The invention relates to a cutting device, particularly a transverse cutting shear, a longitudinal cutting shear, or rolling cut (trimming) shear for cutting sheet metal in accordance with the preamble of claim 1.
A double trimming shear with a stationary bottom blade is known from WO 2008/037239 A1, wherein the respective upper blade is driven by eccentric shafts through connecting rods so as to be able to be raised and lowered. Each connecting rod is arranged on an eccentric shaft, wherein the upper blade, due to different crank radii, due to the offset thereof and different connecting rod lengths, carries out a rolling cut movement which is guided by a sliding block. Although, even the length of connecting et this drive mechanism can be changed, the field of use of this shear is very limited. In the indicated construction, it is primarily the stationary lateral articulated connection of the upper blade to one of its ends that has a negative effect. Consequently, a cut of high quality can only be made possible for a relatively limited thickness range. Moreover, the cutting device can only be used for limited sheet metal widths.
WO 2008/135127 A1 shows another cutting device for cutting sheet metal plates, with a first cutting blade of an upper blade and a second cutting blade of a lower blade, which additionally includes a drive device with at least two rotatably drivable eccentric shafts which are connected from above to the first cutting blade by means of connecting elements, wherein at least one of the connecting elements is constructed so that its length is adjustable between the drive of the blade and the upper blade. The device disclosed in this document has similar disadvantages as the device according to the previously described document. Again, the upper blade is articulated laterally in such a way that a rolling movement cannot be realized for many sheet metal thicknesses and widths. The cutting movement is the same for all sheet metal thicknesses and limits the cutting thickness of the machine. However, it would be desirable to make it possible to adapt the cutting movement to the sheet metal thickness in order to achieve good cutting results. In particular in thick materials, a poor quality of the cut is found. In particular, in the case in the document first cited, cutting arches and bending of the sheet metal end could not be avoided in larger sheet metal thicknesses.
a shows another example from the state of the art which is guided by means of a rotatable guide rod 30. The upper blade 10 is in this case once again moved by two electromechanical drives 40 which each have connecting rods which are adjustable over the length thereof. However, the lateral articulated connection 30 is effected with a fixed length. The ideal rolling movement can be structurally determined only for a fixed immersion depth of the upper blade 10. This results in deformations of the sheet metal (for example cutting arches) and a general reduction of the quality of the cuts.
b shows another example of a cutting device from the state of the art which shows a system composed of an upper and a lower blade 10, 20, wherein the upper blade 10 is hydraulically driven (41) and is again laterally articulated with a fixed length.
Finally,
In view of the state of the art explained above, it is the technical object to make available a cutting device which avoids at least one of the above mentioned disadvantages, or which further develops the above mentioned devices.
The technical object is met by the cutting device according to the invention, particularly a transverse cutting shear, a longitudinal cutting shear or a rolling cut shear for cutting sheet metal, which comprises an upper blade and a lower blade as well as at least one drive device which is connected to the upper blade and/or the lower blade for driving the cutting procedure, and wherein the device comprises a lateral guidance for guiding the upper blade whose length is constructed so as to be adjustable in its longitudinal direction. Consequently, the excess cut of the blades is adjustable. Because of the possibility of longitudinally adjusting the lateral guidance according to the invention, it is now possible to ensure a better quality of the cut. This refers primarily to cuts in different sheet metal widths and thicknesses. In accordance with the invention, the spectrum of cutting widths and thicknesses can be significantly expanded. The above mentioned disadvantages can be for the most part avoided.
In accordance with a preferred embodiment of the cutting device, the lateral guidance is at one end connected to the upper blade, and at another end, to a articulation point which is arranged laterally of the upper blade.
In accordance with another preferred embodiment of the cutting device, the lateral guidance includes an adjusting element for adjusting the length.
In accordance with another preferred embodiment of the cutting device, the lateral guidance comprises a rotatable cam disk, so that the length of the lateral guidance can be adjusted.
In accordance with another preferred embodiment of the cutting device, the lateral guidance comprises a sliding block whose guide track is constructed so as to be changeable with respect to space such that the lateral guidance can be adjusted along the length thereof.
In accordance with another preferred embodiment of the cutting device, the lateral guidance comprises hydraulic or pneumatic means for length adjustment the lateral guidance.
In accordance with another preferred embodiment of the cutting device, the lateral guidance comprises electromechanical means for the length adjustment of the lateral guidance.
In accordance with another preferred embodiment of the cutting device, the lateral guidance comprises a threaded rod or a threaded spindle and at least one, preferably two, threaded sleeves, which are constructed in such a way that the length of the lateral guidance is adjustable.
In accordance with another preferred embodiment of the cutting device, the cutting device is constructed in such a way that the lateral guidance comprises a connecting element which at one end is connected to the upper blade, and at another end to an articulation point or a shaft.
In accordance with another preferred embodiment of the cutting device, the connecting element is constructed at the other end so as to be mechanically drivable and is supported in particular at a rotatably drivable eccentric shaft.
In accordance with another preferred embodiment of the cutting device, the connecting element is supported on the eccentric shaft at an eccentrically adjustable articulated connection.
The invention further relates to a method for controlling a cutting device, particularly a transverse cutting shear, a longitudinal cutting shear, or rolling cutting shear for cutting sheet metal, which includes an upper blade and a lower blade, as well as at least one drive device which is connected to the upper blade and/or the lower blade for driving the cutting procedure, and wherein the cutting device comprises a lateral guidance for guiding the upper blade, which can be longitudinally adjusted. The advantages of the method according to the invention correspond essentially to those of the device according to the invention.
In accordance with another preferred embodiment of the method, the lateral guidance is adjusted such that during the cutting procedure, a rolling movement, particularly a continuous rolling movement, is ensured.
In accordance with another preferred embodiment of the method, for adjusting the lateral guidance, at least one of the following parameters is taken into consideration: Cutting angle, immersion depth of the upper blade, material thickness, material width, and/or material properties. By taking into consideration these parameters, together with the length adjustment of the lateral guidance, a cut of high quality can be achieved.
In the following, the Figures of the embodiments are briefly described. Further details can be found in the detailed description of the embodiments. In the drawing:
a shows a cutting device of the prior art with lateral articulated connection;
b shows another example of a cutting device with lateral articulated connection of the prior art;
c shows another example of a cutting device with lateral articulated connection of the prior art;
An embodiment of a shear according to the invention is illustrated in
Another possibility according to the invention for providing a laterally changeable articulation connection is illustrated in
The devices according to the invention make possible a variation of the excess cut of the blades 1, 2 or of the overlap of the blades 1, 2 so that significantly better cutting results, primarily at the cut edges, are obtained than is the case in known shears.
Number | Date | Country | Kind |
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10 2009 049 743.9 | Oct 2009 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2010/006308 | 10/15/2010 | WO | 00 | 7/17/2012 |