threshing ridge

Abstract

A harvester having a first rotor rotatably coupled to a chassis, a second rotor rotatably coupled to the chassis, and a ridge separating the first rotor from the second rotor. Wherein the ridge has a threshing insert coupled to the ridge to facilitate threshing of a crop being processed by the first rotor and the second rotor.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to a ridge in a dual-rotor threshing system, and more particularly to a ridge having a threshing insert received thereon. BACKGROUND

[0002] Many work machines, particularly those designed to harvest crops, utilize a rotating assembly to separate grain and the like from remaining plant matter, such as leaves, stalks, and stems. Dual-rotor threshing systems utilize two rotors to facilitate the separation of grain from a harvested crop. Dual-rotor threshing systems generally have two rotor assemblies. Each rotor assembly is generally formed by a substantially hollow cylinder having a corresponding rotor rotating therein. As the rotors rotate, any crop and matter located within the hollow cylinder is agitated and moved axially toward a rear portion of the rotating assembly, which generally has a separation section. As the rotors separate the grain from the remaining matter, the grain falls through a grate or the like along a lower portion of the rotating assembly. Once separated, the grain is further processed and temporarily stored in a storage tank of the work machine. The rotating assembly generally has a ridge running between the two rotors. The ridge provides structural support to the rotor assemblies while separating the two rotors. SUMMARY

[0003] One embodiment is a harvester having a first rotor rotatably coupled to a chassis, a second rotor rotatably coupled to the chassis, and a ridge separating the first rotor from the second rotor. The ridge has a threshing insert coupled to the ridge to facilitate threshing of a crop processed by the first rotor and the second rotor.

[0004] In one example of this embodiment, the ridge has a first curved profile directed toward the first rotor and a second curved profile directed toward the second rotor. In one aspect of this example, the threshing insert is coupled to the ridge along the first curved profile and the second curved profile.

[0005] Another example of this embodiment is a recess coupled to the ridge. In yet another example, the first rotor and the second rotor each have a threshing section that partially extends a length of the corresponding first rotor and second rotor, where the threshing insert is positioned along the threshing section. In one aspect of this example, the threshing insert is positioned along only the threshing section.

[0006] In yet another example of this embodiment, the threshing insert is permanently coupled to the spine. In another example, the threshing insert is removably coupled to the spine. In one aspect of this example, the spine has a plurality of coupler receivers formed therein that selectively receive fasteners to couple the threshing insert to the spine. In a portion of this aspect, the coupler receivers are spaced apart to couple the threshing insert therewith in a plurality of spaced apart orientations.

[0007] In another example of this embodiment, the surface of the spine adjacent to the threshing insert is substantially solid. In yet another example, the spine spans about thirty percent of the circumference of the first rotor and the second rotor.

[0008] Another embodiment of the present disclosure is a spine for a dual rotor harvester. The spine has a first surface of the spine facing a first rotor, a second surface of the spine facing a second rotor, and at least one threshing insert on the first surface and at least one threshing insert on the second surface. Further, the threshing insert is an extension extending from the corresponding first surface and second surface that facilitates a threshing process of the first rotor and the second rotor.

[0009] In one example of this embodiment, the first surface and the second surface are at least partially between the first rotor and the second rotor. In another example, the first surface and the second surface have an arcuate profile. In yet another example, the at least one threshing insert is removably coupled to the surface where the number and spacing of the threshing inserts on each of the first surface and the second surface is variable.

[0010] Yet another embodiment of the present disclosure is a method for manufacturing a harvester. The method includes providing a chassis, a first rotor, a second rotor, a spine, and at least one threshing insert, rotationally coupling the first rotor to the chassis along a first axis, rotationally coupling the second rotor to the chassis along a second axis, coupling the spine to the chassis such that at least a portion of the spine is between the first axis and the second axis, and coupling the at least one threshing insert to the spine. The threshing insert is configured to facilitate a threshing process of the first rotor or the second rotor.

[0011] One example of this embodiment includes coupling at least one recess to the spine. Yet another example includes removably coupling at least one threshing insert to the spine with fasteners. Another embodiment includes coupling a plurality of threshing inserts to the spine. BRIEF DESCRIPTION OF DRAWINGS

[0012] The above aspects of the present disclosure, as well as the manner of attaining them, will become apparent, and the disclosure itself will be better understood by reference to the following description of embodiments of the present disclosure taken together with the accompanying drawings, wherein:

[0013] Figure 1 This is a schematic side view of a harvester;

[0014] Figure 2 This is a perspective view of the dual-rotor threshing assembly;

[0015] Figure 3 yes Figure 2 A perspective view of the dual-rotor threshing assembly with the cover element removed;

[0016] Figure 4 yes Figure 2 A front cross-sectional view of the dual-rotor threshing assembly;

[0017] Figure 5 yes Figure 2 A perspective view of a portion of a dual-rotor threshing assembly;

[0018] Figure 6 yes Figure 2 A perspective view of the ridge of a dual-rotor threshing assembly;

[0019] Figure 7 This is a detailed view of one embodiment of the threshing and inserting assembly; and

[0020] Figures 8a to 8c These are schematic diagrams of different embodiments of the threshing insert.

[0021] In several views, corresponding reference numerals are used to indicate the corresponding parts. Detailed Implementation

[0022] For the purpose of promoting an understanding of the principles of this disclosure, reference will now be made to the embodiments described herein and illustrated in the accompanying drawings, and these embodiments will be described using specific language. However, it will be understood that this is not intended to limit the scope of the disclosure, and such changes and further modifications in the illustrated apparatus and methods, as well as such further applications of the principles of the disclosure illustrated therein, are what those skilled in the art would normally conceive of as to which this disclosure pertains.

[0023] exist Figure 1 The image shows an embodiment of a harvester or agricultural combine harvester 10, which has a chassis or frame 12 with one or more ground engagement mechanisms, such as wheels 14, that contact an underlying surface or ground. The wheels 14 are coupled to the chassis 12 and are used to propel the combine harvester 10 forward in a forward operating or traveling direction. The forward operating direction is... Figure 1The direction of travel is to the left. Operation of the combine 10 is controlled from the operator cab 16. The operator cab 16 can include any number of controls for controlling operation of the combine 10. A cutting table 18 is provided at the front end of the combine 10 and is used to harvest a crop, such as corn, and convey it to an inclined conveyor 20. The harvested crop is conveyed from the inclined conveyor 20 by a beater drum 22. As shown, the beater drum 22 directs the harvested crop through an inlet transition section 24 to an axial harvested crop processing unit 26. Figure 1 The harvested crop processing unit 26 can include a housing 34 and two rotor assemblies 36 disposed in the housing 34. Each rotor assembly 36 includes a hollow drum 38 to which crop processing elements are secured for a charging section 40, a threshing section 42, and a separating section 44. The charging section 40 is disposed at the front end of the axial harvested crop processing unit 26. The threshing section 42 and the separating section 44 are located downstream in the longitudinal direction and aft of the charging section 40. The drum 38 can be in the form of a truncated cone located in the charging section 40. The threshing section 42 can include a front section in the form of a truncated cone and a rear section in the form of a cylinder. The cylindrical separating section 44 of the drum 38 is located at the rear or aft end of the axial harvested crop processing unit 26.

[0024] Corn, chaff, and the like that falls through the threshing basket associated with the threshing section 42 and through the separating grate associated with the separating section 44 can be directed to a clean crop pathway assembly 28 having a blower 46 and screens 48, 50 with screen mesh. The screens 48, 50 can vibrate in the fore-aft direction. The clean crop pathway assembly 28 removes chaff and directs the clean corn through an auger 52 to an elevator for clean corn. As shown, the elevator for clean corn deposits the clean corn in a corn storage tank 30. The clean corn in the corn storage tank 30 can be unloaded by an unloading auger 32 to a corn wagon, trailer, or truck. The harvested crop that remains at the lower end of the lower screen 50 is again conveyed through an auger 54 and an overhead conveyor to the harvested crop processing unit 26. The harvested crop residue that is delivered at the upper end of the upper screen 48, which consists essentially of chaff and small straw particles, can be conveyed through a vibrating sheet conveyor 56 to an aft and lower inlet 58 of a crop residue pathway assembly 60. Figure 1 The harvested crop processing unit 26 can include a housing 34 and two rotor assemblies 36 disposed in the housing 34. Each rotor assembly 36 includes a hollow drum 38 to which crop processing elements are secured for a charging section 40, a threshing section 42, and a separating section 44. The charging section 40 is disposed at the front end of the axial harvested crop processing unit 26. The threshing section 42 and the separating section 44 are located downstream in the longitudinal direction and aft of the charging section 40. The drum 38 can be in the form of a truncated cone located in the charging section 40. The threshing section 42 can include a front section in the form of a truncated cone and a rear section in the form of a cylinder. The cylindrical separating section 44 of the drum 38 is located at the rear or aft end of the axial harvested crop processing unit 26.

[0025] Corn, chaff, and the like that falls through the threshing basket associated with the threshing section 42 and through the separating grate associated with the separating section 44 can be directed to a clean crop pathway assembly 28 having a blower 46 and screens 48, 50 with screen mesh. The screens 48, 50 can vibrate in the fore-aft direction. The clean crop pathway assembly 28 removes chaff and directs the clean corn through an auger 52 to an elevator for clean corn. As shown, the elevator for clean corn deposits the clean corn in a corn storage tank 30. The clean corn in the corn storage tank 30 can be unloaded by an unloading auger 32 to a corn wagon, trailer, or truck. The harvested crop that remains at the lower end of the lower screen 50 is again conveyed through an auger 54 and an overhead conveyor to the harvested crop processing unit 26. The harvested crop residue that is delivered at the upper end of the upper screen 48, which consists essentially of chaff and small straw particles, can be conveyed through a vibrating sheet conveyor 56 to an aft and lower inlet 58 of a crop residue pathway assembly 60.

[0026] The foregoing blower 46 creates an airflow that carries a large amount of chaff and small particles to the rear of the combine and the crop residue pathway assembly 60. The blower 46 is capable of providing three or more air paths within the interior of the combine. A first air or flow path can pass through the front of the combine 10. A second air or flow path can be above the lower sieve 50 and below the upper sieve 48 or beater. A third air or flow path can be below the lower sieve 50. All three air or flow paths occupy the combine body and can create a pressurized airflow to pick up and carry the straw, grain, and other residue or particles to the rear of the combine 10.

[0027] The threshed straw exiting the separation section 44 is discharged from the harvested crop handling device 26 through an outlet 62 and is conveyed to a discharge cylinder 64. The discharge cylinder 64 or discharge beater interacts with a sheeting 66 disposed below it to discharge the straw to the rear and to direct the grain and material other than grain (hereinafter “MOG”) through the clean crop pathway assembly 28. A wall 68 is located at the rear of the discharge cylinder 64. The wall 68 directs the straw into an upper inlet 70 of the crop residue pathway assembly 60.

[0028] The crop residue pathway assembly 60 can include a housing 72 (i.e., a chopper housing) in which a rotor 74 is disposed that can be rotated in a counterclockwise direction about an axis that extends transversely to the direction of operation and horizontally. The rotor 74 can include a plurality of chopper blades 76 that are dependently suspended in pairs and distributed about the circumference of the rotor 74 that interact with opposing blades 78 that are fixed to the housing 72. Two impeller blower fans 82 that are arranged side-by-side along the edges of one another can be provided downstream of an outlet 80 of the crop residue pathway assembly 60. In Figure 1 Only a single blower fan 82 is shown in the FIGURE. The impeller blower fan 82 can include a plurality of impeller blades 84 that are each rigidly connected to an upper disc 86 that can be rotated about a central axis 88. The disc 86 with radially extending impeller blades 84 can be rotationally driven by a hydraulic motor 90 that is attached above a floor sheet 102 that is connected with the housing 72 of the crop residue pathway assembly 60. The impeller blades 84 are connected at their radially inner ends to a cylindrical central body 92 that transitions to a cone 94 with a pointed tip on its end that faces away from the disc 86. The impeller blades 84 can be rectangular and the height of the body 92 (exclusive of the cone 94) can be equal to the height of the impeller blades 84. The cross-section of the body 92 and cone 94 can be circular, although the cross-section can also have a multi-faceted shape.

[0029] Although Figure 1One type of combine harvester 10 is shown, but the teachings of the present disclosure are not limited to the particular combine harvester 10 shown and described herein. Rather, the teachings of the present disclosure can be applied to any type of harvester that utilizes more than one axial crop harvesting device. More specifically, any type of crop harvester having a spine portion separating axial crop harvesting devices can utilize the teachings discussed herein, and the present disclosure is intended to apply to any such machine. Figure 1 The embodiments of the present disclosure are shown and described merely as one non-exclusive example of a combine harvester 10. Figure 1 The embodiments of the present disclosure are shown and described merely as one non-exclusive example of a combine harvester 10.

[0030] Referring now to Figure 2 , one embodiment of a dual rotor threshing assembly 200 is shown. The dual rotor threshing assembly 200 can include a first rotor assembly 202 and a second rotor assembly 204 having rotors rotatably coupled to a chassis 12 of the combine harvester 10 therein. The rotors of the first rotor assembly 202 and the second rotor assembly 204 can be rotatably coupled to the chassis 12 with any number of brackets or the like, and can be directly non-rotatably coupled to the chassis 12. Further, the rotors can be rotatably coupled to the chassis 12 to rotate about corresponding first and second axes of rotation 206, 208. In this configuration, the harvested crop can enter the first rotor assembly 202 or the second rotor assembly 204 through the inlet 24. Further, the combine harvester 10 can selectively rotate the rotors of the rotor assemblies 202, 204 by mechanical linkage with a prime mover, a hydraulic motor, an electric motor, a pneumatic motor, or any other known system for rotating the assemblies.

[0031] The first rotor assembly 202 and the second rotor assembly 204 can each have one or more cover elements 210 along an upper portion of the corresponding assembly 202, 204. The cover elements 210 of the first rotor assembly 202 can extend from a first side member 214 to a spine portion 212. Similarly, the cover elements 210 of the second rotor assembly 204 can extend from the spine portion 212 to a second side member 216. Each cover element 210 can have an arcuate profile to partially form a cylindrical cavity for the corresponding first and second rotors, as shown in Figure 4 Further, the spine portion 212, as well as the first and second side members 214, 216, can be part of, or otherwise coupled to, the chassis 12.

[0032] Referring now to Figure 3 , the dual rotor threshing assembly 200 is shown with the cover elements 210 removed. More specifically, Figure 3A first rotor 302 as part of the first rotor assembly 202 and a second rotor 304 as part of the second rotor assembly 204 are shown. The rotors 302, 304 can be powered to rotate about corresponding axes 206, 208 to assist in the separation of grain from MOG, among other things. More specifically, the rotors 302, 304 can rotate within a cylindrical cavity defined in part by the cover element 210, the ridge 212, the corresponding first or second side member 214, 216, and the corresponding concave plate 406 (see Figure 4 ). As the rotors 302, 304 rotate within their corresponding cylindrical cavities, the harvested crop is agitated, and the grain and MOG fall through the concave plate 406 to be further processed and separated.

[0033] Each of the rotor assemblies 202, 204 can have a loading section 306, a threshing section 308, and a separating section 310. The loading section 306 is disposed at a front end of each rotor 302, 304. The threshing section 308 and the separating section 310 are located downstream in the longitudinal direction and are located rearward of the loading section 306, with the threshing section 308 being located between the loading section 306 and the separating section 310. The rotors 302, 304 can be in the form of a truncated cone located in the loading section 306. The threshing section 308 can include a front section in the form of a truncated cone and a rear section in the form of a cylinder. The separating section 310, which is in the form of a cylinder, is located at a rear or end of each rotor 302, 304.

[0034] The ridge 212 can have one or more threshing inserts 312 located thereon. The threshing inserts 312 can be located on two different portions of the ridge 212. More specifically, the threshing inserts 312 can be located on a portion of the ridge 212 that faces the first rotor 302, and the threshing inserts 312 can be located on a portion of the ridge 212 that faces the second rotor 304. The threshing inserts 312 can be extensions that extend from the corresponding surface of the ridge 212, with the extensions extending radially inward toward the corresponding rotor 302, 304. In an aspect of the present disclosure, the threshing inserts 312 can further agitate any crop material in the corresponding rotor assembly 202, 204 as the corresponding rotor 302, 304 rotates. By further agitating the crop, the threshing inserts 312 can improve the efficiency and speed of the separation of grain from MOG. This improvement in efficiency and speed can allow the combine 10 to harvest crops more efficiently and at a faster rate than existing designs.

[0035] The threshing inserts 312 can be positioned along any portion of the ridge 212. More specifically, the threshing inserts 312 can be positioned along the arcuate portions of the ridge 212 to ensure that the threshing inserts 312 agitate the crop as the rotors 302, 304 rotate. Further, the threshing inserts 312 can be positioned along the ridge 212 in the loading section 306, the threshing section 308, and the separating section 310. However, in one non-exclusive embodiment, the threshing inserts 312 can be positioned only along the threshing section 308 of the threshing assembly 200.

[0036] Referring now to Figure 4 , a cross-sectional view of the threshing assembly 200 along the threshing section 308 is shown. More specifically, the cylindrical cavities in which the rotors 302, 304 are positioned are shown more clearly. The cylindrical cavities can be defined in part by the cover elements 210 coupled at one end to the ridge 212 and at the other end to the corresponding first side member 214 or second side member 216. The ridge 212 can have a first surface 402 and a second surface 404 having a first curved profile and a second curved profile that partially define the corresponding first cylindrical cavity and second cylindrical cavity. Further, the recessed plate 406 can extend between the ridge 212 and the corresponding first side member 214 and second side member 216. In this configuration, each cylindrical cavity in which the corresponding rotor 302, 304 is positioned is defined by the combination of the cover element 210, the ridge 212, the corresponding first side member 214 or second side member 216, and the recessed plate 406.

[0037] In one aspect of the present disclosure, the ridge 212 can define an inner surface of the cylindrical cavities that extends about 30% of the entire circumference of the corresponding wall of the cylindrical cavities. In other words, the cover elements 210 and the recessed plate 406 can define the majority of the circumferential wall of the cylindrical cavities in which the rotors 302, 304 are positioned, but the ridge 212 can at least partially define a portion of the cylindrical cavity wall. More specifically, Figure 5 The rotor assembly 200 is shown with the loading section 306 of the first rotor 302 and a portion of the threshing section 308 removed. As shown in Figure 5 , the ridge 212 can define a substantially solid surface that defines the portion of the cylindrical wall adjacent to the rotors 302, 304. Further, the threshing inserts 312 can be coupled to the solid surface of the ridge 212 to extend radially toward the corresponding rotor 302, 304 to further agitate the crop as it passes through the crop during a harvesting operation.

[0038] In Figure 6In particular embodiments, the ridge 212 is shown to be isolated from the rotors 302, 304 and the pan 12. More particularly, threshing inserts 312 are shown to be coupled to the radially inner surface of the ridge 212. The threshing inserts 312 can be removably coupled to the inner surface in different patterns to accommodate different threshing needs. For example, in Figure 8a embodiments, there can be eight or more threshing inserts 312 coupled to the ridge 212 along each of the first rotor 302 and the second rotor 304. Alternatively, in Figure 8b another embodiment shown, every other threshing insert 312 can be removed and only four threshing inserts 312 can be coupled to the ridge 212 along each of the first rotor 302 and the second rotor 304. Further, in Figure 8c embodiments, there can be no threshing inserts 312 coupled to the ridge 212.

[0039] While specific examples of threshing inserts are discussed herein, the present disclosure contemplates having more than eight threshing inserts and also contemplates having less than four threshing inserts. More particularly, any number of threshing inserts 312 can be used herein to accommodate needs caused by different harvesting conditions. Still further, the first rotor assembly 202 and the second rotor assembly 204 can have different configurations of threshing inserts 312 along the corresponding rotors 302, 304. In yet another embodiment, the threshing inserts 312 can not be spaced evenly from one another as they are in Figure 8a and Figure 8b Thus, any configuration of threshing inserts 312 can be coupled to the ridge 212 to accommodate different crop conditions.

[0040] Referring now to Figure 7 , one non-exclusive example of a threshing insert 312 is shown. More particularly, each threshing insert 312 can be coupled to the ridge 212 through one or more coupler receptacles 702. The coupler receptacles 702 can selectively receive fasteners 704 or the like therein to selectively couple the threshing insert 312 to the ridge 212. In this configuration, the ridge 212 can have pairs of coupler receptacles 702 spaced apart from one another. One or more threshing inserts 312 can be selectively coupled to one or more coupler receptacles 702 based on harvesting conditions. For example, in a first harvesting condition, a threshing insert 312 can be coupled to each pair of coupler receptacles 702 along the ridge 212 to maximize crop agitation. Alternatively, in a second harvesting condition, only every other pair of coupler receptacles 702 can have a threshing insert 312 coupled thereto. Still further, in a third harvesting condition, no threshing inserts 312 can be coupled to the ridge 212 along the pairs of coupler receptacles 702.

[0041] In one aspect of the present disclosure, the ridge 212 can extend between the first axis 206 and the second axis 208 to provide structural support for the threshing assembly 200. The ridge 212 can have a first curved profile directed toward the first rotor 302 and a second curved profile directed toward the second rotor 304. The threshing insert 312 can have any cross-section capable of agitating the crop. In one non-exclusive example, the threshing insert 312 can be formed from a key device or the like and can have a rectangular or circular cross-section. However, other shaped cross-sections are contemplated herein as well. Further, in one aspect of the present disclosure, the threshing insert 312 can extend substantially parallel to the corresponding axis 206, 208. However, in another embodiment, the threshing insert is offset relative to the corresponding axis 206, 208.

[0042] While the present disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description is to be considered exemplary and not restrictive in character, it being understood that only exemplary embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected. It is noted that alternative embodiments of the present disclosure can not include all of the features described, but can still benefit from at least some of the advantages of the features. One of ordinary skill in the art can readily devise their own implementations that incorporate one or more of the features of the present disclosure and fall within the spirit and scope of the application as defined by the appended claims.

Claims

1. A harvester comprising: a first rotor (302) rotatably coupled to a chassis (12) along a first axis; a first cover element and a first concave plate positioned partially around the first rotor to define a first cavity of a portion of the first rotor; a second rotor (304) rotatably coupled to the chassis (12) along a second axis; a second cover element and a second concave plate positioned partially around the second rotor to define a second cavity of a portion of the second rotor; a ridge (212) separating the first rotor (302) from the second rotor (304) and having a first surface and a second surface that are solid; wherein the ridge (212) is connected to the first cover element and the first concave plate to partially define the first cavity, the ridge (212) is connected to the second cover element and the second concave plate to partially define the second cavity, the ridge (212) has a threshing insert (312) coupled to the first surface and the second surface to facilitate threshing of a crop processed by the first rotor (302) and the second rotor (304), the threshing insert is parallel to the first axis of the first rotor and the second axis of the second rotor along a threshing portion of the ridge.

2. The harvester of claim 1, wherein, the ridge (212) has a first curved profile directed toward the first rotor (302) and a second curved profile directed toward the second rotor (304).

3. The harvester of claim 2, wherein, the threshing insert (312) is coupled to the ridge (212) along the first curved profile and the second curved profile.

4. The harvester of claim 1, wherein, the first rotor (302) and the second rotor (304) each have a threshing section (308) that partially extends a length of the corresponding first rotor (302) and second rotor (304), wherein the threshing insert (312) is positioned along the threshing section (308).

5. The harvester of claim 4, wherein, the threshing insert (312) is positioned only along the threshing section (308).

6. The harvester of claim 1, wherein, the threshing insert (312) is permanently coupled to the ridge (212).

7. The harvester of claim 1, wherein, the threshing insert (312) is removably coupled to the ridge (212).

8. The harvester of claim 7, wherein, the ridge (212) has a plurality of coupler receivers (702) formed therein that selectively receive fasteners (704) to couple the threshing insert (312) to the ridge (212).

9. The harvester of claim 8, wherein, the coupler receivers (702) are spaced to couple the threshing insert (312) therewith in a plurality of spaced orientations.

10. The harvester of claim 1, wherein, a surface of the ridge (212) adjacent the threshing insert (312) is solid.

11. The harvester of claim 1, wherein, the ridge (212) spans at least thirty percent of a circumference of the first rotor (302) and the second rotor (304).

12. The harvester of claim 1, wherein, The threshing insert (312) is an extension from a corresponding surface of the ridge (212) that assists the threshing process of the first rotor (302) and the second rotor (304).

13. The harvester of claim 1, wherein, The threshing insert (312) is at least partially located between the first rotor (302) and the second rotor (304).

14. The harvester of claim 1, wherein, The threshing insert (312) is removably coupled to a surface of the ridge (212), wherein the number and spacing of the threshing inserts (312) is variable.

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