Mowing device with a cutting unit designed as a double-blade cutting system

Description

[0001] The present invention relates to a mower blade device with a cutting unit designed as a double-blade cutting system.

[0002] Such mower blade devices are known from the prior art. A problem with such a mower blade device is that it is wider than the cutting area of ​​the cutting mechanism. In a double-blade cutting system, two blades must work together to cut the material. At least on the side of the mower blade device facing the uncut material, uncut material is pressed down by the outermost element, which has a single blade. Pressed-down material cannot be optimally cut by a mower blade device with a double-blade cutting system, especially if the material is driven over in the same direction in which it was pressed down during a previous mowing operation.This is particularly problematic when the cut vegetation doesn't have time to recover between mowing passes, especially when two mower blade units are used, positioned one behind the other and offset laterally. Cutting unit combinations that combine a front mower with a side mower are especially affected. In this case, a second mower blade unit, positioned behind the first in the direction of travel, runs over the flattened vegetation at a distance of a few centimeters in the same direction. The flattened strip of vegetation is either not mowed at all or only poorly cut, resulting in strips. A portion of the available cutting material is lost in these strips.

[0003] Various mower blade devices are known from the prior art, addressing the problem of striping in different ways. For example, DE 20 2020 106 292 U1 proposes that a guide plate with a deflector be arranged at each of the lateral ends of the cutting unit in a mower blade device. This deflector extends vertically from above at least to the cutting plane of the cutting unit. The guide plate with the deflector is intended to reduce the pressure of the cut material by the outermost element of the cutting unit.

[0004] From DE 4 014 624 C2, a mower blade device is known in which an outer shoe is arranged offset inwards from the outer edge of the cutting area. This reduces the downward pressure exerted by the shoe. However, the material to be cut is still pressed down by the outermost element of the cutting unit, which is designed as a double-knife cutting system.

[0005] US Patent 3,058,288 A discloses a mower blade device with a cutting unit designed as a double-blade cutting system, wherein the mower blade device has a counter blade that interacts with a blade arranged on a lower blade back of the cutting unit. The blade is arranged flush with the blade back.

[0006] The object of the present invention is to provide a mower blade device of the aforementioned type which is simple in design and reliable and further reduces striping compared to previously known mower blade devices.

[0007] This problem is solved by a mower blade device according to claim 1. The mower blade device comprises a support structure and a cutting unit fixed to the support structure. The cutting unit is designed as a double-blade cutting system. It comprises an upper cutting blade and a lower cutting blade. These can be moved relative to each other by means of a drive mechanism of the mower blade device. The upper cutting blade and the lower cutting blade each have a blade back, the upper blade back and the lower blade back. Several blade elements are fixed to each of these blades. The blade elements fixed to the upper blade back and the lower blade back define a cutting plane of the cutting unit between them. During operation of the mower blade device, the upper and the lower cutting blades move past each other longitudinally. The material to be cut is gripped between two blade elements and cut off.The blade elements are preferably detachably attached to the respective knife back, so that they can be easily removed from the knife back if damaged.

[0008] Typically, a blade element comprises exactly one cutting unit with two opposing cutting edges. A cutting edge of the upper cutting blade and a cooperating cutting edge of the lower cutting blade typically enclose an angle between 40° and 45°, in particular an angle of 42°. Preferably, the upper and lower cutting blades are designed to be movable not only relative to each other but also relative to the support structure. According to the invention, the mower blade device also has at least one counter-edge arranged in a position fixed relative to the support structure and cooperating with an outer cutting edge of the upper or lower cutting blade. The outer cutting edge that interacts with the counter-edge is the first or last cutting element of the respective cutting blade. The outermost cutting element has an outer cutting edge that interacts with the counter-edge.The outer blade element projects laterally beyond the back of the upper or lower blade, in the direction of the counter blade. When using a counter blade in the outer edge area of ​​the mower blade assembly, which is fixed to the support structure and therefore does not move, the counter blade can be narrower than the blade elements of the cutting unit. This allows the outermost element of the mower blade assembly to be designed narrower. A narrower outermost element presses down less uncut material when passing over it, thus reducing striping. Using an outer blade element that projects laterally beyond the back of the upper or lower blade makes it easy to design the cutting unit to be particularly flat in this area. This reduces the risk of blockages in the edge area.This enables a reliable mower blade device that exhibits reduced streaking.

[0009] Preferably, the mower blade assembly has a guide element arranged laterally to the cutting area of ​​the cutting unit. This guide element is particularly preferably designed as a guide plate. The guide element serves to separate the material to be cut, which is fed into the cutting area of ​​the cutting unit, from the material not to be cut, which is guided past the outside of the mower blade assembly. The use of such a guide element arranged laterally to the cutting area of ​​the cutting unit further reduces the tendency of the mower blade assembly to become clogged. The reliability of the mower blade assembly is increased. Particularly preferably, the counter blade is arranged on the guide element, in particular a guide plate. By arranging the counter blade on the guide element, which in turn is fixed to the mower blade assembly's support structure, the counter blade is fixed to the support structure.By positioning the guide element itself, the gap between the guide element and the counter blade, where clippings can become trapped, is reduced or completely eliminated. This reduces the likelihood of the mower blade clogging and increases its reliability.

[0010] Preferably, the guide element projects forward in the direction of travel relative to the cutting unit and has an increasing distance perpendicular to the cutting plane of the cutting unit in the direction of travel. With a guide element designed in this way, the uncut material is not only divided before it reaches the cutting plane into a portion to be fed into the cutting area and a portion to be guided past the outside of the mower blade assembly, but it also guides the material located between these areas downwards in a controlled and clean manner before it reaches the cutting unit. This further reduces the tendency of the mower blade assembly to become clogged and increases its reliability. The guide element is particularly preferably convex when viewed in the longitudinal direction of the cutting unit. Alternatively, the guide element can be wedge-shaped in this view.

[0011] Preferably, the guide element is particularly narrow, in particular narrower than a blade element of the cutting unit or narrower than a counter blade, especially one arranged on the guide element. The guide element is, in particular, narrower than a cutting unit of a blade element at the level of the cutting plane of the cutting unit in the direction of travel, and has a maximum width of 20 mm. A cutting unit of a blade element comprises two opposing cutting edges. The typical width of a cutting unit is between 40 mm and 80 mm. A narrow guide element allows for particularly good cutting of the material. Furthermore, the proportion of material pushed downwards by the guide element is further reduced when using a particularly narrow guide element.

[0012] Preferably, the guide element is arranged to project downwards beyond the cutting plane in the area of ​​the cutting unit. A guide element projecting downwards in the area of ​​the cutting unit can exert a certain pressure on lying or pressed-down material in an area outside the cutting zone of the cutting unit, thereby lifting the opposite end of the material. Such a lifted end is more easily grasped by the cutting unit and can be cut more cleanly. The cutting pattern of the mower blade assembly is improved, and striping is reduced. This is particularly advantageous in conjunction with the use of a particularly narrow guide element, as this ensures that only a narrow strip of uncut material is pressed below the level of the cutting plane of the cutting unit.

[0013] Preferably, the components of the mower blade assembly located in the end region of the cutting unit project downwards towards the ground by 0 mm to 25 mm, particularly preferably by 10 mm to 20 mm, relative to the cutting plane. The end region of the cutting unit is the area in which the counter blade and the outer blade element interacting with the counter blade are located. It extends inwards from the outer end of the mower blade assembly to a first retaining device. Because the components located in the end region of the cutting unit do not project, or only project slightly, relative to the cutting plane of the mower blade assembly, the pressure of the material being cut in this area is reduced. The formation of strips by the mower blade assembly is further reduced. In particular, only the guide element in the end region of the cutting unit projects downwards towards the ground relative to the cutting plane of the cutting unit.

[0014] Preferably, the support structure has at least one lateral cutting unit mounting section by which the cutting unit is fixed to the support structure, with the cutting unit being arranged below this mounting section. Typically, cutting units are arranged on cutting unit mounting sections or in a cutting unit receptacle of a support structure. However, if the cutting unit is fixed below a cutting unit mounting section on the support structure, a larger clearance can be maintained below the cutting unit between the cutting plane and the ground. The material being cut is not pressed down by the lateral cutting unit mounting section of the support structure. This allows, in particular, components arranged in a cutting unit end region to project downwards from the cutting plane towards the ground by a maximum of 0 mm to 25 mm, preferably 10 mm to 20 mm.Additional elements such as sliding shoes are to be arranged offset inwards from the end of the cutting unit to the mower blade assembly.

[0015] Particularly preferably, the drive is arranged at the end of the cutting unit that is fixed to the support structure, and a counter blade that interacts with the lower cutting knife is arranged at this end. Arranging the drive above the cutting plane of the cutting unit prevents the material being cut from being pressed down by the drive. The use of a counter blade that interacts with the lower cutting knife and is particularly arranged below the cutting plane of the cutting unit simplifies the combination of the drive and counter blade at the end of the cutting unit where it is fixed to the support structure. The cutting unit can thus be manufactured in a particularly simple manner.

[0016] Preferably, the outer blade element is designed as a double or multiple blade element. A double blade element is a blade element comprising two cutting units, each with two opposing cutting edges. A multiple blade element is a blade element comprising more than two such cutting units with two opposing cutting edges. By using a double or multiple blade element as the outer blade element, the outer blade element can be arranged particularly easily, projecting laterally beyond the upper or lower blade back. For this purpose, a double blade element can be fixed to the respective blade back in the area of ​​one cutting unit of the double blade element, with the other cutting unit of the double blade element projecting laterally beyond the blade back.The same procedure can be used for multi-blade elements, wherein at least one cutting unit of the multi-blade element is arranged to project outwards in a lateral direction relative to the respective blade back. The mower blade device according to the invention can be implemented in a particularly simple manner by using double or multiple blade elements.

[0017] Preferably, the counter blade and the outer blade element are designed such that the counter blade is completely overlapped by the outer blade element during the cutting process. This ensures that the material to be cut cleanly and completely at the end of the cutting area. The risk of blockages is reduced and the reliability of the mower blade assembly is increased.

[0018] Preferably, the counter blade has a cutting area that, when viewed from above, extends at least as far in the direction of travel as the outer blade element interacting with the counter blade. This ensures that material between the counter blade and the outer blade element is reliably cut, reducing the risk of clogging and streaking.

[0019] Preferably, the cutting edge of the outer blade element, which interacts with the counter-edge, and the counter-edge itself, viewed from the cutting plane, form an angle of no more than 30°, preferably an angle between 10° and 30°, and particularly preferably an angle of 15°. The angle between the outer blade element and the counter-edge is significantly more acute than the angle between two blade elements of the upper cutting blade and the lower cutting blade, which is typically in the range of 40° to 45°, particularly 42°. This ensures particularly reliable separation of the material being cut between the counter-edge and the outer blade element. The risk of clogging and streaking is further reduced.

[0020] Preferably, the counter blade has a first sliding surface and the outer blade element has a corresponding sliding surface. The two sliding surfaces are designed to work together to guide the outer blade element. In particular, a counter blade arranged above the cutting plane and above the upper cutting blade, or a counter blade arranged below the cutting plane and below the lower cutting blade, supports the cutting blade in the end region of the cutting unit. This prevents a gap from forming between the counter blade and the outer blade element, or between the blade elements of the upper cutting blade and the blade elements of the lower cutting blade, when viewed from the front against the direction of travel, which would significantly impair the cutting result. The guidance of the upper cutting blade, orThis easily improves the performance of the lower cutting blade and enhances the cutting characteristics of the cutting unit, particularly in the edge area relevant to striping. Stripping is reduced and the reliability of the mower blade system is increased.

[0021] Preferably, a holding device for the lower blade back or the upper blade back is arranged adjacent to the counter blade. Particularly preferably, the holding device arranged adjacent to the counter blade interacts with the blade element that is not guided by a sliding surface of the counter blade. "Adjacent to the counter blade" here means that the holding device is arranged in the outer cutting unit area, i.e., in a region 100 mm to 150 mm long from the outer lateral end of the mower blade assembly. The holding device arranged adjacent to the counter blade is the one located closest to the counter blade. The holding device can be a lower blade guide arm or an upper blade guide arm.By providing a suitable holding device, it is possible to avoid the need for an additional sliding guide below the cutting plane of the cutting unit in the area adjacent to the holding device on the outward side. Eliminating such a separate sliding guide allows for a greater distance between the ground and the elements of the mower blade assembly located below the cutting planes of the cutting unit in the cutting unit end area. This reduces the downward pressure on the crop and thus minimizes striping. The holding device preferably features a deflector aligned in the direction of travel of the mower blade assembly, which at least partially covers the area of ​​the guide element during the movement of the upper and lower cutting blades relative to each other.This deflector reduces the risk of clippings accumulating in the area between the holding device and the guide element, thus preventing blockages. The reliability of the mower blade assembly is further improved.

[0022] Alternatively or additionally, the holding device has a conveying element that moves the material being cut away from the guiding element, or is designed as such.

[0023] This conveying element can be formed, in particular, by a sheet metal plate arranged on the holding device and positioned approximately parallel to the direction of travel. The conveying element moves cut material away from the guide element, thus reducing the risk of clogging. Furthermore, such a conveying element can aid in the formation of a windrow. The reliability of the mower blade assembly is improved, and streaking is reduced.

[0024] Preferably, the mower blade assembly includes a swathing device. The swathing device gathers the cut material into a swath deposited behind the mower blade assembly. The swathing device is arranged, in particular, on or behind the guide element in the direction of travel. The edge area of ​​the cutting unit is cleared of cut material. Subsequent cutting operations of uncut material are not affected by already cut material. The risk of clogging of the mower blade assembly is further reduced. In addition, any material that may have been flattened during a previous mowing operation can be more easily picked up and cut more cleanly in an area cleared of cut material. Stripping is thus further reduced.

[0025] Preferably, the mower blade assembly has a support structure with two lateral cutting unit mounting sections, by which the cutting unit is fixed to the support structure at both its beginning and end. In particular, the mower blade assembly has a counter blade at both the beginning and end of the cutting unit. More preferably, a guide element is arranged on each of the two cutting unit mounting sections. A mower blade assembly designed in this way can, for example, be used as a front mower.

[0026] Preferably, the mower blade assembly includes a counter-blade adjustment device by which the positioning and / or alignment of the counter-blade relative to the support structure can be adjusted. This allows the counter-blade to be easily arranged relative to the support structure and, consequently, to the outer blade element of the cutting unit fixed to the support structure, in such a way that the counter-blade and the outer blade element can work together for good cutting performance.

[0027] Preferably, the counter-edge adjustment device allows for adjustment of both the height and the angle of the counter-edge relative to the support device. This enables the counter-edge to be aligned with the outer blade element in such a way that good cutting performance can be achieved over large portions of the cutting line, in particular the entire cutting line, of the interacting cutting edges.

[0028] The counter-blade adjustment device preferably comprises a counter-blade holder to which the counter-blade is attached. Alternatively, the counter-blade holder can also be formed integrally with the counter-blade. In particular, the counter-blade holder is fixed to the support structure by means of screw connections via an elongated hole, preferably at least two elongated holes, of the counter-blade adjustment device. The corresponding elongated hole(s) can be located in the support structure itself or on other elements of the mower blade assembly, such as a guide element, which are themselves attached to the support structure. Alternatively, the elongated hole(s) can also be formed in the counter-blade holder.The use of screw connections with a slotted hole allows the counter-blade holder and counter-blade to be positioned continuously and variably relative to the support structure within certain ranges and fixed in the chosen position by the clamping force of the screw connection. This enables a mower blade assembly with such a counter-blade adjustment device to be implemented in a particularly simple manner. Furthermore, with a suitably designed mower blade assembly, the counter-blade can be easily removed and reinstalled for repair, resharpening, or replacement.

[0029] Further advantages and details of the invention can be found in the following description of the figures and exemplary embodiments of the invention. The figures show schematically: Fig. 1 shows a section of a mower blade device according to the invention with a guide element designed as a guide plate, in a view against the direction of travel F from an oblique angle above. Fig. 2 shows the section from Fig. 1 in a view against the direction of travel from a low angle; Fig. 3 the section towards Fig. 1 in a view in the direction of travel from an oblique angle above; Fig. 4 the section towards Fig. 1 in a representation against the direction of travel from the front; Figs. 5 to 7: Views of the section of the mower blade device according to the invention. Fig. 1 with the cutting unit in various positions; Fig. 8 a section of an alternative embodiment of a mower blade device according to the invention with a guide element designed as a guide plate in a view against the direction of travel F from an oblique angle above; Fig. 9 a side view of the mower blade device according to Fig. 8 .

[0030] Parts that function identically or similarly are, where appropriate, provided with identical reference numerals. Individual technical features of the embodiments described below can be combined with features of claim 1 as well as with the features of individual embodiments described above to form articles according to the invention.

[0031] The figures show an outer section of a mower blade device 2 according to the invention, with a guide element 4 designed as a guide plate. Fig. 1 The figure shows the section viewed from a perspective opposite to a direction of travel F, from an oblique angle above. The support structure of the mower blade assembly 2, on which the cutting unit 6 is arranged, is concealed by the guide element 4. The cutting unit 6 has an upper cutting blade 8 and a lower cutting blade 10. The upper cutting blade 8 and the lower cutting blade 10 can be moved laterally relative to each other by a drive (not shown). For this purpose, the drive is preferably located at the end of the mower blade assembly 2 opposite the section shown.

[0032] Both the upper cutting blade 8 and the lower cutting blade 10 are movable relative to the support structure. The upper cutting blade 8 has an upper blade back 12. The lower cutting blade 10 has a lower blade back 14. The lower cutting blade 10 with the lower blade back 14 is in Fig. 2 The section is recognizable in a view opposite to the direction of travel, looking obliquely from below. Blade elements 16 are arranged on the upper blade back 12 and on the lower blade back 14.

[0033] In the illustrated embodiment, each of the blade elements 16 is fixed to the respective blade backs 12, 14 via two attachment points. However, more attachment points or a different type of attachment can also be chosen.

[0034] In the illustrated embodiment, the outer blade element 16.1 is designed as a double blade element. Alternatively, the outer blade element 16.1 can also be designed as a multiple blade element. The outer blade element 16.1 is part of the upper cutting blade 8 and is arranged on the upper blade back 12 such that it projects laterally beyond the upper blade back 12. The outer blade element 16.1 is designed to interact with a counter blade 18.

[0035] In the illustrated embodiment, the counter blade 18 is arranged on the guide element 4, which is designed as a guide plate. Crucially, the counter blade 18 is fixed in position relative to the support structure of the mower blade assembly 2 and, unlike the upper cutting blade 8 and the lower cutting blade 10, does not move. Alternatively, the counter blade 18 can also be arranged directly on the support structure or, for example, on a cutter bar 20 of the cutting unit 6.

[0036] In the illustrated embodiment, the counter-edge 18 is arranged above the cutting plane S defined by the upper cutting blade 8 and the lower cutting blade 10 or the blade elements 16 arranged thereon, and above the outer blade element 16.1; see also the illustration in Fig. 4 The counter blade 18 forms a first sliding surface on its underside, which interacts with a corresponding sliding surface of the outer blade element 16.1. To increase the sliding surface area, the counter blade 18 in this embodiment has a foot that extends laterally towards the upper blade back 12. The counter blade 18 and the outer blade element 16.1 work together to guide the upper cutting blade 8 in the outer edge region. This prevents the upper cutting blade 8 and the lower cutting blade 10 from moving apart in the edge region, which would impair the cutting quality.

[0037] The upper cutting blade 8 and the lower cutting blade 10 are arranged on the cutter bar 20 via holding devices 22, 24. The holding devices 22, 24 are designed as a lower blade guide arm 22 and an upper blade guide arm 24. In this embodiment, the lower blade guide arm 22 is arranged directly adjacent to the guide element 4 and engages the first or last blade element 16 of the lower cutting blade 10, depending on the counting method. A sliding guide for the lower cutting blade 10, which would prevent the upper cutting blade 8 and the lower cutting blade 10 from moving apart in the edge region and creating a gap between the respective blade elements 16 in this area that would impair the cutting result, is unnecessary. This ensures that the components of the cutter bar assembly 20 project only slightly downwards towards the ground relative to the cutting plane S in the edge region.

[0038] In Fig. 4 It can be seen that in the area of ​​the counter blade 18, and viewed against the direction of travel F, only the guide element 4 projects downwards relative to the cutting plane S. The cutter bar 20 only begins after the blade elements 16. The guide element 4 can project even further downwards relative to the cutting plane S than the cutter bar 20 that follows it. This ensures that very little of the cut material is bent over and pressed downwards in the area of ​​the guide element 4. The cut material can then recover more quickly after being passed over by the mower blade assembly 2, thus facilitating subsequent mowing and reducing striping.

[0039] The design of the counter-blade 18, which is arranged on the guide element 4 and is wedge-shaped, also serves this purpose. The cutting surface of the counter-blade 18 is longer than the cutting edge of the outer blade element 16.1 that interacts with the counter-blade 18. The outer blade element 16.1 and the counter-blade 18 are designed such that the counter-blade 18 is completely overlapped by the outer blade element 16.1. The guide element 4 directs the material being cut into the area of ​​the counter-blade 18. The material is cut close to the guide element 4. Only a small amount of material remains uncut in the area of ​​the guide element 4. This further reduces the formation of strips.

[0040] In the illustrated embodiment, a deflector 26 is arranged on the lower blade guide arm 22. This deflector is directed forward in the direction of travel, extends along the lower blade guide arm 22, and engages in a corresponding recess in the guide element 4, which is designed as a guide plate. This prevents cut material from accumulating in the area between the lower blade guide arm 22 and the guide element 4. The risk of clogging the mower blade assembly 2 is reduced.

[0041] The lower blade guide arm 22 is thicker than the adjacent upper blade guide arm 24. As a result, the lower blade guide arm 22 in the illustrated embodiment also acts as a conveying element, transporting cut material away from the guide element 4 when the upper cutting blade 8 and the lower cutting blade 10, and thus the lower blade guide arm 22, move. The design of the lower blade guide arm 22 as a conveying element supports the swath formation of the mower blade assembly 2. For this purpose, the mower blade assembly 2 can also be equipped with a swath element, which is not shown in the figures and can be arranged on the mower blade assembly adjacent to the guide element 4. The swath device can be designed, in particular, as a swath plate or as a rotating swath disc.

[0042] The mower blade assembly 2 shown in the exemplary embodiment is designed in the illustrated area such that the material to be cut is cut particularly cleanly at the edges. Uncut material is only slightly pressed down by the guide element 4. In this exemplary embodiment, the guide element 4 is convex for this purpose. Alternatively, it can also be wedge-shaped. The guide element 4 not only divides the material to be cut into a portion to be guided past the mower blade assembly 2 and a portion to be fed to the cutting unit, but also guides the material located in the area between these portions downwards and under the mower blade assembly 2. The tendency of the mower blade assembly 2 to become clogged is significantly reduced. Such a mower blade assembly 2 exhibits significantly reduced striping.

[0043] Fig. 5 bis Fig. 7 The figures show the end region of the mower blade device 2 according to the invention with the cutting unit 6 in different positions. Fig. 5 The upper cutting blade 8 is shown in a position pivoted maximally to the left. Fig. 6 The cutting unit is shown in a central position. Fig. 7 The upper cutting blade 8 is shown pivoted to the maximum extent to the right. The lower cutting blade 10 is pivoted in the opposite direction. Fig. 5 accordingly, it is pivoted as far to the right as possible and in Fig. 7 Shown tilted as far to the left as possible. Fig. 7 shows that in the illustrated embodiment the outer blade element 16.1 completely overlaps the counter-edge 18.

[0044] In the Fig. 5 bis Fig. 7 It can be seen that in the illustrated embodiment, the angle enclosed by the counter-edge 18 and the outer blade element 16.1 is significantly smaller than the angle between any two further blade elements 16 of the upper cutting blade 8 and the lower cutting blade 10.

[0045] Furthermore, it can be seen that the guide element 4 is significantly narrower than the blade elements 16 or a cutting unit of the blade elements 16, which is defined by two opposing cutting edges of the blade elements 16. The correspondingly narrow guide element 4 directs only a small amount of clippings downwards past the mower blade assembly 2. Stripping is reduced.

[0046] Fig. 8 and 9 show an alternative embodiment of a mower blade device. Fig. 8 shows an outer section of a mower blade device 2 from a viewing direction opposite a direction of travel F from an oblique angle above. Fig. 9Figure 1 shows a side view of the mower blade assembly 2 looking at the guide element 4, with a portion of the guide element 4 shown broken away in the area of ​​the counter blade 18. The illustrated alternative embodiment of the mower blade assembly 2 comprises a counter blade adjustment device 28 with a counter blade holder 30 and two elongated holes 32.1 and 32.2 in the guide element 4. The counter blade 18 is arranged on the counter blade holder 30. The counter blade 18 can be adjusted both vertically and angularly using the counter blade adjustment device 28. This allows the counter blade 18 to be easily adjusted so that the outer blade element 16.1 and the counter blade 18 make optimal contact and no cutting gap is formed. The counter blade holder 30 is then fixed to the guide element 4 by means of screw connections.This orientation allows for good cutting performance of the mower blade assembly 2, particularly in the area of ​​the counter blade 18. Furthermore, this design allows the counter blade 18 to be easily removed and reinstalled for repair, resharpening, or replacement.

Claims

1. A mower blade device (2) with a support structure and a cutterbar (6) fixed to the support structure, wherein the cutterbar (6) is designed as a double-blade cutting system and comprises an upper cutting blade (8) and a lower cutting blade (10), which are designed to be movable relative to each other via a drive of the mower blade device (2), wherein the upper cutting blade (8) has an upper blade back (12) and the lower cutting blade (10) has a lower blade back (14) and several blade elements (16) are respectively fixed to the upper blade back (12) and the lower blade back (14), which define a cutting plane (S) of the cutterbar (6), wherein the mower blade device (2) comprises at least one counter blade (18) which is fixedly arranged relative to the support structure and which interacts with an outer blade element (16.1) of the upper cutting blade (8) or the lower cutting blade (10), characterized in that the outer blade element (16.1) is arranged to project laterally beyond the upper blade back (12) or lower blade back (14) in the direction of the counter blade (18) (with respect to the latter).

2. The mower blade device according to claim 1, characterized by a guide element (4), in particular a guide plate, arranged laterally of a cutting area of the cutterbar (6).

3. The mower blade device according to claim 2, characterized in that the guide element (4) is arranged projecting forwards in the direction of travel (F) relative to the cutterbar (6) and, with increasing distance forwards in the direction of travel (F), has an increasing distance perpendicular to the cutting plane (S) of the cutterbar (6).

4. The mower blade device according to claim 3, characterized in that the guide element (4) is arranged in the area of the cutterbar (6) so as to project downwards relative to the cutting plane (S).

5. The mower blade device according to one of the preceding claims, characterized in that components of the mower blade device (2) arranged in an end area of the cutterbar are arranged to project 0 mm to 25 mm, preferably 10 mm to 20 mm, downwards in the direction of the ground relative to the cutting plane (S).

6. The mower blade device according to one of the preceding claims, characterized in that the support structure has at least one lateral cutterbar mounting section, on which the cutterbar (6) is fixed at one end to the support structure, wherein the cutterbar (6) is arranged below the cutterbar mounting section therein.

7. The mower blade device according to claim 6, characterized in that the drive is arranged at the end of the cutterbar (6) which is fixed to the support structure, and wherein a counter blade (18) cooperating with the lower cutting blade (10) is arranged in this area.

8. The mower blade device according to one of the preceding claims, characterized in that the outer blade element (16.1) is designed as a double blade element or multiple blade element.

9. The mower blade device according to one of the preceding claims, characterized in that the cutting edge of the outer blade element (16.1) cooperating with the counter blade (18) and the counter blade (18) enclose an angle of at most 30°, preferably an angle between 10° and 30°, particularly preferably an angle of 15°, in a top view of the cutting plane (S).

10. The mower blade device according to one of the preceding claims, characterized in that the counter blade (18) has a first sliding surface and the outer blade element (16.1) has a corresponding sliding surface, wherein the sliding surfaces are designed to cooperate for guiding the outer blade element (16.1).

11. The mower blade device according to one of the preceding claims, characterized in that a holding device (22, 24) for the lower blade back (14) or the upper blade back (12) is arranged adjacent to the counter blade (18), which holding device (22, 24) in particular has a deflector (26) aligned in the direction of travel (F) of the mower blade device (2) and at least partially covering the area to the guide element (4) when the upper and lower cutting blades (8, 10) move relative to each other.

12. The mower blade device according to claim 11, including claim 2, characterized in that the holding device (22, 24) comprises a conveyor element that moves the cut material away from the guide element (4) or forms such a conveyor element.

13. The mower blade device according to one of the preceding claims, characterized in that it comprises a swathing device.

14. The mower blade device according to one of the preceding claims, characterized by a counter blade adjustment device (28), by means of which the positioning and / or alignment of the counter blade (18) relative to the support structure can be adjusted.

15. The mower blade device according to claim 14, characterized in that the counter blade adjustment device (28) comprises a counter blade holder (30) on which the counter blade (18) is arranged, wherein the counter blade adjustment device (28) comprises elongated holes (32.1, 32.2) on which the counter blade holder (30) can be fixed in different positioning and / or orientation relative to the support structure via screw connections.