U.S. patent application number 11/688137 was filed with the patent office on 2007-10-11 for method for the cutting of paper products.
Invention is credited to Ronald Meisel.
Application Number | 20070238396 11/688137 |
Document ID | / |
Family ID | 37808317 |
Filed Date | 2007-10-11 |
United States Patent
Application |
20070238396 |
Kind Code |
A1 |
Meisel; Ronald |
October 11, 2007 |
Method for the Cutting of Paper Products
Abstract
In a method for the cutting of paper products, the paper
products are trimmed at at least one side in a cutting apparatus
and are subsequently ground.
Inventors: |
Meisel; Ronald; (Kochel am
See, DE) |
Correspondence
Address: |
FITCH EVEN TABIN AND FLANNERY
120 SOUTH LA SALLE STREET
SUITE 1600
CHICAGO
IL
60603-3406
US
|
Family ID: |
37808317 |
Appl. No.: |
11/688137 |
Filed: |
March 19, 2007 |
Current U.S.
Class: |
451/28 ;
451/285 |
Current CPC
Class: |
B24B 9/18 20130101; B26D
7/27 20130101; B24B 19/223 20130101; B24B 55/06 20130101 |
Class at
Publication: |
451/028 ;
451/285 |
International
Class: |
B24B 1/00 20060101
B24B001/00; B24B 29/00 20060101 B24B029/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 22, 2006 |
DE |
10 2006 013 221.1 |
Claims
1. A method for the cutting of paper products, comprising: trimming
the paper products at at least one side in a cutting apparatus; and
grinding the at least one side of the paper products following the
trimming in order to refine a trim surface of the at least one
side.
2. A method in accordance with claim 1, wherein the paper products
are held continuously in a pressed together state at the start of
the trimming up to the end of the grinding.
3. A method in accordance with claim 1, wherein the paper products
are conveyed during the grinding.
4. A method in accordance with claim 1, wherein the paper products
are ground using a grinding wheel, which is oriented slightly
obliquely to the at least one side.
5. A method in accordance with claim 1, wherein an extraction of
grinding dust takes place during the grinding.
6. A grinding apparatus, comprising: a conveying device (10, 11),
with which paper products (P) can be transported along a conveying
path; a pressing device (12, 14), which is provided in a region of
the conveying path and with which the conveyed paper products (P)
are pressed together at at least one side during transport; and a
grinding device (20) that is provided in a region of the pressing
device (12, 14) and with which the paper products (P) are ground in
a region of the at least one side.
7. A grinding apparatus in accordance with claim 6, wherein the
grinding device (20) has a grinding wheel (22), which is orientated
slightly obliquely to the conveying path.
8. A grinding apparatus in accordance with claim 6, wherein the
grinding device (20) has a grinding wheel (22), which can be
adjusted in a direction of the paper product (P) to be ground, in
particular by means of a spring.
9. A grinding apparatus in accordance with claim 6, wherein the
grinding device (20) has at least two grinding wheels (22), which
are mounted on a changing device.
10. A grinding apparatus in accordance with claim 6, wherein a
cutting device is provided in a conveying direction in front of the
grinding device (20) and the paper products (P) are trimmed by the
cutting device in the region of the pressed together side.
11. A grinding apparatus in accordance with claim 6, wherein a
protective housing is provided, which prevents a spreading of
grinding dust.
12. A grinding tool for a grinding apparatus in accordance with
claim 6, comprising: a grinding disk (26), on which a grinding
wheel (22) provided with holes is fastened by means of a clamping
ring (24), with a plurality of elongate passages (27) being
provided in the grinding disk (26), through which an extraction of
grinding dust can take place.
13. A grinding tool in accordance with claim 12, wherein the
passages (27) are curved in a plan view and extend from a radially
inner end (A) to a radially outer end (B).
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of German Patent
Application No. 10 2006 013 221.1, filed Mar. 22, 2006. The
disclosure of the above application is incorporated herein by
reference.
FIELD
[0002] The present invention relates to a method for the cutting of
paper products, wherein the paper products are trimmed at at least
one side in a cutting apparatus.
BACKGROUND
[0003] The statements in this section merely provide background
information related to the present disclosure and may not
constitute prior art.
[0004] A cutting process of the above-described type is generally
known from the prior art and serves, for example, to trim the paper
products coming from a printing machine at, for example, three
sides to the desired format. The side trimming is carried out, for
example, with rotary cutting knives which are fitted with
individual blades and carry out the trimming against a counter
knife. Cutting processes are also known, wherein two rotary cutting
knives meshing with one another are used to cut the paper
products.
[0005] Although the known cutting processes have proven themselves,
the problem can occur when using rotary cutting knives as the
cutting means, in particular on the cutting of very thick paper
products such as catalogs, telephone books or the like, that the
trimmed side of the paper product does not have the desired surface
property due to cutting tracks.
SUMMARY
[0006] It is the object of the invention to provide a method for
the cutting of paper products with which in particular thick paper
products can be cut using rotary cutting knives such that a cut
surface is created which is free of cutting tracks.
[0007] This object is satisfied in that, following the side
trimming, the previously trimmed side of the paper products is
ground to refine the cut surface. In accordance with the invention,
a grinding process takes place following the cutting process in
which the previously trimmed side of the paper products is
initially ground only by so much until any cutting tracks still
present are removed, for example by approximately 1/10 mm. Very
thick paper products such as telephone books or the like can also
be cut to a desired format by the cutting process in accordance
with the invention using rotary cutting knives, with the products
resulting from the process having an extremely uniform cut surface
which is free of any cutting tracks.
[0008] The method in accordance with the invention is suitable for
any type of paper products, for example magazines, stacks of
magazines, catalogs, telephone books or also pressed or bundled
stacks of single sheets.
[0009] Advantageous embodiments of the invention are described in
the description, in the drawings and in the dependent claims.
[0010] In accordance with a first advantageous embodiment, the
paper products are held in a pressed together state at the start of
the cutting up to the end of the grinding, i.e. the paper products
are pressed together continuously during cutting and grinding at
least at the side at which they were previously trimmed. The
pressing together can take place in an advantageous manner with the
help of pressing bands which are already present on the cutting
apparatus. An extremely high quality of the ground surface results
from the grinding of the product sides in the pressed state, with
the products not being able to be reorientated between cutting and
grinding.
[0011] In accordance with a further embodiment of the invention,
the paper products can be conveyed during the cutting. A relative
movement between the product to be ground and the grinding device
used hereby results during the grinding process, which increases
the uniformity of the grinding, but also the processing speed. This
can also be achieved in that the cutting and grinding devices are
moved relative to the product.
[0012] In accordance with a further advantageous embodiment of the
invention, the paper products are ground using a grinding wheel
which is oriented slightly obliquely to the previously trimmed side
of the paper product. It is ensured with this embodiment that the
paper product can be moved into the grinding device without problem
since the grinding wheel forms a conical inlet for the paper
product due to its slightly oblique orientation.
[0013] It can be advantageous due to the fineness of the paper dust
arising for an extraction of grinding dust to take place during the
grinding.
[0014] In accordance with a further aspect of the invention, this
relates to a grinding apparatus comprising a conveying device with
which paper products can be transported along a conveying path,
with a pressing device being provided in the region of the
conveying path with which the conveyed paper products are pressed
together at at least one side during the transport. In accordance
with the invention, a grinding device is provided in the region of
the pressing device with which the paper products are ground in the
region of the pressed together side.
[0015] Previously trimmed paper products can be ground off at their
cut surface using the continuous grinding device in accordance with
the invention such that a surface property is created which is free
of grinding tracks. In this connection, it can be ensured with the
help of the pressing device that the paper products, and also the
individual sides of the paper products, are not displaced during
the grinding process.
[0016] In accordance with an advantageous embodiment, the grinding
device can have a grinding wheel which is oriented slightly
obliquely to the conveying path so that it is ensured that the
paper products can move securely into the grinding apparatus.
[0017] In accordance with a further advantageous embodiment, the
grinding device has a grinding wheel which can be adjusted in the
direction of the paper product to be ground, for example with the
help of a spring, a motor, a positioning cylinder or the like. It
is hereby ensured that no canting can occur on the moving of the
paper product into the grinding device. At the same time, the depth
of the grind can be influenced by the surface pressure and the
pressing time.
[0018] In accordance with a further advantageous embodiment, the
grinding device has at least two grinding wheels which are mounted
on a changing device. The changing device can, for example, have a
rotatable support on which the at least two grinding wheels are
mounted so that, by rotation of the carrier, one of the grinding
wheels can be brought into its working position and the other
grinding wheel can be replaced and/or cleaned.
[0019] In accordance with a further advantageous embodiment, a
cutting device is provided in front of the grinding device in the
conveying direction with which the paper products are trimmed in
the region of the pressed together side. In this embodiment, the
grinding apparatus can simultaneously be used to carry out the edge
trimming.
[0020] In accordance with a further advantageous embodiment, the
grinding apparatus has a protective housing which prevents a
spreading of grinding dust. The protective housing can be provided
with a dust extraction.
[0021] In accordance with a further aspect of the present
invention, this relates to a grinding tool for the carrying out of
the method in accordance with the invention, with the grinding tool
having a grinding disk on which a grinding wheel provided with
holes is fastened by means of a clamping ring, with a plurality of
elongate passages being provided in the grinding disk via which an
extraction of grinding dust can take place.
[0022] Such a grinding tool is particularly suitable for the
grinding of previously trimmed paper products since the grinding
wheel can be replaced easily with the help of the clamping ring.
Furthermore, generally known holes are provided in the grinding
wheel so that extraction can take place through the grinding wheel.
Due to the elongate passages in the grinding disk, a large-area
extraction of the grinding dust is possible so that the spread of
dust is minimized overall.
[0023] In accordance with a further advantageous embodiment, the
passages can be curved in a plan view and can extend from a
radially inner end to a radially outer end. In this manner, the
rotation of the grinding wheel can also advantageously be used to
convey the grinding dust arising within the passages with an
elongate curve and, depending on the direction of rotation, to the
radially inner end or to the radially outer end of the
passages.
[0024] Further areas of applicability will become apparent from the
description provided herein. It should be understood that the
description and specific examples are intended for purposes of
illustration only and are not intended to limit the scope of the
present disclosure.
DRAWINGS
[0025] The drawings described herein are for illustration purposes
only and are not intended to limit the scope of the present
disclosure in any way.
[0026] FIG. 1 is a sectional view of a grinding apparatus; and
[0027] FIG. 2 is a plan view of the grinding disk of the grinding
apparatus of FIG. 1.
DETAILED DESCRIPTION
[0028] The following description is merely exemplary in nature and
is not intended to limit the present disclosure, application, or
uses. It should be understood that throughout the drawings,
corresponding reference numerals indicate like or corresponding
parts and features.
[0029] FIG. 1 shows a section through a grinding apparatus which
has a conveying device in the form of a belt pair 10, 11 which is
driven by a drive device, not shown, and between which paper
products P, for example telephone books or the like, can be
transported along a conveying path. A pinch roller 12 and 14 is
respectively provided beneath the lower transport belt 10 and above
the upper transport belt 11 and is pressed in the direction of the
paper product P via means which are not shown. The two pinch
rollers 12 and 14 form a pressing device with which a side of the
paper product P can be pressed together during the transport along
the conveying path.
[0030] Furthermore, FIG. 1 shows a grinding device 20 which is
provided in the region of the pressing device 12, 14 and with which
the paper products P can be ground in the region of the pressed
together product side. For this purpose, the grinding device 20 has
a grinding wheel 22 which is shown by broken lines in FIG. 1 and
which is clamped with the help of a clamping ring 24 to a grinding
disk 26 which is screwed by means of screws 23 to a shaft 28 which
can be driven via a motor which is not shown. The shaft 28 is
supported on a base body 30 which can be moved on a carriage 34
with the help of an adjustment drive 32 such that the grinding
wheel 22 can be positioned in the direction of the paper product P.
A spindle 33 is set into rotation by actuating the adjustment drive
32 and in turns moves the base body 30 to the right or to the left
in the vertical direction in FIG. 1. A control is provided in this
process which always positions the grinding wheel 22 by a spacing
of approximately 1/10 mm in the direction of the paper product P
when the latter has passed the outer periphery of the grinding
wheel 22 and is transported past the grinding wheel. The carriage
34 can subsequently be moved back again.
[0031] FIG. 2 shows a plan view of the grinding disk 26 of FIG. 1.
As can be recognized, a total of twelve elongate passages 27 are
provided in the grinding disk 26 in the embodiment shown which are
each open toward the front side and rear side of the grinding disk
26 and through which an extraction of grinding dust can take place.
The passages 27 are curved in a plan view and extend from a
radially inner end A to a radially outer end B.
[0032] As FIG. 1 illustrates, the grinding disk 26 is connected via
screws 25, which clamp the clamping ring, to an intermediate ring
29 in which a ring-shaped extraction passage 40 is provided which
opens into a connected passage 42 for extraction. The intermediate
ring seals with respect to components 36 and 38 fixed to the
housing via a seal which is not shown and is accepted in a ring
groove 44.
[0033] Since the grinding wheel 22 is provided with holes, the
paper dust which arises during grinding can be extracted through
the holes of the grinding wheel. For this purpose, underpressure is
applied to the connected passage 42 so that the grinding dust moves
through the holes of the grinding wheel 22 first into the elongate
passages 27 of the grinding disk 26 and from there into the
ring-shaped extraction passage 40 of the intermediate ring 29
before it is sucked into the connected passage 42. Since the
grinding wheel 22 or the grinding disk 26 in FIG. 2 rotate counter
clockwise, this rotary movement supports the transporting of the
paper dust within the passages 27 in the direction of the outer end
B. This contributes to a more uniform transporting away of the
arising grinding dust being able to take place.
[0034] Alternatively, a dust extraction can also take place via a
hollow shaft, with in this case the inner ends A of the passages 27
being guided into the interior of the hollow shaft and the
direction of rotation of the grinding wheel being reversed.
[0035] Furthermore, the described grinding apparatus can be
provided in a protective housing which additionally prevents a
spreading of grinding dust.
[0036] The grinding apparatus in accordance with the invention, or
the grinding device 30, is preferably integrated into a rotary
cutting machine such as has been disclosed in German patent
application 10 2005 001 471 of Jan. 12, 2005. The disclosure of
this patent application is explicitly included by reference in the
content of the present application.
[0037] In rotary cutting apparatus of this type, two rotary cutting
knives meshing with one another are provided, with the paper
products being pressed and guided between an upper and a lower
transport belt. If the grinding device 30 in accordance with the
invention is integrated into such a cutting apparatus, it can be
advantageous to incline the grinding wheel 22 in FIG. 1 slightly
around a vertical axis so that the grinding plane extends at a
small acute angle to the previously trimmed side of the paper
product P to form a product inlet.
[0038] In the method in accordance with the invention for the
cutting and grinding of paper products, the individual paper
products are trimmed at at least one side in a cutting apparatus
such as is disclosed in the previously named German patent
application 10 2005 001 471. After the trimming, the trimmed side
remains held inside the pressing device and the paper product is
led past the grinding apparatus 20 with the help of the conveyor
belts 10, 11 such that, following the side trimming, the previously
trimmed side can be ground to refine the cut surface. In this
connection, the actuating motor 32 is controlled such that the
grinding wheel 22 is briefly set on the paper product P led past.
The paper product P is therefore both held in a pressed together
state during the grinding and conveyed in the conveying direction
during the grinding. At the same time, an extraction of the
grinding dust through the previously described passages 27, 40 and
42 takes place during the grinding.
[0039] The description of the invention is merely exemplary in
nature and, thus, variations that do not depart from the gist of
the invention are intended to be within the scope of the invention.
Such variations are not to be regarded as a departure from the
spirit and scope of the invention.
* * * * *