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Description  |
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FIELD OF THE INVENTION
The present invention is directed to an arrangement for processing a web, to a folded product of a web-fed rotary printing press, and to a web-fed rotary printing press.
BACKGROUND OF THE INVENTION
DE 25 28 008 A1 shows a printing press for a direct printing method, and having forme cylinders which can be equipped with six printing plates in the axial direction, and with two printing plates in the circumferential direction, and having
counter-pressure cylinders which can be supplied with three printing blankets in the axial direction, and with one printing blanket in the circumferential direction. The printing plates, which are arranged side-by-side, as well as the printing blankets,
which are arranged side-by-side, are each arranged offset in the circumferential direction.
DE 25 10 057 A1 also discloses a printing press for the direct printing method. The forme cylinder, which works together with a counter-pressure cylinder, supports six printing plates over its width and two printing plates on its circumference.
A printing group with forme, transfer and counter-pressure cylinders is known from JP 56-021860 A. Each one of the three cylinders is driven by its own drive motor.
A triple-width web-fed rotary printing press, with two formers arranged on two levels, that are located one on top of the other, is known from DE 41 28 797 A1.
A printing press with printing groups of a width of six newspaper pages is known from "Newspapers & Technology", December 2000. The printing groups are configured as bridge printing groups. The transfer cylinders are covered by rubber blanket
sleeves.
WO 01/70608 A1 discloses a turning bar arrangement, in which two turning bars, which are substantially of a partial web width, are displaceably arranged on a support transversely to the direction of the incoming partial web. A register roller is
arranged at the respective sides outside of the lateral frames. Its longitudinal axis extends substantially parallel with the lateral frame. It can also be displaced along a rail in a direction transverse to the direction of the incoming partial web.
A folding assembly is known from U.S. Pat. No. 4,671,501. Two formers are arranged above one another wherein, after passing over lead rollers, webs are linearly cut ahead of a third former, the partial webs are turned by 90.degree. via a
third former, and are subsequently combined into two strands and are conducted to the two formers which are arranged above one another.
A folding assembly with two groups of formers, which are offset with respect to each other, is known from EP 1 072 551 A2. A harp, i.e. a group of collection, receiving or harp rollers, is arranged above each of the groups of formers, over which
the respective partial webs are conducted to the assigned groups of formers.
A folding assembly is known from WO 97/17200 A2. Cut partial webs, which are offset transversely with respect to each other, are conducted to various formers. The formers, that are arranged horizontally side-by-side, are also partially arranged
vertically offset with respect to each other.
DE 44 19 217 A1 shows a superstructure of a web-fed rotary printing press with a turning device. Partial webs are offset by one-half of a partial web width in order to conduct them on top of each other and to a common former.
SUMMARY OF THE INVENTION
The object of the present invention is directed to producing an arrangement for processing a web, to a folded product of a web-fed rotary printing press, and to a web-fed rotary printing press.
In accordance with the present invention, this object is attained by the provision of an arrangement for processing a web including a turning device which is usable for offsetting a web by an odd-numbered multiple of half of the web width. The
arrangement also includes a folding structure. The offset web is conducted to two formers, which are arranged side-by-side transversely to the running direction of the web. The resultant folded product of the web-fed rotary printing press, in which
each of the two side-by-side formers has a width of two printed pages, is two strands of longitudinally folded products, or intermediate products. The two products have at least one partial web of a width of two printed pages of a partial web which
previously had been two printed pages wide.
The advantages to be gained by the present invention rest, in particular, in that a simple, cost-effective and space-saving construction, together with the provision of a high variability of the product or intermediate product, is made possible.
Advantages also lie, in particular, in that, in comparison to double-width printing presses, the production dependability is considerably increased with the same target size of a product. Also, when retaining the number of printing units, the
yield of the printing press, or of each printing group, can be increased by 50%.
The number of roll changers, and their associated investment costs, the frequency of roll changes and the resultant loss of production dependability, as well as the set-up time when drawing in webs and the increase in cycle times, can all be
reduced for the same production size in comparison with a double-width printing press.
In an advantageous embodiment, the printing units are structured as nine-cylinder satellite printing units, which results in high precision of the ink register, and otherwise in a low-oscillation construction. Oscillations are also reduced by
the advantageous arrangement, structure and fastening of dressings on the cylinders. For one, openings on the shell surface in the circumferential direction are minimized. It is furthermore also possible to arrange the openings, at least on the
transfer cylinder, alternatingly offset in the circumferential direction, in such a way, that a closed shell surface always works together with the forme or satellite cylinder, at least over the length of a section of the forme or satellite cylinder.
Thirdly, out-of-roundness and production costs are minimized because, although channels which are axially dispersed on the barrel over its entire effective length are provided, openings in the direction toward the shell surface only exist in the
mentioned sections. Devices for fastening of dressing ends and/or fillers are selectively inserted into the channels.
At least six devices for the axial positioning of printing formes are arranged in the channel or channels of the forme cylinders. These devices are embodied, for example, as register pins that are positively acting together with the printing
forme ends, which are arranged inside the channel and which can be axially movable manually or by remote control.
For equipping the forme cylinders with printing formes which can be reproduced with exact registration and color congruence, the configuration of the printing groups with associated pressing devices is advantageous. Because of these, it is
possible to fix dressings, resting on the shell surface of the cylinders, in place by use of respectively at least one pressing element, as needed, while one end of a dressing or of several dressings is or are released for being removed or attached.
The drive mechanism of the satellite cylinder, or cylinders, which is mechanically independent of the pairs of cylinders, offers particular advantages, with respect to a possibility of a variable operation. Thus it is possible, for example, to
perform a set-up operation during production, for example a flying printing forme change, or a forme washing. On the other hand, a web can be drawn in while other cylinders, or other pairs of cylinders, are stopped or are being cycled through a set-up
program. If rubber blankets, with positively or negatively conveying properties, are present, it is also advantageous to operate the satellite cylinder with a surface speed which differs from that of the remaining cylinders.
In an advantageous embodiment of the present invention, a superstructure of the printing press has at least one longitudinal cutting device with at least five cutters, which cutters are spaced apart from each other transversely to the paper
conveying direction. In an advantageous embodiment, two register elements, which can be moved transversely, with respect to the paper conveying direction, are provided for each printing tower, or respectively for each eight print positions, for
compensating for the paths of the partial webs. In a further development, these register elements can be structurally connected with respective turning devices, each of the width of a partial web. Also, subsequent guide elements, which are only
assigned to partial webs, are, for example, substantially embodied to have only a partial web width. These configurations make possible a low-oscillation, and therefore also an exactly matching conveyance of the web. Fluctuations in the web tension,
occurring, for example during load changes, or during a change of the printing speed, and caused by the inertia of long, thick guide elements only driven by the partial web or webs, can be effectively reduced.
With a view to dependable operation and to a cost-saving construction, it is also advantageous to provide the possibility of turning a partial web by an odd-numbered multiple of half a partial web in the superstructure. With this, the draw-in
and imprinting of partial webs of half a former width, for example a newspaper page can be omitted.
In connection with the reduction of costs and for providing a space-saving construction, it is advantageous, in one embodiment, to place a so called harp, i.e. a plurality of lead rollers which, as a rule, are not driven, ahead of only one of two
formers, which are themselves arranged above one another. Webs can be transported from the harp to the other former. Strands of variable sizes or numbers of partial webs of the same alignment can be supplied to the two formers which are arranged
vertically above one another.
In one preferred embodiment, partial webs from one harp assigned to the one group of formers can be supplied to the other group of formers, and vice versa. In an advantageous embodiment, a so-called harp, i.e. a plurality of lead rollers, which
are also called collecting or receiving rollers, is to be placed ahead of only one of two formers that are arranged above each other. Webs from the common harp can then be transferred to the other former. Strands of variable size, or numbers of partial
webs of the same alignment, can be supplied to the two formers which are arranged vertically above one another.
In an advantageous embodiment of a turning device, the partial web can be displaced, or is displaced, only by an odd-numbered multiple of half a partial web. In this way, it is possible, with little outlay, to avoid, for example, to have to
imprint very narrow webs, or to provide additional printing units. The construction of at least one of the turning bars, which at least one bar can be moved transversely in respect to the web, allows a large amount of variability.
The drive mechanism of rollers of the structure of the former and/or of the folding apparatus, which drive mechanism is mechanically independent from the printing units, is advantageous. This is the case particularly in respect to good
registration and variable operation.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention are represented in the drawings and will be described in greater detail in what follows.
Shown are in:
FIG. 1, a web-fed rotary printing press in a lateral view, in
FIG. 2, a schematic side view of a printing group, in
FIG. 3, a schematic top plan view of a printing group, in
FIG. 4, a cylinder dressing or cover, in a perspective representation, in
FIG. 5, a forme cylinder, a: in a perspective representation, b: in longitudinal section, c: with a holding element, and d: with a holding element with a register arrangement, in
FIG. 6, a transfer cylinder, a: in a perspective representation, b: in longitudinal section, c: with a holding element, d: with a filler element, e: a schematic longitudinal section, in
FIG. 7, a device for pressing a dressing against a cylinder, in
FIG. 8, a first preferred embodiment of a drive mechanism of a nine-cylinder printing unit, in
FIG. 9, a second preferred embodiment of a drive mechanism of a nine-cylinder printing unit, in
FIG. 10, a third preferred embodiment of a drive mechanism of a nine-cylinder printing unit, in
FIG. 11, an embodiment of the preferred embodiment in accordance with FIG. 8, in
FIG. 12, an outline of a superstructure, in
FIG. 13, a first preferred embodiment of a short register device, in
FIG. 14, a second preferred embodiment of a short register device, in
FIG. 15, an example of a web turning assembly, in
FIG. 16, a front view of a harp, with a turned web, in accordance with FIG. 15, in
FIG. 17, a folding structure of a web-fed rotary printing press in accordance with the present invention, in
FIG. 18, a side elevation view of the folding structure and with web guidance, and in
FIG. 19, a front elevation view of the folding structure of the present invention, with web guidance.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A web-fed rotary printing press in accordance with the present invention, and represented, by way of example, in FIG. 1, has a left press section and a right press section, each section having at least two printing towers 01. The printing towers
01 each have printing units 02 which are embodied to be, for example, at least of triple width, i.e. are configured for the imprinting, of respectively, six newspaper pages, which are arranged axially side-by-side. The printing units 02 are each
embodied as satellite printing units 02. The advantageous embodiment of each of the printing units 02 as a nine-cylinder satellite printing unit 02 assures a very good maintenance of color congruence, or a very small fan-out. The printing units 02 can
also be embodied as ten-cylinder satellite printing units 02, or possibly can also be embodied as printing units which can be operated in rubber-against-rubber printing, such as, for example, as several bridge printing units or as an H-printing unit 02.
Webs 03 from rolls, which are not specifically represented, are supplied to the printing units 02, in particular by the use of roll changers which are also not specifically shown.
One superstructure 04 for each section is provided downstream, in the direction of travel of a web 03 which is passing through the printing towers 01, or printing units 02, in this case, superstructure 04 is situated above the printing towers 01,
and in which superstructure 04 the web 03, or the webs 03, are cut by longitudinal cutting arrangements 06. The resultant partial webs can possibly be offset and/or cambered, the linear register of the partial webs can be aligned by the use of register
arrangements 08, only depicted schematically in FIG. 1, and these partial webs can be guided above each other. Downstream, as viewed in the web running direction, the superstructure 04 has at least one so-called harp 09 including a plurality of harp or
lead rollers, which are arranged above each other and which guide the webs 03, or the partial webs 03a, 03b, 03c. The harp 09 determines the entry into the former of the webs 03 or of the partial webs that are conducted above each other. The webs 03 or
partial webs undergo a change in direction as they pass through this harp 09, and are thereafter combined into either one strand, or several strands, and are conducted to at least one folding structure 11.
In the printing press shown in FIG. 1, two folding structures 11 are arranged between the two press sections, which two folding structures 11 each have formers respectively arranged, on two different levels located above one another, for example. However, the printing press can also have only one common folding structure 11, arranged between the sections, or can have only one section and one associated folding structure. Also, the respective folding structure 11 can be embodied with only one
level of formers. One or a plurality of folding apparatus 12 can be assigned to each folding structure 11.
Each printing unit 02 has a plurality, in the preferred embodiment depicted in FIG. 1 four, printing groups 13, by operation of which, ink from an inking unit 14 can be applied to the web 03 by operation of at least one cylinder 16 embodied as a
forme cylinder 16, as shown in FIG. 2. In the first embodiment of the printing unit 02 as a satellite printing unit 02, the printing group 13 is configured as an offset printing group 13 for wet offset printing and has, in addition to the inking unit
14, a dampening unit 20 and a further cylinder 17, embodied as transfer cylinder 17. Together with a cylinder 18 constituting a counter-pressure cylinder or thrust element, the transfer cylinder 17 forms a print position. In the example of FIG. 1, the
counter-pressure cylinder 18 is embodied as a satellite cylinder 18 which, together with further transfer cylinders 17 of further printing groups 13, constitutes further print positions when in the print-on position. In an embodiment of the printing
groups as a double printing group for rubber-against-rubber printing, the counter-pressure cylinder 18 could also be embodied as a transfer cylinder 18. If not required for their differentiation, identical parts are provided with the same reference
symbols. However, a difference in their spatial position can exist and is disregarded as a rule when identical reference symbols are provided.
In an advantageous embodiment, the inking unit 14 shown in FIG. 2 has an ink duct 15 which is extending laterally over six printed pages. In a different embodiment, three ink ducts 15, each of which may be approximately two printed pages wide,
are arranged side-by-side in the cylinder axial direction. In an advantageous embodiment, the dampening unit 20 is embodied as a spray dampening unit 20 with four rollers.
In a first embodiment, the forme cylinder 16 has a circumference between 850 and 1,000 mm, and in particular between 900 and 940 mm. For example, for receiving two vertical printed pages, for example two newspaper pages in broadsheet format, the
circumference is designed with two dressings or covers 19, for example two flexible printing formes 19, which can be fixed in place, one behind the other, in the circumfe | | |
