U.S. patent application number 11/664689 was filed with the patent office on 2007-11-15 for cutting and transport device for webs of material.
Invention is credited to Holger Frische, Gerd Kasselmann.
Application Number | 20070261246 11/664689 |
Document ID | / |
Family ID | 35207554 |
Filed Date | 2007-11-15 |
United States Patent
Application |
20070261246 |
Kind Code |
A1 |
Kasselmann; Gerd ; et
al. |
November 15, 2007 |
Cutting and Transport Device for Webs of Material
Abstract
The invention describes a cutting and transport device for
material sheets (1) of paper or film, which comprise at least one
cutting device (7), which cuts the material sheet traversing in the
cutting or the transport device. Inventive step lies in that the
cutting and transport device (22) is provided with a sheet
reinforcement device (10), which reinforces the material sheet with
the reinforcement material (13) at the positions which are later
cut by the cutting tool (7).
Inventors: |
Kasselmann; Gerd; (Hagen
a.T.W., DE) ; Frische; Holger; (Hasbergen,
DE) |
Correspondence
Address: |
JACOBSON HOLMAN PLLC
400 SEVENTH STREET N.W.
SUITE 600
WASHINGTON
DC
20004
US
|
Family ID: |
35207554 |
Appl. No.: |
11/664689 |
Filed: |
September 16, 2005 |
PCT Filed: |
September 16, 2005 |
PCT NO: |
PCT/EP05/10000 |
371 Date: |
April 5, 2007 |
Current U.S.
Class: |
29/890.126 ;
83/83 |
Current CPC
Class: |
B65H 2301/4144 20130101;
Y10T 83/2031 20150401; Y10T 29/49416 20150115; B65H 19/26 20130101;
B65H 2301/41898 20130101 |
Class at
Publication: |
029/890.126 ;
083/083 |
International
Class: |
B65H 19/26 20060101
B65H019/26 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 5, 2004 |
DE |
10 2004 048 512.7 |
Claims
1. Cutting and transport device for material sheets (1) of paper or
film, comprising at least one cutting tool (7), which cuts the
material sheet running in the cutting or transport device (22),
characterized by a sheet reinforcement device (10), which
reinforces the material sheet (1) with reinforcement material (13)
at the places, which are later cut by the cutting tool (7).
2. Device according to claim 1, characterized by a control device,
which registers the position of the reinforcement material (13) on
the sheet (1) in the direction of the transport of the sheet (z)
and/or the time, when the reinforcement material (13) is to be
applied, as well as the velocity of the sheet between the position,
where the reinforcement material is to be applied, and the
position, where the cutting tool (7) cuts the sheet, calculates on
the basis of these values when the reinforcement material will pass
through the area of the action by the cutting tool and regulates
the cutting tool in such a manner that it cuts the sheet apart at
the reinforced place.
3. Device according to claim 1, characterized in that the sheet
reinforcement device (10) comprises the means for application of a
viscous reinforcement material.
4. Device according to claim 1, characterized in that the sheet
reinforcement device (10) comprises the means for application of a
material strip (13).
5. Device according to claim 1, characterized in that the material
reinforcement device (10) comprises an application roller (10) for
the transport of the material strip (13), which can be so
positioned that it can roll along with the material sheet (1)
during the operation and transfer the material strip (13) on the
sheet (1) during this rolling motion.
6. Method for transport and cutting of material sheets of paper or
film, in which at least one cutting tool (7) cuts a running
material sheet at the cutting points, characterized in that a sheet
reinforcement device (10) reinforces the material sheet with the
reinforcement material (13) at the places, which are later to be
cut by the cutting tool (7).
7. Method according to the preceding claim characterized in that
the sheet reinforcement device (10) reinforces the material sheet
(1) with the reinforcement material (13), which material strips
(13) have at least one self-adhesive surface.
8. Method according to claim 6, characterized in that a material
sheet (1) made of a plastic material is cut.
9. Method according to the preceding claim, characterized in that
the plastic material contains polypropylene.
10. Method according to claim 8, characterized in that the plastic
material is a stretched plastic material.
11. Device for winding running material sheets (1) on winding cores
(8,9), in which full winding cores (8) are exchangeable against
empty winding cores (9), and which exhibits the following
characteristics: one or more winding positions at which the winding
cores (8) can be linked and can be winded with the film, at least
one cutting device with a cutting tool (7), which cuts apart the
material sheet (1), if full winding cores (8) are to be exchanged
against empty winding cores (9) during operation, a winding device,
which fixes the initial part of the material sheet (1) formed by
the cutting process on a new winding core (9), characterized in
that the winding device comprises a cutting and transport device
(22) according to claim 1 can be employed with it.
12. Winding device according to the preceding claim, characterized
in that the cutting device is integrated in a material transport
roller (2-6).
13. Winding device according to the preceding claim, characterized
in that the cutting device is integrated in the last material
transport roller (6), which is located in the direction of the
transport (z) of the material sheet (1) just before the winding
core (8,9).
14. Winding device according to claim 1, characterized in that the
winding device is embodied as a turret winding device, in which the
winding process can be take place in both directions of rotation of
the last material transport roller (6), which is located in the
direction of transport (z) of the material sheet (1) just before
the winding core (8,9).
Description
[0001] Cutting and transport devices for material sheets are known.
They are mostly used in winding devices for such material sheets.
However, it is also conceivable that such cutting and transport
devices are used for cutting material sheets into smaller sheet
segments and that these shorter sheet segments are subsequently
processed further or stored using a method other than winding.
Thereby the subsequent processing can consist of, for example,
pressing, followed by separation; the subsequent storage can
consist of, for example, stacking of shorter sheet segments.
[0002] In winding devices, the sheets are in general transported by
means of a number of transport rollers. The sheets are delivered to
the winding positions in this manner. At those winding positions,
the transported sheets are winded around the winding cores till the
winding cores have the desired diameter and thus store the desired
quantity of the film. More modern winding devices are provided with
the possibility of exchanging fully winded winding cores against
empty winding cores while in operation. For that, the running
material sheet must be cut in the winding device. The beginning
part of the sheet of the cut out sheet must then be fixed on a new
winding core. To achieve that, a wide variety of methods are known.
Thus, the initial winding can take place using adhesives or
adhesive strips; however, fixing of the free initial part of the
sheet by means of vacuum or even electrostatic charge is also
known. These methods are useful both in contact winders as well as
in turret winders. In modern winders, often a reversal of the
rotational direction is possible in the last transport roller
through which the sheet traverses before reaching the sheet winder,
and despite this reversal in the rotational direction, the cutting
process and the process of the initial winding proceed without any
problem. In general this type of winders are provided with
transport cutting rollers. Within these transport cutting rollers a
knife is provided, which reaches out beyond the peripheral area of
the transport cutting roller, if the transported sheet is to be
cut. The transported sheet conveyed on the peripheral surface is
thus cut in this manner.
[0003] In the cutting and transport devices described above, as
well as obviously also in the winding devices described above, a
large variety of different types of materials are transported and
cut. Thereby, some material groups have been found to be
particularly difficult to cut. This is true on one hand for highly
fiber-containing cellulose materials. In recent times, there have
been more and more problems with the film materials. Among these
film materials, the film materials, which exhibit strong stability
in the direction of the traversal of the sheets, play a very
special role. If these materials are cut orthogonally to the
direction of the traversal of the sheet, the film frays out,
leading to completely unsatisfactory outcome of the cutting, in
which the end and the initial parts of the sheet fray out
completely. Such types of film sheets are often produced from
polypropylene or at least using polypropylene in part. These
materials are often drawn out along their longitudinal direction.
These types of stretching processes are well known to experts
familiar with the prior art. They play a role in blow film
extrusion and in the blowing of the film bubbles. In flat film
extrusion, it can result in distension, for instance, due to the
higher speed of the outfeed roller. However, often an especially
complicated stretching is involved, in which the film is cooled or
heated to a particular film temperature, and thereafter the
stretching process takes place. Of special significance are the
predefined conditions under which the stretching takes place. In
all materials, in which a high stability of the film is achieved in
the direction of the transport of the film, the fraying out
described above takes place during the cutting. This fraying out
leads to deterioration in the quality of the film, is obstructive
for the initial winding process and thus also results in
deterioration of the quality of the film roll thus produced.
[0004] Therefore the aim of the present invention is to propose a
cutting device, with which a better and neater cutting result is
obtained. This problem is solved in that a sheet reinforcement
device is provided, which reinforces the material sheet with a
reinforcing material at the positions that are later cut with the
cutting tool.
[0005] Especially in fast, automatically operated cutting and
transport devices for material sheets, it is of advantage, if the
cutting process can proceed fully automatically. For that purpose,
a steering device must be provided. With programming, it can also
be possible for such a steering device to adjust the application of
the reinforcement material on the running material sheet and the
cutting process in such a manner that the knife, or the cutting
tool, slits the material sheet exactly at the place where the
reinforcement material is applied. For that, in general, the
position of the reinforcement material on the sheet in the
direction of the transport, or the time, at which the reinforcement
material is to be applied, is registered or communicated by the
steering device. Then, if the speed of the sheet between the
position, where the reinforcement material is to be applied, and
the position, where the cutting tool is to cut the sheet, is also
known, a steering device that is programmed accordingly can steer
the knife or the cutting tool in such a manner that the sheet is
separated at the reinforced position. Naturally, the steering
device must also know the cutting place, that is, the location
within the machine, where the cutting knife is to going be
actuated. As a reinforcement material, different materials come in
question. Such materials are, among others, viscous materials like
the extrudated material and the adhesives, or hot melt as well as
material strips. The reinforcement material is preferably applied
orthogonally with respect to the direction of the run of the
material. Preferably material strips with self-adhesive layers
should be used. In the application of the reinforcement material on
a running transport sheet, it is advisable to provide an
application roller. The material strips can then, for instance, be
fed to this application roller. The application roller can then be
guided to the running sheet and can roll along with the sheet.
During this rolling process, the application roller can transfer
the material strips, preferably facing with its adhesive surface,
on the running sheet. As already mentioned, the features of the
device described above can be integrated especially with advantage
in winding devices of all types. Among such devices count the
contact as well as the turret winders. More modern winders of this
type comprise a so-called transport cutting roller, in which the
material sheet being transported on the roller is cut by a knife,
whereby the knife reaches through to the peripheral area of the
roller during the cutting movement. In high-end winders, the
movement of the transport cutting roller is reversible and initial
winding processes can be performed in both directions of the
movement of the roller. These types of winders are called "winders
with reversal of the rotational direction".
[0006] Other embodiments and details of the present invention
follow from the claims as well as the objective description.
[0007] The individual figures show:
[0008] FIG. 1 Sketch of a contact winder arranged according to the
invention
[0009] FIG. 2 Same sketch, whereby a new cutting and initial
winding process is about to take place
[0010] FIGS. 1 and 2 show a sketch of a contact winder, whereby
only the rollers and the initial winding cores involved in the
transport of the sheet, an old material roll and the sheet itself
are shown. For the sake of better overview, other components of the
winding device are not shown here. That includes the holding
devices for the roller, the machine frame and the actuators
required for the movements. Such devices are known to experts
familiar with the prior art, and they have been mentioned, for
instance, in the patent applications DE 102 02 462, DE 102 02 687,
DE 102 03 149, DE 102 02 463, DE 103 21 642, DE 103 21 599, DE 103
21 600 and DE 103 21 778.
[0011] In the figures, it is shown, how a material sheet 1 is
transported along the direction of the transport z by means of a
winding device. Thereby, it traverses by means of the transport
rollers 2, 3, 4 and 5. For the purpose of this patent application,
the last transport roller, which is passed by the material sheet
before reaching the initial winding core, is the transport roller
6, which can also be technically designated as the contact roller
in this case. This roller 6 is distinctly provided as the transport
and cutting roller, because it comprises a knife 7. This knife 7 is
so designed, that it reaches through to the external perimeter of
the roller 6 during the cutting process and thereby cuts the
transport sheet 1 apart. For the sake of simplicity, the devices
necessary for this purpose are also not shown in this application.
They have been described, for example, in the German patent
applications DE 100 51 372 and GM 94 13 238. As already mentioned,
the material sheet in FIG. 1 and FIG. 2, after it leaves the
transport cutting roller 6, is guided onto the almost complete film
roll 8 and is winded thereon further. Of special interest in
context of the present invention is the application roller 10,
which can move from position P1 to position P2 along the direction
of the arrow 12. In position P1, the application roller 10 has no
contact with the material sheet 1, and can therefore be at rest,
whereby a material strip 13 can be delivered to that roller along
its axial direction. This material strip 13 is exactly as long as
the width of the material sheet 1. In application position P2, the
application roller 10 rolls along with the material sheet 1 and
transfers the material strip 13 at the envisaged position in the
material sheet 1. Thereby, it is of advantage if self-adhesive
material strips are used. For the same reason, a roller provided
with holes for the entry and exit of air is also often employed as
an application roller. As mentioned, the shown winding device also
comprises a steering device, also not shown here. If the adhesive
strip is supplied to the roller along the axial direction of the
roller, air is often blown from the outlet holes of the roller. The
strip can thus slide on an air cushion onto the roller. As soon as
the strip reaches its position of the application on the
application roller 10, it is practical if that application strip is
fixed there. This can take place, for instance, in that the vacuum
is applied in the interior of the roller so that the strip can be
suctioned through the inlet or the outlet holes of the air. At the
time of the application of the strip on the material sheet 1, it
often serves the function of lifting off the application strip 13
from the roller by means of an air blast. Before the process of the
application, it is often convenient to set the application roller
10 into motion before it comes in contact with the material sheet
1. Thereby, the circumferential velocity of the application roller
10 can be so adjusted that it corresponds to the velocity of sheet
1. As soon as the steering control of the machine recognizes the
position for application on sheet 1 at the appropriate time, it can
regulate the rotation of the application roller in such a manner
that the application strip is delivered by the application roller
at the correct point of the sheet. It is practicable, if the roller
also touches the material sheet 1 at the appropriate time for the
application. The shown winding device is also provided with a
steering device, which is also not shown here. The steering device
knows position on the sheet where the material strip is to be
applied. This position on the material sheet 1 is designated by the
steering device as the cutting point. The path between the position
of application in the roller clearance between the application
roller 10 and the cutting point in the area of the new initial
winding core 9 is known to the steering device. Further, the
steering device can measure the rate of traversal of the material
sheet 1 between these two locations. From these two values, the
steering device calculates the time of the traversal and
accordingly coordinates the cutting movement of the knife 7 with
the application process carried out by the application roller 10.
In FIG. 1, the applied material strip is already on its way to the
location of the cutting process. The material strip 13 is between
the transport roller 3 and the transport roller 4. In FIG. 2, the
material strip 13 is already above the knife 7 on the peripheral
area of the contact roller 6. After the time indicated in FIG. 2,
the contact roller 6 moves forth in the direction of the arrow 15,
the material sheet 1 is cut apart by the knife 7 and winded on the
new winding core 9. In course of this winding process, various
other mechanisms come into play. In general, the winding process is
facilitated by an air blast from the peripheral area of the contact
roller 6. However, the material sheet 1 is often charged
electrostatically, so that it adheres to the periphery of the new
winding core 9. This type of measures that support the winding are
known in the prior art, they have already been mentioned in this
application and are, for instance, the subject matter of the
printed publications DE 102 02 462 and U.S. Pat. No. 4,852,820.
After this initial winding process, the old film roll 8 swings off
from its position, while the new film roll 9 or the new winding
core 9 is brought in that position.
[0012] To explain the present invention again, it is important that
additional material is applied directly at the cutting point in
order to reinforce it. This is especially useful in materials,
which are particularly stable in the direction of the run of the
transport sheet, as, for instance, is the case in stretched
materials or even in heavily fiber-containing cellulose materials.
Therefore, this application of the adhesive material or the
reinforcement material of any sort, such as for example, an
adhesive strip, in not meant for gluing for the process of the
winding on the new winding core 9, but solely in order to
facilitate and improve the cutting process, or improve the cuts. It
was found that without such measures, certain materials cannot be
cut at all, or that the cutting process is executed in such an
unclean manner that the subsequent winding on a new winding core 9
is thwarted. The present invention provides the remedy there.
TABLE-US-00001 List of Reference Symbols 1 Material sheet 2
Transport rollers 3 Transport rollers 4 Transport rollers 5
Transport rollers 6 Last transport roller before winding/contact
roller 7 Knife 8 Old roll 9 New winding core 10 Application roller
11 12 Arrow indicating the movement of the application roller 13
Application strip/Material strip 14 Arrow indicating the movement
of the winding core 15 Arrow in the direction of the movement of
the contact roller 16 Arrow in the direction of the movement of the
old roll 17 P1 Swiveled position of the application roller P2
Application position of the application roller z Direction of the
transport of the film sheet 1 22 Cutting and transport device
* * * * *