JP2022525956A - Knife drum - Google Patents

Abstract

A knife drum (1) for cutting, in particular cross-cutting, material webs, especially paper, cardboard and / or plastic material webs, is illustrated and described, has a support (2), and surrounds it. Each of the support (2) is spaced apart from each other in the circumferential direction and essentially extends in the longitudinal direction of the support (2), preferably in a strip-like knife arrangement (5). A plurality of elongated holding and / or fastening sections (3, 4) configured to be fastened are provided. According to the present invention, the holding and / or fastening sections (3, 4) are made to extend at least piecewise differently from each other in the longitudinal direction of the support (2). [Selection diagram] Fig. 1

Description

The present invention is a knife drum for cutting material webs, in particular paper, cardboard and / or plastic material webs, especially laterally, having, for example, a roller-like support around it. A plurality of elongated holding and / or fastening sections each spaced apart from each other in the circumferential direction of the support and essentially extending longitudinally of the support, each preferably fastening a stripped knife arrangement. Concerning the constructed knife drum. Furthermore, the present invention relates to a fastening system with a knife drum.

The type of knife drum of interest is used, for example, in cross-cutting machines. Such cross-cutters are used to cut and / or perforate a material web that is being transferred and moved laterally to the transfer direction or transfer direction. Using a cross cutter, the material web can be cut in one or several times, and sheets of the same length and / or different lengths can be made from the material web. Alternatively, the moving material web may be provided with one or more lateral perforations. The material web can be paper, cardboard, plastic or metal leaf, cloth, and other material webs. For example, in a so-called "synchronous cross-cutter", two knife drums are provided, which are rotatably placed up and down within the machine frame, the knives are cut and engaged in pairs during rotation, and a continuous web of material. Cut laterally. The "combo cross cutter" includes a rotatably arranged knife drum and a fixed knife that works with it. In the so-called "crash cut", the knife on the knife drum contacts the anvil on the anvil drum.

To achieve a "floating" cut through the material web from one side to the other, the knife usually does not extend axially, i.e., parallel to the axis of rotation of the knife drum, with respect to the axis of rotation. Extends at a so-called offset or twist angle, whereby one end of the knife is circumferentially offset with respect to the other end and is therefore always in a leading position with respect to the other end. To achieve such an offset arrangement, for example, a flattening surface section can be formed around the cylindrical support of the knife drum by a material removal method, which flattening surface section is on its longitudinal axis. It extends longitudinally along the axially parallel support to form a plane for fastening the strip-shaped knife holder. This plane extends laterally with respect to the radius and is bounded by the longitudinal leading edge and the longitudinal trailing edge in the direction of rotation of the support. The two longitudinal edges extend from one side of the support to the other side parallel to the axis of rotation of the support. By forming a flattened elongated surface portion, the segment is separated from the perimeter of the support to form a plane, a parallelepiped knife that is linear at the desired offset angle with respect to the direction of the axis of rotation. Allows easy placement of strips.

From German Patent No. 10 2005 058 600 A1, the above-mentioned type of knife drum is known, where the knife drum has a roller-like body, on its circumference deviating from its rotational shape and rolling. A flat, elongated surface section that extends substantially in the longitudinal direction of the shaped body is formed, to which a strip-shaped knife arrangement that substantially extends in the longitudinal direction of the roller-shaped body can be attached. The elongated surface portion extends substantially in a partial spiral in the longitudinal direction of the roll body, and the strip-shaped knife arrangement can be formed into a substantially corresponding partial spiral. It should be understood that the "partial helix" is, in the present disclosure, that the helix angle with respect to the direction of the axis of rotation is substantially less than 360 °, as opposed to a perfect helix. The surface section, which has a substantially partial spiral course, allows the surface section to adapt to the shape of the stripped knife arrangement after it is supported in a simple and at the same time clever way.

Changing the material web can cause cutting problems with known knife drums due to differences in the web properties and composition of the material web when implementing mobile cutting. These cutting problems can increase material waste and thus increase sheet manufacturing costs. So far, if cutting problems occur when cutting the material web, the knife drum is removed and a knife drum with a knife arrangement is installed, the knife having a different course in the longitudinal direction of the support body. However, replacing the knife drum is time consuming and involves interruption of material web processing. Therefore, replacing the knife drum also leads to an increase in the manufacturing cost of the sheet.

German Patent No. 10 2005 058 600 A1 European Patent No. 0 986453 B1 European Patent No. 0 995 560 A2

An object of the present invention is to further develop and provide a cutter drum of the above type, which makes it possible to eliminate the cutting problem in a structurally simple manner with little effort, especially the cutter drum. No need to replace. Further, the present invention is based on the object of providing a fastening system for fastening a knife operating at an angle to a rotation axis to a knife drum, which allows a slight downtime of a cross-cutting machine. The problem of disconnection can be eliminated.

The above object is achieved by a knife drum having the characteristics of claim 1 and by a fastening system having the characteristics of claim 10. An advantageous embodiment of the present invention is the subject of the dependent claims.

The present invention is a knife drum for "moving" cutting, especially lateral cutting, of material webs, in particular paper, cardboard, and / or plastic material webs, eg, cylindrical, triangular, or T-shaped. A plurality of elongated holding and / or fastening sections, each of which are spaced apart from each other in the circumferential direction of the support and essentially extends in the longitudinal direction of the support. With respect to a knife drum configured to fasten a stripped knife arrangement. According to the present invention, the knife drum has at least two holding and / or fastening sections that extend differently in at least a plurality of longitudinal sections of the support. Knife arrangements in which the knives have different courses in the longitudinal direction of the support can be simply fastened to the holding and / or fastening surface of at least two holding and / or fastening sections. In other words, this means that different knife arrangements do not extend axially, i.e., parallel to the axis of rotation of the knife drum, but at least a support that extends at a specific different angle with respect to the axis of rotation. It means that it can be fastened to two holding and / or fastening sections. It is preferred that the holding and / or fastening surfaces of the holding and / or fastening section also show correspondingly different courses.

In the present invention, the term "offset angle" in the case of a linearly extending holding and / or fastening section, or the term "twisting angle" in the case of a partially spirally extending holding and / or fastening section, is a support. Refers to the angle between the axis of rotation of the support and the course of the holding and / or fastening section in the longitudinal direction of the support. When the cutting edge of a partially spiral knife is shown unwound, a straight line with a constant pitch is obtained as a spiral, as is also known from screws, for example. For holding and / or fastening sections or holding and / or spiral or partially spiral courses of fastening surfaces, the helix angle is related to the angle between the axis of rotation of the support and the unwound spiral. There is. In particular, the "offset angle" or "twist angle" relates to the angle between the axis of rotation of the support and the longitudinal holding and / or holding of the fastening section and / or the centerline of the fastening surface of the support. ing.

The course of the longitudinal holding and / or fastening section of the support preferably corresponds to the course of the cutting edge of the knife connected to the support via the holding and / or fastening section during the cutting operation.

As the offset or helix angle decreases, the cutting force generated in the cross section increases. The force flow can vary as a function of angle, and the appropriate angle needs to be defined specifically as a function of material composition and / or material thickness.

In the present invention, offset or twist angles in the range of 0.1 ° to 10 °, preferably in the range of 2 ° to 5 °, have been shown to be advantageous. Particularly suitable is an offset angle or twist angle between 0.1 ° and 5 °, preferably between 0.5 ° and 2 °, more preferably 1 ° with respect to the holding and / or fastening section. It is an embodiment that is between 1.5 ° and 1 ° to 10 °, preferably between 2 ° and 8 ° for another holding and / or fastening section. Thus, with the right equipment of a cutter drum with the right cutter, webs of very different materials can be cut in the same way with the same cutter drum in a very satisfactory way.

If cutting problems occur when cutting the material web, such as delamination, scratches on the surface of the material web, surface peeling, and replace the inserted knife with a knife of a different course in the longitudinal direction of the support. If necessary, there is no need to remove the knife drum to replace the knife. Rather, the knife arrangement inserted into the knife drum can be removed or disassembled from the first holding and / or fastening section of the knife drum without disassembling the knife drum. To solve the cutting problem, the knife arrangement can be fastened or attached to another holding and / or fastening section of the knife drum, the knife having different courses in the longitudinal direction of the support at least in multiple sections. Have. In this way, if cutting problems occur due to the non-optimal course of the knife in the longitudinal direction of the support, the process interruption of material processing can be significantly reduced, which reduces the production cost of the sheet. It leads to reduction.

Different materials in different cuts and applications, with little effort and in a short switching time and structurally simple method, due to the ability to place knives as needed or attach knives of different courses to the knife drum. The same knife drum can be used equally to cut the web.

In the present invention, the term "knife arrangement" is preferably a stripped knife, or preferably a stripped knife holder configured to fasten at least one knife, or shape matching and / or through screws, for example. Means a combination of both with a knife fastened to a knife holder in a pressure-fitting manner and / or in a material conformance manner, for example via an adhesive connection, and / or a knife that can be secured to a support via a knife holder. do. The knife holder can be screwed to the support and / or clamped or fixed to the support via a clamping element. The knife can be configured as a continuous strip or can consist of multiple knife elements placed in a straight line back and forth in the longitudinal direction of the support.

For example, the knife can be clamped to the knife holder by clamping means and / or screws and / or screwed to the knife holder by fastening screws, for example, as disclosed in European Patent No. 0 986453 B1. Adhesive connections can also be provided. A feasible embodiment of the invention in which the knife is clamped into the recess of the support via the knife holder is described in European Patent No. 0995 560 A2. To clamp the knife into the recess of the support, a knife-arranged clamp wedge that is screwed into the recess can be used.

The knife configuration can be connected to the holding and / or fastening section in a non-destructive and removable manner, for example via clamping means and / or mechanical locking means such as screws. Adhesive connections are not excluded either.

The retaining and / or fastening section can be formed, for example, as a flattened surface section, at least in the section around the support. The retention and / or fastening section can be incorporated into the support in detail by a material removal process. However, the retaining and / or fastening sections are formed on and / or on separate components that are detachably connected (eg, screwed) to the support in a preferably non-destructive manner. It does not exclude that. This component forms the holding and / or fastening section of the cutter drum.

The knife arrangement preferably consists of metal and / or metal alloy. The support also preferably comprises a metal and / or a metal alloy. However, it is also possible to manufacture supports and / or knife arrangements from fiber reinforced materials such as fiber reinforced plastics such as carbon fiber reinforced plastics or fiber composite plastics. It can also be manufactured from wood-based materials or ceramics. In this way, depending on the application, sufficient strength and rigidity of the support and / or knife arrangement for cutting the support and / or material web can be achieved.

Preferably, the holding and / or fastening section extends along the entire length of the support. Therefore, if necessary, a knife arrangement extending over the entire length of the support can be fixed to the support. If the knife arrangement is extended by a partial length, the knife arrangement can be secured to the holding and / or fastening section at various distances from the end of the support, if desired. However, it is not excluded that the holding and / or fastening section extends only over a partial length of the support.

In an advantageous embodiment of the invention, the plurality of holding and / or fastening sections of the support extend longitudinally of the support in different partial spirals with different pitches or different helix angles with respect to each other at least in the plurality of sections. To be done. Thus, the knife arrangement will also be substantially a partial helix and / or will be arranged to fasten a knife with a particular partial helix course.

This is advantageous when at least two retaining and / or fastening sections on the support extend longitudinally on the support in different partial helices with different pitches over the entire length of the support.

In the context of the present invention, the term "partial spiral" means that the holding and / or fastening portion completes less than one full rotation around the longitudinal axis of the support in the circumferential direction of the support. It should be understood to mean. Preferably, the holding and / or fastening section is around the longitudinal axis of the support over a circumference of substantially less than 180 °, preferably over a circumference of substantially less than 45 °. It extends in the direction or the direction of rotation. The retaining and / or fastening section can have an outer fastening surface that is further bent by the offset angle, in addition to a twist about its longitudinal axis, resulting in a concave shape of the outer fastening surface.

The partial spiral course of the retention and / or fastening section prevents at least substantial weakening of the support. The original strength and stiffness of the support remains essentially unaffected.

The knife arrangement indicates a longitudinal course of the support, which preferably corresponds at least substantially to the course of the holding and / or fastening section. Floating cutting can be achieved by the knife arrangement, especially the partial spiral shape of the knife edge. In "floating cutting", the material web is cut from one side to the other. By "floating cutting", the cutting force can be reduced, and thus the wear of the cutting edge and the knife drum can be effectively reduced.

However, in addition to this, it is also possible in principle to provide an embodiment in which the holding and / or fastening section extends linearly rather than partially spirally in the longitudinal direction of the support. This allows the linear knife arrangement to be fastened at a desired offset angle with respect to the direction of the rotation axis of the support.

In a more advantageous embodiment, at least one holding and / or fastening section is preferably formed as a groove extending over the entire length of the support. In the partial spiral groove, a strip-shaped knife arrangement curved in a partial spiral shape can be fastened according to the path of the groove. Elements for mechanically fastening and / or aligning the knife arrangement, and / or elements for fastening and / or aligning the cutting edge of the knife in the knife arrangement can be provided. These can be, for example, fastening and / or locking screws. This preferably allows the screws to be evenly distributed over the length of the holding and / or fastening section or evenly spaced from each other to ensure uniform contact pressure when fastening the knives.

However, the grooved retention and / or fastening section can also be configured in principle to accept a knife arrangement having a different course in the longitudinal direction of the support than the grooved retention and / or fastening section. ..

By configuring the holding and / or fastening section as a recess around the support, especially as a groove extending longitudinally of the cutter drum, the cutter arrangement holds and / or the fastening section or cutter with little assembly and wasted time. Can be fastened to or there on the drum. In this regard, the groove can act as a guide, facilitating the positioning of the knife arrangement. For example, the knife arrangement can be inserted vertically (radially) into the groove from the outside. However, the knife arrangement can also be inserted into the holding and / or fastening section in the longitudinal direction of the support. Conversely, if the knife placement is changed, the knife can be lifted vertically from the groove in the longitudinal direction and pulled out or pushed out of the holding and / or fastening section.

Grooves can be machined into the support of the knife drum or the sides of the support by an ablation process, especially by milling. The groove depth can be preferably in the range of 2 to 100 mm, preferably in the range of 2 to 50 mm. This ensures a firm hold of the knife placement and avoids the removal of large amounts of material.

Particularly preferably, the holding and / or fastening sections are formed as longitudinal grooves around the support and have different longitudinal courses of the support in at least a plurality of sections. Particularly preferably, at least two grooves having different partial spiral courses in the longitudinal direction of the support are provided. In this way, knives with different longitudinal courses of support can be held or fastened to the knife drum in a simple way. In this regard, the knife drum may be provided with a linear groove as a holding and / or fastening section and at least one groove, which may extend linearly in the longitudinal direction of the knife drum. Not particularly extending in a partial spiral.

Alternatively, at least one retaining and / or fastening section may be formed as a flattened surface section forming a secant that blocks the circular cross section of the support, as described in German Patent No. 10 2005 058 600. can. This allows for a simple and inexpensive design of holding and / or fastening sections on the support. It is not necessary to incorporate complex shapes such as edge shapes or circular surfaces into the support. Rather, the support can be machined along a flat surface in a uniform mechanical manner, preferably by milling. The knife edge arrangement that can be fastened to the secant holding and / or fastening section can be configured to fasten a knife that extends linearly in the longitudinal direction and extends linearly. In the secant holding and / or fastening section, a knife arrangement configured to receive a partial spiral knife can also be fastened in principle, for example, with suitable clamp and / or spacer components.

Further feasible design features of the retention and / or fastening section are exemplified and described in German Patent No. 10 2005 058 600.

In a more preferred embodiment, the holding and / or fastening sections can be arranged so that they are distributed substantially symmetrically around the support. In particular, this allows uniform concentricity of the cutter drums in the cutting process.

As already described above, the course of knife placement, and especially the course of cutting knives in the longitudinal direction of the support, can be adapted to the course of holding and / or fastening sections. This allows the knife arrangement to be stably attached to the holding and / or fastening section. Using the corresponding course of holding and / or fastening sections, the knife arrangement is linear, eg, partially spiral, in the longitudinal direction of the support, or with an offset angle with respect to the direction of the rotation axis of the support. Can be postponed.

As already mentioned above, in the operating state of the cutter drum, i.e. during the cutting operation, the cutter assembly can preferably be attached to only one holding and / or fastening section. Preferably, the counterweight can be attached to at least one other holding and / or fastening section. The counterweight displaces the center of gravity of the cutter drum. Preferably, the counterweight is attached to the holding and / or fastening section in this way and / or a geometry such that the cutter drum substantially rotates around its center of mass when cutting the material web. And / or have mass. Due to the uniform rotation, energy savings can be achieved when operating the knife drum. In addition, the mechanical load on the knife during cutting is reduced and the service life of the knife arrangement is extended.

It may be convenient to connect the holding and / or mounting section to the knife assembly and attach the counterweight to each of the remaining holding and / or mounting sections of the knife drum.

An alternative embodiment of the invention has a knife drum, in particular the knife drum of the type described above, with at least one knife holder that can be fastened to at least one holding and / or fastening section of the support of the knife drum. It relates to a fastening system having a knife holder configured to hold a knife extending at different offset or twist angles with respect to the axis of rotation of the support, as required. The above aspects also help eliminate the need to replace the knife drum when cutting problems occur. This alternative embodiment relates to the use of a knife holder in which a plurality of different knives, i.e. knives having different courses in the longitudinal direction of the support, are equally constructed and placed. If desired, clamps, spaces or fastening means such as screws can be used to fasten different knives to the same knife holder. The knife holder itself is preferably fixed to the holding and / or fastening portion of the support of the knife drum, as described above in connection with the knife drum according to the invention.

A further alternative embodiment of the invention comprises at least one holding and / or fastening section of the support, preferably at least two knife holders capable of fastening to multiple holding sections, particularly of the type described above. In a fastening system with a knife drum, the first knife holder holds the first knife, which extends at a first offset or twist angle with respect to the axis of rotation of the support, preferably releasably. The second knife holder is configured to hold the second knife, or preferably at a different second offset or twist angle with respect to the axis of rotation of the support. It relates to a fastening system that is detachably connected to an extending second knife. This embodiment is the use of at least two differently formed knife holders, each of which supports or holds a knife, and the knives of the two knife holders are longitudinal or support rotation. Regarding the usage of the knife holder, which differs with respect to the course of the knife at each offset or twist angle with respect to the axis. To fasten the knife holder, two differently configured holding and / or fastening sections can be provided on the support, preferably as described above in connection with the knife drum according to the invention. However, in principle, it is possible to provide only one holding and fastening section for fastening the knife holder. Thus, the knife holders are equally configured and provided to fasten to the same holding and / or fastening section of the support, if desired.

Further advantages, features, features and embodiments of the present invention will be apparent from the following description of the claims and preferred embodiments with reference to the drawings. The advantages, features, properties and embodiments of the invention described and / or illustrated can be combined with each other as needed, even if not described or illustrated in detail. The range of values specified includes all intermediate integer values.

For example, a knife drum according to the invention having two equally spaced holding and / or fastening sections on a roller support of the knife drum, in which the helix angle of the partial spiral holding and / or fastening sections is graphically It is a displayed perspective view. It is a figure showing the holding and / or rewinding of the holding and / or fastening section of the cutter drum shown in FIG. 1 with respect to the center line of the holding and / or fastening section. FIG. 6 is a cross-sectional view of a further embodiment of a knife drum according to the invention, in which the knife is clamped to the holding and / or fastening section. FIG. 3 is a schematic representation of a further embodiment of a knife drum according to the invention, comprising a knife arrangement and a counterweight provided on the opposite side of the knife arrangement.

In the following description, the same reference numbers are used for the same and similar components so that the corresponding properties and features are obtained without repeated description.

FIG. 1 shows a perspective view of a knife drum 1 according to the invention for cutting material webs, in particular paper, cardboard and / or plastic material webs, in particular cross-cutting, using the roller support 2. The knife drum 1 is particularly used in cross-cutting machines for making sheets from paper or cardboard webs. Such a cross-cutting machine typically comprises two knife drums 1 rotatably mounted up and down within the machine frame, the knives cutting and engaging in pairs during rotation.

On the circumference 2a of the support 2, a first holding and / or fastening section 3 (according to the front part of FIG. 1) and a second holding and / or fastening section 4 (according to the rear part of FIG. 1) are respectively. It is formed as a groove-like recess. The two retaining and / or fastening sections 3 and 4 are arranged opposite each other on the support 2 and are distributed substantially equidistant over the perimeter 2a of the support 2. Thereby, the groove bases of the two recesses form the two holding and / or fastening surfaces 3a and 4a of the two holding and / or fastening sections 3 and 4. Holding and / or fastening surfaces 3a and 4a are formed and, if necessary, provided to fasten the knife arrangement 5 which extends differently to the support in the longitudinal direction of the support 2.

In the direction of rotation of the support 2, the holding and / or fastening section 3 has a longitudinal leading edge and a longitudinal trailing edge that have the same course in the longitudinal direction of the support 2 and thus extend parallel to each other. The holding and / or fastening surface 3a preferably has a centerline or transfer line 17 corresponding to the course of the knife 11, particularly the cutting edge course that can be fastened to the holding and / or fastening section 3 (see FIG. 3).

When the roll line 17 is unwound (unwinded) and shown, a straight line corresponding to the pitch of the roll roll 17 (the unwinded roll 18 according to FIG. 2) is obtained. The angle between the axis of rotation of the support 2 and the unwound rolling line 18 is hereinafter referred to as the helix angle γ.

The abscissa of the coordinate system shown in FIG. 2 indicates the extension of the unwound rolling line 18 in the circumferential direction of the support 2, and the ordinates indicate the unwound rolling line 18 in the longitudinal direction of the support 2. Corresponds to the length of. The helix angle γ corresponds to the angle between the coordinates (longitudinal axis of the support 2) and the unwound roll.

It has not been shown that the holding and / or fastening portion 3 can, as an alternative, be formed as a groove that extends linearly in the longitudinal direction of the support 2.

The holding and / or fastening portion 3 extends only over a portion around the support 2. As can be seen from FIGS. 1 and 2, the turn line 17 has completed less than one complete turn around the axis of rotation of the support. Preferably, the twisted wire 17 extends over less than half of its perimeter, preferably less than a quarter of its perimeter of support 2. Therefore, the value n in FIG. 2 is assumed to be a value larger than 1, preferably a value larger than 2, and more preferably a value larger than 4. Advantageously, the helix angle γ corresponds to a value between 0.1 ° and 10 °.

The holding and / or fastening surface 4a of the second holding and / or fastening section 4 has a helix angle different from that of the first holding and / or holding and / or fastening surface 3a on the opposite side of the fastening section 3. Extends over 2a around. This allows the knife arrangement 5 to be fastened to the support 2, which has different (partially spiral) paths in the longitudinal direction of the support 2.

In FIG. 3, a further embodiment of the knife drum 1 according to the invention is shown with two different holding and / or fastening sections 3, 4. The groove-shaped recesses in the periphery 2a of the support 2 each have a first side wall 7 and a second side wall 8, which are arranged apart from each other in the circumferential direction of the support 2. The sidewalls 7 and 8 preferably converge towards each other in a wedge shape and the groove depth is radially bounded by the groove base 9. Therefore, the two holding and / or fastening sections 3 and 4 have a trapezoidal cross section. The groove base 9 is provided with at least one screw hole 10 oriented substantially perpendicular to the groove base 9. The steel strip 16 can be inserted into the groove, for example, on one side, on both sides, on the underside, or in a lining manner.

According to FIG. 3, the knife arrangement 5 is fastened or held in a second holding and / or fastening section 4. The knife arrangement 5 comprises a knife 11 and a clamp element 12 formed substantially complementary to the grooved retention and / or fastening section 4. The clamp element 12 has a substantially trapezoidal cross section. The clamp element 12 has at least one through hole through which the screw 13 screwed into the screw hole 10 of the support 2 is guided. The clamp element 12 is pulled into the grooved holding and / or fastening section 4 by the screw 13. Preferably, a plurality of screw connections are provided in the longitudinal direction of the holding and / or fastening sections 4, and more preferably they are equidistant from each other. By tightening the screw 13, the knife 11 is clamped and fixed in place. In order to make the knife 11 better adjustable, as shown in FIG. 3, an adjusting screw 14 acting vertically can be provided on the side surface of the knife 11 facing opposite to the clamp element 12. Similarly, as an alternative, the knife arrangement 5 can be secured to the first holding and / or fastening portion 3. The exemplary selected embodiment described above preferably relates to an upper cutter with an adjustable cutter 11. On the other hand, the cutter 11 can also be non-adjustably clamped to the lower cutter. Therefore, the holding and / or fastening to the fastening section 4 of the knife arrangement 5 described above should be understood as exemplary and is not limited to the fastening means described.

In order to realize mobile cutting, the knife arrangement 5, that is, the knife 11, does not extend in parallel to the rotation axis of the support 2 in the axial direction, but extends at a certain helix angle with respect to the rotation axis of the support 2. There is. The knife 11 preferably has the same longitudinal course as the holding and / or fastening section 4. The holding and / or fastening sections 3 and 4 extend partially spirally at a helix angle γ with respect to the longitudinal axis of the support 2 according to the course of the knife 11. Retention and / or fastening sections 3 and 4 further have courses that differ from each other in longitudinal direction.

For example, if there is a cutting problem that can occur when changing materials, or if you make different cuts, the knife placement 5 used is simply changed to another knife placement 5 with a different (partial spiral) course. You can change it in a short time. For this reason, it is not necessary to remove the knife drum 1 from the cross-cutting machine. It is sufficient to remove the used knife arrangement 5 from the holding and / or fastening sections 3 and 4 and attach the knife arrangement 5 with different longitudinal courses to the other holding and / or fastening sections 4 and 3. In this way, since it is not necessary to replace the knife drum 1 which takes time, it is possible to reduce the downtime of the cross-cut machine due to the change of the knife arrangement 5 when the cutting problem occurs.

As shown in FIG. 3, due to the operation of the cutter drum 1, preferably only one cutter arrangement 5 is attached to one of the two holding and / or mounting sections 3, 4.

In FIG. 4, a further embodiment of the knife drum 1 in which the two holding and / or fastening sections 3 and 4 are located opposite each other on the periphery 2a is shown in cross-sectional view. As can be seen from FIG. 4, on the peripheral 2a of the support 2, substantially opposite to each other, the holding and / or fastening surfaces 3a and 4a deviate from the rotational shape and extend in the longitudinal direction of the support 2. A flat surface section is provided to form the. The holding and / or fastening surfaces 3a and 4a are strip-shaped and have a substantially straight or flat cross section to accommodate the knife arrangement 5 shown only schematically underneath. Therefore, the holding and / or fastening surfaces 3a and 4a form a secant in the cross section of the support 2, and this secant blocks the circular cross section of the support 2 and the support 2 is parallel to the rotation axis of the support 2. A section extending in the longitudinal direction of the is formed, or, if necessary, a partial spiral section for fastening the knife arrangement 5 is formed. The holding surface and / or the fastening surfaces 3a and 4a are for fastening the knife of the knife arrangement 5 extending linearly to the support 2 at an offset angle with respect to the rotation axis of the support 2, or where appropriate. It is also possible to fasten a knife with a knife arrangement 5 extending in a partial spiral with a certain helix angle with respect to the rotation axis of the support 2.

The holding and / or fastening surfaces 3a and 4a can be bounded by the lateral shoulders 6 at one longitudinal edge or at both longitudinal edges. Next, the knife arrangement 5 is preferably supported by the shoulder portion 6 in the fastened state. The shoulder 6 facilitates positioning of the knife arrangement 5 on the holding and / or fastening sections 3 and 4. Assembling the knife arrangement 5 can be performed in a short time with less labor.

As shown in FIG. 4, the knife arrangement 5 is attached to the first holding and / or mounting portion 3. The knife arrangement 5 is shown only schematically in FIG. 4 and may include a strip knife 11, a strip knife holder, or a knife 11 attached to the knife holder. The knife arrangement 5 is attached to the support 2 via a mechanical fastening means (not shown). Preferably, fastening screws are used to fasten the knife arrangement 5. Alternatively, other releasable fastening means can be implemented. Further, additionally or alternatively, the knife arrangement 5 can be joined to the holding and / or fastening section 3.

The generally shown counterweight 15 can be attached to a second holding and / or fastening section 4. Preferably, the counterweight 15 is configured such that the knife drum 1 rotates substantially around the center of gravity during the cutting operation. By arranging the counterweight 15 on the opposite side of the knife arrangement 5, the imbalance during operation of the knife drum 1 can be reduced and the useful life of the knife drum 1 can be extended.

1 Knife drum 2 Support 2a Scope 3 Holding / fastening section 3a Holding / fastening surface 4 Holding / fastening section 4a Holding / fastening surface 5 Knife arrangement 6 Shoulder 7 Side wall 8 Side wall 9 Groove base 10 Screw hole 11 Knife 12 Clamp element 13 Screw 14 Adjusting screw 15 Counterweight 16 Steel strip 17 Turnaround line 18 Turnaround line

Claims (10)

A knife drum (1) for cutting, especially cross-cutting, material webs, especially paper, cardboard, and / or plastic material webs, which has a support (2) around which the said Arranged at intervals in the circumferential direction of the support (2) and essentially extending in the longitudinal direction of the support (2), preferably fastening strip-shaped knife arrangements (5) respectively. In a knife drum (1) provided with a plurality of configured elongated holding and / or fastening sections (3, 4).
A knife drum (1), wherein the holding and / or fastening sections (3, 4) extend at least partially differently from each other in the longitudinal direction of the support (2). The holding and / or fastening sections (3, 4) have different partial spirals in the longitudinal direction of the support (2) with different helix angles with respect to the axis of rotation of the support (2) in at least a plurality of sections. It is characterized by extending. The knife drum (1) according to claim 1. The holding and / or fastening sections (3, 4) extend linearly in the longitudinal direction of the support (2) at different offset angles with respect to the axis of rotation of the support (2). The knife drum (1) according to claim 1 or 2. Any one of claims 1 to 3, wherein the at least one holding and / or fastening section (3, 4) is preferably formed as a groove extending over the entire length of the support (2). The knife drum (1) according to the item. It is characterized in that at least one holding and / or fastening portion (3, 4) is formed as a flat surface portion formed substantially like a secant in the circumferential direction of the support (2). The knife drum (1) according to any one of claims 1 to 4. Any of claims 1-5, wherein the holding and / or fastening sections (3, 4) are arranged substantially symmetrically around the support (2). The knife drum (1) according to item 1. The knife arrangement (5) is fixed to at least one holding and / or fastening section (3, 4), and the knife arrangement (5) substantially corresponds to the holding and / or fastening section (3, 4). The knife drum (1) according to any one of claims 1 to 6, wherein the support (2) is formed in the longitudinal direction. The knife drum (1) according to claim 7, wherein the knife arrangement (5) extends partially spirally or linearly in the longitudinal direction of the support (2). The knife drum (1) according to any one of claims 1 to 8, wherein the counterweight (15) is attached to at least one holding and / or fastening section (3, 4). ). A fastening system comprising a knife drum (1) for cutting material webs, in particular paper, cardboard, and / or plastic material webs, in particular cross-cutting, wherein the knife drum (1) is a support (1). 2), wherein at least one holding and / or fastening section (3, 4) is provided around the holding and / or fastening section (3, 4), preferably a strip-shaped knife arrangement (5), particularly any one of claims 1-9. It is configured to be fastened using a knife drum (1) by
The holding and / or fastening section (3, 4) is provided with at least one knife holder that can be fastened, and the knife holder extends at a different angle to the rotation axis (2) of the support (2), if necessary. Configured to hold the knife (11),
And / or have at least two knife holders capable of fastening to the holding and / or fastening sections (3, 4), preferably a plurality of holding and / or fastening sections (3, 4) of the support (2). The first knife holder is configured to hold the first knife (11) and / or preferably be detachably connected to the first knife (11). 11) extends at a first angle with respect to the axis of rotation of the support (2) and a second knife holder holds the second knife (11) and / or preferably the second knife. A fastening system configured to be detachably connected to (11), wherein the second knife (11) extends at different angles with respect to the axis of rotation of the support (1).

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