Haymaking machine and method for producing a side swath or a central swath

Abstract

The invention relates to a haymaking machine (1), in particular a swather, with two rake rotors (2a, 2b) and to a method for producing a side swath or a central swath, wherein the rake rotors each comprise: a rotor housing (3), a plurality of tine arms (4) rotating around a rotor axis (A) and mounted in a respective arm bearing (7) with a tine package section (5), and a curved track (6) in the rotor housing (3), via which a pivoting angle of the respective tine arm can be controlled as a function of the rotating position of the tine arm (4), wherein the direction of rotation of the rear rake rotor, viewed in the direction of travel (F), around the rotor axis (A) is reversible without mechanical retooling.

Description

[0001] The invention relates to a haymaking machine, in particular a swather, with two rake rotors, and to a method for producing a side swath or a central swath according to the preambles of claims 1 and 15.

[0002] Haymaking machines with two rake rotors are already known from the state of the art.

[0003] Common commercially available haymaking machines that produce a side swath have rake rotors that rotate in the same direction. However, such haymaking machines cannot form a central swath with both rotors. However, crop collection devices such as balers, forage harvesters, and loader wagons prefer a central swath.

[0004] EP 0 559 024 A1 already discloses a haymaking machine for generating a central swath, comprising two rotary rakes arranged at the same height on opposite sides of a drawbar. In this haymaking machine, the angular position of a drawbar relative to the direction of travel must be adjusted in a complicated manner to generate a side swath. It is possible to reverse the rotation direction of a rotary rake to generate a central swath. However, this is only possible by completely rebuilding the machine when changing the direction of rotation. Thus, cam discs and the entire tine carrier set with the corresponding tine packages must be converted for the changed direction of rotation. For this reason, this concept has not been able to gain market acceptance.

[0005] Based on this, the present invention is based on the object of providing a haymaking machine and a corresponding method that allows a simple change from side swath to center swath deposition.

[0006] According to the invention, this object is achieved by the features of claims 1 and 15.

[0007] According to the invention, the haymaking machine, in particular a swather, has two rake rotors. The rake rotors each comprise a rotor housing, a plurality of tine arms rotating around a rotor axis and mounted in a respective arm bearing, each tine arm having a tine stack section, and a cam track in the rotor housing. The cam track allows a pivot angle of the respective tine arm about a longitudinal axis L to be controlled depending on the rotational position of the tine arm.

[0008] According to the invention, the direction of rotation of the rear rake rotor (viewed in the direction of travel) around the rotor axis can be reversed without mechanical retooling. "Rear rake rotor" means that the rotor axes are arranged one behind the other in the direction of travel and on different sides relative to the central longitudinal axis, in particular, for example, the drawbar. The orbits of the tine packs of the two rake rotors do not overlap during central swath placement.

[0009] By arranging the rake rotors one behind the other, it is possible to create a side swath when both rake rotors rotate in the same direction, even if, for example, the drawbar extends in the direction of travel. If the direction of rotation of the rear rake rotor is reversed, it is possible to easily and reliably switch from a side swath to a center swath, effectively conveying the crop, such as hay, from the outside to the center by the front rake rotor and then from the outside to the center by the rear rake rotor, even if the drawbar extends in the direction of travel.

[0010] In this way, the direction of rotation of the rear rake rotor can be reversed in a simple and reliable manner, for example from the tractor cab, in order to then create a central swath.

[0011] Without mechanical conversion means without replacing or modifying the tine packs and the cam track.

[0012] According to a preferred embodiment, the tine packs are arranged essentially radially, meaning that the center axis of the tine pack section of the rear rake rotor extends essentially radially from the rotor axis. This allows for precise operation in opposite directions of rotation.

[0013] In this application, an essentially radial arrangement of the tine pack section also means alignments of the central axis of the tine pack section that deviate slightly from a precisely radial arrangement. This means, for example, that for the respective rear rake rotor, the center offset of the central axis of the tine pack section to the rotor axis is <100 mm. The extended center axis, i.e. a straight line on which the center axis of the tine pack section lies, is taken into account. The center offset is the distance of the rotor axis to the center axis, i.e. the perpendicular of the rotor axis to the center axis. This center offset is acceptable for proper function, for example, with tine rotor diameters >=3 m.

[0014] The angle γ between the central axis of the tine package section and a straight line extending radially from the rotor axis to the outer end of each tine arm is preferably less than 6°, in particular less than 4°.

[0015] With this design, the respective rear rake rotors are suitable for both directions, which would not be possible with the tangential arrangement of the tine sets known from the prior art. The respective tine set is thus always correctly aligned, regardless of the direction of rotation.

[0016] As previously described, it is important that at least the tine stack section extends substantially radially. It is possible that the arm bearing is already aligned substantially radially for this purpose.

[0017] According to a further embodiment, the center offset of the center axis M of the arm bearing to the rotor axis can be less than 150 mm, in particular less than 100 mm. Preferably, the angle Y between the center axis M of the arm bearing and a straight line extending radially from the rotor axis to the outer end of the tine arm is less than 6°, in particular less than 4°.

[0018] If the arm bearing is already designed such that the center offset is less than 100 mm or the angle γ is less than 4°, the tine arms can also be essentially straight. If the center offset or the angle Y is somewhat larger, the tine arm can be bent accordingly so that at least the tine stack section has a center offset of <100 mm and the angle Y is less than 4°. In any case, however, the center offset of the arm bearing should be less than 150 mm and the angle Y less than 6° in order to still be able to align the tine stack section precisely.

[0019] According to a further preferred embodiment, which further promotes the creation of the central swath, the curved path of the rear rake rotor is symmetrical to an axis of symmetry S, at least in one working area, i.e., at least in one partial area, i.e., partial angle range (partial angle range of 360°) of the rake rotor, with the axis of symmetry preferably extending in the direction of travel. This ensures that even when the direction of rotation is reversed, the tine pack sections are rotated by the same angle α around their longitudinal axis.

[0020] The working area of ​​the rake gyroscope is preferably located on the front side of the rear rake gyroscope, as viewed in the direction of travel. The working area extends, for example, from the axis of symmetry S in both directions over an angular range of 50° to 75°.

[0021] It is particularly advantageous if the cam track is rotatable around the rotor axis A, in particular at least up to + / -30°. This allows the working area to be pivoted along with the axis of symmetry in relation to the direction of travel to adapt the process to different conditions, such as heavy feed masses.

[0022] According to a preferred embodiment, the rake tines of the tine assembly of a tine arm extending along the axis of symmetry extend vertically downward. The rake tines are preferably straight. The rake tines are therefore not curved to one side, so they can be used equally well in both directions of rotation.

[0023] Advantageously, the haymaking machine has a switching device for reversing the direction of rotation of the rear rake rotor. This switching device can preferably be operated via an actuating device from the tractor cab.

[0024] According to a preferred embodiment, the switching device comprises a drive for the rear rake rotor, wherein the direction of rotation of the rake rotor is preferably reversible via this drive. Such a drive can be operated, for example, via a remote control or via an actuating device from the tractor cab.

[0025] The drive is preferably designed as a hydraulic motor. Such a motor is inexpensive and easy to implement. Alternatively, an electric motor, for example, can be used.

[0026] According to one embodiment, the hydraulic motor can be designed as a superimposed drive for the rear rake rotor. The rear rake rotor can be driven in a first direction of rotation via a cardan shaft and in a second, opposite direction of rotation with a freewheel in the drive train via the hydraulic motor. The hydraulic motor is driven, in particular, by the tractor's hydraulic system. The front rake rotor can be driven exclusively via a tractor-driven cardan shaft.

[0027] According to a further embodiment, the rear rake rotor can be driven by the hydraulic motor in a first direction of rotation and in an opposite second direction of rotation. The other rake rotor can then be driven either by its own hydraulic motor or via a cardan shaft. The hydraulic motor(s) can then be driven by the tractor's hydraulics. To increase performance, at least the hydraulic motor for the rear rake rotor can be attached to the rotor gearbox of the rear rake rotor, and a hydraulic pump can be provided that is driven by the tractor's PTO. The hydraulic pump can be mounted behind the center gearbox and driven by the tractor's PTO, and the direction of rotation of the rear rake rotor can be controlled via a directional control valve.

[0028] However, it is also possible for both rake rotors to be driven in a first direction of rotation via a mechanical drive, in particular a cardan shaft, and for the switching device to have a reversing gear such that the rear rake rotor can be driven in a second direction of rotation opposite to the first direction of rotation.

[0029] According to the method according to the invention for producing a side swath or a center swath, both rake rotors are driven in a first direction of rotation to produce a side swath and the front rake rotor is driven in a first direction of rotation to produce a center swath and the direction of rotation of the rear rake rotor is switched to a second opposite direction of rotation without converting the rake tines and cam track.

[0030] According to a preferred embodiment, the same rake tines and the same curved path of the rear rake rotor are used for both directions of rotation and the switching is preferably carried out by actuating an actuating device, in particular from the tractor cab, ie without retooling.

[0031] The front calculating gyroscope can be designed like a conventional calculating gyroscope or like the rear calculating gyroscope.

[0032] The invention is explained in more detail below with reference to the following figures. Fig. 1 shows a plan view of a haymaking machine according to an embodiment of the present invention. Fig. 2 shows a haymaking machine in perspective view according to an embodiment of the present invention. Fig. 3 shows a perspective exploded view of part of the rotor. Fig. 4 shows a plan view of a first embodiment with radially extending tine arms. Fig. Figure 5 shows a plan view of another embodiment according to the present invention, which is essentially the same as in Fig. 4 shown embodiment. Fig. 6 shows in perspective the Fig. 5 shown embodiment. Fig. 7 shows that in Fig. 6 shown embodiment in side view. Fig. 8 shows an embodiment according to another embodiment of the present invention. Fig. 9a shows a perspective external view of a rotor housing according to an embodiment of the present invention. Fig. 9b shows a longitudinal section through a rotor housing according to an embodiment of the present invention Fig. 10a schematically shows a working area according to the present invention. Fig. 10b shows a pivoted work area according to the present invention Fig. 11 shows a perspective schematic representation of an embodiment with a superposition drive according to the present invention. Fig. 12 schematically shows another embodiment with a hydraulic motor according to an embodiment of the present invention. Fig. 13 schematically shows another embodiment according to the present invention with two hydraulic motors. Fig. 14a shows a roughly schematic view of a reversing gear in a first direction of rotation according to the present invention. Fig. 14b shows a rough schematic of the reversing gear from Fig. 14a in a second direction of rotation according to the present invention.

[0033] Fig. 1 and Fig. Figure 2 shows a haymaking machine 1 in the form of a swather with two rake rotors 2a, 2b. The rake rotors 2a, 2b are attached to a drawbar 12 or a frame via corresponding support arms 11a and 11b. The haymaking machine 1 further comprises a boom 13 with wheels. At a front end in the direction of travel F, the drawbar 12 is attached to a tractor (not shown). As can be seen from the Fig. 1 and Fig. 2, the two rake rotors 2a, 2b are arranged one behind the other in the direction of travel F, ie the rotor axes A are arranged one behind the other in the direction of travel F and on opposite sides of the drawbar 12. In connection with the Fig. 1 to 9b the calculating gyroscopes are explained in more detail.

[0034] The gyroscopes 2a, 2b each have a rotor housing 3. The rotor housing 3 comprises, as is generally known and exemplified in Fig. 3, Fig. 9a and Fig. 9b, a cast housing with arm bearings 7, in which the tine arms 4 (some of which are only partially shown) are mounted, as well as an outer housing ( Fig. 9a), which can be assembled with the cast housing and rotated around the rotor axis A. The number of tine arms can vary - the number in the different figures is purely exemplary.

[0035] Fig. Figure 9b shows a schematic section through part of a raking gyroscope 2a, 2b. The rotor housing 3 is driven in rotation by a gear in a known manner, for example, by a bevel gear mounted in a corresponding housing. The tine arms 4 arranged in the arm bearings 7 are driven via the rotor housing 3. As can be seen from Fig. 1 and Fig. 2, the tine arms 4 have a tine pack section 5, ie a section on which a tine pack 5 is arranged. The tine pack 5 has several raking tines 8 arranged parallel to one another. The pivot angle α about the longitudinal axis L of the tine arms 4 can be adjusted during the rotation of the tine arms 4 about the rotor axis A (see Fig. 2). For this purpose, the corresponding tine arms 4 have a lever 80, in particular a roller lever 80 with a roller 9, at their end facing the rotor axis A, wherein the tine arms 4 are each connected to the levers 80 in a rotationally fixed manner. The end 9 of the lever 80 facing away from the respective tine arm 4 is guided in a curved path 6. Preferably, the end region of the lever 80 is designed as a roller 9, which rolls in the curved path 6, as can be seen in particular from the Fig. 9b. The support surface of the cam track 6 for the roller 9 changes in height during one revolution. As is generally known, the swivel angle α of the tine pack section 5 also changes due to the vertical movement of the roller lever 80. Fig. 1 and Fig. 2 (as well as the Fig. 12 and Fig. 13) the rake tines 8 are shown curved, but are preferably straight, as in connection with Fig. 6 will be explained in more detail below and is currently being trained.

[0036] As can be seen in particular from the Fig. 1 and Fig. 2, the two rake rotors 2a, 2b rotate in a first direction of rotation, here anti-clockwise, to produce a side swath 14.

[0037] To create a central swath 15, as shown in the Fig. 1 and Fig. As shown in Figure 2, the rotation direction of the rear rake rotor 2b is reversed to a second, opposite direction, in this case, clockwise. The front rake rotor 2a maintains the first direction of rotation, i.e., counterclockwise.

[0038] According to the present invention, it is provided that at least the central axis Z of the tine package section 5 of the tine arm 4 extends substantially in the radial direction with respect to the rotor axis A.

[0039] Fig. Figure 4 shows a schematic cross-section through the rear rake rotor, where the tine arms 4 can be constructed in two parts, ie, they comprise a rotor arm shaft 4a and a part 4b of the tine arm 4, which can be attached to the rotor arm shaft 4a via a fastening device. This is only an example. For the sake of simplicity, not all tine arm parts 4b are shown here. As can be seen from the Fig. As can be seen from Figure 4, in this exemplary embodiment, both the central axis M of the arm bearing 7 and the entire central axis L of the tine arm, and thus also the central axis Z of the tine assembly section 5, extend in the radial direction, i.e., the central axes L, M, and Z coincide. Due to the radial alignment, the rear rake rotor can be rotated in opposite directions and operate reliably in both directions. This would only be possible to a limited extent with tangentially mounted arm bearings 7, since this always results in a pulling direction.

[0040] What is important here is that the tine package section 5 extends essentially radially to the rotation axis A.

[0041] Essentially radial or “non-tangential” also includes embodiments such as those described in Fig. 5 are shown, and for which the center offset V of the longitudinal axis L of the tine arm 4 to the rotor axis A, ie the distance, is <100 mm, for the rear rake rotor 2b. The distance or center offset is the perpendicular from the rotor axis A to the longitudinal axis L of the rotor arm (or to a straight line on which the longitudinal axis lies). Fig. In the embodiment shown in Figure 5, the rotor arm is straight, so that the central axis M of the arm bearing 7, the longitudinal axis L of the tine arm, and the central axis Z of the tine assembly section 5 coincide. With a corresponding deviation, the rotor rake can still be driven in two opposite directions and function properly. In particular, the angle Y between the central axis L and a straight line g extending radially from the rotor axis A to the outer end E of the tine is < 6°, in particular < 4°.

[0042] As previously described, it is essential that the center axis Z of the tine pack section 5 extends to the rotor axis A in such a way that the center offset V is < 100 mm. Fig. 4 and Fig. In the embodiments shown in Figure 5, the center offset of the center axis M and the longitudinal axis L is also aligned such that the center offset V is < 100 mm. By positioning the tine arm as shown in Fig. 8, in case of deviation from a radial alignment at one point, for example point B in Fig. 8 (into the image plane, ie backwards), the alignment of the longitudinal axis Z in the tine assembly section 5 of the tine arm 4 can be further improved. In this context, it is important that the center offset of the center axis Z to the rotor axis A is < 100 mm, or the angle Y is < 4°, as described above. This embodiment allows the arm bearings 7 to be arranged such that the center offset of the center axis M of the arm bearing to the rotor axis A may be somewhat greater than 100 mm, in particular < 150, and the angle Y may be, for example, < 6°.

[0043] In order for the gyroscope 2b to function properly, as can be seen in particular from the Fig. 6 and Fig. As can be seen from Figure 7, the rake tines 8 are designed such that they extend straight, that is, at least in a region H extending from the lower tine end to at least 80% of the tine length I, i.e., the tine arms extend straight below the suspension 27 and are not curved to one side as is generally the case. Thus, this tine shape is particularly well suited for use in two opposite directions of rotation, i.e., for left-hand rotation and right-hand rotation.

[0044] Fig. 10a shows a top view of the rake rotor 2b and its working area AB. In this area, the tine arms 4 are pivoted by an angle α by the cam track such that the tine pack 5 moves downwards towards the ground to create a swath. The cam track of the rear rake rotor is, at least in this working area AB, symmetrical to an axis of symmetry S, which here extends, for example, in the direction of travel F. This means that, starting from the axis of symmetry S, the tine arm 4 is rotated away from the axis of symmetry by the same angular amount α around its longitudinal axis L, regardless of whether it is moved in a first or second direction of rotation. This contributes to flawless function in both directions of rotation. This is particularly advantageous in combination with the straight design of the tine arms 4 and the essentially radial alignment of the tine pack 5 or its central axis Z.

[0045] The axis of symmetry S does not necessarily have to be formed along the direction of travel F. Depending on the application, it can also deviate from the direction of travel F or, for example, Fig. The cam track 6 shown in Fig. 3 is arranged to be rotatable about the rotor axis A, so that the working area which is symmetrical to the axis of symmetry S can be rotated together with the cam track 6, in particular up to at least ± 30°.

[0046] Fig. 10b shows that in Fig. 10a, with a cam track 6 rotated to the left, such that the working area, together with the axis of symmetry S, also pivots to the left. A corresponding drive can be provided for this purpose, or the cam track can be manually rotated and reattached before operation. Advantageously, the rake tines 8 are perpendicular to the ground when the tine arm 4 extends along the axis of symmetry S (see also Fig. 6 and Fig. 7).

[0047] The haymaking machine 1 has a switching device for reversing the direction of rotation of the rear rake rotor 2b to generate a central swath. The switching device is preferably operated via an actuating device from the tractor cab (not shown).

[0048] The switching device may comprise a drive for the rear rake rotor.

[0049] Various drives are suitable for this purpose, such as an electric drive with a reversible direction of rotation. It is particularly advantageous, simple, and cost-effective if the drive is designed as a hydraulic motor 17.

[0050] According to a preferred embodiment, the hydraulic motor is as shown in Fig. 11, is designed as a superposition drive 17. Fig. 11 shows the drive train 16 for the rear rake rotor 2b. The rear rake rotor is, as in Fig. 11 is indicated schematically, in a first direction of rotation via an intermediate shaft 18 driven by the main propeller shaft 30, through the center gear 19 and the rear side propeller shaft X10.

[0051] The front rake rotor then moves in the same first direction of rotation and is also mechanically driven via the drive train, for example, by the tractor's PTO. 19 denotes a central gearbox for driving the front rake rotor 2a. This means that for the side swath, a through drive via the PTO shaft 18 to the rear rake rotor, i.e., to the rear rotor, results. The drive train 16 can also be Fig. 2. The superposition drive 17 is connected to the tractor hydraulics. To generate the side swath, the hydraulic oil circulates without resistance in the hydraulic motor from P to T. To generate the center swath, the hydraulic motor 17 is driven in the opposite direction by the tractor hydraulics. This is shown schematically in Fig. 11 is realized by the freewheel 20. The rear rake rotor now rotates in the opposite direction, e.g., clockwise.

[0052] Fig. Figure 12 shows a further embodiment according to the present invention. Here, too, the drive is a hydraulic motor 17 connected to the tractor's hydraulic system. The rear rake rotor 2b is driven purely hydraulically, i.e., in both directions of rotation via the hydraulic motor 17. The oil flow and direction of rotation can then be controlled from the tractor cab. The front rake rotor 2a can then be driven via the drive train 16, i.e., via the driven universal joint shaft.

[0053] Fig. Figure 13 shows a further embodiment according to the present invention, in which the front rake rotor 2a is now mechanically driven. The drive shaft on the center gearbox 19 drives the hydraulic pump 17a, which supplies the hydraulic motor 17 on the rear rotor 2b via hoses. The hydraulic pump 17a is driven by the tractor's PTO 30. Waste heat generated by power loss is dissipated, for example, via the tank reservoir integrated into the main frame. This eliminates the need for a separate oil cooler. The oil flow and direction of rotation of the rear rake rotor are controlled by a directional valve x1, which is operated by a pilot box in the tractor cab.

[0054] According to a further embodiment, as shown in the Fig. 14a and Fig. As shown in Figure 14b, a reversing gear 21 is provided in the drive train 16 for the rear rake rotor 2b. Both rake rotors are mechanically driven, with the direction change of the rear rake rotor taking place via the reversing gear 21.

[0055] Fig. Figure 14a shows a tractor 26, via whose power take-off shaft the mechanical drive is provided. The input shaft 28 of the gearbox 21 rotates in a first direction of rotation R1, which corresponds to the direction of rotation R1 of the output shaft 27. To produce the side swath, as shown in Fig. As can be seen in Figure 14a, the shift shaft 24 is actuated in the reversing gear 21 and the shift sleeve 22 connects the input shaft 28 with the output shaft 27 for the rear rotor, ie the rear rake rotor, so that, for example, both rotors rotate counterclockwise. The idler gear 25 is not engaged with the output shaft 27 and rotates freely, as shown in Fig. 14a is shown.

[0056] To produce the central swath, as in Fig. As shown in Figure 14b, the reversing gear 21 is switched such that the output shaft 27 rotates in the opposite direction of rotation R2. The selector shaft 24 decouples the selector sleeve 22 from the fixed gear 23 and connects the idler gear 25 to the output shaft 27. Thus, both rotors rotate in different directions. The rear rotor 2b rotates clockwise.

[0057] The above-mentioned embodiments enable a simple changeover from side swath to center swath and vice versa without the need for conversion, especially from the tractor cab.

[0058] In the method according to the invention for producing a side swath or a center swath, both rake rotors can be driven in a first direction of rotation, e.g. counterclockwise, to produce a side swath and the front rake rotor can be driven in a first direction of rotation and the direction of rotation of the rear rake circle 2b can be switched to a second opposite direction of rotation, e.g. clockwise, without converting the rake tines 8 or the rake tine package 5 and the cam track 6.

[0059] The same rake tines 8 and the same cam track 6 of the rear rake rotor can be used for both directions of rotation and switching can preferably be carried out by actuating an actuating device, in particular from the tractor cab. 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] EP 0 559 024 A1

[0004]

Claims

[1] Haymaking machine (1), in particular a swather, with two rake rotors (2a, 2b), each comprising: - a rotor housing (3), - several tine arms (4) rotating around a rotor axis (A) and mounted in a respective arm bearing (7) with a tine package section (5) and - a cam track (6) in the rotor housing (3), via which a pivoting angle (α) of the respective tine arm can be controlled depending on the rotational position of the tine arm (4) characterized by that the direction of rotation of the rear rake gyroscope around the rotor axis (A), viewed in the direction of travel (F), is reversible without mechanical conversion. [2] Haymaking machine (1) according to claim 1, characterized by that the central axis (Z) of the tine package section of the rear rake rotor extends substantially in the radial direction starting from the rotor axis (A). [3] Haymaking machine according to claim 1 or 2, characterized bythat for the rear rake rotor (2b) the center offset (V) of the center axis (Z) of the respective tine package section (5) to the rotor axis (A) is less than 100 mm and preferably the angle (γ) between the center axis (z) of the tine package section (5) and a straight line (g) extending radially from the rotor axis (A) to the outer end E of the tine arm (4) is < 6 °, in particular < 4 °. [4] Haymaking machine according to at least one of claims 1 to 3, characterized by that in the rear rake rotor (2b) the center offset of the center axis M of the arm bearing (7) to the rotor axis is < 150 mm, in particular < 100 mm and in particular the angle (γ) between the center axis M of the arm bearing and a straight line (g) extending radially from the rotor axis (A) to the outer end E of the tine arm (4) is < 6 °, in particular < 4 °. [5] Haymaking machine according to at least one of claims 1 to 4, characterized bythat the curved path (6) of the rear rake gyroscope (2b) is designed symmetrically to an axis of symmetry (S), which preferably extends in the direction of travel (F), at least in a working area (AB) of the rake gyroscope, wherein the working area (AB) of the rake gyroscope is preferably arranged on the front side of the rear rake gyroscope viewed in the direction of travel and extends from the axis of symmetry (S) to both sides by an angular range of 50-75 °. [6] Haymaking machine according to claim 5, characterized by that the cam track (6) is rotatable about the rotor axis (A), in particular up to at least + / - 30 °. [7] Haymaking machine according to at least one of claims 1 to 6, characterized bythat the raking tines (8) of the tine package are straight, in particular at least in a region (H) extending from the lower tine end to at least 80% of the tine length I, and preferably the raking tines of a tine arm (4) extending along the axis of symmetry (S) of the working area (AB) extend vertically downwards. [8] Haymaking machine according to at least one of claims 1 to 7, characterized by that the haymaking machine has a switching device for reversing the direction of rotation of the rear rake circuit (2b), which can preferably be actuated via an actuating device from the tractor cab. [9] Haymaking machine according to claim 8, characterized by that the switching device comprises a drive (17) for the rear rake gyroscope (2b). [10] Haymaking machine according to claim 9, characterized by that the drive (17) is a motor, in particular a hydraulic motor or electric motor. [11] Haymaking machine according to claim 10, characterized by in that the hydraulic motor is designed as a superposition drive (17) for the rear rake rotor (2b), wherein the rear rake rotor (2b) is driven in a first direction of rotation via a cardan shaft driven by the tractor PTO shaft (30) and is driven in a second opposite direction of rotation with a freewheel (20) in the drive train via the hydraulic motor (17), wherein the hydraulic motor (17) is driven in particular by the tractor hydraulics. [12] Haymaking machine according to claim 10, characterized by that the rear rake rotor (2b) is driven in a first direction of rotation and in an opposite second direction of rotation by the hydraulic motor (10). [13] Haymaking machine according to claim 10, characterized bythat the hydraulic motor (17) is attached to the rotor gearbox of the rear rake circuit and a hydraulic pump (17a) is provided which is mounted behind a central gearbox (19) and is driven by the tractor PTO shaft (30) and the direction of rotation of the rear rake rotor (2b) is controlled via a directional control valve (X1). [14] Haymaking machine according to claim 8, characterized by that both rake rotors (2a, 2b) are driven in a first direction of rotation via a mechanical drive, in particular a cardan shaft, and the switching device has a reversing gear (21) such that the rear rake rotor (2b) can be driven in a second direction of rotation opposite to the first direction of rotation. [15] Method for producing a side swath or a central swath with a device according to at least one of claims 1 to 14, characterized by , that to produce a side swath (14) both rake rotors are driven in a first direction of rotation and to produce a central swath (15), the front rake rotor (2a) is driven in a first direction of rotation and the direction of rotation of the rear rake circuit (2b) is switched to a second opposite direction of rotation without retooling the rake tines and the cam track (6). [16] Method according to claim 15, characterized by that the same rake tines (8) and the same cam track (6) of the rear rake circuit are used for both directions of rotation and the switching is preferably carried out by actuating an actuating device, in particular from the tractor cab.

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