Patent Application
20200281348
The following documents are incorporated herein by reference as if fully set forth: German Patent Application No. 10 2019 105 877.5, filed Mar. 7, 2019.
The invention relates to a shearing device having a blade and having a counterpart blade assigned to the blade, a brush production machine having a shearing device of said type, and the use of a shearing device for cutting bristle filaments to length.
In the production of brushes, it is often necessary for bristle filaments to be shortened or cut into shape. In particular in the case of the machining of brush bodies that have already been equipped with bristles, shearing devices with fly cutters are often used in practice. Shearing devices with fly cutters are already known for example from the documents DE 39 41 738 A1, DE 195 09 063 A1 and DE 195 28 834 B4.
The document DE 10 2012 018 636 B3 has already disclosed a shearing machine for shearing textile material for shearing. The shearing machine has a band knife with a cutting edge which faces toward a shearing cylinder of the shearing machine during the shearing process. Here, the band knife passes from a master cassette and, after use, is wound up again in a slave cassette.
The document DE 10 2017 110 231 A1 has already disclosed a cutting device for processing textiles. The cutting device has an elongate cylinder body which is mounted such that it can be driven about an axis of rotation. On the cylinder body, there is fastened an elongate blade of helical form. Furthermore, the cutting device has an elongate counterpart blade, the longitudinal axis of which extends parallel to the axis of rotation of the cylinder body.
The document DE 24 04 837 C3 has furthermore already disclosed a shearing spiral for a revolving shearing cylinder. For the purposes of shearing fibrous web, the shearing cylinder interacts with a static, straight counterpart blade which is arranged parallel to the cylinder axis.
Although the use of fly cutters is basically well proven, it is associated with relatively high levels of noise generation, which is perceived as disturbing and which can therefore necessitate noise protection measures. Owing to the fly cutter which moves at high speed during operation and also during the setup of the shearing devices, it is furthermore necessary for the user to exercise increased caution in order to avoid injuries. For reasons of working safety, it is necessary to define and comply with safety measures for the operation of the shearing devices and to equip the shearing devices with corresponding protection means in order to minimize a risk of injury during the setup and operation of the shearing devices. The known shearing devices therefore require a safety-oriented and relatively cumbersome construction even of the peripheral equipment of the shearing devices, in order to adequately allow for the particular risk associated with the use of fly cutters. Particular caution must be exercised in particular during the setup of these shearing devices, because it is here that the technician performing the setup must also perform handling operations in the working region of the shearing devices, in which the fly cutters move. This can make the manipulation of the previously known shearing devices more difficult.
It is therefore an object of the invention to provide a shearing device, a brush production machine and a use of a shearing device of the type mentioned in the introduction, with which the above-stated disadvantages can be reduced or eliminated entirely.
To achieve said object, a shearing device is firstly provided, which has one or more features of the invention that are directed to a shearing device of this type. Accordingly, to achieve the object, there is provided, in particular, a shearing device having a blade and having a counterpart blade assigned to the blade, wherein the blade, in order to generate a cutting movement relative to a counterpart blade cutting edge of the counterpart blade, is rotatable about an axis of rotation and has at least one blade cutting edge which is helically coiled about its axis of rotation. The rotation of the blade about its axis of rotation has the effect that the blade cutting edge, which is helically coiled about the axis of rotation, also moves relative to the counterpart blade cutting edge of the blade. Here, a relative cutting movement between the blade cutting edge and the counterpart blade cutting edge is generated, by which, for example, bristle filaments can be shortened. With this cutting concept of the shearing device, fly cutters are avoided, by which bristle filaments are literally hacked off. The shearing device according to the invention permits a continuous and flowing cutting movement, which can lead not only to improved cutting results but also to a higher level of working safety during the operation of the shearing device.
It is preferable if the at least one helically coiled blade cutting edge runs all the way around the axis of rotation of the blade at least once, preferably multiple times. This promotes the greatest possible cutting edge length of the blade cutting edge and can contribute to a fine, precise cut.
The shearing device can satisfy particularly high safety demands, while at the same time providing a particularly high-quality cutting pattern, if the blade cutting edges and the counterpart blade cutting edges of the shearing device have a spacing of between 0 mm and 0.5 mm, preferably between 0 mm and 0.1 mm, to one another. In this way, the spacing between the blade cutting edge and the counterpart blade cutting edge is in any case so small that it is impossible to inadvertently place one's fingers between the blade cutting edge and the counterpart blade cutting edge. In this way, the risk of injury during the use of the shearing device can be significantly reduced, and, in particular, severe injuries that can arise with the use of fly cutters can be avoided.
In order to be able to cut even relatively fine bristle filaments reliably and in the most precise possible manner during the machining of brushes, the counterpart blade cutting edge of the counterpart blade may be a notched counterpart blade cutting edge provided with cutting notches. The bristle filaments of a brush for machining by the shearing device can be reliably held within the cutting notches of the counterpart blade and severed by an interaction between the at least one helically coiled blade cutting edge, which rotates during the operation of the shearing device, and the counterpart blade cutting edge. This occurs without the bristle filaments being displaced to too great an extent by the rotating and helically coiled at least one blade cutting edge before the cut occurs.
The blade may have a cylindrical main body. The at least one helically coiled blade cutting edge may be arranged and/or formed on said cylindrical main body. In a particularly preferred embodiment of the shearing device, the blade has two or three or four or more helically coiled blade cutting edges. The shearing device thus provides a blade which has multiple helically coiled encircling blade cutting edges and which thus exhibits a relatively large cumulated cutting edge length. This can increase the service life of the blade, such that an exchange of the blade or re-grinding of the blade is required less often than in the case of blades of hitherto used shearing devices.
The shearing device may have a suction extraction device. By use of the suction extraction device, cutting waste generated during the operation of the shearing device can be directly suctioned out of the working region of the shearing device. This can promote a higher level of manufacturing quality and can furthermore reduce generation of dust and/or dirt in the working region of the shearing device.
In one embodiment, the shearing device has a suction extraction housing which at least partially houses the blade which rotates about its axis of rotation during the operation of the shearing device. By the rotational movement of the blade, the cutting waste can be moved into the interior of the suction extraction housing and suctioned from there by the suction extraction device already mentioned above. The use of the suction extraction housing can further reduce the generation of dirt during the operation of the shearing device.
In one embodiment of the shearing device, the counterpart blade is arranged and/or formed with its counterpart blade cutting edge on a suction extraction housing, for example the suction extraction housing already mentioned above. In this way, the suction extraction housing of the suction extraction device is ascribed a dual function, whereby the shearing device can ultimately be provided in a particularly compact design.
The abovementioned cutting notches of the counterpart blade may be symmetrical and/or asymmetrical cutting notches.
The counterpart blade may have cutting notches which have an acute opening angle. With such cutting notches, deflecting movements, in particular of bristle filaments for shortening by the shearing device, which possibly occur during the operation of the shearing device can be avoided. If the counterpart blade has cutting notches which have an obtuse opening angle, it is possibly easier for bristle filaments to be introduced into the cutting notches of the counterpart blade and reliably fixed there for the cutting machining process.
In one embodiment of the shearing device, cutting notches of the counterpart blade have cutting edges which are shorter than the cutting edges of respectively associated counterpart edges and/or which have a steeper gradient than counterpart edges respectively assigned to the cutting edges. In particular if the cutting edges of the cutting notches have a steeper gradient than counterpart edges assigned to the cutting edges, the cutting edges of the cutting notches can form a reliable counter-support for material for cutting, in particular for bristle filaments, which is engaged by the rotating at least one helically coiled blade cutting edge of the blade and subjected to a cutting force during the cutting process. Similarly to the case with a pair of scissors, it is thus possible for the bristle filaments to be severed in a particularly precise manner by the counterpart blade cutting edge which interacts with the at least one helically coiled blade cutting edge.
In one embodiment of the shearing device, cutting notches of the counterpart blade may have a notch depth between 0.1 mm and 10 mm. The optimum notch depth may be selected in a manner dependent on the material for cutting that is to be machined. For a particularly fine material for cutting, that is to say for example for particularly fine bristle filaments of toothbrushes, it may be advantageous to select a small notch depth. For relatively thick material for cutting, for example for bristles for the production of brooms, it may be advantageous to provide cutting notches which have a relatively large notch depth.
The at least one helically coiled blade cutting edge may have a gradient angle of between 0.1 degrees and 45 degrees. The smaller the gradient angle of the at least one helically coiled blade cutting edge, the greater the length of the blade cutting edge can be, which can ultimately lengthen the service life of the blade cutting edge. Furthermore, a smaller gradient angle of the at least one helically coiled blade cutting edge can promote a gentle cutting action.
To generate profiled cuts or profiled cut areas, in particular during the machining of bristle zones of brushes, such as for example toothbrushes, it may be advantageous if the counterpart blade cutting edge is a profiled counterpart blade cutting edge. It is for example possible for the counterpart blade cutting edge to have an undulating profile. The counterpart blade cutting edge may, as required, be of for example convex or concave or convex-concave profile. In the same way as the counterpart blade cutting edge, it is also possible for the at least one helically coiled blade cutting edge to be a profiled blade cutting edge. Here, the at least one helically coiled blade cutting edge may have an undulating profile and/or may be of convex, concave or convex-concave profile. A profiled, helically coiled blade cutting edge may be one whose imaginary envelope has a corresponding profile. It is thus possible for an envelope of a profiled, helically coiled blade cutting edge to have a convex, concave and convex-concave profile, and/or to be provided with an undulating profile.
The blade cutting edges may be of uninterrupted form. It is however basically also possible for the blade cutting edges to have notches and/or serrations and/or recesses. This can expediently influence the cutting behaviour of the shearing device in a manner dependent on the material for cutting.
The counterpart blade cutting edge may have a wedge angle of between 45 degrees and 90 degrees, in particular between 85 degrees and 90 degrees. The wedge angle of the counterpart blade cutting edge may be understood to mean the angle enclosed between the counterpart blade cutting edge and a longitudinal plane of the counterpart blade. The longitudinal plane of the counterpart blade may be oriented parallel to the axis of rotation of the blade. In the case of a counterpart blade with cutting notches, these may have a wedge angle of between 45 degrees and 90 degrees, in particular between 85 degrees and 90 degrees.
In one embodiment of the shearing device, the at least one helically coiled blade cutting edge has a wedge angle of between 10 degrees and 90 degrees.
In one embodiment of the shearing device, the at least one helically coiled blade cutting edge has a clearance angle of between 1 degree and 30 degrees. The counterpart blade may, in one embodiment of the shearing device, have an acute or an obtuse bevel angle. The bevel angle of the counterpart blade may be an angle enclosed between a bevel adjoining the counterpart blade cutting edge and a longitudinal plane of the counterpart blade. The longitudinal plane of the counterpart blade may be oriented parallel to the axis of rotation of the blade. The bevel angle of the counterpart blade may amount to between 5 degrees and 45 degrees or for example also between 45 degrees and 120 degrees.
In one embodiment of the shearing device, a wedge angle of the counterpart blade cutting edge is greater than or equal to a bevel angle of the counterpart blade which is enclosed between a bevel adjoining the counterpart blade cutting edge and a longitudinal plane of the blade. In a particularly advantageous embodiment of the shearing device, the at least one helically coiled blade cutting edge is arranged on a web which runs in helically coiled fashion around the axis of rotation of the blade. This web may have a web width of 0.3 mm to 5 mm and/or a web height of 1 mm to 20 mm. Free spaces that may form between adjacent portions of the helically coiled encircling web on the blade may be used for receiving and discharging cutting waste. In this way, the cutting waste generated during the use of the shearing device can be received by the blade rotating about its axis of rotation and for example transported in the direction of the suction extraction device as already mentioned above.
All embodiments of the shearing device according to the invention are distinguished by relatively little generation of dirt. Whereas, in the case of fly cutters such as are already known from practice, during the machining of bristle filaments, the cutting waste can be shot away at relatively high speeds owing to the momentum of the cutting blade and under some circumstances adversely affects the production in other areas, this is prevented in the case of the shearing device according to the invention owing to the different cutting principle. The speed with which the at least one helically coiled blade cutting edge is moved past the counterpart blade cutting edge in the direction of the axis of rotation can be considerably lower. Thus, the cut-off part of a bristle filament, for example, has considerably less momentum imparted to it by the impacting of the blade cutting edge of the shearing device, such that said part is not shot out, or is not shot out far, from the cutting region of the shearing device. In interaction with the suction extraction device already mentioned above, it is possible in an effective manner to prevent the cutting waste that is generated during the use of the shearing device from passing out of the cutting region of the blade.
The blade may have, between the at least one helically coiled blade cutting edge and a flank of the blade cutting edge, a transition surface which is parallel to the axis of rotation of the blade. The flank may have a width, measurable in the direction of the axis of rotation, of between 0.001 mm and 0.3 mm. This can simplify regrinding of the blade.
In one embodiment of the shearing device, cutting notches of the counterpart blade have a profile direction which is oriented at right angles or obliquely with respect to a main extent direction of the counterpart blade cutting edge. The profile direction of the cutting notches of the counterpart blade may for example be oriented at an angle of between 10 degrees and 80 degrees with respect to the main extent direction of the counterpart blade cutting edge.
The shearing device may have a holder for a workpiece, in particular a holder for a brush, preferably for a round brush and/or for a toothbrush.
In one embodiment of the shearing device, said shearing device has a multi-axis robot for the handling of a workpiece and/or for the feed and/or manipulation of the workpiece at the blade. With a correspondingly programmed multi-axis robot, it is possible to perform freeform machining of a workpiece at the shearing device. It is thus possible to generate brushes with particularly complex bristle zone geometries.
In one embodiment of the shearing device, said shearing device has a multi-axis robot on which the blade and/or the counterpart blade are arranged. In this way, the blade and/or the counterpart blade can be moved relative to a, preferably fixed, workpiece in order to perform the abovementioned freeform machining of the workpiece.
For the machining of bristled brushes, the shearing device may have a bristle displacement device. By use of such a bristle displacement device, individual bristles, individual bristle bundles or even groups of bristle bundles can be displaced such that they are not engaged by the blade and counterpart blade of the shearing device. In this way, it is possible for even complex bristle zone geometries to be generated by the shearing device. Here, different groups of bristle filaments or bristle bundles can be shortened to different lengths. For this purpose, the bristle filaments are machined gradually. Bristle filaments which are initially not to be shortened, or which are initially to be shortened to a different length, can be displaced out of the region of action of the shearing device by the bristle displacement device.
To achieve the object, there is finally also provided a brush production machine which has one or more features of the invention directed to such a brush production machine. To achieve the object, it is thus provided, in the case of a brush production machine of the type mentioned in the introduction, for said brush production machine to be equipped with a shearing device with one or more features of the invention.
Finally, to achieve the object, there is also proposed the use of a shearing device according to any of the claims directed to a shearing device for cutting bristle filaments to length.
The invention will be described in more detail below on the basis of multiple exemplary embodiments. The invention is however not restricted to these exemplary embodiments. Further exemplary embodiments will emerge from combination of the features of individual or several patent claims with one another and/or in the combination of individual or several features of the exemplary embodiments. In the figures, in part in a highly schematic illustration:
In the following description of various embodiments of the invention, elements which correspond in terms of their function are denoted by corresponding reference designations even in the case of different design or shaping.
All of the figures show constituent parts of different embodiments of shearing devices which are denoted as a whole by 1. Unless separately stated, the following description relates to all embodiments of the shearing devices 1.
The shearing device 1 has a blade 2 and a counterpart blade 3 assigned to the blade 2. The blade 2 is rotatable about an axis of rotation R in order to generate a cutting movement relative to a counterpart blade cutting edge 4 of the counterpart blade 3. The blade 2 of the shearing devices 1 illustrated in the figures has a total of four blade cutting edges 5, which are helically coiled about the axis of rotation R of said blade. It can be clearly seen that each helically coiled blade cutting edge 5 runs all the way around the axis of rotation R of the blade 2 multiple times.
It is clear from
All of the counterpart blades 3 illustrated in the figures are counterpart blade 3 whose counterpart blade cutting edge 4 is a notched counterpart blade cutting edge provided with cutting notches 6.
Due to the cutting notches 6 of the counterpart blade cutting edge 4, it is possible for bristle filaments 7 of brushes 8 for machining to be held on the counterpart blade 3. By the blade cutting edges 5 rotating about the axis of rotation R, it is then possible for the bristle filaments 7 of the brushes 8 for machining, which bristle filaments are situated in the cutting notches 6, to be reliably severed without the bristle filaments 7 being able to deflect to too great an extent when the rotating blade cutting edges 5, during the cutting movement caused by the rotation about the axis of rotation R of the blade 2, move toward cutting edges 9 of the cutting notches 6.
The shearing devices shown in
In the exemplary embodiment of a shearing device 1 illustrated in
The enlarged detail views of the counterpart blades 3 (see
In the exemplary embodiment of the counterpart blade 3 illustrated on an enlarged scale in
The counterpart edges 13 assigned to the cutting edges 9 enclose an angle of between 30 degrees and 80 degrees with the main extent direction PF.1 of the counterpart blade cutting edge 4, which in the use position of the counterpart blade 3 is oriented parallel to an axis of rotation R of the blade 2, and said counterpart edges are accordingly provided with a shallower gradient than the cutting edges 9.
The cutting notches 6 of the counterpart blades 3 illustrated in the figures have a notch depth of between 0.1 mm and 10 mm. The notch depths may be selected in a manner dependent on the material that is to be cut by the shearing device 1.
The helically coiled blade cutting edges 5 of the blades 2 shown in the figures have a gradient angle which may amount to between 0.1 degrees and 45 degrees depending on the usage situation.
The blade cutting edges 5 of the blades 2 are profiled correspondingly to the profile of the counterpart blade cutting edges 4 assigned thereto. Accordingly, the blade 2 illustrated in
The blade cutting edges 5 shown in the figures are of uninterrupted form. It is however basically possible for the blade cutting edges 5 to be equipped with notches or serrations or recesses. This can expediently influence the cutting behaviour of the shearing device 1 in a manner dependent on the material for cutting.
The counterpart blade cutting edge 4 and in particular the cutting notches 6 of the counterpart blade cutting edge 4 of the counterpart blade 3 shown in the figures have a wedge angle of between 45 degrees and 90 degrees, in particular between 85 degrees and 90 degrees. Here, a wedge angle may be understood to mean the angle enclosed between the counterpart blade cutting edge 4 and an imaginary longitudinal plane of the counterpart blade 3.
The helically coiled blade cutting edges 5 have wedge angles between 10 degrees and 90 degrees.
The helically coiled blade cutting edges 5 furthermore have clearance angles of between 1 degree and 30 degrees. The counterpart blades 3 may have an acute or an obtuse bevel angle, wherein the bevel angle is the angle enclosed between a bevel 14 adjoining the counterpart blade cutting edge 4 and an imaginary longitudinal plane of the counterpart blade 3. The bevel angle of the counterpart blades 3 may amount to between 5 degrees and 45 degrees or else between 45 degrees and 120 degrees.
In the case of the counterpart blades 3 shown in
The helically coiled blade cutting edges 5 of the blades 2, shown in the figures, of the shearing devices 1 are each arranged on a web 16 which runs in helically coiled encircling fashion around the respective axis of rotation R of the blade 2. The webs 16 have a web width of between 0.3 mm and 5 mm and a web height of 1 mm to 20 mm, and may be produced for example by milling machining of the main body 10.
The blade 2 shown in
In
The rest of the counterpart blades 3 have cutting notches 6, the profile direction of which is oriented obliquely with respect to a main extent direction of the counterpart blade cutting edge 4, and also obliquely with respect to the axis of rotation R of the blade 2, when the counterpart blade 3 is situated in its use position on the shearing device 1. The orientation of the profile directions of the cutting notches 6 may in this case amount to between 10 degrees and 80 degrees. These obliquely oriented cutting notches 6 result in relatively small wedge angles at the cutting edges 9 of the cutting notches 6, which can ultimately promote a finer cutting pattern.
Each shearing device 1 shown in the figures furthermore has a holder 19 for a workpiece, in this case a brush 8. In the case of the shearing device 1 shown in
The shearing device 1 shown in
The shearing device 1 shown in
The shearing device 1 as per
The rotary indexing table 24 is assigned an infeed station 26 and a removal station 27 of the brush production machine 22. By the removal station 27, machined brushes 8 can be removed from the rotary indexing table 24 of the brush production machine 22. By the infeed station 26, brushes 8 that have not yet been machined are fed to the rotary indexing table 24 and via the latter to the shearing device 1 for the machining of the bristle filaments 7 of the brushes 8.
The shearing device 1 shown in the figures is thus suitable for cutting bristle filaments 7 to length during the machining and production of brushes 8.
The invention is concerned with improvements in the technical field of shearing devices. For this purpose, inter alia, the shearing device 1 is provided, which has a blade 2 with at least one blade cutting edge 5 which is helically coiled, and rotatable, about an axis of rotation R of the blade 2. The blade cutting edge 5 is assigned a counterpart blade cutting edge 4 of a counterpart blade 3. The shearing movements, by which for example bristle filaments 7 of brushes 8 for machining can be cut to length, are generated by the relative rotational movement of the at least one helically coiled blade cutting edge 5 with respect to the preferably static counterpart blade cutting edge 4 of the counterpart blade 3. Since the blade 2 and the counterpart blade 3 can keep their spacing to one another constant during the operation of the shearing device 1, the shearing device 1 is distinguished by a relatively low risk of injury during the use thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102019105877.5 | Mar 2019 | DE | national |
