according to the first embodiment is a complete sealing of the self-adhesive layer 4 to the outside. The inserted into the channel 34 end portions 10, 20 of the blanket 1 are inserted into the channel 34 around the radially outer edges 11, 21 around, inserted or inserted and additionally fixed by the bar 9 in the channel 34. The channel 34 is undersized with respect to the inserted end portions 10, 20 and the ledge 9, so that the end portions 10, 20 are clamped in the channel 34 without the need for further equipment. This results in a secure seal to the outside.

As in FIG. 2 shown, in a second embodiment with the leading end portion 10, only a single end portion of the blanket 1 is formed and inserted into the channel 34. As a result, a narrower channel 34 and thus an even narrower, non-printing strip of the blanket 1 or of the printing cylinder 30 can be realized. In addition, the blanket 1 can be made easier in this way, ie there is only one cut of the blanket 1 to the required length.

FIG. 3 represents a third embodiment. Comparable to the representation in FIG. 1 again a section of a radial section of the printing cylinder 30 'is shown with glued blanket 1'. In the pressure cylinder 30 'is comparable to FIG. 1 a channel 34 'with a channel thickness 38' and a channel depth 36 'is formed.

The blanket 1 'is also comparable to the representation in FIG. 1 the printing cylinder 30 'facing at the level of the radially outer edges 11, 21 of the channel 34' is cut. The self-adhesive layer 4 and the carrier layer 3 are in the second embodiment to the respective end portions 10, 20 'of the blanket 1 'deducted. The blanket 1 'is therefore also introduced with respect to the main portion 5 thinner end portions 10, 20' in the channel 34 '.

In the channel 34 'is arranged between the trailing end portion 20' of the blanket 1 'and a wall 22 of the channel 34' also designed as a bar 14 insertion aid 7. The strip 14 is attached according to a preferred embodiment of the invention at the trailing end portion 20 'and introduced together with this in the channel 34'. This arrangement is particularly easy to install, because the leading end portion 10 can initially be introduced without problems in the channel 34 '. The trailing end portion 20 'must, in order to achieve a secure seal of the self-adhesive layer 4 against solvents or ink, are pressed into the channel 34', so that there is an elastic deformation of the end portions 10, 20 '. For this purpose, the channel 34 'with respect to the thickness of the end portions 10, 20' and the bar 14 executed with undersize.

In order to facilitate the insertion of the trailing end portion 20 'in the channel 34', the wall 22 of the channel 34 'or the bar 14 may be provided on the wall 22 side facing with a sliding layer 6. This overlay 6 can be applied to the corresponding surfaces in a change of the blanket 1 '. The strip 14 or the wall 22 may alternatively or additionally be equipped with durable sliding layers 6. Such sliding layers 6 consist for example of polytetrafluoroethylene or other substances with sliding properties. The end portions 10, 20 'of the blanket 1' are preferably at least partially made of metal, plastic or ceramic, which may also have sliding properties.

FIG. 4 shows an enlarged section of a radial section of a printing cylinder 30 "comparable to the impression cylinder 30 'of FIG. 3 in a fourth embodiment.

Unlike the picture in FIG. 3 a spring element 8 is provided in a channel 34 "between the strip 14 and the wall 22. The spring element 8 is itself deformable and causes an elastic deformation of the introduced into the channel 34 "end portions 10, 20 'of the blanket 1'. Such spring elements 8 are the skilled person in addition to the in FIG. 4 illustrated embodiment of a curved sheet also known in other forms. For example, as a substitute over the length of the channel 34 "distributed spiral spring elements are conceivable, which can also lead to an elastic deformation of the end portions 10, 20 'of the blanket 1'.

FIG. 5 shows a detail of a radial section of a fifth embodiment. The illustrated printing cylinder 30 'also has a channel 34' with a channel thickness 38 'and a channel depth 36' in its lateral surface as in the preceding exemplary embodiments.

Analogous to the preceding embodiments, a blanket 1 "is attached to the printing cylinder 30 'with a self-adhesive layer 4. The main section 5 of the blanket 1" again has the usual layered structure, i. In addition to the self-adhesive layer 4, a carrier layer 3 and a cover layer 2 are formed. In contrast to the preceding embodiments, however, the cover layer 2 is removed at the trailing end section 20 "Otherwise, a strip 14 is also provided in this embodiment between the wall 22 of the channel 34 'and the trailing end section 20" of the blanket 1 " the trailing end portion 20 "easier.

The FIG. 6 shows a next embodiment, in which both the leading and the trailing end portion 10, 20 "of the blanket 1", the cover layer 2 is removed. This specifies a further alternative solution which can be used depending on the configuration of the web offset printing press.

In FIG. 7 is a further embodiment of a printing cylinder according to the invention 30 '' shown, in comparison to the overview representation according to FIG. 8 deviating executed. The difference from the previously described Embodiments consist in the orientation of the channel 34 "'obliquely radially inwardly into the interior of the printing cylinder 30"'.

Another deviation is the removal of layers of the end portions 10 ', 20 "' inserted into the oblique channel 34" '.

In this embodiment, the in the production direction P of the printing cylinder 30 "'leading end portion 10' at an acute angle α in the channel 34" 'hung. In order to facilitate the insertion of the leading end portion 10 'in the oblique channel 34' ', in the illustrated embodiment, the cover layer 2 of the blanket 1' 'over the end portion 10' away. Thus, only the carrier layer 3 and optionally the self-adhesive layer 4 are introduced into the channel 34 "'.

In general, however, the self-adhesive layer 4 always ends at the radially outer edge 11, 21 of the channel 34, 34 ', 34 ", 34"' in order to prevent the insertion and removal of the respective end sections 10, 10 ', 20, 20'. 20 ", 20" 'of blanket 1,1', 1 ", 1" 'not to complicate.

Is the blanket 1 "'in the embodiment according to FIG. 7 The trailing end portion 20 "'is inserted into the channel 34"' at an obtuse angle of 90 ° + α around the printing cylinder 30 "'and adhered to it.

The trailing end portion 20 "'facing the wall 22 of the channel 34"' and the leading end portion 10 'of the blanket 1 "' facing away from a bar 14 ', which facilitates the insertion of the trailing end portion 20"'.

Parallel to the inserted end portions 10 ', 20 "' extends a median plane M of the channel 34" 'which makes an angle α to a radial plane R of the impression cylinder 30 "' which intersects the circumference thereof with the median plane M of the channel 34" ' ,

Claims (15)

Printing cylinder (30, 30 ', 30 ", 30"') for a web offset printing press, with a blanket (1, 1 ', 1 ", 1"'), at least in a main section (5) at least three layers (2, 3 , 4), a pressure cylinder (30, 30 ', 30 ", 30"') facing, self-adhesive layer (4), with which the blanket (1, 1 ', 1 ", 1"') on the impression cylinder ( 30, 30 ', 30 ", 30"'), a carrier layer (3) and a printing cylinder (30, 30 ', 30 ", 30"') facing away from cover layer (2), wherein on the blanket (1, 1 ', 1 ", 1"') in the production direction (P) of the printing cylinder (30, 30 ', 30 ", 30"') leading end portion (10, 10 ') and in the production direction (P) of the printing cylinder (30 , 30 ', 30 ", 30"') trailing end portion (20, 20 ', 20 ", 20"') are formed, which directly adjoin the main portion (5), characterized in that the pressure cylinder (30, 30 ', 30 ", 30"') has a radially inwardly directed channel (34, 34 ', 34 ", 34"') into which at least the vorla ufende end portion (10, 10 ') of the blanket (1, 1', 1 ". 1 ") is introduced. Printing cylinder (30, 30 ', 30 ", 30"') according to claim 1, characterized in that also the trailing end portion (20, 20 ') of the blanket (1, 1', 1 ". 1") in the channel ( 34, 34 ', 34 ", 34"') is introduced. Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that at least one of the end sections (10, 10 ', 20, 20', 20 ", 20"') of the blanket (1 , 1 ', 1 ", 1"') has a reduced number of layers (2, 3, 4) relative to the main section (5). Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that at least one of the end sections (10, 10 ', 20, 20', 20 ", 20"') of the blanket (1 , 1 ', 1 ", 1"') has an insertion aid (7), the insertion aid (7) preferably being in the form of a one-sided stiffening layer on the respective end section (10, 10 ', 20, 20', 20 ", 20"'). ) is arranged and particularly preferably made of metal, plastic or ceramic. Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that at least one of the end sections (10, 10 ', 20, 20', 20 ", 20"') of the blanket (1 , 1 ', 1 ", 1"') has a sliding layer (6), which is preferably permanently applied to the end section (10, 10 ', 20, 20', 20 ", 20"'), particularly preferably in the form of a Coating of polytetrafluoroethylene or other substances with sliding properties. Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that in at least one of the end portions (10, 10 ', 20, 20', 20 ", 20"') at least one of Layers (2, 3, 4) of the blanket (1, 1 ', 1 ", 1"') is removed. Printing cylinder (30, 30 ', 30 ", 30"') according to claim 6, characterized in that the at least one removed layer (2, 3, 4) the self-adhesive layer (4) or more of the impression cylinder (30, 30 ', 30 ", 30"') facing layers (3, 4) of the blanket (1, 1', 1 ", 1"'). Printing cylinder (30, 30 ', 30 ", 30"') according to claim 6, characterized in that the at least one removed layer (2, 3, 4) one or more of the printing cylinder (30, 30 ', 30 ", 30 '') facing away layers (2, 3) of the blanket (1, 1 ', 1 ", 1"'). Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that the at least one end portion (10, 10 ', 20, 20', 20 ", 20"'), in particular by elastic Deformation, releasably fixed in the preferably undersized channel (34, 34 ', 34 ", 34"') is fixed. Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that a strip (14, 14 ', 9) adjacent to at least one of the end sections (10, 10', 20, 20 ' , 20 ", 20"') in the channel (34, 34', 34 ", 34"') is arranged. Printing cylinder (30, 30 ', 30 ", 30"') according to claim 10, characterized in that the strip (14, 14 ') between a wall (22) of the channel (34, 34', 34 ", 34"' ) and an end portion (10, 10 ', 20, 20', 20 ", 20"') of the blanket (1, 1', 1 ", 1"') is arranged. Printing cylinder (30, 30 ', 30 ", 30"') according to one of claims 10 to 12, characterized in that the strip (14, 14 ') as insertion aid (7) fixed to the blanket (1, 1', 1 ", 1"') or that the strip (9) as by the blanket (1, 1', 1 ", 1"') separate bar is executed. Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that at least one spring element (8) adjacent to one of the end sections (10, 10 ', 20, 20', 20 ", 20 '') in the channel (34, 34 ', 34 ", 34"') is arranged or a wall (22) of the channel (34, 34 ', 34 ", 34"') is resilient. Printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims, characterized in that the channel (34, 34 ', 34 ", 34"') at an angle (α) with respect to a radial plane (R ) of the impression cylinder (30, 30 ', 30 ", 30"') which intersects the circumference thereof together with a median plane (M) of the channel (34, 34 ', 34 ", 34"'). Web offset printing machine with a printing cylinder (30, 30 ', 30 ", 30"') according to one of the preceding claims.

Images