EP2974836A1 - Ring knife module and longitudinal cutting system - Google Patents

Abstract

The invention relates to a ring knife module for a slitting system for a sheet material. In this case, at least one ring knife (15) and a shaft (14), in particular expansion shaft, provided for attaching and releasably fixing the at least one ring blade (15). At least one positioning device (35) serves to displace the at least one ring blade (15) on the shaft (14). The invention is characterized in that the positioning device (35) has at least one gripping element (36) for gripping the at least one ring knife (15).

Description

The invention relates to a ring knife module for a slitting system according to the preamble of claim 1. Furthermore, the invention relates to a slitting system according to the preamble of claim 15.

A longitudinal cutting system is used for the longitudinal division of web-shaped materials. These sheet-like materials may be, for example, paper, foil, composites and the like. By a longitudinal division, the web-shaped material is divided into several narrower strips or bands, in particular by cutting.

Depending on material, type and requirements different cutting methods can be used. For example, shear or squeezing methods can be used. In the case of a shear cut, two overlapping blades cut the material. A squish is usually performed by rolling a knife on a roller. The material in between is displaced and thus severed.

Typically, the knives used are circular knives which are rotatably mounted on a central axis. The sheet material is in the Usually rolled up and unrolled for cutting in the machine for longitudinal cutting as an elongated web.

This web accordingly passes through a cutting area. This is located between one or more above the web arranged knives, so-called upper knives, on the one hand and below the web arranged counter-bearings, such as knives, so-called lower blades, or other counter-bearings for the knife on the other. Depending on the cutting method can be used as an abutment instead of the lower blade, for example, a smooth roller, for example, in the Quetschschnittverfahren. Basically, a vertically reversed arrangement is possible, so knife down and counter bearing above.

In the case of shear cutting, relatively thin circular blades are usually used as the upper blade. As a lower blade usually also circular knives are used, which have at least one peripheral edge, where the respective upper blade for shearing the material comes to rest. Usually, a lower blade is provided per upper blade to allow exact positioning. But it can also cooperate with several upper knife with a lower blade.

The lower blades are usually arranged side by side on a common shaft. For this purpose, the knives are designed as so-called ring knives. The diameter of the shaft is therefore usually slightly smaller than the circular recess of the ring diameter. In order to fix the ring knives fixed on the shaft, the shaft is usually designed as a so-called expansion shaft. Accordingly, at least one so-called expansion means or expansion element is provided. Expansion elements can be operated both mechanically by means of adjustment or spring action as well as hydraulically or pneumatically by means of pressure hoses. An attached to the shaft ring knife is braced by an expansion of the shaft or there arranged expansion elements on the shaft. Accordingly, the shaft can also be referred to as a tensioning shaft and the expansion elements can also be referred to as tensioning elements.

In order to enable an exact positioning of the ring knives on the shaft, they must be moved by a suitable positioning on the shaft. The known positioning devices engage with one or two protruding pin-like projections in the ring diameter. By shifting the positioning along the longitudinal axis of the shaft thus the ring knives can be moved along this shaft.

The disadvantage here is that it comes to tilting by inclinations of the knife on the shaft. A low-friction and exact positioning is hardly possible.

The object of the invention is therefore to provide a ring knife module for a slitting system for a web-shaped material and a corresponding slitting system, with which an exact positioning of the ring knife is made possible.

A ring knife module with the features of claim 1 solves this problem. It is characterized in that the positioning device has at least one gripping element for gripping the ring knife. This allows safe handling of the ring diameter by the gripping element. The ring knife is accordingly held by the gripping element. The ring knife is therefore securely gripped and transported to the desired position. In the prior art, however, it is only guided by the positioning and more or less moved to the correct position. Canting prevents exact positioning. The solution according to the invention offers the advantage that tilting of the ring blade on the shaft is prevented.

The gripping element is preferably detachably connectable to the ring knife. The ring knife and the gripping element preferably form a unit, in particular a solid unit. This means that the gripping element can be moved together with the associated ring knife. By gripping the ring knife is independent of the leadership of the shaft movable. This is not possible in the prior art, where only a guide of the ring diameter on the shaft is made possible. In particular, the ring knife and the gripper element are movable together as a unit in several, in particular all spatial directions. This allows an exact and virtually any positioning of the ring diameter on the shaft.

More preferably, the gripping element is designed in several parts. Preferably, the gripping element has a plurality, in particular relatively movable gripping element parts. These gripping element parts make it possible to grasp the ring knife. Thus, there is a storage of the ring knife on the gripping element. For this purpose, various gripping element parts which are movable relative to one another are required. Especially Preferably, at least two jaws are provided. These jaws serve to engage with the ring knife.

The gripper element parts are in particular movable parallel to one another. Preferably, the distance between at least a part of the gripping element parts is variable to one another. Such a parallel movability or parallel displacement of the gripper element parts relative to one another serves to enable grasping and supporting the ring blade. The parallel displacement takes place in particular in the region of individual sections or parts of the gripper element parts. Particularly preferably, for example, the jaws can be moved parallel to each other. In particular, the distance is varied.

Preferably, the gripping element is formed at least corresponding to a part of the ring knife. Preferably, this is a circular segment-like subarea. In order to enable a secure connection between the gripping element and the ring knife, a tailor-made training is required. Since the ring knife has a circular outer shape, accordingly, the gripping element or the gripping element parts are formed accordingly. Preferably, a circular cutout, that is to say preferably between a quarter circle and a half circle, ie between 90 ° and 180 °, is required, in order to allow a stable mounting of the ring knife.

Particularly preferably, the gripper element parts are clamped with the ring diameter. The bracing is done in particular with a recess and / or a projection of the ring diameter. The ring knife usually has a plurality of circumferential groove-shaped recesses or grooves. In such a recess, the gripper element parts are sure to engage in order to be clamped there. This means that, for example, two gripper element parts are introduced into the recess and clamped in the recess. The same can also be done with a projection on which the gripping member parts can also be clamped. In this case, clamping means in particular that the gripping element parts are moved with force against each other or apart. They are then brought into abutment with a recess or with a projection of the ring knife and held there by force and frictional force. This makes it possible that existing components of the ring diameter, in particular the recesses or projections, can be used to achieve a storage of the ring diameter.

Particularly preferably, the gripping element parts each have at least one protruding section. These sections are adapted to be brought to bear on one of the side surfaces of a recess or a projection of the ring diameter. The sections are brought into contact in particular under pressure or by clamping with the side surfaces of the recesses or the projection. This ensures that a firm connection between the ring knife and the gripping element is made possible. Thus, a secure storage of the ring knife is possible.

Preferably, the gripping element or its jaws are clamped in a groove of the ring diameter. This clamping is preferably carried out by moving apart of the jaws. Thus, a two-way moving is achieved on the side surfaces of the groove.

The jaws are preferably at least partially arcuate and / or formed at least about a quarter circle spanning. This ensures a safe contact with the knife.

The jaws are particularly preferably formed interrupted sections. Preferably, a bearing of the ring blade is provided at at least three points or portions of the jaws, in particular each of the jaws. A three-point bearing enables a particularly stable and accurate positioning of the ring knives.

The gripping element is in particular displaceable at least along the shaft. This serves to achieve an accurate positioning of the at least one ring knife. However, the gripping element is preferably not mounted on the shaft itself, but separately. Thus, the shaft is still freely rotatable. But by a displacement along the entire length of the shaft is made possible, the gripping element can position the at least one ring knife arbitrarily on the shaft.

The gripping element is further preferably movable in several axes relative to the shaft or to the ring blade. For this purpose, the positioning device preferably has a multiaxial adjusting device for the gripping element. This ensures that the gripping element is not only movable along the axis of the shaft, but also perpendicular thereto in both directions. This allows an exact guidance of the Ring knife over the shaft can be achieved, in particular without touching the shaft or without unnecessary frictional forces and the like.

The above-mentioned object is also achieved by a longitudinal cutting system with the features of claim 15. This includes a ring knife module according to the above statements. Such a longitudinal cutting system is designed in particular for use with cutters. These shearing blades as upper blades have corresponding ring knives as counterparts and lower blades.

Fig. 1

ein Längsschneidsystem mit einem erfindungsgemäßen Ringmessermodul in einer perspektivischen Ansicht,

Fig. 2

eine frontale Schnittansicht durch das Längsschneidsystem der Fig. 1,

Fig. 3

das erfindungsgemäße Ringmessermodul in einer detaillierten, perspektivischen Darstellung,

Fig. 4

einen ausschnittsweise Frontansicht einer erfindungsgemäßen Positioniereinrichtung mit einem Greifelement,

Fig. 5

eine Schnittansicht durch eine Expansionswelle mit Ringmesser und Greifelement,

Fig. 6

eine perspektivische Ansicht eines Greifelements einer erfindungsgemäßen Positioniereinrichtung,

Fig. 7

eine Seitenansicht des Greifelements der Fig. 6, und

Fig. 8

eine Seitenansicht aus anderer Perspektive des Greifelements der Fig. 6.

A preferred embodiment of the invention will be described below with reference to the drawings. In this show:

Fig. 1

a longitudinal cutting system with a ring knife module according to the invention in a perspective view,

Fig. 2

a frontal sectional view through the longitudinal cutting system of Fig. 1 .

Fig. 3

the ring gauge module according to the invention in a detailed, perspective view,

Fig. 4

1 is a fragmentary front view of a positioning device according to the invention with a gripping element,

Fig. 5

a sectional view through an expansion shaft with ring knife and gripping element,

Fig. 6

a perspective view of a gripping element of a positioning device according to the invention,

Fig. 7

a side view of the gripping element of Fig. 6 , and

Fig. 8

a side view from another perspective of the gripping element of Fig. 6 ,

In Fig. 1 an inventive longitudinal cutting system is shown. The longitudinal cutting system 10 serves to divide a web-shaped material 11 into narrower strips 12, that is to say to cut longitudinally.

For this purpose, the web-shaped material 11 is guided horizontally through the longitudinal cutting system 10 by means of a plurality of rollers 13 or shafts 15. The rollers 13 and shafts 14 are mounted in a frame 17. This frame 17 has two side parts 18 and 19, which are connected by means of two bottom-side struts 20. On the floor side feet 21 are also provided, which may be provided with damping elements such as springs.

Above the rollers 13 or shafts 14, the actual cutting device 22 is arranged. This includes a holding device 23, which serves for the storage of knife holders 24. Each knife holder 24 has at least one knife 25. These knives 25 are used to cut the sheet material 11 into a plurality of strips 12. By having a plurality of knives 25 arranged side by side, a plurality of longitudinally extending strips 12 can be cut from the sheet material 11 at the same time.

The knives 25 may be different types of knives, depending on the purpose and material. In the present case, a longitudinal cutting system 10 is described with a shear cut as a cutting process. The upper blades 25 are formed as a shearing blade. The knives 25 are each mounted in a knife holder 24. The knife holder 24 in turn inserted in a holding device 23 and fixed and positioned there. For inserting the knife holder 24 into and positioning the knife holder 24 in the holding device 23 is a handling device 26th

The knives 25 are equipped as circular blades with a thin circular blade 27. In order to enable a shear cut, the knives 25 cooperate with corresponding lower ring knives 15. This is especially in section E of Fig. 2 to recognize. The upper knife 25 abuts against a side edge of an edge of the ring blade 15. The ring knife 15 has a plurality of recesses in the form of grooves 28. These may alternatively be used to engage the upper shear blade 25. Since the knife 25 is pressed by a spring to the side edge of the groove 28 of the ring knife 15, a run between ring knife 15 and upper knife 25 web-shaped material 11 is cut into strips 12.

In Fig. 3 is the ring knife module 16, which is already in the Fig. 1 and 2 is shown in overview, shown in detail. The essential component is the shaft 14, which is designed here as an expansion shaft. A series of ring knives 15 is on this shaft 14 plugged. The circular cutout of the annular blades 15 serves this purpose. The shaft 14 has a plurality of expansion elements 30 for fixing the ring blades 15. As in particular in the Fig. 5 can be seen, several, as here, for example, three expansion elements 30 may be evenly distributed over the circumference of the expansion shaft 14. Accordingly, the three expansion elements 30 are arranged here at an angle of 120 °.

The ring knife 15 is braced by the activated expansion elements 30 on the shaft 14. For this purpose, the expansion elements 30 exert an outwardly directed pressure on the inside of the ring knives 15. This can be done, for example, by pneumatic or hydraulic pressurization or by mechanical adjustment of the expansion elements 30 to the outside.

In order to move the ring knives 15 on the expansion shaft 14, a deactivation or release of the expansion elements 30 is required. For this purpose, for example, the pressure can be released or carried out a mechanical adjustment of the expansion elements 30 to the inside.

By providing a precise fit of the ring knives 15 on the shaft 14, the ring knives 15 can be held in position even when the expansion elements 30 are deactivated. For this purpose, for example, an elastic material 31, such as in particular a plastic or rubber, may be provided in the region of the expansion elements 30. By the elastic material 31 is mounted on the surface of the expansion elements 30, it can come into contact with the ring knife 15 and prevent them from slipping. The elastic material 31 then has to project at least slightly beyond the circumference of the cylindrical body of the expansion shaft 14 for this purpose. Due to such a material, a small holding force is exerted on the ring blades 15 so as to prevent slippage. The ring knives 15 remain in this case, even with deactivated expansion elements at their position on the shaft 14. Alternatively, a slight activation of the expansion elements 30 remain.

The shaft 14 is driven by a motorized rotary drive 32 so that it can be rotated in rotation about its longitudinal axis. Furthermore, a height adjustment by means of a vertical drive 33 may be possible. This vertical drive 33 operates in particular pneumatically. For this purpose, the ring knife module 16 is mounted vertically by means of rails 34.

For positioning the ring knives 15 on the shaft 14, a positioning device 35 is provided. This positioning device 35 has a gripper or a gripping element 36. The gripping element 36 in this case again comprises two clamping jaws 37. The two clamping jaws 37 are adjustable relative to one another by means of a clamping jaw drive 38.

The positioning device 35 is also adjustable along the longitudinal axis of the shaft 14 by means of a horizontal drive 39. For this purpose, a screw 40, which is designed here as a play-free ball screw. Thus, the entire gripper 36 can be adjusted along the longitudinal axis of the expansion shaft 14. In addition, a vertical drive 44 is still provided, which serves for the height adjustment along a rail 45.

The jaws 37 are formed as circular segment-shaped projections. At each of the two gripping element parts 41 and 42, the respective clamping jaws 37 are formed as projections. Since their shape corresponds at least in sections to the shape of the grooves 28 in the ring knives 15, the clamping jaws 37 can engage directly in one or more of these grooves 28. This is for example in Fig. 4 shown.

By means of the jaw drive 38, the movable gripper element part 42 can be adjusted relative to the stationary gripping element part 41. For this purpose, it is therefore parallel to the gripping member 41 along the longitudinal axis of the shaft 14 to the right and left in the plane of the drawing Fig. 4 movable. This ensures that the two projections in the form of the jaws 37 in a groove 28 of the ring blade 15 can be moved apart or together. By moving apart can thus be done in a groove 28 bracing. For this purpose, the clamping jaws 37 are moved to the left or right to the side surfaces of the groove 28 and pressed. Due to the approximately a quarter circle spanning training of the jaws 37 a stable and complete storage of the ring diameter 15 is achieved. Alternatively, a bracing of a projection of the ring blade 15 by means of the clamping jaws 37 reach. These are moved together and braced laterally.

Due to the adjustment possibilities of the gripping element 36, the ring knives 15 can be displaced virtually along the entire shaft 14. The positioning of the ring knives 15 is usually carried out to match the upper knives 25. Here, a corresponding contact of the blades 27 must be made on the corresponding side surfaces of the grooves 28 to allow a clean cut. The positioning along the longitudinal axis of the shaft 14 is typically computer controlled. The Position detection is preferably via absolute value encoder. Due to a corresponding positioning of the gripping element 36 then corresponds to the position of the ring diameter 15 corresponding to the position of the upper blade 25. The upper blade 25 can be moved by means of the handling device 26 to the appropriate location in the holding device 23.

As an alternative to a clamping of the clamping jaws 37 in a groove 28, a clamping and thus a gripping of a projection 43 can alternatively take place. In this case, the jaws 37 are not moved apart by the jaw drive 38 for clamping, but instead moved toward each other or together. A release of the tension is then possible in each case by the opposite movement.

As an alternative to the uninterrupted circular segment of the clamping jaws 37 shown here, these can also be interrupted in sections, for example. The decisive factor is essentially a storage by bracing at least three points or a correspondingly large area storage, so as to achieve a secure gripping of the respective ring blade 15. LIST OF REFERENCE NUMBERS 10 slitting system 37 jaw 11 web-shaped material 38 jaw drive 12 strips 39 horizontal drive 13 roller 40 ball screw 14 wave of expansion 41 gripping element part 15 ring knives 42 gripping element part 16 ring knife module 43 lead 17 frame 44 vertical drive 18 side panel 45 rail 19 side panel 20 strut 21 pedestal 22 cutting device 23 holding device 24 knife holders 25 knives 26 handling device 27 blade 28 groove 30 expansion element 31 elastic material 32 rotary drive 33 vertical drive 34 rail 35 positioning device 36 gripping element

Claims (15)

Ring knife module for a longitudinal cutting system (10) for a web-shaped material (11), with at least one ring knife (15) and a shaft (14), in particular expansion shaft, for mounting and releasably fixing the at least one ring knife (15), and with at least one positioning (35) for displacing the at least one ring knife (15) on the shaft (14), characterized in that the positioning device (35) has at least one gripping element (36) for gripping the at least one ring knife (15). Ring knife module according to claim 1, characterized in that the gripping element (36) with the ring knife (15) is releasably connectable, in particular such that the ring knife (15) and the gripping element (36) form a unit, in particular a fixed unit. Ring knife module according to claim 1 or 2, characterized in that the ring knife (15) and the gripping element (36) are movable together, preferably in several, in particular all spatial directions. Ring knife module according to one of the preceding claims, characterized in that the gripping element (36) is designed in several parts, preferably a plurality of relatively movable gripping element parts (41, 42). Ring knife module according to one of the preceding claims, characterized in that the gripping element parts (41, 42) are movable parallel to each other, wherein preferably the distance of at least a part of the gripping element parts (41, 42) is variable. Ring knife module according to one of the preceding claims, characterized in that the gripping element (36) is formed at least corresponding to a portion of the ring knife (15), preferably a circular segment-like portion. Ring knife module according to one of the preceding claims, characterized in that the gripping element parts (41, 42) with the ring knife (15) are clamped, in particular with a recess, such as a groove (38), and / or a projection of the ring blade (15), preferably on both sides of the recess and / or the projection. Ring knife module according to one of the preceding claims, characterized in that the gripping element parts (41, 42) each have at least one preferably protruding section for gripping the ring knife (15), in particular at least one clamping jaw (37). Ring knife module according to claim 8, characterized in that the sections and / or clamping jaws (37) on each side surface of a recess or a projection of the ring blade (15) can be brought into abutment, preferably with it clamped. Ring knife module according to one of the preceding claims, characterized in that the gripping element (36) or its clamping jaws (37) in a groove (28) of the ring blade (15) are clamped, preferably by moving apart. Ring knife module according to one of the preceding claims, characterized in that the clamping jaws (37) are at least partially arcuate and / or formed at least about a quarter circle spanning. Ring knife module according to one of the preceding claims, characterized in that the clamping jaws (37) are formed interrupted in sections, wherein preferably a bearing of the ring blade (15) at least three points or sections of each of the clamping jaws (37) is provided. Ring knife module according to one of the preceding claims, characterized in that the gripping element (36) at least along the shaft (14) is displaceable for positioning of the at least one ring blade (15). Ring knife module according to one of the preceding claims, characterized in that the gripping element (36) in several axes relative to the shaft or the ring knife (15) is movable, wherein the positioning device (35) preferably has a multi-axis adjustment for the gripping element (36). Longitudinal cutting system with a ring knife module (16) according to one of the preceding claims.

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