Note: Descriptions are shown in the official language in which they were submitted.
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A STRIP SEVERING AND TRANSFER ARRANGEMENT
FIELD OF THE INVENTION
The present invention relates generally to a strip
severing and transfer arrangement for an insertion strip which
is to be threaded into a machine for manufacture or processing
of a web, such as a paper web.
BACKGROUND OF THE INVENTION
Arrangements for threading paper web into a paper
manufacturing or processing-machine are known. In view of the
large width of the paper web, it is usually impossible to
thread a paper web into the machine across the entire width of
the web. Therefore, an insertion strip is cut off the web and
is inserted into the paper manufacturing or processing
machine, which subsequently draws the entire width of the
paper web behind itself. The threading process takes place at
the start of the papèr machine or after a rupture of the web.
The strip severing and transfer arrangement can be positioned
at any random point in the paper machine. For instance, it
can be positioned at the end of the drying part or between a
calender and the paper rewinding device.
At the start of the threading process, the insertion
strip travels over the strip severing and transfer
arrangement. To begin with, the insertion strip must be
partitioned, this means it must be severed. The front end of
the insertion strip is then threaded into the paper machine
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and can then, as explained, pull the paper web behind itself.
An aspect of the arrangement is that the threading process is
performed at the full, mostly very high operating speed,
which, for instance, can be between approximately 1,500 m/min
and 2,000 m/min.
It has been observed however that the insertion
strip is not optimally guided in conventional arrangements of
the type discussed here, so that (1) in the course of the
severance no definite front edge is formed, (2) the threading
process is fraught with problems and ~3) frequently fails. In
addition, the severed strip can often not be correctly
received by the follow-on devices, so that the threading
process fails.
It is therefore an object of the invention to create
a strip severing and transfer arrangement which enables
optimal guidance of the insertion strip.
Another object of the invention is the optimal
guidance of the insertion strip so that it can be severed and
transferred to the follow-on arrangements in a defined manner
so that a faultless threading-ln process is possible at high
transfer speeds.
SUMMARY OF THE lNv~ oN
These and other objects of the invention are
achieved by a strip severing and transfer arrangement
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according to the present invention. In the arrangement, the
insertion strip is optimally guided, also at high speeds, at
the start of the threading process, without fluctuations and
lateral offset. This permits precise separation or severance.
The front edge of the insertion strip is accurately guided
during the transfer to the follow-on arrangements, be it a
guide-plate or rope shears, so that the threading process of
the fed insertion strip can be assured with a very high degree
of certainty.
In a preferred embodiment of the arrangement, the
pivot axis of the guide-plate receiving and transferring the
insertion strip is defined by an air distribution tube. This
results in compact construction of the arrangement with low
weight and a especially simple transfer of the air supplied by
an air-blow source, which is dispensed by blowers.
Furthermore, the preferred embodiment of the
invention is distinguished in that second row of blow nozzles,
which are associated with an air-distribution tube, are
associated with air guide tubes. The air-guide tubes are
disposed on the rear side of the guide plate, facing away from
the insertion strip and terminate in blast-air outlets in the
vicinity of its transfer edge. The blown air is thus carried
directly to the transfer edge of the guide plate, so that an
air-flow stabilizing the insertion strip is formed there.
Thus, the insertion strip is still accurately guided, even
after leaving the guide plate and more securely severed in the
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course of the severance process, as well as being reliably
transferred to the following guidance devices.
In a preferred embodiment of the strip severing and
transfer arrangement, the guide plate is linked to a scraper
blade support of the paper machine. This support carries a
scraper-blade, which, in the first place, serves to clean the
outer surface of the roll or a cylinder associated with the
scraper blade support during the operation of the paper
machine or to remove the web from the roll in case of web
rupture. By linking the guide plate directly with the
existing scraper blade support, optimal accessibility to the
paper machine is assured. Since the guide plate is pivotally
linked to the scraper blade support, it can be brought into an
inoperative position in which it rests completely on the
scraper blade support and occupies very little space.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood by the
Detailed Description of the Preferred Embodiment, in
connection with the drawings, wherein:
Figure 1 shows a diagrammatic side view of a strip
severing and transfer-arrangement;
Figure 2 shows a first operational position of the
arrangement shown in Figure 1;
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Figure 3 shows a second operational position of the
arrangement;
Figure 4 shows a third operational position of the
arrangement;
Figure 5 shows the strip severing and transfer
arrangement in a transfer position;
Figure 6 depicts a side view of a second embodiment
of strip severing and transfer-arrangement; and
Figure 7 depicts the strip severing and transfer-
arrangement of Figure 6 in transfer position.
DE~TTRn DESCRIPTION OF THE ~x~r~KKED
AND ALTERNATE EMBODIMENTS
Referring now to the drawings , wherein like
numerals designate like elements throughout the several views,
Figure 1 shows a side view of a strip severing and transfer
arrangement, comprising a guide plate 3, also designated as a
table plate, which is pivotally linked to a scraper blade
support 5 of a paper manufacturing or processing machine,
shown in outline. The pivot axis of the guide plate 3 is
defined by an air distribution tube 9 retained by at least one
support bracket 7, to which a gaseous medium, subjected to an
excess pressure, preferably compressed air, is fed from a
blow-air source. The scraper blade support carriers 5 has a
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conventional scraper 11, also called a scraper blade, which
helps remove the paper web from the roll 13 or a drying
cylinder of the paper machine during the threading of a paper
web into a paper machine (at the start of the same or after a
paper rupture).
During normal manufacturing process, the paper web
runs from the roll 13, directly to a paper guide roll 14 and
from it along the line 2 to a follow-up device (not shown),
for instance to a calender. During the threading process, an
insertion strip 15 is cut off from one of the two edges of the
paper web, for instance by a tip cutter (not shown) here. The
course of the insertion strip 15 is shown by a continuous
line, while the strip 15 is transferred by the arrangement 1
from the roll 13 to the follow-on arrangements of the paper
machine. As indicated by a dotted line, the insertion strip
15 is directed, to begin with, by the scraper blade 11 towards
the bottom, if the arrangement 1, is inoperative, which is
also shown by dotted lines. In this inactivated state of the
arrangement 1, the guide plate 3 is pivoted towards the
bottom, around the air distribution tube 9 serving as a pivot
axis and lies tightly at the scraper blade support 5.
The guide plate 3 is essentially V-shaped, wherein
the bend line extends vertically into the plane of the figure.
The two legs of the guide plate 3, bent in V-shape, form an
obtuse angle whose first leg is attached to the air
distribution tube 9 and whose second leg extends away from the
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air distribution tube 9, proceeding from the bend line. In
the transition region of the two legs of the guide plate 3, an
actuation arrangement, consisting of a piston-cylinder unit
17, is engaged with its first end at a bearing 18, while its
second end is fastened at the scraper blade support 5, by an
abutment support bracket 19.
In the actuated position of the piston cylinder unit
17, the piston is driven out of the cylinder so that the guide
plate 3 is brought, against the effect of gravity, into the
position shown by a continuous line in Figure 1. In the non-
actuated position, the cylinder is driven over the piston of
the piston cylinder unit 17, so that the guide plate 3 is now
located in its downwardly pivoted position, shown here by a
broken line. In the non-actuated position, the spacing A of
the first bearing 18 relative to a line 20, extending parallel
to the longitudinal axis of the piston-cylinder unit 17 and
intersecting the pivot axis of the air distribution tube 9, is
smaller than when the bearing 18 is approximately at the same
level as the air distribution tube 9. This position is
established in the transfer position of the arrangement 1
shown in Figure 4. It is assured, in this way, that the
guide plate 3, in its non-actuated position, rests closely at
the surface of the scraper blade support 5 and occupies little
space. It is possible to design the piston cylinder unit 17
to be double-acting, so that the guide plate 3 is displaced
into its non-actuated position by the force of the piston
cylinder unit 17 acting upon it. It is also conceivable, to
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obtain the non-actuated position by the action of a flexural
element which presses the guide plate 3 downwards and assures
that the piston is pushed into the cylinder of the piston
cylinder unit 17, if no working medium (for instance air) is
supplied to the piston cylinder unit 17.
The air distribution tube 9 comprises a first row of
blow nozzles 21, which are disposed along an imaginary line
extending in the direction of the air distribution tube 9 and
whose blow-out apertures are located close to the front side
of the guide plate 3, facing the insertion strip 15. The air
distribution tube 9 is provided with a second row of blow
nozzles, which discharge respectively into an air guide tube
23 and which are disposed on the rear side of the guide plate
3, facing away from the insertion strip 15. The ends of the
air distribution tube 23, facing away from the air
distribution tube 9, form blow air outlets 25 which open in
the direct vicinity of a transfer edge 27 of the guide plate
3. While the one longitudinal edge of the guide plate 3 is
attached at the air distribution tube 9, its oppositely
located longitudinal edge is configured as a transfer edge 27,
which moves along a circular line K, shown in Figure 1 by
broken lines in the course of a pivoting movement of the
guidance plate 3, with the center of the circular line K,
coinciding with the pivot axis formed by the air distribution
tube 9.
The blow air outlets 2S are disposed and oriented in
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such a way that air flowing out of them exlts along an
imaginary extension line of the guidance plate 3 and is
effective beyond its transfer edge 27.
As the air supplied by the air distribution tube 9
and exiting from the first blow air nozzles 21 flows
tangentially against the front side of the guide plate 3, the
air flow is applied to the front side and continues to flow
along the front side in the conveyance direction of the
insertion strip 15 because of the Coanda effect. A negative
pressure due to the air flow at a certain speed is generated
at the bottom side of the insertion strip 15 facing the front
side of the guide plate 3, so that the insertion strip 15 lies
on the front side of the guide plate 3 and is optimally guided
by the same. This means that no fluctuation of the insertion
strip 15 occurs. Secondly, the insertion strip 15 follows the
feed motion without any lateral offset.
It is evident from Figure 1, that the insertion
strip 15, coming from the roller 13, is transferred to the
left by the guide plate 3 and is transferred to a counter
guide plate 29, also called secondary table. In the
embodiment of the arrangement 1 shown here, the counter guide
plate 29 is pivotally supported. It can be pivoted out of an
actuated position, shown in continuous lines in ~igure 1, into
an inoperative position shown in broken lines, in which it
essentially hangs vertically downward. A feed edge 31 is
provided on the side of the counter guide plate 29, facing the
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guide plate 3, which can be formed on a flat plate fastened to
the counter guide plate 29, or be formed as an extension of
the same, as shown in broken lines. Figure 1 also shows that
the feed edge 31 can be formed by a plate 33, bent downwards
and whose bent line is perpendicular to the plane of the
drawing. The bent plate 33, forms an angle with the counter
guide plate 29, which can be smaller, equal to or larger than
90. Thus, it can also be bent towards the rear, as indicated
with a broken/dotted line in Figure 1. The transfer edge 27
also encloses, with the feed direction of the insertion strip
15, an angle equal to or smaller than 90.
The feeding edge 31 can also be configured in a
toothed manner, so that the insertion strip 15 is reliably
severed. Because of the taut guidance of the insertion strip
15 beyond the transfer edge 27, it is possible to space the
transfer edge 27, serving as a severing edge, from the feed
edge 31, so that larger tolerances are permissible and the
adjusting wor~ can be easily performed during the assembly of
the arrangement 1.
The transfer edge 27 of the guide plate 3 and the
feed edge 31 of the counter guide plate 29, form separation
elements of a cut-off arrangement designated also as a
severing arrangement. In the course of a pivoting motion of
the guide plate 3, an insertion strip 15, traveling across the
transfer edge 27 and beyond and toward the bottom, is severed
if the counter guide plate 29 is in the working position shown
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by solid lines in Figure 1.
A third blow element 35 is disposed near the feed
edge 31, through which air is directed to the top side of the
counter guide plate 29 facing the insertion strip 15. Blow
nozzle 37 of the third blow element 35, assures that the air
flows in the travel direction of the insertion strip 15 onto
the counter guide plate 29 and thus accelerates and guides the
insertion strip 15 in the travel direction.
As seen overall in Figure 1, the strip severing and
transfer arrangement 1, comprises a pivotable guide plate 3,
which cooperates with a counter guide plate 29 configured to
be pivotable in this case, but basically also fastenable in a
stationary manner. The two edges of the two plates facing one
another, namely the transfer edge 27 of the guide plate 3 and
the feed edge 31 of the counter guide plate 29, constitute a
severing or cut-off arrangement, with which an insertion strip
15, traveling beyond the transfer edge 27 is sheared off from
the bottom to the top, in the course of a pivoting movement of
the guide plate 3.
As shown in Figure 1, the scraper blade support 5
can be equipped with an additional blow device, which
comprises a fourth blow element 39 above the guide plate 3.
The fourth blow element 39 comprises a row of nozzles 41,
which blow air approximately horizontally from the right side
to the left side against the bottom side of the insertion
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strip 15, so that the insertion strip is released smoothly
from the scraper blade 11 and is transferred without forming
creases to the front side of the guide plate 3.
The fourth blow element 39 can also comprise a row
of blow nozzles (not shown) which blow air vertically towards
the top, into the wedge-shaped gap formed by the scraper blade
11 and by the insertion strip 15 which is being released.
Compressed air can also be supplied to the nozzles of the row
of nozzles 41 at the start of the pivoting motion of the guide
plate 3 (indicated in Figure 3) to insure an optimal curve
path of the insertion strip 15 and thus a secure guidance and
transfer of the paper strip from the scraper blade 11 to the
front side of the guide plate 3.
The fourth blow element 39 can be made pivotable
and to comprise only one single row of nozzles which can blow
air towards the top or on the left towards the side. The
insertion strip 15, taken off the roll 13 by the strip
severing and transfer arrangement I, is conducted further
towards the left in Figure 1 and is passed-on to additional
guidance devices. There, the insertion strip 15 is reliably
guided by the air flow exiting from the third blow element 35
or its blow nozzles 37, so that a crease-free and smooth
conveyance of the insertion strip 15 is assured.
In order to assure a guided transfer of the
insertion strip 15 by the counter guide plate 29 to another
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guidance device, the pivot axis of the counter guide plate 29
is also defined by an air distribution tube 43 which is
provided with a row of blow nozzles 45 which permit air to
exit in the conveyance direction of the insertion strip 15.
How the severed insertion strip 15, taken over by
the counter guide plate 29, is passed-on is immaterial for the
functioning of the arrangement shown here further. Instead of
the guidance devices mentioned here, which are constructed
similar to the counter guide plate 29, it is also possible to
provide rope shears which accept and move along the insertion
strip 15 coming from the arrangement 1.
The mode of operation of the strip severing and
transfer arrangement 1 will now be explained, particularity
with reference to Figures 2 through 5. When putting a paper
machine into operation and after a web ruptures, it is
necessary to pass along a paper web taken off a roll 13 to
subsequent parts of the paper machine. For this purpose, to
begin with, an edge strip, which is cut off the paper web,
constitutes the insertion strip 15.
Prior to putting the arrangement 1 into operation,
the paper web travels, together with the insertion strip 15,
under the influence of gravity from the scraper blade 11
towards the bottom. The guide plate 3 is in its non-activated
position and is in close contact with the scraper blade
support 5. The counter guidance plate 29 can already be
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actuated and is oriented in direction toward the guide plate
3.
In the functional position of the arrangement 1
shown in Figure 2, the insertion strip 15 travels without any
sort of guidance towards the bottom; it is subjected to
fluctuation and a lateral displacement of the strip is also
possible.
It is evident from Figure 3 that, to begin with,
blow air is introduced into the air distribution tube 9 for
stabilizing and guiding the insertion strip 15, so that air
from the row of the first blow nozzles 21, flows along the
front side of the guide plate 3. The already mentioned
negative pressure is generated by the air flow running in
conveyance direction of the insertion strip 15, so that the
insertion strip 15 comes into contact with the front side of
the guide plate 3 and no longer performs any fluctuations. A
lateral displacement is also excluded.
The stabilization of the insertion strip 15 occurs
also beyond the guide plate 3, thus beyond the transfer edge
27, due to the air flowing out toward the rear side of the
guide plate. The air flows out of the blow air outlets over
the transfer edge 27 in the direction of the guide plate 3.
After the insertion strip 15 has become stabilized
on the top surface of the guide plate 3, the piston cylinder
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unit 17 is activated (as indicated in Figure 4). The guide
plate 3, as shown in Figure 4, is in an intermediate position
between the inactive and the transfer or working position
shown Figure 1.
The guide plate 3 is displaced, preferably by fits
and starts, by the piston cylinder unit 17 into the transfer
position. The air flowing out of the bottom side of the guide
plate 3, keeps the paper strip taut, even beyond the transfer
edge 27 and also during the pivoting process. The insertion
strip 15 is knocked off or severed or perforated and torn-off
by cooperation of the transfer edge 27 with the feed edge 31,
thus by the severing arrangement. The new starting end of the
insertion strip 15 is received by the counter guide plate 29
and is accurately guided and passed on by the air flow exiting
from the blow nozzles 27.
As seen in Figure -5, the portion of the insertion
strip 15, severed during the pivoting motion of the guide
plate 3 which sometimes measures several hundred meters,
travels downwards, for instance into the cellar and falls off
in its entirety and no longer interferes with the transfer
process, while the new front end of the insertion strip 15,
formed by the severance process, is passed on to the counter
guide plate 29 and is guided there.
The blow nozzles 37 can be disposed in such a way on
the counter guide plate 29, that the insertion strip 15 is
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passed-on in a straight line to additional guidance devices or
is offset laterally and diverted into a rope shear which
assumes the ensuing conveyance.
The strip severing and transfer arrangements 1 can
be used everywhere, where, once a paper machine is started, a
paper web has to be threaded in. It is thus conceivable to
provide such arrangements between individual groups,
preferably at the end of a drying portion, but upstream and
within additional segments of a paper manufacturing or
processing machine.
It is particularly advantageous that the guide plate
3 can be fastened at a scraper blade support 5, thus not
requiring its own fastening or attachment provisions, which
would complicate the access to the paper machine. It is
insured by the pivotability of the guide plate 3 that service
asslgnments can be performed on the paper machine without any
interference, especially if the counter guide plate 29 is also
designed to be pivotable, the access to the arrangement 1, if
needed, is possible without any hindrance.
Because of the relatively small distance A in the
non-actuated position of the guide plate 3, it is achieved
that the piston-cylinder unit 17 moves the guide plate 3
slowly from the non-actuated position shown in Figure 2, into
the position, shown in Figure 4. Here, the distance or
spacing between the bearing 18 and the line 20 is considerably
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greater than previously, so that the guide plate 3 is now
pivoted by fits and starts past the feed edge 31 of the
counter guide plate 29 to assure reliable severing of the
insertion strip 15. A distinct spacing can remain between the
transfer edge 27 and the feed edge 31, meaning between the end
or the severance edges of the severing arrangement. Since the
insertion strip 15 is kept taut by the air flow also beyond
the transfer edge 27, the insertion strip 15 is reliably
severed upon passing the feed edge 31, serving as a severing
or tear-off edge. The free end of the insertion strip 15 is
then safely conducted to the counter guide plate 29 by the air
flow from the blast-air outlets 25 and arrives into the
guidance region of the third blow element 35 or the blow
nozzles 37.
Figures 6 and 7 show an additional embodiment of a
strip severing and transfer arrangement, which essentially
corresponds to the embodiment shown in Figure 1, wherein
identical parts are designated with the same reference
numerals. A description of these parts will therefore not be
repeated. The sole difference from the first embodiment is in
the third blow element 55 being disposed below the counter
guide plate 29. The blow nozzles 57 are herein oriented
downward, in the direction of the falling-off insertion strip.
The dotted view of the third blow element 35 in the original
position is meant to indicate, that the top blow element can
also be provided in addition to the bottom blow element 55.
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By arranging the third blow element 55 below the
guide plate 29, its function is also changed. The third flow
element 35, shown in the first embodiment, has the task of
accelerating the insertion strip 15 or to convey it further on
the guide plate.
The third blow element 55, disposed below the guide
plate 29, serves to direct an air blast to the severed portion
of the insertion strip 15, falling downward and to conduct it
reliably away from the transfer edge 27. This prevents
residual rags of the insertion strip 15 from being carried
along on the second guide plate 29. Thus, the severance
reliability can be increased.
The effect of the third blow element 55 is clarified
in Figure 7. Due to a high blow velocity, the insertion strip
15 falling towards the bottom can be pulled towards the air
flow and thus be removed from the effective range of the
second blow element 25.
While the preferred and alternate embodiments of the
invention have been shown and described in detail,
modifications and adaptations may be made thereto, without
departing form the spirit and scope of the invention, as
delineated in the appended claims.
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