阅读说明：本技术 刀辊 (Knife roller ) 是由 托尔斯滕·格特克 马蒂亚斯·博里 于 2020-03-10 设计创作，主要内容包括：显示并描述了一种刀辊(1),其用于切割材料幅带,特别地横切材料幅带,特别是由纸、硬纸板和/或塑料制成的材料幅带,该刀辊包括支撑主体(2),在支撑主体的圆周上预设有多个细长的保持和/或紧固部段(3、4),这些保持和/或紧固部段在支撑主体(2)的周向方向上彼此相隔,基本上在支撑主体(2)的纵向方向上延伸,并且被设计用于分别紧固优选条形的刀片布置(5)。根据本发明预设了,保持和/或紧固部段(3、4)在支撑主体(2)的纵向方向上的走向至少逐段地相互不同。(A knife roller (1) for cutting a material web, in particular transversely to a material web, in particular made of paper, cardboard and/or plastic, is shown and described, comprising a support body (2) on the circumference of which a plurality of elongate retaining and/or fastening sections (3, 4) are prearranged, which are spaced apart from one another in the circumferential direction of the support body (2), extend substantially in the longitudinal direction of the support body (2) and are designed for fastening a preferably strip-shaped blade arrangement (5) respectively. According to the invention, it is provided that the course of the holding and/or fastening sections (3, 4) in the longitudinal direction of the support body (2) differs from one another at least in sections.)

1. Knife roller (1) for cutting a web of material, in particular transversely to a web of material, in particular made of paper, cardboard and/or plastic, comprising a support body (2) on the circumference of which a plurality of elongate holding and/or fastening sections (3, 4) are prearranged, which are spaced apart from one another in the circumferential direction of the support body (2), extend substantially in the longitudinal direction of the support body (2), and are designed for fastening, respectively, a preferably strip-shaped blade arrangement (5), characterized in that the course of the holding and/or fastening sections (3, 4) in the longitudinal direction of the support body (2) differs from one another at least segment by segment.

2. Knife roll (1) according to claim 1, characterized in that in the longitudinal direction of the support body (2) the holding and/or fastening sections (3, 4) are differently elongated in a partial spiral with at least a stepwise different helix angle with respect to the rotational axis of the support body (2).

3. Knife roller (1) according to claim 1 or 2, characterized in that in the longitudinal direction of the support body (2) the holding and/or fastening sections (3, 4) are elongated straight at different offset angles with respect to the axis of rotation of the support body (2).

4. A knife roll (1) according to any of claims 1 to 3, characterized in that at least one holding and/or fastening section (3, 4) is designed as a groove extending preferably over the entire length of the support body (2).

5. Knife roll (1) according to one of the preceding claims, characterized in that at least one holding and/or fastening section (3, 4) is designed as a flattened planar section which is designed substantially in the manner of a secant in the circumferential direction of the support body (2).

6. A knife roll (1) according to any of the preceding claims, characterized in that the holding and/or fastening sections (3, 4) are arranged distributed substantially symmetrically around the circumference of the support body (2).

7. A knife roll (1) according to any of the preceding claims, characterized in that a blade arrangement (5) is fastened on at least one holding and/or fastening section (3, 4) and that the blade arrangement (5) is formed substantially in correspondence of the holding and/or fastening section (3, 4) in the longitudinal direction of the support body (2).

8. A knife roll (1) according to claim 7, characterized in that the blade arrangement (5) is partly helically or straightly elongated in the longitudinal direction of the support body (2).

9. A knife roll (1) according to any preceding claim, characterized in that a counterweight (15) is fastened to at least one holding and/or fastening section (3, 4).

10. Fastening system comprising a knife roller (1) for cutting a web of material, in particular transversely to a web of material, in particular made of paper, cardboard and/or plastic, wherein the knife roller (1) comprises a support body (2) on the circumference of which at least one holding and/or fastening section (3, 4) is prearranged, which is designed for fastening a preferably strip-shaped blade arrangement (5), in particular comprising a knife roller (1) according to any one of the preceding claims,

-and comprising at least one blade holder fastenable on said holding and/or fastening section (3, 4), wherein said blade holder is designed for holding, as desired, blades (11) elongated at different angles with respect to the axis of rotation of said support body (2), and/or

-comprising at least two blade holders fastenable on holding and/or fastening sections (3, 4) of the support body (2), preferably fastenable on a plurality of said holding and/or fastening sections (3, 4), wherein a first blade holder is designed for holding a first blade (11) and/or is preferably detachably connected to a first blade (11), wherein the first blade (11) is elongated at a first angle relative to the axis of rotation of the support body (2), and a second blade holder is designed for holding a second blade (11) and/or is preferably detachably connected to a second blade (11), wherein the second blade (11) is elongated at another angle relative to the axis of rotation of the support body (1).

Technical Field

The present invention relates to a knife roller for cutting a material web, in particular transversely to a material web, in particular made of paper, cardboard and/or plastic, comprising a support body, for example cylindrical, on the circumference of which a plurality of elongate retaining and/or fastening sections are prearranged, which are spaced apart from one another in the circumferential direction of the support body, extend substantially in the longitudinal direction of the support body and are designed for fastening, respectively, a preferably strip-shaped blade arrangement. Furthermore, the invention relates to a fastening system comprising a knife roller.

Background

Knife rolls of the type described are used, for example, in cross-cutting machines. Such a cross-cutter serves to introduce cuts and/or perforations into the transported continuous web of material transversely to its direction of transport or transport. By means of the transverse cutter, the web of material can be cut one or more times, wherein webs of the same and/or different lengths can be produced from the web of material. Alternatively, the continuous web of material may be provided with one or more transversely elongated perforations. A web of material may refer to a web made of paper, cardboard, plastic or metal film, fabric, and other materials. For example, in the so-called "synchronized cross cutter", two knife rolls are provided, which are arranged one above the other and rotatably in a machine frame, the blades of which, in operation, make cutting engagement in pairs in order to cut off the continuous material web in the transverse direction. "inline cross cutter" has a rotatably arranged knife roller and a stationary blade co-acting therewith. In this so-called "pinch cutting", the blades of the knife roll are in contact with the anvil of the anvil cylinder.

In order to achieve a "travelling" cutting through the web of material from one of its sides to the other, the blades are usually not elongated in the axial direction, i.e. axially parallel with respect to the axis of rotation of the knife roll, but at a so-called offset angle or helix angle with respect to the axis of rotation, so that one of the ends of the blades is offset in the circumferential direction with respect to the other end thereof and is thus always located in a leading position with respect to the other end. In order to achieve such an offset arrangement, a flattened planar section can be formed on the circumference of the, for example cylindrical, support body of the knife roll by a material reduction process, which planar section extends axially parallel to the longitudinal axis thereof in the longitudinal direction of the support body and forms a plane for fastening the strip-shaped blade holder. The plane is flared transversely to the radius and is limited by the leading longitudinal edge and the trailing longitudinal edge in the direction of rotation of the support body. Both of said longitudinal edges extend axially parallel with respect to the axis of rotation of the supporting body from one side thereof to the other. By designing the flattened elongate planar section, one section is cut off from the circumference of the support body, thereby creating a flat plane which makes it possible to simply arrange straight cuboid blade bars at a desired offset angle with respect to the direction of the axis of rotation.

From DE 102005058600 a1, a knife roller of the type mentioned at the outset is known, wherein the knife roller has a cylindrical body, on the circumference of which a flattened, elongate planar section is designed, which differs from its rotational shape and extends substantially in the longitudinal direction of the cylindrical body, on which planar section a strip-shaped blade arrangement extending substantially in the longitudinal direction of the cylindrical body can be fastened. The elongated planar section is substantially partially helically elongated in the longitudinal direction of the cylindrical body, and the strip-shaped blade arrangement may be substantially correspondingly partially helically formed. In the sense of the present disclosure, a "partial spiral shape" is understood to mean that, unlike a full spiral, the helix angle with respect to the direction of the axis of rotation is significantly less than 360 °. By having a planar section which runs essentially partially helically, it is possible in a simple and at the same time flexible manner to adapt the planar section to the shape of the strip-shaped blade arrangement which is later carried by it.

When changing the material web, cutting problems arise with the known knife rolls when carrying out a moving cutting, due to the other web properties and composition of the material web. These cutting problems lead to a higher material reject rate and thus to higher coil manufacturing costs. Hitherto, if cutting problems occur when cutting the material web, the knife roll has been removed and a knife roll with a blade arrangement with blades having different course in the longitudinal direction of the support body has been fitted. However, the replacement of the knife roll is cumbersome and associated with interruptions in the processing of the web of material. Thus, replacement of the knife roll also results in higher coil manufacturing costs.

Disclosure of Invention

The object of the invention is to improve and provide a knife roller of the type mentioned at the outset, which permits the cutting problem to be solved in a structurally simple manner with low effort, wherein in particular the replacement of the knife roller is to be possible. In addition, the object of the invention is to provide a fastening system for fastening a blade, which is elongated at an angle relative to the axis of rotation, to a knife cylinder, which makes it possible to solve the cutting problem with short downtime of the crosscutting machine.

The aforementioned object is achieved by a knife roller having the features of claim 1 and by a fastening system having the features of claim 10. Advantageous embodiments of the invention are the subject matter of the dependent claims.

The present invention relates to a knife roll for the "mobile" cutting of a web of material, in particular transversely of a web of material, in particular made of paper, cardboard and/or plastic, comprising a support body, for example cylindrical, triangular or T-shaped, on the circumference of which a plurality of elongate holding and/or fastening sections are prearranged, which are spaced apart from one another in the circumferential direction of the support body, extend substantially in the longitudinal direction of the support body and are designed for fastening, respectively, a preferably strip-shaped blade arrangement. According to the invention, the knife roller comprises at least two holding and/or fastening sections which are differently elongated in the longitudinal direction of the support body at least segment by segment. The blade arrangement can be fastened simply on the holding and/or fastening faces of the at least two holding and/or fastening sections, while the blades of the blade arrangement have a different course in the longitudinal direction of the support body. In other words, this means: different blade arrangements can be fastened on at least two holding and/or fastening sections of the support body, which are not elongated in the axial direction, i.e. are not elongated axially parallel with respect to the axis of rotation of the knife roll, but are elongated at a specific but different angle with respect to the axis of rotation. Preferably, the holding and/or fastening faces of the holding and/or fastening section also exhibit a correspondingly different course.

Within the framework of the invention, the term "deflection angle" when the holding and/or fastening section is elongated straight or the term "helix angle" when the holding and/or fastening section is elongated partially helically refers to the angle between the axis of rotation of the support body and the orientation of the holding and/or fastening section in the longitudinal direction of the support body. If the cutting edge of the partially helical insert is shown in the unfolded state, a straight line with a constant slope is obtained as a helix, as is known, for example, from screws. For a screw-like or partially helical course of the holding and/or fastening section or of the holding and/or fastening surface, the helix angle refers to the angle between the axis of rotation of the support body and the developing helix. In particular, "skew angle" or "helix angle" refers to the angle between the axis of rotation of the support body and the midline of the retaining and/or securing face of the retaining and/or securing section.

Preferably, the course of the holding and/or fastening section in the longitudinal direction of the support body corresponds to the cutting edge course of the blade connected to the support body by the holding and/or fastening section during cutting.

The cutting forces occurring in a transverse cut increase with decreasing offset angle or helix angle. The force lines vary according to the angle, wherein in particular a suitable angle can be determined according to the material composition and/or the material thickness.

Within the framework of the invention, a skew angle or helix angle in the range of 0.1 ° to 10 °, preferably in the range of 2 ° to 5 °, has proven advantageous. An embodiment is particularly suitable in which in one holding and/or fastening section the offset angle or the helix angle is between 0.1 ° and 5 °, preferably between 0.5 ° and 2 °, more preferably between 1 ° and 1.5 °, and in the other holding and/or fastening section the offset angle or the helix angle is between 1 ° and 10 °, preferably between 2 ° and 8 °. In this way, when the knife rolls are correspondingly equipped with suitable blades, it is possible in the same way to cut distinctly different material webs with the same knife roll in an extremely satisfactory manner.

If cutting problems occur when cutting the material web, such as delamination, scratches on the surface of the material web or surface detachment, and it is necessary to replace the inserted blade with a blade having another course in the longitudinal direction of the support body, the removal of the preset knife roller for the blade is no longer necessary. Rather, the blade arrangement attached to the knife cylinder can be detached or removed from the first holding and/or fastening section of the knife cylinder without the need to detach the knife cylinder. In order to solve the cutting problem, it is therefore possible to fasten or mount a blade arrangement to a further holding and/or fastening section of the knife cylinder, the blades of which have an at least sectionally different course in the longitudinal direction of the support body. In this way, when cutting problems occur which are attributable to a non-optimal blade course in the longitudinal direction of the support body, the process standstill during the material machining can be significantly reduced, which leads to a lower cost of the coil production.

By virtue of the possibility of arranging or fastening blades having different orientations on the knife cylinder as required, the same knife cylinder can be used in a structurally simple manner for different cutting and use purposes, in particular for cutting webs made of different materials, with low effort and short retrofitting times.

Within the framework of the invention, the term "blade arrangement" is to be understood as meaning a preferably strip-shaped blade or a preferably strip-shaped blade holder designed for fastening at least one blade or a combination of both with a blade which is fastened positively and/or non-positively (for example by means of screws) and/or materially (for example by means of an adhesive connection) on the blade holder and/or a blade which is fastenable by means of the blade holder on the support body. The insert holder can be screwed onto the support body and/or clamped or fixed to the support body by means of a clamping element. The blade can be designed as a continuous strip or be composed of a plurality of blade elements arranged one behind the other in the longitudinal direction of the support body.

The insert may be clamped on the insert holder, for example by means of a tensioning device and/or a screw, and/or screwed with the insert holder by tightening the screw, as disclosed for example in EP 0986453B 1. Adhesive attachment may also be preset. A possible embodiment according to the invention is described in EP 0995560 a2, in which the blade is clamped in a gap of the support body by means of a blade holder. In order to clamp the insert in the recess of the support body, a tensioning wedge of the insert arrangement can be inserted therein, which is screwed into the recess.

The blade arrangement may preferably be non-destructively detachably connected with the holding and/or fastening section, for example by mechanical anchoring means, such as tensioning means and/or screws. Moreover, adhesive attachment is not excluded.

The holding and/or fastening section can be designed, for example, as a planar section which is flattened at least in sections over the circumference of the support body. In particular, the holding and/or fastening section can be machined in the support body by a material reduction process. However, it is not excluded that the holding and/or fastening section is designed on and/or in a separate component, which is preferably non-destructively detachably connected, for example screwed, to the support body. The component thus forms a holding and/or fastening section of the knife roller.

The blade arrangement is preferably made of metal and/or metal alloy. The support body is preferably likewise made of metal and/or metal alloy. However, it is also possible to manufacture the support body and/or the blade arrangement from a fiber-reinforced material (e.g. a fiber-reinforced plastic, such as a carbon fiber-reinforced plastic or a fiber composite plastic). It is also possible to manufacture from wood material or from ceramics. In this way, it is possible to achieve a strength and rigidity of the supporting body and/or the blade arrangement sufficient to cut the web of material, depending on the application.

Preferably, the holding and/or fastening section extends over the entire length of the support body. Thereby, the blade arrangement can be fixed to the support body as desired, while the blade arrangement extends over the entire length of the support body. If the blade arrangement extends only over part of the length, the blade arrangement can be fixed on the holding and/or fastening section at different distances from the end of the support body, as required. However, it is also not excluded that the holding and/or fastening section extends only over part of the length of the support body.

In an advantageous embodiment of the invention, it is provided that the plurality of holding and/or fastening sections of the support body, in the longitudinal direction of the support body, are differently elongated in a partial spiral shape with at least a section-wise mutually different slope or different helix angle. Correspondingly, the blade arrangement can also be designed substantially in the shape of a partial spiral and/or be provided for fastening blades having a specific partial spiral course.

Expediently, in the longitudinal direction of the support body, at least two holding and/or fastening sections on the support body are differently elongated in a partial spiral with mutually different slopes over the entire length of the support body.

In the present case, the term "partial spiral" is to be understood as: the rotation performed by the holding and/or fastening section in the circumferential direction of the support body is less than a full rotation around the longitudinal axis of the support body. Preferably, in the circumferential direction or rotational direction of the support body, the retaining and/or fastening section extends around the longitudinal axis of the support body over a circumferential angle of significantly less than 180 °, preferably over a circumferential angle of significantly less than 45 °. In this case, the holding and/or fastening section may have an outer fastening face which, in addition to the twisting about its longitudinal axis, is additionally curved at the offset angle, so that a concavity of the outer fastening face results.

By the partial spiral course of the holding and/or fastening section, an at least substantial weakening of the support body is prevented. The initial strength and stiffness of the support body remains substantially unchanged.

The blade arrangement preferably has a course in the longitudinal direction of the support body which corresponds at least substantially to the course of the holding and/or fastening section. By the partial spiral shape of the blade arrangement, in particular of the cutting edge of the blade, a mobile cutting is achieved. For "mobile cutting", the web of material is cut from side to side. By means of the mobile cutting, the cutting force can be effectively reduced, and thereby the wear of the knife edge and the knife roll can be effectively reduced.

In addition, however, an embodiment is also provided in principle in which the holding and/or fastening section is not elongated in a partial spiral in the longitudinal direction of the support body, but is elongated straight. This allows to secure a straight blade arrangement at a desired offset angle with respect to the direction of the axis of rotation of the support body.

In a further advantageous embodiment, it is provided that the at least one holding and/or fastening section is designed as a groove which preferably extends over the entire length of the support body. In the partially spiral groove, a strip-shaped insert arrangement can be fastened which is curved partially helically in correspondence with the course of the groove. Elements for mechanical fixation and/or for aligning the blade arrangement and/or for fixing and/or aligning the cutting edges of the blades of the blade arrangement may be preset. In this case, for example, a fastening and/or locking screw may be provided. In this case, the screws can preferably be distributed uniformly over the length of the holding and/or fastening section or arranged at equal distances from one another in order to ensure a uniform pressing force when fastening the blade.

However, the groove-shaped holding and/or fastening section can in principle also be designed for accommodating insert arrangements having another course in the longitudinal direction of the support body than the groove-shaped holding and/or fastening section.

By the design of the holding and/or fastening section as a recess in the outer circumference of the support body, in particular as a longitudinally elongated recess in the knife cylinder, the blade arrangement can be fastened to the holding and/or fastening section or therein or to the knife cylinder with low assembly effort and time expenditure. Here, the groove may serve as a guide, simplifying the positioning of the blade arrangement. It is thus possible, for example, to fit the blade arrangement vertically (in the radial direction) from the outside into the groove. However, it is also possible to push the blade arrangement into the holding and/or fastening section in the longitudinal direction of the support body. In contrast, when the blade arrangement is replaced, it can be lifted vertically out of the recess or pulled out or removed from the holding and/or fastening section in the longitudinal direction.

The grooves can be machined in the support body of the cutter roll or in the peripheral surface of the support body by a subtractive process, in particular by milling. The depth of the groove may preferably be in the range of 2 to 100mm, preferably in the range of 2 to 50 mm. Thereby, a secure clamping of the blade arrangement is ensured and a high material reduction is avoided.

Particularly preferably, the holding and/or fastening section is designed as a longitudinally elongated groove in the outer circumference of the support body and has at least in sections mutually different course in the longitudinal direction of the support body. Particularly preferably, at least two grooves are provided which show different partially helical course in the longitudinal direction of the support body. In this way, blades having different orientations in the longitudinal direction of the support body can be easily held or fastened on the knife cylinder. In this connection, it is also possible to provide straight grooves and at least one groove as a retaining and/or securing section in the knife cylinder, which groove does not run straight in the longitudinal direction of the knife cylinder, but in particular runs in a partial spiral.

Alternatively, the at least one holding and/or fastening section can be designed as a flattened planar section, as described in DE 102005058600, which forms a cut line that interrupts the otherwise circular cross section of the support body. In this way, a simple and cost-effective design of the holding and/or fastening section on the support body is possible. There is no need to machine any complex geometric shapes, such as arrises or rounded surfaces, in the support body. More precisely, the support body can be machined with uniform mechanical reduction along a plane, preferably by milling. The blade arrangement fastenable on the holding and/or fastening section of the secant-like design may be elongated straight in the longitudinal direction and is designed for fastening straight elongated blades. In principle, it is also possible to fasten a blade arrangement designed for receiving a partially helical blade on a holding and/or fastening section of secant-like design, for example by means of suitable tensioning elements and/or spacers.

Other possible design features of the holding and/or fastening section are shown and described in DE 102005058600.

In a further preferred embodiment, the holding and/or fastening sections may be arranged substantially symmetrically distributed over the circumference of the support body. In particular, a uniform circular movement of the knife roller during the cutting process can thereby be achieved.

As already described above, the orientation of the blade arrangement and in particular of the cutting blade in the longitudinal direction of the support body can be adapted to the orientation of the holding and/or fastening section. A stable fastening of the blade arrangement on the holding and/or fastening section is thereby possible. For a corresponding course of the holding and/or fastening section, the blade arrangement may be elongate in the longitudinal direction of the support body, thus for example partially helically, or straight at an offset angle to the direction of the axis of rotation of the support body.

As already described above, in the operating state of the knife roller, i.e. during the cutting process, the blade arrangement may preferably be fastened on only one holding and/or fastening section. Preferably, a counterweight can be fastened to at least one further holding and/or fastening section. By the counterweight, the center of mass of the knife roll is displaced. Preferably, the counterweight is fastened to the holding and/or fastening section and/or has a geometry and/or mass such that the knife roller rotates substantially around its centre of mass when cutting the web of material. Through the uniform circular motion, energy can be saved in the operation process of the knife roller. Furthermore, the mechanical load of the blade when cutting is reduced, wherein the service life of the blade arrangement is increased.

Suitably, the holding and/or fastening section is connected with the blade arrangement, wherein a counterweight is fastened on the remaining holding and/or fastening section of the knife roll, respectively.

An alternative embodiment of the invention relates to a fastening system comprising a knife roller, in particular of the type described before, and comprising at least one blade holder fastenable on at least one holding and/or fastening section of a supporting body of the knife roller, wherein the blade holder is designed for holding blades elongated at different skew angles or helix angles with respect to the axis of rotation of the supporting body, as required. The foregoing aspects are again useful in avoiding replacement of the knife rolls in the event of cutting problems. This alternative embodiment relates to the use of a blade holder which is likewise designed and arranged for holding a plurality of different blades, i.e. blades having different runs in the longitudinal direction of the support body. Tensioning means, spacing means or fastening means such as screws may be used to fasten different blades on the same blade holder as required. The blade holder itself is fastened on a holding and/or fastening section of the support body of the knife roll, preferably as described above in relation to the knife roll according to the invention.

A further alternative embodiment of the invention relates to a fastening system comprising a knife roller, in particular of the type described above, which knife roller comprises at least two blade holders that can be fastened on at least one holding and/or fastening section of the support body, preferably on a plurality of holding and/or fastening sections of the support body, wherein the first blade holder is designed for holding a first blade or is preferably detachably connected to the first blade, while the first blade is elongated at a first offset angle or a first helix angle relative to the axis of rotation of the support body, and the second blade holder is designed for holding a second blade or is preferably detachably connected to the second blade, while the second blade is elongated at a further second offset angle or a second helix angle relative to the axis of rotation of the support body. This embodiment involves the use of at least two differently designed blade holders which respectively carry or hold the blades, wherein the blades of the two blade holders differ with respect to their course in the longitudinal direction or with respect to their respective offset or helix angle with respect to the axis of rotation of the support body. For fastening the blade holder, two differently designed holding and/or fastening sections can be provided on the support body, preferably as described above in connection with the knife roller according to the invention. However, it is also possible in principle to provide only one retaining and/or fastening section for fastening the blade holder. The blade holder is therefore likewise designed and provided for fastening on demand on the same holding and/or fastening section of the support body.

Further advantages, features, characteristics and aspects of the invention emerge from the claims and the following description of a preferred embodiment, which is based on the drawings. The described and/or illustrated advantages, features, characteristics and aspects of the invention may be combined with each other as desired, even if this is not described or illustrated in detail. The numerical ranges given include the median of all integers.

Drawings

In the drawings:

fig. 1 shows a perspective view of a knife roll according to the invention, comprising two holding and/or fastening sections arranged equidistantly on a, for example, cylindrical, support body of the knife roll, wherein the helix angle of the partly helical holding and/or fastening sections is diagrammatically shown,

figure 2 shows a representation of the unrolling of the holding and/or fastening section of the knife roll shown in figure 1 in relation to the middle line of the holding and/or fastening section,

fig. 3 shows a cross-sectional view of another embodiment of a knife roll according to the invention, in which the blades are clamped in a holding and/or fastening section, and

fig. 4 shows a schematic view of another embodiment of a knife roll according to the invention, comprising a blade arrangement and a counterweight preset opposite the blade arrangement.

Detailed Description

In the following description, the same reference numerals are used for the same and similar components, wherein corresponding features and characteristics are obtained even if the description is not repeated.

Fig. 1 shows a perspective view of a knife roll 1 according to the invention for cutting a web of material, in particular transversely to a web of material, in particular made of paper, cardboard and/or plastic, comprising a cylindrical support body 2. The knife roll 1 is used in particular in a crosscutting machine for manufacturing rolls from a paper web or a cardboard web. Such a transverse cutting machine usually comprises two knife rolls 1 which are mounted one above the other in a frame so as to be rotatable and whose blades, in operation, come into cutting engagement in pairs.

On the circumference 2a of the support body 2, the first (front according to fig. 1) and the second (rear according to fig. 1) holding and/or fastening section 3 and 4 are each designed as a groove-shaped recess. The two holding and/or fastening sections 3, 4 are arranged oppositely on the support body 2 and are distributed substantially equidistantly on the circumference 2a of the support body 2. The groove bottoms of the two recesses form two holding and/or fastening surfaces 3a, 4a of the two holding and/or fastening sections 3, 4. The retaining and/or fastening faces 3a, 4a are designed and preset for fastening a blade arrangement 5, which is differently elongated in the longitudinal direction of the support body 2, on the support body as desired.

The holding and/or fastening section 3 has a leading longitudinal edge and a following longitudinal edge in the direction of rotation of the support body 2, which have the same course in the longitudinal direction of the support body 2 and thus are elongated parallel to one another. The holding and/or fastening surface 3a has a center line or spiral 17, which preferably corresponds to the course of the cutting insert 11, in particular to the course of the cutting edge, which can be fastened in the holding and/or fastening section 3 (see fig. 3).

If the spiral 17 is displayed in the unfolded state, a straight line corresponding to the slope of the spiral 17 is obtained (unfolded spiral 18 according to fig. 2). Hereinafter, the angle between the rotation axis of the support body 2 and the uncoiled helix 18 is referred to as helix angle γ.

The abscissa of the coordinate system shown in fig. 2 gives the extension of the unfolded spiral 18 in the circumferential direction of the support body 2, while the ordinate corresponds to the length of the unfolded spiral 18 in the longitudinal direction of the support body 2. The helix angle γ corresponds to the angle between the ordinate (the longitudinal axis of the support body 2) and the developing helix.

Not shown are: the holding and/or fastening section 3 may alternatively also be designed as a groove which is elongated straight in the longitudinal direction of the support body 2.

18 the retaining and/or fastening section 3 extends over only a part of the circumference of the support body 2. As can be seen from fig. 1 and 2, the rotation performed by the helix 17 is less than a full rotation around the axis of rotation of the support body. The helix 17 preferably extends over less than half of the circumference, preferably over less than a quarter of the circumference of the support body 2. The value n in fig. 2 is therefore greater than 1, preferably greater than 2, preferably greater than 4. Advantageously, the helix angle γ corresponds to a value between 0.1 ° and 10 °.

The retaining and/or fastening face 4a of the second retaining and/or fastening section 4 is elongated over the circumference 2a of the support body 2 at a further helix angle γ different from the retaining and/or fastening face 3a of the opposite first retaining and/or fastening section 3. This makes it possible to fasten a blade arrangement 5 on the support body 2, which blade arrangement has a different (partially helical) course in the longitudinal direction of the support body 2.

In fig. 3, a further embodiment of a knife roll 1 according to the invention is shown, which comprises two different holding and/or fastening sections 3, 4. The groove-shaped voids in the circumference 2a of the support body 2 have a first side wall 7 and a second side wall 8, respectively, which are spaced apart from each other in the circumferential direction of the support body 2. The side walls 7 and 8 preferably open into one another in a wedge-shaped manner, wherein the groove depth in the radial direction is defined by the groove bottom 9. The two holding and/or fastening sections 3, 4 thus have a trapezoidal cross section. At least one threaded bore 10, which is oriented substantially perpendicularly to the groove base 9, is provided in the groove base 9. The steel strip 16 can be inserted into the recess, for example, on one side, on both sides, on the bottom side or also internally.

According to fig. 3, the blade arrangement 5 is fastened or held in the second holding and/or fastening section 4. The blade arrangement 5 is composed of a blade 11 and a tensioning element 12 which is designed substantially complementary to the groove-shaped holding and/or fastening section 4. In cross section, the tension element 12 has a substantially trapezoidal shape. The tensioning element 12 has at least one through hole through which a screw 13 is guided, which is screwed into a threaded hole 10 in the support body 2. The tensioning element 12 is pulled into the groove-shaped retaining and/or fastening section 4 by the screw 13. In the longitudinal direction of the holding and/or fastening section 4, preferably a plurality of screw connections are foreseen, more preferably arranged mutually equidistant. By tightening the screw 13 the blade 11 is caught and fixed in its position. In order to be able to adjust the blade 11 even better, a set screw 14 can be provided, which acts perpendicularly on the side of the blade 11 facing away from the tensioning element 12, as is shown in fig. 3. Likewise, the blade arrangement 5 may alternatively be fastened in the first holding and/or fastening section 3. The exemplary selected embodiment described previously preferably relates to an upper blade axle comprising an adjustable blade 11. Conversely, the blade 11 can also be clamped on the lower blade shaft in a non-adjustable manner. The previously described fastening of the blade arrangement 5 on the holding and/or fastening section 4 is therefore to be understood by way of example and is not limited to the described fastening means.

To achieve mobile cutting, the blade arrangement 5 (i.e. the blades 11) is not elongated axially parallel with respect to the rotational axis of the support body 2, but at a helical angle with respect to the rotational axis of the support body 2. Preferably, the blade 11 has the same course in the longitudinal direction as the holding and/or fastening section 4. The holding and/or fastening sections 3, 4 are partially helically elongated at a helix angle γ with respect to the longitudinal axis of the support body, corresponding to the orientation of the blade 11. The holding and/or fastening sections 3, 4 also have mutually different orientations in the longitudinal direction.

If problems arise during cutting, which may occur, for example, during the exchange of material, or if another cutting is to be carried out, it is possible to simply and in a short time change the used blade arrangement 5 to another blade arrangement 5 having another (partially helical) course. The knife cylinder 1 does not need to be removed from the crosscutting machine for this purpose. It is sufficient to remove the used blade arrangement 5 from the holding and/or fastening section 3, 4 and to mount a blade arrangement 5 having a different longitudinal course on the other holding and/or fastening section 4, 3. In this way, the downtime of the crosscutting machine attributable to the replacement of the blade arrangement 5 when cutting problems occur can be reduced, since the troublesome replacement of the knife cylinder 1 is dispensed with.

As shown in fig. 3, for operation of the knife roll 1, preferably a blade arrangement 5 is fastened on only one of the two holding and/or fastening sections 3, 4.

Fig. 4 shows a further embodiment of a knife roller 1 in a cross-sectional view, which comprises two holding and/or fastening sections 3, 4 opposite one another on its circumference 2 a. As can be seen from fig. 4, flat surface sections, which are flattened out and extend in the longitudinal direction of the support body 2, which form retaining and/or fastening surfaces 3a, 4a, are each provided essentially opposite one another on the circumference 2a of the support body 2, which flat surface sections differ from their rotational shape. The holding and/or fastening faces 3a, 4a are designed as strips and are designed substantially straight or flat in cross section in order to be able to accommodate with their bottom face an insert arrangement 5 which is only schematically shown. The holding and/or fastening faces 3a, 4a thus produce a cut in the cross section of the support body 2, which cut interrupts the circular cross section of the support body 2 and forms a section which extends axially parallel or possibly partially helical in the longitudinal direction of the support body 2 relative to the axis of rotation of the support body 2, in order to fasten the blade arrangement 5. The holding and/or fastening faces 3a, 4a make it possible to fasten a straight elongated blade of the blade arrangement 5 on the support body 2 at an offset angle relative to the axis of rotation of the support body 2 or, if necessary, also at a helix angle relative to the axis of rotation of the support body 2, fastening a partially helically elongated blade of the blade arrangement 5.

The retaining and/or fastening surfaces 3a, 4a can be delimited at one longitudinal edge or at both longitudinal edges by lateral shoulders 6. Thereby, in the fastened state, the blade arrangement 5 preferably abuts against the shoulder 6. The shoulder 6 facilitates the positioning of the blade arrangement 5 on the holding and/or fastening sections 3, 4. Thus, the mounting of the blade arrangement 5 can be performed in a short time and with little trouble.

As shown in fig. 4, a blade arrangement 5 is fastened on the first holding and/or fastening section 3. In fig. 4, the blade arrangement 5 is only schematically shown, which may comprise a strip-shaped blade 11, a strip-shaped blade holder or a blade 11 fastened on a blade holder. The blade arrangement 5 is fastened to the support body 2 by means of a mechanical fastening device, not shown. Preferably, the blade arrangement 5 is fastened using a fastening screw. Alternatively, other detachable connection means are possible. Furthermore, it is also possible to additionally or alternatively glue the blade arrangement 5 with the holding and/or fastening section 3.

A schematically illustrated counterweight 15 can be fastened to the second holding and/or fastening section 4. Preferably, the counterweight 15 is configured such that during cutting the knife roller 1 rotates substantially about its centre of mass. By arranging the counterweight 15 opposite to the blade arrangement 5, unbalance of the knife cylinder 1 during operation can be reduced and the service life of the knife cylinder 1 can be extended.

List of reference numerals:

1 knife roll

2 support body

2a circumference

3 holding/securing section

3a holding/fastening surface

4 holding/securing section

4a holding/fastening surface

5 blade arrangement

6 convex shoulder

7 side wall

8 side wall

9 groove bottom

10 screw hole

11 blade

12 tensioning element

13 screw

14 calibration screw

15 balance weight

16 steel belt

17 helix

18 spiral.