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Description  |
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BACKGROUND INFORMATION
1. Field of the Invention
The present invention relates to a device for guiding material webs in
rotary presses, in particular rotary presses used for producing print runs
having different print volumes.
2. Background of the Invention
German Patent Application No. 195 39 693 A1 describes a device for pulling
off superposed webs in a rotary press. In this related art configuration,
a draw-off roller is provided between a print unit and a folding device;
the draw-off roller is driven with a circumferential speed and set into a
rotation that is adjusted to be higher than that of an impression
cylinder. Provision is made for a plurality of pressure rollers, which are
able to be forced to engage or disengage with the margins at both ends of
a plurality of printed webs, which are laid one over another and around
the outer peripheral area of the draw-off roller. The pressure rollers are
rotatable and are provided at both ends along the outer peripheral surface
of the draw-off roller. A pressing device is also provided for pressing
the pressure rollers onto the margins at both ends of the printed webs,
which are laid around the outer peripheral area of the draw-off roller.
The multiplicity of the printed webs supplied by the print unit are laid
one over another and guided around the outer peripheral surface of the
draw-off roller, are each pressed at their margins, at both ends, by a
plurality of pressing webs, against the outer peripheral surface of the
draw-off roller, and pulled off by the driving and rotation of the
draw-off roller, to ultimately arrive in the folding device.
German Patent Application No. 41 28 797 A1 refers to a paper web guide
assembly in rotary presses. In the case of a paper web guide assembly for
rotary presses having six plate-width printing cylinders, the object is to
achieve substantial flexibility in the variation of paper web ribbons or
segments with little outlay for equipment. Six folder formers are arranged
on three planes for the paper web ribbons. This enables greater
variability to be achieved in the mixing and uniting of individual
ribbons, thereby substantially enhancing production flexibility, for
example in a newspaper rotary press.
Japanese Patent Document No. 5-27402-U is directed to a folding device for
rotary presses. Folding apparatuses, which are arranged downstream from
rotary presses, include a plurality of folding sections. Two inner folding
devices are provided, two folder formers being arranged in pairs; two
formers are provided on a top plane, two others on a bottom plane; two
outer folding units are mounted at both sides of the angle-bar
superstructure at the level of the two inner folding units, a small
clearance remaining therebetween. Also provided is a pull roller, which
cooperates with a slitting knife, which longitudinally slits a material
web being fed to the inner folding units. There are two angle-bar decks,
so that the web path of one of the two longitudinally slit web halves can
be exchanged for the other.
German Patent No. 32 37 504 C2 discusses a paper web for rotary presses. A
paper web guiding mechanism is provided in a rotary press having a number
of paper web guide rollers between printing units and formers of a folding
apparatus. At least two formers are disposed side-by-side on a common
horizontal plane, and at least one slitting device is provided for
dividing a paper web into a remaining web and one partial web per paper
web. Also provided on the same plane directly adjacent to the other folder
formers, is an additional folder former that extends beyond the maximum
paper web width. The paper web guide rollers upstream from a former infeed
roller are designed to be at least one fourth longer than a maximum width
of one of the printable paper webs in the printing units. For each paper
web, two angle bars are provided, one of which is displaceably mounted
transversely to the paper web's direction of travel.
Newspaper production often requires printing several editions on rotary
presses. The editions are prepared in larger or smaller print runs,
depending on whether they are intended for larger or smaller distribution
regions. For that reason, several different rotary presses are needed to
be able to print the editions one after another.
When one single edition is produced on merely one rotary press and, in
fact, in successive intervals, this leads to a longer production time for
the total edition. Inevitably, the decision to print one edition on two
rotary presses is made in view of the large capital investments required
for the second printing machine.
SUMMARY OF THE INVENTION
On the basis of the related art approaches outlined here, an object of the
present invention is to produce print runs of different lengths
independently of one another on a double-width rotary press.
The present invention provides a device for guiding material webs (A, B, C,
D; E, F, G, H), via an angle-bar deck (2) of a folding section that is
subdivided into a plurality of planes (3.1, 3.2, 3.3), from where the
material webs (A through D), (E through H) enter folding apparatuses (4),
(5). The present invention is characterized in that accommodated on
longitudinal folding devices (8), (9) are infeed elements (7), which have
guide sections (13), (14), which are able to be operated independently of
one another.
There are many diverse advantages associated with the device according to
the present invention. Subdividing the rotating guide element into guide
sections that can be operated independently of one another allows a rotary
press to be continuously operated to produce a large print run; on the
other hand, a smaller print run can be produced independently of the large
print run. This smaller print run can be guided over one of the
independent guide sections, without have any adverse effect on the
printing of the large print run. Thus, a double-wide newspaper rotary
press makes it possible to independently and simultaneously produce
different-volume print runs. Printing of the long print run can continue
after the short print run is already finished printing, so that an
additional print job can be prepared on the remaining, now available guide
section. When working with newspaper and commercial web presses, the
editions usually include completely identical sections, and are
distinguished from one another only by inserts or local sections. These
inserts or local sections can be printed individually in smaller, i.e.
short print run, editions, independently of a longer print job, and
simultaneously on one and the same rotary press.
In one advantageous refinement of the inventive idea, the guide element is
fashioned, for example, as a former infeed roller and arranged above a
folder former of one or a plurality of folder formers. A separate drive
can be assigned to each of the two guide sections, it being possible for
the drives to be driven independently of one another.
The former infeed-roller surfaces forming a traversing, rotating surface
are rotatable with respect to one another and can be joined to one
another, for example by way of a free-wheeling mechanism which permits
both guide roller sections to rotate in common, as well as, in each case,
separately with respect to one another. A mounting support for the former
infeed roller that takes up as little construction space as possible is
achieved by using one of the guide roller sections as a mounting support
for the other guide roller section.
For that, a projection of a guide roller section--for example, a
bearing--can engage with form locking in a recess at the other guide
section. Besides a free-wheeling mechanism, a coupling, a neck-recess
bearing arrangement, other devices, such as ball bearings, lubricated
sleeve bearings, and the like would be quite suited for enabling
independent rotation between the guide sections.
The folding sections in the superstructure each contain a plurality of
longitudinal folding units. A plurality of longitudinal folding units can
be mounted side-by-side in the folding apparatus superstructure. The
longitudinal folding units are able to be positioned side-by-side, in
pairs, for example, on three planes, thereby facilitating great
variability in production when working with newspaper rotary presses.
Rotating web guide rollers in the superstructure, downstream from the
dryer, in the cooling roller section, as well as upstream from the
printing units in the imprinting unit area, can likewise be equipped quite
advantageously with roller sections capable of being operated
independently of one another. The web guidance can be so conceived that,
during printing, parts of the web traverse all printing units, while other
parts are guided, above or below individual print units, by-passing the
same. This kind of flexibility is necessary if one is to always
effectively utilize newspaper printing presses to capacity, as they
represent substantial investments. The device proposed by the present
invention further enhances the effective utilization of a printing press
to capacity.
The web guide roller, which can be used, for example, as a former infeed
roller, can be operated in superstructures both with and without slitting
devices, the provision of slitting devices further enhancing the
flexibility and versatility of a rotary press. The divided web guide
roller is preferably used in newspaper rotary presses, however its
application in commercial web presses is conceivable.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is elucidated in the following on the basis of the
drawing, in which:
FIG. 1 shows a schematic view of a rotary press having two printing groups,
each having three four-high units, including a common superstructure and
common folding section;
FIG. 2 shows the web guide roller provided in accordance with the present
invention having web guide sections capable of being operated
independently from one another; and
FIG. 3 shows an illustration of the longitudinal folding device provided in
the superstructure.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1 depicts a schematic view of a rotary press having two printing
groups, each having three four-high units, including a common
superstructure and common folding section. In this configuration, two
printing groups 1, 6 are each provided with three four-high units, from
which printed, multilayer web ribbons are fed via structure 2 to an angle
bar common to both printing groups 1, 6. In angle-bar deck 2, which
accommodates a plurality of variably positioned, stationary or
displaceable angle bars 2.1, the differently printed material webs in
printing groups 1 and 6, respectively, are brought together in accordance
with the desired product array--i.e., in accordance with the various
newspaper inserts--placed one over the other and, subsequently, further
processed in cylinder sections of folding apparatuses 16, 17 (FIG. 3).
In first printing group 1, made up of four-high units 1.1, 1.2, and 1.3,
material webs A, B, C and D are each printed using a different print unit
configuration. Web A of print group 1 is printed 4/1 in first four-high
unit 1.1, i.e., a top side of web A is printed in the superjacent print
units, in succession in cyan, magenta, yellow and black, while the
corresponding bottom side is printed black in four-high unit 1.1, in its
top-most print unit, before web A leaves four-high unit 1.1. After exiting
four-high unit 1.1, 4/1 printed web A enters the angle bars via structure
2.
In second four-high unit 1.2 of printing group 1, webs B and C are each
printed with a different color pattern on the top and bottom side. Web B
enters laterally into second four-high unit 1.2 and is printed black on
both sides in the two top-most print units of four-high unit 1.2, before
again exiting four-high unit 1.2 in the direction of angle-bar deck 2. Web
C is printed 4/1 in four-high unit 1.2. It enters four-high unit 1.2,
above the first print unit pair, and is guided around the transfer
cylinder of the bottom print unit, cyan and yellow being printed there one
after another on its top side. Web C subsequently traverses the other
print units, where it is printed magenta and black. In the third print
unit in four-high unit 1.2, web C is printed black on its top and bottom
side. Web C, which at this point is likewise 4/1 printed, then exits
four-high unit 1.2 below the top-most print unit of four-high unit 1.2, in
which material web B has already been printed on both sides, 1 over 1.
In four-high unit 1.3 remaining in printing group 1, web D is printed when
passing through all print units 4/4, web D running strictly vertically.
Web D exits four-high unit 1.3, at the top end, in order to enter
angle-bar superstructure 2.
For the sake of completeness, it is mentioned here that the four-high unit
gets its name from the fact that two mutually opposing print units are
mounted in each of these four print units. Below the structure only
schematically shown in FIG. 2 and the web paths of the four-high units,
the reel or roll changers that take up the web supply rollers are
accommodated in the basement floors underneath the foundation. Through
these reel changers (not shown in greater detail here), the four-high
units of the two printing groups 1 and 6 are supplied with the web stock
to be printed.
Analogously to printing group 1, the other printing group 6 includes three
four-high units 6.1, 6.2 and 6.3, in which webs E, F, G and H are printed.
In the illustrated exemplary embodiment, web E is printed 4/4 in four-high
unit 6. 1, webs F and G are printed 4/2 and 1/1, respectively, in
four-high unit 6.2 analogously to second four-high unit 1.2 of first
printing unit 1. Web H is printed 4/4 in four-high unit 6.3. Since the web
guidance and color application characteristics in the other printing group
6 are analogous to those just discussed for printing group 1, reference is
made to the explanations already made in connection with printing group 1,
to avoid being repetitive.
Webs A, B, C, D and E, F, G and H running out of printing groups 1, 6 enter
into angle bar section 2; folded and united accordingly, from there, they
are introduced into folding section 3, which is made up of a plurality of
folding units, configured one over another in three planes 3.1, 3.2 and
3.3.
From there, webs A, B, C and D and E, F, G and H, respectively, enter into
the cylinder sections of the folding apparatuses.
FIG. 2 depicts in greater detail the web infeed roller according to the
present invention having web guide sections that are able to be operated
independently of one another.
Disposed side-by-side in pairs, in folding section 3 shown in FIG. 1, in
three superjacent planes 3.1, 3.2 and 3.3, respectively, are folder
formers 8, 9, over whose former noses 20, the web sections, having been
longitudinally folded there, run off. In the illustration according to
FIG. 2, web guide roller 7 functions as a divided former infeed roller 7,
having two roller sections 13 and 14 which are capable of being operated
independently of one another. The two roller sections 13 and 14 are each
provided with one drive 11 and 12, respectively. The two roller sections
13 and 14 are joined to one another in such a way that one roller section
13 and 14, respectively, acts as a bearing support for the other roller
section. For this, accommodated between roller sections 13 and 14 can be a
coupling 10, which includes a neck 10.1, and hollow or recess 10.2,
respectively, which render possible a form-locking connection of the two
roller sections 13 and 14, respectively, without preventing their mutually
independent rotation. Besides a coupling 10, ball bearings, lubricated
sleeves, or other bearing forms can be implemented, which render possible
an independent rotation of the two web guide sections 13 and 14 relatively
to one another. This includes the possibility that one of web guide
sections 13 and 14, respectively, can also be shut down while the other
one is in the process of rotating. When working with double-wide newspaper
rotary presses, it is beneficial that former infeed rollers 7 extend, for
example, over the entire infeed width of both folder formers 8 and 9,
respectively. In this context, one of guide sections 13, 14 is assigned to
one folder former 8 and 9, respectively, so that, by way of former 8, a
single- or multi-layer web ribbon is able to be processed independently of
the web ribbon being fed over web guide section 14 into folder former 9.
When a plurality of web ribbons is involved, it is understood that webs A,
B, C and D can be longitudinally slit by slitting devices already provided
in angle-bar superstructure 2 or in full section 3 into partial webs A1,
A2; B1, B2, C1, C2, D1 and D3 (See FIG. 3). This applies analogously to
webs E, F, G and H, which can be divided by slitting devices into partial
webs E1, E2, F1, F2, G1, G2, H1 and H2. The individual partial webs, in
turn, can again be made of a plurality of web layers.
FIG. 3 illustrates the folding section in the superstructure in an enlarged
representation.
Two longitudinal folder formers 8, 9 are adjacently disposed in each of
three planes 3.1, 3.2 and 3.3. A former infeed roller 7 in accordance with
the present invention is located above folder formers 8 and 9,
respectively, which are disposed in plane 3.2.
Partial webs H1, H2 from printing group 6 run over folder former 8 in first
plane 3.1, while partial webs E1, E2, F1 and F2 are longitudinally folded
over adjacent folder former 9. Partial webs E1, E2, F1, F2 run past planes
3.2 and 3.3, respectively, into cylinder section 17 of a folding
apparatus. Longitudinally folded partial webs H1, H2 run off a divided web
guide roller 7, and are led past bottom-most plane 3.3, to likewise be fed
into folding apparatus cylinder section 17.
Disposed on second plane 3.2 above longitudinal folder former 8, 9 is
former infeed roller 7, subdivided into two web guide sections 13 and 14,
respectively, in accordance with the representation in FIG. 2, each of
which can be assigned to independent drive 11 and 12, respectively.
Partial webs A1, A2 run over web guide section 13; partial webs G1, G2 over
web guide section 14, and subsequent to longitudinal folding at folder
former 9, into folding-apparatus cylindrical section 17. On the other
hand, upstream from bottom-most folding plane 3.3, partial webs A1, A2 run
into folding-apparatus cylinder section 16.
In bottom-most folding plane 3.3, whose configuration is analogous to that
of folding plane 3.1, partial webs B1, B2 are longitudinally folded by
longitudinal folder former 8; and partial webs C1, C2, as well as D1 and
D2 by folder former 9. These run, together with partial webs A1, A2, which
are longitudinally folded in plane 3.2, into folding-apparatus cylindrical
section 16. The arrangement according to the present invention of divided
former infeed roller 7 enables either partial webs A1, A2 or partial webs
G1, G2, to be guided independently of one another, in second plane 3.2 of
folding section 3. Depending on the size of the print run, guidance of
partial webs into different partial web ribbons is able to be achieved
using divided former infeed roller 7, so that partial webs E1, E2, F1, F2,
G1, G2, as well as H1 and H2 constitute a small print run, including a
separate folder feeding device, and one can terminate the printing of this
print run without adversely affecting the larger print run, made up of
partial webs A1, A2, B1, B2, C1, C2, as well as D1 and D2. Work on this
larger print run can be performed by way of separate delivery 18 assigned
to folding apparatus 16 independently of delivery 19 in folding-apparatus
cylinder section 17.
Cylinder sections 16, 17 can be for example include cutting cylinders for
forming printed products, such as rotary blade folders.
The example elucidated here of a web guidance through folding section 3 is
merely one of many possible examples of web guidance. Partial web ribbons
A1, A2, B1, B2, C1, C2, as well as D1 and D2 could just as easily be print
runs of a smaller print job, and partial web ribbons E1, E2, F1, F2, G1,
G2, as well as H2 and H2, print runs of a larger print job. Also, former
infeed roller 7 could be mounted on a different plane than plane 3.2 shown
in FIG. 3, for example on all three planes 3.1, 3.2, 3.3 of folding
section 3.
The present invention quite substantially improves production flexibility
on web-fed rotary presses--particularly on newspaper rotary presses. Web
guide rollers divided in accordance with the present invention can not
only be used as former infeed rollers 7 in a folding section 3, but can
likewise be installed as web infeed rollers, dancer rollers, web tension
rollers, and as pull rollers for the material web, which are integrated in
the particular web paths in the rotary press. For the sake of
completeness, it is mentioned that the formats produced in folding section
3 in accordance with the present application are preferably tabloid
formats or simple cross fold formats, which are perfectly customary
formats used in folding operations in newspaper rotary presses. Tabloid
formats or cross fold formats produced in such a manner in
folding-apparatus cylinder sections 16, 17 downstream from folding section
3 can be followed, already in folding section 3 above the cylinder
sections, by cross fold operations, double parallel folding operations, as
well as by delta fold operations, so that copies delivered in delivery
locations 18 and 19, respectively, can be produced in all common newspaper
formats.
Reference Symbol List
2. first printing group
1.1 four-high unit 4/1
1.2 four-high unit 4/1, 1/1
1.3 four-high unit 4/4
2. angle-bar deck
2.1 angle bars
3. folding section
3.1 first plane or level
3.2 second plane or level
3.3 third plane or level
4. first folding section
5. second folding section
6. second printing group
6.1 four-high unit 4/4
6.2 four-high unit 4/1, 1/1
6.3 four-high unit 4/1
A web of first group
A1 web ribbon
A2 partial web ribbon
B web of first group
B1 partial web ribbon
B2 partial web ribbon
C web of first group
C1 partial web ribbon
C2 partial web ribbon
D web of first group
D1 partial web ribbon
D2 partial web ribbon
E web of second group
E1 partial web ribbon
E2 partial web ribbon
F web of second group
F1 partial web ribbon
F2 partial web ribbon
G web of second group
G1 partial web ribbon
G2 partial web ribbon
H second group
H1 partial web ribbon
H2 partial web ribbon
7. divided web roller
8. first folding unit
9. second folding unit
10. coupling
10.1 neck
10.2 recess
11. drive
12. drive
13. first guide roller section
14. second guide roller section
15. folder former level
16. cylinder section
17. cylinder section
18. first delivery of copy
19. second delivery of copy
20. folder former nose
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