Weeding device and ridge-forming machine

Abstract

To prevent weeds from getting entangled with a weeding device that is attached to a ridge-coating machine and that weeds an upper surface of an original ridge.SOLUTION: The weeding device is provided to the ridge-coating machine, which digs up soil while moving in a field along the original ridge, and which also tames and hardens the dug up soil to form a new ridge. The weeding device is provided with a blade that is formed of a plate material and that scrapes the soil on the upper surface of the original ridge prior to the formation of the new ridge.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a weeding device and a ridge forming machine that are provided on a ridge application machine. [Background technology]

[0002] A ridge forming machine disclosed in Patent Document 1 is known.

[0003] The ridge forming machine disclosed in Patent Document 1 has an embankment section that supplies soil in a mounded state to the ridge formation location, a forming section that presses the soil piled up in the embankment section to form it into a ridge, and a ridge top excavation section that excavates the top surface of the ridge (original ridge) before it is formed to remove weeds.

[0004] The ridge top excavation section is composed of top excavation claws arranged radially from an top excavation axis, which is a horizontal rotation axis positioned on the top of the ridge and perpendicular to the direction of travel, and tills the top surface of the base ridge. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-139976 Summary of the Invention [Problem to be solved by the invention]

[0006] In the ridge top excavation section disclosed in Patent Document 1, when tall weeds grow thickly on the top surface of the base ridge, the weeds cannot be completely crushed, and the cut weeds become entangled in the top excavation claws. These entangled weeds do not separate on their own and continue to accumulate. As the weeds accumulate, the top excavation claws become buried and are no longer able to be crushed. For this reason, it is necessary to remove entangled weeds using a sickle or other tool whenever they accumulate.

[0007] In view of the above problems, the present invention aims to prevent weeds from becoming entangled in a weeding device that weeds the top surface of a former ridge prior to the formation of a new ridge. [Means for solving the problem]

[0008] One aspect of the present invention is a weeding device that is attached to a ridge coating machine that moves through a field along an original ridge, digging up the soil and tamping the excavated soil to form a new ridge, and is equipped with a blade made of a board that scrapes the soil on the top surface of the original ridge prior to forming the new ridge.

[0009] The blade may have a cutting edge that scrapes the soil on the top surface of the base ridge by moving along the direction of travel of the ridge coating machine.

[0010] The cutting edge may be inclined with respect to the direction of travel.

[0011] The blade may be arranged at an angle that transitions in the opposite direction to the direction of travel of the ridge coating machine as it moves from the outside to the inside of the original ridge, and may be configured to guide the scraped soil to the inside of the original ridge.

[0012] The blade may be arranged at an angle that transitions in the opposite direction to the direction of travel of the ridge coating machine as it moves from the inside to the outside of the original ridge, and may be configured to guide the scraped soil to the outside of the original ridge.

[0013] The weeding device comprises a head portion including the blade, and a head portion support that supports the head portion and is attached to the frame of the furrow coating machine, and the head portion may be attached to the head portion support so that the cutting edge of the blade is inclined with respect to the direction of travel.

[0014] The head portion may have a blade support on which the blade is supported and a head portion attachment body attached to the head portion support, and the blade support may be attached to the head portion attachment body so that the inclination angle of the cutting edge of the blade relative to the direction of travel can be changed.

[0015] The blade may be supported on the blade support so as to be freely rotatable around a rotation axis, the blade support having an overload avoidance mechanism, the overload avoidance mechanism having a biasing member, and configured to restrict the rotation of the blade around the rotation axis by the biasing force of the biasing member, and to allow the blade to rotate around the rotation axis against the biasing force of the biasing member when an overload acts on the blade.

[0016] The head portion is attached to the blade and rotates around the rotation axis on the blade support. a blade attachment body rotatably supported on a support member, the blade attachment body having a holding portion, the overload avoidance mechanism having a ball that fits into the holding portion and a compression spring that is the biasing member that presses the ball against the holding portion, the ball fitting into the holding portion restricting rotation of the blade attachment body around the rotation axis, and when an overload is applied to the blade, the load that the ball receives from the holding portion compresses the compression spring and causes the ball to come off the holding portion, thereby allowing rotation of the blade attachment body around the rotation axis.

[0017] The overload avoidance mechanism may have a stopper provided on the blade support and a tension spring which is the biasing member that presses the blade against the stopper, and may be configured so that when the blade is pressed against the stopper, the rotation of the blade around the rotation axis is restricted, and when an overload is applied to the blade, the load received by the blade causes the blade to stretch the tension spring and move away from the stopper, thereby allowing the blade to rotate around the rotation axis.

[0018] The blade may be adjustable in height relative to the base ridge.

[0019] The head support may be attached to the machine frame so that its position can be adjusted in the vertical direction, and the height of the blade relative to the base ridge may be adjusted by adjusting the vertical position of the head support.

[0020] The head may be detachable from the head support and retainable on the machine frame.

[0021] A ridge forming machine according to one embodiment of the present invention comprises a ridge coating machine that moves through a field along an original ridge, digging up soil and tamping the excavated soil to form a new ridge, and a weeding device attached to the ridge coating machine, which is made of a board and has a blade that scrapes the soil on the top surface of the original ridge prior to forming the new ridge.

[0022] The furrow application machine has a machine frame attached to a traveling vehicle, and a first mounting part and a second mounting part provided on the machine frame, and the weeding device has a head part support attached to the first mounting part, and a head part attached to the head part support and including the blade, and the head part may be detachable from the head part support and attachable to the second mounting part.

[0023] The head support may be attached to the first attachment part so that its position can be adjusted in the up and down direction. [Effects of the Invention]

[0024] With the above-mentioned weeding device, weeds are removed from the top surface of the original ridge prior to the formation of a new ridge by scraping the soil on the top surface of the original ridge with a blade made of a board, so that even if tall weeds grow thickly on the top surface of the original ridge, the weeds can be prevented from becoming entangled in the weeding device. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic perspective view showing the overall configuration of a ridge forming machine. [Figure 2] FIG. 10 is a plan view showing the state in which the ridge forming machine is connected to the traveling vehicle. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] 3 is a side view of the head unit as seen from the direction of arrow Z1 in FIG. 2. FIG. [Figure 10] FIG. 10 is a plan view showing that the blade is inclined. [Figure 11] FIG. 2 is a perspective view of a blade support and a blade mounting body. [Figure 12] FIG. [Figure 13] 10 is a cross-sectional view taken along the line Z2-Z2 of FIG. 9. [Figure 14] FIG. [Figure 15] 10 is a cross-sectional view taken along the line Z3-Z3 in FIG. 9. [Figure 16] FIG. 4 is an enlarged cross-sectional view of the overload avoidance mechanism. [Figure 17] FIG. 2 is a perspective view of the head portion from below, with the blade omitted. [Figure 18] FIG. 10 is a plan view showing a state in which the inclination angle of the blade is changed. [Figure 19] FIG. 10 is a front view showing how the head unit is attached to the second attachment unit. [Figure 20] FIG. 10 is a plan view showing another example of the inclination state of the blade. [Figure 21] FIG. 10 is a perspective view showing a weeding device according to another embodiment. [Figure 22] This is an oblique view of another embodiment of a weeding device seen from the outside of the base ridge. [Figure 23] FIG. 10 is a perspective view of a weeding device according to another embodiment, as viewed from below. [Figure 24] FIG. 10 is a plan view of a weeding device according to another embodiment. [Figure 25] FIG. 10 is an exploded perspective view of a weeding device according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.

[0027] Fig. 1 is a schematic perspective view showing the overall configuration of a ridge forming machine 1 according to one embodiment. Fig. 2 is a plan view showing the ridge forming machine 1 coupled to a traveling vehicle 2. Fig. 3 is a side view of the ridge forming machine 1. Fig. 4 is a rear view of the ridge forming machine 1.

[0028] As shown in Figures 1, 2 and 3, the ridge forming machine 1 has a ridge application machine 3 that digs up soil and tamps the excavated soil to form a new ridge 6, and a weeding device 4 provided on the ridge application machine 3. As shown in Figure 2, the ridge forming machine 1 (ridge application machine 3) is coupled to a traveling vehicle 2, and forms the new ridge 6 while traveling together with the traveling vehicle 2 through a field 7 along an original ridge (an originally existing ridge) 5. The traveling vehicle 2 is, for example, a tractor.

[0029] In the ridge forming machine 1 (ridge application machine 3, weeding device 4) of this embodiment, the forward direction of the tractor 2 (the direction of arrow A1 in Figures 2 and 3) is referred to as the forward direction. Forward is the traveling direction A1 of the ridge forming machine 1 (ridge application machine 3, weeding device 4). The direction opposite to the forward direction of the tractor 2 (the direction of arrow A2 in Figures 2 and 3) is referred to as the rear. The direction of arrow K1 in Figures 2 and 3 is referred to as the front-to-rear direction. The left side of the forward direction of the tractor 2 (the direction of arrow B1 in Figure 2, the back side in Figure 3) is referred to as the left side, and the right side of the forward direction of the tractor 2 (the direction of arrow B2 in Figure 2, the front side in Figure 3) is referred to as the right side.

[0030] Furthermore, the horizontal direction, which is perpendicular to the front-to-rear direction K1, will be described as the machine body width direction K2 (see Figure 2). The direction from the center of the width direction of the ridge coating machine 3 toward the right or left will be described as the machine body width direction outward. In other words, the machine body width direction outward is the direction away from the center of the width direction of the ridge coating machine 3 in the machine body width direction K2. The direction opposite to the machine body width direction outward will be described as the machine body width direction inward. In other words, the machine body width direction inward is the direction approaching the center of the width direction of the ridge coating machine 3 in the machine body width direction K2.

[0031] As shown in Figures 1 and 2, the ridge coating machine 3 is equipped with a machine frame 8, a pre-treatment section 9 that digs up the soil, and a ridge forming section 10 that tamps (compacts) the soil excavated in the pre-treatment section 9 to form a new ridge 6.

[0032] As shown in FIGS. 1 and 2, the machine frame 8 has a first machine frame 11, an offset mechanism 12, and a second machine frame 13.

[0033] As shown in Fig. 2, the first frame 11 is detachably and vertically movably connected to a connecting link mechanism 14 mounted on the rear of the tractor 2. In this embodiment, the connecting link mechanism 14 is configured as a three-point link mechanism. The three-point link mechanism 14 has one top link 15 and a pair of lower links 16 arranged side by side in the width direction of the machine body below the top link 15. The pair of lower links 16 are driven to move up and down (the rear portions thereof swing up and down) by a hydraulic device (not shown).

[0034] 1 and 2, the first machine frame 11 has a mounting frame 17 and a support frame 18. The mounting frame 17 has a top link connection portion 17a to which the top link 15 is connected, and a lower link connection portion 17b to which the lower link 16 is connected. The support frame 18 is formed of a rectangular pipe that is long in the width direction of the aircraft body, and is connected to the rear of the mounting frame 17.

[0035] The offset mechanism 12 has a swing link 12A composed of a parallel link, a swing frame 12B connected to the support frame 18 via the swing link 12A so as to be movable in the width direction of the aircraft, and a regulating member 12C that regulates the swing of the swing frame 12B.

[0036] As shown in FIG. 5, the second machine frame 13 has a gear case 19, a pair of support arms 20L, 20R protruding left and right from the gear case 19, a first transmission case 21 whose rear portion is connected to the right support arm 20R, a second transmission case 22 whose front portion is connected to the rear portion of the first transmission case 21, and a frame member 23 fixed to the first transmission case 21. The gear case 19 has an input shaft 25. The input shaft 25 introduces power transmitted from a PTO shaft (power take-off shaft) of the tractor 2 via a joint into the gear case 19. The power introduced into the gear case 19 is transmitted to the transmission mechanism in the first transmission case 21 via a transmission shaft provided in the gear case 19 and the right support arm 20R, and is also transmitted to the transmission mechanism in the second transmission case 22.

[0037] As shown in Fig. 4, the second machine frame 13 (support arms 20L, 20R and second transmission case 22, etc.) is connected to the swing frame 12B of the offset mechanism 12 via a bracket 24. Therefore, the second machine frame 13 (pre-processing section 9 and ridge forming section 10) can move in the width direction of the machine body relative to the first machine frame 11, that is, can be offset laterally relative to the first machine frame 11 (tractor 2). Fig. 2 shows a state in which the second machine frame 13 (pre-processing section 9 and ridge forming section 10) is offset to the right.

[0038] As shown in Figure 5, the frame member 23 has an upright member 23A fixed to the front of the first transmission case 21 in an upwardly protruding manner, a lateral member 23B extending outward (to the right) in the width direction of the aircraft from the upper part of the upright member 23A, and a fixed plate 23C fixed to the end (right end) of the lateral member 23B in the width direction of the aircraft.

[0039] The lateral member 23B is provided with a first mounting part 26 and a second mounting part 27. In other words, the ridge coating machine 3 has the first mounting part 26 and the second mounting part 27 provided on a machine frame 8 that is attached to the tractor 2 (traveling vehicle). The first mounting part 26 and the second mounting part 27 are formed by a rectangular cylindrical body having an axis that extends in the vertical direction, and are fixed to the lateral member 23B.

[0040] The first mounting portion 26 and the second mounting portion 27 are provided outward in the width direction of the aircraft body from the center of the lateral member 23B in the width direction of the aircraft body. Specifically, the first mounting portion 26 is located at the end (right end) of the lateral member 23B that is outward in the width direction of the aircraft body, and is fixed to the fixing plate 23C. The first mounting portion 26 is fixed to the fixing plate 23C via a base member 28 so that its front surface faces in an inclined direction that changes to the left as it moves forward (diagonally forward left). The second mounting portion 27 is located in a position spaced inward in the width direction of the aircraft body from the first mounting portion 26, and stands upright on the lateral member 23B.

[0041] As shown in FIG. 2, the pre-treatment section 9 is provided on one side (right side) of the front part of the machine frame 8. The pre-treatment section 9 has a rotary shaft 29 that rotates around an axis extending in the width direction of the machine body, and a plurality (numerous) tillage tines 30 provided on the rotary shaft 29. As shown in FIG. 5, the rotary shaft 29 protrudes outward (to the right) in the width direction of the machine body from the front part of the first transmission case 21, and is driven to rotate around its axis by a transmission mechanism within the first transmission case 21. The rotary shaft 29 is disposed below the lateral member 23B. A plurality (numerous) of tine mounting fixtures 31 are provided on the rotary shaft 29 at intervals in the axial direction of the rotary shaft 29.

[0042] As shown in Figures 2 and 4, a tillage tine 30 is attached to each tine mounting fixture 31. Note that Figures 1 and 3 only show a portion of the tillage tine 30. The rotating shaft 29 and the tillage tine 30 rotate, for example, in the direction of arrow C1 shown in Figure 3 to dig up the soil in the field 7. Note that although the tillage tine 30 is shown rotating in a down-cut direction (direction C1) to dig up the soil, the tillage tine 30 may also be configured to rotate in an up-cut direction (the opposite direction to direction C1) to dig up the soil.

[0043] As shown in FIG. 2, the ridge forming section 10 is provided on one side (right side) of the rear of the machine frame 8 and behind the pre-processing section 9. The ridge forming section 10 has a ridge forming drum 32 arranged on the side (right side) of the rear of the second transmission case 22, and this ridge forming drum 32 is used to cut the soil dug in the pre-processing section 9. The raised soil is spread on the original ridge 5 to form the sides and top of the new ridge 6. In more detail, as shown in Figure 4, the ridge forming drum 32 has a truncated cone-shaped side forming portion 32A that forms the inclined ridge sides and a cylindrical (cylindrical) top surface forming portion 32B that forms the horizontal ridge top surface, and is driven to rotate by power from the transmission mechanism in the second transmission case 22 to form the new ridge 6. The height of the ridge forming portion 10 can also be adjusted by the height adjustment mechanism 33 shown in Figure 1.

[0044] As shown in Figure 1, the ridge coating machine 3 has a cover device 34 that prevents scattering of soil released by the pre-treatment section 9. The cover device 34 has a first cover 34A that covers the pre-treatment section 9 and a second cover 34B that covers from the pre-treatment section 9 to the front of the ridge forming section 10. The first cover 34A is attached to the frame member 23 or the like.

[0045] Incidentally, when the ridge coating machine 3 is used to tamp down the soil on the original ridge 5, if weeds grow on the top surface of the original ridge 5 and the soil is tamped down on the original ridge 5 with the weeds still present, this will have an adverse effect on the settling of the tamped soil on the original ridge 5. Therefore, in this embodiment, a weeding device 4 equipped with a blade 36 is attached to the ridge coating machine 3, and the blade 36 of the weeding device 4 is used to scrape off weeds growing on the top surface of the original ridge 5 together with the soil on the top surface of the original ridge 5 prior to the formation of the new ridge 6, thereby removing (weeding) the grass on the top surface of the original ridge 5.

[0046] As shown in Figures 1, 2 and 3, the weeding device 4 has a head portion 37 having a blade 36 that scrapes the soil on the upper surface 5a of the base ridge 5, and a head portion support 38 that supports the head portion 37 and is attached to the frame 8 of the ridge coating machine 3.

[0047] First, the head support 38 will be described.

[0048] 5 and 6, head support 38 has a rear base member 38A, a middle arm member 38B, and a front (tip side) tip member 38C. Base member 38A, arm member 38B, and tip member 38C are formed of rectangular cylindrical bodies.

[0049] The base member 38A is attached to the first mounting part 26 provided on the machine frame 8 of the ridge coating machine 3. In detail, as shown in Fig. 5, the base member 38A is arranged to extend in the vertical direction, with its lower part inserted into the first mounting part 26, and is detachably fixed to the first mounting part 26 by a pin 39 that is inserted through the first mounting part 26 and the base member 38A.

[0050] The base member 38A is also attached to the first mounting portion 26 (ridge coating machine 3) so that its vertical position can be adjusted. Specifically, as shown in FIG. 6, a plurality of pin insertion holes 40 are formed in the lower portion of the base member 38A and spaced apart in the vertical direction. The vertical position can be adjusted by selecting one of the pin insertion holes 40 and inserting a pin 39 between the selected pin insertion hole 40 and the first mounting portion 26. The height of the blade 36 can be adjusted by adjusting the vertical position of the base member 38A (head support 38). This allows the height of the blade 36 (cutting edge 36a) to be set according to the height of the base ridge 5, the condition of the grass roots growing on the upper surface 5a of the base ridge 5, and other factors.

[0051] In this embodiment, six pin insertion holes 40 are formed, and the height of the weeding device 4 relative to the ridge application machine 3 can be adjusted in six steps. In other words, the height of the blade 36 (the height of the cutting edge 36a of the blade 36) can be adjusted in six steps. This is not limited to this, and the height of the blade 36 may be adjusted in steps other than six (seven or more steps or five or less steps). The height of the blade 36 can be adjusted in 20 mm increments, for example. The height of the blade 36 may also be adjusted continuously.

[0052] As shown in Fig. 2, the arm member 38B is disposed on the front side of the base member 38A so as to extend in an inclined direction that transitions inward (leftward) in the fuselage width direction as it moves forward. The rear portion of the arm member 38B is fixed to the front surface of the upper portion of the base member 38A. Therefore, the arm member 38B protrudes diagonally forward and left from the upper portion of the base member 38A.

[0053] 6, tip member 38C is disposed on the front side of arm member 38B so as to extend in the vertical direction. The rear surface of the upper part of tip member 38C is fixed to the front part of arm member 38B. The lower part of tip member 38C protrudes downward from the front part of arm member 38B.

[0054] Next, the head unit 37 will be described.

[0055] As shown in FIG. 5, the head portion 37 is attached to a tip member 38C of a head portion support 38. As shown in Fig. 2, the head unit 37 is disposed in front of the pre-treatment unit 9 and above the base ridge 5. The head unit 37 may also be disposed to the side (right side) of the pre-treatment unit 9.

[0056] As shown in Figures 7 and 8, the head portion 37 has a blade body 41, a blade support body 42 that supports the blade body 41, and a head portion mounting body 43 that is attached to the head portion support body 38 (tip member 38C).

[0057] As shown in Figures 1 and 2, the blade body 41 moves in the traveling direction A1 as the ridge coater 3 moves in the traveling direction A1 together with the tractor 2, and scrapes the soil off the upper surface 5a of the original ridge 5 prior to forming the new ridge 6. As shown in Figures 7 and 8, the blade body 41 has a blade 36 formed from a plate material and a blade mounting body 44 to which the blade 36 is attached.

[0058] As shown in Figures 7 and 8, the blade 36 is formed by bending a plate material and has a cutting edge 46 that forms the lower portion of the blade 36 and a guide portion 47 that forms the middle and upper portion of the blade 36. As shown in Figure 9, the cutting edge 46 is formed with a downward slope toward the front and has a cutting edge 36a at the lower end. As shown in Figures 2 and 10, the cutting edge 36a is inclined with respect to the direction of travel A1. This reduces soil resistance and enables smooth scraping of the soil on the upper surface 5a of the base ridge 5. In the example of Figure 10, the cutting edge 36a is inclined in the opposite direction to the direction of travel A1 as it moves from the outer side 5A of the base ridge 5 to the inner side 5B. In other words, the cutting edge 36a is inclined rearward as it moves inward (leftward) in the width direction of the machine body.

[0059] The inside 5B of the original ridge 5 (also called the inside of the original ridge) is the side of the original ridge 5 facing the field 7, and the outside 5A of the original ridge 5 (also called the outside of the original ridge) is the side opposite the side of the original ridge 5 facing the field 7.

[0060] As shown in Figure 1, the height of the blade 36 is adjusted so that the cutting edge 46 bites (penetrates) downward from the upper surface 5a of the original ridge 5. The height of the blade 36 (blade body 41) is adjusted, for example, so that the cutting edge 36a is 20 mm to 40 mm lower than the upper surface 5a of the original ridge 5 when the ridge coating machine 3 is in operation (during ridge coating work). In addition, the height of the cutting edge 36a of the blade 36 is typically positioned 30 mm or less above the lower end of the upper surface forming portion 32B of the ridge forming unit 10 when the ridge coating machine 3 is in an operating position for forming a new ridge 6.

[0061] 9, the guide portion 47 has a first portion 47a extending diagonally upward and rearward from the upper end of the blade portion 46, a second portion 47b extending upward from the first portion 47a, and a third portion 47c extending diagonally upward and frontward from the second portion 47b. The guide portion 47 may be formed in a curved shape without corners or flat surfaces (i.e., rounded overall).

[0062] As shown in Figure 10, the blade 36 is inclined in a direction opposite to the traveling direction A1 of the ridge coating machine 3 as it moves from the outer side 5A to the inner side 5B of the base ridge 5. In other words, the blade 36 is inclined so that it moves rearward as it moves inward (leftward) in the width direction of the machine body. The blade 36 is a member that is long in the inclined direction (the direction along the cutting edge 36a). In other words, the longitudinal direction E1 of the blade 36 (referred to as the blade longitudinal direction) is inclined with respect to the traveling direction A1.

[0063] The blade 36 described above moves (horizontally, parallelly) along the traveling direction A1, and uses the cutting edge 46 (cutting edge 36a) to scrape off weeds growing on the upper surface 5a of the original ridge 5 together with the soil on the upper surface 5a of the original ridge 5. In other words, the blade 36 has a cutting edge 36a (cutting edge 46) that scrapes off the soil on the upper surface 5a of the original ridge 5 by moving along the traveling direction A1 of the ridge coating machine 3. The soil and weeds on the upper surface 5a of the original ridge 5 scraped off by the blade edge 46 move from the blade edge 46 to the guide edge 47. The soil and weeds moving to the guide edge 47 move from the blade edge 46 to the first portion 47a and the second portion 47b, and their upward movement is restricted by the third portion 47c. Furthermore, since the blade 36 is inclined so as to move rearward as it moves inward in the width direction of the machine body, the soil and grass that have moved to the guide section 47 move along the guide section 47 in the direction from the outer side 5A to the inner side 5B of the base ridge 5 in the blade longitudinal direction E1 (diagonally rearward to the left, in the direction of arrow G1 in Figure 10) and are poured into the field 7. Therefore, the soil and weeds scraped off by the blade section 46 do not remain on the upper surface 5a of the base ridge 5. Furthermore, the soil and weeds scraped off by the blade 36 and moved to the inner side 5B of the base ridge 5 are guided in front of the pre-treatment section 9. The weeds that have been guided to the pre-treatment section 9 are immediately ground by the pre-treatment section 9. The material is crushed and then tamped together with the soil into the original ridge 5 by the ridge forming unit 10.

[0064] As shown in Figures 7, 8, and 11, the blade mounting body 44 has a pair of side plates 48, a pair of blade mounting plates 49, a connecting member 50 that connects the pair of side plates 48, and a holding portion 51 provided on each side plate 48.

[0065] As shown in Fig. 7, a pair of side plates 48 are provided facing each other with a gap in the blade longitudinal direction E1. In other words, the side plates 48 are arranged on one side (the inner side of the base ridge 5B) and the other side (the outer side of the base ridge 5A) of the blade longitudinal direction E1 so as to sandwich the blade support body 42 in the blade longitudinal direction E1. The side plates 48 are also arranged on one side (the inner side of the base ridge 5B) and the other side (the outer side of the base ridge 5A) of the blade 36 in the blade longitudinal direction E1. The side plate 48B on one side is arranged closer to the center of the blade 36 in the blade longitudinal direction E1, and the side plate 48A on the other side is arranged closer to the end of the blade 36 on the outer side of the base ridge 5A.

[0066] As shown in FIG. 9, each side plate 48 has a main plate portion 48a that forms the upper portion of the side plate 48, and an extension plate portion 48b that extends downward from the rear portion of the main plate portion 48a.

[0067] 7 and 8, the blade mounting plate 49 is disposed on the front side of the lower portion of each side plate 48. The blade mounting plate 49 has a lower plate portion 49a fixed to the extension plate portion 48b, and an upper plate portion 49b extending obliquely upward and forward from the upper end of the lower plate portion 49a and fixed to the lower end side of the main plate portion 48a. The upper portion of the upper plate portion 49b is bifurcated so as to sandwich the main plate portion 48a.

[0068] As shown in Figure 7, the guide portion 47 of the blade 36 protrudes a greater amount from one blade mounting plate 49B (inside the original ridge 5B) than from the other blade mounting plate 49A (outside the original ridge 5A). The reason why the guide portion 47 protrudes a greater amount from one blade mounting plate 49B is to properly guide the scraped soil and grass to the pre-treatment section 9. In other words, the blade 36 is extended to the inside original ridge 5B to guide the scraped soil and grass in front of the pre-treatment section 9. The reason why the guide portion 47 protrudes a smaller amount from the other blade mounting plate 49A is to reduce weight.

[0069] 7 and 9, the blade 36 is detachably attached to a pair of blade mounting plates 49 by fasteners 52 each including a bolt and a nut. More specifically, the rear surface of the second portion 47b of the blade 36 is in surface contact with the front surface of the lower plate portion 49a of the blade mounting plate 49, and the upper surface of the third portion 47c is in surface contact with the lower surface of the lower part of the upper plate portion 49b, so that the second portion 47b is detachably attached to the lower plate portion 49a by the fasteners 52. Therefore, the blade body 41 is configured so that only the blade 36 can be replaced.

[0070] 7 and 8, the connecting member 50 connects the upper rear portions of the main plate portions 48a together. Specifically, the connecting member 50 is formed of a rod member that passes through from one side plate 48B to the other side plate 48A and is prevented from coming off by a retaining ring. This makes it possible to restrict the main plate portions 48a of the pair of side plates 48 from expanding apart.

[0071] As shown in Fig. 11, the retaining portion 51 is attached to the upper part of the main plate portion 48a. More specifically, as shown in Fig. 14 and 16, the retaining portion 51 is formed in an annular shape and has a tubular portion 51a that passes through a through-hole 53 formed in the upper part of the main plate portion 48a, and a flange portion 51b that abuts against the opposing surface of the main plate portion 48a. The flange portion 51b is fixed to the main plate portion 48a with bolts or the like.

[0072] As shown in FIGS. 7 and 8, the blade support 42 is disposed between the upper portions of a pair of side plates 48.

[0073] 11, the blade support 42 has a base plate 54, a pair of support plates 55, and a pair of overload avoidance mechanisms 56. The base plate 54 is formed from a plate material and is arranged so that the plate surface faces in the vertical direction.

[0074] 12, the base plate 54 has an opening 57 penetrating in the vertical direction. The opening 57 is located at approximately the center of the base plate 54 in the blade longitudinal direction E1. The opening 57 is formed closer to the inner side of the base ridge 5B in the horizontal direction (direction of arrow D1) perpendicular to the blade longitudinal direction E1. The opening 57 is formed in an elliptical shape that is long in the D1 direction.

[0075] As shown in Fig. 12, the base plate 54 has a plurality of mounting holes 58 formed around the opening 57 to penetrate the base plate 54 in the up-down direction. The plurality of mounting holes 58 include a first mounting hole 58a to a sixth mounting hole 58f. The first mounting hole 58a to the fourth mounting hole 58d and the fifth mounting hole 58e and the sixth mounting hole 58f are formed on either side of the opening 57 in the blade longitudinal direction E1, sandwiching the opening 57 therebetween. The first mounting hole 58a to the fourth mounting hole 58d are circular holes. The fifth mounting hole 58e and the sixth mounting hole 58f are oval holes.

[0076] 12, of the pair of support plates 55, one support plate 55B is fixed to one end of the base plate 54 in the blade longitudinal direction E1. The other support plate 55A is fixed to the other end of the base plate 54 in the blade longitudinal direction E1. Furthermore, one support plate 55B faces the upper part (main plate portion 48a) of one side plate 48B, and the other support plate 55A faces the upper part (main plate portion 48a) of the other side plate 48A.

[0077] As shown in FIGS. 11 and 14, the pair of support plates 55 has a first portion 55a and a second portion 55b. The first portion 55a is located at a position corresponding to the portion of the main plate portion 48a where the through hole 53 is formed. The first portion 55a also protrudes upward from the base plate 54. The first portion 55a also faces the holding portion 51. As shown in FIG. 14, a circular opening 59 is formed through the first portion 55a at a position facing the holding portion 51. As shown in FIG. 11, the second portion 55b extends downward from the front portion of the first portion 55a. The second portion 55b also protrudes downward from the base plate 54.

[0078] 9 and 11, the lower part of the second portion 55b (support plate 55) has a pivot portion 55c that pivots around a pivot shaft 60 the side plate 48 on the same side in the blade longitudinal direction E1. In other words, the blade support 42 supports the blade attachment body 44, to which the blade 36 is attached, so that the blade 36 can pivot around the pivot shaft 60. Therefore, the blade 36 is supported by the blade support 42 via the blade attachment body 44 so as to be pivotable around the pivot shaft 60.

[0079] 11 and 14, the main plate portion 48a of the side plate 48 has a pivotable portion 48c, which is pivotally supported by the pivot portion 55c, at its lower front portion. As shown in FIG. 13, a pivotal support member 61 is attached to each of the pivotal portion 55c and the pivotable portion 48c. A rotation shaft 60 is inserted between the pivotal support member 61 attached to the pivotal portion 55c and the pivotal support member 61 attached to the pivotable portion 48c. The rotation shaft 60 has an axis parallel to the extension direction of the cutting edge 36a (the blade longitudinal direction E1). With the above configuration, the pivotable portion 48c (blade mounting body 44) is supported by the pivotal portion 55c (blade support body 42) by the rotation shaft 60 so as to be rotatable about the axis of the rotation shaft 60.

[0080] As shown in Figures 11 and 12, the pair of overload avoidance mechanisms 56 are provided on the upper surface side of the base plate 54. Specifically, the pair of overload avoidance mechanisms 56 are provided closer to the outer side of the base ridge 5A in the direction D1 than the openings 57 (see Figures 2 and 12). The pair of overload avoidance mechanisms 56 are also provided in a distributed manner in the blade longitudinal direction E1 with respect to the center of the blade support body 42 in the blade longitudinal direction E1. Specifically, as shown in Figure 12, one overload avoidance mechanism 56B is disposed on one side of the base plate 54 in the blade longitudinal direction E1 and corresponds to one side of the side plate 48B, and the other overload avoidance mechanism 56A is disposed on the other side of the base plate 54 in the blade longitudinal direction E1 and corresponds to the other side of the side plate 48A.

[0081] As shown in Figures 14, 15, and 16, the overload avoidance mechanism 56 includes a housing member 62, a pair of spring retainers 63A and 63B, a compression spring 64 (biasing member), a cylindrical body 65, a ball 66, and a pressing bolt 67. The housing member 62 is formed of a cylindrical body and is disposed between a bracket 68 fixed to the base plate 54 and the support plate 55. One end of the housing member 62 is inserted into an opening 59 and fixed to the support plate 55, and the other end is fixed to the bracket 68. The spring retainer 63A, the compression spring 64, the spring retainer 63B, the cylindrical body 65, and the ball 66 are inserted into the housing member 62 from the opening 59 side in this order. The pressing bolt 67 is screwed into a threaded hole 68a formed in the bracket 68 and presses the spring retainer 63A to compress the compression spring 64. The threaded hole 68a is a hole with an internal thread on its inner circumferential surface.

[0082] The overload avoidance mechanism 56 is assembled by inserting a pair of spring holders 63A, 63B, a compression spring 64, a cylindrical body 65, and a ball 66 into the housing member 62, attaching the blade mounting body 44 to the blade support 42 in this state, and then screwing in the pressing bolt 67. In this assembled state, the ball 66 fits into the holding portion 51. The ball 66 is then pressed against the holding portion 51 by the biasing force of the compression spring 64 compressed by the pressing bolt 67. The ball 66 is biased by the compression spring 64 to fit into the holding portion 51 and be pressed against the holding portion 51, thereby restricting rotation of the blade mounting body 44 about the rotation axis 60. In other words, the biasing force of the compression spring 64 (biasing member) restricts rotation of the blade mounting body 44 (blade 36) about the rotation axis 60.

[0083] Because the head portion 37 has an overload avoidance mechanism 56, when the blade 36 hits an obstacle such as a large stone or stump and is subjected to excessive force, the blade 36 rotates in a direction to avoid the obstacle (in the direction of arrow H1 in Figure 9), thereby preventing damage to the weeding device 4 or the furrow coating machine 3.

[0084] 9, when an overload F1 acts on the blade 36 from the front side, the ball 66 receives a load from the retaining portion 51, and the load received from the retaining portion 51 causes the ball 66 to compress the compression spring 64 and move in the direction compressing the compression spring 64. When the ball 66 moves in the direction compressing the compression spring 64, the ball 66 comes off the retaining portion 51. When the ball 66 comes off the retaining portion 51, rotation of the blade attachment body 44 about the rotation axis 60 is permitted, and the blade attachment body 44 (blade 36) rotates upward about the rotation axis 60 against the biasing force of the compression spring 64, as shown by the two-dot chain line in FIG. 9 (in the direction indicated by the arrow H1).

[0085] In other words, when a force acts on the cutting edge 36a of the blade 36 and the moment of that force around the rotation axis 60 exceeds a threshold value, the ball 66 is pushed back inside the accommodating member 62 and comes off the holding portion 51, and the blade body 41 (blade 36 and blade mounting body 44) rotates around the axis 60a of the rotation axis 60.

[0086] Furthermore, since the center of gravity of the blade body 41 (blade 36 and blade mounting body 44) is located at the bottom of the blade body 41 and is away from the pivot axis 60, once the blade body 41 rotates upward around the pivot axis 60 and the excessive load acting on the blade 36 is eliminated, the blade body 41 returns under its own weight to a position where the ball 66 fits into the retaining portion 51.

[0087] As shown in FIG. 8 , the head portion attachment body 43 has an attachment plate 69 to which the base plate 54 of the blade support 42 is attached, and an attachment member 70 to which the tip member 38C of the head portion support 38 is attached. The attachment plate 69 is formed into a circular shape using a plate material and is arranged so that the plate surface faces in the vertical direction. The attachment member 70 is configured as a rectangular cylindrical body. The attachment member 70 is also arranged so as to extend in the vertical direction and concentrically with the center of the attachment plate 69, with its lower end penetrating the attachment plate 69 and fixed to it. Therefore, the attachment member 70 is provided so as to protrude upward from the attachment plate 69.

[0088] 8 and 17, the head portion mounting body 43 has a mounting member 70 inserted through the opening 57 from below the base plate 54 to bring the mounting plate 69 into contact with the underside of the base plate 54, and the mounting plate 69 is attached to the base plate 54 (blade support body 42) with a plurality of bolts 71 and a plurality of nuts 72. The plurality of bolts include a first bolt 71A to a fourth bolt 71D. The plurality of nuts 72 include a first nut 72A to a fourth nut 72D.

[0089] As shown in Fig. 5, the head portion attachment body 43 (head portion 37) is attached to the head portion support body 38 by fitting an attachment member 70 onto the bottom of the tip member 38C and then passing a pin 73 through the attachment member 70 and the tip member 38C. At this time, as shown in Fig. 2, the head portion 37 is attached to the head portion support body 38 so that the cutting edge 36a of the blade 36 is inclined at a predetermined angle with respect to the traveling direction A1.

[0090] In this embodiment, when the blade 36 scrapes the upper surface 5a of the base ridge 5, the blade 36 In order to accommodate the magnitude of the load acting on the blade 36, the angle of inclination of the cutting edge 36a of the blade 36 with respect to the traveling direction A1 is freely changeable. The angle of inclination of the cutting edge 36a with respect to the traveling direction A1 is changed by changing the attachment state of the blade support body 42 with respect to the head attachment body 43. In other words, the blade support body 42 is attached to the head attachment body 43 in such a way that the angle of inclination of the cutting edge 36a of the blade 36 with respect to the traveling direction A1 can be changed.

[0091] Specifically, as shown in Fig. 10, in the standard mounting state, the inclination angle θ of the cutting edge 36a of the blade 36 with respect to the traveling direction A1 is, for example, 30°. However, this is not limited to this. In this standard mounting state, as shown in Fig. 12, the mounting member 70 is positioned toward one end 57a of the opening 57, the first bolt 71A is inserted through the first mounting hole 58a, the second bolt 71B is inserted through the third mounting hole 58c, the third bolt 71C is inserted through one end 58g of the fifth mounting hole 58e, and the fourth bolt 71D is inserted through one end 58h of the sixth mounting hole 58f. The bolt holes (not shown) formed in the mounting plate 69 and through which the first to fourth bolts 71A to 71D are inserted are circular holes.

[0092] To change the inclination angle θ of the cutting edge 36a from this standard mounting state, remove the first through fourth bolts 71A through 71D from the state shown in FIGS. 10 and 12 , move the blade support 42 so that the other end 57b of the opening 57 approaches the mounting member 70, and rotate the blade support 42 counterclockwise in FIG. 12 (the direction of arrow P1 in FIG. 12 ) around a vertical line extending in the up-down direction, aligning the other end 58i of the second mounting hole 58b, the fourth mounting hole 58d, the fifth mounting hole 58e, and the other end 58j of the sixth mounting hole 58f with the bolt holes formed in the mounting plate 69. As a result, as shown in FIG. 18 , the inclination angle θ of the cutting edge 36a of the blade 36 with respect to the traveling direction A1 becomes smaller (tighter) than in the standard mounting state. The inclination angle θ of the cutting edge 36a with respect to the traveling direction A1 at this time is, but is not limited to, 20°. In this state, the first bolt 71A is inserted through the second mounting hole 58b and the bolt hole of the mounting plate 69, the second bolt 71B is inserted through the fourth mounting hole 58d and the bolt hole of the mounting plate 69, the third bolt 71C is inserted through the other end side 58i of the fifth mounting hole 58e and the bolt hole of the mounting plate 69, and the fourth bolt 71D is inserted through the other end side 58j of the sixth mounting hole 58f and the bolt hole of the mounting plate 69, thereby fixing the base plate 54 (blade support body 42) to the mounting plate 69.

[0093] In this embodiment, the inclination angle θ of the cutting edge 36a with respect to the traveling direction A1 can be changed in two stages, but this is not limited to this and may be configured to be changeable in three or more stages. Also, the inclination angle θ of the cutting edge 36a with respect to the traveling direction A1 may be configured to be changeable continuously rather than in stages.

[0094] In the ridge forming machine 1 of this embodiment, the head unit 37 can be detached from the head unit support 38 and attached (retained) to the machine frame 8 when ridge coating is not being performed. Specifically, as shown in FIG. 19 , after detaching the head unit 37 from the head unit support 38, the head unit 37 can be held in the second mounting part 27 by turning it upside down, fitting the mounting member 70 of the head unit mounting body 43 into the second mounting part 27, and inserting a pin through the mounting member 70 and the second mounting part 27. In other words, when ridge coating is not being performed, the head unit 37 can be stored above the first cover 34A that covers the pre-treatment unit 9. The second mounting part 27 is located inward in the machine body width direction relative to the first mounting part 26. This positions the center of gravity of the ridge forming machine 1 inward in the machine body width direction when ridge coating is not being performed, thereby reducing the load on the ridge coating machine 3.

[0095] Furthermore, when not performing ridge painting work, the head support body 38 can be removed from the first mounting part 26, rotated 180 degrees, and attached to the first mounting part 26 in this rotated state, as shown by the two-dot chain line in Figure 2, thereby placing the head support body 38 in a stored state in which it extends rearward.

[0096] In the above-described embodiment, the blade 36 is provided on an incline that moves in the opposite direction to the traveling direction A1 of the ridge coating machine 3 as it moves from the outside 5A of the original ridge 5 to the inside 5B, and the scraped soil is guided to the inside 5B of the original ridge, but this is not limited to this. As shown in FIG. 20, the blade 36 is provided on an incline that moves in the opposite direction (rearward) to the traveling direction A1 of the ridge coating machine 3 as it moves from the inside 5B of the original ridge 5 to the outside 5A, and the scraped soil is guided to the outside 5A of the original ridge. Some owners of farm fields may not want the scraped soil to be put into the farm field 7, and this can be accommodated.

[0097] In addition, the head portion 37 having an inclined shape that transitions rearward as the blade 36 moves inward in the width direction of the fuselage, and the head portion 37 having an inclined shape that transitions rearward as the blade 36 moves outward in the width direction of the fuselage, may be manufactured separately, or a single head portion 37 may be configured so that it can be changed between an inclined state in which the blade 36 transitions rearward as it moves inward in the width direction of the fuselage, and an inclined state in which the blade 36 transitions rearward as it moves outward in the width direction of the fuselage.

[0098] 21 to 25 show a weeding device 4 according to another embodiment.

[0099] In the weeding device 4 of this other embodiment, the structure of the head part 37 is different from that of the above embodiment, and the head part support 38 is configured in the same way as in the above embodiment.

[0100] As shown in Figures 21 to 25, in the weeding device 4 according to this other embodiment, the head section 37 also has a blade body 41, a blade support 42, and a blade attachment body 44, and the blade body 41 has a blade 36 and a blade attachment body 44. The blade 36 is configured in the same manner as in the above embodiment. The blade attachment body 44 has a different structure from that in the above embodiment. The blade support 42 has a different structure from that in the above embodiment. The head section attachment body 43 is configured in substantially the same manner as in the above embodiment. Components similar to those in the above embodiment are given the same reference numerals and will not be described again, and the following mainly describes the components different from those in the above embodiment.

[0101] 22 and 24, the blade attachment body 44 has a pair of side plates 75 arranged facing each other with a gap in between in the direction along the blade longitudinal direction E1, and a spring hook portion 76 provided on each side plate 75. In this other embodiment, the side plate 75 has a first portion 75a extending in the vertical direction on the side of the attachment member 70 in the blade longitudinal direction E1, a second portion 75b extending obliquely downward from a lower portion of the first portion 75a toward the blade 36, and a third portion 75c extending obliquely downward from a lower portion of the second portion 75b and then extending downward.

[0102] 22, each side plate 75 has a pivoted portion 75d at the connection between the first portion 75a and the second portion 75b, which is pivotally supported on a pivot portion 78a of the blade support 42 via a rotation shaft 60. Spring hook portions 76 are provided on opposing sides of the upper portion of the first portion 75a. The blade 36 is attached to the third portion 75c of each side plate 75 by welding. The blade attachment body 44 has a reinforcing member 77 fixed across the side plate 75 and the blade 36.

[0103] As shown in Figures 23 and 25, the blade support 42 has a base plate 78 having a pivot portion 78a, a stopper 79, and a spring hook plate 80. As shown in Figure 24, the opening 57 of the head portion attachment body 43, through which the attachment member 70 is inserted, is formed in a circular shape centered on the center of the attachment plate 69 of the head portion attachment body 43. Furthermore, a plurality of attachment holes 81 formed around the opening 57 for attaching the base plate 78 to the attachment plate 69 are formed on a circumference centered on the center of the attachment plate 69 (attachment member 70). More specifically, three attachment holes 81 are formed at radially symmetrical positions on the attachment plate 69 with respect to the center of the attachment plate 69, sandwiching the opening 57 (attachment member 70). The base plate 78 is attached to the attachment plate 69 by bolts 82 inserted through a pair of corresponding attachment holes 81 in the radial direction of the attachment plate 69 and nuts (not shown) screwed onto the bolts 82. Therefore, in this other embodiment, the angle of inclination of the cutting edge 36a of the blade 36 relative to the traveling direction A1 can be changed in three stages.

[0104] 23 and 25, the stopper 79 is formed from a plate material and is fixed to the lower surface of the base plate 78 in a downwardly protruding manner. The lower part of the stopper 79 serves as a contact part 79a against which the upper part of the blade 36 contacts from behind.

[0105] 23, the mounting portion of the base plate 78 to which the mounting plate 69 is attached is disposed between the first portions 75a of the pair of side plates 75. The pivot portions 78a that pivotally support the pivotally supported portions 75d of the side plates 75 are provided on both sides of the mounting portion of the base plate 78 to which the mounting plate 69 is attached in the blade longitudinal direction E1, so as to protrude downward.

[0106] 22, the pivoted portion 75d is pivotally supported on the pivoting portion 78a via a rotation shaft 60 so as to be rotatable about the rotation shaft 60. Note that the rotation shaft 60 has an axis parallel to the cutting edge 36a of the blade 36, as in the above embodiment.

[0107] The spring hook plate 80 is fixed onto the base plate 78. More specifically, as shown in Fig. 24 , the spring hook plate 80 is arranged on the base plate 78 on the opposite side from the open hole 57 in the direction (D1 direction) perpendicular to the blade longitudinal direction E1 in a plan view, and is fixed to the base plate 78 with bolts (not shown). More specifically, as shown in Figs. 22 and 25 , the spring hook plate 80 is provided with two rows of a plurality of (six in the illustrated example) bolt insertion holes 83 formed side by side at intervals in the D1 direction, and the spring hook plate 80 is attached to the base plate 78 so that its position in the D1 direction can be adjusted by bolts selectively inserted into the bolt insertion holes 83 and nuts screwed onto the bolts.

[0108] 22, an extending wall 80a is provided at the end of the spring hook plate 80 opposite the opening 57, and a spring hook portion 84 is provided at the top of the extending wall 80a. The spring hook portion 84 corresponds to the spring hook portion of the side plate 75 in the D1 direction, and a tension spring (biasing member) 85 is hung between the spring hook portion 76 and the spring hook portion 84. The biasing force of the tension spring 85 acts in a direction that presses the upper portion of the blade 36 against the abutment portion 79a of the stopper 79. The biasing force of the tension spring 85 can be adjusted by adjusting the mounting position of the spring hook plate 80 relative to the base plate 78 in the D1 direction.

[0109] The overload avoidance mechanism 56 in this other embodiment is configured to include the stopper 79 and the pair of tension springs 85. In this overload avoidance mechanism 56, the blade 36 is pressed against the stopper 79, thereby restricting the rotation of the blade 36 about the rotation axis 60, and when an overload is applied to the blade 36, the load received by the blade 36 causes the blade 36 to extend the tension spring 85 and move away from the stopper 79, thereby allowing the blade 36 to rotate about the rotation axis 60.

[0110] In other words, the rotation of the blade 36 is restricted by the tension spring 85 and the stopper 79, and when a force acts on the tip of the blade 36 and the moment of that force around the rotation axis 60 is greater than the moment due to the force of the tension spring 85 (exceeds the threshold), the blade 36 moves away from the stopper 79 and rotates around the rotation axis 60.

[0111] In the overload avoidance mechanism 56 of this other embodiment, the force acting on the tip of the blade 36 is released by the extension of the tension spring 85, so that the force can be released gradually according to the magnitude of the overload. Note that the overload avoidance mechanism 56 of the above embodiment has the advantage of being strong against external factors such as rain.

[0112] The other configurations of this other embodiment are substantially the same as those of the above embodiment.

[0113] The weeding device 4 of this embodiment is a weeding device 4 installed on a ridge coating machine 3 that moves through a field 7 along an original ridge 5, digging up the soil and tamping the excavated soil to form a new ridge 6, and is equipped with a blade 36 made of a board material that scrapes the soil on the upper surface 5a of the original ridge 5 prior to the formation of the new ridge 6.

[0114] According to this configuration, weeding is performed on the upper surface 5a of the original ridge 5 prior to the formation of the new ridge 6 by scraping the soil on the upper surface 5a of the original ridge 5 with a blade 36 formed from a board material, so that even if tall weeds grow thickly on the upper surface 5a of the original ridge 5, the weeds can be prevented from becoming entangled in the weeding device 4.

[0115] The blade 36 also has a cutting edge 36a that scrapes the soil on the upper surface 5a of the base ridge 5 by moving along the traveling direction A1 of the ridge coating machine 3.

[0116] This configuration also makes it possible to prevent weeds from becoming entangled in the weeding device 4.

[0117] The cutting edge 36a is inclined with respect to the direction of travel A1.

[0118] According to this configuration, the soil on the upper surface 5a of the base ridge 5 can be scraped away while reducing the resistance from the soil.

[0119] In addition, the blade 36 is arranged at an angle that transitions in the opposite direction to the traveling direction A1 of the ridge coating machine 3 as it moves from the outside 5A of the original ridge 5 to the inside 5B, and guides the scraped soil to the inside 5B of the original ridge 5.

[0120] According to this configuration, the soil and grass scraped off by the blade 36 can be mixed with the soil of the field 7.

[0121] In addition, the blade 36 is arranged at an angle that transitions in the opposite direction to the traveling direction A1 of the ridge coating machine 3 as it moves from the inside 5B of the original ridge 5 to the outside 5A, and guides the scraped soil to the outside 5A of the original ridge 5.

[0122] This configuration can be used in cases where the soil and grass scraped off by the blade 36 should not be allowed to enter the field 7.

[0123] The weeding device 4 also includes a head portion 37 including a blade 36, and a head portion support 38 that supports the head portion 37 and is attached to the frame 8 of the furrow coating machine 3, and the head portion 37 is attached to the head portion support 38 so that the cutting edge 36a of the blade 36 is inclined with respect to the traveling direction A1.

[0124] This configuration also makes it possible to scrape away the soil on the upper surface 5a of the base ridge 5 while reducing the resistance from the soil.

[0125] The head portion 37 also has a blade support 42 on which the blade 36 is supported, and a head portion mounting body 43 attached to the head portion support body 38, and the blade support body 42 is attached to the head portion mounting body 43 so that the inclination angle of the cutting edge 36a of the blade 36 relative to the traveling direction A1 can be changed.

[0126] With this configuration, the angle of inclination of the cutting edge 36a can be changed according to the resistance of the soil, etc.

[0127] In addition, the blade 36 is supported on the blade support 42 so that it can rotate freely around the rotation axis 60, and the blade support 42 has an overload avoidance mechanism 56, which has biasing members 64, 85 that restrict the rotation of the blade 36 around the rotation axis 60 by the biasing force of the biasing members 64, 85, and allows the blade 36 to rotate around the rotation axis 60 against the biasing force of the biasing member when an overload acts on the blade 36.

[0128] According to this configuration, damage to the weeding device 4 and the ridge coating device 3 can be prevented.

[0129] The head portion 37 also has a blade mounting body 44 to which the blade 36 is attached and which is supported on the blade support 42 so as to be rotatable about a rotation axis 60, the blade mounting body 44 having a holding portion 51, and the overload avoidance mechanism 56 having a ball 66 that fits into the holding portion 51 and a compression spring 64 that is a biasing member that presses the ball 66 against the holding portion 51, the ball 66 fitting into the holding portion 51 restricts rotation of the blade mounting body 44 about the rotation axis 60, and when an overload is applied to the blade 36, the load that the ball 66 receives from the holding portion 51 compresses the compression spring 64 and causes it to come off the holding portion 51, allowing rotation of the blade mounting body 44 about the rotation axis 60.

[0130] This configuration also makes it possible to prevent the weeding device 4 and the ridge coating device 3 from being damaged.

[0131] In addition, the overload avoidance mechanism 56 has a stopper 79 provided on the blade support 42 and a tension spring 85 which is a biasing member that presses the blade 36 against the stopper 79. When the blade 36 is pressed against the stopper 79, the rotation of the blade 36 around the rotation axis 60 is restricted, and when an overload is applied to the blade 36, the load received by the blade 36 causes the blade 36 to stretch the tension spring 85 and move away from the stopper 79, thereby allowing the blade 36 to rotate around the rotation axis 60.

[0132] This configuration also makes it possible to prevent the weeding device 4 and the ridge coating device 3 from being damaged.

[0133] In addition, the height of the blade 36 relative to the base ridge 5 is adjustable.

[0134] With this configuration, the height of the blade 36 can be set according to the height of the base ridge 5, the condition of the grass roots, etc.

[0135] The head support 38 is attached to the machine frame 8 so that its position can be adjusted in the vertical direction, and the height of the blade 36 relative to the base ridge 5 can be adjusted by adjusting the vertical position of the head support 38.

[0136] According to this configuration, the height of the blade 36 can be adjusted independently of the ridge coating machine 3.

[0137] In addition, the head portion 37 can be removed from the head portion support 38 and held in the machine frame 8.

[0138] According to this configuration, the head unit 37 can be stored in the ridge coating machine 3 when ridge coating work is not being performed.

[0139] The ridge forming machine 1 of this embodiment is equipped with a ridge coating machine 3 that moves through the field 7 along the original ridge 5, digging up soil and tamping the excavated soil to form a new ridge 6, and a weeding device 4 attached to the ridge coating machine 3, which is formed from a plate material and has a blade 36 that scrapes the soil on the upper surface 5a of the original ridge 5 prior to the formation of the new ridge 6.

[0140] According to this configuration, weeding is performed on the upper surface 5a of the original ridge 5 prior to the formation of the new ridge 6 by scraping the soil on the upper surface 5a of the original ridge 5 with a blade 36 formed from a board material, so that even if tall weeds grow thickly on the upper surface 5a of the original ridge 5, the weeds can be prevented from becoming entangled in the weeding device 4.

[0141] The furrow coating machine 3 has a machine frame 8 attached to the traveling vehicle 2, and a first mounting part 26 and a second mounting part 27 provided on the machine frame 8, and the weeding device 4 has a head part support 38 attached to the first mounting part 26, and a head part 37 attached to the head part support 38 and including a blade 36, and the head part 37 can be removed from the head part support 38 and attached to the second mounting part 27.

[0142] According to this configuration, the head unit 37 can be stored in the ridge coating machine 3 when ridge coating work is not being performed.

[0143] The head support 38 is attached to the first mounting portion 26 so that its position can be adjusted in the vertical direction.

[0144] According to this configuration, the height of the blade 36 can be set according to the condition of the grass roots, etc., and the height of the blade 36 can be adjusted independently of the ridge coating machine 3.

[0145] Although one embodiment of the present invention has been described above, the embodiment disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0146] 2. Vehicles in operation 3 Ridge coating machine 4 Weeding equipment 5 Motomo 5a Top side 5A Outside of the original ridge 5B Inside the original ridge 6 Shinwa 7. Field 8 machine frame 26 First mounting part 27 Second mounting part 36 blades 36a cutting edge 37 Head 38 Head support 42 Blade support 43 Head mounting body 44 Blade mounting body 51 Holding part 56 Overload avoidance mechanism 60 Rotating Axis 64 Compression spring (biasing member) 66 balls 79 Stopper 85 Tension spring (biasing member) A1 Direction of travel

Claims

1. A weeding device provided on a ridge-plastering machine that moves along an original ridge in a field, digs up soil, and tamps and compacts the excavated soil to form a new ridge, A weeding device formed from a board and equipped with a blade that scrapes the soil on the top surface of the original ridge prior to the formation of the new ridge.

2. The weeding device according to claim 1, wherein the blade has a cutting edge that scrapes the soil on the top surface of the base ridge by moving along the traveling direction of the ridge coating machine.

3. The weeding device according to claim 2 , wherein the cutting edge is inclined with respect to the traveling direction.

4. The weeding device described in claim 1, wherein the blade is arranged in an inclined manner so that it moves in the opposite direction to the direction of travel of the ridge coating machine as it moves from the outside to the inside of the base ridge, and guides the scraped soil to the inside of the base ridge.

5. The weeding device described in claim 1, wherein the blade is arranged in an inclined manner that transitions in the opposite direction to the direction of travel of the ridge coating machine as it moves from the inside to the outside of the base ridge, and guides the scraped soil to the outside of the base ridge.

6. a head portion including the blade; a head unit support body that supports the head unit and is attached to a machine frame of the ridge coating machine; Equipped with The weeding device according to claim 2, 4 or 5, wherein the head portion is attached to the head portion support body so that the cutting edge of the blade is inclined with respect to the traveling direction.

7. the head portion includes a blade support body that supports the blade, and a head portion attachment body that is attached to the head portion support body, The weeding device according to claim 6, wherein the blade support is attached to the head attachment body so as to change the inclination angle of the cutting edge of the blade relative to the traveling direction.

8. The blade is supported by the blade support so as to be rotatable about a rotation axis, The blade support has an overload prevention mechanism; The weeding device according to claim 7, wherein the overload avoidance mechanism has a biasing member that restricts rotation of the blade about the pivot axis by the biasing force of the biasing member, and allows the blade to rotate about the pivot axis against the biasing force of the biasing member when an overload acts on the blade.

9. the head portion has a blade mounting body to which the blade is attached and which is supported by the blade support body so as to be rotatable about the rotation axis, The blade mounting body has a holding portion, The weeding device described in claim 8, wherein the overload avoidance mechanism has a ball that fits into the holding portion and a compression spring that is the biasing member that presses the ball against the holding portion, and when an overload is applied to the blade, the load that the ball receives from the holding portion compresses the compression spring and causes the ball to come off the holding portion, thereby allowing the blade attachment body to rotate about the rotation axis.

10. The overload avoidance mechanism has a stopper provided on the blade support and a tension spring as the biasing member that presses the blade against the stopper. The weeding device of claim 8, wherein the blade is pressed against the stopper to restrict rotation of the blade around the rotation axis, and when an overload is applied to the blade, the load received by the blade causes the blade to extend the tension spring and move away from the stopper, thereby allowing rotation of the blade around the rotation axis.

11. The weeding device according to claim 1 , wherein the blade is adjustable in height relative to the foot ridge.

12. the head support is attached to the machine frame so that its position can be adjusted in the up and down direction, The weeding device according to claim 6, wherein the height of the blade relative to the base ridge can be adjusted by adjusting the vertical position of the head portion support.

13. The weeding device according to claim 6, wherein the head portion is detachable from the head portion support and can be held on the machine frame.

14. a ridge-plastering machine that moves along the original ridge in the field, digging up the soil and tamping the excavated soil to form a new ridge; a weeding device attached to the ridge application machine, the weeding device being formed of a plate material and having a blade that scrapes the soil on the top surface of the original ridge prior to the formation of the new ridge; A ridge forming machine equipped with the above.

15. The ridge coating machine has a machine frame attached to a traveling vehicle, and a first mounting portion and a second mounting portion provided on the machine frame, The weeding device is a head support attached to the first mounting portion; a head attached to the head support and including the blade; The ridge forming machine according to claim 14, wherein the head portion is detachable from the head portion support and attachable to the second mounting portion.

16. The ridge forming machine according to claim 15, wherein the head portion support is attached to the first mounting portion so that its position can be adjusted in the vertical direction.

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