Note: Descriptions are shown in the official language in which they were submitted.
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CUTTING DEVICE FOR A WEB WINDER
Field of the Invention
The invention relates to a cutting device for a web winder.
The device comprises a frame construction and a cutting blade, by
means of which cutting blade the web in the reel formed on support
of the carrier drums can be cut off before new winding is started.
Backqround of the Invention
In FI Patent No. 75,788, a method and a device for winding of
a material web are described. This prior art carrier-drum winder
comprises a rear and a front carrier drum, web cutting means,
pushing means for the transfer of a complete reel from the carrier
drums, and means for feeding a new reeling spool. The cutting
means and the feeding means are operationally connected with the
pushing means so as to be displaced to their operation positions by
means of a common support arm. One end of the support arm is moun-
ted rotatably at a pivot point placed in the area of the central
axis of the real carrier drum, and the pushllly r,eans are attached
rotatably to the opposite end of the support arm so that the path
of movement of the pushing means is provided by displacing the
support arm towards the front carrier drum. The rotation of the
pushing means in relation to their support point is accomplished by
means of joint operation of the support rolls provided in the
pushing means and support faces placed at the sides of the winder.
In view of supporting and holding the web during the reel
exchange, the carrier-drum winder includes a backup holder, which
is pushed to project between the carrier drums and which holds the
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web against the rear carrier drum. The cutting means include a
member for cutting off the web by means of a stroke-like movement
of the cutting blade. The stroke-like movement is directed at the
area of the tip of the backup holder, towards the web portion
placed between and is held tight by the tip and the pushing means.
A drawback of the web cutting device disclosed in FI Patent N.
75,788 is that a large number of beams are required for which
reason the frame construction of the cutting device is complicated
and heavy.
In publication DE 2,920,707, a combined web holder and cutting
device is described, which is fitted underneath the carrier- drum
winder. This arrangement requires that a recess must be made into
the floor of the production plant for the frame of the cutting
device. Thus, this solution requires an abundance of space under-
neath the carrier-drum winder. The cutting proper of the web takes
place by displacing the blade of the cutting device.
Summary of the Invention
In view of the above, an object of the present invention is to
provide an improvement over the prior art web cutting devices.
More particuldrly ~ it is an obJ ect of the in~ention ~o p-r-o-vide
a cutting device which does not require an installation pit in the
floor of the production plant.
A further object of the invention is to provide a cutting de-
vice which can be attached to the frame of any carrier-drum winder
whatsoever.
These objects and others are achieved in the present invention
by means of a cutting device whlch comprises a cutting blade, an
actuator and power transfer members which are operationally con-
nected with the cutting blade so that the movement of the actuator
is transferred by an intermediate of said power transfer members to
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the cutting blade. The cutting blade moves along a curved path of
movement so that a lower position of the cutting blade is substan-
tially more distant from an associated carrier drum than in an
upper position of the cutting blade.
By means of the cutting device in accordance with the inven-
tion, a number of remarkable and unexpected advantages are ob-
tained. By means of the cutting device of the present invention,
it is unnecessary to make an installation pit for the frame
construction of the cutting device in the floor of the production
plant. The cutting device can be attached to the frame of any
carrier-drum winder whatsoever. The cutting blade of the cutting
device can be passed into the gap between the carrier rolls either
from below, from the front, from the rear, or from above. Further-
more, it is easily possible to attach other auxiliary devices to
the cutting device, that are necessary for carrying out the reel
exchange. Such auxiliary devices are, for example, a blow device
for holding the end of the cut-off web, a web holding device, and a
threading member, etc.
B~IEF DESCKI2TIGN GF THr ~RA-wINGS
The following drawings are illustrative of embodiments of the
present invention and are not meant to limit the scope of the
invention as encompassed by the claims.
Figure 1 is a side view of a preferred embodiment of a
cutting device in accordance with the invention.
Figure 2 is a side view of a second preferred embodiment of a
cutting device in accordance with the invention.
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Figure 3 is a side view of a third preferred embodiment of a
cutting device in accordance with the invention.
Figure 4 is a side view of a fourth preferred embodiment of a
cutting device in accordance with the invention.
Figure 5 is a side view of a fifth preferred embodiment of a
cutting device in accordance with the invention.
DETAILED DESCRIPTION
In the embodiment shown in Fig. 1, the cutting device in
accordance with the invention denoted generally with the reference
numeral 10. The cutting device 10 comprises a frame 11, a syn-
chronization tube 12, first arms 13 that are fitted pivotally,
second arms 14 that are fitted pivotally, a cutting-blade frame 15
and a cutting blade 16, as well as an actuator 17. The frame tube,
which is a part of the frame 11, is denoted with the reference
numeral lla. The frame tube lla passes in a transverse direction
through the carrier-drum winder to an opposite side. In the
e-mbodiment shown in rig. l, the cutting device lû is appiied in a
carrier-drum winder which comprises a conventional carrier drum 18
as well as a carrier drum 19 consisting of a roll l9a and of
another roll, not shown, and of a belt l9b. The reel is denoted
with the reference numeral 2û.
In the embodiment shown in Fig. l, the cutting blade 16 of the
cutting device lû is passed into the gap between the carrier drums
18 and 19 from below. The cutting device lû is attached to the
frame construction.
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The cutting device 10 shown in Fig. 1 operates as follows. The
movement of the actuator 17, e.g. a hydraulic cylinder, acts upon
the first arms 13, which are linked with the second arms 14. The
pivoting movement of the arms 13 is synchronized by means of the
synchronization tube 12. The frame 15 of the cutting blade 16 is
linked with the second arms 14. The movement of the actuator 17 is
transferred to the frame 15 by the intermediate of the arms 13 and
14, whereby the frame 15 of the cutting blade and the cutting blade
16, which is attached to the frame, obtain a curved movement of
rotation in relation to the face of the carrier drum 18. This cur-
ved movement of rotation has been chosen so that the center of
rotation of the cutting blade 16 is separate from the center of
rotation of the carrier drum 18. The center of rotation of the
blade 16 can be chosen fully freely, provided that the center of
rotation of the blade 16 does not coincide with the center of
rotation of the carrier-drum 18.
In Fig. 1, the dashed lines indicate the lower position of the
cutting blade 16 and, in a corresponding way, the full lines
indicate the upper position. It is readily apparent from Fig. 1
that ill its iOW~l positivl., ~h~ cut.in~ blad~ i6 is piac~d a~ a
certain distance from the face of the carrier drum 18, and in its
upper position the cutting blade 16 is placed very close to the
face of the carrier drum 18.
The cutting proper of the web takes place, e.g., merely
because the blade 16 is sharp enough to pass through the web that
is placed tensioned on the reel 20. The cutting of the web placed
on the reel 20 may also take place so that the reel 20 is pushed by
means of a pushing device in itself known, in which case the ten-
sioned web forms a sufficient angle in relation to the cutting
blade 16, whereby the web is cut off.
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The embodiment shown in Fig. 2 illustrates the passing of the
cutting device 10 in accordance with the invention into the gap
between the carrier drums 18 and 19 from the side, or, as depicted
in the present embodiment from the rear. In this embodiment, the
carrier-drum winder comprises conventional carrier drums 18 and 19.
In the embodiment shown in Fig. 3, the passing of the cutting
device 10 takes place similarly to Fig. 1, i.e., from below. In
this embodiment, the carrier-drum winder is composed of conven-
tional carrier drums 18 and 19. Further, in this embodiment, the
cutting device 10 is provided with a blow device 21.
The embodiment shown in Fig. 4 is similar to the embodiment
shown in Fig. 1, except that the cutting device 10 shown in Fig. 4
is provided both with a blow device 21 and with a web holder 22.
Fig. 5 shows an embodiment which is in the other respects
similar to the embodiment shown in Fig. 1 except that, in the
embodiment shown in Fig. 5, the cutting device 10 is provided both
with a blow device 21 and with a web threading member 23.
The cutting device 10 in accordance with the invention ope-
rates during normal winding and during reel exchanges as follows.
During nGr mal -,ur,ning, the blade i6 has beerl run d~wn ~o a iower
position so that there is a sufficient space underneath the carrier
drum 18. To run the new web upon cutting apart of the complete
reel 20, the threading member 23 is placed underneath the carrier
drum 18, and the cutting blade 16 of the cutting device 10 is run
to its extreme upper position.
In the embodiment shown in Fig. 1, the cutting blade 16 has
moved to its extreme upper position through the gap between the
carrier drums 18 and 19, in which case it is possible to carry out
conventional cutting-off of the web. The cut-off end of the web
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can be held in its position, e.g., by means of a blow device 21
shown in Figs. 3 and 4. To start new winding, the cutting blade 16
is moved slightly down to permit fitting of a new spool into the
gap between the carrier drums 18 and 19.
As the reel exchange constitutes prior art, it will not be
described in further detail in connection with the invention dis-
closed in the present application. However, it should be nGted
that the cutting device 10 in accordance with the invention permits
a very smooth and fluent exchange of reel.
Many other variations of the present invention would be
obvious to one skilled in the art, and are contemplated to be
within the scope of the appended claims.
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