JP3348787B2 - Blanket cylinder sleeves, especially for web-based web offset presses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber sleeve according to the first aspect of the present invention. A similar device is known from DE 196 28 555.

[0002]

2. Description of the Related Art Sleeves of this type are known, for example, from U.S. Pat. Nos. 5,429,048, 5,323,702,
It is known from the specifications of 5,440,981 and 5,304,267. A disadvantage of these known blanket cylinder sleeves (transfer cylinder sleeves) is that at least some of the intermediate and lower layers of these sleeves must be continuous. This is particularly disadvantageous in terms of manufacturing costs.

According to US Pat. No. 5,351,615,
Furthermore, it is known to mount a rubber blanket on a support plate, for example by gluing. After installation, the device is formed on a blanket sleeve, and the opposite ends of the support plate and the rubber blanket or rubber coating are connected, for example, by welding or gluing. Such an arrangement does not create any gaps, but leaves binding seams or abutment sites on the surface.

[0004]

The object of the present invention is to compare the blanket cylinder sleeve described in the general concept section, in particular the blanket cylinder sleeve for web-type web offset printing presses, with known sleeves of this type. The goal is to produce less expensively while retaining substantially the same or even improved print quality and behavior.

[0005]

This object is achieved by means having the features specified in the independent claims. Advantageous further configurations of the invention are evident from the dependent claims and the description with drawings. This drawing shows a partial cross-section of a special embodiment of a blanket cylinder sleeve (transfer cylinder sleeve) according to the invention on a blanket cylinder particularly suitable for web offset web offset printing presses.

As is known from the prior art, for example, as described above, the basic part of a blanket cylinder sleeve of this type consists of a sleeve which is arranged inside and is preferably made of metal. However, instead of the inner metal sleeve, for example, a glass fiber reinforced sleeve (GFK) can also advantageously be used. These sleeves are designed to have a thickness that allows them to be slightly expanded by air when they are pressed onto a transfer cylinder, commonly called a blanket cylinder, in a printing press operated by an indirect printing method. As shown in particular in US Pat. No. 5,429,048, this type of sleeve is advantageous because it can be pushed through the side wall of the printing press onto a transfer cylinder that is open on one side. In this case, too, the press-fit sleeve is expanded by means of pressurized air using an opening provided in the transfer cylinder, so that the sleeve can be easily mounted.

On this inner, preferably metallic, support sleeve, there is provided, directly or indirectly, at least one further layer which is shrinkable, in other words air-encapsulated. ing. On this layer there is provided at least one cover layer, which can be formed, for example, from an elastomeric material. With this material layer,
From a plate cylinder or printing plate, for example an offset printing plate or a sleeve-shaped offset printing plate, the image to be printed is received and transferred onto a substrate.

[0008] Advantageously, between the shrinkable layer (compressible layer, for example an air-filled elastomer) and the cover layer, a further, non-stretchable layer, for example a hard elastomeric material or It is provided in the form of a short fiber material (for example, a thread).
This short fiber material can be embedded in a hard elastomer material. As an alternative, a non-stretchable layer or non-stretchable granules of thread or thread strips can be placed directly in said shrinkable layer.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. FIG. 1 of the accompanying drawings is a partial cross-sectional view of one transfer cylinder and one plate cylinder.

In the accompanying partial figures, the transfer cylinder (rubber blanket cylinder) is designated by the reference numeral 1 and the openings or nozzles provided on its surface are designated by the reference numeral 1a. Transfer cylinder sleeve (rubber blanket sleeve) provided in the above format
Has, as previously mentioned, a metal sleeve 3 which is advantageously expandable by air, on which a shrinkable layer 4 is vulcanized or glued. Provided on the shrinkable layer 4 is a layer of a non-stretchable material 5, preferably a hard elastomer layer containing short fibers, not shown in detail. A cover layer 6 is provided on the non-stretchable layer 5 and is made of, for example, an elastic material pressed in an offset printing process.

According to the present invention, as the support sleeve 3,
Advantageously, a metal sleeve, for example made of steel, is used, which is expandable by air and has an abutment 7. This butt 7 is, for example, a welding seam, which is formed by a metal sleeve being made of a metal plate, the ends of which are brought together and welded to form a butt 7. I have.

The support sleeve 3 can also be constructed without butt and without gap, in which case the butt 7 shown is eliminated. In such a configuration using a metal, a manufacturing method using an electroplating method is desirable. The non-metallic support sleeve 3 can also be advantageously manufactured without butting and without gaps.

Having an abutting part means that, in particular, the sleeve-like or cylindrical rubber layer or the synthetic material layer or the sleeve-like or cylindrical metal or non-metallic support is not endless in the circumferential direction, ie This means that there is no seam or discontinuity, or in other words, there is a seam or abutting point in the longitudinal or axial direction. The abutment site can have the layers abutted against one another there. The abutment can also be a gap between the two ends of one layer, which is advantageously closed by an adhesive or a vulcanizable material.

The shrinkable layer 4 also has a butting portion 8, which is manufactured as follows. That is, a compressible layer 4 in the form of a rubber blanket is adhered onto the metal sleeve 3, so that the abutting portion 8 is formed by both ends of the rubber layer 4.

In the present invention, even when the non-stretchable layer 5 is used on the shrinkable layer 4, the non-stretchable layer may still have the abutting portion 9, and the abutting portion 9 Can be formed in the manner described above.

According to a further embodiment, a laminated structure of this type, that is to say at least one flexible element having a butting portion 7 and preferably having a supporting sleeve 3 made of metal and a butting portion 8 provided thereon. A cover layer 6 having no abutting portion is provided on the shrinkable layer 4.

It is also possible for the cover layer 6 to have encapsulated air as well as the shrinkable layer 4, so that the cover layer 6 also has a certain degree of shrinkage. Such an arrangement is advantageous over the prior art and results in better printing results or printing behavior and better guiding of the web paper.

The sleeve according to the invention can also be produced particularly advantageously in the following forms: That is, a welded metal sleeve 3 made of steel or aluminum having one butt portion, or a GFK sleeve, for example, is used, and a conventional offset rubber blanket having, for example, one shrinkable layer is bonded or vulcanized on the weld metal sleeve. I do. Thereafter, the cover layer of the conventional rubber blanket is removed, for example, by grinding, and a continuous, in other words, seamless, cover layer 6 is bonded in place, for example, by vulcanization. In contrast to the known sleeves, such a production method and such a sleeve construction are significantly more cost-effective and have many advantages. In this case, the butting portions 8 and 9 are located above and below each other. Because these abutments are the ends of a conventional rubber blanket glued onto the support sleeve 3.

The abutments 8, 9 are not essential, but can advantageously be arranged directly above the abutment 7.

When arranging the individual layers which are not endless, ie one at least shrinkable layer 4 and the cover layer 6, and possibly still another, non-stretchable layer, in the embodiment designated 5, the individual layers It is also possible to arrange the abutting portions 7, 8, 9 so as to be located at different positions when viewed in the circumferential direction, that is, to prevent the abutting portions from being vertically arranged as shown in the figure.

In layer 5, an advantageous arrangement of short, non-stretchable, for example, thread-like strips is shown.

The sleeve 2 according to the present invention is not limited to use in web offset web offset presses, but can be used in many applications. Thus, these sleeves 2 can also be used, for example, for other, indirect printing methods, such as for example indirect intaglio printing, or as rollers.

The sleeve 2 is advantageously provided in correct registration. This is done, for example, by the sleeve 2 being pressed in at a certain circumferential position.

For example, it is possible to provide a mark at one end of the sleeve and one end of the transfer cylinder so that correct registration can be made when the mark matches. Sleeve 2
Are fitted on the transfer cylinder 1 so that the clamping grooves 14 of the plate cylinder 15 face the abutting portions 7, 8, 9 or gaps in the rolling range as shown in the drawing.

In the case of the above-mentioned registration, the cover layer 8 may have an abutting portion or a gap as indicated by reference numeral 16. If the gap 16 or the gaps of the abutments are relatively large, they can be closed by any suitable means, for example with an adhesive or a vulcanizable material.

The appropriate fixed fit of the sleeve 2, for example the metal layer 3, on the transfer cylinder 1 ensures that the sleeve 2 remains fixed in the register position during operation.

As a modification, for example, when assembling the sleeve 2, the strip 3 a is pushed into one slit 17 extending in the axial direction of the transfer cylinder 1 and fixed to the inner wall of the metal sleeve 3. Thus, it is also possible to lock the register position in shape.

In FIG. 1, all layers 3 to 6 have one abutment or gap 7, 8, 9, 16.
However, if there are few or only one layer, for example if it is the cover layer 6, then only one abutment or gap 16 is required. In this case, the butting portions 7 to 9 are omitted. If there is one abutment 16 or gap in the outer cover layer 6, the blanket cylinder sleeve 2 is placed on the transfer cylinder 1, and the abutment or gap 16 is also clamped in the rolling range with the plate cylinder 15. Opposed to groove 14, it is mounted in perfect registration.

The gist of one particular embodiment of the invention consists in merely making the outer layer 6, ie the layer receiving the printed image, elastic, that is to say, advantageously, its lower area or lower part. Only with an air fill, for example, or possibly with a downwardly open air passage. The layer thus formed can be placed directly on the support sleeve. A non-stretchable material, such as a thread or thread strip, can also be arranged in the layer.

The layer 3 is made of fiber-reinforced hard rubber.
It is also possible to produce with or without seams or gaps. If this layer is configured to be extendable, for example, by pressurized air, and a shrinkable layer, then a semi-shrinkable layer (fiber reinforcement is also possible), and a pressing cover layer are arranged on this layer. It is very advantageous.

[Brief description of the drawings]

FIG. 1 is a partial cross-section of an embodiment of a blanket cylinder sleeve (transfer cylinder sleeve) according to the invention, which can be used particularly advantageously in a web-type web offset printing press, and which is arranged on a blanket cylinder.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 blanket cylinder (transfer cylinder) 2 blanket cylinder sleeve 3 layer 3a strip material 4,5,6 layer 7,8,9 butted portion 14 clamp groove 15 plate cylinder 17 slit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Paul Steidre, Germany D-86845, Gross Eitingen Inkerweg, 1a (56) References JP-A-6-48063 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B41F 13/10 B41N 10/04

Claims (14)

(57) [Claims] 1. An air-expandable inner support sleeve (layer) (3) and a non-stretchable and / or non-stretchable layer (5) disposed thereon. A rubber cylinder sleeve (transfer cylinder sleeve), particularly for an offset printing press, having a shrinkable layer (4) and an outer cover layer (6). , 6) have at least one abutting portion (7, 8, 9, 16) or gap, and the cover layer (6) has the abutting portion (16).
Alternatively, if there is a gap, the blanket cylinder sleeve (2) can be correctly registered and mounted on the transfer cylinder (1), that is, the transfer cylinder (1) comes into rolling contact with the plate cylinder (15). In this case, it is possible to attach the abutting portion (16) or the gap in the cover layer (6) so as to be opposed to the clamp groove (14) of the plate cylinder (15). Rubber trunk sleeve. 2. The rubber according to claim 1, wherein the blanket cylinder sleeve and the transfer cylinder have auxiliary means for registering. Torso sleeve. 3. A further non-stretchable layer (5) or non-stretchable layer between the shrinkable layer (4) and the cover layer (6) or within the shrinkable layer (4). 3. A blanket cylinder sleeve according to claim 1, wherein a stretchable fabric or thread or fabric strip or thread strip is provided, which has an abutment (9) or a gap. . 4. The blanket cylinder sleeve according to claim 1, wherein air is enclosed in the shrinkable layer. 5. The blanket cylinder sleeve according to claim 1, wherein the cover layer (6) is contractible and air is enclosed therein. 6. The blanket cylinder sleeve according to claim 5, wherein the shrinkability of the cover layer (6) is smaller than the shrinkability of the shrinkable layer (4). 7. An offset rubber blanket is glued on said inner metal support sleeve (3), and the outer layer of said offset-rubber blanket is provided with an abutting portion. The blanket cylinder sleeve according to any one of claims 6 to 13. 8. The abutment of the metal support sleeve (3) has a weld seam (7) and the abutment (8, 9, 16) of the layer (4, 5, 6) above it.
Is formed by the butted ends of layers (4, 5, 6) glued or vulcanized on the support sleeve (3). The blanket cylinder sleeve according to the paragraph. 9. The blanket cylinder sleeve according to claim 8, wherein the abutting portions (8, 9, 16) are bonding portions. 10. An expandable inner support sleeve (3).
An outer layer (6) is disposed on top, said outer layer being filled with air or being provided with an open air passage towards the lower side, said outer layer further comprising an abutment or gap. Blanket cylinders, especially for offset printing presses
In the sleeve (transfer cylinder sleeve) (2), the blanket cylinder sleeve (2) is correctly registered on the transfer cylinder (1).
It can be installed together, that is, the transfer cylinder (1)
The outer layer, when in rolling contact with the plate cylinder (15),
(6) the abutting portion (16) or gap in
Is disposed opposite to the clamping groove (14) of the plate cylinder (15).
A blanket cylinder sleeve that can be attached so as to be attached . 11. The blanket cylinder sleeve according to claim 10, wherein a non-stretchable material is arranged in the outer layer (6). 12. The blanket cylinder sleeve according to claim 11, wherein the non-stretchable material is a thread or a thread strip. 13. The blanket cylinder sleeve according to claim 1, wherein the inner support sleeve (3) is a fiber-reinforced hard rubber layer. 14. The blanket cylinder sleeve according to claim 1, wherein the support sleeve (3) is a seamless sleeve.