EP1990191A2 - Web-fed printing press - Google Patents

Abstract

The press has a printing element preferably exhibits a form cylinder, transfer cylinder, an inking unit and a dampening unit. A transfer system (11) is assigned to a transfer cylinder (10) and a printing form system is assigned to the form cylinder. The transfer system is assigned to the transfer cylinder or each printing element is designed multipart in axial direction of the transfer cylinder. The transfer system includes rubber sleeves and form sleeves, which are positioned next to each other in axial direction of the respective cylinder. An independent claim is also included for a method for manufacturing of a rubber sleeves with a continuous carrier sleeve.

Description

The invention relates to a web-fed printing machine, in particular an illustrations-printing machine, according to the preamble of claim 1 or 10.

A printing unit of an offset web press, in addition to a forme cylinder, an inking unit and optionally a dampening unit further comprises a transfer cylinder, with the aid of the transfer cylinder ink can be transferred to a printing material to be printed. The transmission cylinder is assigned a transmission system. The form cylinder is assigned a printing plate system.

In transmission systems, a distinction is made between blanket systems, rubber blanket systems and rubber sleeve systems. Blankets and blankets, also known as metal back blankets, are stretched on the transfer cylinder in chutes. Rubber sleeves are pushed onto the transfer cylinder in the axial direction and do not require any chan- nel channels. For rapport-free printing in exciting channels to rubber blankets or blanket plates are not suitable, but this rubber sleeves must be used, namely those that are seamless on their surface.

In the case of printing form systems, a distinction is made between printing plate systems and form-sleeve systems. Printing plates are clamped on the form cylinder in clamping channels. Formsleeves, however, are pushed in the axial direction of the form cylinder and do not require clamping channels.

In particular, in offset-illustration printing presses hitherto transfer systems and printing-plate systems have been used which are adapted to the axial width of the transfer cylinder or forme cylinder and extend uninterruptedly over the entire utilized axial width of the transfer cylinder or forme cylinder. With increasing axial width of the transfer cylinder or of the forme cylinder, the production costs of such transfer systems and printing form systems increase.

Furthermore, with increasingly larger axial widths of the transmission systems and printing plate systems, a constant print quality over the entire width of the printing technology used as good as can no longer be guaranteed. Furthermore, due to the increasing dimensions as well as the increasing weight of such transmission systems as well as printing form systems, the handling of the same difficulties is occurring.

On this basis, the present invention has the object to provide a novel web printing press.

This object is achieved according to a first aspect of the invention by a web-fed printing machine according to claim 1. After that, the transmission cylinder of the or each printing unit associated transmission system is formed in several parts in the axial direction of the transfer cylinder.

This object is achieved according to a second aspect of the invention by a web-fed printing press according to claim 11. Thereafter, the form cylinder of the or each printing unit associated printing form system is formed in several parts in the axial direction of the forme cylinder.

The first aspect of the invention as well as the second aspect of the invention may be used either alone or in combination with each other on a web-fed printing machine.

Preferably, the transmission system according to the first aspect of the invention comprises a plurality of rubber sleeves and the pressure molding system according to the second aspect of the present invention comprises a plurality of molding sleeves each positioned adjacent to each other in the axial direction of the respective cylinder. This allows the economical use of sleeving technology in transfer cylinders and form cylinders with a large axial width.

Fig. 1:

einen Querschnitt durch, einen Übertragungszylinder einer erfindungsgemäßen Rollendruckmaschine zusammen mit einem auf dem Übertragungszylinder positionierten Übertragungssystem;

Fig. 2:

den Übertragungszylinder der Fig. 1 beim Aufschieben eines ersten Teils des Übertragungssystems

Fig. 3:

ein Übertragungssystem, bestehend aus einem durchgehenden Trägersleeve mit zwei Gummiaufzügen

Fig. 4:

eine schematisch dargestellte Vorrichtung zum Fertigbearbeiten von Gummisleeves.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

Fig. 1:

a cross section through, a transfer cylinder of a web-fed printing press according to the invention together with a transmission system positioned on the transfer cylinder;

Fig. 2:

the transfer cylinder of Fig. 1 when postponing a first part of the transmission system

3:

a transmission system, consisting of a continuous carrier sleeve with two rubber lifts

4:

a schematically illustrated device for finishing rubber sleeves.

Fig. 1 and 2 show a transfer cylinder 10 of a printing unit of a web-fed printing press according to the invention, in particular an illustration printing press, wherein the transfer cylinder 10 is assigned a transmission system 11 is soft on an outer surface 12 of the transfer cylinder 10 is arranged or pushed onto this outer surface 12.

In the illustrated embodiment of the Fig. 1 and 2 the transmission system 11 comprises two rubber sleeves 13, 14 arranged side by side in the axial direction of the transfer cylinder 10.

Fig. 1 shows the transfer cylinder 10 in a state in which both rubber sleeves 13, 14 are pushed onto the outer surface 12 thereof. Fig. 2 shows, however, the transfer cylinder 10 exclusively together with the rubber sleeve 14th

This in Fig. 1 Transmission system 11 shown is divided so that a joint 15 between the directly juxtaposed rubber sleeves 13, 14 in the middle of the printing-used width L of the transfer cylinder 10 and the transmission system 11 is located. Each rubber sleeve 13, 14 therefore has a printing width of% L.

The joint 15 between the two rubber sleeves 13, 14, which are positioned next to each other on the transfer cylinder 10 in the axial direction, is located at a non-printing location or a non-printing axial position of the transfer cylinder 10, in particular at an axial position of a longitudinal fold to be formed on the printed substrate and / or longitudinal section.

Although in Fig. 1 and 2 the transmission system 11 is made in two parts, it should be noted that the same in the axial direction of the transfer cylinder can be formed more than two parts.

In order to allow mounting and dismounting of the rubber sleeves 13, 14 of the transmission system 11 to or from the transfer cylinder 10, an independent compressed air system 16 or 17 is integrated into the transfer cylinder 10 for each rubber sleeve 13, 14 ,

The compressed air system 16 has air openings 18 and the compressed air system 17 via air openings 19, which respectively open on the outer surface 12 of the transfer cylinder 10. An air pressure p can be provided to the compressed air system 16 in order to build up an air cushion when mounting or dismounting or removing the rubber sleeves 13, 14 between the surface 12 of the transfer cycle 10 and the respective rubber sleeve 13, 14.

The opening on the surface of the transfer cylinder 10 air holes 18, 19 of the compressed air systems 16, 17 are spaced apart such that the axial distance between the air holes 18, 19 of the two compressed air systems 16, 17 is either smaller or equal to the axial extent of the Rubber sleeves 13, 14. This may work best Fig. 2 taken from the rubber sleeve 14 when mounting or dismounting the same on the transfer cylinder 10.

So shows Fig. 2 in that the rubber sleeve 14 covers both the air bores 18 of the compressed air system 16 and the air bores 19 of the compressed air system 17 in the position shown. This ensures that when mounting or mounting and dismounting or removing the air cushion between the rubber sleeve 14 and the outer surface 12 of the transfer cylinder 10 does not depart.

The air holes 18, 19 have in the assembled state of the two rubber sleeves 13, 14 from a seen in the lift direction rear edge of the rubber sleeves 13, 14 a defined distance A and B on.

At one axial end, the forme cylinder 10 has a portion 20 which protrudes relative to the outer surface 12 and thus forms a stop for the front rubber sleeve 14 seen in the lift direction.

With reference to Fig. 1 and 2 the invention has been described for the preferred application in which the transfer cylinder associated transmission system comprises a plurality of rubber sleeves. In contrast, it is also possible that seen in the axial direction of the transfer cylinder on the same side by side several blankets or more blanket plates are positioned.

Furthermore, it is - as in Fig. 3 also possible to provide a continuous carrier sleeve 30 (eg made of nickel) and to apply thereto two or more rubber hoists 31 side by side, which form the overall width of the transmission system. Preferably, the joints between two rubber elevators 31 are closed by seals 32. In this way, it is advantageous simply possible to produce rubber tires with narrow width a wider overall sleeve.

The inventive concept is not limited to transfer cylinders and transmission systems, but the invention can also be used in Formzytindern and printing plate systems. The above explanations apply analogously to pressure-forming systems designed in several parts in the axial direction of a forme cylinder, in which case the pressure-forming systems preferably comprise a plurality of shaping sleeves positioned next to one another in the axial direction.

It is also possible printing plate systems with a plurality of axially juxtaposed printing plates. The use of such partially wide printing plates has the advantage that the production costs can be kept low. Farther a risk of breakage of the printing plates is reduced. Furthermore, the bending geometry of the printing plates can be realized with reasonable effort within required tolerances. The form cylinder is preferably associated with a continuous clamping channel without offset for receiving the multi-part printing form system. Each of the part-width printing plates preferably has a mechanical register system which is accommodated in the forme cylinder. The clamping channel accommodates a clamping or clamping system for the printing plates.

With regard to the transmission systems with two or more rubber sleeves 13, 14 (FIG. Fig. 1 ) or a rubber sleeve with a continuous carrier sleeve 30 ( Fig. 3 ) are arranged side by side on the two or more rubber hoists 31, it is particularly advantageous if the various rubber sleeves 13, 14 and rubber hoists 31 have identical outer diameter and concentricity properties.

In a separate production of several rubber sleeves, the deviation of the outer diameter is up to 0.04 millimeters. This can lead to different conveying behavior and wrinkling on the paper web when several such rubber sleeves are used together on a transfer cylinder of an offset printing press, in particular at the joints of two rubber sleeves. Especially with large web tension, as is usually the case with commercial printing presses, such wrinkles can also lead to web breaks. Web breaks can damage the press and in any case lead to downtime.

To avoid this, the rubber sleeves 13, 14 ( Fig. 1 ) or the rubber lifts 31 ( Fig. 3 ), which are to be used together on a transfer cylinder, finished together according to the inventive method in one step. This is based on the schematic Fig. 4 explained below by way of example.

In the finishing of rubber sleeves, the outer rubber layer is usually ground to achieve a predetermined surface roughness and a given dimension for the diameter.
According to the method of the invention, the (two or more) rubber sleeves 13, 14 to be used together are received together on a so-called master cylinder 40 and ground together by a grinding device 50 to the predetermined diameter and finished therewith.
Corresponding devices for finishing rubber sleeve or rubber sleeves are well known. The master cylinder 40 is preferably rotatably mounted on both sides, wherein at least one storage for the assembly or disassembly of sleeves can be removed. The master cylinder 40 is preferably provided with an air system that can create an air cushion under a sleeve. The grinding device 50 is vorzusweise from a rotating grinding wheel 50, which is on the surface of the mother cylinder 40 on and off. For finishing, the grinding device 50 moves under the action of the surface of the rubber sleeves 13, 14 in the axial direction (arrow A) over the entire length of the mounted rubber sleeves 13,14, possibly also in addition with an overflow. The grinding operation is preferably carried out in synchronism, ie, the rotation of the nut cylinder 40 and the direction of rotation of the grinding wheel 50 run at the contact point in the same direction. Of course, a reverse grinding would be possible. Likewise, it is also conceivable, instead of the grinding device 50, to move the master cylinder 40 past the grinding device 50 in the axial direction.

Through the joint finishing, the two or more rubber sleeves have an identical outer diameter and an identical surface roughness so that a homogeneous web tension is ensured and wrinkling of the paper web is avoided.

In order that these advantages according to the invention can be optimally utilized, the rubber sleeves 13, 14, which have been finished together, must be marked accordingly are used and together on a transfer cylinder of a printing press. For this purpose, the already existing on the metallic inner sleeve marking, preferably supplemented by a corresponding reference to a pairwise production or more sleeves.
Since during finishing, despite the greatest care over the processing length slight differences in diameter (within the tolerance limits) may occur, it is particularly advantageous if the rubber sleeves are applied in exactly the mounting position on the transfer cylinder, which they had also taken during the finishing. That is, the rubber sleeves are preferably mounted with the same end sides as in the finishing machining against each other on a transfer or blanket cylinder. At the rubber sleeves 13, 14 corresponding labels are provided. For this example, small grooves 42, 43 are arranged in non-printing area of the sleeves.

In order to additionally ensure the advantage of a common concentricity, the rubber sleeves are preferably aligned with respect to their circumferential position so on the transfer cylinder / blanket cylinder to each other that it corresponds to the circumferential position on the master cylinder during finishing. In order for such circumferential registering of the shared rubber sleeves 13, 14 to be possible, markings are preferably applied to the rubber sleeves 13, 14 and the master cylinder 40 as well as the blanket cylinders of the printing press.
Such markings may for example be designed as dashes 41, 44 on the master cylinder and rubber or transfer cylinder or as small grooves, comparable to those on the rubber sleeves.

To identify the Gummisleeves 13, 14, it is also possible to attach to the surface markings with water-soluble colors that are washed off quickly when pressed. Such markings could, after completion of finishing in the form of lines in the circumferential position of the cylinder marks 41, 44 and at each transition from one to a be further sleeve before the sleeves are removed from the master cylinder 40. If the rubber sleeves are removed from a transfer cylinder of a printing press for later reassembly, the markings would have to be reapplied prior to disassembly. As a water-soluble marking, for example, a chalk screed is conceivable.

Claims (25)

Web-fed printing press, in particular commercial printing machine, with at least one printing unit, wherein the or each printing unit has a forme cylinder, a transfer cylinder, an inking unit and preferably a dampening unit, and wherein the transfer cylinder, a transmission system and the forme cylinder is associated with a printing form system, characterized in that the transfer cylinder (10) of the or each printing unit associated transmission system (11) is formed in several parts in the axial direction of the transfer cylinder. Web-fed printing machine according to claim 1, characterized in that joints (15) of immediately adjacent parts of the transfer system (11) are positioned at a non-printing axial position, in particular at the axial position of a longitudinal fold and / or a longitudinal section. Web-fed printing machine according to claim 1 or 2, characterized in that the transmission cylinder (10) of the or each printing unit associated transmission system (11) is formed in two parts in the axial direction of the transfer cylinder. Web-fed printing machine according to one of claims 1 to 3, characterized in that the transmission system comprises a plurality of axially positioned on the transfer cylinder blanket plates. Web-fed printing machine according to one of claims 1 to 3, characterized in that the transmission system has a plurality of axially positioned on the transfer cylinder blankets. Web-fed printing press according to one of claims 1 to 3, characterized in that the transmission system (10) has a plurality of rubber sleeves (13, 14) positioned on the transfer cylinder in the axial direction. Web-fed printing machine according to claim 6, characterized in that the transfer cylinder (10) for each rubber sleeve (13, 14) has an independent compressed air system (16, 17) for mounting or dismounting the respective rubber sleeve (13, 14) on the transfer cylinder , Web-fed printing machine according to claim 7, characterized in that at the surface of the transfer cylinder (10) opening air holes (18, 19) of the compressed air systems (16, 17) are spaced apart such that the axial distance of the air holes (18,19) is smaller than or the same size as the axial extent of the rubber sleeves. Web-fed printing machine according to claim 1 or 2, characterized in that the transmission system consists of a continuous carrier sleeve (30) on which at least two rubber hoists (31) are applied side by side. Web-fed printing press according to one or more of Claims 1 to 9, characterized by features according to one or more of Claims 11 to 17. Web-fed printing press, in particular an illustrated printing press, with at least one printing unit, wherein the or each printing unit has a forme cylinder, a transfer cylinder, an inking unit and preferably a dampening unit wherein the transfer cylinder, a transfer system and the forme cylinder is associated with a printing form system, characterized in that the form cylinder of the or each printing unit associated printing form system is formed in several parts in the axial direction of the forme cylinder. Web-fed printing press according to claim 11, characterized in that joints of immediately adjacent parts of the printing form system are positioned at a non-printing axial position, in particular at the axial position of a longitudinal fold and / or a longitudinal section. Web-fed printing machine according to claim 11 or 12, characterized in that the form cylinder of the or each printing unit associated printing form system is formed in two parts in the axial direction of the printing form system. Web-fed printing machine according to one or more of claims 11 to 13, characterized in that the printing form system has a plurality of axially positioned on the form cylinder Formsleeves. Web-fed printing press according to claim 14, characterized in that the form cylinder for each Formsleeve has a compressed air system in order to assemble or disassemble the respective Formsleeve on the forme cylinder. Web-fed printing machine according to claim 15, characterized in that on the surface of the forme cylinder opening air holes of the compressed air systems are spaced from each other such that the axial distance of the air holes smaller than or equal to the axial extent of the Formsleeves. Web-fed printing press according to one or more of Claims 11 to 13, characterized in that the printing-form system has a plurality of printing plates positioned on the forme cylinder in the axial direction. Web-fed printing press according to one or more of Claims 11 to 17, characterized by features according to one or more of Claims 1 to 9. Method for the production of rubber sleeves for common use on a transfer cylinder of a printing press, characterized in that the at least two rubber sleeves are received together on a holding device and are finished together in terms of their outer diameter. Method for producing a rubber sleeve with a continuous carrier sleeve (30) on which at least two rubber hoists (31) are applied next to one another, characterized in that the rubber hoists (31) are applied to the carrier sleeve (30) prior to finishing and finish together with respect to their outside diameter to be edited. A method according to claim 19 or 20, characterized in that the one or more rubber sleeves (13, 14, 30) are received on a master cylinder and ground by a grinder to a predetermined degree. Method according to one of the preceding claims 19 or 21, characterized in that the rubber sleeves are (13, 14) machined as done in common. Method according to one of the preceding claims 19, 21 or 22, characterized in that the rubber sleeves are characterized by an indication of the metallic inner sleeve for common use. Method according to one of the preceding claims 19, 21, 22 or 23, characterized in that the rubber sleeves are marked on the fixture with respect to their circumferential position and corresponding marks are provided on the transfer cylinder. Method according to one of the preceding claims 19, 21, 22, 23 or 24, characterized in that the rubber sleeves for marking their circumferential position with a groove (42, 43) or with water-soluble color are identified.

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