Seed drill

Abstract

The invention relates to a seed drill (10) with several seed coulters (1) arranged side by side, which are connected to a coulter bar (2) rotatable about an axis of rotation (D) in such a way that the coulter pressure of the seed coulters (1) can be adjusted by rotating the coulter bar (2), and with at least one, preferably two, support wheels (3) which are arranged in the direction of travel in front of the seed coulters (1) and by means of which the seed drill (10) is supported against the ground, wherein the support wheels (3) are height-adjustable by rotating the coulter bar (2).

Description

[0001] The invention relates to a seed drill with several seed coulters arranged side by side, which are connected to a coulter beam rotatable about an axis of rotation in such a way that the coulter pressure of the seed coulters can be adjusted by rotating the coulter beam, and with at least one, preferably two, support wheels which are arranged in the direction of travel in front of the seed coulters and by means of which the seed drill is supported against the ground.

[0002] Seed drills can be used to sow seeds in multiple rows side by side in an agricultural field. These seed drills can be pulled across the field by a tractor, thereby distributing the seeds.

[0003] Seed is typically sown using coulters, which not only place the seed on the field but essentially work it into the soil. Before sowing, the soil is gently opened by the coulters, the seed is then placed in the open furrow, and the soil is subsequently closed and, if necessary, slightly compacted. To allow for the placement of multiple seeds in rows side by side, the seed drill is equipped with several coulters arranged adjacent to each other.

[0004] An important parameter in the sowing process is the contact pressure of the seed coulters. With higher contact pressure, the soil is sometimes opened further, and the seed may then be placed at a greater depth than with comparatively lower contact pressure. The soil composition also plays an important role.

[0005] To adjust the seeding pressure, the coulters are mounted on rotating coulter bars. By rotating the coulter bar around an axis of rotation that usually extends transversely to the direction of travel, the seeding pressure of the coulters, and thus also the sowing depth, can be adjusted.

[0006] Since seed drills are often quite large, it is usually necessary to support them against the ground or field using support wheels. It is common practice to position the support wheels in front of the seed coulters in the direction of travel, particularly to the left and right of the tractor. Often, two support wheels are sufficient, as the seed coulters also make contact with the soil and therefore provide some support.

[0007] The support wheels are usually arranged on a machine frame, which is essentially rectangular in shape and serves as the basic supporting structure of the seed drill, and on which the seed coulters can also be arranged, at least indirectly.

[0008] While this design has proven particularly effective in terms of stability, adjusting the height of the support wheels requires additional lifting devices to adjust the position of the seed drill relative to the field. These lifting devices not only increase the weight but also sometimes require a comparatively large amount of installation space.

[0009] Based on this, the invention aims to provide a seed drill which is also supported by height-adjustable support wheels arranged in front of the seed coulters in the direction of travel, but which is characterized by a more compact design.

[0010] This task is solved in a seed drill of the type mentioned above by making the support wheels height-adjustable via a rotation of the coulter bar.

[0011] This design gives the coulter bar(s) a dual function. It serves not only to adjust the seed coulters but also to adjust the support wheels. Therefore, additional lifting devices and drives for adjusting the seed coulter height are unnecessary, resulting in a more compact overall design.

[0012] Furthermore, the functional coupling of the support wheels and seed coulters allows them to be adjusted in height together, thus reducing the control and regulation effort. Alternatively, the seed coulters and support wheels can be adjusted in height independently of each other. This can also be achieved by rotating the coulter beams, for example, using suitable and possibly switchable intermediate elements.

[0013] Regarding the movement of the support wheels, it has proven advantageous for them to be movable back and forth between a working position and a transport position via the coulter bar. In the working position, the support wheels can be in contact with the field and thus perform their supporting function. Various working positions can be provided to adjust the position of the seed drill relative to the field. The support wheels can also have a guiding function in the working position, which is particularly relevant when the support wheels are positioned in front of the seed coulters. In the transport position, the support wheels can be raised off the ground. In this position, the seed drill can also be at least partially folded or arranged in such a way that it is not used for sowing seed but rather for transport, e.g., along a normal road.

[0014] Furthermore, it has proven advantageous to mount the support wheels on the coulter bar. This design allows the coulter bar to serve a dual purpose, as it can support not only the seed coulters but also the support wheels. This design further reduces the required installation space and makes the seed drill even more compact.

[0015] From a design perspective, it has proven advantageous to mount the support wheels to the share beam via a support wheel bracket. The support wheels can be connected to the share beam through the support wheel bracket. The support wheel bracket is advantageously designed such that the support wheels can be moved or pivoted vertically via the support wheel bracket. The support wheel bracket can be designed as a wheel swing arm, connected on one side to the respective support wheel and on the other side to the share beam. The support wheel can be mounted in the support wheel bracket so that it can rotate around its axis of rotation. Each support wheel can be connected to the same share beam via its own support wheel bracket, so that the support wheels can be adjusted vertically together by rotating the share beam.

[0016] With regard to the design of the seed drill, a further advantageous embodiment provides that it has a machine frame and a bearing support connected to the machine frame. The machine frame can be a basic support structure on which the individual components of the seed drill are arranged and which thus functions as a base frame. The machine frame can therefore also be referred to as an assembly frame. The machine frame can have an overall rectangular geometry and include several fixed struts extending parallel to the direction of travel, to which elements can then be attached.

[0017] Between the corresponding struts, shear beams can be arranged so that the struts and shear beams can be arranged alternately one behind the other in the direction of travel. The struts and shear beams can extend parallel to each other transversely to the direction of travel. The bearing holder can be non-rotatably connected to the machine frame or to the struts. For fastening, U-shaped mounting brackets can be provided, in particular, which grip the machine frame or the struts and are connected to the bearing holder at their ends. Thus, the bearing holder can be connected to the underside of the machine frame or the struts. Furthermore, the bearing holder can also be connected to the shear beam. Specifically, the shear beam can extend through the bearing holder, so that the bearing holder can essentially be arranged on the shear beam and the machine frame, in particular suspended from it.The bearing support can have, in particular, webs extending in the direction of travel, which connect the struts of the machine frame with the respective share beam.

[0018] According to a further advantageous embodiment, it is proposed that the bearing holder has two bearing holder elements arranged at a distance from each other. The two bearing holder elements can be designed as identical parts and each be connected to the machine frame or a strut of the machine frame and a support beam. The distance between the two bearing holder elements can essentially correspond to the width of the support wheel, which is arranged on the support wheel bracket connected to the bearing holder. Due to the two bearing holder elements, the bearing holder exhibits comparatively high mechanical stability, which ensures reliable operation and movement of the support wheels.

[0019] According to an advantageous embodiment of the invention, a limiting device is provided to restrict the movement of the support wheel. This limiting movement restricts the movement of the support wheel between the working position(s) and the transport position. Movement into an undesired range can thus be prevented. The limiting device can also serve a guiding function, ensuring reliable movement of the support wheel bracket or the support wheel itself.

[0020] Regarding the design of the limiting device, it is further proposed that the limiting device has a stop lever which is pivotally mounted to the bearing holder on one side and has a guide on the other side in which a guide pin is arranged. During movement between the working and transport positions, the guide pin can move back and forth within the guide. The guide pin can be part of the support wheel bracket and thus move together with the respective support wheel. The guide pin can protrude laterally from the support wheel bracket and extend into the guide. The guide is advantageously designed as an elongated slot in which the guide pin can slide back and forth when the support wheel bracket moves.

[0021] The stop lever can have an elongated geometry and pivot around its pivot point on the bearing holder when the support wheel or bearing bracket moves. Advantageously, the stop lever is arranged on one of the two bearing bracket elements. A symmetrical design is not necessarily required; the arrangement of a stop lever on only one bearing bracket element may be sufficient to limit the movement of the support wheel bracket.

[0022] With regard to the stop lever, it has proven advantageous for it to be movable between a release position, in which the support wheel can be moved back and forth between the working and transport positions, and a locking position, in which movement of the support wheel is prevented. In the locking position, no movement of the support wheel is possible. In this respect, the stop lever can also function as a lock, securing the support wheel in the working position. In the release position, however, the support wheel bracket can be moved. The stop lever can pivot back and forth between the locking and release positions about its pivot point on the stop lever.

[0023] According to a further development of the invention, the two ends of the guide are designed as stops, with the guide pin bearing against one stop in the transport position and against the other stop in the working position. These stops prevent further movement of the support wheels. One stop can be assigned to the transport position and the other to the working position.

[0024] According to a particularly preferred embodiment of the invention, the guide has an angled section in the area of ​​a stop, particularly in the area of ​​the stop associated with the working position, with the guide pin being arranged in the angled section in the locking position. When the guide pin is in the angled section, movement of the support wheel is no longer possible. Rather, the guide pin is positively locked in the angled section and thus no longer movable. Advantageously, the angle is set at a 90-degree angle relative to the guide. When the support wheel or the support wheel bracket is moved such that the guide pin slides in the guide in the direction of the angled section, it can automatically engage in the angled section upon reaching it. When the guide pin reaches the angled section, the stop lever can be pivoted around the bearing holder by gravity and thus purely passively.This moves the angled section over the guide pin, so that the guide pin and the angled section then lock together. Reverse movement is then no longer possible. Forces acting on the support wheel are then transferred via the guide pin to the stop lever and from there into the machine frame.

[0025] To move a locked support wheel, the stop lever can be moved from the locked position to the unlocked position via a release lever. When the stop lever is pivoted back into the unlocked position, particularly against gravity, the guide pin is again in the guide, thus allowing movement of the stop lever and therefore the support wheel. The release lever can thus actively move the stop lever in one direction, transferring it from the locked position to the unlocked position. This releases the angled section from the bearing pin. The release lever can rotate the stop lever around the pivot point on the bearing bracket.

[0026] With regard to the release lever, it has proven advantageous for it to be rotatably mounted around the axis of rotation. This design has proven particularly advantageous in that an additional drive is not necessarily required to operate or move the release lever. It can be provided that the release lever is moved by a rotation of the shear bar, so that the transition of the stop lever from the locked position to the release position is coupled to the rotation of the shear bar. However, it is also possible to provide that the release lever can be moved independently of a rotation of the shear bar via an external drive.

[0027] According to a further advantageous embodiment of the invention, the support wheel bracket has at least one insertion opening for inserting a plug-in stop, wherein the plug-in stop limits the movement of the support wheel bracket relative to the plug-in stop. Although the guide of the stop lever already includes two stops, an additional stop can be provided via the plug-in stop, which can limit the movement of the support wheel bracket. In this respect, the movement of the support wheel bracket can be limited by this stop at least in one direction, specifically before the guide pin reaches the corresponding end of the guide. It can be provided that the plug-in stop protrudes laterally from the support wheel bracket and then abuts the stop lever in a specific position, thus preventing further movement. The plug-in stop can be inserted manually into a corresponding insertion opening.

[0028] From a design perspective, the plug-in stop can have a handling area that allows it to be gripped by hand. Furthermore, the plug-in stop can have a stop head. The stop head can, in turn, have one or more stop surfaces against which the stop lever can strike when the support wheel bracket is moved. The plug-in stop can also have an insertion section through which it can be inserted into the insertion opening. This insertion section can have a pin-shaped geometry. When the plug-in stop is positioned accordingly, the stop head can protrude laterally from the support wheel bracket, so that it, or rather the stop surface facing the stop lever, can limit the movement of the support wheel bracket. The insertion opening can be rectangular or polygonal, so that the inserted plug-in stop is fixed in the insertion opening and cannot rotate.

[0029] To define multiple stop positions using the plug-in stop, it has proven advantageous for the support wheel bracket to have several insertion openings, allowing the plug-in stop to be selectively inserted into any one of these openings. The different insertion openings change the position of the inserted plug-in stop, thus resulting in different stop positions. Preferably, two adjacent insertion openings are provided, which can be selected arbitrarily. In particular, the support wheel can be adjusted in its working position via the different stop positions. Each stop position can therefore be assigned a specific working position.

[0030] According to an advantageous further development of the plug-in stop, it has proven beneficial for it to be designed as an eccentric plug-in stop that defines different stops depending on its orientation. The eccentric stop is characterized by the fact that it defines a different stop depending on how it is inserted into the insertion opening. The stop head can thus be arranged eccentrically to the insertion section, so that a rotation of the plug-in stop defines different stops. The stop head can be block-shaped and, in particular, have four stop surfaces, each of which can have a slightly different distance to the insertion opening or the insertion section. In the case of four different stop surfaces and two different insertion openings, a total of eight different stops can thus be provided.If one also considers the possibility of not using a plug stop, up to nine different working positions can be defined.

[0031] According to an advantageous embodiment of the invention, two levers pivotally connected to each other are provided, one of which is pivotally mounted to the support wheel bracket and the other pivotally mounted to the bearing holder. When the support wheel bracket moves, the two levers can also move relative to each other; that is, the angle of the levers can change when the support wheel bracket moves. The two levers can each be pivotally connected to each other at one end, and at the opposite end, one lever can be pivotally connected to the support wheel bracket and the other to the bearing holder. Due to the coupling with the levers, the movement of the support wheel bracket can be limited by locking the levers or by limiting their movement. Thus, it is possible to lock or limit the movement of the support wheel bracket.A locking device for the support wheel bracket should be provided to lock the levers. The support wheel bracket can thus be locked via the two levers, particularly in the working position. The two levers, together with the web of the bearing holder connecting the strut to the share beam and the support wheel bracket, can form a parallelogram linkage.

[0032] Furthermore, it has proven advantageous if the two levers are movable via a release lever. Since the two levers are positively coupled, moving either lever is sufficient to move both and thus also the support wheel bracket. It can be provided that one of the two levers, in particular the lever connected to the bearing holder, has a guide pin that projects laterally and can interact with the release lever. Specifically, when moved, the release lever can pivot the lever via the guide pin, thereby also changing the position of the support wheel bracket. The lever can thus be pivoted about its pivot point on the bearing holder by the release lever. It is possible for the release lever to be moved by a rotational movement of the support beam. For this purpose, the release lever can be rotationally coupled to the support beam, particularly at its end.However, it is also possible that the release lever acts as a stop, limiting the movement of the lever when the guide pin comes into contact with the release lever.

[0033] Further details and advantages of the invention will be explained in more detail below with reference to the accompanying schematic drawings. These show: Fig. 1 a seed drill with a front carriage and a rear unit having several seed coulters arranged side by side; Fig. 2 a perspective view of a leading support wheel for supporting the rear unit; Fig. 3 an exploded view of the elements supporting the support wheel; Fig. 4 a perspective view of a support wheel in a transport position; Fig. 5a, Fig. 5b Perspective detail views of the support wheel and a stop lever in a release position and in a locking position including enlarged detail views; Fig. 6a, Fig. 6b further views of the release position and the blocking position according to the Fig. 5a, Fig. 5b; Fig. 7a, Fig. 7b Views of the support wheel in the transport and working positions with two levers connecting the support wheel bracket to the bearing holder; Fig. 8 a detailed view of a plug stop for limiting the movement of the support wheel; Fig. 9a, Fig. 9b Further views of the transport position and the release position according to the Fig. 7a, Fig. 7b.

[0034] The presentation of Fig. Figure 1 shows a seed drill 10 comprising a front carriage 10.1 and a rear unit 10.2 connected to the front carriage 10.1 at the rear. The front carriage 10.1 is equipped with a seed hopper in which the seed to be sown in an agricultural field is stored. The front carriage 10.1 is connected at its front end to a [unclear - possibly a reference to a specific component or component] shown in the illustration of the Fig. 1. A tractor (not shown) is attached, which can be used to move the entire seed drill across the field for spreading the seed.

[0035] The rear unit 10.2 is significantly wider than the front unit 10.1 and features several seed coulters 1 arranged side by side, through which the seed can be applied to the field. With each pass over the field, seed can thus be applied to a strip of the field, with the corresponding strip being approximately as wide as the rear unit 10.2.

[0036] The rear unit 10.2 has a substantially rectangular geometry in a top view, based on a correspondingly rectangular machine frame 9. The machine frame 9 has several struts extending transversely to the direction of travel and coulter beams 2 arranged parallel to the struts, on each of which several seed coulters 1 are arranged side by side. The coulter beams 2 are rotatably mounted on the machine frame 9 and can rotate about a pivot axis D extending longitudinally along the coulter beams 2. The pivot axis D is, for example, shown in the illustration of the Fig. 2. The seed coulters 1 connected to the respective seed coulter 2 can be adjusted in height by means of a rotational movement of the share beam 2.

[0037] In order to support the rear unit 10.2 and thus also the seed drill 10 as a whole against the ground or the agricultural field, the rear unit 10.2 in the embodiment shown in the Fig. 1 two leading support wheels 3, with one support wheel 3 arranged on the left and one on the right of the front carriage 10.1.

[0038] Due to the relatively large width of the rear unit 10.2, the two sections projecting laterally from the front carriage 10.1 can be folded up, thus reducing the overall width of the seed drill 10. This is important, for example, for road transport, as the seed drill 10, in its unfolded position, generally exceeds the maximum permissible dimensions. When the rear unit 10.2 is folded up accordingly, the seed coulters 1 must be retracted or raised, as otherwise they would increase the width in the raised position. The same applies to the support wheels 3, which can be moved between a working position A, in which they are extended downwards towards the field and support the seed drill 10 against the field, and a transport position T, in which the support wheels 3 are pivoted upwards and thus retracted.

[0039] The following section describes the design, mounting, and adjustment of a support wheel 3. These descriptions also apply accordingly to the other support wheels 3.

[0040] According to the presentation of Fig. Figure 3, which shows an exploded view of the elements supporting the support wheel 3, initially provides a support wheel bracket 4 in which the support wheel 3 is rotatably mounted. The support wheel bracket 4 has two parallel cheeks between which the support wheel 3 is rotatably arranged so that it can roll on the field.

[0041] In the end region of the support wheel bracket 4 opposite the support wheel 3, it is angled upwards and connected at its end to a coulter beam 2. The support wheel 3 can be mounted on the coulter beam 2 via the support wheel bracket 4. The coulter beam 2 thus has a dual function, serving not only to support the seed coulters 1 but also the support wheel 3.

[0042] Further to the right in the representation of the Fig. 3 A bearing holder 6 can be seen, which is attached to a strut of the machine frame 9 via the two U-shaped mounting brackets 9.1. At the other end, the corresponding bearing holder 6 is connected via the bracket shown in the illustration. Fig. The bearing bracket 6 is supported by three visible eyes on the shear beam 2, which can rotate relative to the bearing holder 6. This means that the bearing holder 6 is stationary and does not move with the rotation of the shear beam 2. The section of the bearing holder 6 located between the bearing brackets and the eyes, and extending essentially horizontally, is also referred to as the web. Furthermore, the bearing holder 6 consists of two bearing holder elements 6.1 and 6.2, which are identical and arranged parallel to each other, as shown in the illustration. Fig. 3 is still recognizable.

[0043] To move the support wheel 3 back and forth between the transport position T and the working position A, the support wheel bracket 4 must be pivoted upwards about the axis of rotation D. The support wheel bracket 4 is thus pivotally mounted about the same axis of rotation D as the share beam 2.

[0044] The support wheel 3, or rather the support wheel bracket 4, can now be moved in various ways. In one embodiment, the support wheel bracket 4 is rotaryally coupled to the coulter beam 2, so that by rotating the coulter beam 2, not only the seed coulters 1 but also the support wheel 3 can be raised and lowered. The support wheel bracket 4 also rotates around the axis of rotation D, which acts like a lever by which the height of the support wheel 3 is adjusted. Since, in this embodiment, the rotation of the coulter beam 2 is responsible for adjusting the support wheel 3, no additional drive is required to move the support wheel 3.

[0045] In an alternative design, which is also reflected, for example, in the representation of the Fig. As shown in Figure 3, the support wheel bracket 4 is rotatably connected to the coulter beam 2. This means that the support wheel bracket 4 and the coulter beam 2 are rotationally decoupled from each other, and a rotational movement of the coulter beam 2 to adjust the seed coulters 1 does not result in a movement of the support wheel 3. For the rotationally decoupled mounting of the support wheel bracket 4 on the coulter beam 2, the support wheel bracket 4 has a pivot bearing 8, or rather, each of the two sides of the support wheel bracket 4 has a pivot bearing 8. The pivot bearing 8 allows the support wheel bracket 4 to be supported on the coulter beam 2, while simultaneously providing rotational decoupling.

[0046] In this embodiment, a drive is provided for moving the support wheel console 4. The drive is designed as a lifting device 5 and is shown in the illustration of the Fig. Figure 3 shows the lifting device 5 in the form of a hydraulic cylinder. The lifting device 5 is pivotally connected at one end to the bearing holder 6 or the bearing holder element 6.2, and at the opposite end to the support wheel bracket 4. This connection allows the support wheel bracket 4 to pivot clockwise when the lifting device 5 is extended, lifting the support wheel 3 from the working position A to the transport position T. Conversely, when the lifting device 5 is retracted, the support wheel bracket 4 pivots counterclockwise, moving the support wheel 3 downwards from the transport position T to the working position A.

[0047] To limit the movement of the support wheel console 4, a limiting device 7 is provided, which is shown in the illustration. Fig. 3 has a stop lever 7.1 which is pivotably mounted on the other bearing support element 6.1, essentially parallel to the lifting device 5. In the end region facing the support wheel bracket 4, the stop lever 7.1 has a guide 7.11 in the form of an elongated hole in which a guide pin 4.1, arranged on the support wheel bracket 4 and projecting laterally, is guided. When the support wheel bracket 4 pivots, the guide pin 4.1 moves back and forth in the elongated hole or in the guide 7.11, and the length of the guide 7.11 limits the movement of the support wheel bracket 4. That is, in the transport position T, the guide pin 4.1 rests against one end of the guide 7.11, and in the working position A, it rests against the other end of the guide 7.11.

[0048] The presentation of Fig. Figure 4 shows the limiting device 7 and the guide pin 4.1 guided in the guide 7.11 in the working position. This means that the support wheel 3 is lowered to its maximum extent, and further lowering is prevented by the contact of the guide pin 4.1 with the upper end of the guide 7.11. The two ends of the guide thus act as stops 7.12, 7.13, which are also shown in the enlarged view of the Fig. 5a and Fig. 5b can be seen.

[0049] Furthermore, the presentation of Fig. 4 two insertion openings 4.2 can be seen, into which a plug stop 4.3 can optionally be inserted, which is shown in the illustration of the Fig. 3, but also in an enlarged view in the representation of the Fig. 8 can be seen. Since according to Fig. If no plug stop 4.3 is inserted, it is possible for the guide pin 4.1 to move along the entire length of the guide 7.11. This movement can be limited by a plug stop 4.3. In the illustration of the Fig. Figure 8 shows, for example, that the plug stop 4.3 already abuts the outside of the stop lever 7.1 before the guide pin 4.1 has reached the end of the guide 7.11. Thus, different working positions A can be achieved via the plug stop 4.3, or the support wheel 3 can be lowered to different degrees.

[0050] To define different working positions A or different positions of the support wheel console 4, the plug-in stop 4.3 can now be selectively inserted into one of the two spaced-apart insertion openings 4.2. This allows two different working positions A to be defined.

[0051] The design of the plug stop 4.3 is shown in the illustration of the Fig. 8. This consists essentially of a rod-shaped insertion section 4.33, which can be inserted into the plug-in stop 4.3, and a stop head 4.32 which has a larger diameter than the plug-in stop 4.3 and thus, in the inserted position, protrudes laterally from the support wheel bracket 4 or the cheek of the support wheel bracket 4. The stop head 4.32 is block-shaped and has four stop surfaces 4.31 which, depending on the orientation of the stop head 4.32, can abut the outside of the stop lever 7.1 to limit movement.

[0052] As can be seen from the presentation of the Fig. As can be seen in Figure 8, the stop head 4.32 is arranged eccentrically to the insertion section 4.33. This results in different stop surfaces 4.31 facing the stop lever 7.1 depending on the orientation of the insertion stop 4.3, i.e., its orientation when inserted into the insertion opening 4.2. Furthermore, the distance of the facing stop surface 4.31 changes depending on the orientation due to the eccentric arrangement of the stop head 4.32. In the illustration of the Fig. Figure 8 shows that the plug-in stop is marked with the numbers 1 to 4. This symbolizes that the plug-in stop 4.3 can be rotated by 90 degrees, which then changes the stop position and thus also the working position A. With four different positions per insertion opening 4.2, this results in a total of eight different stop positions plus one stop position without plug-in stop 4.3. Significantly more stop positions can be defined if the plug-in stop 4.3 can be inserted into the plug-in stop 4.3 in increments other than 90 degrees. The illustration of the Fig. Figure 8 shows that the insertion openings 4.2 have a star-shaped geometry, which allows for an even more incremental rotational movement and thus even more stop positions.

[0053] The design according to Fig. 5a, Fig. Figures 5b, 6a, and 6b essentially show the limiting device 7 according to Fig. 4, however, the guide 7.11 has an angle 7.14 at one end. This angle 7.14 reliably secures the support wheel bracket 4 in the working position A, preventing the support wheel 3 from shifting even when driving on uneven ground. Furthermore, this ensures that the drive remains largely free of force, regardless of whether the movement is achieved by rotating the support beam 3 or using a lifting device 5.

[0054] When the support wheel bracket 4 is moved from the transport position T, in which the guide pin 4.1 initially rests against the front stop 7.12 associated with transport position T, to the working position A, the guide pin 4.1 slides rearward in the guide 7.11 toward the stop 7.13. Once the support wheel bracket 4 has pivoted into the working position A, the stop lever 7.1 moves downwards, causing the guide pin 4.1 to engage in the angled recess 7.14. This results in an automatic locking mechanism, and it is then no longer possible to move the support wheel bracket 4 back in this position. The corresponding position of the stop lever 7.1 with the guide pin 4.1 locked in place is therefore also referred to as the locking position S.

[0055] To move the support wheel bracket 4 back into the transport position T, the stop lever 7.1 must be lifted from the locked position S and moved into the release position F, in which the guide pin 4.1 can slide back and forth in the guide 7.11. An external drive can be provided to lift the stop lever 7.1 or to move it from the locked position S to the release position F. However, it can also be provided that the stop lever 7.1 is lifted via the release lever 7.2. The release lever 7.1 can be mounted on the saw beam 2 so that it can be moved by rotating the saw beam 2. To interact with the stop lever 7.1, it has a laterally projecting guide pin 7.4, which is located between the pivot point of the stop lever 7.1 on the bearing holder 6 and the guide 7.11. The release lever 7.2 can then move the guide pin 7.1 during a rotational movement.Moving the support wheel bracket 4 upwards causes the stop lever 7.1 to rotate slightly. This lifts the stop lever 7.1, or rather the angled section 7.14, away from the guide pin 4.1, allowing it to move again within the guide 7.11. Moving the support wheel bracket 4 into the transport position T then causes the guide pin 7.4 to slide within the guide 7.11 towards the stop 7.12. This final position is shown in the illustration. Fig. 6a can be identified.

[0056] The illustrations of the Fig. 7a, Fig. 7b as well as the Fig. 9a, Fig. 9b. Regarding the basic design and mounting of the support wheel bracket 4, reference is made to the above. The essential difference to the embodiment described above lies in the design of the limiting device 7. The limiting device 7 has two levers 7.31, 7.32, which are pivotally connected to each other at one end. Lever 7.32 is connected at the other end to the support wheel bracket 4, and lever 7.31 is connected at the other end to the bearing holder 6. Thus, the two levers 7.32, 7.31, the web of the bearing holder 6, and the support wheel bracket 4, or rather the angled part of the support wheel bracket 4, form a parallelogram linkage.

[0057] The representations of Fig. 7a and Fig. Figure 9b shows the transport position T, in which the support wheel bracket 4 is pivoted upwards. In this position, the angle between the two levers 7.31, 7.32 is very large, approximately 180 degrees. In the lowered working position A, which is shown in the illustrations of the Fig. 7b and the Fig. As can be seen in 9a, the angle is significantly smaller and in the position shown it is approximately 100 degrees.

[0058] It may be provided that the support wheel bracket 4 can be moved back and forth between the transport position T and the working position A in the manner described above, for example by rotating the guide bar 2 or by means of a lifting device 5. The two levers 7.31, 7.32 can serve a guiding function in this process. Furthermore, the two levers 7.31, 7.32 can also limit the movement of the support wheel bracket 4. For this purpose, the movement of the levers 7.31, 7.32 can be limited, for example, by corresponding stops, which are shown in the illustration. Fig. 7a, Fig. 7b are not shown, they will be limited.

[0059] Furthermore, the two levers 7.31 and 7.32 can also be used for actuation. The rear lever 7.31 can have a laterally projecting guide pin 7.4, allowing it to be moved via the release lever 7.2, which is rotatably mounted about the pivot axis D. Due to the coupling of the two levers 7.31 and 7.32 with the support wheel bracket 4, the movement of lever 7.31 can then also move the support wheel bracket 4. However, the interaction of the guide pin 7.4 and the release lever 7.2 can also limit the movement of the second lever 7.31 and thus also the movement of the support wheel bracket 4.

[0060] Overall, the construction described above allows the support wheel 3 to be lifted in a relatively simple manner while ensuring a compact design. Reference symbol: 1 sowing clump 2 shear beams 3 Support wheel 4 Support wheel console 4.1 Guide pins 4.2 Insertion opening 4.3 Plug stop 4.31 Stop surface 4.32 Stop head 4.33 Insertion section 5 Lifting device 6 bearing holders 6.1 Bearing holder element 6.2 Bearing holder element 7 Limiting device 7.1 Stop lever 7.11 Leadership 7.12 Attack 7.13 Attack 7.14 Angle 7.2 Release lever 7.31 Lever 7.32 Lever 7.4 Guide pins 8 swivel bearings 9 machine frames 9.1 Mounting bracket 10 Seed drill 10.1 Front end 10.2 Rear unit F Release position S Locking position A working position T Transport position D axis of rotation

Claims

Seed drill with several seed coulters (1) arranged side by side, which are connected to a coulter bar (2) rotatable about an axis of rotation (D) in such a way that the coulter pressure of the seed coulters (1) can be adjusted by rotating the coulter bar (2), and with at least one, preferably two, support wheels (3) which are arranged in the direction of travel in front of the seed coulters (1) and by means of which the seed drill (10) is supported against the ground, characterized in that the support wheels (3) are height-adjustable by rotating the coulter bar (2). Device according to claim 1, characterized in that the support wheels (3) are movable back and forth over the share beam (2) between a working position (A) and a transport position (T). Device according to one of claims 1 or 2, characterized in that the support wheels (3) are mounted on the share beam (2). Device according to claim 3, characterized in that the support wheels (3) are mounted on the shear beam (2) via a support wheel console (4). Device according to one of the preceding claims, characterized by a limiting device (7) for limiting the movement of the support wheel (3). Device according to claim 5, characterized in that the limiting device (7) has a stop lever (7.1) which is pivotably connected to the bearing holder (6) on one side and which has a guide (7.11) on the other side in which a guide pin (4.1) is arranged. Device according to claim 6, characterized in that the stop lever (7.1) is movable between a release position (F) in which the support wheel (3) can be moved back and forth between the working position (A) and the transport position (T), and a locking position (S) in which movement of the support wheel (3) is blocked. Device according to one of claims 6 or 7, characterized in that the two ends of the guide (7.11) are designed as stops (7.12, 7.13), wherein the guide pin (4.1) rests against one stop (7.12) in the transport position (T) and against the other stop (7.13) in the working position (A). Device according to claim 8, characterized in that the guide (7.11) has an angle (7.14) in the area of ​​a stop (7.12, 7.13), in particular in the area of ​​the stop (7.12) associated with the working position (A), wherein the guide pin (4.1) is arranged in the angle (7.14) in the locking position (S). Device according to one of claims 6 to 9, characterized in that the stop lever (7.1) can be moved from the locked position (S) to the release position (F) via a release lever (7.2). Device according to claim 10, characterized in that the release lever (7.2) is rotatably mounted about the axis of rotation (D). Device according to one of claims 4 to 11, characterized in that the support wheel console (4) has at least one insertion opening (4.2) for inserting a plug stop (4.3), wherein the plug stop (4.3) limits a movement of the support wheel console (4) relative to the plug stop (4.3). Device according to claim 12, characterized in that the support wheel console (4) has several insertion openings (4.2), wherein the insertion stop (4.3) can be selectively inserted into one of the insertion openings (4.2). Device according to one of claims 4 to 13, characterized by two levers (7.31, 7.32) pivotably connected to each other, wherein one of the levers (7.31) is pivotably attached to the support wheel console (4) and the other lever (7.32) is pivotally attached to the bearing holder (6). Device according to claim 14, characterized in that the two levers (7.31, 7.32) are movable via a release lever (7.2).

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