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Claims  |
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What is claimed is:
1. A web-fed rotary printing press capable of producing signatures each
having a predetermined number of pages including a plurality of center
spreads, comprising:
(a) a plurality of printing units for printing on separate webs of paper or
like printable material traveling in centerline alignment and in phase
with one another;
(b) angle guide means for turning a preselected web, which has been printed
in one of the printing units, 90 degrees out of phase with the other,
unselected webs;
(c) at least one preselected web former disposed downstream of the angle
guide means with respect to a traveling direction of the preselected web
for folding the preselected web along a centerline thereof, back into
phase with the unselected webs;
(d) means for superposing the preselected web, which has been folded by the
preselected web former, and the unselected webs, which have bypassed the
angle guide means and the preselected web former, one upon another, with
the fold of the preselected web in register with the aligned centerline of
the unselected webs;
(e) an unselected web former disposed downstream of the superposing means
with respect to a traveling direction of the superposed webs and displaced
90 degrees out of phase with the preselected web former for folding the
superposed webs along the aligned centerline of the unselected webs; and
(f) means disposed downstream of the unselected web former for transversely
cutting the folded webs into individual multiple-page signatures each
having at least two center spreads.
2. The rotary printing press of claim 1 further comprising lead-in guide
means for permitting any of the webs that have been printed by the
printing units to be fed to the angle guide means as a preselected web and
for guiding the unselected webs around the angle guide means and the
preselected web former and directly to the superposing means, whereby at
least one center spread can be placed between any desired pages on one
side of centerline folds of each signature.
3. The rotary printing press of claim 1 wherein the angle guide means is
angularly displaceable for turning the preselected web 90 degrees out of
phase with the unselected webs in either of two opposite directions, and
wherein the preselected web former is angularly displaceable for folding
the preselected web along the centerline thereof regardless of which
direction the preselected web has been turned in by the angle guide means,
whereby at least one center spread can be placed on either side of
centerline folds of each signature.
4. A web-fed rotary printing press capable of producing signatures each
having a predetermined number of pages including a plurality of center
spreads, comprising:
(a) a plurality of printing units for printing on separate webs of paper or
like printable material traveling in centerline alignment and in phase
with one another;
(b) at least two angle guide means each for turning one preselected web,
which has been printed in one of the printing units, 90 degrees out of
phase with unselected webs;
(c) at least two preselected web formers each disposed downstream of one
angle guide means with respect to a traveling direction of one preselected
web for folding one preselected web along a centerline thereof, back into
phase with the unselected webs;
(d) means for superposing the preselected webs, which have been folded by
the preselected web formers, and the unselected webs, which have bypassed
the angle guide means and the preselected web formers, one upon another,
with the folds of the preselected webs in register with the aligned
centerline of the unselected webs;
(e) an unselected web former disposed downstream of the superposing means
with respect to a traveling direction of the superposed webs and displaced
90 degrees out of phase with the preselected web formers for folding the
superposed webs along the aligned centerline of the unselected webs; and
(f) means disposed downstream of the unselected web former for transversely
cutting the folded webs into individual multiple-page signatures each
having at least three center spreads.
5. The rotary printing press of claim 4 wherein the two angle guide means
and the two preselected web formers are oriented in the same direction,
whereby two center spreads are created on the same side of centerline
folds of each signature.
6. The rotary printing press of claim 5 further comprising lead-in guide
means for permitting any two of the webs that have been printed by the
printing units to be fed to the respective angle guide means as
preselected webs and for guiding the unselected webs around the angle
guide means and the preselected web formers and directly to the
superposing means, whereby two center spreads can be placed between any
desired pages, either consecutively or individually, on one side of
centerline folds of each signature.
7. The rotary printing press of claim 4 wherein the two angle guide means
and the two preselected web formers are oriented in opposite directions,
whereby two center spreads are created on opposite sides of centerline
folds of each signature.
8. The rotary printing press of claim 7 further comprising lead-in guide
means for permitting any two of the webs that have been printed by the
printing units to be fed to the respective angle guide means as
preselected webs and for guiding the unselected webs around the angle
guide means and the preselected web formers and directly to the
superposing means, whereby two center spreads can be placed between any
desired pages on opposite sides of centerline folds of each signature.
9. A web-fed rotary printing press capable of producing signatures each
having a predetermined number of pages including a plurality of center
spreads, comprising:
(a) a plurality of printing units for printing on separate webs of paper or
like printable material traveling in centerline alignment and in phase
with one another;
(b) first angle guide means for turning a first preselected web, which has
been printed in one of the printing units, 90 degrees out of phase with
unselected webs;
(c) second angle guide means for turning a second preselected web, which
has been printed in another of the printing units, 90 degrees out of phase
with unselected webs;
(d) third angle guide means for turning a third preselected web, which has
been printed in still another of the printing units, 90 degrees out of
phase with unselected webs;
(e) a first preselected web former disposed downstream of the first angle
guide means with respect to a traveling direction of the first preselected
web for folding the first preselected web along a centerline thereof, back
into phase with the unselected webs;
(f) a second preselected web former disposed downstream of the second angle
guide means with respect to a traveling direction of the second
preselected web for folding the second preselected web along a centerline
thereof, back into phase with the unselected webs;
(g) a third preselected web former disposed downstream of the third angle
guide means with respect to a traveling direction of the third preselected
web for folding the third preselected web along a centerline thereof, back
into phase with the unselected webs;
(h) means for superposing the first to third preselected webs, which have
been folded by the first to third preselected web formers, and the
unselected webs, which have bypassed all the angle guide means and all the
preselected web formers, one upon another, with the folds of the
preselected webs in register with the aligned centerline of the unselected
webs;
(i) an unselected web former disposed downstream of the superposing means
with respect to a traveling direction of the superposed webs and displaced
90 degrees out of phase with each preselected web former for folding the
superposed webs along the aligned centerline of the unselected webs; and
(j) means disposed downstream of the unselected web former for transversely
cutting the folded webs into individual multiple-page signatures each
having at least four center spreads;
(k) at least one of the three angle guide means and at least one of the
three preselected web formers are oriented in a direction opposite to the
orientation of the other angle guide means and the other preselected web
formers, whereby at least one center spread is created on one side, and
two other center spreads on the other side, of centerline folds of each
signature.
10. The rotary printing press of claim 9 further comprising lead-in guide
means for permitting any three of the webs that have been printed by the
printing units to be fed interchangeably to the three angle guide means as
preselected webs and for guiding the unselected webs around the angle
guide means and the preselected web formers and directly to the
superposing means, whereby two center spreads can be placed between any
desired pages, either consecutively or individually, on one side of the
centerline folds of each signature, and one other center spread between
any desired pages on the other side of the centerline folds of each
signature. |
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Claims |
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Description |
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BACKGROUND OF THE INVENTION
This invention relates to printing presses in general and, in particular,
to a web-fed rotary printing press capable of producing multiple-page
signatures or sections each including two or more "center spreads," by
which term is meant the sheets of paper or other printable material each
bearing a pair of facing pages, irrespective of the presence or absence of
columnar division between the pages, of the matter printed thereon, or of
the positions of these sheets relative to the other sheets of the
signature.
The rotary printing press has been known and used extensively in which a
plurality of webs from separate stocks or rolls are concurrently printed
upon, superposed one on top of another, fed through a device that gives
them their down-the-middle fold, and cut into individual sheets. There are
thus obtained signatures each consisting of a predetermined number of
pages in consecutive order. Produced in this familiar manner, however,
each signature has only one center spread, only one paper bearing two
center facing pages in the inmost position of the folded signature.
Attempts have been made in recent years at production of signatures each
having two or more center spreads. Japanese Unexamined Patent Publication
No. 10-29387 represents one conventional approach to this objective,
teaching a web-fed rotary printing press designed explicitly for
production of multiple-center-spread newspapers. This prior art apparatus
comprises a slitter for cutting the web along its centerline into a pair
of web halves, a first triangular shaped former for folding a first web
half down the middle, a second similar former for similarly folding a
second web half, and guide means for directing the folded first web half,
which is to form additional center-spreads, between the desired pages of
the multiple-page sections formed from the second web halves.
To dwell a bit more on this prior art apparatus, the two formers are
oriented in the same direction along the paths of the web halves just
downstream of the slitter. Consequently, the first web half, which is to
form folded additional center spreads, lies, on being folded by the first
former, in a plane that is displaced 90 degrees from that of the second
web half traveling toward the second former; that is, the first web half
is then at 90 degrees out of phase with the second. An angled guide bar
(turning bar) and guide rollers are therefore provided between the two
formers in order to correct the 90-degree phase displacement of the first
web half, bringing the same back into phase with the second web half and
further aligning the fold of the first web half with the centerline of the
second web half. Then, with the first web half superposed on the second,
both web halves are guided to the second former. The thus folded web
halves are subsequently cut and folded transversely, into signatures
including the additional center spreads.
It is stated in the specification of the noted unexamined patent
publication that another additional former may be provided to insert
another additional center spread into each signature. It is also said that
the production of multiple-center-spread signatures of very large numbers
of pages is possible by adding angle guide bars and associated rollers.
An objection to this prior art contrivance concerns in particular the
angled guide bar between the two formers. Since these formers are oriented
in the same direction, the interposition of the angled guide bar between
the formers is a requisite to return the first web half, which has been
turned 90 degrees in phase on being folded by the first former, back into
phase with the second web half before they come to the second former.
Essentially in the form of a fixed rod, the guide bar has introduced
considerable friction to the web half. The consequences of such friction
have been especially inconvenient because the web half has been previously
doubled up. The two folds of the web half have been very easy to slip
longitudinally one over the other, resulting in wrinkling, as well as
transversely, resulting in both wrinkling and deviating of the web half
away from the predetermined path. In either case the production of the
press has suffered immensely in quality.
Another known approach to multiple-center-spread signatures is found in the
article entitled, "Development of Double Center Spread Systems, " in the
1997-1 issue, No. 159 Pages 78-81, of Newspaper Technology published by
Japan Newspaper Association on Mar. 25, 1997. The article suggests the
provision of two formers in vertically spaced positions for folding two
webs in the folding section of a rotary printing press. Between the two
formers are, here again, an angled guide bar, a set of rollers for guiding
the web from the upper former to the bar, and another set of rollers for
guiding the web from the bar to the lower former.
The upper former longitudinally folds a web that is to provide an
additional center spread. The angled guide bar turns the folded web 90
degrees in phase, into a face-to-face relationship with the other webs
which have been printed by other printing units but which are not yet
folded. The additional center-spread web, folded and turned 90 degrees, is
inserted between the unfolded other webs, with the fold of the folded web
in register with the centerlines of the unfolded webs. The superposed webs
subsequently travel past the lower former, by which only the unfolded webs
are folded. The webs, now all folded, are then cut and folded transversely
into signatures of a predetermined number of pages, in which there are at
least two center spreads.
This second prior art system is also said to permit adaptations for greater
numbers of center spreads in each signature, by providing an additional
former or formers and additional angled guide bar or bars, together with
an additional web or webs to provide an additional center spread or
spreads. After being printed, folded, and turned 90 degrees in phase, such
additional web or webs are to be inserted between on the other printed
webs before the latter are folded at its own former.
Just like the first recited prior art device, this second one has the
angled guide bar together with the associated rollers for turning the
first web 90 degrees as it travels between the two formers which are
oriented in the same direction. Traveling in frictional engagement with
the angled bar, the web has been just as likely to give rise to the noted
inconveniences as in the first prior art device. An additional drawback is
that, disposed in the narrowly confined space between the two formers, the
guide bar and rollers have been very difficult of maintenance.
Both guide bar and guide rollers can be dispensed with, and the
difficulties arising therefrom overcome, if the two formers are oriented
with an angular difference of 90 degrees therebetween, as indeed disclosed
in Japanese Unexamined Utility Model Publication No. 58-87748. However,
this conventional device merely teaches to fold a web twice longitudinally
by guiding it through the successive formers. It discloses no means
whatsoever for guiding one folded web into superposition with other,
unfolded webs before feeding these webs to the other former. This known
device should not therefore be taken as anticipatory of the instant
invention, it being totally unapplicable to the creation of
multiple-center-spread signatures.
SUMMARY OF THE INVENTION
The present invention has it as an object to create one or more additional
center spreads in each multiple-page signature produced by a rotary
printing press and, in so doing, to defeat all the inconveniences and
difficulties encountered heretofore.
A more specific object of the invention is, in feeding from one former to
another the web to form an additional center spread in each signature, to
make its travel smoother and more friction-free than heretofore thereby
avoiding the wrinkling of the web or its deviations from the normal path.
Another object of the invention is to make possible the insertion of an
additional center spread between any two desired pages of each signature.
A further object of the invention is to make possible the insertion of one
or more additional center spread between any two desired pages on either
side of the centerline folds of each signature.
A further object of the invention is to make possible the insertion of one
or more additional center spreads between any two desired pages on each of
opposite sides of the centerline fold of the signature.
A still further object of the invention is to make the rotary printing
press readily adaptable for creation of practically any desired number of
center spreads in each signature.
The present invention may be summarized as a web-fed rotary printing press
comprising a plurality of printing units for printing on as many webs of
paper or like printable material traveling in centerline alignment and in
phase with one another. A preselected one of the printed webs is first
turned 90 degrees out of phase with the other, unselected webs by angle
guide means and then along its centerline by a first former, herein termed
preselected web former, back into phase with the unselected webs. The
preselected and unselected webs are then all superposed one upon another,
with the fold of the preselected web in register with the aligned
centerline of the unselected webs. Disposed downstream of the superposing
means is a second former, herein termed unselected web former, which is
offset 90 degrees out of phase with the preselected web former for folding
the superposed webs along the aligned centerline of the unselected webs.
Then the folded webs are conventionally cut into predetermined lengths,
and preferably folded across the middle as in the case of newspaper
production, to provide multiple-page signatures each having at least one
center spread, formed by the preselected web, in addition to the usual
inmost center spread formed by one of the unselected webs.
It should be noted that the present invention suggests a reversal of the
conventional practice of prefolding a preselected web at 90 degrees out of
phase with the unselected webs and then guiding the prefolded web back
into phase with the unselected webs. The preselected web is first guided
at 90 degrees out of phase with the unselected webs according to the
invention and then folded by the preselected web former, which is 90
degrees out of phase with the unselected web former, back into phase with
the unselected webs. Both preselected and unselected webs all travel in
phase with one another from preselected web former to unselected web
former via the superposing means.
Thus, being not required to undergo any change in phase after being folded
by the preselected web former, the preselected web is not to suffer
wrinkling or relative displacement of its folds as it travels with the
other webs to the unselected web former. The preselected web will
therefore be turned into flawlessly printed, folded, and positioned center
spreads.
Preferably, lead-in guide means are provided for permitting any of the webs
that have been printed by the printing units to be fed to the angle guide
means as a preselected web and for guiding the unselected webs around the
angle guide means and the preselected web former and directly to the
superposing means. An additional center spread can be placed between any
desired pages on one side of the centerline folds of each signature.
In another preferred embodiment of the invention the preselected web former
is made angularly displaceable between positions of bilateral symmetry
with respect to a plane containing the tip of that former and the aligned
centerline of the unselected webs. Folded by this former, the preselected
web can then be placed on either side of the aligned centerline of the
unselected webs by the superposing means, providing an additional center
spread on either side of the centerline folds of each signature.
Two preselected web formers are provided in combination with two angle
guide means in each of two other preferred embodiments of the invention.
The two preselected web formers are of the same orientation in one
embodiment, and of opposite orientations in the other. Combined with
lead-in guide means, the two preselected web formers of the same
orientation make it possible to create two center spreads between any
desired pages, either consecutively or separately, on one side of the
centerline folds of each signature. Also combined with lead-in guide
means, the two preselected web formers of opposite orientations make it
possible to provide two center spreads between any desired pages on
opposite sides of the centerline folds of each signature.
In a further preferred embodiment of the invention there are provided three
preselected web formers in combination with as many angle guide means. One
preselected web former and one angle guide means are oriented in a
direction opposite to the orientation of the other two preselected web
formers and the other two angle guide means. Combined with lead-in guide
means, they make it possible to create two center spreads between any
desired pages, either consecutively or individually, on one side of the
centerline folds of each signature, and one other center spread between
any desired pages on the other side of the centerline folds of each
signature.
The above and other objects, features and advantages of this invention and
the manner of achieving them will become more apparent, and the invention
itself will best be understood, from a study of the following description
and attached claims, with reference had to the accompanying drawings
showing the preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagrammatic illustration of a first preferred form of web-fed
rotary printing press according to the present invention, which is
designed specifically for production of twenty-page, double-center-spread
signatures;
FIG. 2 is a section taken along the line II--II in FIG. 1 and looking in
the direction of the arrows;
FIG. 3 is an enlarged, fragmentary perspective view showing in particular
how a preselected web is turned 90 degrees in phase, folded, and
superposed with the other webs in the printing press of FIGS. 1 and 2;
FIG. 4 is an enlarged, fragmentary elevational view of the FIG. 1 printing
press, the view being explanatory of how the webs are threaded through the
machine to create an additional center spread between desired pages of
each signature;
FIGS. 5A, 5B and 5C are diagrammatic illustrations of three different
double-center-spread signature configurations producible by the FIG. 1
printing press as the webs are threaded therethrough as indicated in FIG.
4;
FIG. 6 is a diagrammatic, fragmentary top plan of a second preferred form
of rotary printing press according to the invention, which is designed for
production of double-center-spread signatures, with an additional center
spread on either side of the centerline folds of each signature;
FIG. 7 is a diagrammatic, fragmentary view of the FIG. 6 printing press as
seen in the direction of the arrow VII therein;
FIG. 8 is a view similar to FIG. 4 but explanatory of how the webs are
threaded through the FIG. 6 machine to create an additional center spread
between desired pages of each signature;
FIGS. 9A, 9B and 9C are diagrammatic illustrations of three different
double-center-spread signature configurations producible by the FIG. 6
printing press as the webs are threaded therethrough as indicated in FIG.
8;
FIG. 10 is a view similar to FIG. 1 but showing a third preferred form of
rotary printing press according to the invention, which is designed for
production of triple-center-spread signatures, with two additional center
spreads on one side only of the centerline folds of each signature;
FIG. 11 is a section taken along the line XI--XI in FIG. 10 and looking in
the direction of the arrows;
FIG. 12 is a view similar to FIG. 4 but explanatory of how the webs are
threaded through the FIG. 10 machine to create two additional center
spreads between desired pages of each signature;
FIGS. 13A, 13B and 13C are diagrammatic illustrations of three different
triple-center-spread signature configurations producible by the FIG. 10
printing press as the webs are threaded therethrough as indicated in FIG.
12;
FIG. 14 is a view similar to FIG. 2 but showing a fourth preferred form of
rotary printing press according to the invention, which is designed for
production of triple-center-spread signatures, with two additional center
spreads on both sides of the centerline folds of each signature;
FIG. 15 is a view similar to FIG. 4 but explanatory of how the webs are
threaded through the FIG. 14 machine to create two additional center
spreads between desired pages on both sides of the centerline folds of
each signature;
FIGS. 16A, 16B and 16C are diagrammatic illustrations of three different
triple-center-spread signature configurations producible by the FIG. 14
printing press as the webs are threaded therethrough as indicated in FIG.
15;
FIG. 17 is a view similar to FIG. 1 but showing a fifth preferred form of
rotary printing press according to the invention, which is designed for
production of quadruple-center-spread signatures, with two additional
center spread on one side, and one additional center spread on the other
side, of the centerline folds of each signature;
FIG. 18 is a section taken along the line XVII--XVII in FIG. 17 and looking
in the direction of the arrows;
FIG. 19 is a view similar to FIG. 4 but explanatory of how the webs are
threaded through the FIG. 17 machine to create three additional center
spreads between desired pages on both sides of the centerline folds of
each signature; and
FIGS. 20A, 20B, 20C and 20D are diagrammatic illustrations of four
different quadruple-center-spread signature configurations producible by
the FIG. 17 printing press as the webs are threaded therethrough as
indicated in FIG. 19.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will now be described as embodied by way of example
in the web-fed rotary printing press having five printing units in a row
for production of 20-page signatures each including two center spreads,
one in the usual inmost position and an additional one between two other
pages. Also, in this particular embodiment, the additional center spread
is made insertable between any two selected ones of the five sheets making
up each signature.
Diagrammatically illustrated in FIG. 1 is the rotary printing press having
five printing units 1a, 1b, 1c, 1d and 1e each having a pair of plate
cylinders PC for printing on both sides of webs Wa Wb, Wc, Wd and We as
these webs are supplied from their respective paper feeders 3a, 3b, 3c, 3d
and 3e. All the printing units 1a-1e are aligned, and all their plate
cylinders PC arranged parallel to one another. Consequently, printed by
these printing units and at least just issuing therefrom, all the webs
Wa-We travel in centerline alignment and in phase with one another,
although one of these webs must temporarily go out of alignment and out of
phase with the others in order to provide an additional center spread
according to this invention. It is understood that all the webs Wa-We
handled in this machine have each of the width equal to the longitudinal
dimension of the signatures, when they are fully unfolded, to be produced.
At 2 in FIG. 1, as well as in FIGS. 2 and 3, is shown a cutting and folding
device of conventional design including a coacting pair of folding
cylinder FC and cutting cylinder CC. These cylinders operate in a well
known manner to cut all the printed webs into individual sheets and fold
them across the middle into signatures each with two center spreads.
Since the cutting and folding device 2 is shown interposed between the
printing units 1a and 1b in the illustrated embodiment, the webs Wa and Wb
printed by these printing units are to form the outmost and inmost sheets,
respectively, of the signatures, with the web Wb providing the usual
inmost center spread in each signature. An additional center spread is to
be formed by the web We from the extreme left-hand printing unit 1e, and
inserted between the webs Wa and Wd, according to the showing of FIG. 1,
although other two webs Wc and Wd can also be each turned into a center
spread instead of the web We, as will become apparent as the description
proceeds.
As shown also in FIGS. 1-3, just upstream of the cutting and folding device
2 with respect to the arrow-marked traveling direction of the webs Wa-We,
there is conventionally provided a former 4 in the shape of a triangular
plate for folding the webs Wa, Wb, Wc and Wd along their centerlines. The
former 4 is so shaped, positioned, and oriented as to fold the webs into a
plane at right angles with the planes of the webs before being folded and
to guide the folded webs into the underlying cutting and folding device 2.
Further upstream of the former 4 there are provided means 6 for superposing
all the webs Wa-We one upon another. The superposing means 6 are shown
comprising as many guide rolls 5, all laid parallel and practically in
coplanar relationship to each other, as there are webs to be superposed.
Disposed over the superposing means 6 are means 7 required according to the
invention for longitudinally prefolding a preselected web, shown as We in
FIGS. 1-3, preparatory to superposing it with the other, unselected webs
Wa-Wd and turning it into an additional center spread in each signature.
Such means 7 includes a former 8 for folding the preselected web We, and
angle guide means 9 for guiding the preselected web to that former. This
former 8 will be hereinafter referred to as the preselected web former,
and the first recited former 4 as the unselected web former, for
contradistinction from each other.
The preselected web former 8 is oriented 90 degrees out of phase with the
unselected web former 4. Furthermore, as will be best understood from FIG.
2, the extreme tip of the preselected web former 8 lies in a vertical
plane containing the centerlines of the unselected webs Wa-Wd and the tip
of the unselected web former 4, in order that the preselected web We may
have its fold, created by the preselected web former, in register with the
centerline of the unselected webs on being superposed therewith by the
means 6.
Lying upstream of the preselected web former 8 according to a feature of
this invention, the angle guide means 9 turns the preselected web We 90
degrees out of phase with the unselected webs Wa-Wd before being folded by
the preselected web former 8. To this end the angle guide means 9 includes
a guide rod 10 angled 45 degrees to the traveling direction of the
preselected web We for giving a 90-degree turn to this web as the same is
folded thereover, and a series of guide rollers 11 for guiding the web to
the preselected web former 8 with its phase unchanged.
According to an ancillary feature of the invention there are provided
laid-in guide means 13, FIG. 1, comprising guide rollers 12a, 12b, 12c and
12d for guiding all but the preselected one of the three intermediate webs
Wc, Wd and We from their printing units 1c, 1d and 1e directly to the
superposing means 6, bypassing the prefolding means 7. Since the web We is
preselected as an additional center spread web and directed to the angle
guide means 9 in this particular embodiment, the other two intermediate
webs Wc and Wd are shown bypassing the prefolding means 7, being guided by
the rollers 12c and 12d directly to the superposing means 6. The three
intermediate webs Wc-We may be rethreaded, however, for using either web
Wc or Wd, instead of web We, as an additional center spread web, as will
be later discussed in more detail with reference to FIG. 4.
Operation
First, unwound from their stocks 3a-3e and directed through the printing
units 1a-1e, all the webs Wa-We may be threaded through the rest of the
apparatus as depicted by way of example in FIG. 1. The webs Wa and Wb may
be threaded around the extreme righthand and extreme left-hand ones,
respectively, of the five superposing rolls 5 to form the outmost and
inmost sheets of each signature to be produced. The webs Wc and Wd, to
form inside sheets of each signature, may be threaded around the lead-in
guide rollers 12c and 12d and, bypassing the prefolding means 7 which
forms additional center spreads, are then threaded around two neighboring
superposing rolls 5 next to the extreme left-hand one. To provide an
additional center spread in each signature, the web We may be folded over
the angled guide rod 10 as in FIG. 3 and directed to the preselected web
former 8 via the guide rollers 11 and thence to the remaining one
superposing roll 5 next to the extreme righthand one.
As the machine is set into operation, all the webs Wa-We will have their
opposite sides printed by the respective printing units 1a-1e. The four
unselected webs Wa-Wd, excluding the preselected web We, will be
superposed on one another in centerline alignment on traveling through the
superposing rolls 5. Then, jointly folded down their centerline by the
unselected web fo | | |
