ITMI20071190A1 - CUTTING DEVICE FOR SEPARATING FLEXIBLE MATERIAL - Google Patents

Description

Description of the industrial invention entitled: "Cutting device to separate flexible material" Description of the invention

The invention concerns a cutting device for the separation of flexible material according to the preamble of claim 1.

A cutting device of this type is known from DE 196 31 494 A1 with a first cutting knife with at least one blade (cutting edge) and with a second cutting knife with at least one blade (cutting edge). The first cutting knife can be operated back and forth in the cutting direction with respect to the second cutting knife, arranged locally fixed, and is guided by locally fixed guides. In connection with this, the first driven cutting knife comprises a blade holder of light metal, which carries at least one cutting edge (blade) of hard metal, preferably containing at least volframium carbide. The cutting device is particularly suitable for separating flexible materials, such as paper, leaves and the like.

According to WO 2004/018167 A1, a further cutting device is known for a web material consisting of one or several layers. Therefore, the web material can be fed in a conveyor plane, in a timed or continuous way, to a cutting tool and, after the separation taking place transversely to the transport direction, it can be discharged in the form of belt portions . The cutting tool includes a movable driven cutting element and a stationary cutting element. The aim of the invention is to create a cutting device of the type mentioned at the beginning, by means of which the quality of the processing is significantly improved, as well as the processing speed.

The task is solved, according to the invention, by means of the execution features of claim 1. Further developments result from the dependent claims.

A first advantage of the cutting device consists in the fact that at least one cutting knife, which cannot be moved back and forth in the cutting direction, is arranged in supports in a rotatable manner about its longitudinal axis. In connection with this, possible manufacturing inaccuracies between the cutting knives, in particular their blades, ie their cutting edges, can be compensated for. The blades of the adjacent cutting knives always touch each other, during the movement of the first cutting knife moved back and forth, in a constant resting position. Therefore, a cutting gap is obtainable, which is substantially equal to zero. Contributions are thus made to the improvement of the processing quality of the flexible material to be separated and to the creation of a precision cutting device. Furthermore, a significant increase in the processing speed is obtainable.

A second advantage of the embodiment according to the invention consists in the fact that in order to achieve the constant resting position of the blades each time arranged adjacent, the setting of the cutting knives is considerably simplified, since in the cutting knives There is no need for expensive setup mechanisms. Therefore, the set-up times occurring up to now during the tuning process can be shortened, for example during the change, or replacement, of blades, respectively blade holders, or cutting knives. The use time of the blades is likewise significantly increased.

A third advantage is motivated by the fact that the blades can be adapted in their mutual arrangement, if necessary, taking into account the physical characteristics of the flexible material to be separated, for example the thickness and / or the modulus of elasticity and / or the shear strength. .

As a fourth advantage it should be mentioned that, in a preferred embodiment, at least one rotatable supported cutting knife has a special geometric arrangement of several blades, in one embodiment the cross section of the cutting knife is a polygon and has in at least two corner points de! polygon, respectively a blade arranged therein. In a further embodiment, the cross section of the cutting knife is an ellipse, including a circle, and on its contour, at distances between them, a blade is respectively arranged. With such an arrangement of blades, a further contribution to the shortening of set-up times is guaranteed in particular. Thus, for example, in the event of wear of a first blade, the cutting knife can be brought into the necessary position for the second blade already arranged on the cutting knife.

The invention is explained in more detail based on an example of execution. In relation to this they show schematically:

figure 1 a cutting device in exploded view,

figures 2a, b a first operable cutting knife,

figures 3a, b a second cutting knife,

Figure 4 a cutting device in the assembly representation,

Figure 5 is a detailed representation (A-A) of Figure 4,

figures 6; 7 the cutting device in operation,

figures 8a, b a cutting knife with several blades.

A cutting device for separating flexible material, preferably web material with one layer, or even with several layers, has a first cutting knife 1 and at least a second cutting knife 5. The first cutting knife 1 is operable in a movable way to come and go in the direction of cutting in locally fixed guides 17, 18 (double arrow 19). The actuation device is, for example, a single actuation device, which can be driven with its own motor, alternatively the actuation device of the cutting device can be coupled to a drive device of a processing machine. In the present example, the first and second guides 17, 18 are arranged, on the end side, respectively in a side wall 13 (cutting device) on its inner surface and preferably extend between the side walls 13. By means of a connection 25 separable, preferably by a screw connection, on the end side each guide 17, 18 is fixed in a separable way with the corresponding side wall 13, In the preferred embodiment each guide 17, 18 is designed as a beam fixed to the side walls 13 and which in turn serves itself as a guide 17, 18. Alternatively each of these beams can also carry several guide elements,

The first cutting knife 1 comprises a blade holder 2 with at least one first blade 3, arranged extending in the longitudinal direction between the side walls 13. The blade holder 2 preferably has a rectangular cross-section and, for weight reduction, can have slots 27, arranged at distances in the longitudinal direction (Figure 2a), The blade 3, respectively the blade holder 2 with blade 3, is arranged in a longitudinal direction in a slightly oblique way, placed under a first angle a, between the side walls 13 (principle of scissors: figure 2a).

At least the second cutting knife 5 cooperates with the first cutting knife 1. The second cutting knife 5 comprises a second blade holder 6 with at least one first blade 7, arranged extending in the longitudinal direction between the side walls 1 3, the blade 7, respectively the blade holder 6 with blade 7, can be arranged / or between the side walls 13, likewise placed in a slightly oblique way in the longitudinal direction under a first corner a. Alternatively, the blade 3, respectively the blade holder 2 with blade 3 and blade 7, respectively the blade holder 6 with blade 7, can both be placed respectively in an angle a.

The second cutting knife 5 is arranged, in support contact with constant dynamic constraint, in a rotatable way with respect to the first cutting knife 1 about its longitudinal axis in supports 14, 15. The at least a first blade 7 of the second cutting knife 5 is arranged perpendicular to the cutting direction (direction of movement of the first cutting knife 1; double arrow 1 9) or inclined, with respect to at least one first adjacent blade 3 of the first cutting knife 1, inclined in a second angle β with respect to the cutting direction (double arrow 19).

In a first embodiment, the two supports 14, 15 are respectively arranged in one of the locally fixed side walls 13. In a second embodiment, one of the supports 14, 15 can be arranged in an oscillating jaw 23, supported as an oscillating arm, in a first side wall 13, preferably in a locally fixed rotatable joint 24, and the other of the supports 14 or 15 is arranged locally fixed in a second side wall 13. In connection with this the oscillating jaw 23 is not limited to an arrangement in a swivel joint 24. Alternatively, instead of the swivel joint 24 a linear guide, locally fixed, or an oblong hole design (not shown) can be arranged in a side wall 13, in particular for adjusting the cutting blades 5; 9. In a third embodiment at least one of the supports 14, 15 can be arranged, as a separate support stand, so that it is fixed on at least one of the side walls 13. The supports 14, 15, arranged opposite each other, are preferably arranged out of alignment (of little) between them.

The second cutting knife 5 is coupled to at least one energy accumulator 20, preferably arranged on at least one of the locally fixed side parts 13. In the present example, the energy accumulator 20 is a spring or system - executed for example as a tension spring - and guarantees, with a dynamic clamping, the necessary support contact of the two cutting blades 1, 5, respectively of their blades 3 , 7. By way of example, tension springs are provided as energy accumulators 20, preferably fixed on each side wall 13 and coupled with the cutting knife 5, which energy accumulators are connected, preferably by means of a point fixed 26, for example an articulation pin, arranged on the respective lateral frame 13 and on the blade holder 6. The energy accumulators 20 are preferably arranged in each front side of the cutting blade 5, respectively of the blade holder 6, as well as preferably of the associated side wall 13.

Instead of the arrangement on the side walls 13, the respective energy accumulator 20 can alternatively be arranged locally fixed externally or on one of the guides 17, 18. In the design of the cutting device with an additional cutting knife 9, this too - similarly to the cutting knife 5 - at least one locally fixed energy accumulator 20 is coupled.

In a first embodiment the second cutting knife 5, or both cutting knives 5; 9, have support pins 21, 22 arranged on the end side and aligned with the longitudinal axis, where the axes of the supports 14, 15 are arranged offset with respect to this longitudinal axis. In relation to this, the supports 14, 15 can be made as pendulum bearings.

In a second embodiment the second cutting knife 5, or both cutting knives 5; 9 have support pins 21, 22 arranged staggered with respect to the longitudinal axis, where the axes of the supports 14, 15 are arranged aligned with respect to the longitudinal axis of the cutting knife 5. In a further embodiment, the second cutting knife 5, or the two cutting knives 5; 9, have a blade 7; 11, arranged obliquely in the longitudinal direction, and the supports 14, 15, as well as the support pins 21, 22 arranged on the end side on the blade holder 6, 10, are arranged aligned.

The first cutting knife 1 can additionally have on the blade holder 2 a second blade 4. The cutting knife 1 then comprises the blade holder 2 with blades 3 and 4 arranged extending in the longitudinal direction between the side walls 13. The blades 3 and 4 are made with axis parallelism to each other and can be arranged between the side walls 13 in a slightly oblique way in the longitudinal direction under the first corner a (principle of the scissor: figure 2a).

In this embodiment, the second cutting knife 5 and, additionally, a third cutting knife 9 cooperate with the first cutting knife 1. The second cutting knife 5 in this case comprises the second blade holder 6 with at least a first blade 7 arranged extending in the longitudinal direction between the side walls 13, The third cutting knife 9 comprises a third blade holder 10 with at least one first blade 11 arranged extending in the longitudinal direction between the side walls 13. The cutting knives 5; 9 are preferably made of the same construction and arranged, only with reference to the first cutting knife 1, with its blades 7, respectively 11, in a specularly opposite way with respect to the respective blade 3, 4.

THE! second cutting knife 5 and third cutting knife 9 are arranged, in constant support contact with dynamic constraint (each time on a longitudinal side) in a rotatable way, with respect to the first cutting knife 1, around their longitudinal axes , in supports 14, 15, and Palmeno a first blade 7 of the second cutting knife 5 and at least a first blade 11 of the third cutting knife 9 are both arranged perpendicular to the cutting direction (direction of movement of the first cutting knife cut 1, double arrow 19) or in an inclined way with respect to the at least one first blade 3, respectively second blade 4, adjacent to the first cutting knife 1 each time in a second angle β with respect to the cutting direction (double arrow 19 ). In figure 7 this is illustrated only by way of example and, for reasons of clarity of vision, only on the third cutting knife 9.

In a preferred embodiment, the first cutting knife 1, in particular the blade holder 2 on its longitudinal side, carries at least one guide nose 16, against which at least the second cutting knife 5 is in contact with dynamic constraint. The first cutting knife 1 carries, in the arrangement of two cutting knives 5, 9 associated with this, in correspondence with each longitudinal side of the knife holder 2, preferably each one such guide nib 16 against which they are in support contact, with dynamic constraint, the second and third cutting knives 5, 9. Alternatively, such a guide nose can be arranged on at least one of the cutting knives 5, 9.

In summary, the first cutting knife 1 in a longitudinal side - conditioned by the energy accumulator 20 - is in constant support contact, with dynamic constraint, with the second cutting knife 5 and additionally on the other longitudinal side is arranged a third cutting knife 9, rotatably around its longitudinal axis, in supports 14, 15 and - in a manner conditioned by the energy accumulators 20 - in constant support contact, with dynamic constraint, with the first cutting knife 1 In relation to this, a first blade 7 of the second cutting knife 2 is arranged perpendicularly with respect to the cutting direction / direction of movement (double arrow 19) or in an inclined manner with respect to an adjacent first blade 3 of the first cutting knife 1 and a first blade 11 of the third cutting knife 9 is arranged perpendicular to the cutting direction / direction of movement (double arrow 19) or in an inclined manner with respect to to a second blade 4 adjacent to the first cutting knife 1.

In a further development, one or each of the two cutting knives 5 and 9 can each time have in addition to the first blade 7, respectively 11, a second blade 8 on the blade holder 6, or a second blade 12 on the blade holder 10. In relation to in this case, the second blade 8 is arranged on the blade holder 6 (second cutting knife 5) diagonally opposite to the first blade 7. Likewise, it is preferred to arrange the second blade 12 on the blade holder 10 (third cutting knife 9) diagonally opposite with respect to to the first blade 11.

Furthermore, the respective additional blade 8, 12 can also be used for the separation, i.e. cutting, of the flexible material, in particular if the first blades 7, respectively 11, after the cutting inserts have become worn, or have lost the edge, in in relation to this, the respective blade holder 6, respectively 10, must only be rotated by 180 °. Figure 8b shows a cross section, suitable for this operating mode, of a cutting knife 5, respectively 9, substantially on the base of a parallelogram.

All the blades 3, 4, 7, 8, respectively 11, 12, described in the present example, are preferably fixed with the respective blade holder 2, 6, respectively 10, by means of a connection with adhesive. Alternatively, the blades 3, 4, 7, 8, 11, 12 can be fixed on the respective blade holder by means of screw connections. Alternatively, the blade holders 2, 6, 10 can themselves serve as blades, since the longitudinal edges of the blade holders 2, 6, 10 are designed as cutting edges.

The direction of movement, respectively cutting direction (double arrow 19) of the cutting device is not limited to the exemplary execution in the vertical direction. Indeed, the cutting device can also be arranged in another angular position.

Observing figure 3a, b it is noted that the second cutting knife 5 is illustrated - contrary to the other figures - by way of example in another angular position.

The operation mode of the cutting device is as follows. The first driven cutting knife 1 slides in the cutting direction / direction of movement (double arrow 19) with the first blade 3 along the second cutting knife 5 along the first adjacent blade 7. In the execution of the first cutting knife 1 with two blades 3, 4, these slide each time on the adjacent blade 7 of the second cutting knife 5, as well as on the adjacent blade 11 of the third cutting knife 9, the cutting knives 5; 9 are in constant support contact with respect to the cutting knife 1, with dynamic constraint, by means of the energy accumulators 20.

In relation to this, it is advantageous that the blade 7 of the second cutting knife 5, respectively the blade 11 of the third cutting knife 9, are not arranged colinearly with respect to the adjacent blade 3, respectively 4 (cutting knife 1) but are arranged perpendicular to the direction of movement (double arrow 19) of the first cutting knife 1 and / or in an inclined way with respect to its blades 3, respectively 4. In this way manufacturing tolerances can be compensated and the contact of support is guaranteed, preferably with dynamic constraint, of the respectively adjacent blades 3 and 7, respectively 4 and 11, so that these constantly touch each other. By means of the rotatable arrangement of the second and, if necessary, of the third cutting knife 5; 9, during the to and fro movement in the direction of the double arrow 19 of the first cutting knife 1, a support contact with dynamic constraint is always guaranteed of the adjacent blades 3 and 7, respectively 4 and 11, and at the same time the cutting knives 5, 9 are rotatable in the supports 14, 15. Therefore, when the flexible material is separated, the cross section "migrates" in the longitudinal direction of the first cutting knife 1, and by means of the rotation movement of the cutting knives 5, 9 in the supports 14 , 15 a crack s is formed (Figures 6, 7).

In the arrangement of one of the supports 14, 15 in a swing jaw 23, supported as a swing arm 23 in a side wall 13 in a swing joint 24, the swing jaw 23 is supported swing around the axis of the associated swing joint 24, respectively in the linear guide arrangement, respectively oblong hole in a movable manner in its degrees of freedom. Regardless of the number of cutting knives 5, 9 used in the separation of the flexible material, each of these fault knives 5, 9 is supported, on the end side, separately in a swinging jaw 23 and in one of the side walls 13. For the '' setting of the inclination of the two cutting knives 5, 9 with their blades 7, 11 (alternatively the blades 8, 12) with respect to the first cutting knife 1 with its blades 3, 4, on the longitudinal side of the knives 1 , respectively 5, 9, between the adjacent blades 3 and 7, respectively 4 and 11, a relatively thin material (preferred thickness <0.2 mm) is positioned in an intermediate way in a preferably defined area. In this way the blade 7 of the second cutting knife 5 rests in a two-point support on the blade 3 of the first cutting knife 1, as well as on the relatively thin material interposed. The oscillating jaw 23 is adjusted in a simple way by means of pressure and oscillation approach. Taking into account the respective arrangement (pivot link 24 or linear guide / oblong hole) on the associated side wall 13, the oscillating jaw 23 is adjusted and stopped before the cutting process. Preferably, the oscillating jaw 23 can be stopped with respect to the adjacent side wall 13, for example by means of a separable connection (screw connection, truncated pin, etc.). Depending on the thickness of the relatively thin material used, different inclinations can be set. The inclination can be set taking into account the flexible materials to be separated. In the case of a gearbox with cutting knives 5, 9 of the same construction, the original setting can be detected, so that no new settings are required.

5 cutting knives; 9 are not limited to the illustrated embodiments, in the number of blades, respectively in its cross section. Indeed each of the cutting knives 5; 9 can have, for an execution of the correspondingly geometric cross section (in the form of a parallelogram, in the form of a star, in the form of a triangle, etc.), a plurality of blades 7, 11; 8, 12. Thus the cross section of the second and / or third cutting knife 5; 9 can be a polygon and in at least two corner points of the polygon can have a blade 7, 11 respectively; 8, 12.

Alternatively, the cross section of the second and / or third cutting knife 5; 9 can have an ellipse, including a circle, and on its circumference at least a blade 7, 11 are arranged at distances between them; 8, 12.

Figures 8a, b illustrate by way of example a rectangular cross section (with four corner points). In relation to this the blades 7, 11; 8, 12 are arranged in two corner points arranged diametrically. In relation to this the blades 7, 11; 8, 12 can be arranged uniformly or at irregular distances between them.

Legend

1 First cutting knife

2 Knife holder (of position 1)

3 First blade

4 Second blade

5 Second cutting knife

6 Knife holder (of position 5)

7 First blade

8 Second blade

9 Third cutting knife

10 Knife holder (of position 9)

11 First blade

12 Second blade

13 Side wall

14 First support

15 Second support

16 Guide nose piece

17 First guide

18 Second guide

19 Double arrow (direction of movement)

20 Energy accumulator

21 First support pin

22 Second support pin

23 Oscillating jaw

24 Swivel joint

25 Separable connection

26 Fixing point

27 Cutout

at First corner

β Second angle

s Slit

Claims

1. Cutting device for separating flexible material with a first cutting knife movable back and forth in locally fixed guides, in the cutting direction, and operable, with at least one blade, and with a second cutting knife, cooperating with the first cutting knife cut, with at least one blade,

Claims (17)

13 Side wall 14 First support 15 Second support 16 Guide nose piece 17 First guide 18 Second guide 19 Double arrow (direction of movement) 20 Energy accumulator 21 First support pin 22 Second support pin 23 Oscillating jaw 24 Swivel joint 25 Separable connection 26 Fixing point 27 Cutout at First corner β Second angle s Slit Claims 1. Cutting device for separating flexible material with a first cutting knife movable back and forth in locally fixed guides, in the cutting direction, and operable, with at least one blade, and with a second cutting knife, cooperating with the first cutting knife cut, with at least one blade, characterized by the fact that the second cutting knife (5) is arranged in contact of <a> PP ° 99 '° constant, with geometric constraint, in a rotatable way, with respect to the first cutting knife (1), around its longitudinal axis, in supports ( 14, 15), and by the fact that a first blade (7) of the second cutting knife (2) is arranged perpendicular to the cutting direction, or inclined, with respect to the cutting direction, with respect to a blade (3) adjacent to the first cutting knife (1). 2. Cutting device according to claim 1, characterized by the fact that the first cutting knife (1) in a longitudinal side is in constant support contact, with dynamic constraint, with the second cutting knife (5), and additionally on the other longitudinal side a third cutting knife (9) is arranged rotatable around its longitudinal axis in supports (14, 15) and is in constant support contact, with dynamic constraint, with the first cutting knife (1), and by the fact that a first blade (7) of the second cutting knife (2) is arranged perpendicularly with respect to the cutting direction or with respect to an adjacent first blade (3) of the first cutting knife (1), and a first blade (11 ) of the third cutting knife (9) is arranged perpendicularly with respect to the cutting direction or inclined with respect to a second adjacent blade (4) of the first cutting knife (1). 3. Cutting device according to claim 1 or 2, characterized by! the fact that the supports (14, 15) are respectively arranged in a locally fixed side wall (13). 4. Cutting device according to claim 1 or 2, characterized in that one of the supports (14 or 15) is arranged in a pivoting jaw (23) which is movable supported in a first side wall (13), and the other of the supports (14 or 15) is locally fixed in a second side wall (13). 5. Cutting device according to claim 4, characterized in that the oscillating jaw (23) is supported movably in a swivel joint (24) arranged in the side wall (13). 6. Cutting device according to claim 4, characterized in that the oscillating jaw (23) is supported movably in a linear guide, or in an oblong hole, arranged in the side wall (13). Cutting device according to claim 5 or 6, characterized in that the oscillating jaw (23) is arranged in an adjustable and lockable arrangement. 8. Cutting device according to claim 1 or 2, characterized in that the supports (14, 15), being opposite each other, are mutually disposed out of alignment. Cutting device according to claim 1 or 2, characterized in that the second cutting knife (5) or both cutting knives (5; 9) have, in the longitudinal direction, a blade (7; 11) arranged oblique, and the supports (14, 15), as well as the support pins (21, 22), arranged on the blade holder (6; 10) on the end side, are arranged aligned. Cutting device according to Claim 1 or 2, characterized in that the cutting knives (5; 9) are coupled at least to a locally fixed energy storage (20) each. 11. Cutting device according to claim 1 or 2, characterized in that the second cutting knife (5), or of both cutting knives (5; 9), have support pins (21, 22) arranged aligned with respect to the longitudinal axis, and the axes of the supports (14, 15) are disposed distorted with respect to this longitudinal axis. 12. Cutting device according to claim 1 or 2, characterized in that the second cutting knife (5), or both cutting knives (5; 9), have support pins (21, 22) arranged staggered with respect to the longitudinal axis, and the axes of the supports (14, 15) are arranged aligned with respect to the longitudinal axis of the cutting knife (5; 9). 13. Cutting device according to claim 1 or 2, characterized in that the first cutting knife (1) carries, in addition to the first blade (3), a second blade (4), and the two blades (3, 4) they are arranged with axis parallelism. Cutting device according to one of claims 1 or 2 and 13, characterized in that the second and / or third cutting knife (5, 9) each have, in addition to the first blades (7, 11) , a second blade (8) on the second cutting knife (5) and a second blade (12) on the third cutting knife (9). 15. Cutting device according to claim 14, characterized in that each of the second blades (8, 12) is arranged diagonally opposite to the first blades (7, 11). 16. Cutting knife for a cutting device for separating flexible material, characterized in that the cross section of the cutting knife (5; 9) is a polygon, and in that in at least two corner points of the polygon a blade (7, 11; 8, 12) is respectively arranged. 17. Cutting knife for a cutting device for the separation of flexible material, characterized in that the cross section of the cutting knife (5; 9) is an ellipse, including a circle, and in that on its contour are arranged, at a distance from each other, respectively, a blade {7, 11; 8, 12).