EP2042314A1 - Cylinder for a printing unit for variable paper web widths - Google Patents

Abstract

The cylinder (1) has three channels (2a, 2b) for fastening a covering, where one of the channels is provided in middle regions (C, D) of the cylinder. The other channels displaced towards the former channel in a circumferential direction are provided in lateral regions (A, B, E, F) of the cylinder, so that the channels overlap in a partial region in an axial direction, where the latter channels are not connected with each other. The latter channels are axially spaced from each other, and the former channel is displaced in the circumferential direction.

Description

The invention relates to a cylinder for a printing unit, in particular for an offset rotary printing machine for variable paper web widths and in particular a blanket or transfer cylinder, and a forme cylinder,

In a printing unit of a rotary printing press, in particular an offset rotary printing press cylinder in the form of forme cylinders and transfer cylinders or Gumnituchzylindern are provided, which in the circumferential direction with, for example, one, two or more linings or lifts and in the axial direction, that is, the width or the length of the respective Cylinders, with one or more lifts. The elevators are formed in a form cylinder, for example, as a plate-shaped printing plates. The elevators of a Übettragulagszylinders are preferably rubber blankets, which may be applied to a support plate and form a metal blanket.

The printing unit can be designed, for example, as a 9-cylinder satellite printing unit, in which 4 pairs each consisting of a forme cylinder and a transfer cylinder in a frame are preferably arranged in pairs diametrically in preferably gleichmäβiger distribution around a common impression cylinder.

To a low-vibration printing as possible, especially in 4-page wide printing presses with large newspaper format or 8-page wide printing presses ensure that it is advantageous to arrange the channels of the blanket or transfer cylinder offset from one another, so there are channel-free areas viewed across the width of the transfer or blanket cylinder.

If, for example, 6-page wide printing presses are used, variable paper widths may cause a problem with the blanket plate assembly. In principle, a single blanket plate per cylinder could be used, but due to the size of this blanket plate leads to poor handling. If two separate blanket plates are used, there is a parting line between the two blanket plates used, so that no panorama can be printed in the middle area, which has this parting line. When using three blanket plates, printing can only be carried out correctly if the paper web has been cut and spread beforehand. However, this leads to problems with the ink register in the case of rubber / rubber machines.

The WO2004 / 002739 A1 and the corresponding one EP 1 515 848 B1 disclose a pair of cylinders of a printing unit of an offset rotary printing press, consisting of a forme cylinder and a transfer cylinder, wherein the forme cylinder and the transfer cylinder in each case in openings extending below their lateral surface in the axial direction opening openings for inserting the ends of elevators, wherein for each printing plate at least one opening in the At least one opening of the forme cylinder rolls on at least one opening of the transfer cylinder, wherein the transfer cylinder is juxtaposed in its axial direction with at least three rubber blankets and along its circumference with a rubber blanket, wherein the form cylinder in its axial direction next to each other with the same to the transfer cylinder or a larger number of printing plates and along its circumference with two printing plates n is occupied, wherein the width of a printing form corresponds to the width of a rubber blanket or the widths of several printing forms complement the width of a rubber blanket. The axially extending width of each opening made in the forme cylinder and the transfer cylinder corresponds to the width of one of the elevators, respectively. The openings of adjacent in the axial direction of the transfer cylinder, by the width the rubber blankets defined sections are arranged offset in the circumferential direction by 90 and axially spaced openings are closed by closed portions of the lateral surface with each other. The openings of adjacent portions in the axial direction of the forme cylinder are arranged offset in the circumferential direction by 90 and by closed portions of the lateral surface axially spaced openings are aligned.

From the WO01 / 39977 A1 and the corresponding ones EP 1 2.33 864 A0 . EP 1 310 363 A1 and EP 1 361 052 A2 a printing unit of a rotary printing press with a transfer cylinder and a forme cylinder is known, wherein the transfer cylinder has a channel for receiving one or more blankets and the forme cylinder at least two circumferentially of the forme cylinder arranged successively channels for receiving one or more printing plates on the forme cylinder, wherein at least one the channels of the forme cylinder is at least partially covered by a printing plate and wherein the at least partially covered channel for receiving one or more printing forms in the region of a channel for receiving one or more blankets of the cooperating transfer cylinder rolls.

It is an object of the present invention to provide a cylinder especially for a rotary printing machine, which allows a variable arrangement of coverings, elevators or plates, such as blanket plates or printing plates,

This object is achieved by a cylinder according to claim 1. Advantageous embodiments result from the dependent claims,

A cylinder, which according to the invention may be formed as a blanket, transfer cylinder or as a form cylinder, has at least three channels, wherein at least two circumferentially offset from each other and preferably has in the axial direction of the cylinder extending channels for attaching a covering, such as a Blanket or metal blanket or to attach a plate-shaped printing forme. The at least three channels are formed so that one of these channels for hanging or clamping a support plate or a blanket in the central region of the cylinder, is used. The channel can either have the width used for a printing process or extend over the entire width or axial length of the cylinder. Alternatively, this channel can also be formed only in the middle region of the cylinder such that it has, for example, the same extent in the axial direction, starting from the axial half or a center of the cylinder. For example, in the case of a six-sided cylinder, this channel can be two sides wide and provided in the central region of the cylinder. The or in the circumferential direction and preferably also axially offset to the channel described above channels, which are used for hanging coverings, such as plates or rubber blankets, adjacent to the hinged in the above-described channel coverings, so plates or rubber blankets, preferably, have An axial extent, which is wider than the axial extent of, for example, only centrally provided above described first channel- Here, regions of the second channels in the axial direction and preferably offset in the circumferential direction with the first channel overlap. Thus, for example, in the axial direction spaced from one another in the axial direction and offset from each other across the width of the second channels printed forms, carrier plates or blankets are hung, clamped or fixed, which can be further offset or moved with respect to the center of the cylinder as in a channel which extends only across the width, which is needed for mounting a printing plate or support plate in normal operation.

Consider, for example, the embodiment of a six-sided cylinder in which the cylinder can be classified, for example, into six zones A to F, as in FIG FIG. 1 and FIG. 3 shown, on one side of the cylinder, a first channel approximately centrally in the axial direction of the cylinder over the width of the zones C, D is provided extending to which a printing plate or a rubber blanket can be attached or used, so that the printing forme or Rubber blanket 2 sides wide in the middle of the cylinder is provided. In order to be able to fasten a printing forme or support plate for a blanket at the laterally adjoining each 2 sides wide areas (zones A, B and E, F) are preferably in the circumferential direction, for example offset by 180 °, the two axially spaced preferably aligned second Channels are provided which extend in the axial direction so far toward the center, that an inner portion of the second channels axially overlaps with the respective outer region of the central first channel, wherein the inner regions of the second channels in a centrally applied Printing form or a rubber blanket at least partially under the middle printing form or Oummidrucktuch can run. The channels adjacent to the central channel extend, for example, completely over the width of the zones A, B or E, F and protrude into the zones C, D.

The roll according to the invention can thus also be used for variable and, in particular, smaller paper-pulp widths, ie e.g. smaller than the width of one of the zones A to F, are printed without restrictions, since for example the blanket plates or printing plates can be arranged so that, for example, three adjacent paths can be printed without spreading. When using three blankets on a cylinder known from the prior art can only be printed if the web was previously cut and spread, otherwise problems would result from the edges of the pads.

Since, according to the invention, the channel slots introduced into the cylinder are arranged overlapping, both narrow and wide coverings, e.g. Blankets or printing plates, to be mounted. The narrower the web to be printed, the further the inner sections of the second channels project into the central region of the cylinder.

If the width of the web to be printed changed, so the blanket plates and printing plates can be changed with relatively little effort and mounted on the cylinder so that the printed webs can be printed correctly even without spreading.

To prevent a natural frequency excitation in the printing cylinders, the angle or the angular offset or distance between the channels can be arbitrary and are preferably such that the channel beats are minimized. For continuous channels, the angles are preferably 180 °. For example, for approximately panaram-width (2-page width) channels, the angular offset is e.g. 5 to 20 ° to each other.

Preferably, the second channels are offset in the circumferential direction to the first channel. In this case, the second channels may be provided so that they are aligned and the same Angle are arranged offset relative to the first channel. Alternatively, it is also possible that the second channels are not aligned and are arranged offset by different angles of, for example, + 90 ° and -90 ° or 90 ° and 180 ° to the first channel.

Except for the above-exemplified embodiment of a cylinder for six-sided machines, the invention can also be used for wider rollers for printing on, for example, 8 pages, 10 pages, or even more pages. In this case, the channels are provided so that they extend at least beyond the boundary resulting from the sides to be printed on the lateral surface of the cylinder and at least partially protrude into the adjacent region of a side to be printed to flexible coverings, printing plates or rubber blankets be able to span, which can be introduced at different locations within the channel running in the axial direction, so as to be able to print so variable paper web widths preferably without a prior spread. In this case, adjacent channels in the axial direction are offset from each other in the circumferential direction and overlap axially at least in part. Individual channels can continue to move, e.g. extend over the entire cylinder width. At least one and preferably at least two channels do not extend over the full cylinder width.

The overlapping of the channels used to fasten the coverings, that is blankets or printing forms, is preferably such that, in principle, blankets or printing forms could be fastened which overlap one another in the axial direction of the cylinder. The axial overlap of the preferably circumferentially offset channels is for example between 0 and 100%, for example 5%, 10%, 12.5%, 15%, 20% or more of a paper web to be printed. For example, if the axial overlap or axial reach into a neighboring zone is 25%, such a cylinder can be used, for example, to print webs having a normal width, with blankets or printing forms being suspended in the zones normally provided for this purpose. But it can also be printed on webs, which have, for example, only 50% of the normal width, wherein in the region of the cylinder in which there is no overlap or no passage of channels from adjacent zones, for example, a rubber blanket with half the width is clamped (normal Width minus 2x25% of the overlapping or extending channels of the adjacent areas). A roll width narrowing for example, in a 6-page wide printing machine of 3 x 750 mm = 2250 mm to eg 3 x 600 mm = 1800 mm, as in FIG. 5 shown reduced in scale 1:10, is 25%. In this case, applies to the respective displacement e of the outer via the outer formers 5a and 5c guided tracks or for the displacement of the hinged pads inwards: $$\mathrm{e}\mathrm{=}\mathrm{0}\mathrm{.}\mathrm{5}\mathrm{\times }\left(\mathrm{coarser\; width}\left(\mathrm{750}\mathrm{mm}\right)\mathrm{-}\mathrm{smaller\; width}\left(\mathrm{600}\mathrm{mm}\right)\right)\mathrm{=}\mathrm{75}\mathrm{mm}$$

The inward displacement of the outer formers 5a and 5c is calculated as follows: $$\mathrm{f}\mathrm{=}\mathrm{0}\mathrm{.}\mathrm{5}\mathrm{\times }\left(\mathrm{larger\; width}\left(\mathrm{750}\mathrm{mm}\right)\mathrm{-}\mathrm{smaller\; width}\left(\mathrm{600}\mathrm{mm}\right)\right)\mathrm{+}\mathrm{e}\left(\mathrm{75}\mathrm{mm}\right)\mathrm{=}\mathrm{2}\mathrm{\times }\mathrm{e}\mathrm{=}\mathrm{150}\mathrm{mm}$$

The above formulas for e and f generally apply independently of the numerical values specifically used here by way of example only.

Directly adjacent to the rubber blanket in the axial direction, a rubber blanket can be stretched in each case due to the extending channels, so that printing on half the paper web widths at, for three adjacent tracks without previous spreading is possible. In this case, each intermediate region of the width between the normal width and 50% of the normal width can also be printed, since the rubber blanket clamped, for example, in a central region of the cylinder can be reduced in width until it reaches the channels extending into the zone borders, which for clamping of adjacent coverings, eg Rubber blankets can be used. The above explanations also apply to covering the cylinder with printing plates instead of rubber blankets.

Preferably, in at least one channel, such as a central channel of the cylinder, or in other channels, an adjustment or registration element, such as a register cam, is provided which serves to define a plate to be suspended with respect to the channel and preferably centered can be used.

Preferably, the width of a rubber blanket is sized to correspond to the width of two printing forms. The printing plates are preferably each the same width.

Preferably, the rubber blankets are each the same width. The rubber blankets can be provided on a carrier plate, for example a dimensionally stable metal carrier plate, or independently thereof.

In the channels described, holding devices known per se in the prior art may preferably be provided for holding angled regions or suspension legs of an elevator.

The invention further relates to the use of a cylinder as described above as a forme cylinder or as a transfer cylinder- In this case, the transfer cylinder can be arranged cooperatively with a counter-pressure cylinder.

Figur 1

eine Draufsicht auf einen Zylinder mit zwei fluchtenden voneinander beabstandeten ersten Kanälen;

Figur 2

die in Falztrichter einlaufenden mit dem in Figur 1 gezeigten Zylinder bedrucktten Papierbahnen kleinerer Breite;

Figur 3

die Rückseite des in Figur 1 gezeigten Zylinders mit einem mittig angeordneten ersten Kanal;

Figur 4

eine Querschnittsansicht des Zylinders im Bereich eines Kanals mit Registernocken; und

Figur 5

eine Prinzipskizze zur maßstabsgetreuen Veranschaulichung der Größenverhältnisse bei einer Rollenbreiten-Verschmälerung und Verschiebung der Falztrichter.

The invention will be described below with reference to preferred embodiments, in which:

FIG. 1

a plan view of a cylinder with two aligned spaced apart first channels;

FIG. 2

the incoming in formers with the in FIG. 1 shown cylinder printed paper webs of smaller width;

FIG. 3

the back of the in FIG. 1 shown cylinder with a centrally located first channel;

FIG. 4

a cross-sectional view of the cylinder in the region of a channel with register cam; and

FIG. 5

a schematic diagram for true-to-scale illustration of the size ratios in a roll width narrowing and displacement of the former.

FIG. 1 shows a cylinder 1 of a printing unit of a rotary machine, in particular an offset rotary printing machine, from a first side. The cylinder 1 can be designed as a forme cylinder or as a transfer cylinder and can be occupied in the circumferential direction, for example with an elevator and axially, that is, over its width, with, for example, three elevators.

In the formation of the cylinder 1 as a forme cylinder, the elevators are preferably formed as plate-shaped printing plates. If the cylinder is designed as a transfer cylinder, the elevators are preferably each rubber blankets applied to a carrier plate, wherein the elevators for the transfer cylinder are preferably formed as a metal blanket,

The printing unit can be designed, for example, as a 10-cylinder satellite printing unit, in which in each case 2 pairs each consisting of a forme cylinder and a transfer cylinder are arranged in a frame on each impression cylinder, wherein the forme cylinder and / or the transfer cylinder the features of this invention. The two impression cylinders preferably have a smooth closed metal surface without openings.

How out FIG. 1 can be seen, two axially extending aligned channels 2a and 2b are provided, in which the printing plates or support plate can be hung. The cylinder 1 has in the region of its end faces bearer rings 1a and 1b.

To the bearer rings 1a and 1b of the cylinder 1 then edge zones are provided in which there is no channel. The area of the cylinder 1 between the edge zones can be used to print a single paper web of width PBmax. If paper webs of smaller width are to be printed, then, for example, three paper webs of equal width 1 / 3PBmax adjacent to each other can be printed. When using the cylinder 1 as a transfer cylinder each Gnmmitücher or blanket carrier plates in the left and right shown in the second channels 2 a and 2 b are clamped so that the edges of the rubber blankets preferably along the in FIG. 1 dashed lines shown the boundaries of the individual zones A, B; C, D and E, F are lost,

FIG. 3 shows the in FIG. 1 shown rotated by 180 ° cylinder 1, wherein in the region of the central zone C, D extending in the axial direction of the first channel 3 is provided, which serves for suspending a rubber blanket in the region of the central zone.

Thus, according to a first configuration, 2-page-wide blankets can be laid up next to each other on the cylinder 1 in the axial direction in order to print on 3 paper webs of the same width 1 / 3PBmax.

If now paper webs of a smaller width to be printed side by side, as exemplified in FIG. 2 shown, the smaller width of 1 / 3PBmin to be clamped on the cylinder 1 can be applied as follows: For the printing of the middle paper web is centered in the in FIG. 3 shown first channel 3 mounted a blanket plate, which has the width 1 / 3PBmin. Adjacent thereto, blanket plates can be mounted axially displaced in the first channels 2a and 2b, which are offset by 180 ° in the exemplary embodiment, so that they protrude into the central zone C, D by the axial length d, as in FIG FIG. 1 shown, so that the three adjacent blanket plates allow the printing of three adjacent tracks without spreading. The suspended in the first channels 2a and 2b blanket plates may, for example, only the width 1 / 3PBmin or have a greater width up to the maximum possible width in the embodiment 1 / 3PBmax + d.

Clamps (not shown) are disposed in the channels 2a, 2b and 3 to provide a secure hold for the edges or pad ends introduced therein. Advantageously, the clamping elements are arranged so that sufficient clamping is ensured for all paper widths. This can be achieved for example by a larger number of adjacent clamping elements.

In the FIGS. 2 and 3 Folding funnels 5 are shown, via which the printed paper webs can be guided.

FIG. 4 shows a cross section of the cylinder 1 in the region of one of the channels 2a, 2b or 3. In this case, the channel can be milled directly, so that the cylinder 1 has no insert. Likewise, it is also possible that known clamping or holding devices in the region of the channel or channels 2, 3, in particular for slot arrangement in blanket plate or spindle voltage, are provided.

How out FIG. 4 can be seen, a register cam 4 is fixedly provided in the channel and preferably in the centrally located first channel 3 in order to center the einzuhängende center plate by means of the register cam or defined to fix.

If the change of a paper width is performed, not all blanket plates need to be changed. It is possible that only the blanket plate suspended in the first channel 3 is exchanged, the outer blanket plates placed in the two second channels 2a and 2b being pushed towards the middle blanket plates. Likewise, in the reverse process, so the change of a smaller to a larger width, only the middle blanket plate are exchanged, the outer blanket plates are pushed to the outside. The same applies to the hanging of printing plates.

FIG. 5 shows on a scale of 1:10 the size ratios of an example roll width narrowing of a 6-page wide printing press from 2,250 mm (3 x 750 mm) to 1800 mm (3 x 600 mm). The middle former 5b may remain in its middle position when the outer or side pads are displaced inwardly by e, the outer folders 5a and 5c being displaced inwardly by the path f, respectively;

Claims (12)

Cylinder for a printing machine having at least three channels for fixing a pad, wherein a first channel (3) is provided at least in a central region (C, D) of the cylinder (1) and at least two circumferentially offset from the first channel (3) second channels (2a, 2b) are provided in lateral areas (A, B, E, F) of the cylinder (1) such that the first channel (3) and the at least two second channels (2a, 2b) at least in one Partial region overlap in the axial direction, wherein the two second channels (2a, 2b) are not connected to each other. Cylinder for a printing machine having at least three channels (2, 3) for fixing a covering, wherein at least two channels (2) are axially spaced apart and at least one of these channels (2) offset in the axial direction at least partially with another in the circumferential direction Channel (3) overlaps. Cylinder according to claim 1 or 2, wherein the first channel (3) and the second channels (2a, 2b) extend in the axial direction of the cylinder (1). Cylinder according to claim 1, 2 or 3, wherein the first channel (3) and the second channels (2a, 2b) overlap each other in the axial direction by the same width (d). Cylinder according to one of the preceding claims, wherein the overlap of the first channel (3) with one or both second channels (2a, 2b) 5%, 10%, 20%, 30% or 40% of the axial length of the respective second channel (2a , 2b). Cylinder according to one of the preceding claims, wherein the second channels (2a, 2b) are arranged axially aligned. Cylinder according to one of the preceding claims, wherein the first channel (3) extends almost completely or completely over the width or axial length of the cylinder (1). Cylinder according to one of the preceding claims, wherein the second channels (2a, 2b) are offset by the same angle in the circumferential direction from the first channel (3), A cylinder according to any one of claims 1 to 6, wherein the second channels (2a, 2b) are circumferentially offset with a different diaper relative to the first channel (3). Cylinder according to one of the preceding claims, wherein the displacement angle between the first channel (3) and a second channel (2a, 2b) is 90 °, 180 ° or 270 °. Cylinder according to one of the preceding claims with a register cam (4) in the first channel (3), in order to enable a centered and / or central suspension of a lining. Use of a cylinder according to one of the preceding claims as a forme cylinder and / or as a transfer cylinder.

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