EP2070666B1 - String cutting device - Google Patents

Abstract

The device has a rotary blade (11) and a counter blade cooperating with one another, where a base of the counter blade is immovable. The rotary blade is arranged at a blade roller (15). A working area of the rotary blade is provided with the counter blade. The counter blade runs at a cutting edge (14) of the rotary blade during rotation of the rotary blade in a longitudinal axial direction. The cutting edge of the rotary blade and/or a cutting edge of the counter blade is arranged in an oblique manner to a rotational axis (17) of the blade roller.

Description

The invention relates to a strand cutting device of the tobacco processing industry with a rotating knife and a counter knife, which cooperate with each other.

A corresponding strand cutting device is for example from the DE 10 2005 062 644 A1 known. From this, in particular, a cutting device is known, in which a rotating-moving cutting body is provided with a cutting edge, wherein the cutting body is arranged on a first rotary body having an axis of rotation. The cutting body is arranged substantially parallel to the axis of rotation of the first rotating body.

In addition, it is provided in a further variant to provide two second rotation body, by means of which strand material between the two second bodies of rotation retractable and then can be removed. If after commissioning a filter rod machine the standard speed has been reached, the filter strand is cut off by means of the cutting body arranged on the first rotary body. The strand produced before standard speed is carried away by two rollers.

Out EP 0 286 828 B1 there is known a device for deflecting and breaking a continuous cigarette rod in a cigarette manufacturing machine, wherein a bar breaking device is provided which serves to break a rod which has been deflected by a deflecting part. Here, a kind of rotating propeller is provided, which serves as a rotating cutting mechanism in the EP 0 286 828 B1 is designated. The cutting device from the EP 0 286 828 B1 , which may also be referred to as a breaking device, damages the components of the cigarette rod or cigarette rod relatively clearly. It can also wrap paper shreds arise. These are undesirable in the recycling of the shot tobacco.

DE 37 43 530 A1 discloses a cross cutter for severing blanks from a web of material. It is provided a fixed lower blade and a circumferential upper blade. Both knives are inclined relative to one another or to the material web, so that their knife edges are V-shaped relative to each other and extend with a component in or against the conveying direction and with a component perpendicular to the conveying direction of the material web. During the cut, a kind of pulling cut occurs relative to the fixed knife.

US 3,203,292 A. discloses a cutting device for a longitudinally axially moving web in the transverse direction to this web, wherein the cutting device is designed rotatable and wherein the axes of the rotary cutting device and the rotating counter knife have an angle to each other.

US 3,733,949 A discloses a perforating device and a cutting device. In this case, corresponding tracks are cut by means of a rotating cutting element whose cutting edge is arranged at an angle to the axis of rotation.

BE 663 042 A discloses a cutting device which is rotatably formed, wherein a cutting edge is arranged at an acute angle to the axis of rotation.

DE 40 15 025 A1 discloses a cutting device for a belt of a confectioning machine having two counter-rotating rollers with parallel axes, the corresponding blades of respective rollers being provided in the manner of a scissors-like means for cutting portions of a belt.

DE 103 06 664 A1 discloses a holding device for a pressure bar of a cylinder for a roller printing machine, wherein the pressure bar is used for cutting or folding paper webs. It is an object of the present invention to provide a strand cutting device which enables a cutting of the strand in a gentle manner, with a correspondingly smooth cut should be possible.

This object is achieved by a strand cutting device of the tobacco processing industry with a rotating knife and a counter knife, which cooperate with each other, wherein an effective range of the knife is provided with the counter knife, which runs in rotation of the knife in the longitudinal axial direction at a cutting edge of the knife provided a knife roller is, on which the rotary knife is arranged, wherein the knife roller has at least one groove, which cooperates with a strand such that the strand is conveyed and / or comminuted, wherein the at least one groove has a sharp outer edge, wherein the outer edge between two Grooves is arranged, wherein the two surfaces which form the outer edge, are arranged at an angle β to each other, which is pointed. By this measure according to the invention results in a kind of shear cut, which allows a very clean and smooth cut. This makes it possible that no scraps of paper arise that complicate the reuse of the strand material.

Preferably, a base of the counter knife is fixed. The base of the counter knife is a region of the counter knife, which is remote from the cutting edge of the counter knife. As a result, very precise and material-saving cuts are possible.

According to the invention, a knife roller is provided on which the rotating knife is arranged. By this measure, a very uniform cut can be ensured. Preferably, a cutting edge of the rotating blade and / or a cutting edge of the counter blade is arranged obliquely to a rotation axis of the knife roller. In particular, preferably a hyperboloidal shear cut is thereby made possible. The oblique arrangement is thus preferably not only in a direction oblique to the axis of rotation of the knife roller, but also in a direction perpendicular thereto. In a horizontal orientation of the knife roller is thus the cutting edge of the rotating Knife and / or the cutting edge of the counter knife arranged both in the horizontal direction obliquely to the rotational axis of the knife roller and in the vertical direction obliquely to the rotational axis of the knife roller. The angle between the cutting edge and the axis of rotation of the knife roller is preferably between 1 ° and 9 °, in particular preferably at 5 °.

A good result can be achieved if the counter knife is flexible. In this way, in particular blockages or stagnations can be prevented.

A particularly simple positioning of the rotating blade is possible if this is positioned by means of an eccentric device. Accordingly, a very simple and accurate positioning of the counter knife is possible when this is positioned by means of an eccentric device.

A strand cutting device according to the invention is designed such that the knife roller has at least one groove which cooperates with a strand such that the strand is conveyed and / or comminuted. For this purpose, the at least one groove has a, in particular sharp, outer edge. Under sharp outer edge is to be understood in the context of the invention, in particular a discontinuity jump in the slope of the surfaces which form the edge. The at least one groove preferably extends longitudinally axially over substantially the entire width of the knife roller.

According to the invention two grooves are provided, which are adjacent, wherein between the two grooves, the outer edge is arranged. Preferably, the two surfaces forming the outer edge are at an angle to each other which is pointed.

Preferably, the rotating blade rotates at a rotational speed at least as great as the strand velocity. In this way, it can not lead in particular to a jam of the discharged strand or the cut strand parts.

Preferably, at least one guide element is provided which guides a strand to the rotating blade.

Fig. 1

eine schematische dreidimensionale Darstellung einer erfindungsgemäßen Messerwalze teilweise in einer ex- plodierten Darstellung,

Fig. 2

eine schematische Darstellung der erfindungsgemäßen Strangschneidvorrichtung in teilweise explodierter Dar- stellung,

Fig. 3

eine schematische Darstellung der erfindungsgemäßen Strangschneidvorrichtung aus Fig. 2 in zusammenge- setzter Darstellung,

Fig. 4

eine schematische Schnittdarstellung eines Teils einer erfindungsgemäßen Strangschneidvorrichtung von mi- teinander wirkenden Messern,

Fig. 5

eine schematische Schnittdarstellung eines Teils einer erfindungsgemäßen Strangschneidvorrichtung in ver- schiedenen Positionen mit verschiedenen Drehwinkeln.

The invention will hereinafter be understood without limitation of the general The invention is described with reference to exemplary embodiments with reference to the drawings, reference being expressly made to the drawings with regard to all details of the invention which are not explained in greater detail in the text. Show it:

Fig. 1

a schematic three-dimensional representation of a knife roller according to the invention, partly in an exploded view,

Fig. 2

1 is a schematic representation of the strand cutting device according to the invention in a partially exploded view,

Fig. 3

a schematic representation of the strand cutting device according to the invention Fig. 2 in a composite representation,

Fig. 4

1 is a schematic sectional view of a part of a strand cutting device according to the invention of mating knives;

Fig. 5

a schematic sectional view of a portion of a strand cutting device according to the invention in various positions with different angles of rotation.

In the following figures, identical or similar elements or corresponding parts are provided with the same reference numerals, so that a corresponding renewed idea is dispensed with.

Fig. 1 schematically shows a three-dimensional exploded view of a knife roller 15 according to the invention a strand cutting device 10, which is schematically in the Figures 2 and 3 is shown with the essential elements. For better representability because was in Fig. 1 an exploded representation chosen.

The knife roller 15 comprises two rotating blades 11, 11 ', which are inserted in a respective corresponding groove 32, 32' of the knife roller 15. In the context of the invention, the rotating blades 11, 11 'attached to a rotary body, in this embodiment, the knife roller 15, and rotate with the knife roller 15, however, are fixed relative to the knife roller 15. A stabilization device 30, 30 'serves to stably mount the rotating blades 11, 11' in the respective groove 32, 32 '. For positioning or adjustment of the knives 11, 11 'are screws 18, 21 and eccentric screws 19 and 20, which partially cooperate with oblong holes in the knives 11, 11' and the stabilizer 30, 30 'and against a respective nut 31, 31' to be fixed.

The knives 11 and 11 'are in this embodiment on the one hand due to the orientation of the groove 32, 32' in the knife roller 15 is arranged vertically obliquely to the axis of rotation 17. By the eccentric screws 19 and 20, a horizontal oblique arrangement can be provided relative to the axis of rotation 17 of the knife roller 15.

The cutting edge 14, 14 'of the knives 11 and 11' is also in accordance with Fig. 1 to recognize. In addition, it can be seen that on the body of the knife roller 15 further grooves 23, 24 and 25 and 26 are provided which define relatively sharp edges 33, 34, 35 and 36. The sharp edges are formed by two respective adjacent surfaces of adjacent grooves, these surfaces having an angle β which is acute, preferably in one region between 15 ° and 60 °, more preferably in a range between 30 ° and 50 °. The edge 35 is defined by the intersection of a surface or wall of the groove 36 and an outer surface of the knife roller 15. The edges, which are defined by the grooves or surfaces of the knife roller 15, serve for conveying a filter strand or cigarette rod or several strands and possibly also for comminuting or pre-comminuting. For better illustration, the direction of rotation in Fig. 1 represented and provided with reference numeral 40.

In Fig. 2 a strand cutting device 10 according to the invention is shown schematically in three-dimensional representation in partially exploded representation. The knife roller 15 has the mounted blades 11 and 11 '. There are provided correspondingly some walls that can be connected to each other via pins 30 and screws 29, as this is indicated by the dashed lines.

There are also guide elements 41, 42 and 43 are provided, wherein the guide element 43 is integrated in the wall. The guide elements 41, 42 and 43 serve to promote strand material in the direction of the knife roller 15 and the knife 12 with its cutting edge 16. To drive a drive belt 37 is shown with a drive roller 38 which is driven by a motor, not shown. The counter blade is arranged obliquely to the rotation axis 17 of the knife roller 15 in this embodiment and is accordingly also attached to a stabilization device 39 on the corresponding wall element, which also includes the guide element 43.

Because the guide element 43 has an obliquely arranged wall, the cutting edge 16 is also due to a corresponding one Mounting on the guide element 43 of the blade 12 obliquely opposite the axis of rotation 17 of the knife roller 15 is arranged. This results in not only an oblique arrangement of the cutting edge 16 in the horizontal direction, but also in the vertical direction. It could also be provided that the cutting edge 16 is arranged parallel to the rotation axis 17 of the knife roller 15 or is arranged obliquely only in the horizontal or only in the vertical orientation.

Fig. 3 shows a schematic three-dimensional representation of the strand cutting device according to the invention Fig. 2 in the assembled state, wherein also a strand 27, for example, a cigarette rod or a filter strand is indicated, which moves in the direction of arrow in the strand cutting device 10.

Fig. 4 schematically shows a sectional view of the cutting region of the strand cutting device according to the invention. The cutting edges 14 and 16 cooperate with each other to allow a defined cut. The counter blade 12 is preferably flexible in this embodiment, which is achieved for example by choosing a suitable material such as a suitable steel grade and in that the free blade length I in a range of 8 to 15 times the height h, preferably in the range of 10.5 up to 12.5 times the height h is.

Fig. 5 shows the functionality of the Scherenschnitts or the hyperboloidal cut or chopped shred. Upon rotation of the knife roller 15 by an angle α, the rear part of the blade 11 passes from the uppermost position to the lowest position. The rear part of the blade 11 is identified by the reference numeral 110. Accordingly, the front part 112 is in the moment where the rear part 110 in the upper region of the Fig. 5 is arranged, engaged with the front part 121 of the counter knife 12. After rotation of the knife roller 15 by the angle α, the rear part 110 of the knife 11 and the rear part 120 of the counter knife 12 at the cutting edge in contact. It is good to see that the cutting edge is vertical both in Fig. 5 moved during the cut as well as radially. This is indicated by the two dash-dotted circles of the knife roller 15. The hyperboloidal cut is provided with the reference numeral 50. The counter knife 12 is fastened with an eccentric screw 22 on a counter knife holder or the guide element 43. It can also be provided to use a normal screw instead of an eccentric screw at this point.

The strand cutting device according to the invention is suitable for cutting cigarettes and / or filter strands of single-lane, two-lane and multi-lane strand machines, wherein all strands can be processed in a single strand cutting device.

The oblique orientation of the cutting edge 14, 14 'of the rotating knives 11, 11' according to the invention is in particular such that it is arranged at an angle relative to a plane which is formed by the axis of rotation of the knife roller and a radial of the knife roller. In addition, the cutting edge of the rotating blade may additionally or alternatively be arranged radially obliquely at an angle to the axis of rotation of the knife roller.

LIST OF REFERENCE NUMBERS

10

Strand cutter

11, 11 '

rotating knife

12

against knife

13

Base of the counter knife

14, 14 '

cutting edge

15

knife roll

16

cutting edge

17

axis of rotation

18

screw

19

eccentric

20

eccentric

21

screw

22

eccentric

23

groove

24

groove

25

groove

26

groove

27

strand

28

casing

29

screw

30

pen

30, 30 '

Stabilization device

31, 31 '

mother

32, 32 '

groove

33

edge

34

edge

35

edge

36

edge

37

drive belts

38

capstan

39

Stabilization device

40

direction of rotation

41

vane

42

vane

43

vane

50

hyperbolic cut

110

rear end of the knife

111

front end of the knife

120

rear end of the counter knife

121

front end of the counter knife

α

angle

β

angle

H

height

l

length

Claims (9)

1. Strand cutting device (10) in the tobacco processing industry with a rotating blade (11, 11') and a counter-blade (12) which co-operate with one another, characterised in that where the blade (11, 11') co-operates with the counter-blade (12) a working area is provided which extends along a cutting edge (14, 14') of the blade in the longitudinal axial direction of the blade (11, 11') when the blade (11, 11') is rotating, and a blade roller (15) is provided on which the rotating blade (11, 11') is disposed, characterised in that the blade roller (15) has at least one groove (23 - 26) which co-operates with a strand (27) so that the strand (27) is conveyed and/or chopped, and the at least one groove (23 - 26) has a sharp outer edge (33 - 36), and the outer edge (33 - 36) is disposed between two grooves (23 - 26), and the two surfaces forming the outer edge (33 - 36) are disposed at an angle β with respect to one another which is acute.
2. Strand cutting device (10) as claimed in claim 1, characterised in that a base (13) of the counter-blade (12) is stationary.
3. Strand cutting device (10) as claimed in claim 1 or 2, characterised in that a cutting edge (14, 14') of the rotating blade (11, 11') and/or a cutting edge (16) of the counter-blade (12) is disposed obliquely with respect to an axis of rotation (17) of the blade roller (15).
4. Strand cutting device (10) as claimed in one of claims 1 to 3, characterised in that the counter-blade is flexible.
5. Strand cutting device (10) as claimed in one of claims 1 to 4, characterised in that the rotating blade (11, 11') is positioned by means of an eccentric device (18-21).
6. Strand cutting device (10) as claimed in one of claims 1 to 5, characterised in that the counter-blade (12) is positioned by means of an eccentric device (22).
7. Strand cutting device (10) as claimed in one of claims 1 to 6, characterised in that the at least one groove (23 - 26) extends in the longitudinal axial direction essentially across the entire width of the blade roller (15).
8. Strand cutting device (10) as claimed in one of claims 1 to 7, characterised in that the rotating blade (11, 11') rotates at a rotation speed which is at least as fast as the strand speed.
9. Strand cutting device (10) as claimed in one of claims 1 to 8, characterised in that at least one guide element (41, 42, 43) is provided, which guides a strand (27) to the rotating blade (11, 11').

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