Seedling transplanter

Abstract

To provide a seedling transplanter capable of performing a normal planting operation by suppressing the vibration and rattle of a transplant mechanism.SOLUTION: A rice transplanter 1, which is an example of a seedling transplanter, comprises: a transplant mechanism 32 that plants seedlings by rotating; a power transmission mechanism 20 that transmits rotation power from an engine 11, which serves as a power source, to the transplant mechanism 32; a planting distance change gear 27 that is an acceleration / deceleration device for accelerating / decelerating a rotational speed of the rotation power transmitted to the transplant mechanism 32 from the engine 11; and a resistance application mechanism 45 that applies predetermined resistance to the rotation power transmitted to the transplant mechanism 32.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a seedling transplanter such as a rice transplanter equipped with a transplanting mechanism that plants seedlings by rotating. [Background technology]

[0002] Conventionally, seedling transplanters such as rice transplanters are equipped with a traveling body and a planting machine attached to the traveling body, and the planting machine is equipped with a transplanting mechanism that rotates along a field or the like to plant seedlings. The traveling body and the planting machine of the rice transplanter are driven according to the power transmitted from a power source such as an engine, in other words, the power to the traveling body and the power to the planting machine are linked. Therefore, when the traveling speed of the traveling body is increased, the driving speed of the planting machine, for example, the rotation speed of the transplanting mechanism, increases.

[0003] For example, the rice transplanter disclosed in Patent Document 1 is equipped with a seedling planting device supported on a running part, and a plant spacing variable speed device that transmits power to the seedling planting device and can change the working speed of the seedling planting device in relation to the running speed of the running part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-171285 A Summary of the Invention [Problem to be solved by the invention]

[0005] A seedling transplanter such as a rice transplanter can increase the planting speed by changing the power transmitted to the transplanting mechanism and increasing the rotation speed of the transplanting mechanism, and can assist in scraping and planting of seedlings by accelerating or decelerating the rotation speed of the driving force transmitted to the transplanting mechanism. For example, in a rice transplanter, a variable speed gear is used in the power transmission mechanism that transmits the rotational power to the transplanting mechanism, and the rotation of the transplanting mechanism is accelerated or decelerated by rotating the transplanting mechanism with the variable speed gear.

[0006] In addition, in rice transplanters, the planting tines, which scrape and plant the seedlings, are rotatably attached to the transplanting mechanism, and the rotating shaft of the transplanting mechanism and the rotating shaft of the planting tines are connected via gears, so that the planting tines rotate in accordance with the power that rotates the transplanting mechanism.

[0007] If the traveling speed of the traveling machine body is increased, the rotation speed of the transplanting mechanism increases, causing vibrations, which may prevent normal planting work, and may cause problems such as damage to each component of the transplanting mechanism and noise generation. In addition, in the case of dense planting with narrow spacing between seedlings (when there are many seedlings per tsubo), the rotation speed of the transplanting mechanism can be high, but in the case of sparse planting with wide spacing between seedlings (when there are few seedlings per tsubo), the rotation speed of the transplanting mechanism is reduced to widen the planting interval. If the rotation speed of the transplanting mechanism is reduced, the range in which the planting claws come into contact with the ground at the scraping position or planting position becomes longer in the traveling direction, making normal planting work impossible. In order to shorten the range in which the planting claws come into contact with the ground, the transplanting mechanism may be accelerated or decelerated according to the scraping position or planting position. Furthermore, when sparse planting is performed by increasing the traveling speed of the traveling machine body, accelerating or decelerating the transplanting mechanism may cause rattles in each component of the transplanting mechanism, making it impossible to perform normal planting work.

[0008] An object of the present invention is to provide a seedling transplanter that suppresses vibration and rattle of the transplanting mechanism and enables normal planting work. [Means for solving the problem]

[0009] In order to solve the above problems, the seedling transplanter of the present invention is characterized in that it comprises a transplanting mechanism that plants seedlings by rotating, a power transmission mechanism that transmits rotational power from a power source to the transplanting mechanism, an acceleration / deceleration device that accelerates / decelerates the rotational speed of the rotational power from the power source, and a resistance imparting mechanism that imparts a predetermined resistance to the rotational power transmitted to the transplanting mechanism. Effect of the Invention

[0010] According to the present invention, there is provided a seedling transplanter capable of suppressing vibration and rattle of the transplanting mechanism regardless of the speed and enabling normal planting work. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a left side view showing a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Diagram 2] FIG. 1 is a front view showing a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Diagram 3] FIG. 2 is a top view showing a power transmission mechanism in the rice transplanter according to the first embodiment of the seedling transplanter of the present invention. [Figure 4] FIG. 1 is a perspective view showing a part of a planting implement in a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Diagram 5] FIG. 2 is a perspective view showing a planting transmission case and a transplanting mechanism of a planting work machine in a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Figure 6] FIG. 1 is a perspective view showing a planting transmission case of a planting work machine in a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Figure 7] FIG. 2 is a cross-sectional view showing from above a planting transmission case of a planting work machine in the rice transplanter according to the first embodiment of the seedling transplanter of the present invention. [Figure 8] FIG. 2 is a cross-sectional view showing from above the resistance imparting mechanism of a planting implement in a rice transplanter according to the first embodiment of the seedling transplanter of the present invention. [Figure 9] 4 is a graph showing torque associated with the transplanting mechanism of the planting work machine in the rice transplanter according to the first embodiment of the seedling transplanter of the present invention. [Figure 10] FIG. 1 is a side view showing a transplanting mechanism of a planting work machine in a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Figure 11] FIG. 2 is a cross-sectional side view showing a transplanting mechanism of a planting work machine in a rice transplanter according to a first embodiment of the seedling transplanter of the present invention. [Figure 12] 4 is a graph showing torque associated with the transplanting mechanism of the planting work machine in the rice transplanter according to the first embodiment of the seedling transplanter of the present invention. [Figure 13]FIG. 11 is a side view showing a resistance applying mechanism of a planting implement in a rice transplanter according to a second embodiment of the seedling transplanter of the present invention. [Figure 14] FIG. 11 is a side view showing a cam member provided in the transplanting mechanism in the resistance imparting mechanism of the planting work machine in the rice transplanter according to the third embodiment of the seedling transplanter of the present invention. [Figure 15] FIG. 11 is a schematic diagram showing the rotation trajectory of the transplanting mechanism of the planting work machine in the rice transplanter according to the third embodiment of the seedling transplanter of the present invention. [Figure 16] 13 is a perspective view showing the planting transmission case and transplanting mechanism of the planting work machine in the rice transplanter according to the fourth embodiment of the seedling transplanter of the present invention, and the resistance imparting mechanism. FIG. [Figure 17] 13 is a cross-sectional view showing from above the planting transmission case and resistance imparting mechanism of a planting work machine in a rice transplanter according to a fourth embodiment of the seedling transplanter of the present invention. FIG. [Figure 18] FIG. 11 is a cross-sectional side view showing the resistance imparting mechanism of a rice transplanter according to a fourth embodiment of the seedling transplanter of the present invention. [Figure 19] FIG. 11 is an exploded oblique view showing a part of a connecting member and a part of a friction member in a resistance imparting mechanism of a rice transplanter according to a fourth embodiment of the seedling transplanter of the present invention. [Figure 20] 13 is a rear view showing the resistance applying case and the biasing member in the resistance applying mechanism of the rice transplanter according to the fourth embodiment of the seedling transplanter of the present invention. FIG. [Figure 21] 13 is an oblique view showing a resistance applying case and a biasing member in a resistance applying mechanism of a rice transplanter according to a fourth embodiment of the seedling transplanter of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A rice transplanter 1, which is a first embodiment of the seedling transplanter of the present invention, will be described with reference to the drawings. As shown in Fig. 1, the rice transplanter 1 includes a traveling body 2 and a planting machine 3 attached to the rear of the traveling body 2, and is configured to perform a planting operation of seedlings using the planting machine 3 while traveling using the traveling body 2.

[0013] As shown in Figures 1 and 2, the running body 2 comprises a body frame 10, an engine 11 and a transmission 12 which are power sources attached to the front of the body frame 10 near the center in the left-right direction, a pair of front wheels 13 which are rotatably attached to the front of the body frame 10 at both left-right ends, and a pair of rear wheels 14 which are rotatably attached to the rear of the body frame 10 at both left-right ends.

[0014] The traveling machine body 2 is provided with a driver's seat 15 near the center on the machine body frame 10, and driving operation tools such as a steering wheel 16 and a main shift lever are provided around the driver's seat 15. The traveling machine body 2 is provided with a step 17 and a spare seedling tray 18 on the machine body frame 10.

[0015] The engine 11 generates rotational power to drive each component, and is covered from above by a bonnet 21 which is attached to the top of the vehicle frame 10 while covering the engine 11.

[0016] The transmission 12 is connected to the engine 11, and transmits the power of the engine 11 at a variable speed to a pair of front wheels 13 and a pair of rear wheels 14. The pair of front wheels 13 and the pair of rear wheels 14 are driven to rotate in response to the power transmitted from the engine 11 and the transmission 12, causing the traveling machine body 2 to travel forward or backward. In addition, the pair of front wheels 13 are steered in response to the operation of a steering handle 16 to steer the traveling machine body 2.

[0017] The steering handle 16 is disposed behind the bonnet 21 in front of the driver's seat 15, and configured to transmit the rotation of the steering handle 16 by the operator to the pair of front wheels 13. The main speed change lever is disposed to the left of the steering handle 16, and transmits the speed change operation by the operator to the transmission 12 to change the set travel speed of the rice transplanter 1.

[0018] A link device 22 is rotatably attached to the rear of the traveling body 2, and the planting work machine 3 is attached to the rear end of the link device 22. The planting work machine 3 can be raised and lowered by rotating the link device 22 with a hydraulic cylinder.

[0019] In addition, front axle devices are attached to the left and right sides of the transmission 12, and a pair of front wheels 13 are attached to each front axle device. As shown in Fig. 3, a front end of a joint material 23 is attached to the rear part of the transmission 12, a rear axle device 24 is attached to the rear end of the joint material 23, and a pair of rear wheels 14 are attached to the rear axle device 24.

[0020] A rear-wheel drive shaft 25 is provided between the transmission 12 and the rear axle device 24 to transmit power generated by the engine 11 from the transmission 12 to the rear axle device 24, and the rear-wheel drive shaft 25 transmits rotational power to the pair of rear wheels 14 via gears or the like. A rotor drive shaft 26 is provided between the rear axle device 24 and the planting implement 3 to transmit power from the rear axle device 24 to a ground leveling rotor of the planting implement 3.

[0021] In addition, an inter-row transmission 27 is attached to the rear axle device 24, and a first power transmission shaft 28 is provided between the transmission 12 and the inter-row transmission 27 for transmitting the power generated by the engine 11 from the transmission 12 to the inter-row transmission 27.

[0022] A second power transmission shaft 29 is provided between the inter-row transmission 27 and the planting machine 3 to transmit power from the inter-row transmission 27 to a center case 33 of the planting machine 3. The rotational power of the first power transmission shaft 28 has its rotational speed changed by a gear or the like built into the inter-row transmission 27 and is transmitted to the second power transmission shaft 29. The second power transmission shaft 29 is disposed rotatably about a rotation axis that is long in the approximately front-rear direction.

[0023] The steps 17 are formed in a flat shape to serve as footholds for an operator, and are provided on the machine frame 10 from between the bonnet 21 and the driver's seat 15 to both the left and right sides of the bonnet 21 and the driver's seat 15. That is, the left step 17 and the right step 17 are provided integrally.

[0024] The spare seedling trays 18 are provided adjacent to the step 17, and a plurality of spare seedling trays 18 are attached at intervals in the vertical direction to spare seedling tray frames 19 erected on the machine frame 10 or the step 17 on both the left and right sides of the bonnet 21. Seedling mats to be replenished to the seedling carrier 30 of the planting machine 3 are placed on the spare seedling trays 18.

[0025] The planting work machine 3 is equipped with a seedling carrier 30 for placing a seedling mat and a main frame 31 for mounting multiple (e.g., eight) transplanting mechanisms 32 spaced apart in the left-right direction for picking and planting the seedlings.

[0026] As shown in Figure 4, the main frame 31 has a shape long in the left-right direction, a center case 33 is attached to the left-right center of the main frame 31, and half of the planting transmission cases 34 of the transplanting mechanism 32 are attached at intervals in the left-right direction to the rear of the main frame 31. As shown in Figures 5 and 6, each planting transmission case 34 has a shape long in the front-rear direction and extends rearward from the main frame 31, and the transplanting mechanisms 32 are rotatably attached to both the left and right sides of the rear of each planting transmission case 34.

[0027] A planting drive shaft 35 for transmitting the rotational power from the second power transmission shaft 29 to each planting transmission case 34 is rotatably supported in the center case 33. The planting drive shaft 35 has a shape that is long in the left-right direction across the mounting width of each planting transmission case 34, and is arranged to be rotatable around a rotation axis that is long in the left-right direction. The planting drive shaft 35 is connected to the second power transmission shaft 29 via a gear or the like provided in the center case 33, and the center case 33 is configured to rotate the planting drive shaft 35, which has a different rotation direction, according to the rotational power transmitted from the second power transmission shaft 29.

[0028] As shown in FIG. 7, each planting transmission case 34 rotatably supports a planting transmission shaft 36 and a planting central shaft 37 for transmitting the rotational power from the planting drive shaft 35 to the transplanting mechanism 32. The planting transmission shaft 36 has a long shape over the length of each planting transmission case 34 in the front-rear direction, and is arranged to be rotatable around a rotation axis that is long in the front-rear direction. The planting transmission shaft 36 is a planting transmission member that transmits power in the direction from the engine 11 side toward the transplanting mechanism 32 side, i.e., rearward, and is arranged in front of the planting central shaft 37. The planting central shaft 37 has a long shape that protrudes on both the left and right sides of the rear of each planting transmission case 34, and is arranged to be rotatable around a rotation axis that is long in the left-right direction. The rear of the planting transmission case 34, where the planting central shaft 37 is located, is open on both the left and right sides, and the left and right openings of the planting transmission case 34 are each closed by a case lid 38, with the planting central shaft 37 penetrating the left and right case lids 38 and protruding to both the left and right sides.

[0029] The planting drive shaft 35 is connected to the planting transmission shaft 36 via gears or the like provided in each planting transmission case 34, and each planting transmission case 34 is configured to rotate the planting transmission shaft 36 with a different rotation direction according to the rotational power transmitted from the planting drive shaft 35. The planting transmission shaft 36 is connected to the planting central shaft 37 via gears or the like provided in each planting transmission case 34, and each planting transmission case 34 is configured to rotate the planting central shaft 37 with a different rotation direction according to the rotational power transmitted from the planting transmission shaft 36. For example, a first bevel gear 39 is attached to the rear end of the planting transmission shaft 36, and a second bevel gear 40 meshing with the first bevel gear 39 is attached near the center of the planting central shaft 37, so that the planting central shaft 37 rotates according to the rotational power of the planting transmission shaft 36.

[0030] A transplanting mechanism 32 is attached to both the left and right ends of the planting central shaft 37 protruding from both the left and right sides of each planting transmission case 34, and the transplanting mechanism 32 rotates integrally with the planting central shaft 37 in response to the rotational power that rotates the planting central shaft 37.

[0031] As shown in FIG. 8, a disk-shaped friction plate 41 is provided around one side of the planting central shaft 37 in the left-right direction so as to rotate together with the planting central shaft 37, and the friction plate 41 is arranged in the planting transmission case 34 close to the inner wall of the planting transmission case 34 in the left-right direction (for example, the inner wall of the case lid 38). In addition, a pressing member 42 such as a steel plate for contacting and pressing the friction plate 41 is arranged close to the friction plate 41 around the planting central shaft 37. A biasing member 43 such as a disc spring or coil spring for biasing the pressing member 42 against the friction plate 41 is arranged around the planting central shaft 37 on the opposite side of the pressing member 42 to the friction plate 41 in the left-right direction. A biasing support member 44 for supporting the biasing member 43 is arranged around the planting central shaft 37 on the opposite side of the pressing member 42 to the biasing member 43 in the left-right direction.

[0032] The pressing member 42 presses the friction plate 41 to generate a friction force between the pressing member 42 and the friction plate 41, thereby suppressing the rotation of the friction plate 41. This suppresses the rotation of the planting central shaft 37, and provides resistance to the rotational power transmitted from the planting central shaft 37 to the transplanting mechanism 32.

[0033] For example, the inner wall of the case lid 38 of the planting transmission case 34 is formed with a concave cross section, and the friction plate 41 is accommodated in the concave portion of the case lid 38 and arranged so as to be close to the inner wall of the case lid 38. In addition, the pressing member 42 and the urging member 43 are also accommodated in the concave portion of the case lid 38, and the urging support member 44 is attached so as to close the concave portion of the case lid 38. The friction plate 41 is pressed by the pressing member 42 and is pressed by the pressing member 42 to be pressed against the inner wall of the case lid 38. As a result, the friction plate 41 is sandwiched between the pressing member 42 and the case lid 38, thereby improving the friction force. In addition, since only the pressing member 42 is required as a member for sandwiching the friction plate 41, the number of parts can be reduced.

[0034] Incidentally, the above-mentioned transmission 12, first power transmission shaft 28, inter-plant speed change device 27, second power transmission shaft 29, center case 33, planting drive shaft 35, planting transmission case 34, planting transmission shaft 36 and planting central shaft 37 constitute the power transmission mechanism 20 that transmits rotational power to the transplanting mechanism 32. When the transmission 12 increases the running speed of the traveling body 2, the rotational speed of the rotational power transmitted by the power transmission mechanism 20 to the transplanting mechanism 32 is also increased.

[0035] The transplanting mechanism 32 rotates around the planting central shaft 37 in response to the rotational power of the planting central shaft 37, causing the planting claws 51 of the transplanting mechanism 32 to rotate around the planting central shaft 37. At this time, the planting claws 51 rotate in response to the rotation of the transplanting mechanism 32, passing through a scraping position where the seedlings are scraped off the seedling mat of the seedling carrier 30 and a planting position where the seedlings are planted in the field (see FIG. 15).

[0036] The plant spacing transmission 27 changes the rotation speed of the transplanting mechanism 32 by changing the rotation speed of the rotational power transmitted to the transplanting mechanism 32 by the power transmission mechanism 20, thereby changing the spacing between the seedlings planted by the transplanting mechanism 32. In addition, when performing sparse planting with wide spacing between plants, the plant spacing transmission 27 functions as an acceleration / deceleration device that accelerates and decelerates the rotation speed of the rotational power transmitted to the transplanting mechanism 32 in accordance with the scraping position and the planting position. In addition, the first bevel gear 39 and the second bevel gear 40 provided in the planting transmission case 34 may also be configured to function as an acceleration / deceleration device that accelerates and decelerates the rotation speed of the transplanting mechanism 32. For example, in the rotation trajectory of the planting claw 51 caused by the rotation of the transplanting mechanism 32, the transplanting mechanism 32 is accelerated in the section before and after the planting claw 51 passes through the scraping position and the section immediately before it reaches the planting position as the acceleration section, and the transplanting mechanism 32 is decelerated in the other sections as the deceleration section.

[0037] FIG. 9 is a graph showing the relationship between the rotation angle of the transplanting mechanism 32 and the torque related to the transplanting mechanism 32. In FIG. 9, the outline of the change in the rotation speed of the transplanting mechanism 32 is shown by a dotted line. As shown by the dashed line in FIG. 9, the torque relative to the rotational power transmitted from the planting central shaft 37 to the transplanting mechanism 32 periodically decreases or increases according to the rotation of the transplanting mechanism 32. If torque fluctuation occurs in the rotational power to the transplanting mechanism 32 and the torque falls significantly below zero, vibrations will occur in the transplanting mechanism 32, making it impossible to carry out normal planting work, and each member of the transplanting mechanism 32 may be damaged or the transplanting mechanism 32 may generate noise.

[0038] However, in the first embodiment, the case cover 38, planting central shaft 37, friction plate 41, pressing member 42, biasing member 43, and biasing support member 44 of the planting transmission case 34 constitute a resistance applying mechanism 45 that applies a predetermined resistance to the rotational power transmitted from the planting central shaft 37 to the transplanting mechanism 32. In other words, the resistance applying mechanism 45 is a disc brake type that suppresses the rotation of the planting central shaft 37 and applies resistance to the rotational power to the transplanting mechanism 32, thereby increasing the torque related to the transplanting mechanism 32, as shown by the solid line in FIG.

[0039] If the resistance imparting mechanism 45 is not provided, there is a risk that the transplanting mechanism 32 will vibrate when the torque relative to the rotational power to the transplanting mechanism 32 fluctuates significantly below zero, as shown by the dashed line in Fig. 9. However, if the resistance imparting mechanism 45 is provided, the torque relative to the rotational power to the transplanting mechanism 32 increases by imparting resistance to the rotational power to the transplanting mechanism 32, so that even if the torque to the planting central shaft 37 decreases and the torque relative to the rotational power to the transplanting mechanism 32 decreases, the torque will not fall significantly below zero, as shown by the solid line in Fig. 9. This makes it possible to suppress vibration of the transplanting mechanism 32.

[0040] As shown in Fig. 5 and Fig. 10, the transplanting mechanism 32 includes a hollow rotor case 50 and two planting claws 51. The rotor case 50 is attached to the planting central shaft 37 of the planting transmission case 34 at approximately its center, and rotates together with the planting central shaft 37. For example, the planting central shaft 37 penetrates the side surface (inner side surface) of the rotor case 50 on the planting transmission case 34 side and is connected to the rotor case 50. The two planting claws 51 are rotatably attached to both ends of the rotor case 50 spaced apart from the planting central shaft 37 on the side surface (outer side surface) of the rotor case 50 opposite the planting transmission case 34.

[0041] As shown in Figure 11, a central gear 52 is rotatably arranged approximately in the center within the rotor case 50, connecting gears 53 that mesh with the central gear 52 are rotatably arranged on both ends of the central gear 52, and planting gears 54 that mesh with the connecting gear 53 are rotatably arranged further on both ends of the connecting gear 53.

[0042] Additionally, a planting rotation shaft 55 is rotatably attached within the rotor case 50, which is coaxial with each planting gear 54 and has an axial direction parallel to the planting central axis 37. Each planting gear 54 is circumferentially mounted on each planting rotation shaft 55 so as to rotate integrally with each planting rotation shaft 55. Each planting rotation shaft 55 penetrates the side (outer side) of the rotor case 50 opposite the planting transmission case 34 and protrudes outward, and two planting claws 51 are attached to each planting rotation shaft 55.

[0043] Each planting claw 51 includes a claw member 56 for holding a seedling and a push rod 57 for pushing out the seedling held by the claw member 56 in order to plant it. The claw member 56 and the push rod 57 may be arranged so as to protrude in the rotation direction of the transplanting mechanism 32. For example, the push rod 57 is stored inside the planting claw 51, and the planting claw 51 includes a push spring and a storage arm acting on the push rod 57. The push spring acts on the push rod 57 so as to protrude the push rod 57 by means of a biasing force. The storage arm is configured to operate between a storage position in which the push rod 57 acts on the push rod 57 to store the push rod 57 inside the planting claw 51 against the biasing force of the push spring, and a release position in which the action on the push rod 57 is released to release the resistance to the push spring.

[0044] In the transplanting mechanism 32, the rotor case 50 is rotatably mounted on the planting transmission case 34 and the case lid 38, while the central gear 52 is fixed to the planting transmission case 34 or the case lid 38. The central gear 52 is not attached to the planting central shaft 37, and for example, the planting central shaft 37 may pass through the central gear 52. As a result, when the planting central shaft 37 rotates, the rotor case 50 rotates integrally with the planting central shaft 37, i.e., the transplanting mechanism 32 rotates.

[0045] The rotational phase of the transplanting mechanism 32 is preset so that, as the transplanting mechanism 32 rotates, the two planting claws 51 rotate around the planting central axis 37 while alternately passing between the raking position and the planting position (see Figure 15).

[0046] On the other hand, even if the planting central shaft 37 rotates, the central gear 52 does not rotate integrally with the planting central shaft 37, but rotates relative to the rotor case 50 since it is fixed to the planting transmission case 34 or the case cover 38. Each connecting gear 53 rotates relative to the rotor case 50 with the rotation of the central gear 52, and each planting gear 54 rotates relative to the rotor case 50 with the rotation of each connecting gear 53. Furthermore, each planting rotation shaft 55 rotates integrally with the rotation of each planting gear 54, and each planting claw 51 rotates with the rotation of each planting rotation shaft 55. That is, the planting rotation shaft 55 and the planting claw 51 rotate relative to the rotation of the planting central shaft 37 and the transplanting mechanism 32.

[0047] In addition, a cam member 58 that stabilizes the position of the planting claws 51 when picking up seedlings relative to the planting rotation shaft 55 is provided around the rotor case 50. The cam member 58 rotates together with the planting rotation shaft 55.

[0048] The cam member 58 suppresses the rotation of the planting claw 51 so that the position of the planting claw 51 relative to the rotor case 50 is maintained (fixed) when the planting claw 51 passes through the scraping position, thereby eliminating any play in the planting claw 51 and stabilizing the scraping of the seedlings.

[0049] The cam member 58 is formed of a deformed elliptical plate cam, and one section of the outer circumference of the cam member 58 is formed by a suppression portion 58a where the radius of the cam becomes smaller from the position where the apex of the cam member 58 is exceeded. The suppression portion 58a of the rotating cam member 58 abuts against the suppression arm 59 provided on the planting claw 51, thereby suppressing the rotation of the cam member 58, thereby suppressing the rotation of the planting rotation shaft 55, and further suppressing the rotation of the planting claw 51. The cam member 58 is arranged with a rotation phase set so that the suppression portion 58a of the cam member 58 abuts against the suppression arm 59 in the rotation trajectory of the planting claw 51 caused by the rotation of the transplanting mechanism 32 before and after the planting claw 51 passes the scraping position.

[0050] For example, the transplanting mechanism 32 has a restraining arm 59 disposed on the opposite side of the rotation direction of the transplanting mechanism 32 with respect to the cam member 58 in the rotor case 50, and a restraining spring 60 disposed on the opposite side of the rotation direction of the transplanting mechanism 32 with respect to the restraining arm 59. The restraining arm 59 is in contact with the cam member 58 and is provided rotatably between a restraining position close to the planting rotation shaft 55 and a spaced position away from the planting rotation shaft 55. The restraining spring 60 is provided between the inner wall of the rotor case 50 and the restraining arm 59, and biases the restraining arm 59 toward the planting rotation shaft 55 against the inner wall of the rotor case 50, thereby pressing the cam member 58 with the restraining arm 59. The restraining spring 60 may have a biasing force substantially along the rotation trajectory of the planting rotation shaft 55 when the transplanting mechanism 32 rotates.

[0051] The torque for the rotational power transmitted to the planting rotation shaft 55 on which the cam member 58 is provided fluctuates in response to the pressure of the cam member 58 against the restraining arm 59. The fluctuation in the torque of the planting rotation shaft 55 is transmitted to the planting central shaft 37 via the planting gear 54, the connecting gear 53, and the central gear 52, and the torque for the rotational power transmitted to the planting central shaft 37, i.e., the torque related to the transplanting mechanism 32, fluctuates.

[0052] FIG. 12 shows a graph of the relationship between the rotation angle of the transplanting mechanism 32 and the torque related to the transplanting mechanism 32. In FIG. 12, the outline of the change in the rotation speed of the transplanting mechanism 32 is shown by a dotted line. The inertial torque related to the transplanting mechanism 32 by the rotational power transmitted from the power transmission mechanism 20 is shown by a solid line in FIG. 12, and the cam torque acting on the planting central shaft 37 by the cam member 58 is shown by a dashed line in FIG. 12. In addition, the transplanting mechanism 32 has another cam (not shown) that operates the pushing and storing of the push rod 57 of the planting claw 51, and the cam torque acting on the planting central shaft 37 by the other cam is shown by a two-dot chain line in FIG. 12. The total torque related to the transplanting mechanism 32 is shown by a dashed line in FIG. 12, as these cam torques act on the inertial torque. By adjusting the shape of the cam member 58, the total torque applied to the transplantation mechanism 32 can be adjusted to match a preset waveform, and as shown in Figure 12, the cam member 58 is configured to reduce the inertia torque applied to the transplantation mechanism 32 in a predetermined inhibition section.

[0053] As described above, according to the first embodiment, the rice transplanter 1, which is an example of a seedling transplanter, comprises a transplanting mechanism 32 that plants seedlings by rotating, a power transmission mechanism 20 that transmits rotational power from the engine 11, which is the power source, to the transplanting mechanism 32, an inter-row transmission 27, which is an acceleration / deceleration device that accelerates / decelerates the rotational speed of the rotational power transmitted from the engine 11 to the transplanting mechanism 32, and a resistance imparting mechanism 45 that imparts a predetermined resistance to the rotational power transmitted to the transplanting mechanism 32.

[0054] As a result, the rice transplanter 1 can suppress the rotation speed of the transplanting mechanism 32 even when the traveling speed of the traveling body 2 is increased by applying resistance to the rotational power to the transplanting mechanism 32, and the torque related to the transplanting mechanism 32 is adjusted so as not to fall significantly below zero, so that the vibration of the transplanting mechanism 32 can be suppressed. Therefore, abnormalities in the planting work caused by the vibration of the transplanting mechanism 32, damage to each member of the transplanting mechanism 32, and noise of the transplanting mechanism 32 can be suppressed. In particular, even when the rotation speed of the transplanting mechanism 32 is accelerated or decelerated by the inter-row transmission 27 when performing sparse planting work, rattles and vibrations generated in the transplanting mechanism 32 can be suppressed. Thus, according to the present invention, it is possible to provide the rice transplanter 1, which is a seedling transplanter capable of performing normal planting work by suppressing the vibration and rattle of the transplanting mechanism 32.

[0055] According to the first embodiment, in the rice transplanter 1, the power transmission mechanism 20 includes a planting central shaft 37 that rotates in response to the rotational power from the engine 11 to transmit the rotational power to the transplanting mechanism 32, and the transplanting mechanism 32 is supported by the planting central shaft 37. The resistance imparting mechanism 45 includes a friction plate 41 provided around the planting central shaft 37, a pressing member 42 pressed against the friction plate 41, and a biasing member 43 that biases the pressing member 42 against the friction plate 41. The resistance imparting mechanism 45 applies resistance to the rotational power transmitted to the transplanting mechanism 32 by the frictional force acting on the friction plate 41 by the pressing member 42.

[0056] As a result, in the rice transplanter 1, resistance can be applied to the rotational power transmitted to the transplanting mechanism 32 at a position in the power transmission mechanism 20 closer to the transplanting mechanism 32, and this can directly act on the torque fluctuation related to the transplanting mechanism 32. In addition, when the rotational power of the planting central shaft 37 is reduced to decelerate the rotation speed, the rotation of the transplanting mechanism 32 can be prevented from being preceded by the torque, and the delay in the response of the transplanting mechanism 32 to the deceleration can be reduced. Therefore, the transplanting mechanism 32 can be rotated to match the preset rotation phase of the transplanting mechanism 32.

[0057] In addition, when the urging member 43 is configured with a disc spring, the urging support member 44 needs to form a spring groove that holds the disc spring around the entire circumference of the planting central axis 37. In contrast, when the urging member 43 is configured with a coil spring, the coil spring may be provided at several locations around the planting central axis 37 at intervals. Therefore, the urging support member 44 only needs to form spring holes that hold the coil springs at several locations, which can improve the strength of the urging support member 44 and also can reduce the thickness of the bottom of the spring hole that supports the coil spring, thereby increasing the spring length (stroke amount) of the coil spring. This can suppress the decrease in the spring load by the urging member 43 when the friction plate 41 or the pressing member 42 wears.

[0058] According to another example of the first embodiment, the resistance imparting mechanism 45 of the rice transplanter 1 may be configured to be able to adjust the resistance imparted to the rotational power transmitted to the transplanting mechanism 32. The resistance imparting mechanism 45 makes it possible to adjust the urging force (spring load) of the urging member 43 against the pressing member 42, thereby making it possible to adjust the frictional force acting on the friction plate 41 by the pressing member 42 and the case lid 38. This makes it possible to adjust the degree of inhibition of the rotation of the friction plate 41, to adjust the degree of inhibition of the rotation of the planting central shaft 37, and to adjust the resistance of the rotational power transmitted from the planting central shaft 37 to the transplanting mechanism 32.

[0059] For example, the resistance imparting mechanism 45 uses the biasing support member 44 as an adjustment member to adjust the distance between the pressing member 42 and the biasing support member 44, thereby making it possible to adjust the extension length of the biasing member 43 and adjust the biasing force of the biasing member 43. A thread is cut on the inner peripheral surface of the concave portion of the case lid 38 that houses the friction plate 41, the pressing member 42, and the biasing member 43 to form a female thread, and a thread is cut on the outer peripheral surface of the biasing support member 44 to form a male thread. The biasing support member 44 is screwed into the case lid 38 and attached, and the degree of tightening of the biasing support member 44 relative to the case lid 38 is adjusted, making it possible to adjust the distance between the pressing member 42 and the biasing support member 44.

[0060] As described above, according to another example of the first embodiment, in the rice transplanter 1, the resistance applying mechanism 45 is configured to be able to adjust the resistance applied to the rotational power transmitted to the transplanting mechanism 32.

[0061] Specifically, the resistance applying mechanism 45 includes a biasing support member 44, which is an adjustment member arranged at a distance from the pressing member 42 on the opposite side to the friction plate 41. The biasing member 43 is arranged between the pressing member 42 and the biasing support member 44, and the biasing support member 44 is configured so that the distance between the biasing member 43 and the pressing member 42 can be adjusted.

[0062] As a result, in the rice transplanter 1, by making it possible to adjust the resistance of the rotational power to the transplanting mechanism 32, it is possible to more appropriately adjust the torque fluctuation related to the transplanting mechanism 32 and more appropriately suppress the vibration of the transplanting mechanism 32. Furthermore, when the friction plate 41 or the pressing member 42 wears and the frictional force decreases, the biasing force of the biasing member 43 can be increased by tightening the biasing support member 44, thereby increasing the frictional force.

[0063] In the above-described first embodiment, an example was described in which the resistance imparting mechanism 45 that imparts resistance to the rotational power to the transplanting mechanism 32 in the rice transplanter 1 is configured with the case cover 38 of the planting transmission case 34, the planting central shaft 37, the friction plate 41, the pressing member 42, the biasing member 43, and the biasing support member 44, but the present invention is not limited to this example. For example, in the second embodiment, as shown in FIG. 13, the resistance imparting mechanism 70 may be configured to suppress the rotation of the planting central shaft 37 by pressing a brake member 71 attached to the planting central shaft 37 against a brake housing 72. In other words, the resistance imparting mechanism 70 suppresses the rotation of the planting central shaft 37 by using a drum brake type to impart resistance to the rotational power to the transplanting mechanism 32. In the second embodiment, a description of the same configuration as in the first embodiment will be omitted.

[0064] The resistance applying mechanism 70 of the second embodiment is disposed on one side in the left-right direction of the planting central shaft 37, similar to the resistance applying mechanism 45 of the first embodiment described above. The resistance applying mechanism 70 includes a brake support member 73 that supports a brake member 71, and the brake support member 73 is provided around the planting central shaft 37 so as to rotate integrally with the planting central shaft 37.

[0065] The brake member 71 is disposed outside the brake support member 73 in the radial direction of the planting central shaft 37. The brake member 71 is rotatably attached to the brake support member 73 so as to rotate in the radial direction of the planting central shaft 37. The brake member 71 rotates integrally with the brake support member 73 and the planting central shaft 37. When the brake member 71 is in close proximity to the brake support member 73, the brake member 71 and the brake support member 73 are formed in a disk shape.

[0066] Between the brake member 71 and the brake support member 73, there is provided a biasing member 74 such as a coil spring that biases the brake member 71 radially outward from the planting central shaft 37. By providing a notch in the brake support member 73 and arranging the biasing member 74 in the notch, the spring length of the biasing member 74 can be increased.

[0067] The brake housing 72 is configured with a cylindrical portion capable of housing the brake member 71 and the brake support member 73, and the inner peripheral surface of the cylindrical portion contacts the outer peripheral surface of the brake member 71 located radially outward of the planting central shaft 37. The brake housing 72 is preferably formed by providing a flange attached to the planting transmission case 34 on the outer peripheral side of the cylindrical portion. Alternatively, the brake housing 72 may be configured by utilizing a part of the planting transmission case 34.

[0068] The biasing member 74 biases the brake member 71 toward the inner peripheral surface of the cylindrical portion of the brake housing 72, and presses the outer peripheral surface of the brake member 71 against the inner peripheral surface of the cylindrical portion of the brake housing 72. This generates a frictional force between the brake member 71 and the brake housing 72, thereby suppressing the rotation of the brake member 71. This suppresses the rotation of the planting central shaft 37, and provides resistance to the rotational power transmitted from the planting central shaft 37 to the transplanting mechanism 32.

[0069] As described above, according to the second embodiment, in the rice transplanter 1, the power transmission mechanism 20 includes the planting central shaft 37 that rotates in response to the rotational power from the engine 11, which is the power source, to transmit the rotational power to the transplanting mechanism 32, and the transplanting mechanism 32 is supported by the planting central shaft 37. The resistance imparting mechanism 70 includes a brake support member 73 provided around the planting central shaft 37, a brake member 71 that is attached rotatably relative to the brake support member 73 and is located outside the brake support member 73 in the radial direction of the planting central shaft 37, a brake housing 72 that contacts the outer circumferential surface of the brake member 71 located outside the radial direction of the planting central shaft 37, and a biasing member 74 that biases the brake member 71 against the brake housing 72. The resistance imparting mechanism 70 applies resistance to the rotational power transmitted to the transplanting mechanism 32 by the frictional force of the brake member 71 acting on the brake housing 72.

[0070] As a result, compared to the disc brake type resistance applying mechanism 45 of the first embodiment, the drum brake type resistance applying mechanism 70 of the second embodiment can have a larger friction radius, and the spring load of the biasing member 74 for generating a torque equivalent to that of the resistance applying mechanism 45 of the first embodiment against the planting central axis 37 can be reduced.

[0071] Furthermore, compared to the disk brake type resistance imparting mechanism 45 of the first embodiment, the drum brake type resistance imparting mechanism 70 of the second embodiment can increase the spring length (stroke amount) of the biasing member 74. By increasing the contraction amount of the biasing member 74, it is possible to reduce the change in spring load of the biasing member 74 due to wear of the brake member 71, which is a friction material. This makes it possible to stabilize the torque load on the planting central shaft 37, and also improve the durability of the resistance imparting mechanism 70.

[0072] Furthermore, the resistance imparting mechanism 70 can increase the load that the brake member 71 exerts on the brake housing 72 due to its self-servo effect, so that even if the spring load of the biasing member 74 is reduced, it is possible to generate torque equivalent to that of the disc brake type resistance imparting mechanism 45 of the first embodiment.

[0073] In the above embodiment, an example has been described in which the resistance providing mechanism 45 or the resistance providing mechanism 70 is disposed on one side in the left-right direction of the planting central shaft 37, but the present invention is not limited to this example. For example, in another example, the resistance providing mechanism 45 or the resistance providing mechanism 70 may be disposed on both sides in the left-right direction of the planting central shaft 37.

[0074] In the above embodiment, the rice transplanter 1 is described as being provided with the resistance imparting mechanism 45 for imparting resistance to the rotational power to the transplanting mechanism 32 in the planting transmission case 34, but the present invention is not limited to this example. For example, in the third embodiment, the transplanting mechanism 32 may be provided with a resistance imparting mechanism 80 for imparting resistance to the rotational power to the transplanting mechanism 32 (see FIG. 14). In the third embodiment, the transplanting mechanism 32 is provided with a cam member 81 having a function of stabilizing the posture of the planting claw 51 when picking up seedlings and a function of assisting the rotation of the planting rotation shaft 55, instead of the cam member 58 in the above embodiment. The resistance imparting mechanism 80 in the third embodiment is composed of the cam member 81, the restraining arm 59, and the restraining spring 60. In the third embodiment, the description of the same configuration as in the first embodiment is omitted.

[0075] In the third embodiment, the cam member 81 is formed to have a first force accumulation portion 81a in the shape of an arc with a relatively long diameter from the center, and a linear suppression portion 81b that is continuous with the first force accumulation portion 81a and has a gradually shorter diameter from the center. When the abutment of the suppression arm 59 changes from the first force accumulation portion 81a to the suppression portion 81b, the pressure of the suppression arm 59 against the cam member 81 weakens, and the rotation of the cam member 81 accelerates. That is, as shown in FIG. 15, the cam member 81 is arranged so as to accelerate the rotation in the first half 82 of the deceleration section of the transplanting mechanism 32 after the planting claw 51 passes the scraping position in the rotation trajectory of the planting claw 51.

[0076] In addition, the cam member 81 is configured to decelerate the rotation in the latter half 83 of the deceleration section of the transplanting mechanism 32 after the planting claw 51 has passed the scraping position, to accelerate the rotation in the acceleration section 84 of the transplanting mechanism 32 just before the planting claw 51 reaches the planting position, and to decelerate the rotation in the deceleration section 85 of the transplanting mechanism 32 after the planting claw 51 has passed the planting position, in the rotational trajectory of the planting claw 51.

[0077] The cam member 81 is formed to have, for example, in addition to the above-mentioned first force accumulation portion 81a and suppression portion 81b, a second force accumulation portion 81c that is continuous with the suppression portion 81b and has a gradually longer diameter, and an arc-shaped release portion 81d that is continuous from the second force accumulation portion 81c to the first force accumulation portion 81a and has a shorter radius than the arc of the first force accumulation portion 81a. When the abutment of the suppression arm 59 changes from the suppression portion 81b to the second force accumulation portion 81c, the pressing force of the suppression arm 59 against the cam member 81 increases, and the rotation of the cam member 81 decelerates. When the abutment of the suppression arm 59 changes from the second force accumulation portion 81c to the release portion 81d, the pressing force of the suppression arm 59 against the cam member 81 decreases, and the rotation of the cam member 81 accelerates. As the contact of the restraining arm 59 changes from the release portion 81d to the first force accumulation portion 81a, the pressure of the restraining arm 59 against the cam member 81 increases, and the rotation of the cam member 81 decelerates.

[0078] As described above, according to the third embodiment, in the rice transplanter 1, the power transmission mechanism 20 is provided with a planting central shaft 37 that rotates in response to the rotational power from the engine 11 to transmit the rotational power to the transplanting mechanism 32, and the transplanting mechanism 32 is provided with a planting rotation shaft 55 that has an axial direction parallel to the planting central shaft 37 and rotates relative to the rotation of the planting central shaft 37, a planting claw 51 supported by the planting rotation shaft 55, and a cam member 81 circumferentially provided on the planting rotation shaft 55. The transplanting mechanism 32 is configured to rotate so that the planting claw 51 passes through a scraping position where the seedlings are scraped off the seedling mat and a planting position where the seedlings are planted. The power transmission mechanism 20 controls the rotational power so that the transplanting mechanism 32 rotates at an accelerated speed in a section extending before and after the planting claw 51 passes through the scraping position and in a section immediately before the planting claw 51 reaches the planting position. The cam member 81 constitutes a resistance imparting mechanism 45 and is configured to generate a torque that assists in accelerating the rotation of the transplanting mechanism 32 in the section before and after the planting claw 51 passes the scraping position and in the section just before it reaches the planting position, and is configured to generate a torque that assists in decelerating the rotation of the transplanting mechanism 32 when the planting claw 51 moves from the scraping position to the planting position and just after the planting claw 51 passes the planting position.

[0079] As a result, the rice transplanter 1 can cancel the torque generated by the acceleration and deceleration of the transplanting mechanism 32 by giving the cam member 81 an auxiliary function for accelerating and decelerating the transplanting mechanism 32, and reduce the torque fluctuation generated during the rotation of the transplanting mechanism 32. Therefore, when the traveling speed of the traveling body 2 is made high, the vibration of the transplanting mechanism 32 can be suppressed even if the rotation speed of the transplanting mechanism 32 is accelerated or decelerated. In particular, when performing sparse planting work, even if the rotation speed of the transplanting mechanism 32 is accelerated or decelerated by the inter-row transmission 27, rattle and vibration generated in the transplanting mechanism 32 can be suppressed. Thus, according to the present invention, it is possible to provide the rice transplanter 1, which is a seedling transplanter that can perform normal planting work by suppressing the vibration and rattle of the transplanting mechanism 32.

[0080] In the first and second embodiments, the resistance imparting mechanism 45 and the resistance imparting mechanism 70 suppress the rotation of the planting central shaft 37 by using a member provided coaxially with the planting central shaft 37 to impart resistance to the rotational power to the transplanting mechanism 32, but the present invention is not limited to this example. In the resistance imparting mechanism 45 of the first embodiment, the friction plate 41 provided coaxially with the planting central shaft 37 inside the planting transmission case 34 is pressed by the pressing member 42 to suppress the rotation of the planting central shaft 37, and in the resistance imparting mechanism 70 of the second embodiment, the brake member 71 attached coaxially with the planting central shaft 37 is pressed against the brake housing 72 to suppress the rotation of the planting central shaft 37. In contrast, in the fourth embodiment, the resistance imparting mechanism 100 suppresses the rotation of the planting central shaft 37 by acting on the planting central shaft 37 using a connecting member 101 (see Figures 17 and 18) that is not coaxial with the planting central shaft 37. In the fourth embodiment, a description of the configuration similar to that of the first embodiment will be omitted.

[0081] In the fourth embodiment, as shown in Figures 16 and 17, the resistance imparting mechanism 100 is provided at a position different from the position of the planting transmission shaft 36, which is a planting transmission member, and the position of the transplanting mechanism 32, as viewed from the planting central shaft 37. In other words, the resistance imparting mechanism 100 is provided in a direction different from the arrangement direction of the planting transmission member and the transplanting mechanism 32 relative to the planting central shaft 37. While the planting transmission shaft 36 is provided forward of the planting central shaft 37, the resistance imparting mechanism 100 is provided, for example, rearward of the planting central shaft 37. Since the rear end of the rotor case 50 of the transplanting mechanism 32 is located rearward of the rear end of the planting transmission case 34, the resistance imparting mechanism 100 can be provided by utilizing the space behind the planting transmission case 34 to the rear end of the rotor case 50. Alternatively, the resistance imparting mechanism 100 may be provided below or above the planting central shaft 37.

[0082] As shown in Figures 17 and 18, the resistance imparting mechanism 100 includes a connecting member 101 that is not coaxial with the planting central shaft 37, and the connecting member 101 is connected to the planting central shaft 37 to act on the planting central shaft 37. In the fourth embodiment, the planting transmission case 34 has a communication port 34a that opens on a side of the planting central shaft 37 that is different from the side where the planting transmission shaft 36 is arranged, and the resistance imparting mechanism 100 connects the connecting member 101 to the planting central shaft 37 by inserting the connecting member 101 into the planting transmission case 34 through the communication port 34a. The resistance imparting mechanism 100 is attached to the rear of the planting transmission case 34 with the connecting member 101 arranged behind the planting central shaft 37, for example. Incidentally, in the rice transplanter 1, in order to output the power transmitted to the planting transmission case 34 via the planting transmission shaft 36 to an optional device such as a pesticide sprayer, some rice transplanters have an existing opening at the rear of the planting transmission case 34, and this existing opening may be used as the above-mentioned communication port 34a.

[0083] The resistance applying mechanism 100 has a resistance applying case 102 that accommodates the connection member 101. The resistance applying case 102 is formed, for example, in a cylindrical or rectangular tube shape, and has an open output port 102a and an input port 102b. The resistance applying case 102 holds the connection member 101 so that the connection member 101 is exposed to the outside from the output port 102a. The resistance applying case 102 is attached to the planting transmission case 34 with the output port 102a facing the communication port 34a of the planting transmission case 34. As a result, the connection member 101 exposed to the outside of the resistance applying case 102 from the output port 102a enters the inside of the planting transmission case 34 through the communication port 34a and is connected to the planting central shaft 37. For example, the output port 102a is arranged in the front, and the input port 102b is arranged in the rear.

[0084] In the first embodiment described above, inside the planting transmission case 34, the first bevel gear 39 provided on the planting transmission shaft 36 and the second bevel gear 40 provided on the planting central shaft 37 are meshed to transmit the rotational power from the planting transmission shaft 36 to the planting central shaft 37. In addition, by using the first bevel gear 39 and the second bevel gear 40 as non-uniform speed members, the power from the engine 11 can be made into non-uniform speed rotational power and transmitted to the transplanting mechanism 32. In contrast, in the resistance imparting mechanism 100 of the fourth embodiment, the connecting member 101 has a third bevel gear 103 that meshes with the second bevel gear 40 of the planting central shaft 37, and by suppressing the rotation of the third bevel gear 103, the rotation of the second bevel gear 40, i.e., the rotation of the planting central shaft 37 is suppressed.

[0085] The third bevel gear 103 is arranged in a direction different from the arrangement direction of the first bevel gear 39 of the planting transmission shaft 36 relative to the planting central shaft 37, and is arranged, for example, behind the planting central shaft 37 so as to mesh with the second bevel gear 40 of the planting central shaft 37. The planting transmission shaft 36 and the first bevel gear 39 have rotation axes extending radially forward from the planting central shaft 37, while the third bevel gear 103 is arranged with a rotation axis extending radially backward from the planting central shaft 37. The third bevel gear 103 may be configured as a gear that increases the speed of power relative to the second bevel gear 40.

[0086] The connecting member 101 has a shaft 104 that is coaxially connected to the third bevel gear 103, and for example, the third bevel gear 103 is splined to the shaft 104. The shaft 104 is housed inside the resistance applying case 102 and is rotatably supported by a bearing 105 provided inside the resistance applying case 102.

[0087] In addition, the resistance imparting mechanism 100 has a mechanism for suppressing the rotation of the third bevel gear 103 and the shaft 104, which are the connecting member 101, in order to suppress the rotation of the second bevel gear 40 and the planting central shaft 37. As such a mechanism, for example, the resistance imparting mechanism 100 has a friction member 106 that imparts a frictional force to the connecting member 101 and a biasing member 107 that imparts a biasing force to the friction member 106 in order to suppress the rotation of the third bevel gear 103 and the shaft 104. The resistance imparting mechanism 100 imparts the frictional force of the friction member 106 to the connecting member 101 in accordance with the biasing force of the biasing member 107, and by using the frictional force, applies resistance to the rotation of the planting central shaft 37 to which the connecting member 101 is connected, thereby applying resistance to the rotational power transmitted to the transplanting mechanism 32.

[0088] The friction member 106 is provided at the rear end of the shaft 104 in the axial direction, and includes a friction plate 108 that is provided around the outer circumferential surface of the shaft 104 and rotates integrally with the shaft 104, and a pressing member 109 such as a steel plate that is disposed apart from the outer circumferential surface of the shaft 104 and presses the friction plate 108. The friction plate 108 and the pressing member 109 are formed in an annular shape of the same diameter and are housed inside the resistance applying case 102. Note that one or more friction plates 108 (for example, two) are provided, and two or more pressing members 109 (for example, three) are provided so as to sandwich each friction plate 108 from both sides in the axial direction. In FIG. 19, the friction plates 108 and the pressing members 109 are partially omitted.

[0089] The friction plate 108 is splined to the outer circumferential surface of the shaft 104, and has a plurality of internal teeth 108a that fit with a plurality of external teeth 104a provided on the outer circumferential surface of the shaft 104, as shown in Figures 19 and 20. The pressing member 109 has an inner diameter that is approximately the same as the outer diameter of the external teeth 104a of the shaft 104, and is fitted around the external teeth 104a. Note that an oil groove is provided between the outer circumferential surface of the external teeth 104a of the shaft 104 and the bottom of the internal teeth 108a of the friction plate 108 in the radial direction of the shaft 104 and the friction plate 108, and oil can be supplied in the axial direction of the shaft 104 via the oil groove.

[0090] The pressing members 109 are disposed opposite the friction plate 108 on both sides of the friction plate 108 in the axial direction of the shaft 104. The pressing members 109 press the friction plate 108 to generate a friction force between the pressing members 109 and the friction plate 108, thereby suppressing the rotation of the friction plate 108. As a result, the rotation of the shaft 104 and the third bevel gear 103 is suppressed, and the rotation of the second bevel gear 40 meshed with the third bevel gear 103 is suppressed, so that the rotation of the planting central shaft 37 coaxial with the second bevel gear 40 is suppressed, and resistance is applied to the rotational power transmitted from the planting central shaft 37 to the transplanting mechanism 32.

[0091] The biasing member 107 has a coil spring 110 which is an elastic body that biases against the friction member 106, and a holder 111 that holds the coil spring 110. The coil spring 110 is formed to have the same diameter as the friction plate 108 and the pressing member 109 of the friction member 106, and is disposed in contact with the pressing member 109 behind the friction member 106 in the axial direction of the shaft 104, and biases the pressing member 109 from the rear to the front.

[0092] The holder 111 is formed in a cylindrical shape and is attached to the inside of the input port 102b of the resistance applying case 102. For example, a female thread is formed on the inner peripheral surface of the input port 102b, while a male thread is formed on the outer peripheral surface of the holder 111, and the holder 111 is screwed into the input port 102b. The coil spring 110 is accommodated in a space formed by the input port 102b of the resistance applying case 102 and the holder 111. In addition, in the axial direction of the shaft 104, an edge portion 111a extending radially inward is formed at the rear end of the holder 111, and the coil spring 110 is sandwiched between the pressing member 109 of the friction member 106 and the edge portion 111a of the holder 111.

[0093] The coil spring 110 and holder 111 of the biasing member 107 described above function as an adjustment mechanism for adjusting the resistance applied to the rotational power of the transplanting mechanism 32 by the resistance applying mechanism 100. According to this adjustment mechanism, the tensioning position of the holder 111 relative to the resistance applying case 102 is changed to displace the coil spring 110, thereby changing the biasing force applied by the biasing member 107 to the friction member 106, thereby adjusting the frictional force applied by the friction member 106 to the connecting member 101, and adjusting the resistance applied to the planting central shaft 37 and the transplanting mechanism 32.

[0094] For example, in the adjustment mechanism, the more the holder 111 is tightened relative to the resistance applying case 102, the more the holder 111 moves toward the friction member 106, and the stronger the biasing force that the coil spring 110 applies to the friction member 106. This increases the frictional force that the friction member 106 applies to the connection member 101, and the stronger the resistance that the connection member 101 applies to the rotation of the planting central shaft 37. On the other hand, in the adjustment mechanism, the more the holder 111 is loosened relative to the resistance applying case 102, the more the holder 111 moves away from the friction member 106, and the weaker the biasing force that the coil spring 110 applies to the friction member 106. This reduces the frictional force that the friction member 106 applies to the connection member 101, and the weaker the resistance that the connection member 101 applies to the rotation of the planting central shaft 37.

[0095] 20 and 21, a plurality of (e.g., eight) axially extending notches 112 are formed at equal intervals in the circumferential direction on the outer peripheral surface of the holder 111. Also, as shown in Fig. 21, a plurality of (e.g., three) radially penetrating adjustment holes 113 are formed at intervals in the circumferential direction in the resistance applying case 102. Note that the intervals between the notches 112 and the intervals between the adjustment holes 113 are set to different lengths.

[0096] Then, the fastening position of the holder 111 relative to the resistance applying case 102 is adjusted so that any one of the notches 112 aligns with any one of the adjustment holes 113, and a fastening member such as a bolt inserted into the adjustment hole 113 is engaged with the notch 112, thereby fixing the fastening position of the holder 111. There are multiple combinations of the notches 112 and the adjustment holes 113 in one revolution of the holder 111, and there are multiple combinations of the notches 112 and the adjustment holes 113 for each revolution that the holder 111 engages with the resistance applying case 102.

[0097] The holder 111 accepts a tightening operation by manual operation of an operator holding the outer circumferential surface. Alternatively, the holder 111 may have a screw hole on the rear end surface and accept a tightening operation by manual operation of an operator using a tool such as a screwdriver or a hexagonal wrench. Alternatively, the holder 111 may accept a tightening operation by automatic operation by connecting an electric actuator or an electric tool driven by a motor or the like to the rear end surface or the screw hole.

[0098] The resistance applying mechanism 100 also includes a cover 115 that covers the rear part of the resistance applying case 102 and an adjustment mechanism made up of the coil spring 110 and holder 111 of the biasing member 107 in the axial direction of the shaft 104. The cover 115 is fastened to the flange 102c of the resistance applying case 102 by bolts or the like.

[0099] The cover 115 has an oil supply space therein into which oil is supplied, and the oil supply space communicates with the inside of the holder 111 and the inside of the resistance applying case 102 through an opening at the rear end of the holder 111. An oil seal 116 is provided at the front end of the resistance applying case 102, forward of the bearing 105 and around the shaft 104, to prevent oil leakage.

[0100] The cover 115 has an oil inlet 115a on its upper surface that communicates with the oil inlet space for injecting oil, and an oil drain port 115b on its lower surface that communicates with the oil inlet space for draining oil, and the cover 115 also has an oil supply plug 117 for opening and closing the oil inlet 115a, and a drain plug 118 for opening and closing the oil drain port 115b. The oil injected from the oil inlet 115a of the cover 115 is supplied to the inside of the holder 111 and the inside of the resistance applying case 102 through the oil inlet space of the cover 115, and is supplied to the coil spring 110 of the biasing member 107, the friction plate 108 and the pressing member 109 of the friction member 106, and the bearing 105. In addition, since oil inlet 115a is provided on the upper surface of cover 115 and oil drain outlet 115b is provided on the lower surface of cover 115, oil can be added and drained without being obstructed by planting transmission case 34 or transplanting mechanism 32.

[0101] Furthermore, the resistance applying mechanism 100 is configured so that a protective member 120 can be attached to the rear of the resistance applying mechanism 100, for example, to the rear of the cover 115. The protective member 120 may be fastened to the rear end of the cover 115 by a bolt or the like and be detachable from the resistance applying mechanism 100. The resistance applying mechanism 100 is formed so that the length to the rear end of the cover 115 does not reach the rear side of the rotor case 50 of the transplanting mechanism 32 on both sides of the planting transmission case 34, while the protective member 120 is disposed rearward of the rotor case 50.

[0102] The protective member 120 is formed in a size that can at least shield the resistance applying mechanism 100 and the planting transmission case 34 from the rotor cases 50 on both sides when viewed from behind, and functions as a bumper that suppresses collisions behind the resistance applying mechanism 100 and the transplanting mechanism 32. The protective member 120 may be provided for the planting transmission cases 34 at both ends in the left-right direction out of the multiple planting transmission cases 34, or may be provided for each of the multiple planting transmission cases 34.

[0103] As described above, according to the fourth embodiment, in the rice transplanter 1, the power transmission mechanism 20 includes the planting transmission shaft 36, which is a planting transmission member that transmits power in a direction from the engine 11 side, which is the power source, toward the transplanting mechanism 32 side, and the planting central shaft 37 that transmits rotational power to the transplanting mechanism 32 by rotating in response to the power from the planting transmission shaft 36. The transplanting mechanism 32 is supported by the planting central shaft 37 so as to rotate together with the planting central shaft 37. The resistance imparting mechanism 100 is provided in a direction different from the arrangement direction of the planting transmission shaft 36 relative to the planting central shaft 37.

[0104] As a result, in the rice transplanter 1, the resistance imparting mechanism 100 that imparts resistance to the power to the transplanting mechanism 32 can be arranged without interfering with the arrangement of the transplanting mechanism 32 relative to the planting central axis 37. Therefore, the resistance imparting mechanism 100 can be easily operated and maintained without removing the rotor case 50 of the transplanting mechanism 32 and without being hindered by the planting transmission case 34 or the transplanting mechanism 32, and it is possible to adjust the resistance imparted to the power to the transplanting mechanism 32. In addition, since it is not necessary to include the resistance imparting mechanism 100 inside the planting transmission case 34, the planting transmission case 34 does not become large. In addition, by arranging the resistance imparting mechanism 100 using the space to the rear end of the rotor case 50 behind the planting transmission case 34, the resistance imparting mechanism 100 can be provided without increasing the overall length of the rice transplanter 1.

[0105] In addition, in the fourth embodiment, the resistance imparting mechanism 100 has a connecting member 101 connected to the planting central axis 37, a friction member 106 that imparts a frictional force to the connecting member 101, and a biasing member 107 that imparts a biasing force to the friction member 106, and imparts resistance to the rotation of the planting central axis 37 by imparting the frictional force of the friction member 106 to the connecting member 101 in accordance with the biasing force of the biasing member 107, thereby imparting resistance to the rotational power transmitted to the transplanting mechanism 32.

[0106] As a result, the resistance imparting mechanism 100 uses the connecting member 101 to form a path different from the power transmission mechanism 20 that transmits power from the engine 11 side to the transplanting mechanism 32 via the planting transmission shaft 36 and the planting central shaft 37, and this path can impart resistance to the planting central shaft 37 and the transplanting mechanism 32. In addition, in this path, frictional force is imparted to the connecting member 101 by the biasing member 107 and the friction member 106, thereby providing resistance to the rotation of the planting central shaft 37 and suppressing torque fluctuations.

[0107] In addition, the fourth embodiment is provided with an adjustment mechanism for adjusting the resistance applied to the rotational power transmitted to the transplant mechanism 32, and the adjustment mechanism adjusts the frictional force applied by the friction member 106 to the connecting member 101 by displacing the coil spring 110, which is an elastic body constituting the biasing member 107, to change the biasing force applied by the biasing member 107 to the friction member 106.

[0108] As a result, in the resistance applying mechanism 100, frictional force is generated by the elastic coil spring 110 and the friction member 106, and the frictional force applied to the connecting member 101 can be easily adjusted by displacing the elastic body.

[0109] In the fourth embodiment, the resistance applying mechanism 100 includes a cover 115 that covers the adjustment mechanism, and the cover 115 is configured so that oil can be poured into the adjustment mechanism.

[0110] This allows oil to be supplied to the resistance imparting mechanism 100 and its adjustment mechanism, thereby extending the product life of the resistance imparting mechanism 100 and the adjustment mechanism. In addition, the planting transmission case 34 can be configured without being divided into a grease area and an oil bath area, and only the resistance imparting mechanism 100 can be made into an oil bath.

[0111] In the fourth embodiment, the resistance applying mechanism 100 is configured so that a protective member 120 can be attached to the rear thereof.

[0112] This makes it possible to suppress rear impacts on the resistance applying mechanism 100 and the implantation mechanism 32, particularly the rotor case 50, and thus to extend the product life.

[0113] In the fourth embodiment, the connecting member 101, the friction member 106, and the biasing member 107 may be configured with a structure different from that of the above-mentioned examples, so long as they are arranged in a direction different from the arrangement direction of the planting transmission shaft 36, which is the planting transmission member relative to the planting central shaft 37, and the transplanting mechanism 32, for example, rearward.

[0114] In the above embodiment, an example was described in which the planting transmission shaft 36 was used as a planting transmission member that transmits power from the engine 11 to the planting central shaft 37. However, the present invention is not limited to this example, and the planting transmission shaft 36 may be composed of other members such as a belt or chain.

[0115] In the above embodiment, an example was described in which the seedling transplanter of the present invention is configured with a rice transplanter 1, but the present invention is not limited to this example, and the present invention may be configured with other seedling transplanters.

[0116] Furthermore, the present invention can be modified as appropriate within the scope that does not contradict the gist or concept of the invention that can be read from the claims and the entire specification, and seedling transplanters involving such modifications are also included in the technical concept of the present invention.

[0117] [Appendix to the invention] The following will provide an overview of the invention extracted from the above-described embodiment. Note that the configurations and processing functions described in the following supplementary notes can be selected and combined as desired.

[0118] <Appendix 1> A transplanting mechanism that rotates to plant seedlings; A power transmission mechanism that transmits rotational power from a power source to the implantation mechanism; an acceleration / deceleration device that accelerates / decelerates a rotational speed of the rotational power from the power source; A seedling transplanter comprising: a resistance imparting mechanism for imparting a predetermined resistance to the rotational power transmitted to the transplanting mechanism.

[0119] <Appendix 2> The power transmission mechanism includes a planting central shaft that rotates in response to the rotational power from the power source to transmit the rotational power to the transplantation mechanism, The transplantation mechanism is supported by the planting central shaft, The resistance imparting mechanism includes a friction plate provided around the planting central shaft, A pressing member that contacts the friction plate; a biasing member that biases the pressing member against the friction plate, The seedling transplanter according to claim 1, characterized in that the pressing member applies resistance to the rotational power transmitted to the transplanting mechanism by the frictional force acting on the friction plate.

[0120] <Appendix 3> The seedling transplanter according to claim 2, wherein the biasing member is composed of a coil spring.

[0121] <Appendix 4> The seedling transplanter described in Appendix 2 or 3, characterized in that the resistance imparting mechanism is configured to be able to adjust the resistance imparted to the rotational power transmitted to the transplanting mechanism.

[0122] <Appendix 5> the resistance applying mechanism includes an adjustment member disposed on the opposite side to the friction plate and spaced apart from the pressing member, The biasing member is disposed between the pressing member and the adjustment member, The seedling transplanter described in Appendix 4, characterized in that the adjustment member is configured to be able to adjust the distance between the adjustment member and the pressing member.

[0123] <Appendix 6> The power transmission mechanism includes a planting central shaft that rotates in response to the rotational power from the power source to transmit the rotational power to the transplantation mechanism, The transplantation mechanism is supported by the planting central shaft, The resistance applying mechanism includes a brake support member provided around the planting central axis, A brake member rotatably attached to the brake support member on the outer side of the brake support member in the radial direction of the planting central axis; A brake housing that contacts the outer peripheral surface of the brake member located radially outside the planting central axis; a biasing member that biases the brake member against the brake housing, The seedling transplanter according to claim 1, characterized in that the brake member applies resistance to the rotational power transmitted to the transplanting mechanism by a frictional force acting on the brake housing.

[0124] <Appendix 7> The power transmission mechanism includes a planting central shaft that rotates in response to the rotational power from the power source to transmit the rotational power to the transplantation mechanism, The transplanting mechanism has an axial direction parallel to the planting central axis and rotates relatively to the rotation of the planting central axis; A planting claw supported on the planting rotation shaft; A cam member provided around the planting rotation shaft, The transplanting mechanism is configured so that, by rotating, the planting claw passes through a scraping position where the planting claw scrapes the seedlings from the seedling mat and a planting position where the seedlings are planted; The power transmission mechanism controls the rotational power so that the transplanting mechanism rotates at an accelerated rate in a section before and after the planting claw passes through the scraping position and in a section immediately before the planting claw reaches the planting position, The cam member constitutes the resistance imparting mechanism and generates a torque that assists in accelerating the rotation of the transplanting mechanism in the section before and after the planting claw passes the scraping position and in the section just before it reaches the planting position, and generates a torque that assists in decelerating the rotation of the transplanting mechanism when the planting claw moves from the scraping position to the planting position and just after the planting claw passes the planting position.The seedling transplanter described in Appendix 1 is characterized in that

[0125] <Appendix 8> The power transmission mechanism includes a transplantation transmission member that transmits power in a direction from the power source side toward the transplantation mechanism side; A planting central shaft that rotates in response to the power from the planting transmission member to transmit rotational power to the transplanting mechanism, The transplanting mechanism is supported by the planting central shaft so as to rotate together with the planting central shaft, The seedling transplanter described in Appendix 1, characterized in that the resistance imparting mechanism is arranged in a direction different from the arrangement direction of the planting transmission member relative to the planting central axis.

[0126] <Appendix 9> The seedling transplanter described in Appendix 8, characterized in that the resistance providing mechanism has a connecting member connected to the planting central shaft, a friction member that provides a frictional force to the connecting member, and a biasing member that provides a biasing force to the friction member, and provides resistance to the rotation of the planting central shaft by applying the frictional force of the friction member to the connecting member in accordance with the biasing force of the biasing member, thereby providing resistance to the rotational power transmitted to the transplanting mechanism.

[0127] <Appendix 10> an adjustment mechanism for adjusting the resistance applied to the rotational power transmitted to the implantation mechanism; The seedling transplanter described in Appendix 9, characterized in that the adjustment mechanism adjusts the frictional force applied by the friction member to the connecting member by displacing the elastic body constituting the biasing member to change the biasing force applied by the biasing member to the friction member.

[0128] <Appendix 11> The resistance applying mechanism includes a cover that covers the adjustment mechanism. The seedling transplanter described in Appendix 10, characterized in that the cover is configured to allow oil to be poured into the adjustment mechanism.

[0129] <Appendix 12> 12. The seedling transplanter according to claim 8, wherein the resistance applying mechanism is configured so that a protective member can be attached to the rear of the resistance applying mechanism. [Explanation of symbols]

[0130] 1. Rice transplanter (seedling transplanter) 2 Running body 3 Planting machine 11 Engine (power source) 12. Transmission 20 Power transmission mechanism 27 Inter-row speed change device (acceleration / deceleration device) 32 Transplant mechanism 34 Planting transmission case 36 Planting transmission shaft (planting transmission member) 37 Planting center axis 41 Friction plate 42 Pressing member 43 Pressing member 44 biasing support member 45 Resistance Mechanism 50 rotor case 51 Planting Claw 55 Planting Rotation Axis 59 Restraint Arm 60 Restraint spring 70 Resistance Mechanism 71 Brake parts 72 Brake housing 73 Brake support member 74 Pressing member 80 Resistance Mechanism 81 Cam member 100 Resistance mechanism 101 Connection member 102 Resistance Case 103 3rd bevel gear 104 Shaft 106 Friction materials 107 Pressing member 108 Friction plate 109 Pressing member 110 Coil spring (elastic body, adjustment mechanism) 111 Holder (adjustment mechanism) 115 Cover 120 Protective materials

Claims

1. A transplanting mechanism that rotates to plant seedlings; A power transmission mechanism that transmits rotational power from a power source to the implantation mechanism; an acceleration / deceleration device that accelerates / decelerates a rotational speed of the rotational power from the power source; A seedling transplanter comprising: a resistance imparting mechanism for imparting a predetermined resistance to the rotational power transmitted to the transplanting mechanism.

2. The power transmission mechanism includes a planting central shaft that rotates in response to the rotational power from the power source to transmit the rotational power to the transplantation mechanism, The transplantation mechanism is supported by the planting central shaft, The resistance imparting mechanism includes a friction plate provided around the planting central shaft, A pressing member that contacts the friction plate; a biasing member that biases the pressing member against the friction plate, 2. The seedling transplanter according to claim 1, wherein the pressing member applies resistance to the rotational power transmitted to the transplanting mechanism by a frictional force acting on the friction plate.

3. 3. The seedling transplanter according to claim 2, wherein the biasing member is formed of a coil spring.

4. 4. The seedling transplanter according to claim 2, wherein the resistance imparting mechanism is configured to be capable of adjusting the resistance imparted to the rotational power transmitted to the transplanting mechanism.

5. the resistance applying mechanism includes an adjustment member disposed on the opposite side to the friction plate and spaced apart from the pressing member, The biasing member is disposed between the pressing member and the adjustment member, The seedling transplanter according to claim 4, wherein the adjustment member is configured so that a distance between the adjustment member and the pressing member can be adjusted.

6. The power transmission mechanism includes a planting central shaft that rotates in response to the rotational power from the power source to transmit the rotational power to the transplantation mechanism, The transplantation mechanism is supported by the planting central shaft, The resistance applying mechanism includes a brake support member provided around the planting central axis, A brake member rotatably attached to the brake support member on the outer side of the brake support member in the radial direction of the planting central axis; A brake housing that contacts the outer peripheral surface of the brake member located radially outside the planting central axis; a biasing member that biases the brake member against the brake housing, 2. The seedling transplanter according to claim 1, wherein the brake member applies resistance to the rotational power transmitted to the transplanting mechanism by a frictional force acting on the brake housing.

7. The power transmission mechanism includes a planting central shaft that rotates in response to the rotational power from the power source to transmit the rotational power to the transplantation mechanism, The transplanting mechanism has an axial direction parallel to the planting central axis and rotates relatively to the rotation of the planting central axis; A planting claw supported on the planting rotation shaft; A cam member provided around the planting rotation shaft, The transplanting mechanism is configured so that, by rotating, the planting claw passes through a scraping position where the planting claw scrapes the seedlings from the seedling mat and a planting position where the seedlings are planted; The power transmission mechanism controls the rotational power so that the transplanting mechanism rotates at an accelerated rate in a section before and after the planting claw passes through the scraping position and in a section immediately before the planting claw reaches the planting position, The seedling transplanter of claim 1, characterized in that the cam member constitutes the resistance imparting mechanism and generates a torque that assists in accelerating the rotation of the transplanting mechanism in the section before and after the planting claw passes the scraping position and in the section just before it reaches the planting position, and also generates a torque that assists in decelerating the rotation of the transplanting mechanism when the planting claw moves from the scraping position to the planting position and just after the planting claw passes the planting position.

8. The power transmission mechanism includes a transplantation transmission member that transmits power in a direction from the power source side toward the transplantation mechanism side; A planting central shaft that rotates in response to the power from the planting transmission member to transmit rotational power to the transplanting mechanism, The transplanting mechanism is supported by the planting central shaft so as to rotate together with the planting central shaft, The seedling transplanter according to claim 1, wherein the resistance imparting mechanism is provided in a direction different from the arrangement direction of the planting transmission member relative to the planting central shaft.

9. The seedling transplanter described in claim 8, characterized in that the resistance providing mechanism has a connecting member connected to the planting central shaft, a friction member that provides a frictional force to the connecting member, and a biasing member that provides a biasing force to the friction member, and provides resistance to the rotation of the planting central shaft by applying the frictional force of the friction member to the connecting member in accordance with the biasing force of the biasing member, thereby providing resistance to the rotational power transmitted to the transplanting mechanism.

10. an adjustment mechanism for adjusting the resistance applied to the rotational power transmitted to the implantation mechanism; The seedling transplanter according to claim 9, characterized in that the adjustment mechanism adjusts the frictional force applied by the friction member to the connecting member by displacing an elastic body constituting the biasing member to change the biasing force applied by the biasing member to the friction member.

11. The resistance applying mechanism includes a cover that covers the adjustment mechanism. The seedling transplanter according to claim 10, characterized in that the cover is configured so that oil can be poured into the adjustment mechanism.

12. 9. The seedling transplanter according to claim 8, wherein the resistance applying mechanism is configured so that a protective member can be attached to the rear thereof.

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