Scraper roller and arrangement of a scraper roller on a seed coulter

Abstract

Especially in seed drills that operate with the horizontal slot system, cleaning the coulter disc is of great importance. On the other hand, especially when coulters are equipped with seed singulation devices, it is important that the seeds are well embedded and their position is precisely defined. The present invention fulfills both of these tasks equally. The invention relates to a so-called stripping roller (50) which is mounted on a sowing coulter of an agricultural machine for spreading seed and / or fertilizer and which rolls in a seed slot formed by a furrow-forming tool on the sowing horizon, wherein said roller is positioned immediately to the side of the coulter disc and slides on the coulter disc.

Description

3.1 State of the art

[0001] Seed coulters for sowing seeds come in a wide variety of variations. These can be divided into tine and disc coulter technology. Disc coulter technology, in turn, can be divided into single-disc and double-disc coulters. Hybrid solutions combining disc and tine coulter technology are also used. A horizontal slotted coulter of this type is described in US4275671, US5269237, US6644226, US20130319702A1, and US20070272134A1. This coulter system also bears the protected name CrossSlot®. Furthermore, a distinction can be made according to the quality of the longitudinal distribution, i.e., whether a coulter is equipped with a singulation system or not. Examples of sowing elements with seed singulation include standard double-disc coulter precision seed drills, as described or illustrated, for example, in EP2022307B1 and WO2020112015A1. A single-disc coulter with grain singulation is described in EP3340767B1.A single-disc coulter without grain singulation is disclosed, for example, in US4760806. Particularly when grain singulation units with overpressure singulation systems are used, so-called catch rollers, as described, for example, in WO2020112015A1 or EP2982229A1, are important. Their task is to position the seed, which may be fed at high speed, at the seeding horizon by rolling over it and to prevent, as far as possible, a relative speed between the seed and the soil. On the side of the coulter disc(s) facing away from the seed, elements are often used on disc coulter seed drills whose task is to clean the coulter disc(s), for example, through integrated scraper lips on various depth control wheels, as shown in US4760806 or WO2020112015A1.

[0002] When using the horizontal slitting technique or sowing systems with coulter discs that are not angled to the direction of travel, cleaning the coulter disc on the seed side is of great importance under adverse conditions or when using on a side slope, as soil tends to stick there too due to the lack of an angle. Clods of soil sticking to the disc can, on the one hand, carry seed out of the seed slit and, on the other hand, subsequently block the upper area of ​​the sowing element. In very clayey soils there is also a risk that a layer of soil will build up on the disc. In the horizontal slitting technique, the task of scraping is performed by a scraper finger, as described in US5269237. This scraper finger is positioned behind the seed shoe and is attached or pre-tensioned in a similar way to the seed shoe. The coulter disc is scraped in the area between the sowing horizon and the soil surface. 3.2 Objects of the invention

[0003] Part of the present invention is to provide a machine element that is capable of cleaning the coulter disc on the seed side and at the same time precisely braking and embedding fed seed at the sowing horizon.

[0004] Another part of the invention is to influence the friction conditions that occur in a targeted manner by means of special geometries or the like, so that both tasks can be optimally fulfilled.

[0005] Another part of the invention is the fastening or connection to the share frame, which also achieves advantageous effects.

[0006] Another part of the invention is an eccentric-based adjustment option, which allows the scraper roller to be adjusted in terms of its aggressiveness. 3.3 Detailed description of the invention

[0007] The present invention relates to a so-called stripping roller, which can be mounted on a disc seed coulter, in particular on a horizontal slotted coulter. In this case, the stripping roller rolls, relative to the direction of travel, behind a seed shoe in the shaped seed slot over the previously deposited seeds at the seeding horizon, similar to known singling technology with catching rollers. If singling dosers with an overpressure system are used, the seeds are shot into the wedge gap between the seeding horizon 27 and the running surface 44 by means of a shot tube 41. Such a process of being clamped between the ground and the running surface is disclosed, for example, in EP3340767B1. Unlike catching rollers in known coulter assemblies from single-seed technology, the stripping roller slides laterally along a coulter disc to simultaneously achieve a cleaning effect of the coulter disc. Furthermore, it prevents soil or seeds from being expelled from the seed slot by the coulter disc.The cleaning of the side of the coulter disc facing away from the seed is not the task of the scraper roller; this can be done, for example, by a depth control wheel arranged similarly to the characteristics of a single-disc coulter.

[0008] The design, construction, and guidance or mounting of the stripping roller 50 underlying the present invention ensure that both the embedding and braking of the seeds, as well as the disc cleaning, can be performed with high quality. This enables the practical use of a singulating metering device with an overpressure system on a horizontal slit coulter. At the same time, the stripping roller can also be advantageously used if no singulating metering device is installed, since with the stripping roller the cleaning process can be carried out with considerably lower friction compared to strippers from US5269237. This design is therefore also advantageous with regard to the tractive force requirement, since the problem of blocking of the coulter disc 1 is reduced and thus the toothing of the coulter disc 1 and its necessary undercut below the sowing horizon 27 can be reduced or reduced.

[0009] The object underlying the invention is to combine these two functions in the component stripping roller 50, in that on the one hand it rolls over the seeds in the seed slot and on the other hand it slides laterally on the coulter disc 1. The stripping roller essentially consists of an elastic and soft tire element 45, one or more stripping elements 46, and a rotatable bearing, for example the stripping roller bearing 49. It is also conceivable to dispense with rim elements 47, in that the tire element itself represents the bearing seat of the stripping roller bearing 49 (see Fig. 7). One or more scraper elements 46 can be integrated into both the tire element 45 and a rim element 47. The preferred embodiment consists of a plate-shaped scraper element 46, which is integrated into a rim element 47 or simultaneously represents a rim element 47. At the same time, the circumferential outer edge of the tire element 45, which rests against the coulter disc 1, also serves as a scraper element 46. A rigid scraper ring integrated into the tire element is also conceivable as the scraper element 46 instead of the outer edge. The scraper roller 50 is rotatably mounted by the scraper roller bearing 49, for example, by a rolling bearing. This scraper roller bearing can be guided either rigidly or movably.

[0010] A key challenge is to control or specifically influence the fluctuating forces that occur during the stripping process so that the stripping roller can optimally fulfill its function. It is crucial to minimize the slippage of the tire element 45 at the sowing horizon 27 caused by the braking effect during the stripping process.

[0011] The part of the invention described below ensures that the rotational axis of the scraper roller bearing 49 is not parallel to the rotational axis of the coulter disc 1, but rather rotated delta by the inclination of the coulter roller. This ensures that the contact area or lateral pressure between the coulter disc 1 and the scraper roller 50 is primarily limited to the front, lower area of ​​the scraper roller 50. This, in turn, ensures that the coulter disc 1 tends to drive the coulter disc more than it is decelerated in the upper, counter-rotating area. Furthermore, the scraping effect is improved.The catch roller inclination delta can be made so small that the elastic tire element can compensate for the axial deviations due to the catch roller inclination delta and thus the outer scraper element 46, be it a circumferential outer edge or integrated scraper plate, still rests fully on the coulter disc (apart from the projection of the scraper catch roller beyond the coulter disc radius). The catch roller inclination delta can also be selected so high that ultimately a slight lifting of the upper circumferential area of ​​the scraper catch roller results. The catch roller inclination delta refers to an angular range of 0°<= delta <3°, in particular an angular range of 0°<= delta <2°. However, the fan roller inclination delta does not refer to the angular deviation from the catch roller rotation axis to the disc normal of usually over 4° from existing single-grain technology, which results from the angle of attack of the coulter discs.In such share systems, the catcher roller only comes into contact with a coulter disc in exceptional cases, for example when the catcher roller is axially deformed by a stone, etc., which is why the structure and arrangement are fundamentally different.

[0012] If the scraper roller is designed with the preferred plate-shaped rim element 47, which also represents a scraper element 46, with less elasticity than the tire element 45, very high lateral preload forces can be achieved in a very targeted manner, while at the same time the contact area can be kept very specifically in the lower region. In this case, this plate-shaped rim element 47 is preferably made of a metallic material. If the aforementioned plate-shaped rim element 47 has a smaller diameter or contact radius than the tread 44 of the tire element rolling in the sowing horizon 27, a transmission effect results, which provides additional drive to the scraper roller, which tends to run too slowly, and counteracts the slippage problem.

[0013] On the other hand, it is a major challenge to keep the radial pressure acting on the sowing horizon 27 low, while at the same time preventing the scraper roller from lifting off due to frictional forces occurring on the coulter disc 1. It is also necessary to absorb the kinetic energy of the grains completely and evenly despite low radial pressure. Part of the present invention is to keep the positioning of the scraper roller bearing 49 relative to the sowing shoe 2 constant by means of a scraper roller holder 51 that is rigidly guided in the normal working range. The elastic and easily deformable tire element 45 compensates for unevenness and thus follows the contour in the sowing horizon 27 through a flexing movement. This makes it possible to achieve very high lateral preloads on the coulter disc 1 without risking the tire element 45 lifting off the sowing horizon 27.At the same time, the scraper roller holder 51 can provide overload protection through its bearing, in that the catcher roller can deflect upwards once a certain triggering force is reached. The preferred embodiment 53 consists, among other things, in that the scraper roller holder 51 is mounted on a rigid part of the sowing coulter, for example on the sowing shoe holder 9, by means of a rubber bushing 52. The rubber bushing 52 enables cardanic preload of the rubber bushing, primarily through the rubber bushing preload angle gamma, which in turn effects the lateral preload of the scraper roller 50 and the coulter disc 1. The rubber bushing preload angle gamma is limited to an angular range of 0°<= gamma <45°, in particular an angular range of 0°<= gamma <10°.At the same time, the rubber bushing 52 enables preloading by means of a torsional torque pointing in the rotational axis of the rubber bearing 52, in that the scraper roller holder 51 is supported on a rigid stop 76 connected directly or indirectly to the side element 5. However, it is also conceivable to keep the torsional preload so low that the contour of the sowing horizon 27 is followed by constant movement of the scraper roller holder 51 and not only by the internal deformation of the tire element 45.

[0014] A rigid attachment to the seed shoe holder 9 or to the side element 5 of an inherently elastic scraper roller holder 51, which can also be supported on the stop 76 or the like, is also conceivable. The side element 5 is the component or assembly to which the seed shoe 2 is attached, or to which the seed shoe 2 is attached by means of the seed shoe holder 9. In the case of a parallelogram guide of the seed coulter 21, the side element(s) 5 are guided in the parallelogram.

[0015] Another part of the present invention is that, through a special design of the elastic tire element 45, in the event of radial compression, the tread of the tire element 45 simultaneously tends to move sideways. This is achieved by the oblique geometries of the connecting profile(s) 43. Because the tread is laterally delimited by the coulter disc 1, the normal pressure between the coulter disc 1 and the tire profile 45, which is the basis of the friction forces, is correspondingly increased precisely in the lower radially deformed area of ​​the tire profile 45. This not only increases the scraping effect of the tire element 45, but also favorably influences the rotational speed of the scraper roller (50) due to the advantageous tangential friction forces in this area. Conversely, this makes a very good scraping effect possible, even though the tire element 45 orwhose scraper element 46 is possible over its entire circumference without the entire outer region of the tire element 45 sliding on the coulter disc 1 having to be pre-tensioned with high pressure. As a result, the normal pressure and thus the "braking" friction forces can be very effectively reduced in the upper region of the scraper catch roller 50, where the friction forces of the coulter disc 1 act against the direction of rotation. The connecting profile inclination beta can be designed in a variety of ways to achieve advantageous effects. It is conceivable to integrate the inclination into a Z-shaped profile of the tire element (see . Fig. 1a-c). A hollow chamber profile with inclined side walls, which represent the connecting profiles 43, is also conceivable (see Fig. 1d. The connection profile inclinations beta of the individual connection profiles 43 can have different values. Different signs of the connection profile inclinations beta are also conceivable (see Fig. 4d). The connecting profiles 43 can also have different wall thicknesses s (see Fig. 4d). The plate-shaped connecting profiles can also have a curved cross-section. In this case, the connecting profile inclination beta refers to a straight line passing through its start and end area (see Fig. 4b, d). A further possible embodiment is to design the tire element 45 with spokes, wherein the elongated cross-sectional profiles of the spokes or connecting profiles 43 are inclined by the connecting profile inclination beta (see Fig. 2 or Fig. 3). This ensures that when the spokes are compressed and their curvature changes, the tread 44 also tends to deflect laterally towards the coulter disc 1, and the constraining force preventing deflection also allows the advantageous local increase in frictional force to be achieved. The design of a spoked tire element 45 (see Fig. 2, Fig. 3) has the further advantage that the self-cleaning effect of the scraper roller 50 is better than with spoked inelastic rim elements (see Fig. 1). The use of straight-spoked tire treads is known from catch rollers in the field of double-spread systems. Such a design is disclosed, for example, in WO2020112015A1 or EP2982229A1. It should be noted that, in contrast to the latter patent applications, the present invention includes the targeted inclination of the spokes, which radially compresses the tread, creating an additional lateral constraining force. This contrasts with the aforementioned patent applications, where the spokes only serve to provide radial elasticity.

[0016] Another possible execution is in Fig. 7. Here, for example, the elastic tire element 45 directly represents the bearing seat of the wiper roller bearing 49, without a rim element 47 establishing the connection between the wiper roller bearing 49 and the tire element 45. Fig. 7a shows a design variant in which two inelastic, preferably metallic scraper rings are integrated, which function as scraper elements 46. The inner scraper ring serves as the primary lateral support on the coulter disc 1. The outer scraper ring is radially movable relative to the inner scraper ring by the elastic, preferably spoked tire element 46. If this design variant of the scraper roller 50 is guided with the scraper roller inclination delta, a wobbling movement occurs between the two scraper rings relative to each other. Due to the radial elasticity of the tire element 46 and the resulting possible axial offset between the two scraper rings, it is possible to guide the scraper roller bearing 49 rigidly or more rigidly, similar to the design variants from Fig. 2 and Fig. 3. However, this design variant is advantageous in that the outer scraper element 46 in the form of a metallic scraper ring is correspondingly more durable. However, due to the reduced flexion movement, the self-cleaning effect of the running surface 44 is poorer. In order to still achieve a certain self-cleaning effect of the running surface, a Fig. 7, is advantageous because, despite the stabilizing scraper ring, a certain radial deformability and thus a flexing movement is achieved. Preferably, the cross section of the circumferential profile on the running surface 44 is reduced at a specific point, as shown in Fig. 7a, for example, in the form of a circumferential semicircular groove. This serves to maintain contact between the tire element 45 and the scraper ring acting as a scraper element 46 during radial deformation or rotation of the tread 44. This ensures that the section of the tire element 45 facing the coulter disc 1 remains virtually undeformed despite deformation of the tread or the tread-forming web. The fact that the tire element 45 does not lift off the scraper ring acting as a scraper element 46 prevents soil particles from accumulating or depositing between them.

[0017] It is also conceivable, in a further respect, to utilize the previously described effect of the tire profile tending toward lateral displacement by means of diagonally spoked tire profiles 46, in that upon radial compression, the tread of the tire profile moves away from the coulter disc 1, thereby achieving a lateral displacement of the seeds away from the coulter disc 1. However, this arrangement comes at the expense of the stripping effect.

[0018] Part of the present invention is to achieve an adjustment option with regard to the working intensity of the stripping roller 50 by means of the eccentric bearing axis 48, which represents the connecting element between the stripping roller holder 51 and the stripping roller 50, through the adjustability of the position of the stripping roller bearing 49. By specifically adjusting the distance between its axis of rotation and the sowing horizon 27, the deformation intensity and thus the stripping effect and seed embedding can be influenced. The change in this distance results from rotating the eccentric bearing axis. The eccentricity of the stripping roller axis E_f represents the offset of the axis of the stripping roller bearing 49 from the axis of the circular recess in the stripping roller holder 51. The circular recess determines the radial position of the eccentric bearing axis 48.This is done, for example, with the fastening screw in the eccentric threaded hole and thus also eccentrically positioned (see . Fig. 1d). Another possible design is to position the eccentric bearing axis 48 on the scraper roller holder 51 using the eccentric shoulder 90 (see Fig. 1b). This design is advantageous because it allows for greater eccentricity and can be cheaper to produce. The angle of rotation is determined by the open-end wrench, which is required in the assembly process anyway. 2.4 Description of the characters

[0019] In the Fig. 1 shows variants of the wiping rollers 50, where the tire element 45 is mounted on a rigid, preferably spoked rim element 47. Preferably, a metallic rim element forms the second rim half, whereby this rim element 47 is plate-shaped and its outer peripheral edge on the six-disk side simultaneously serves as a wiping element 46. The two rim elements are preferably connected to each other by means of screws. Fig. 1b, Fig. 1c and Fig. 1d different versions of the tire elements 45 can be seen. These are connected to the Fig. 4 described separately. In Fig. 1b shows a variant of the eccentric bearing axis 48, which achieves the positioning option through the eccentric shoulder 90 on the scraper roller holder 51. In Fig. 1d shows a variant of the eccentric bearing axis 48, which achieves the positioning possibility by means of a screw (not shown) mounted in the eccentric core bore on the scraper roller holder 51.

[0020] In Fig. 2 shows a variant of a scraper roller 50, wherein the tire element 45 is of a spoked design. The tire element is attached to a rim, which together constitute the two rim elements 47. The six-disk-side rim element 47 is preferably rigid and wear-resistant and simultaneously represents a scraper element 46. The diameter of the rim elements 47 is kept as small as possible so that the ratio of tread diameter to rim diameter is as large as possible. As a result, the spoked design allows the tire element 45 to exhibit high radial deformability. Due to the spokes, which are inclined about the connecting profile position beta and represent the connecting profiles 43, an axial constraining force is generated upon radial deformation ( Fig. 2c), as described previously.

[0021] In Fig. 3 shows a variant of a tire element, where the characteristic from Fig. 1 and Fig. 2. The tire element 45 is designed with an oblique spoke pattern in the inner diameter region and a circumferential profile in the outer region, for example, a Z-shaped profile. The connecting profile inclination beta refers, on the one hand, to the obliqueness of the connecting profiles 43 defined by the spokes, and, on the other hand, to the obliqueness of the connecting profile(s) 43 of the circumferential cross-section in the outer region, for example, the Z-shaped profile.

[0022] In Fig. 4 different tire elements 45 are shown. In Fig. 4a shows a Z-shaped tire profile. The plate-shaped section of the Z-profile represents the connecting profile 43 in this embodiment. The connecting profile 43 can also be Fig. 4a, have a non-constant wall thickness in order to achieve positive effects during radial compression and expansion. As shown in Fig. As can be seen in Figure 4b, the connecting profile 43 can also be curved to achieve certain effects. Fig. Figure 4c shows a hollow chamber profile as tire element 45, in which both sidewalls or connecting profiles 43 have a positive connecting profile inclination beta. The values ​​of the connecting profile inclinations can vary. The wall thicknesses s can also be different and vary along the cross-section. Fig. Figure 4d shows another hollow chamber profile, where the signs of the connecting profile inclinations beta are different. In this case, different wall thicknesses are also shown. The connecting profiles 43 are curved. Fig. 4e shows a combined Z-shaped-spoke-shaped tire element 45, which in Fig. 3 is described in more detail. In Fig. 4f shows a tire element 45 which is in Fig. 2 is described in more detail. In Fig. 4g. shows a tire element 45 with two integrated scraper elements 46.

[0023] In Fig. 5 shows the arrangement of the scraper roller on the coulter in the side view of the coulter.

[0024] In Fig. 6 shows the connection of the scraper roller 50 with the seed shoe holder 9. The preferred design variant is shown using a rubber bushing 52. In Fig. 6b, on the one hand, the scraper roller inclination delta is indicated by the scraper roller axis not being perpendicular to the coulter disc, but being rotated by the scraper roller inclination delta. Furthermore, the cardanic preload of the rubber bushing 52, caused by the rubber bushing preload angle gamma, is visible. Fig. 6a also shows the stop 76, against which the stripping roller holder 51 is supported. Furthermore, it is clear how, for example, the shot tube 41 or the seed tube 10 are arranged to enable the seed to be fed either singly or non-singly.

[0025] In Fig. Figure 7 shows a variant of a scraper roller 50 in which two rigid scraper elements 46 are integrated into a flexible tire profile 45. The two scraper rings acting as scraper elements 46 are preferably made of metal. The cross-sectional profile of the scraper rings is preferably bent in order to achieve a plate-shaped scraper element with a larger diameter than the tread 44, and to generate a correspondingly large pressure surface for both radial and axial load cases. This prevents the scraper ring from drilling into the tire element 45. The conical design of the part of the scraper ring surrounded by the tire element 45 ensures that the latter is axially secured. Fig.Figure 7a shows that a tire element 45 can be connected directly to the scraper roller bearing, thus forming the bearing seat itself. This eliminates the need for intermediary rim elements. Since the scraper roller 50 is pre-tensioned laterally against the coulter disc 1 anyway, the axial securing of the scraper roller bearing is only necessary on one side. 2.5 List of reference symbols 1 coulter disc 2 seed shoes 5 page element 9 seed shoe holder 10 seed tube 20 Direction of travel 21 coulter 26 Soil surface 27 Sowing horizon 40 singulation dispensers 41 shot tube 42 Dosing holding arm 43 Connection profile 44 Tread 45 tire element 46 scraper element 47 Rim element 48 Eccentric bearing axis 49 wiper roller bearings 50 scraper roller 51 scraper roller holder 52 rubber bushing 53 Version of catch roller holder 76 stop beta connection profile inclination gamma rubber bushing preload angle delta scraper roller inclination E_f scraper roller axis eccentricity s wall thickness QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 4275671

[0001] US 5269237 [0001, 0002, 0008] US 6644226

[0001] US 20130319702A1

[0001] US 20070272134A1

[0001] EP 2022307B1

[0001] WO 2020112015A1 [0001, 0015] EP 3340767B1 [0001, 0007] US 4760806

[0001] EP 2982229A1 [0001, 0015]

Claims

[1] Scraper roller (50) on a sowing coulter (21) of an agricultural machine for spreading seed and / or fertilizer, which rolls in a seed slot formed by a furrow-forming tool on the sowing horizon (27), consisting of at least: - a tire element (45), - a scraper roller bearing (49), characterized by that it is positioned laterally against the coulter disc (1) and slides on the coulter disc (1). [2] Scraper roller (50) according to claim 1, characterized by that one or more scraper elements (46) are integrated into the tire element (45). [3] Scraper roller (50) according to claim 1, characterized by that one or more scraper elements (46) are integrated into one or more rim elements (47). [4] Scraper roller (50) according to one of the preceding claims, characterized bythat the cross-section of the tire element (45) is designed such that upon radial compression of the tire element (45) there is a tendency for displacement in the axial direction of at least some of the compressed tire sections. [5] Scraper roller (50) according to one of the preceding claims, characterized by that the cross-sectional profile of the tire element (45) consists, inter alia, of one or more circumferential connecting profiles (43), wherein this section of the cross section is set in its longitudinal direction at an angle to the radial direction about the connecting profile inclination (beta), wherein the different or identical connecting profile inclinations (beta) are between 1° and 90°. [6] Scraper roller (50) according to one of the preceding claims, wherein the connecting profile(s) (43) of the tire element (45) has / have a curved cross-section. [7] Scraper roller (50) according to one of the preceding claims, wherein the wall thickness (s) of the connecting profile(s) (43) of the tire element (45) is not constant in the radial course and / or in the axial course. [8] Scraper roller (50) according to one of the preceding claims, in which the cross-sectional profile of the tire element (45) consists of several connecting profiles (43), characterized by that the connection profile inclinations (beta) of the different connection profiles (43) have a different amount. [9] Scraper roller (50) according to one of the preceding claims, wherein the connecting profile inclinations (beta) of two connecting profiles (43) of the tire element (45) differ only in their sign, characterized by that the cross-sections of the connecting profiles (43) have different wall thickness (s) or different curvatures or both. [10] Scraper roller (50) according to claim 1, wherein the outer and inner circumferential cross-sectional profiles of the tire element (45) are connected to spoke-shaped connecting elements (43), characterized by that the longitudinal direction of this cross-sectional profile or the reference axis of the lowest axial resistance moment is adjusted by the connecting profile inclination (beta) in relation to the axis of rotation of the scraper roller (50). [11] Scraper roller (50) according to claim 1 or 10, wherein the outer and inner circumferential cross-sectional profiles of the tire element (45) are connected by obliquely positioned spoke-shaped connecting elements (43), characterized by that the outer circumferential cross-sectional profile consists of a hollow chamber profile or Z-shaped or similar profile, for example according to the characteristics of claims 5-9. [12] Scraper roller (50) according to one of the preceding claims, characterized bythat its axis of rotation is set obliquely to the axis of rotation of the coulter disc (1) by the scraper roller inclination (delta), or deviates by the scraper roller inclination (delta) from the normal direction of the coulter disc surface at the contact surface. [13] Arrangement of a scraper roller (50) according to claim 1 on a sowing coulter (21), which is guided with a scraper roller holder (51), characterized by that the stripping roller holder (51) represents a rigid or movable connection between the stripping roller (50) and the side element (5) or the seed shoe holder (9). [14] Arrangement of a scraper roller (50) according to claim 1 on a sowing coulter (21), which is guided with a scraper roller holder (51), characterized bythat the scraper roller holder (51) is fastened with one or more rubber elements either to the side element (5) or to the seed shoe holder (9), whereby this rubber mounting can be pre-tensioned both cardanically and in the direction of rotation. [15] Wiper catch roller (50) according to claim 1, wherein the wiper catch roller (50) additionally includes an eccentric bearing axis (48) which represents the connecting element between the wiper catch roller bearing (49) and the wiper catch roller holder (51), characterized by that the positioning on the scraper roller holder (51) has a scraper roller eccentricity (E_f) to the rotational axis of the scraper roller bearing (49).

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