Work Machine

Abstract

To provide a working machine which makes a groove depth of a ridge constant.SOLUTION: A working machine 1 includes: a tilling part 18 tilling a field; and a furrowing member Z which furrows the field tilled by the tilling part 18 to form a ridge UN. The tilling part 18 has: a tilling tine 17 rotating around a horizontal shaft 16; a rotary machine frame 11 rotatably supporting the horizontal shaft 16; and a rear cover 19B which is vertically swingably fitted to the rotary machine frame 11 and covers the rear part of the tilling tine 17. The furrowing member Z is fitted to the rear cover 19B and can swing together with the rear cover 19B.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a work machine for cultivating a farm field and planting seedlings, for example. [Background technology]

[0002] 2. Description of the Related Art A working machine disclosed in Patent Document 1 is known in the art. The working machine disclosed in Patent Document 1 is capable of planting (transplanting) seedlings as well as performing ground work (tilling, etc.) while traveling. The working machine includes a tractor, a rotary tiller attached to the rear of the tractor, and a transplanter attached to the rotary tiller. The rotary tiller includes a tilling section for tilling a field, and is equipped with a ridger for forming ridges in the tilled field, and a mulch film laying device for laying mulch film on the ridges. The mulch film laying device includes a film roll support shaft, a film presser, a soil covering member, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-29 A Summary of the Invention [Problem to be solved by the invention]

[0004] The working machine described in Patent Document 1 is equipped with a groove cutting member that forms an embedding groove for embedding the width direction end of the mulch film that is unwound from the film roll and laid on the ridges. However, this groove cutting member forms a groove after the ridges are formed by the ridge forming tool, and does not form the ridges by cutting a groove in the field. Furthermore, when the tilling depth in the tilling section changes, the groove depth (the distance from the surface of the ridge to the bottom of the groove) also changes. In laying mulch film, it is preferable that the groove depth of the ridges is constant, but in the conventional working machine, the groove depth changes according to the change in the tilling depth and is not constant.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a work machine that can cut trenches in a farm field to form ridges and can keep the depth of the trenches constant. [Means for solving the problem]

[0006] A working machine according to one aspect of the present invention includes a tilling section for tilling a field, and a furrow cutting member for cutting furrows in the field tilled by the tilling section to form ridges. The tilling section has tilling tines that rotate around a horizontal axis, a rotary machine frame that rotatably supports the horizontal axis, and a rear cover that is attached to the rotary machine frame so as to be swingable in the vertical direction and covers the rear of the tilling tines. The furrow cutting member is, A ridge forming device for forming flat ridges in a farm field, The rear cover is attached to the rear cover and is swingable together with the rear cover.

[0007] The groove cutting member is attached to a mounting frame attached to the rear cover and is movable along the mounting frame in a direction parallel to the horizontal axis. The system also includes a mulch film laying device that lays mulch film on the ridges, the mulch film laying device having a film pressing roller that presses down the widthwise ends of the laid mulch film, and the film pressing roller rolls along the grooves cut by the groove cutting member to bend the ends.

[0008] The mulch film laying device also has a soil covering member that covers with soil the end of the mulch film that has been folded by the film pressing roller. Also, A mulch film laying device that lays a mulch film on the ridges; The system comprises a planting device for planting seedlings in the furrows on which the mulch film is laid, an irrigation tube for supplying water to the seedlings planted by the planting device, and an irrigation tube guide for supporting the irrigation tube, the irrigation tube guide being attached to the mounting frame.

[0009] The groove cutting member has a rectangular shape in a plan view that forms the bottom surface of the groove. Consists of a flat plateA bottom plate, a front plate rising obliquely upward from the front edge of the bottom plate, a rear plate rising upward from the rear edge of the bottom plate, and Vertically Stand up The side of the ridge is formed almost vertically. and a side plate. The groove cutting member also includes a plurality of groove cutting members for forming a plurality of ridges, the plurality of groove cutting members being attached to the mounting frame at intervals in a direction parallel to the horizontal axis. Effect of the Invention

[0010] According to the above configuration, the furrow cutting member can cut furrows in the field to form ridges (flat ridges). In addition, since the rear cover is attached to the rotary machine frame so as to be able to swing up and down, the rear cover follows the surface of the field even if the tilling depth of the tilling section varies. Since the furrow cutting member is attached to the rear cover and can swing together with the rear cover, the depth of the furrows formed by the furrow cutting member is constant from the surface of the ridge regardless of variations in the tilling depth. [Brief description of the drawings]

[0011] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a side view of the tilling section and the mulch film laying device. [Figure 6] FIG. 6 is a bottom view of FIG. 5. [Figure 7] FIG. 7 is a plan view of FIG. [Figure 8] FIG. 8 is an enlarged view of the left part of FIG. [Figure 9] FIG. 9 is a perspective view of FIG. [Figure 10] FIG. 8 is an enlarged view of the center portion in the width direction of the machine in FIG. [Figure 11] FIG. 11 is a perspective view of FIG. [Figure 12]The upper part shows a plan view of "groove cutting members for flat ridges, film holding rollers, soil covering members, blades, mulch film, etc.", and the lower part shows a cross-sectional view of "the formed flat ridges, seedlings, mulch film with folded edges, and soil covering the mulch film." [Figure 13] This is a diagram of the "high ridge" type corresponding to Figure 5. [Figure 14] This is a diagram of the "high ridge" type corresponding to Figure 7. [Figure 15] This is a diagram of the "high ridge" type corresponding to Figure 8. [Figure 16] This is a diagram of the "high ridge" type corresponding to Figure 9. [Figure 17] This is a diagram of the "high ridge" type corresponding to Figure 10. [Figure 18] This is a diagram of the "high ridge" type corresponding to Figure 11. [Figure 19] This is a diagram of the "high ridge" type corresponding to Figure 12. [Figure 20] This is an oblique view showing the "mounting structure" on the left side in the aircraft width direction as viewed from the inside (right side) of the aircraft. [Figure 21] 21 is a perspective view showing the "mounting structure" of FIG. 20 as viewed from the outside (left side) of the fuselage. [Figure 22] FIG. 2 is a perspective view showing the "mounting structure" at the center in the width direction of the machine as viewed from the right side. [Figure 23] FIG. 4 is a front view for explaining the mulcher film mounting structure. [Figure 24] FIG. 24 is an enlarged view of the left half (first roll support shaft) of FIG. 23. [Diagram 25] 4 is a plan view of the other end side (other support portion) of the first roll support shaft and the second roll support shaft. FIG. [Figure 26] FIG. 2 is a perspective view of one end side (one supporting portion) of a first roll support shaft. [Figure 27] 4 is a perspective view of the other end side (other support portion) of the first roll support shaft and the second roll support shaft. FIG. [Figure 28] In FIG. 27, the roll support shaft is shown by a virtual line (two-dot chain line), and the locking member is omitted. [Figure 29]FIG. 4A is a cross-sectional view showing the locking member in an unlocked state, and FIG. 4B is a cross-sectional view showing the locking member in a locked state. [Diagram 30] FIG. 2 is a perspective view of the first ridger. [Diagram 31] FIG. 2 is a plan view of the first ridger. [Diagram 32] FIG. 2 is a bottom view of the first ridger. [Diagram 33] FIG. 1 is a rear view of the first ridger. [Diagram 34] FIG. 11 is a perspective view showing another embodiment of the first ridge creator as viewed from the left front. [Diagram 35] FIG. 11 is a perspective view showing another embodiment of the first ridger as viewed from the right rear. [Diagram 36] This is a diagram to explain that the planting frame and the mulcher arm are connected by a chain, and that the mulcher arm rises as the planting frame rises. [Figure 37] FIG. 13 is a diagram illustrating the mechanism by which the planting section frame rises. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a work machine 1 that can perform ground work (plowing, etc.) and plant (transplant) seedlings while traveling. The work machine 1 has a traveling body 1A and a ground work device 1B attached to the rear of the traveling body 1A. The ground work device 1B includes a first ground work machine 2 attached to the rear of the traveling body 1A so as to be able to rise and fall, and a second ground work machine 3 attached to the rear of the first ground work machine 2 so as to be able to rise and fall.

[0013] In this embodiment, a tractor, which is a traveling vehicle, is exemplified as the traveling body 1A. A rotary cultivator is exemplified as the first ground work machine 2. A transplanter that plants seedlings in a field is exemplified as the second ground work machine 3. Hereinafter, the traveling body will be referred to as the tractor 1A, the first ground work machine will be referred to as the rotary cultivator 2, and the second ground work machine will be referred to as the transplanter 3. The traveling body 1A is not limited to a tractor, and may be another traveling vehicle. The first ground work machine 2 is not limited to a rotary tiller, and may be any machine that works on a farm field. Although the rotary tiller 2 is exemplified as a center drive type rotary tiller, it may be a side drive type rotary tiller.

[0014] Fig. 1 shows a side view of the work machine 1. In this embodiment, unless otherwise specified, the front side (left side in Fig. 1) of the driver seated in the driver's seat 5 of the tractor 1A will be described as the front, the rear side of the driver (right side in Fig. 1) as the rear, the left side of the driver (near side in Fig. 1) as the left side, and the right side of the driver (far side in Fig. 1) as the right side. In addition, the horizontal direction K2 (see Fig. 3), which is a direction perpendicular to the front-rear direction K1 (see Fig. 1) of the tractor 1A, will be described as the machine width direction K2.

[0015] In addition, the direction from the center of the tractor 1A in the machine width direction to the right or left will be described as the machine width outward. In other words, the machine width outward is the machine width direction K2 of the tractor 1A. The inward direction is the direction away from the center in the width direction. The direction from the right or left side in the width direction of the tractor 1A toward the center will be described as the inward direction of the width. That is, the inward direction of the width is the opposite direction to the outward direction in the width direction. In other words, the inward direction of the width is the direction in the width direction K2 that approaches the center in the width direction of the tractor 1A.

[0016] As shown in Fig. 1, the tractor 1A has a body 6 and a traveling device 7 including front wheels 7F attached to the front part of the body 6 and rear wheels 7R attached to the rear part of the body 6. The body 6 has a prime mover (drive source) E1 and a power transmission case T1 connected to the rear part of the prime mover E1. The prime mover E1 drives the traveling device 7. The prime mover E1 is, for example, a diesel engine, or may be a gasoline engine, an LPG engine, or an electric motor, or may be a hybrid type having an engine and an electric motor.

[0017] The power transmission case T1 is configured by directly connecting a clutch housing incorporating a clutch, a transmission case incorporating a speed change device, a differential case incorporating a differential device, and the like. A driver's seat 5 is mounted on the rear of the vehicle body 6, and a power take-off shaft (PTO shaft) 22 for taking off the power of the prime mover E1 is provided in a rearward protruding manner. That is, the traveling body 1A has a power take-off shaft 22 for taking off the power of the prime mover E1. A steering wheel 8 is provided in front of the driver's seat 5. In addition, the tractor 1A is equipped with a battery (not shown) in the front.

[0018] As shown in FIG. 1, the rotary tiller 2 is mounted on the rear of the tractor 1A via a mounting mechanism such as a three-point linkage 9 so as to be able to rise and fall. The three-point linkage 9 has a top link 9A and a lower link 9B, and is mounted on the rear of the vehicle body 6. A lift link 10A capable of swinging up and down is provided on the rear of the vehicle body 6, and the lift link 10A is connected to the lower link 9B via a lift rod 10B. The lift link 10A is driven to rise and fall by a hydraulic device 10C provided on the upper rear part of the vehicle body 6, and the lower link 9B is raised and lowered as the lift link 10A moves up and down. This causes the rotary tiller 2 to rise and fall.

[0019] The rotary tiller 2 has a transmission case 12 that receives the power of the PTO shaft 22 of the tractor 1A via a universal joint (not shown). The transmission case 12 is located at the center of the width direction of the rotary tiller 2 (the same direction as the machine width direction K2). 2 and 3 are detailed views of the ground work apparatus 1 B. The ground work apparatus 1 B has a rotary cultivator 2 and a transplanter 3.

[0020] The rotary cultivator 2 has a rotary machine frame 11, and the transplanter 3 has a transplanter frame 37. The rotary machine frame 11 and the transplanter frame 37 are connected to each other so as to be movable up and down by a connecting mechanism 41 consisting of a parallel link mechanism. This allows the rotary cultivator 2 and the transplanter 3 to move relative to each other in the up and down direction. As shown in Fig. 3, the rotary tiller 2 has the transmission case 12 at the center in the width direction K2. As shown in Fig. 2, a rotating shaft 16 is provided at the bottom of the transmission case 12. The rotating shaft 16 is provided so as to protrude from the bottom of the transmission case 12 to one side and the other side in the width direction K2. A large number of tilling tines 17 (see Figs. 5 and 6) are fixed to the outer periphery of the rotating shaft 16 via brackets. When the rotating shaft 16 rotates around its axis, the tilling tines 17 till the field and dump the tilled soil to a rear cover 19B at the rear. The rotating shaft 16 and the tilling tines 17 constitute a tilling section 18 that tills the field.

[0021] As shown in Figures 2 and 3, soil piling disks 56L, 56R are arranged in front of the rotary tiller 2. The soil piling disks 56L, 56R are members for piling soil inward in the width direction of the machine towards the tilling section 18. The soil piling disk 56L is arranged on one side (left side) in the width direction of the machine, and is located at the left front of the rotary tiller 2. The soil piling disk 56R is arranged on the other side (right side) in the width direction of the machine, and is located at the right front of the rotary tiller 2. The soil piling disks 56L, 56R are arranged at an angle so as to transition from the outside of the machine width to the inside of the machine width as they move from the front to the rear in a plan view.

[0022] As shown in Fig. 2, a ridge forming device A is provided at the rear of the rotary tiller 2. The ridge forming device A forms ridges UN (see Fig. 12) in a field tilled by the tilling section 18. In this embodiment, two ridges UN1, UN2 are formed as shown in Fig. 12, however, the number of ridges formed in the present invention is not limited to two. A mulch film laying device 300 is provided behind the ridge forming device A. The mulch film laying device 300 is provided at the rear of the rotary tiller 2 and located in front of the transplanter 3. The mulch film laying device 300 lays a mulch film 300F on the ridges UN (see FIG. 12).

[0023] 2, the transplanter 3 has a seedling supplying device 38, a planting device 39 provided below the seedling supplying device 38, a soil covering device 40 provided behind the planting device 39, and a seedling placement table 190 provided above the seedling supplying device 38. The seedling placement table 190 is provided with multiple stages and is used to place seedling trays containing seedlings to be transplanted. As shown in Fig. 3, the seedling supplying device 38 includes a plurality of seedling supplying devices (first seedling supplying device 38A and second seedling supplying device 38B) arranged in the machine width direction K2. A plurality of planting devices 39A, B and soil covering devices 40A, B are provided below the seedling supplying devices 38A, B, respectively (see Fig. 7). The planting device 39 has a planting tool 64 (see Fig. 2) that holds the seedlings from the seedling supplying device 38, descends, and enters the field to plant the seedlings.

[0024] By the ridge forming device A, a first ridge UN1 is formed in the field below the first seedling supplying device 38A, and a second ridge UN2 is formed in the field below the second seedling supplying device 38B (see FIG. 12). In the first furrow UN1, seedlings supplied from the first seedling supplying device 38A are planted in two rows by the planting device 39A. In the second furrow UN2, seedlings supplied from the second seedling supplying device 38B are planted in two rows by the transplanting device 39B.

[0025] As shown in FIG. 3, front chairs 187A, B and rear chairs 187C, D are provided in front of and behind each of the seedling supplying devices 38A, B. The front chairs 187A, B are mounted on the rotary machine frame 11 via a connecting mechanism 41 so as to be vertically movable. The rear chairs 187C, D are mounted on a seat frame 197 which is connected to the rotary machine frame 11 via a parallel link mechanism 200. The seat frame 197 is supported on the field by wheels 206.

[0026] 3, a seedling supply table 188 is provided between each chair 187 and the seedling supply device 38. The seedling supply table 188 is for placing the seedling trays of the seedling placement table 190. In addition, a spare seedling stand 280 for placing a container for accommodating seedling trays is provided above the rotary tiller 2. <Folding structure of multi-film end> As shown in Figures 4 and 5, a work machine 1 according to one embodiment of the present invention includes a tilling unit 18 that tills a field, and a furrow cutting member Z that cuts furrows to form ridges in the field tilled by the tilling unit 18. The tilling unit 18 has tilling tines 17 that rotate about a horizontal shaft (rotation shaft) 16, a rotary machine frame 11 that rotatably supports the horizontal shaft 16, and a rear cover 19B that is attached to the rotary machine frame 11 so as to be swingable in the vertical direction and covers the rear of the tilling tines 17. The furrow cutting member Z is attached to the rear cover 19B and can swing together with the rear cover 19B.

[0027] FIG. 4 is a rear perspective view of the rotary tiller 2. The rotary tiller 2 has a rotary machine frame 11. The rotary machine frame 11 has a transmission case 12, a front support frame 13F, a rear support frame 13R, a left side frame 15L, and a right side frame 15R. The transmission case 12 is located in the center of the width direction (the same direction as the machine width direction K2) of the rotary tiller 2. The front support frame 13F is disposed in front of the transmission case 12 and extends in the machine width direction K2. The rear support frame 13R is disposed behind the transmission case 12 and extends in the machine width direction K2. The front support frame 13F and the rear support frame 13R are connected to the transmission case 12. The left side frame 15L connects the left ends of the front support frame 13F and the rear support frame 13R to each other. The right side frame 15R connects the right ends of the front support frame 13F and the rear support frame 13R to each other.

[0028] A mounting portion 13R1 is provided at the center in the width direction of the rear support frame 13R. A central mounting body 196M (see FIGS. 7 and 10), which will be described later, is fixed to this mounting portion 13R1. As shown in Fig. 4, a rotary cover 19 is provided on the rotary machine frame 11. The rotary cover 19 has an upper cover 19A, a rear cover 19B, and a side cover 19C. The upper part of the tilling unit 18 is covered by the upper cover 19A. The rear part of the tilling unit 18 is covered by the rear cover 19B. The sides of the tilling unit 18 are covered by the side covers 19C.

[0029] The upper end of the rear cover 19B is pivotally supported on the rotary machine frame 11 via a pivot 19D so as to be rotatable about an axis in the machine width direction K2, and is free to swing up and down (see FIG. 5). The rear cover 19B is urged downward by a pair of left and right pressure devices 20. The pressure devices 20 are devices that urge the rear cover 19B downward with the force of a spring. The rear cover 19B moves up and down relative to the rotary machine frame 11 in response to the height (undulations) of the field surface. The rear cover 19B swings up and down relative to the rotary machine frame 11, and the lower end of the rear cover 19B always remains in contact with the ground even if the tilling depth varies.

[0030] An attachment frame X is attached to the rear end of the rear cover 19B. The attachment frame X extends in the machine width direction K2. The attachment frame X is made of a long material, and its length is approximately the same as the length of the rear cover 19B in the machine width direction K2. Both ends of the attachment frame X are attached to the rear end of the rear cover 19B via end brackets X1, and the middle part is attached to the rear end of the rear cover 19B via a middle bracket X2.

[0031] The irrigation tube guide KY is attached to the mounting frame X. The irrigation tube guide KY will be described later. A groove cutting member Z is attached to the mounting frame X. The groove cutting member Z is attached to the mounting frame X by a bracket W and a bolt W1. The groove cutting member Z is attached to the mounting frame X in a removable manner and such that its position in the machine width direction K2 can be freely adjusted (see the groove cutting member Z shown by the imaginary line and the arrow in FIG. 6).

[0032] The furrow cutting member Z cuts furrows and forms ridges UN (see FIG. 12) in the field that has been tilled by the tilling section 18. The furrow cutting member Z is a ridge forming device A for forming flat ridges UN (see FIG. 12) in the field. In this embodiment, the grooving member Z forms a first ridge UN1 and a second ridge UN2 as shown in Fig. 12. To form one ridge UN, at least a pair of left and right grooving members Z, Z are required. Therefore, the grooving member Z includes a pair of left and right grooving members Z, Z that form the groove of the first ridge UN1, and a pair of left and right grooving members Z, Z that form the second ridge UN2.

[0033] The groove cutting member Z is attached to the mounting frame X and is movable along the mounting frame X in a direction parallel to the horizontal axis (rotation axis) 16 (machine width direction), making it possible to change the width of the ridges UN formed by the groove cutting member Z. Also, by attaching multiple pairs of groove cutting members Z to the mounting frame X at intervals in a direction parallel to the horizontal axis 16, multiple ridges UN can be formed simultaneously.

[0034] As shown in Figures 4 to 6, the groove cutting member Z has a bottom plate Z1 which is rectangular in plan view and forms the bottom surface of the groove, a front plate Z2 which rises diagonally forward and upward from the front edge of the bottom plate Z1, a rear plate Z3 which rises upward from the rear edge of the bottom plate Z1, and a side plate Z4 which rises upward from the side edge of the bottom plate Z1. The bottom plate Z1 is a rectangular plate (flat plate) when viewed from above, so the bottom surface of the groove formed by the groove cutting member Z is flat. Because the front plate Z2 is inclined, there is less resistance when the groove cutting member Z moves (cuts the groove), and the movement allows the soil to be compacted downward. The rear plate Z3 prevents soil from entering the inside of the groove cutting member Z. Because the side plates Z4 rise perpendicular to the bottom plate Z1, the sides of the ridges formed by the side plates Z4 are vertical, and the width of the top surface of the ridges can be made wider than if the sides were inclined.

[0035] As shown in FIG. 5, the furrow cutting member Z swings up and down together with the rear cover 19B relative to the rotary machine frame 11, as shown by solid and imaginary lines. A horizontal shaft 16 is rotatably supported on the rotary machine frame 11, and a tilling section 18 for tilling the field is constituted by a tilling tine 17 provided on the horizontal shaft 16. Therefore, when the tilling depth by the tilling section 18 changes, the rotary machine frame 11 moves up and down relative to the surface of the field. On the other hand, the rear cover 19B covering the rear of the tilling tine 17 is attached to the rotary machine frame 11 so as to be able to swing up and down, so that even if the rotary machine frame 11 moves up and down, the rear cover 19B follows the field surface to form the surface of the ridge UN. Therefore, the furrow cutting member Z, which is attached to the rear cover 19B and can swing together with the rear cover 19B, can form a furrow at a constant depth from the field surface. Therefore, as shown in FIG. 12, the depth of the furrow cut by the furrow cutting member Z remains a constant depth from the surface of the ridge UN even if the tilling depth varies.

[0036] As shown in Fig. 5, the work machine 1 is equipped with a mulch film laying device 300 that lays a mulch film 300F on the ridges UN. The mulch film laying device 300 has a film pressing roller C that presses down the ends in the width direction of the laid mulch film 300F. The film pressing roller C rolls along the grooves cut by the groove cutting member Z to bend the ends.

[0037] As shown in FIG. 5, the mulch film laying device 300 has a mulch film laying section 300B on which a mulch film roll 300R is attached, a film pressing roller C that presses down the ends of the film 300F, and a soil gathering member D that covers the film 300F with soil. The mulch film laying section 300B has a roll support shaft 300J. A multi-film roll 300R is supported on the roll support shaft 300J. As shown in FIG. 6, the roll support shaft 300J includes a first roll support shaft 301 and a second roll support shaft 302. The multi-film roll 300R includes a first film roll 303 and a second film roll 304. A multi-film 300F pulled out from the multi-film roll 300R is placed over the ridges UN (see FIG. 12).

[0038] As shown in FIG. 5, the mulch-film laying section 300B, the film pressing rollers C, and the soil-gathering member D are provided on a mounting structure E. As shown in Figures 6 and 7, the mounting structure E includes a left mounting structure EL, a middle mounting structure EM, and a right mounting structure ER. The left mounting structure EL is provided on a mounting body 196 provided on the left side of the rotary machine frame 11 (see Figures 7, 8, and 9). The intermediate mounting structure EM is provided on a central mounting body 196M (see Figures 7, 10, and 11). The right mounting structure ER is attached to a mounting body 196 provided on the right side of the rotary machine frame 11 (see Figure 7).

[0039] The left and right mounting bodies 196 are disposed on both the left and right sides of the rotary tiller 2. The front parts of the left and right mounting bodies 196 are attached to the left and right side frames 15L, R of the rotary machine frame 11. The central mounting body 196M is fixed to the mounting portion 13R1 of the rear support frame 13R of the rotary machine frame 11 (see Figures 4 and 5). As shown in Figures 6 and 7, the film pressing rollers C of the mulch film laying device 300 include a left film pressing roller 331, a center left film pressing roller 332, a center right film pressing roller 333, and a right film pressing roller 334. These film pressing rollers C are composed of wheels, for example. These pressing rollers C may be called "first pressing rollers" to distinguish them from the high ridge pressing rollers described below.

[0040] The left film pressure roller 331 is supported by the left mounting structure EL on the left side, the centre left film pressure roller 332 and the centre right film pressure roller 333 are supported by the intermediate mounting structure EM, and the right film pressure roller 334 is supported by the right mounting structure ER on the right side. As shown in FIG. 12, each film pressing roller C is attached to a mounting structure E such that its position in the machine width direction can be adjusted so that it is positioned within a groove MZ formed by a groove cutting member Z.

[0041] The left film holding roller 331 and the center left film holding roller 332 are provided on an incline that transitions toward the first ridge UN1 as they move forward. The center right film holding roller 333 and the right film holding roller 334 are provided on an incline that transitions toward the second ridge UN2 as they move forward. The left film pressing roller 331 and the center left film pressing roller 332 are disposed behind the first film roll 303. The left film pressing roller 331 and the center left film pressing roller 332 press down both ends of the multi-film F1 laid on the first ridge UN1.

[0042] The center right film holding roller 333 and the right film holding roller 334 are disposed behind the second film roll 304. The center right film holding roller 333 and the right film holding roller 334 hold down both ends of the multi-film F2 laid on the second ridge UN2. As shown in Figures 6 and 7, the soil piling member D of the mulch-film laying device 300 has soil covering members DS, which include a left soil covering member 321, a center left soil covering member 322, a center right soil covering member 323, and a right soil covering member 324. The soil covering members DS are composed of circular soil covering disks. These soil covering members DS may be referred to as "first soil covering members" to distinguish them from soil covering members for high ridges, which will be described later.

[0043] The left soil covering member 321 is provided on the left mounting structure EL on the left side (see Figures 6 to 9). The center left soil covering member 322 and the center right soil covering member 323 are provided on the intermediate mounting structure EM (see Figures 6, 7, 10 and 11). The right soil covering member 324 is provided on the right mounting structure ER on the right side (see Figures 6 and 7). 12, the left soil covering member 321 and the center left soil covering member 322 are inclined so that they approach each other (moving toward the first ridge UN1) as they move toward the rear. The center right soil covering member 323 and the right soil covering member 324 are inclined so that they approach each other (moving toward the second ridge UN2) as they move toward the rear.

[0044] The left soil covering member 321 is disposed behind the left portion of the first film roll 303. The left soil covering member 321 covers with soil TU the left end portion of the mulch film 300F1 that has been unwound from the first film roll 303 and laid in the first ridge UN1. The center left soil covering member 322 is disposed behind the right portion of the first film roll 303. The center left soil covering member 322 covers with soil TU the right end portion of the mulch film 300F1 that has been unwound from the first film roll 303 and laid in the first ridge UN1.

[0045] The center right soil covering member 323 is disposed behind the left portion of the second film roll 304. The center right soil covering member 323 covers with soil TU the left end portion of the mulch film 300F2 that has been unwound from the second film roll 304 and laid in the second ridge UN2. The right soil covering member 324 is disposed behind the right portion of the second film roll 304. The right soil covering member 324 covers with soil TU the right end portion of the mulch film 300F2 that has been unwound from the second film roll 304 and laid in the second ridge UN2.

[0046] As explained above, the mulch film laying device 300 has a film pressing roller C that presses down the widthwise ends of the laid mulch film 300F, and the film pressing roller C rolls along the grooves MZ cut by the groove cutting member Z to bend the widthwise ends of the mulch film 300F. Therefore, the ends of the mulch film 300F laid on the ridges UN are folded by the film pressing roller C and positioned within the grooves MZ.

[0047] In addition, the mulch film laying device 300 has a soil covering member DS that covers the ends of the mulch film F folded by the film pressing roller C, so that the ends of the mulch film F are held down by the soil covered by the soil covering member DS. Therefore, the mulch film F will not peel off due to wind, etc. As shown in Figs. 6 and 7, the soil gathering member D of the mulch film laying device 300 has blades BL. The blades BL include a first blade BL1, a second blade BL2, a third blade BL3, and a fourth blade BL4. Each of the blades BL1 to BL4 is composed of a flat plate-like body. The lower edges of the blades BL are formed in a straight line. The lower edges of the blades BL are disposed parallel to the ground. This allows the soil to be leveled by moving the blades BL.

[0048] The first blade BL1 is provided on the left mounting structure EL on the left side (see Figures 8 and 9), the second blade BL2 and the third blade BL3 are provided on the intermediate mounting structure EM (see Figures 10 and 11), and the fourth blade BL4 is provided on the right mounting structure ER on the right side. As shown in Fig. 12, the blades BL1-BL4 are disposed behind the soil covering members 321-324 and guide the soil that has been covered on the ends of the mulch film F by the soil covering members 321-324 onto the mulch film F that covers the upper surface of the ridges UN. In Fig. 12, the arrow YT indicates the direction in which the soil moves.

[0049] As shown in Figures 4, 7 and 9, the work machine 1 is equipped with a planting device 39 that plants seedlings in ridges UN on which a mulch film 300F is laid, an irrigation tube KY1 that supplies water to the seedlings planted by the planting device 39, and an irrigation tube guide KY that supports the irrigation tube KY1. The irrigation tube guide KY is attached to a mounting frame X. As shown in Figure 4, a pair of irrigation tube guides KY are provided on the left and right sides of the mounting frame X of the rear cover 19B. The position of the irrigation tube guide KY in the machine width direction can be adjusted along the mounting frame X.

[0050] As shown in Figures 7 and 9, an irrigation tube KY1 is supported by an irrigation tube guide KY. The irrigation tube KY1 delivers water from a water tank (not shown) mounted on the traveling body 1A or the like to the vicinity of the planting tool 64 of the planting device 39 of the transplanter 3 via an irrigation pump (not shown), and an end of the irrigation tube KY1 is located near the planting tool 64. This allows water to be stably supplied to the seedlings from the irrigation tube KY1. In other words, since the mounting frame X is attached to the rear cover 19B that follows the surface of the field, the irrigation tube guide KY attached to the mounting frame X also follows the surface of the field, and the irrigation tube KY1 supported by the irrigation tube guide KY has good ability to follow the field surface, so water is stably supplied to the seedlings planted in the field.

[0051] <Explanation of the combined flat and high ridge structure> The work machine 1 shown in Figures 1 to 12 cuts furrows in a field to form flat ridges UN. The work machine 1 shown in Figures 13 to 19 stands ridges in a field to form high ridges UNH. The work machine 1 according to one embodiment of the present invention is designed to be used for both flat ridges UN and high ridges UNH. Hereinafter, flat ridges UN and high ridges UNH may be collectively referred to as ridges UN.

[0052] <Structure for flat ridges> The work machine 1 for creating flat ridges shown in Figures 1 to 12 comprises a tilling section 18 that rotates about an axis 16 extending in the width direction of the machine to till the field, a ridge forming device A that forms ridges UN in the field tilled by the tilling section 18, a mulch film laying section 300B that lays a mulch film 300F on the ridges UN, and a soil piling member D that piles soil on the mulch film F. In the case of the work machine 1 for creating flat ridges, the ridge forming device A is a furrow cutting member Z that cuts furrows in the field to form the flat ridges UN.

[0053] The soil gathering member D has a soil covering member DS that covers the end of the mulch film 300F with soil, and a blade BL that is arranged inside the soil covering member DS in the machine width direction and guides the soil covering the end onto the mulch film 300F that covers the upper surface of the ridge UN. The blade BL is arranged at an angle to the soil covering member DS in a plan view and extends toward the inside in the machine width direction K2. The blade BL is configured separately from the soil covering member DS.

[0054] The mulch film laying unit 300B lays a mulch film 300F on the ridges UN. The soil gathering member D has a soil covering member DS and a blade BL. The soil covering member DS covers the end of the mulch film 300F with soil. The blade BL guides the soil covered on the end onto the mulch film F that covers the top surface of the ridges UN. As shown in FIGS. 6 and 7, the multi-film laying section 300B has a roll support shaft 300J, and the roll support shaft 300J includes a first roll support shaft 301 and a second roll support shaft 302.

[0055] The first roll support shaft 301 supports a first film roll 303 wound with a mulch film 300F1 to be laid in the first ridge UN1. The second roll support shaft 302 supports a second film roll 304 wound with a mulch film 300F2 to be laid in the second ridge UN2. In other words, the mulch film roll 300R supported by the roll support shaft 300J includes the first film roll 303 and the second film roll 304.

[0056] The first roll support shaft 301 and the second roll support shaft 302 are provided to extend in the width direction (machine width direction K2) of the tractor 1A. The shaft centers of the first roll support shaft 301 and the second roll support shaft 302 are arranged to be aligned in the width direction (machine width direction K2) of the tractor 1A. The end portion of the first roll support shaft 301 on the inner side of the machine width and the end portion of the second roll support shaft 302 on the inner side of the machine width are supported by an intermediate mounting structure EM (see Figs. 10 and 11). The left end portion (end portion on the outer side of the machine width) of the first roll support shaft 301 is supported by the left mounting structure EL on the left side (see Figs. 8 and 9).

[0057] As shown in Figures 8, 9 and 12, the soil piling member D that piles soil onto the mulch film 300F has a left soil covering member 321, which is a soil covering member DS that covers the end of the mulch film 300F with soil, and a first blade BL1, which is a blade BL that guides soil onto the mulch film 300F. The blade BL1 is arranged at an incline relative to the soil covering member 321 in a plan view and extends inward in the machine width direction. The inner end of the soil covering member 321 in the machine width direction K2 and the outer end of the blade BL1 in the machine width direction coincide or overlap in the machine width direction. The soil covering member 321 is arranged at an incline in a plan view so as to move inward in the machine width direction K2 as it moves rearward. The soil covering member 321 is attached to the mounting structure E via an angle adjustment mechanism EL8 that can adjust the angle of inclination of the soil covering member 321.

[0058] In this embodiment, the blade BL1 is configured separately from the soil covering member 321, but the blade BL1 may be configured integrally with the soil covering member 321. The central part shown in Figs. 10 and 11, and the right side (not shown) are substantially the same as the left side in Figs. 8 and 9, and therefore description thereof will be omitted. <High ridge structure> The work machine 1 shown in Figures 13 to 19 is for forming high ridges by erecting ridges in a farm field. That is, the work machine 1 shown in Figures 13 to 19 is a work machine for forming high ridges.

[0059] The working machine 1 is equipped with a tilling section 18 that rotates around an axis extending in the width direction of the machine to till the field, a ridge forming device A that forms ridges UN in the field tilled by the tilling section 18, a mulch film laying section 300B that lays a mulch film 300F on the high ridges UNH, and a soil piling member D that piles soil on the mulch film 300F. The soil gathering member D has a soil covering member DS that covers the end portion of the mulch film 300F with soil.

[0060] The ridge forming device A has a ridge erector 51 that erects ridges in a field to form high ridges. In the case of a work machine 1 for high ridges, the ridge forming device A is a ridge erector 51 that erects ridges in a field (forms high ridges UNH). 13 and 14, the ridger 51 is, for example, a ridger. The ridger 51 has a shape whose width (length in the machine width direction) increases from the front to the rear in a plan view.

[0061] As shown in Figure 19, the ridge builders 51 include a first ridge builder 51M in the center, a second ridge builder 51L on the left, and a third ridge builder 51R on the right. Therefore, two ridges UNH1, UNH2 can be formed by forming furrows with the three ridge builders in the soil tilled by the rotary tiller 2. The upper surface of the high ridge UNH is formed by the rear cover 19B. It is also possible to provide four or more ridge builders 51 to form three or more ridges.

[0062] The second ridge creator 51L is disposed on one side (left side) in the width direction of the rotary tiller 2. The third ridge creator 51R is disposed on the other side (right side) in the width direction of the rotary tiller 2. The first ridge creator 51M is disposed in the center of the rotary tiller 2 in the width direction. The second ridge creator 51L forms the left side of the left ridge UNH1 of the two ridges UNH1, UNH2. The third ridge creator 51R forms the right side of the right ridge UNH2 of the two ridges UNH1, UNH2. The first ridge creator 51M forms the right side of the left ridge UNH1 and the left side of the right ridge UNH2.

[0063] The second ridge builder 51L is provided on the left mounting structure EL. The third ridge builder 51R is provided on the right mounting structure ER. The first ridge builder 51M is provided on the middle mounting structure EM. As shown in Figures 13, 14 and 19, the mulch film laying section 300B has a roll support shaft 300J. A multi-film roll 300R is supported on the roll support shaft 300J. The roll support shaft 300J includes a first roll support shaft 301 and a second roll support shaft 302. The multi-film roll 300R includes a first film roll 303 supported by the first roll support shaft 301 and a second film roll 304 supported by the second roll support shaft 302. A multi-film 300F pulled out from the multi-film roll 300R is placed over the high ridge UNH.

[0064] The first roll support shaft 301 and the second roll support shaft 302 extend in the width direction (machine width direction K2) of the tractor 1A. As shown in Fig. 19, the first roll support shaft 301 and the second roll support shaft 302 overlap in the width direction (machine width direction K2) of the tractor 1A. In other words, a portion 301a on the inner side of the machine width of the first roll support shaft 301 overlaps with a portion 302a on the inner side of the machine width of the second roll support shaft 302 in the machine width direction K2.

[0065] The right end (the end on the inner side of the machine width) of the first roll support shaft 301 is located to the right of the center in the machine width direction K2 of the mulch-film laying device 300. In addition, the right end of the first roll support shaft 301 is located to the right of the left end of the second roll support shaft 302 and the left end of the second film roll 304. The left end (the end on the inner side of the machine width) of the second roll support shaft 302 is located to the left of the center in the machine width direction K2 of the mulch-film laying device 300. In addition, the left end of the second roll support shaft 302 is located to the left of the right end of the first roll support shaft 301 and the right end of the first film roll 303.

[0066] 14, the first roll support shaft 301 and the second roll support shaft 302 are arranged to be shifted in the front-rear direction K1. As a result, the first film roll 303 and the second film roll 304 are arranged to be shifted in the front-rear direction K1. In the case of this embodiment, the first roll support shaft 301 is arranged in front of the second roll support shaft 302. However, the first roll support shaft 301 may be arranged behind the second roll support shaft 302. Although not shown, the first roll support shaft 301 and the second roll support shaft 302 may also be arranged to be shifted in the up-down direction.

[0067] The left end of the first roll support shaft 301 is supported by the left mounting structure EL. The right end of the first roll support shaft 301 is supported by the intermediate mounting structure EM. The left end of the second roll support shaft 302 is supported by the intermediate mounting structure EM. The right end of the second roll support shaft 302 is supported by the right mounting structure ER. 13 and 14, the film holding rollers C of the mulch film laying device 300 include a high ridge left film holding roller 331H, a high ridge middle left film holding roller 332H, a high ridge middle right film holding roller 333H, and a high ridge right film holding roller 334H. These film holding rollers C are composed of wheels, for example.

[0068] The high ridge left film holding roller 331H is supported by the left mounting structure EL. The high ridge middle left film holding roller 332H and the high ridge middle right film holding roller 333H are supported by the intermediate mounting structure EM. The high ridge right film holding roller 334H is supported by the right mounting structure ER. The high ridge pressure roller C may be called a "second pressure roller" to distinguish it from the "first pressure roller" for the flat ridges.

[0069] As shown in FIG. 19, each film pressing roller C is attached to a mounting structure E so that its position can be adjusted in the machine width direction so that it is positioned within a groove MZ formed by a ridge forming tool 51. The high ridge left film holding roller 331H and the high ridge middle left film holding roller 332H are provided at an incline so as to approach each other (shifting toward the first ridge UNH1) as they move forward. The high ridge middle right film holding roller 333H and the high ridge right film holding roller 334H are provided at an incline so as to approach each other (shifting toward the second ridge UNH2) as they move forward.

[0070] The high ridge left film holding roller 331H and the high ridge middle left film holding roller 332H are disposed behind the first film roll 303. The high ridge left film holding roller 331H and the high ridge middle left film holding roller 332H hold down both ends of the mulch film 300F1 laid on the first ridge UNH1. The high ridge middle right film holding roller 333H and the high ridge right film holding roller 334H are disposed behind the second film roll 304. The high ridge middle right film holding roller 333H and the high ridge right film holding roller 334H hold down both ends of the mulch film 300F2 laid on the second ridge UNH2.

[0071] The high ridge middle left film holding roller 332H and the high ridge middle right film holding roller 333H are arranged with a shift in the front-rear direction K1. In this embodiment, the high ridge middle left film holding roller 332H is arranged in front of the high ridge middle right film holding roller 333H. However, it is sufficient that either one of the high ridge middle left film holding roller 332H and the high ridge middle right film holding roller 333H is arranged behind the other film holding roller. Which of the high ridge middle left film holding roller 332H and the high ridge middle right film holding roller 333H is arranged behind can be determined by the front-rear relationship between the first roll support shaft 301 and the second roll support shaft 302.

[0072] As shown in Fig. 19, the soil piling member D has soil covering members DS. The soil covering members DS include a high ridge left soil covering member 321H, a high ridge middle left soil covering member 322H, a high ridge middle right soil covering member 323H, and a high ridge right soil covering member 324H. The soil covering members DS are composed of a circular soil covering disk. In addition, these high ridge soil covering members DS are sometimes called "second soil covering members" to distinguish them from the "first soil covering members" for the flat ridges.

[0073] The high ridge left soil covering member 321H and the high ridge middle left soil covering member 322H are inclined so that they approach each other toward the rear (moving toward the first ridge UNH1 side). The high ridge middle right soil covering member 323H and the high ridge right soil covering member 324H are inclined so that they approach each other toward the rear (moving toward the second ridge UNH2 side). The left soil covering member for high ridges 321H is disposed behind the left part of the first film roll 303. The left soil covering member for high ridges 321H covers with soil the left end part of the mulch film 300F1 that has been unwound from the first film roll 303 and laid on the first ridge UNH1. The middle left soil covering member for high ridges 322H is disposed behind the right part of the first film roll 303. The middle left soil covering member for high ridges 322H covers with soil the right end part of the first ridge UNH1 of the mulch film 300F1 that has been unwound from the first film roll 303 and laid on the first ridge UNH1.

[0074] The high ridge middle right soil covering member 323H is disposed behind the left part of the second film roll 304. The high ridge middle right soil covering member 323H covers with soil the left end part of the mulch film 300F2 that has been unwound from the second film roll 304 and laid on the second ridge UNH2. The high ridge right soil covering member 324H is disposed behind the right part of the second film roll 304. The high ridge right soil covering member 324H covers with soil the right end part of the mulch film 300F2 that has been unwound from the second film roll 304 and laid on the second ridge UNH2.

[0075] The high ridge middle left soil covering member 322H and the high ridge middle right soil covering member 323H are arranged offset in the front-to-rear direction K1. In this embodiment, the high ridge middle left soil covering member 322H is arranged in front of the high ridge middle right soil covering member 323H. However, it is sufficient that either the high ridge middle left soil covering member 322H or the high ridge middle right soil covering member 323H is arranged behind the other soil covering member. Which of the high ridge middle left soil covering member 322H and the high ridge middle right soil covering member 323H is arranged behind can be determined by the front-to-rear relationship between the first roll support shaft 301 and the second roll support shaft 302. Specifically, when the second roll support shaft 302 is disposed rearward of the first roll support shaft 301, the high ridge middle right soil covering member 323H is disposed rearward of the high ridge middle left soil covering member 322H. When the first roll support shaft 301 is disposed rearward of the second roll support shaft 302, the high ridge middle left soil covering member 322H is disposed rearward of the high ridge middle right soil covering member 323H.

[0076] The high ridge middle left soil covering member 322H and the high ridge middle right soil covering member 323H are arranged to overlap in the width direction (machine width direction K2) of the tractor 1A (see FIG. 18). The high ridge middle left soil covering member 322H and the high ridge middle right soil covering member 323H also overlap in the front-rear direction K1. In FIG. 19, the direction of soil movement is indicated by arrow YT.

[0077] As shown in Fig. 15, the left high ridge soil covering member 321H is attached to the left mounting structure EL. As shown in Fig. 17, the middle left high ridge soil covering member 322H and the middle right high ridge soil covering member 323H are attached to the intermediate mounting structure EM. As shown in Fig. 14, the right high ridge soil covering member 324H is attached to the right mounting structure ER. A working machine 1 according to one embodiment of the present invention can function as both a flat ridge working machine shown in FIG. 12 etc. and a high ridge working machine shown in FIG. 19 etc. in one unit.

[0078] That is, the ridge forming device A of the working machine 1 includes a furrow cutting member Z that cuts furrows in the field to form flat ridges UN, and a ridge erector 51 that erects ridges in the field to form high ridges UNH. The working machine 1 is equipped with a mounting structure E to which a flat ridge member used together with the furrow cutting member Z and a high ridge member used together with the ridge erector 51 can be selectively attached. 20 to 22 show a "mounting structure E" for use in both flat ridges and high ridges with a single work machine 1. This "mounting structure E" includes a "left mounting structure EL", a "middle mounting structure EM", and a "right mounting structure ER".

[0079] By attaching a "flat ridge member" to this mounting structure E and using a furrow cutting member Z, a flat ridge working machine 1 for forming flat ridges UN is configured (see Figure 12, etc.). Also, by attaching a "high ridge member" to the mounting structure E instead of the flat ridge member and using a ridge erector 51 instead of the furrow cutting member Z, a high ridge working machine 1 for forming high ridges UNH is configured (see Figure 19, etc.).

[0080] 12 and other figures, the "flat ridge members" include "first soil covering members" that are soil covering members DS that cover the widthwise ends of the mulch film 300F laid on the flat ridge UN with soil. The "first soil covering members" include a left soil covering member 321, a center left soil covering member 322, a center right soil covering member 323, and a right soil covering member 324. The "flat ridge member" includes a "first film holding roller" which is a film holding roller C that holds down the widthwise end of the mulch film 300F laid on the flat ridge UN. The "first film holding roller" includes a left film holding roller 331, a center left film holding roller 332, a center right film holding roller 333, and a right film holding roller 334.

[0081] The "flat ridge member" includes a blade BL. The blade BL guides the soil covered on the ends by the soil covering member DS onto the mulch film 300F that covers the upper surface of the ridge UN. The blade BL is disposed at an angle to the soil covering member DS in a plan view and extends toward the inside in the machine width direction K2. The blade BL is configured separately from or integrally with the soil covering member DS. 19 and other figures, the "high ridge members" include "second soil covering members" which are soil covering members DS that cover the widthwise ends of the mulch film 300F laid on the high ridge UNH with soil. The "second soil covering members" include high ridge left soil covering member 321H, high ridge middle left soil covering member 322H, high ridge middle right soil covering member 323H, and high ridge right soil covering member 324H.

[0082] The "high ridge member" includes a "second film holding roller" which is a film holding roller C that holds down the widthwise end of the mulch film 300F laid on the high ridge UNH. The "second film holding roller" includes a high ridge left film holding roller 331H, a high ridge middle left film holding roller 332H, a high ridge middle right film holding roller 333H, and a high ridge right film holding roller 334H.

[0083] As shown in Figures 20 and 21, the "left mounting structure EL" which is the mounting structure E has a base EL1 which is fixed to a mounting body 196 of the rotary machine frame 11. The base EL1 has a horizontal part EL1H which is attached to the mounting body 196, and a vertical part EL1V which hangs down from the center of the horizontal part EL1H, and is formed into a T-shape. A ridge builder 51 (51L) can be attached to the vertical part EL1V (see Figure 13).

[0084] An attachment arm EL2 protrudes rearward from the vertical portion EL1V. The attachment arm EL2 is attached to a bracket EL1a provided on the vertical portion EL1V via a pivot shaft EL1b so as to be able to swing up and down. The vertical portion EL1V and the attachment arm EL2 are connected by a tension spring EL3, and the attachment arm EL2 is biased downward. An attachment block EL4 and an attachment plate EL5 are attached to the tip of the attachment arm EL2. A chain attachment portion EL6 is provided on the upper surface of the attachment block EL4. A multi-film roll support portion EL7 protrudes outward in the machine width direction from the vertical portion EL1V.

[0085] The mounting plate EL5 has a first mounting portion EL21 to which the first soil covering member "left soil covering member 321" can be attached. The mounting block EL4 has a second mounting portion EL22 to which the second soil covering member "high ridge left soil covering member 321H" can be attached. The base side of the mounting arm EL2 has a third mounting portion EL23 to which the first film holding roller "left film holding roller 331" can be attached. The mounting plate EL5 has a fourth mounting portion EL24 to which the second film holding roller "high ridge left film holding roller 331H" can be attached. The mounting block EL4 has a fifth mounting portion EL25 to which the blade BL "first blade BL1" can be attached.

[0086] As shown in Figs. 8 and 9, a "left soil covering member 321" which is a first soil covering member is attached to the "first mounting portion EL21" via an angle adjustment mechanism EL8. The angle adjustment mechanism EL8 has an arm EL8b that is attached to the mounting plate EL5 via a support shaft EL8a so as to be rotatable in a horizontal plane. An oblong hole EL8c is formed in the arm EL8b with the support shaft EL8a at its center, and the rotation angle of the arm EL8b can be adjusted by loosening a bolt EL8d inserted into the oblong hole EL8c. A left soil cover member 321 is attached to the tip of the arm EL8b.

[0087] As shown in Figs. 15 and 16, a "left soil covering member 321H" which is a second soil covering member is attached to the "second mounting portion EL22" via a second soil covering member mounting arm EL4a. That is, the base of the second soil cover member mounting arm EL4a is fixed to the mounting block EL4, a plate portion EL4b is provided at the tip of the second soil cover member mounting arm EL4a, and the left soil cover member 321H is attached to the plate portion EL4b via an angle adjustment mechanism EL8. This angle adjustment mechanism EL8 is the same as that shown in Fig. 8, so a description thereof will be omitted.

[0088] As shown in FIGS. 8 and 9, a "left film pressing roller 331" which is a first film pressing roller is attached to the "third mounting portion EL23" via a roller mounting bar EL9. That is, a roller mounting bar EL9 is attached to the third mounting portion EL23 so as to protrude inward in the machine width direction, and a slider EL9a is attached to the roller mounting bar EL9 so as to be movable in the machine width direction. An L-shaped roller mounting arm EL9b is attached to the slider EL9a so as to be able to swing up and down, and a left film pressure roller 331 is attached to the lower end of the roller mounting arm EL9b. A tension spring EL9c is provided between the roller mounting arm EL9b and the slider EL9a, and the left film pressure roller 331 is biased in the direction toward the ground. The slider EL9a is fixed to the roller mounting bar EL9 by a lock bolt EL9d, and its position in the machine width direction can be adjusted.

[0089] As shown in FIGS. 15 and 16, a "left film pressing roller 331H", which is the second film pressing roller, is attached to the "fourth mounting portion EL24" via a roller mounting bar EL9. That is, the roller mounting bar EL9 is attached to the fourth mounting portion EL24 so as to protrude inward in the machine width direction, and the slider EL9a is provided on the roller mounting bar EL9 so as to be movable in the machine width direction. The other configurations are the same as those in FIG.

[0090] As shown in Figs. 8 and 9, a "first blade BL1" which is a blade BL, is attached to the "fifth attachment portion EL25" via a blade attachment arm EL4c. That is, the base of an L-shaped blade mounting arm EL4c is fixed to the mounting block EL4. An attachment part EL4d is provided at the tip of the blade mounting arm EL4c, and a plate-shaped first blade BL1 is fixed to the attachment part EL4d by an attachment bolt EL4e. An earth retaining plate PL is provided on the upper part of the first blade BL1, on the left soil covering member 321 side of the blade mounting arm EL4c, to prevent soil from going over the first blade BL1. Similarly, an earth retaining plate PL is provided on the upper part of the fourth blade BL4, on the right soil covering member 324 side of the blade mounting arm, to prevent soil from going over the fourth blade BL4.

[0091] The "right mounting structure ER", which is the mounting structure E, has a bilaterally symmetrical structure with the "left mounting structure EL", so its description will be omitted. FIG. 22 is a perspective view of the mounting structure E, the "intermediate mounting structure EM." The intermediate mounting structure EM has a vertical part EM1. The vertical part EM1 is attached to a central mounting body 196M (see Figures 7, 10, 11, 14, 17, and 18). A ridge builder 51 (51M) can be attached to the vertical part EM1 (see Figure 18). A mounting arm EM2 is provided on the vertical part EM1 so as to protrude rearward.

[0092] The mounting arm EM2 is composed of a pair of upper and lower parallel links. The base sides of the parallel links are attached to a bracket EM1a provided on the vertical section EM1 via a pivot shaft EM1b so as to be able to swing up and down. A bracket EM3 is provided at the tip of the parallel links, and the pair of upper and lower parallel links are connected via a pivot shaft EM3a provided on the bracket EM3. A tension spring EM4 is interposed between the pair of upper and lower parallel links. A chain mounting part EM5 is provided on the top surface of the tip of the upper parallel link. A multi-film roll support part EM6 is provided at the bottom of the vertical section EM1 to protrude toward both sides in the machine width direction.

[0093] A first mounting portion EM21, a second mounting portion EM22, a fourth mounting portion EM24, and a fifth mounting portion EM25 are provided on the underside of the bracket EM3, and a third mounting portion EM23 is provided on the upper surface of the base side of the lower parallel link. As shown in Figs. 10 and 11, a center left soil covering member 322 and a center right soil covering member 323, which are first soil covering members, are attached to the "first mounting portion EM21".

[0094] That is, a first mounting plate EM7 is attached to the underside of the bracket EM3, a center left soil covering member 322 is provided on the left side of the first mounting plate EM7, and a center right soil covering member 323 is provided on the right side. As shown in Figures 17 and 18, second soil covering members, a high ridge middle left soil covering member 322H and a high ridge middle right soil covering member 323H, are attached to the "second mounting part EM22" via a second mounting plate EM8.

[0095] That is, a plate-shaped second mounting plate EM8 is attached to the underside of bracket EM3, a stay EM8a hangs down from the rear end of second mounting plate EM8, a middle left soil covering member for high ridges 322H is provided on the left side of the lower part of stay EM8a, and a middle right soil covering member for high ridges 323H is provided on the right side of that (see FIG. 18). The middle left soil covering member for high ridges 322H is positioned forward of the middle right soil covering member for high ridges 323H in a plan view.

[0096] As shown in Figures 10 and 11, the first film holding rollers, that is, center left film holding roller 332 and center right film holding roller 333, are attached to the "third mounting part EM23" via a roller mounting bar EM9. That is, the roller mounting bar EM9 is attached to the third mounting portion EM23 so as to protrude in both directions in the machine width direction. A slider EM9a is attached to each of the roller mounting bars EM9 on both sides so as to be movable in the machine width direction. An L-shaped roller mounting arm EM9b is attached to each slider EM9a so as to be swingable up and down, and a center left film pressure roller 332 is attached to the lower end of the left roller mounting arm EM9b, and a center right film pressure roller 333 is attached to the right roller mounting arm EM9b. A tension spring EM9c is provided between the roller mounting arm EM9b and the slider EM9a, and each roller 332, 333 is biased in the direction of contact with the ground. The slider EM9a is fixed to the roller mounting bar EM9 by a lock bolt EM9d, and its position in the machine width direction can be adjusted by loosening the lock bolt EM9d.

[0097] 17 and 18, the second film holding rollers, high ridge middle left film holding roller 332H and high ridge middle right film holding roller 333H, are attached via a roller mounting bar EM9 to the "fourth mounting portion EM24." The roller mounting bar EM9 is provided on the second mounting plate EM8 so as to protrude on both sides in the machine width direction. That is, the roller mounting bar EM9 is provided so as to protrude in the left-right direction from the lower surface of the tip side of the plate-shaped second mounting plate EM8 attached to the underside of the bracket EM3. The left roller mounting bar EM9 is located further forward than the right roller mounting bar EM9 in a plan view.

[0098] A slider EM9a is provided on each roller mounting bar EM9 so as to be movable in the machine width direction. An L-shaped roller mounting arm EM9b is provided on each slider EM9a so as to be swingable up and down, with a high ridge middle left film pressing roller 332H attached to the lower end of the left roller mounting arm EM9b, and a high ridge middle right film pressing roller 333H attached to the right roller mounting arm EM9b. A tension spring EM9c is provided between the roller mounting arm EM9b and the slider EM9a, and each roller 332H, 333H is biased in the direction of contact with the ground. The slider EM9a is fixed to the roller mounting bar EM9 by a lock bolt EM9d, and its position in the machine width direction can be adjusted by loosening the lock bolt EM9d.

[0099] As shown in Figs. 10 and 11, a "second blade BL2 and a third blade BL3", which are blades BL, are attached to the "fifth attachment portion EM25" via a blade attachment member EM10. That is, a blade mounting member EM10 is provided on a first mounting plate EM7 attached to the underside of a bracket EM3. The blade mounting member EM10 has a vertical portion EM10a and a horizontal portion EM10b provided at the lower end of the vertical portion. The horizontal portion EM10b extends in the machine width direction. The second blade BL2 and the third blade BL3 are fixed to the horizontal portion EM10b by bolts EM10c.

[0100] The second blade BL2 is disposed behind the center left soil covering member 322. The widthwise inward side (left side) of the second blade BL2 overlaps with the center left soil covering member 322 in the widthwise direction. The third blade BL3 is disposed behind the center right soil covering member 323. The widthwise inward side (right side) of the third blade BL3 overlaps with the center right soil covering member 323 in the widthwise direction.

[0101] The second blade BL2 and the third blade BL3 are arranged on the same straight line extending in the aircraft width direction, but may be arranged so as to incline rearward as they move from the aircraft width inner side to the aircraft width outer side. In the working machine 1 according to one embodiment of the present invention described above, the ridge forming device A includes a furrow cutting member Z that cuts furrows in the field to form flat ridges UN, and a ridge erector 51 that erects ridges in the field to form high ridges UNH. The device is equipped with a mounting structure E to which a flat ridge member used together with the furrow cutting member Z and a high ridge member used together with the ridge erector 51 can be selectively attached, so that a single working machine can be used for both flat ridges and high ridges.

[0102] <Blade arrangement for flat ridges> As shown in FIG. 12, a work machine 1 according to one embodiment of the present invention has a structure in which a mulch film 300F is covered with soil to prevent the mulch film 300F from being peeled off by wind or the like. The working machine 1 shown in Figures 5 to 12 is equipped with a ridge forming device A that forms ridges UN in a farm field, a mulch film laying device 300 that lays a mulch film 300F on the ridges UN, and a planting device 39 that plants seedlings in the ridges UN on which the mulch film 300F has been laid.

[0103] The mulch film laying device 300 has a soil covering member DS that covers the ends of the mulch film 300F with soil, and a blade BL that is positioned forward of the planting device 39 and guides the soil that has been covered at the ends by the soil covering member DS onto the mulch film 300F that covers the upper surface of the ridges UN. As shown in FIG. 7, the blades BL (BL1 to BL4) are positioned forward of the planting device 39, so that before the planting device 39 plants the seedlings NE in the ridges UN, soil is placed on top of the mulch film 300F and the soil is leveled by the blades BL. Holes for planting are made in the mulch film 300F by the planting device 39, but when the wind blows, the wind enters through the holes and there is a risk that the mulch film 300F will peel off from the top surface of the ridges UN. However, in this embodiment, soil is placed on top of the mulch film 300F before the planting holes are made, so the mulch film 300F will not peel off due to the wind.

[0104] The ridge forming device A shown in Figures 4 and 5 is a furrow cutting member Z that cuts furrows to form ridges UN in a field that has been tilled by the tilling unit 18. The furrow cutting member Z is attached to a rear cover 19B that moves up and down following the field surface, so that even if the tilling depth by the tilling unit 18 fluctuates, the depth of the furrows formed by the furrow cutting member Z will be constant from the surface of the ridges UN. As shown in Fig. 12, the soil covering member DS is disposed behind the ditch cutting member Z. The blade BL is disposed behind the soil covering member DS. With this configuration, the soil covering member DS can efficiently cover the end of the mulch film 300F located on the groove formed by the ditch cutting member Z. In addition, the blade BL can guide the soil at the end onto the mulch film 300F covering the top surface of the ridge.

[0105] In the present invention, "rear" means "rear in terms of the positional relationship in the front-to-rear direction," and also includes being shifted in the left-to-right direction. Furthermore, "rear" at least means being rearward when comparing the positions of the centers in the front-to-rear direction. For example, it is sufficient that the center of the blade BL in the front-to-rear direction is located rearward of the center of the soil covering member DS in the front-to-rear direction. Furthermore, it is sufficient that the front end of the soil covering member DS is located forward of the front end of the blade BL.

[0106] In the above configuration, the soil covering member DS and the blade BL are formed separately, but as described above, the soil covering member DS and the blade BL may be formed integrally. In addition, the left-right positional relationship between the soil covering member DS and the ditch cutting member Z can be adjusted (changed) by changing the position of the ditch cutting member Z and / or the mounting structure E in the machine width direction (left-right direction). The positional relationship between the trench cutting member Z, the soil covering member DS and the blade BL will be explained in more detail.

[0107] As shown in Figs. 10 to 12, the soil covering members DS attached to the intermediate mounting structure EM are a center left soil covering member 322 and a center right soil covering member 323, and the blades BL are a second blade BL2 and a third blade BL3. On the left side of the intermediate mounting structure EM, a center left film holding roller 332 is disposed behind the groove cutting member Z so as to be located within the groove MZ cut by the groove cutting member Z. A center left soil covering member 322 is disposed behind the center left film holding roller 332, and a second blade BL2 is disposed further behind it. The front end of the center left soil covering member 322 is located inside the machine body relative to the groove MZ, and the rear end is located within the groove MZ. The right end of the second blade BL2 is positioned so as to overlap with the center left soil covering member 322 in the machine width direction. The left end of the second blade BL2 reaches the planting position of the seedlings NE on the upper surface of the first ridge UN1.

[0108] The center left film pressing roller 332 folds and presses the end of the mulch film 300F1 laid on the first ridge UN1 so that it fits along the side of the first ridge UN1 formed by the groove cutting member Z. The center left soil covering member 322 arranged behind the center left film pressing roller 332 covers the end of the folded mulch film 300F1 with soil TU between the grooves and also covers the shoulder of the first ridge UN1. The second blade BL2 arranged behind the center left soil covering member 322 moves above the mulch film 300F1, guiding the soil covering the shoulder of the first ridge UN1 to the top surface of the first ridge UN1 and covering it on the top surface of the mulch film 300F1, as shown by the arrow YT in FIG. 12.

[0109] The center right film holding roller 333, center right soil covering member 323, and third blade BL3 provided on the right side of the intermediate mounting structure EM are arranged symmetrically with the center left film holding roller 332, center left soil covering member 322, and second blade BL2 across the center of the transplanter in the machine width direction. Therefore, they have the same structure (positional relationship) and action (function) as the left film holding roller 332, center left soil covering member 322, and second blade BL2.

[0110] 8 and 9, the left film pressing roller 331 is arranged so as to be located within the groove MZ formed by the groove cutting member Z (see FIG. 12). The left soil covering member 321 is arranged on the outer side (left side) of the groove MZ. The outer end (left end) of the first blade BL1 is positioned so as to overlap in the width direction with the inner end (right end) of the left soil covering member 321. The inner end (right end) of the first blade BL1 reaches the planting position of the seedlings NE on the top surface of the first ridge UN1.

[0111] The left film pressing roller 331 folds and presses the end of the mulch film 300F1 laid on the first ridge UN1 so that it fits along the side of the first ridge UN1 formed by the groove cutting member Z. The left soil covering member 321 arranged behind the left film pressing roller 331 covers the end of the folded mulch film 300F1 with soil TU between the grooves and also covers the shoulder of the first ridge UN1. The first blade BL1 arranged behind the left soil covering member 321 moves above the mulch film 300F1, guiding the soil covering the shoulder of the first ridge UN1 to the top surface of the first ridge UN1 and covering it on the top surface of the mulch film 300F1, as shown by the arrow YT in FIG. 12.

[0112] The right film holding roller 334, the right soil covering member 324, and the fourth blade BL4 attached to the right mounting structure ER are disposed symmetrically with the left film holding roller 331, the left soil covering member 321, and the first blade BL1 across the center of the transplanter in the machine width direction. Therefore, they have the same arrangement (positional relationship) and action (function) as the left film holding roller 331, the left soil covering member 321, and the first blade BL1.

[0113] <Multi-film mounting structure> As shown in FIGS. 23 to 29, the work machine 1 has a structure that makes it easy to attach and detach the multi-film roll. As shown in Figures 5, 6, 12 and 23, the multi-film laying device 300 has a roll support shaft 300J that is penetrated by a film roll 300R around which a multi-film 300F is wound and supports the film roll 300R over its entire length, one support part J1 that supports one end side of the roll support shaft 300J, and the other support part J2 that supports the other end side of the roll support shaft 300J.

[0114] 23 and 24, one end of the roll support shaft 300J (outside the machine body) is detachable from one support part J1, and the other end (inside the machine body) is swingable about the other support part J2. In more detail, the other end of the roll support shaft 300J is swingable in the up-down direction about the other support part J2. 12 and 23, the roll support shaft 300J includes a first roll support shaft 301 that supports the mulch film 300F1 attached to the first rib UN1, and a second roll support shaft 302 that supports the mulch film 300F2 attached to the second rib UN2 adjacent to the first rib UN1. The first roll support shaft 301 and the second roll support shaft 302 can swing independently.

[0115] 23, the one-side support part J1 includes a first one-side support part J1a that supports one end side of the first roll support shaft 301 and a second one-side support part J1b that supports one end side of the second roll support shaft 302. The other-side support part J2 includes a first other-side support part J2a that supports the other end side of the first roll support shaft 301 and a second other-side support part J2b that supports the other end side of the second roll support shaft 302.

[0116] 12, the first other-side support portion J2a supports the other end of the first roll support shaft 301 between the first ridge UN1 and the second ridge UN2. The second other-side support portion J2b supports the other end of the second roll support shaft 302 between the first ridge UN1 and the second ridge UN2. As indicated by an arrow Y2 in FIGS. 25 and 26, the one support part J1 and the other support part J2 are movable parallel to the axial direction of the roll support shaft 300J.

[0117] 27 to 29, the roll support shaft 300J is formed in a cylindrical shape. The other support part J2 has a support rod J3 that is inserted into the other end of the roll support shaft 300J to support the other end, a through shaft J3a that passes through the support rod J3, and a holding member J3b that holds the roll support shaft 300J rotatably around the axis of the through shaft J3a. The other support part J2 has a locking member J4 that is movably arranged along the roll support shaft 300J and is movable between an allowable position that allows the roll support shaft 300J to rotate and a locked position that does not allow the roll support shaft 300J to rotate.

[0118] Let me explain in more detail. As shown in Figures 24 and 26, the first one-side support part J1a supports one end side of the first roll support shaft 301. The first one-side support part J1a is provided on the left mounting structure EL. A multi-film roll support part EL7 is provided on the vertical part EL1V of the left mounting structure EL. The first one-side support part J1a is provided on the multi-film roll support part EL7.

[0119] The first one-side support portion J1a has a slider EL7a slidably mounted on the multi-film roll support portion EL7 and an arm EL7b attached to the slider EL7a. The slider EL7a is fixed to the multi-film roll support portion EL7 by a lock bolt EL7c, and is positioned in the left-right direction. An upwardly opening recess EL7d is provided at the tip of the arm EL7b to support one end of the first roll support shaft 301. A lid member EL7e is provided to prevent the first roll support shaft 301 from coming off upward from the recess EL7d. One end of the lid member EL7e is rotatably attached to the tip of the arm EL7b by a pivot EL7f. The other end of the lid member EL7e is rotatably fixed to the tip of the arm EL7b by a lock bolt EL7g.

[0120] By loosening the lock bolt EL7g and opening the lid member EL7e upward, it can be freely attached to and detached from the recess EL7d on one end side of the first roll support shaft 301 (see arrow Y3 in FIG. 26). As shown in Fig. 23, the second one-side support part J1b supports one end side of the second roll support shaft 302. The second one-side support part J1b is provided on the right mounting structure ER. The second one-side support part J1b is symmetrical to the first one-side support part J1a across the center CL1 of the transplanter in the machine width direction. The configuration of the second one-side support part J1b is the same as the configuration of the first one-side support part J1a.

[0121] As shown in Figures 24, 25, and 27 to 29, the first other-side support part J2a supports the other end side of the first roll support shaft 301. The first other-side support part J2a is provided on the intermediate mounting structure EM. A multi-film roll support part EM6 is provided on the vertical part EM1 of the intermediate mounting structure EM. The first other-side support part J2a is provided on the multi-film roll support part EM6.

[0122] The first other support portion J2a has a slider EM6a slidably mounted on the multi-film roll support portion EM6 and an arm EM6b attached to the slider EM6a. The slider EM6a is fixed to the multi-film roll support portion EM6 by a lock bolt EM6c, and is positioned in the left-right direction. 27 to 29, the first roll support shaft 301 is formed in a cylindrical shape. The first other support part J2a has a support rod J3 at the tip of an arm EM6b, a penetrating shaft J3a penetrating the support rod J3, and a holding member J3b that holds the first roll support shaft 301 rotatably around the axis of the penetrating shaft J3a.

[0123] That is, the support rod J3 has an axis extending in the machine width direction K2 and is fixed to the tip of the arm EM6b. The penetrating shaft J3a has an axis extending in the front-rear direction K1 and penetrates the support rod J3 so that both ends thereof protrude from the support rod J3. The front and rear ends of the through shaft J3a are inserted into holes formed in a cylindrical first roll support shaft 301, and support the first roll support shaft 301 on the support rod J3 so as to be rotatable up and down.

[0124] The holding member J3b is formed in a semicircular ring shape, one end of which is provided to be able to swing on one end of the through shaft J3a, and the other end of which is detachably engaged with the other end of the through shaft J3a. A ring groove J3c is formed on the outer circumferential surface of the first roll support shaft 301 to accommodate the holding member J3b and prevent it from protruding from the outer circumferential surface of the first roll support shaft 301. The other end of the first roll support shaft 301 can be attached to and detached from the support rod J3 by releasing the engagement between the holding member J3b and the through shaft J3a and removing the through shaft J3a from the support rod J3. The other end of the first roll support shaft 301 can be attached to the support rod J3 by inserting the other end of the first roll support shaft 301 into the support rod J3, inserting the through shaft J3a between the first roll support shaft 301 and the support rod J3, and holding it with the holding member J3b. In the state where the other end of the first roll support shaft 301 is attached to the support rod J3, the first roll support shaft 301 can be rotated (inclined) in the vertical direction around the axis of the through shaft J3a (see the imaginary lines in Figures 23 and 24). This configuration makes it easy to attach and remove the multi-film roll 300R, which is a heavy object, to and from the film roll support shaft 300J.

[0125] 25, 27, and 29, the first other-side support portion J2a has a locking member J4. The locking member J4 is disposed movably along the first roll support shaft 301, and is movable between an allowable position (see FIG. 29(a)) that allows the first roll support shaft 301 to rotate about the through shaft J3a and a locked position (see FIG. 29(b)) that does not allow the first roll support shaft 301 to rotate about the through shaft J3a.

[0126] The locking member J4 is formed in a cylindrical body that is slidably fitted onto the other end of the first roll support shaft 301. A lock bolt J4a is screwed into the locking member J4. An operation piece J4b is provided on the locking bolt J4a. By pinching the operation piece J4b and rotating the locking bolt J4a, it is possible to switch between a state in which the locking member J4 is fixed to the first roll support shaft 301 and a state in which the locking member J4 is movable along the first roll support shaft 301.

[0127] As shown in (a) of FIG. 29, by loosening the lock bolt J4a and placing the lock member J4 in a position where its end face is away from the arm EM6b, the first roll support shaft 301 can be tilted downward around the through axis J3a, as shown by the imaginary line. As shown in (b) of FIG. 29, the locking member J4 is placed in a position where its end face contacts the arm EM6b, and the locking bolt J4a is tightened to fix the locking member J4 to the first roll support shaft 301. As a result, the first roll support shaft 301 is prevented from tilting due to the contact between the end face of the locking member J4 and the arm EM6b.

[0128] The configuration of the second other support portion J2b that supports the other end side of the second roll support shaft 302 is the same as the configuration of the first other support portion J2a described above. The high ridge working machine shown in Figs. 13 to 19 also has the above-mentioned one support part J1 and the other support part J2. <Structure of the ridger> As shown in Figs. 19 and 30 to 35, a work machine 1 according to one embodiment of the present invention has a structure that allows a sufficient amount of soil to be placed on the mulch film 300F.

[0129] As shown in Figures 13, 14 and 19, the working machine 1 comprises a tilling section 18 that tills the field, a ridge erector 51 that erects and forms ridges UN in the field tilled by the tilling section 18, a mulch film laying section 300B that lays a mulch film 300F on the ridges UN formed by the ridge erector 51, and a soil piling member D that piles soil on the mulch film 300F laid by the mulch film laying section 300B.

[0130] As shown in Figures 14 and 19, the ridge erector 51 includes a first ridge erector 51M that forms the slope on one side of the first ridge UN1 and the slope on one side of the second ridge UN2 that are adjacent to each other across the first ridge UN1, a second ridge erector 51L that forms the slope on the other side of the first ridge UN1, and a third ridge erector 51R that forms the slope on the other side of the second ridge UN2. 13 to 16, the second ridge forming tool 51L is disposed on one side (left side) in the width direction of the rotary tiller 2. The second ridge forming tool 51L forms the left side surface of the left ridge of the two ridges.

[0131] The second ridge creator 51L has mounting portions 51La, 51Lb that are attached to the rotary tiller 2. The mounting portions 51La, 51Lb include a front mounting portion 51La provided at the front of the second ridge creator 51L and a rear mounting portion 51Lb provided at the rear of the second ridge creator 51L. The front mounting portion 51La of the second ridge former 51L is provided at the front end of the second ridge former 51L and is attached to the first side cover 19CL via the front mounting body 52. ​​The front portion of the front mounting body 52 is attached to the outer surface (the surface on the outer side of the machine width) of the first side cover 19CL. The front mounting body 52 is bent so as to move toward the outer side of the machine width as it moves toward the rear. The front mounting portion 51La of the second ridge former 51L is attached to the rear portion of the front mounting body 52. ​​The vertical position of the front mounting portion 51La relative to the front mounting body 52 can be adjusted.

[0132] The rear mounting portion 51Lb of the second ridge builder 51L is attached to the left mounting structure EL via the side connector 53. The rear mounting portion 51Lb of the second ridge builder 51L protrudes rearward from the second ridge builder 51L. The side connector 53 extends in the vertical direction, with its lower end connected to the rear mounting portion 51Lb of the second ridge builder 51L and its upper end connected to the vertical portion EL1V of the left mounting structure EL. The length of the side connector 53 can be adjusted by moving it in and out of the vertical portion EL1V. The height of the second ridge builder 51L can be adjusted by adjusting the length of the side connector 53.

[0133] The mounting structure of the front mounting portion 51Ra and the rear mounting portion 51Rb of the third ridge former 51R is similar to the mounting structure of the front mounting portion 51La and the rear mounting portion 51Lb of the second ridge former 51L, so a description thereof will be omitted. As shown in Fig. 14, the outer ends (ends on the outer side of the machine width) of the second and third ridge creators 51L, 51R in the width direction of the rotary tiller 2 are positioned outside of the outer end (end on the outer side of the machine width) of the side cover 19C in the width direction of the rotary tiller 2. Specifically, the left end of the second ridge creator 51L is positioned to the left of the left end of the first side cover 19CL. The right end of the third ridge creator 51R is positioned to the right of the right end of the second side cover 19CR.

[0134] As shown in Figures 14, 17 to 19, the first ridger 51M is disposed in the center in the width direction of the rotary tiller 2. A front mounting part 51Ma (see Figure 30) of the first ridger 51M is attached to the lower part of the transmission case 12 via an intermediate mounting body (not shown) so that the height can be freely adjusted. The rear mounting portion 51Mb (see FIG. 30) of the first ridge creator 51M extends vertically from the rear of the first ridge creator 51M, with its upper end connected to the vertical portion EM1 of the intermediate mounting structure EM. The length of the rear mounting portion 51Mb can be adjusted by moving it in and out of the vertical portion EM1. By adjusting the length of the rear mounting portion 51Mb, the height of the first ridge creator 51M can be adjusted.

[0135] As shown in Figures 30 to 33, the ridge erector 51 has a bottom plate 51a that forms the bottom surface between the ridges, a side plate 51b that rises obliquely upward from the side edge of the bottom plate 51a and forms the slope of the ridge UN, and a vertical plate 51c disposed on the side of the side plate 51b. A space 51d is formed between the vertical plate 51c and the side plate 51b. As shown in Figure 33, the width (length in the machine width direction) of the space 51d increases as it goes downward.

[0136] Hereinafter, the term "side plate" will be used as a concept including the side plate 51b and the vertical plate 51c. The side plate may be the side plate 51b, may be the vertical plate 51c, or may be both the side plate 51b and the vertical plate 51c. In this embodiment, the side plate has the side plate 51b and the vertical plate 51c. The first ridge forming tool 51M has a bottom plate 51a that forms the bottom surface of the first ridge UM1 (see FIG. 19). The side plate 51b includes a first side plate 51b1 that rises obliquely upward from one side edge of the bottom plate 51a to form a slope on one side of the first ridge UNH1, and a second side plate 51b2 that rises obliquely upward from the other side edge of the bottom plate 51a to form a slope on one side of the second ridge UNH2. The vertical plate 51c includes a first vertical plate 51c1 arranged on one side of the first side plate 51b1, and a second vertical plate 51c2 arranged on the other side of the second side plate 51b2. The upper edge of the first side plate 51b1 and the upper edge of the second side plate 51b2 are connected by an upper plate 51j.

[0137] 31 and 32, the ridge forming tool 51 (first ridge forming tool 51M) has a pair of side plates spaced apart from each other, and a space SP with an open lower side is formed between the pair of side plates. The space SP may be formed between the pair of side plates 51b, 51b, or may be formed between the pair of vertical plates 51c (first vertical plate 51c1 and second vertical plate 51c2). In this embodiment, the first ridge forming tool 51M has a pair of side plates 51b, 51b spaced apart from each other, and a space SP that is open downward is formed between the pair of side plates 51b, 51b. The space SP is open downward because a bottom plate 51a is not provided below. The upper part of the space SP is also open. The space SP is open upward because a top plate 51j is not provided above. The space SP that is open downward and upward is formed because the pair of side plates 51b, 51b extend rearward beyond the bottom plate 51a and the top plate 51j. The space SP is also open rearward.

[0138] 33, a space 51d is formed between the first vertical plate 51c1 and the first side plate 51b1, and between the second vertical plate 51c2 and the second side plate 51b2. The vertical plate 51c extends downward from the midpoint of the side plate 51b in the height direction. The vertical plate 51c may be extended so as to protrude further rearward than the side plate 51b. In this case, the lower part of the side surface of the ridge can be scraped off by the vertical plate 51c, and a large amount of soil can be stored in the space 51d.

[0139] The first ridge forming device 51M has a first extension plate 51e1 extending rearward from the first vertical plate 51c1, and a second extension plate 51e2 extending rearward from the second vertical plate 51c2. The first extension plate 51e1 and the second extension plate 51e2 extend in directions approaching each other toward the rear. The rear end of the first extension plate 51e1 is disposed rearward of the rear end of the second extension plate 51e2.

[0140] The first extension plate 51e1 is disposed at a distance from the first vertical plate 51c1 behind the first vertical plate 51c1. The second extension plate 51e2 is disposed at a distance from the second vertical plate 51c2 behind the second vertical plate 51c2. An arm 51f is fixed to the inner surface of the first vertical plate 51c1 and the second vertical plate 51c2. A rod 51g is fixed to the inner surface of the first extension plate 51e1 and the second extension plate 51e2. The rod 51g is inserted into the arm 51f so that its position can be freely adjusted. A lock bolt 51h that fixes the rod 51g to the arm 51f is screwed into the arm 51f.

[0141] As shown in Figures 5 to 12, the soil gathering member D has a soil covering member DS that covers the ends of the mulch film 300F laid by the mulch film laying unit 300B with soil, and a blade BL that guides the soil that has been covered on the ends by the soil covering member DS onto the mulch film 300F that covers the upper surface of the ridges UN. This blade BL may be applied to the high ridge working machine shown in Figures 13 to 19.

[0142] As described above, the working machine 1 comprises a tilling section 18 that tills the field, a ridge erector 51 that erects and forms ridges UN in the field tilled by the tilling section 18, a mulch film laying section 300B that lays a mulch film 300F on the ridges UN formed by the ridge erector 51, and a soil piling member D that piles soil onto the mulch film 300F laid by the mulch film laying section 300B, and the ridge erector 51 has a pair of side plates (side plates 51b, 51b or vertical plate 51c1 and a second vertical plate 51c2) that are spaced apart from each other, and a space SP that is open downward is formed between the pair of side plates.

[0143] This allows the soil to be piled up and left in the space SP. Therefore, the soil piling member D prevents a shortage of soil to cover the mulch film 300F, and a sufficient amount of soil can be placed on the mulch film 300F. That is, in the past, when the ridges UN were formed by the ridge builder 51 and then the mulch film 300F was covered with soil by the soil-collecting member D, there were cases where the amount of soil to be covered by the soil-collecting member D was insufficient. In particular, behind the central ridge builder 51M, the soil had to be distributed and covered on both the left and right ridges, so the amount of soil was likely to be insufficient. In this embodiment, the soil can be piled up and left in the space SP, so that the soil to be covered by the soil-collecting member D does not run out. Therefore, a sufficient amount of soil can be covered on the mulch film 300F. In addition, since the soil can be left in the space 51d, a sufficient amount of soil can be piled up on the mulch film 300F by the soil-collecting member D.

[0144] In addition, if a sufficient amount of soil can be left in the space 51d, a configuration may be adopted in which the space SP with an open downward portion is not formed between the pair of side plates 51b, 51b. For example, if the vertical plate 51c is extended so as to protrude rearward beyond the side plate 51b, instead of forming the space SP with an open downward portion between the pair of side plates 51b, 51b, a configuration may be adopted in which the space SP with an open downward portion is formed between the first vertical plate 51c1 and the second vertical plate 51c2.

[0145] Moreover, the second ridge forming device 51L and the third ridge forming device 51R may have the same configuration as the first ridge forming device 51M. 34 and 35 are diagrams showing another embodiment (hereinafter referred to as the second embodiment) of the ridge former 51. This ridge former 51 is suitably used as a first ridge former 51M. Hereinafter, the ridge forming tool 51 according to the second embodiment will be described, focusing on the differences from the ridge forming tool 51 (see Figures 30 to 33) of the embodiment described above (hereinafter referred to as the first embodiment), and a description of the common configuration will be omitted.

[0146] The ridge forming tool 51 (first ridge forming tool 51M) has a pair of side plates 51b, 51b spaced apart from each other, and a space SP with an open downwards is formed between the pair of side plates 51b, 51b. The space SP is open downwards because a bottom plate 51a is not provided below. The ridge forming tool 51 does not have a bottom plate 51a. Therefore, the space between the pair of side plates 51b, 51b is open downwards over the entire region from the front end to the rear end of the side plates 51b, 51b. In other words, the space SP with an open downwards is formed over the entire region from the front end to the rear end of the side plates 51b, 51b. Preferably, the space SP with an open downwards is formed over the entire region from the front end to the rear end of the ridge forming tool 51, but it is sufficient that the space SP with an open downwards is formed in at least a part of the entire region from the front end to the rear end of the ridge forming tool 51.

[0147] The top of the space SP is also open. The space SP is open at the top because there is no upper plate 51j provided at the top. The ridge creator 51 does not have an upper plate 51j. Therefore, the top is open over the entire area between the pair of side plates 51b, 51b from the front end to the rear end of the side plates 51b, 51b. In other words, the space SP with an open top is formed over the entire area from the front end to the rear end of the side plates 51b, 51b. Preferably, the space SP with an open top is formed over the entire area from the front end to the rear end of the ridge creator 51, but it is sufficient that it is formed in at least a part of the entire area from the front end to the rear end of the ridge creator 51.

[0148] The space SP, which is open downward and upward, is formed by the absence of the bottom plate 51a and the top plate 51j that connect the pair of side plates 51b, 51b. The space SP is also open at the rear. Each of the pair of side plates 51b, 51b has a vertical plate 51k that rises vertically from the ground and a diagonal plate 51m that extends diagonally upward from the upper edge of the vertical plate 51k. The diagonal plate 51m of one side plate 51b and the diagonal plate 51m of the other side plate 51b are gradually separated upward. The ridger 51 does not have a vertical plate 51c, and the vertical plate 51k is provided at a position corresponding to the vertical plate 51c.

[0149] A front extension 51n is provided at the front of the pair of side plates 51b, 51b, which approaches each other as it moves forward. A front mounting portion 51Ma is provided at the front end of the front extension 51n. The front extension 51n is formed with a notch 51p for taking in soil between the pair of side plates 51b, 51b. The notch 51p is formed by cutting out the lower part of the front extension 51n. The notch 51p is formed from the front end to the rear end of the front extension 51n, but may be formed in a part of the front extension 51n. The notch 51p is located in front of the vertical plate 51k. The notch 51p is in communication with the space SP.

[0150] The first extension plate 51e1 extends toward the rear of one of the pair of side plates 51b, 51b (first side plate 51b1). The second extension plate 51e2 extends toward the rear of the other of the pair of side plates 51b, 51b (second side plate 51b2). The first extension plate 51e1 and the second extension plate 51e2 extend in directions approaching each other toward the rear. The rear end of the first extension plate 51e1 is located rearward of the rear end of the second extension plate 51e2.

[0151] The first extension plate 51e1 is disposed at the rear of one side plate (first side plate 51b1) behind the first vertical plate 51c1 and at a distance from the one side plate (first side plate 51b1). The second extension plate 51e2 is disposed at the rear of the other side plate (second side plate 51b2) and at a distance from the other side plate (second side plate 51b2). As shown in Fig. 17, the film pressing roller 333H is disposed behind the first extension plate 51e1. The film pressing roller 332H is disposed behind the second extension plate 51e2. The first extension plate 51e1 and the film pressing roller 333H overlap in the machine width direction. The second extension plate 51e2 and the film pressing roller 332H overlap in the machine width direction.

[0152] This allows the first extension plate 51e1 and the second extension plate 51e2 to scrape off and remove the soil at the ridge bottom in front of the film pressing rollers 332H, 333H. Therefore, the end of the mulch film comes to the part where the ridge collapses, which prevents the end of the mulch film from being positioned at the ridge bottom, and the end of the mulch film can be reliably grounded at the ridge bottom.

[0153] According to the ridge creator 51 of the second embodiment (first ridge creator 51M), soil can be introduced between the pair of side plates 51b, 51b through the cutout 51p, so that a large amount of soil can be left in the space SP. In addition, because the space between the pair of side plates 51b, 51b is open at the bottom and top, a large amount of soil can be piled up and left in the space SP. Therefore, a sufficient amount of soil can be piled up on the mulch film 300F by the soil piling member D.

[0154] <Suspension structure of the mounting arm of the multi-film laying device> As shown in Fig. 2, the rotary cultivator 2 has a rotary machine frame 11, and the transplanter 3 has a transplanter frame 37. The rotary machine frame 11 and the transplanter frame 37 are connected to each other so as to be movable up and down by a connecting mechanism 41 consisting of a parallel link mechanism. This allows the rotary cultivator 2 and the transplanter 3 to move relative to each other in the vertical direction. In other words, the transplanter 3 (transplanter frame 37) is movable up and down relative to the rotary cultivator 2.

[0155] The front chairs 187A, B are mounted on the rotary machine frame 11 via a connecting mechanism 41 so as to be vertically movable. The rear chairs 187C, D are mounted on a seat frame 197 which is connected to the rotary machine frame 11 via a parallel link mechanism 200. The seat frame 197 is supported on the field by wheels 206. As shown in Figure 36, the mounting arm EL2 of the mulch-film laying device 300 is pivoted by a pivot shaft SZ to be vertically movable relative to the rotary frame 11. The same is true for the mounting arms ER2 and EM2. This mounting arm EL2 and the transplanter frame 37 are connected via a chain CHN. This chain CHN is connected to the chain attachment part EL6 shown in Figure 20 and the chain attachment part EM5 shown in Figure 22. As a result, as the transplanter frame 37 rises, the mulch-film laying device 300 also rises (see arrows Y4 and Y5 in Figure 36).

[0156] FIG. 37 is an explanatory diagram of the up and down movement of the connecting mechanism 41. The connecting mechanism 41 has a lower link 44A and an upper link 44C. A cylinder of the lifting drive device 42 is connected to the upper link 44C. When the lower link 44A swings up and down around the support shaft 161L by driving the lifting drive device 42, the upper link 44C swings up and down around the support shaft 161M. As a result, the chairs (first front chair 187A and second front chair 187B) supported by the chair support 150 and the transplanter 3 rise and fall together. Here, since the connecting link mechanism 44 is configured as a parallel link mechanism, the chairs 187A, 187B and the transplanter 3 rise and fall parallel to the ground.

[0157] The lifting drive device 42 has a lifting cylinder (hydraulic actuator) C1. The lifting cylinder C1 is composed of a hydraulic cylinder having a cylinder body C1a and a piston rod C1b. The tip of the piston rod C1b is pivoted to an upper support shaft 162. The upper support shaft 162 is attached to a midpoint in the front-rear direction of the upper link 44C. The bottom side of the cylinder body C1a is pivoted to a lower support shaft 163. The lower support shaft 163 is attached to the rotary machine frame 11.

[0158] When the lifting cylinder C1 is extended (the piston rod C1b is advanced from the cylinder body C1a), the upper link 44C and the lower link 44A swing upward, and the chairs (the first front chair 187A and the second front chair 187B) supported by the chair support 150 and the transplanter 3 (the machine frame 37) rise. When the lifting cylinder C1 is shortened (the piston rod C1b is retracted), the upper link 44C and the lower link 44A swing downward, and the chairs (the first front chair 187A and the second front chair 187B) supported by the chair support 150 and the transplanter 3 (the machine frame 37) fall. The lifting drive device 42 may be composed of an electric cylinder (electric actuator) or an electric hydraulic cylinder (electric hydraulic actuator).

[0159] The work machine 1 of this embodiment provides the following advantages. The working machine 1 comprises a tilling section 18 for tilling the field, and a furrow cutting member Z for cutting furrows in the field tilled by the tilling section 18 to form ridges UN. The tilling section 18 has tilling tines 17 which rotate around a horizontal shaft 16, a rotary machine frame 11 which rotatably supports the horizontal shaft 16, and a rear cover 19B which is attached to the rotary machine frame 11 so as to be swingable in the vertical direction and covers the rear of the tilling tines 17. The furrow cutting member Z is attached to the rear cover 19B and can swing together with the rear cover 19B.

[0160] According to this configuration, the furrow cutting member Z moves up and down together with the rear cover 19B in accordance with changes in the tilling depth. Because the rear cover 19B swings up and down relative to the rotary machine frame 11, the lower end of the rear cover 19B always stays in contact with the ground even if the tilling depth changes. Therefore, by the furrow cutting member Z swinging together with the rear cover 19B, the furrow depth remains constant even if the tilling depth changes.

[0161] Further, the groove cutting member Z is attached to a mounting frame X attached to the rear cover 19B, and is movable along the mounting frame X in a direction parallel to the horizontal shaft 16. According to this configuration, the width of the ridges UN formed by the groove cutting member Z can be easily changed. The system also includes a mulch film laying device 300 that lays a mulch film 300F on the ridges UN, and the mulch film laying device 300 has a film pressing roller C that presses the widthwise ends of the laid mulch film 300F, and the film pressing roller C rolls along the grooves cut by the groove cutting member Z to bend the ends.

[0162] According to this configuration, the film pressing roller C rolls along the grooves cut by the groove cutting member Z, so that the end of the mulch film 300F can be reliably folded and pressed down so as to fit along the side surface of the ridge UN. The mulch-film laying device 300 also has a soil covering member DS that covers the end of the mulch-film 300F folded by the film pressing roller C with soil.

[0163] According to this configuration, the soil covering member DS can cover the ends of the mulch film 300F with soil, preventing the mulch film 300F from being rolled up by the wind. It also includes a planting device 39 that plants seedlings in the furrows UN on which the mulch film 300F is laid, an irrigation tube KY1 that supplies water to the seedlings planted by the planting device 39, and an irrigation tube guide KY that supports the irrigation tube KY1, and the irrigation tube guide KY is attached to a mounting frame X.

[0164] According to this configuration, the mounting frame X is attached to the rear cover 19B and follows the field surface, so that the irrigation tube guide KY attached to the mounting frame X also follows the field surface, and the irrigation tube KY1 supported by the irrigation tube guide KY also follows the field surface, ensuring reliable water supply to the seedlings planted in the field. The groove cutting member Z also has a bottom plate Z1 which is rectangular in plan view and forms the bottom surface of the groove, a front plate Z2 which rises diagonally forward and upward from the front edge of the bottom plate Z1, a rear plate Z3 which rises upward from the rear edge of the bottom plate Z1, and a side plate Z4 which rises upward from the side edge of the bottom plate Z1.

[0165] According to this configuration, the bottom plate Z1 is a rectangular plate when viewed from above, so the bottom surface of the furrow is flat. Because the front plate Z2 is inclined, the tilled soil is compacted downward and the furrow cutting resistance is reduced. The rear plate Z3 prevents soil from entering the inside of the furrow cutting member Z. The side plates Z4 form the sides of the ridge, which are nearly vertical and can form a wide top surface of the ridge. The bottom of the furrow can be compacted.

[0166] The groove cutting member Z also includes a plurality of groove cutting members Z for forming a plurality of ridges UN, and the plurality of groove cutting members Z are mounted at intervals on the mounting frame X in a direction parallel to the horizontal axis 16. According to this configuration, the width of the multiple ridges UN can be easily changed. The work machine 1 also includes a tilling section 18 that rotates around an axis 16 extending in the width direction of the machine to till the field, a ridge forming device A that forms ridges UN in the field tilled by the tilling section 18, a mulch film laying section 300B that lays a mulch film 300F on the ridges UN, and a soil piling member D that piles soil onto the mulch film 300F, the soil piling member D having a soil covering member DS that covers the ends of the mulch film 300F with soil, and a blade BL that is positioned inward in the width direction of the machine from the soil covering member DS and guides the soil covered on the ends onto the mulch film 300F that covers the upper surface of the ridges UN, the blade BL being constructed separately from the soil covering member DS, and being positioned at an angle to the soil covering member DS in a plan view, extending toward the inside in the width direction of the machine.

[0167] According to this configuration, the soil gathered by the soil covering member DS can be guided onto the mulch film 300F by the blade BL, and the soil can be covered. In addition, the inner end portion in the machine width direction of the soil covering member DS and the outer end portion in the machine width direction of the blade BL coincide or overlap in the machine width direction. According to this configuration, the soil gathered by the soil covering member DS can be efficiently guided by the blade BL onto the mulch film 300F and covered with soil.

[0168] In addition, the soil covering member DS is arranged at an incline in a plan view so that it approaches inward in the width direction of the machine as it moves rearward. According to this configuration, the soil can be easily gathered by the soil covering member DS. It also has an angle adjustment mechanism EL8 that can adjust the angle of inclination of the soil covering member DS. This configuration allows the amount of soil to be adjusted.

[0169] In addition, the ridge forming device A includes a furrow cutting member Z that cuts furrows in the field to form flat ridges, and a ridge erector 51 that erects ridges in the field to form high ridges, and is equipped with a mounting structure E to which a flat ridge member used together with the furrow cutting member Z and a high ridge member used together with the ridge erector 51 can be selectively attached. According to this structure, by selectively attaching flat ridge members and high ridge members to the mounting structure E, a single work machine can be used for both flat ridges and high ridges.

[0170] In addition, the flat ridge member includes a first soil covering member for covering with soil the widthwise ends of the mulch film 300F laid on the flat ridge, and the high ridge member includes a second soil covering member for covering with soil the widthwise ends of the mulch film 300F laid on the high ridge, and the mounting structure E has a first mounting portion EL21 to which the first soil covering member can be attached, and a second mounting portion EL22 to which the second soil covering member can be attached.

[0171] According to this configuration, a first soil covering member that covers with soil the widthwise ends of the mulch film 300F laid on flat ridges, and a second soil covering member that covers with soil the widthwise ends of the mulch film 300F laid on high ridges can be selectively attached to a single work machine. In addition, the flat ridge member includes a first film holding roller that holds down the widthwise ends of the mulch film laid on the flat ridges, and the high ridge member includes a second film holding roller that holds down the widthwise ends of the mulch film laid on the high ridges, and the mounting structure E has a third mounting portion EL23 to which the first film holding roller can be attached, and a fourth mounting portion EL24 to which the second film holding roller can be attached.

[0172] With this configuration, a first film holding roller for holding down the widthwise ends of the mulch film laid on flat ridges, and a second film holding roller for holding down the widthwise ends of the mulch film laid on high ridges can be selectively attached to a single work machine. Further, the flat ridge member includes a blade BL, and the mounting structure E has a fifth mounting portion EL25 to which the blade BL can be attached.

[0173] According to this configuration, the blade BL, which is a flat ridge member, can be attached to the working machine as needed. The work machine 1 also includes a ridge forming device A that forms ridges UN in the field, a mulch film laying device 300 that lays a mulch film 300F on the ridges UN, and a planting device 39 that plants seedlings in the ridges UN on which the mulch film 300F has been laid.The mulch film laying device 300 has a soil covering member DS that covers the ends of the mulch film 300F with soil, and a blade BL that is positioned forward of the planting device 39 and guides the soil that has been covered on the ends by the soil covering member DS onto the mulch film 300F that covers the top surface of the ridges UN.

[0174] According to this configuration, the blade BL covers the mulch film 300F with soil before holes (planting holes) are made in the mulch film 300F by the planting device 39, so that the mulch film 300F can be prevented from being peeled off by strong winds, etc. In addition, the blade BL levels the soil on the mulch film 300F, so that the seedlings can be prevented from being buried in the soil.

[0175] The ridge forming device A also includes a tilling section 18 for tilling the field, and a furrow cutting member Z for cutting furrows in the field tilled by the tilling section 18 to form ridges UN. According to this configuration, after laying the mulch film 300F on the ridges UN (flat ridges) formed by cutting trenches in the field using the trench cutting member Z, soil is covered on the mulch film 300F using the soil covering member DS and the blade BL, thereby preventing the mulch film 300F from peeling off.

[0176] Further, the soil covering member DS is disposed behind the groove cutting member Z, and the blade BL is disposed behind the soil covering member DS. According to this configuration, after the ridges UN (flat ridges) are formed by the groove cutting member Z, soil can be piled up on the formed ridges UN (flat ridges) by the soil covering member DS, and the piled up soil can be covered on the mulch film 300F by the blade BL.

[0177] Further, the soil covering member DS is disposed at a position overlapping with the groove cutting member Z in the width direction of the mulch film 300F, and the blade BL extends from the end side toward the center side of the mulch film 300F. With this configuration, soil can be reliably piled onto the ridges UN (flat ridges) formed by the groove cutting member Z using the soil covering member DS, and the piled soil can be evenly covered from the end side of the mulch film 300F toward the center using the blade BL.

[0178] Moreover, the soil covering member DS and the blade BL are formed separately. According to this configuration, the soil covering member DS and the blade BL can be replaced individually during maintenance, etc. The positional relationship between the soil covering member DS and the blade BL can be adjusted. Moreover, the soil covering member DS and the blade BL are integrally formed. According to this configuration, the soil covering member DS and the blade BL can be attached and detached as a unit, and the positional relationship between the soil covering member DS and the blade BL can be fixed.

[0179] The work machine 1 also includes a mulch film laying device 300 that lays a mulch film 300F on ridges UN formed in the field. The mulch film laying device 300 has a roll support shaft 300J that is penetrated through a film roll 300R on which the mulch film 300F is wound and supports the film roll 300R over its entire length, one support part J1 that supports one end side of the roll support shaft 300J, and the other support part J2 that supports the other end side of the roll support shaft 300J. One end side of the roll support shaft 300J is detachable from the one support part J1, and the other end side is swingable around the other support part J2 as a fulcrum.

[0180] According to this configuration, the roll support shaft 300J swings, so that the multi-film roll 300R, which is a heavy object, can be easily attached to and detached from the roll support shaft 300J. The other end of the roll support shaft 300J can swing up and down with the other support part J2 as a fulcrum. According to this configuration, the roll support shaft 300J swings up and down, which makes it easy to attach and detach the multi-film roll 300R, which is a heavy object, to and from the roll support shaft 300J.

[0181] In addition, the roll support shaft 300J includes a first roll support shaft 301 that supports the multi-film 300F attached to the first ridge UN1, and a second roll support shaft 302 that supports the multi-film 300F attached to the second ridge UN2 adjacent to the first ridge UN1, and the first roll support shaft 3011 and the second roll support shaft 302 are capable of swinging independently. According to this configuration, the multi-film roll 300R can be easily attached to and detached from each of the support shafts 301 and 302 individually.

[0182] In addition, the one side support part J1 includes a first one side support part J1a that supports one end side of the first roll support shaft 301 and a second one side support part J1b that supports one end side of the second roll support shaft 302, and the other side support part J2 includes a first other side support part J2a that supports the other end side of the first roll support shaft 301 and a second other side support part J2b that supports the other end side of the second roll support shaft 302. According to this configuration, the multi-film roll 300R can be easily attached to and detached from each of the support shafts 301 and 302 individually.

[0183] In addition, the first other support portion J2a supports the other end side of the first roll support shaft 301 between the first ridge UN1 and the second ridge UN2, and the second other support portion J2b supports the other end side of the second roll support shaft 302 between the first ridge UN1 and the second ridge UN2. According to this configuration, the multi-film roll 300R can be attached and detached from both sides in the machine width direction, making it easy to attach and detach the multi-film roll 300R.

[0184] Moreover, the one support part J1 and the other support part J2 are movable parallel to the axial direction of the roll support shaft 300J. According to this configuration, the position and width of the multi-film roll 300R can be changed in accordance with the position and width of the ridges UN. In addition, the roll support shaft 300J is formed in a cylindrical shape, and the other support part J2 has a support rod J3 that is inserted into the other end side of the roll support shaft 300J to support the other end side, a through shaft J3a that passes through the support rod J3, and a holding member J3b that holds the roll support shaft 300J rotatably around the axis of the through shaft J3a.

[0185] According to this configuration, the roll support shaft 300J can be tilted easily and reliably. In addition, the other support part J2 has a locking member J4 that is movably arranged along the roll support shaft 300J and is movable between an allowable position that allows the roll support shaft 300J to rotate and a locked position that does not allow the roll support shaft 300J to rotate. According to this configuration, when tilting of the roll support shaft 300J is not necessary, it is possible to prevent the roll support shaft 300J from tilting.

[0186] The working machine 1 also comprises a tilling section 18 which tills the field, a ridge erector 51 which erects and forms ridges UN in the field tilled by the tilling section 18, a mulch film laying section 300B which lays a mulch film 300F on the ridges UN formed by the ridge erector 51, and a soil piling member D which piles soil onto the mulch film 300F laid by the mulch film laying section 300B, and the ridge erector 51 has a pair of side plates (side plates 51b, 51b or a vertical plate 51c1 and a second vertical plate 51c2) which are spaced apart from each other, and a space SP which is open downward is formed between the pair of side plates.

[0187] According to this configuration, the soil can be piled up and left in the space SP. Therefore, the soil piling member D prevents a shortage of soil to cover the mulch film 300F, and a sufficient amount of soil can be covered on the mulch film 300F. Conventionally, after forming ridges UN with the ridge creator 51, when soil is applied to the mulch film 300F using the soil piling member D, there are cases where there is not enough soil to cover it. In particular, behind the central ridge creator 51M, soil is easily insufficient because soil must be distributed and applied to both the left and right ridges. In this embodiment, soil can be piled up and left in the space SP, preventing the soil piling member D from running out of soil to cover the mulch film 300F.

[0188] In addition, the ridge builder 51 has a bottom plate 51a that forms the bottom surface between the ridges, and the side plates include a side plate 51b that rises diagonally upward from the side edge of the bottom plate 51a and a vertical plate 51c that is arranged to the side of the side plate 51b, and a space is formed between the vertical plate 51c and the side plate 51b. According to this configuration, the soil can be piled up and left in the space 51d between the vertical plate 51c and the side plate 51b, so that it is possible to prevent a situation in which the soil piling member D does not have enough soil to cover the mulch film 300F.

[0189] The ridge erector 51 further includes a first ridge erector 51M which forms the slope on one side of the first ridge UN1 and the slope on one side of the second ridge UN2 which are adjacent to each other across the first ridge space, a second ridge erector 51L which forms the slope on the other side of the first ridge UN1, and a third ridge erector 51R which forms the slope on the other side of the second ridge UN2. The first ridge erector 51M has a bottom plate 51a which forms the bottom surface between the first ridges UN1 and a side plate 51b which rises obliquely upward from one side edge of the bottom plate 51a and forms the slope on one side of the first ridge UN1. The vertical plate 51c includes a first side plate 51b1 which forms a slope, and a second side plate 51b2 which rises diagonally upward from the other side edge of the bottom plate 51a and forms a slope on one side of the second ridge UN2, and the vertical plate 51c includes a first vertical plate 51c1 which is arranged on one side of the first side plate 51b1, and a second vertical plate 51c2 which is arranged on the other side of the second side plate 51b2, and spaces 51d are formed between the first vertical plate 51c1 and the first side plate 51b1, and between the second vertical plate 51c2 and the second side plate 51b2.

[0190] According to this configuration, a large amount of soil can be piled up and left in the space 51d. The vertical plate 51c extends downward from the middle of the first side plate 51b1 in the height direction. This configuration ensures that the upper part of the side surface of the ridge UN is inclined, and the lower part of the side surface is vertical, ensuring that the end of the mulch film 300F is folded in. In addition, the vertical plate 51c is prevented from interfering with the creation of the ridges, while ensuring that the space 51d is secured and soil is left in the space 51d.

[0191] In addition, a front extension 51n is provided at the front of the pair of side panels (side panels 51b, 51b), which approaches each other as it moves forward, and a notch 51p is formed in the front extension 51n for introducing soil between the pair of side panels (side panels 51b, 51b). According to this configuration, soil can be introduced between the pair of side plates 51b, 51b through the cutout 51p, so that a large amount of soil can be left in the space SP.

[0192] In addition, a space SP that is open upward is formed between the pair of side plates (side plates 51b, 51b). According to this configuration, a large amount of soil can be piled up and left in the space SP. In addition, the first ridge builder 51M has a first extension plate 51e1 extending toward the rear of one of the pair of side plates (side plate 51b1 or first vertical plate 51c1) of the pair of side plates (side plates 51b, 51b or the first vertical plate 51c1 and the second vertical plate 51c2), and a second extension plate 51e2 extending toward the rear of the other of the pair of side plates (side plate 51b, 51b or the first vertical plate 51c1 and the second vertical plate 51c2), and the first extension plate 51e1 and the second extension plate 51e2 extend in directions approaching each other as they approach the rear.

[0193] According to this configuration, the soil stored in the space 51d can be moved to the center. In addition, the first extension plate 51e1 and the second extension plate 51e2 can scrape off the bottom of the ridges so that the soil can flow backward. Therefore, it is possible to prevent the edge of the mulch film from being positioned at the bottom of the ridges due to the mulch film coming to a place where the ridges have collapsed. Further, the rear end of the first extension plate 51e1 is disposed rearward of the rear end of the second extension plate 51e2.

[0194] According to this configuration, by positioning the soil piling member 323H arranged behind the first extension plate 51e1 rearward of the soil piling member 322H arranged behind the second extension plate 51e2, the amount of soil piling up by the soil piling member 323H and the amount of soil piling up by the soil piling member 322H can be equalized. In addition, the first extension plate 51e1 is positioned rearward of one of the side plates (side plate 51b1 or first vertical plate 51c1) at a distance from the one side plate, and the second extension plate 51e2 is positioned rearward of the other side plate (side plate 51b2 or second vertical plate 51c2) at a distance from the other side plate.

[0195] With this configuration, excess soil can escape from between the first extension plate 51e1 and one of the side plates and between the second extension plate 51e2 and the other side plate, allowing an appropriate amount of soil to be placed on the mulch film 300F. In addition, the soil-gathering member D has a soil covering member DS that covers the ends of the mulch film 300F laid by the mulch film laying section 300B with soil, and a blade BL that guides the soil covered on the ends by the soil covering member DS onto the mulch film 300F that covers the upper surface of the ridge UN.

[0196] According to this configuration, the blade BL can guide the soil onto the mulch film 300F. Although one embodiment of the present invention has been described above, the embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0197] 1 Work equipment 11 Rotary machine frame 16 Horizontal axis 17 Cultivating Claw 18 Cultivation Department 19B Rear cover 39 Planting equipment 300 Multi-film laying device 300F Multi Film C Film holding roller DS soil cover material KY Irrigation Tube Guide KY1 Irrigation tube UN ridge X Mounting Frame Z Grooving Parts Z1 bottom plate Z2 Front Panel Z3 Rear plate Z4 side plate

Claims

1. A tilling section for tilling the fields; A furrow cutting member that cuts a furrow in the field cultivated by the tilling unit to form a ridge; Equipped with The tilling unit includes a tilling claw that rotates around a horizontal shaft, a rotary machine frame that rotatably supports the horizontal shaft, and a rear cover that is attached to the rotary machine frame so as to be swingable in the vertical direction and covers the rear of the tilling claw. The furrow cutting member is a ridge forming device for forming flat ridges in a farm field, and is a work machine that is attached to the rear cover and can swing together with the rear cover.

2. 2. The work machine according to claim 1, wherein the groove cutting member is attached to a mounting frame attached to the rear cover and is movable along the mounting frame in a direction parallel to the horizontal axis.

3. A mulch film laying device is provided for laying a mulch film on the ridges, The mulch film laying device has a film pressing roller that presses the end of the laid mulch film in the width direction, 3. The work machine according to claim 1, wherein the film pressing roller rolls along the groove cut by the groove cutting member to bend the end portion.

4. 4. The work machine according to claim 3, wherein the mulch film laying device has a soil covering member for covering with soil the end of the mulch film folded by the film pressing roller.

5. A mulch film laying device for laying a mulch film on the ridges; A planting device that plants seedlings in the furrows on which the mulch film is laid; an irrigation tube for supplying water to the seedlings planted by the planting device; an irrigation tube guide for supporting the irrigation tube; Equipped with 3. The work machine according to claim 2, wherein the irrigation tube guide is attached to the mounting frame.

6. The working machine described in any one of claims 1 to 5, wherein the groove cutting member has a bottom plate consisting of a flat plate having a rectangular shape in a plan view that forms the bottom surface of the groove, a front plate that rises diagonally forward and upward from the front edge of the bottom plate, a rear plate that rises upward from the rear edge of the bottom plate, and side plates that rise vertically upward from the side edges of the bottom plate and form the sides of the ridges approximately vertically.

7. The groove cutting member includes a plurality of groove cutting members for forming a plurality of ridges, 6. A work machine according to claim 2 or 5, wherein the plurality of groove cutting members are attached to the mounting frame at intervals in a direction parallel to the horizontal axis.

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