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

Abstract

The invention relates to a haymaking machine (1), in particular a rake, with two rake heads (2a, 2b) and a method for producing a side swath or a center swath, wherein the rake heads each comprise: 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 pack section (5), and a cam track (6) in the rotor housing (3), via which a pivot angle of the respective tine arm can be controlled depending on the rotational position of the tine arm (4), wherein the direction of rotation of the rake head located at the rear in the direction of travel (F) around the rotor axis (A) can be reversed without mechanical conversion.

Description

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

[0002] Haymaking machines with two calculating gyroscopes are already known from the prior art.

[0003] The usual 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 common center swath from both rake rotors. Nevertheless, crop intake devices such as balers, forage harvesters, and loader wagons prefer a center swath.

[0004] From EP 0 559 024 A1, a haymaking machine for producing a center swath is already known, featuring two rake rotors arranged at the same height on opposite sides of a drawbar. With this haymaking machine, producing a side swath requires a complicated adjustment of the drawbar's angle relative to the direction of travel. It is possible to reverse the direction of rotation of a rake rotor to produce a center swath. However, this is only possible by completely reconfiguring the machine. This involves modifying the cam discs and the entire tine carrier assembly with corresponding tine packs for the changed direction of rotation. For this reason, this concept has not gained market acceptance.

[0005] Based on this, the present invention aims to provide a haymaking machine and a corresponding method that allows a simple change from side swath to center swath laying.

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

[0007] According to the invention, the haymaking machine, in particular a rake, has two rake heads. The rake heads each comprise a rotor housing, several tine arms rotating around a rotor axis and mounted in a respective arm bearing, each with a tine bundle section, and a cam track in the rotor housing, wherein a pivot angle of the respective tine arm about a longitudinal axis L can be controlled via the cam track depending on the rotating 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 reconfiguration. "Rear rake rotor" in the direction of travel means that the rotor axes are arranged one behind the other and on opposite sides with respect to the central longitudinal axis of the drawbar. The orbital paths of the tine packs of the two rake rotors do not overlap during center swath placement.

[0009] By arranging the rake heads one behind the other, it is possible to create a side swath when both rake heads rotate in the same direction, even if, for example, the drawbar extends in the direction of travel. If, according to the invention, the direction of rotation of the rear rake head is reversed, a simple and reliable switch from side swath to center swath is possible, and the harvested crop, such as hay, can be effectively conveyed from the outside to the center by the front rake head and then also from the outside to the center by the rear rake head, even if the drawbar extends in the direction of travel.

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

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

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

[0013] In this application, a substantially radial arrangement of the tine assembly section also includes orientations of the tine assembly section's central axis that deviate slightly from a perfectly radial arrangement. This means, for example, that for the respective rear rotary gyroscope, the center offset of the tine assembly section's central axis to the rotor axis is less than 100 mm. Here, the extended central axis is considered, i.e., a straight line on which the tine assembly section's central axis lies. The center offset is the distance of the rotor axis to the central axis, i.e., the perpendicular from the rotor axis to the central axis. This center offset is acceptable for proper function, for example, with tine gyroscope diameters of 3 m or greater.

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

[0015] In this design, the respective rear rake heads are suitable for both directions, which would not be possible with the tangential arrangement of the tine packs known from the prior art. The respective tine pack is therefore always correctly aligned, regardless of the direction of rotation.

[0016] As previously described, it is important that at least the tine assembly section extends essentially radially. It is possible that the arm bearing is already aligned accordingly in an essentially radial direction.

[0017] According to a further embodiment, the center offset of the central axis M of the arm bearing to the rotor axis can therefore be less than 150 mm, in particular less than 100 mm. Preferably, the angle Y between the central 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 pack section then has a center offset of less than 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° to allow for precise alignment of the tine pack section.

[0019] According to a further preferred embodiment, which further facilitates the generation of the central swath, the curved path of the rear calculating gyroscope is symmetrical about an axis of symmetry S, at least in one working area, i.e., at least in one partial area, i.e., a partial angular area (partial angular area of ​​360°) of the calculating gyroscope, wherein the axis of symmetry preferably extends in the direction of travel. This ensures that even when the direction of rotation is reversed, the tine bundle cuts are rotated by the same angle α about their longitudinal axis.

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

[0021] It is particularly advantageous if the cam track is rotatable around the rotor axis A, especially by at least + / -30°. This allows the working area to be swivelled relative to the direction of travel along with the axis of symmetry, in order 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 downwards. Preferably, the rake tines are straight. Thus, the rake tines are not curved to one side, so that they can be used equally well in both directions of rotation.

[0023] Advantageously, the haymaking machine has a switching device to reverse the direction of rotation of the rear rake. Preferably, this switching device can be operated from the tractor cab via a control unit.

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

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

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

[0027] According to another 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 by a driveshaft. The hydraulic motor(s) can then be driven by the tractor's hydraulic system. To increase power, 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 driven by the tractor's power take-off (PTO) can be provided. The hydraulic pump can be mounted behind the central 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 that both calculating gyroscopes are driven in a first direction of rotation via a mechanical drive, in particular a cardan shaft, and that the switching device has a reversing gear, such that the rear calculating gyroscope can be driven in a second direction of rotation opposite to the first direction of rotation.

[0029] According to the inventive method for generating a side swath or a center swath according to claim 15, to generate a side swath both rake heads are driven in a first direction of rotation and to generate a center swath the front rake head is driven in a first direction of rotation and the direction of rotation of the rear rake head is switched to a second opposite direction of rotation without reconfiguring the rake tines and cam track.

[0030] According to a preferred embodiment, the same rake tines and the same cam track of the rear rake gyroscope are used for both directions of rotation, and switching is preferably carried out by actuating an actuating device, particularly from the tractor cab, i.e. without conversion.

[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. Figure 1 shows a top view of a haymaking machine according to an embodiment of the present invention. Fig. Figure 2 shows a perspective view of a haymaking machine according to an embodiment of the present invention. Fig. Figure 3 shows a part of the rotor in a perspective exploded view. Fig. Figure 4 shows a top view of a first embodiment with radially extending tine arms. Fig. Figure 5 shows a top view of a further embodiment according to the present invention, which is essentially the same as that described in Figure 5. Fig. 4 corresponds to the exemplary embodiment shown. Fig. Figure 6 shows in perspective the in Fig. 5 shown embodiment. Fig. 7 shows that in Fig. 6. Example shown in side view. Fig. Figure 8 shows an embodiment according to a further embodiment of the present invention. Fig. Figure 9a shows a perspective external view of a rotor housing according to an embodiment of the present invention. Fig. Figure 9b shows a longitudinal section through a rotor housing according to an embodiment of the present invention. Fig. Figure 10a schematically shows a working area according to the present invention. Fig. 10b shows a pivoted working area according to the present invention Fig. Figure 11 shows in a perspective schematic representation a rough schematic embodiment with a superposition drive according to the present invention. Fig. Figure 12 schematically shows another embodiment with a hydraulic motor according to an embodiment of the present invention. Fig. Figure 13 schematically shows another embodiment according to the present invention with two hydraulic motors. Fig. Figure 14a shows a roughly schematic reversing gear in a first direction of rotation according to the present invention. Fig. Figure 14b shows a rough schematic of the reversing gear. 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 heads 2a, 2b. The rake heads 2a, 2b are attached to a drawbar 12 or a frame via corresponding support arms 11a and 11b. The haymaking machine 1 also has a boom 13 with wheels. At a forward 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. As can be seen from Figure 2, the two calculating gyroscopes 2a, 2b are arranged one behind the other in the direction of travel F, i.e., 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. Sections 1 to 9b explain the calculating gyroscopes in more detail.

[0034] The calculating gyroscopes 2a and 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. Figure 9b shows a cast housing with arm bearings 7 in which the (partially only partially shown) tine arms 4 are mounted, as well as an outer housing ( Fig. 9a), which is rotatable around the rotor axis A with the cast housing. The number of tine arms can vary – the number shown in the different figures is purely exemplary.

[0035] Fig. Figure 9b schematically shows a section through a part of a calculating gyroscope 2a, 2b. The rotor housing 3 is driven, for example, by a known gearbox, such as a bevel gear drive mounted in a suitable housing. The prong arms 4, arranged in the arm bearings 7, are driven via the rotor housing 3. As can be seen from Fig. 1 and Fig. As can be seen from Figure 2, the tine arms 4 have a tine pack section 5, i.e., a section on which a tine pack 5 is arranged. The tine pack 5 has several rake tines 8 arranged parallel to each other. 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 Figure 2). 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 rotationally fixed to the levers 80. The end 9 of the lever 80 facing away from the respective tine arm 4 is guided in a cam track 6. Preferably, the end region of the lever 80 is designed as a roller 9 that rolls in the cam track 6, as can be seen in particular from the Fig. 9b. The contact 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 assembly section 5 also changes due to the vertical movement of the roller lever 80. In the Fig. 1 and Fig. 2 (as well as the Fig. 12 and Fig. 13) The rake teeth 8 are shown curved, but are preferably straight, as in connection with Fig. 6. Further details will be explained below. Training is currently underway.

[0036] As can be seen in particular from the Fig. 1 and Fig. As 2 emerges, the two calculating gyroscopes 2a, 2b rotate in a first direction of rotation, here counterclockwise, to generate a side swath 14.

[0037] To create a central swath 15, as described in the Fig. 1 and Fig. Figure 2 shows the direction of rotation of the rear calculating gyroscope 2b in a second, opposite direction of rotation, here clockwise. The front calculating gyroscope 2a retains 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 pack section 5 of the tine arm 4 extends substantially in the radial direction with respect to the rotor axis A.

[0039] Fig. Figure 4 schematically shows a cross-section through the rear rake gyroscope, where the tine arms 4 can be constructed in two parts, i.e., comprising a gyroscope arm shaft 4a and a part 4b of the tine arm 4, which can be attached to the gyroscope 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 shown in Figure 4, in this 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 radially; that is, the central axes L, M, and Z coincide. Due to this radial orientation, the rear gyroscope 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, as this would always result in a direction of pull.

[0040] The essential point here is that the tine package section 5 extends essentially radially to the axis of rotation A.

[0041] Essentially radial or "non-tangential" designs also include embodiments such as those found, for example, in Fig. Figure 5 shows the following diagrams, where the center offset V of the longitudinal axis L of the tine arm 4 to the rotor axis A, i.e., the distance, is <100 mm for the rear calculating gyroscope 2b. This distance, or center offset, is the perpendicular from the rotor axis A to the longitudinal axis L of the gyroscope arm (or to a straight line on which the longitudinal axis lies). In the diagram shown... Fig. In the embodiment shown in Figure 5, the gyroscope arm is straight, so that the central axis M of the arm bearing 7 and the longitudinal axis L of the tine arm, including the central axis Z of the tine assembly section 5, coincide. Even with a corresponding deviation, the calculating gyroscope can still be driven in two opposite directions and function perfectly. In particular, the angle Y between the central axis L and a straight line 9 extending radially from the rotor axis A to the outer end E of the tine is < 6°, and in particular < 4°.

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

[0043] In order for the calculating 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 end of the tine to at least 80% of the tine length l, i.e., that 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 counterclockwise and clockwise rotation.

[0044] Fig. Figure 10a shows a top view of the rotary encoder 2b and its working area AB. In this area, the tine arms 4 are pivoted by the cam track by an angle α such that the tine assembly 5 moves downwards towards the ground to create a swath. The cam track of the rear rotary encoder is symmetrical about an axis of symmetry S, which here extends, for example, in the direction of travel F, at least in this working area AB. 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 angle α about its longitudinal axis L, regardless of whether it is moved in a first or second direction of rotation. This contributes to reliable operation in both directions of rotation. This is particularly advantageous in combination with the straight design of the tine arms 4 and the essentially radial orientation of the tine assembly 5 or its central axis Z.

[0045] The axis of symmetry S does not necessarily have to run along the direction of travel F. Depending on the application, it can also deviate from the direction of travel F or, for example, be located in a specific direction. Fig. 3 The cam track 6 shown is rotatably arranged 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 this in Fig. The embodiment shown in Figure 10a features 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 Figure 10a). Fig. 6 and Fig. 7).

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

[0048] The switching device may include a drive for the rear calculating gyroscope.

[0049] Various drives are suitable for this purpose, such as an electric drive whose direction of rotation is reversible. 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 in Fig. 11 is shown, designed as a superposition drive 17. Fig. Figure 11 shows the drive train 16 for the rear computational gyroscope 2b. The rear computational gyroscope is, as in Fig. 11 schematically indicated, in a first direction of rotation via an intermediate shaft 18 driven by the main driveshaft 30, through the central gearbox 19 and the rear side driveshaft X10.

[0051] The front rotary rake then moves in the same initial direction of rotation and is, for example, mechanically driven by the tractor's power take-off shaft via the drive train. A central gearbox for driving the front rotary rake 2a is designated as 19. This means that for the side swath, a through-drive is provided via the driveshaft 18 to the rear rotary rake, i.e., to the rear rotor. The drive train 16 can also be used in Fig. 2. The superimposed 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. The freewheel shown in Figure 11 is realized in Figure 20. The rear calculating gyroscope now rotates in the opposite direction, i.e., for example, clockwise.

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

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

[0054] According to another embodiment, as 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 calculating gyroscope 2b. Both calculating gyroscopes are mechanically driven, with the change of direction of the rear calculating gyroscope being effected via the reversing gear 21.

[0055] Fig. Figure 14a shows a tractor 26 whose power take-off (PTO) provides the mechanical drive. The input shaft 28 of the gearbox 21 rotates here in a first direction of rotation R1, which corresponds to the direction of rotation R1 of the output shaft 27. To generate the side swath, as shown in Fig. As shown in Figure 14a, the reversing gear 21 actuates the shift shaft 24, and the shift sleeve 22 connects the input shaft 28 with the output shaft 27 for the rear rotor, i.e., the rear rake, so that, for example, both rotors rotate counterclockwise. The loose gear 25 is not engaged with the output shaft 27 and rotates freely, as shown in Figure 14a. Fig. 14a is shown.

[0056] To generate the central swath, the following procedure is used as described in... Fig. Figure 14b shows the reversing gear 21 engaged such that the output shaft 27 rotates in the opposite direction R2. The shift shaft 24 disengages the shift sleeve 22 from the fixed gear 23 and connects the loose gear 25 to the output shaft 27. Thus, both calculating gyroscopes are rotated in opposite directions. The rear calculating gyroscope 2b rotates clockwise.

[0057] The aforementioned embodiments allow for a simple changeover from side swath to center swath and vice versa, without the need for any conversion, especially from the tractor cab.

[0058] In the inventive method for generating a side swath or a center swath, to generate a side swath both calculating circles can be driven in a first direction of rotation, e.g. counterclockwise, and to generate a center swath the front calculating circle can be driven in a first direction of rotation and the direction of rotation of the rear calculating circle 2b can be switched to a second opposite direction of rotation, e.g. clockwise, without reconfiguring 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 gyroscope 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.

Claims

[1] Haymaking machine (1), in particular swather, with two calculating gyrlets (2a,2b) each comprising: - a rotor housing (3), - several tine arms (4) rotating around a rotor axis (A) and supported in a respective arm bearing (7) with a tine pack section (5) and - a curved track (6) in the rotor housing (3) via which a swivel angle (α) of the respective tine arm (4) can be controlled depending on the rotational position of the tine arm (4), characterized by , that the direction of rotation of the rear computational gyroscope (2b), viewed in the direction of travel (F), about the rotor axis (A) can be reversed without mechanical conversion and the calculating gyroscopes (2a,2b) are arranged one behind the other in the direction of travel, if a drawbar (12) extends in the direction of travel and a side swath (14) can be generated, if the two calculating gyroscopes (2a,2b) run in the same direction of rotation and if the direction of rotation of the rear gyroscope (2b) is reversed, it is possible to switch from side swath (14) to center swath (15). [2] Haymaking machine (1) according to claim 1, characterized by , that the central axis (Z) of the tine pack section of the rear calculating gyroscope (2b) extends substantially in a radial direction from the rotor axis (A). [3] Haymaking machine according to claim 1 or 2, characterized by, that for the rear calculating gyroscope (2b) the center offset (V) of the central axis (Z) of the respective tine pack section (5) to the rotor axis (A) is less than 100 mm and preferably the angle (γ) between the central axis (Z) of the tine pack section (5) and a straight line (9) 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 calculating gyroscope (2b) the center offset of the central 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 central axis (M) of the arm bearing and a straight line (9) 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 by, that the curved path (6) of the rear computational gyroscope (2b) is symmetrical about an axis of symmetry (S) which preferably extends in the direction of travel (F) at least in a working area (AB) of the computational gyroscope, wherein preferably the working area (AB) of the computational gyroscope is arranged on the front side of the rear computational gyroscope as viewed in the direction of travel and extends from the axis of symmetry (S) to both sides by an angle range of 50-75°. [6] Haymaking machine according to claim 5, characterized by , that the curved path (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 by, that the rake tines (8) of the tine pack 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 rake 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 to reverse the direction of rotation of the rear calculating circuit (2b), which is preferably operable via an actuating device from the tractor cab. [9] Haymaking machine according to claim 8, characterized by , that the switching device includes a drive (17) for the rear calculating gyroscope (2b). [10] Haymaking machine according to claim 9, characterized by that the drive (17) is a motor, in particular a hydraulic motor (17) or an electric motor. [11] Haymaking machine according to claim 10, characterized by , that the hydraulic motor (17) is designed as a superimposed drive (17) for the rear rake gyroscope (2b), wherein the rear rake gyroscope (2b) is driven in a first direction of rotation via a cardan shaft driven by a tractor power take-off shaft (30) and in a second opposite direction of rotation is driven with a freewheel (20) in the drive train via the hydraulic motor (17), wherein the hydraulic motor (17) is in particular driven by the tractor hydraulics. [12] Haymaking machine according to claim 10, characterized by , that the rear calculating gyroscope (2b) is driven in a first direction of rotation and in an opposite second direction of rotation by the hydraulic motor (17). [13] Haymaking machine according to claim 10, characterized by, that the hydraulic motor (17) is attached to the rotary gearbox of the rear racking circuit and a hydraulic pump (17a) is provided which is mounted behind a central gearbox (19) and is driven by the tractor's power take-off shaft (30) and the direction of rotation of the rear racking gyroscope (2b) is controlled via a directional control valve (X1). [14] Haymaking machine according to claim 8, characterized by , that both calculating gyroscopes (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 calculating gyroscope (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 center swath with a device according to at least one of claims 1 to 14, characterized by , that a drawbar (12) extends in the direction of travel and the calculating gyroscopes (2a,2b) are arranged one behind the other in the direction of travel, wherein to generate a side swath (14) both calculating gyroscopes are driven in a first direction of rotation and To generate a central swath (15), the front calculating gyroscope (2a) is driven in a first direction of rotation and the direction of rotation of the rear calculating gyroscope (2b) is switched to a second opposite direction of rotation without reconfiguring 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 gyroscope (2b) are used for both directions of rotation and that switching is preferably carried out by actuating an actuating device, in particular from the tractor cab.

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