JP6830338B2 - Rice transplanter - Google Patents

Description

The present invention relates to a rice transplanter provided with a seedling planting device for scraping seedlings from a seedling mat placed on a seedling stand with a planting claw and planting the seedlings in a field.

Conventionally, in a rice transplanter used for planting seedlings in a field, a seedling planting device having a seedling stand and a transplanting mechanism with a planting claw is attached to the rear part of the traveling machine. As a transplanting mechanism of the seedling planting device, a type having two planting claws in one rotary case is common. In this case, when the rotary case makes one rotation, each of the two planting claws makes one rotation in the opposite direction with respect to the rotary case. That is, each planting claw has a structure that rotates while revolving around the center of rotation of the rotary case.

In the seedling planting work, the seedling stand on which the seedling mat is placed is continuously fed laterally at predetermined intervals, and the planting claws facing the seedling stand are revolved around the axis of the rotary case while rotating. The planting claws are reciprocated between the seedling stand and the field scene, and the seedlings are scraped from the seedling mat one by one and planted in the field.

The seedling mat used in the seedling planting work by the rice transplanter has seed paddy on the floor soil spread in a rectangular seedling raising box with an inner diameter of about 580 mm (length) x about 280 mm (width) x about 30 mm (height). It is sown, germinated in a soil-covered state, and raised to form a mat. As for the types of seedling mats, in addition to standard seedling mats in which about 100 g to 130 g of seedlings are sown in one seedling box, the amount of seeds sown in one seedling box is, for example, about 200 g to 300 g. Seedling mats for high-density seedling raising are known (see, for example, Patent Document 1).

Seedling mats for high-density seedlings are grown more densely than standard seedling mats. When using a high-density seedling mat, the planting claws scrape the seedling mat from the seedling mat. In order to make the number of seedlings per plant appropriate, the area where the planting claw scrapes the seedling mat compared to when using the standard seedling mat. The operator sets the seedling planting conditions for the rice transplanter so that As a result, the number of seedling mats required for rice planting work per unit area can be reduced, and economic efficiency is improved.

JP 2015-043731

When the same seedling planting conditions as when using the standard type seedling mat are set when using the high-density seedling mat, the number of seedlings per plant planted in the field will increase, and appropriate seedling planting work will be performed. There was a problem that it could not be done.

The present invention has been made in view of the above situation, and makes it possible to set an appropriate vertical amount of seedlings at the time of planting a seedling mat for high-density seedling raising and at the time of planting a seedling mat for standard type seedling raising. That is a technical issue.

The first aspect of the present invention is a seedling planting device in which seedlings are scraped from a seedling mat placed on a seedling stand and planted in a field with a planting claw, and a seedling take-out plate arranged below the seedling stand. In a rice planting machine in which the vertical amount of seedlings of the planting claws can be adjusted by adjusting the position of the seedling removal plate, the seedlings are taken out according to the displacement of the seedling adjustment member whose position is adjusted by the seedling adjustment actuator mechanism. The position of the board is adjusted, and the seedlings have a lower density than the high-density seedling mat when planting the high-density seedling mat , regardless of the remaining amount of the seedling mat on the seedling stand. The adjustable range of the vertical amount of seedlings is changed by changing the displaceable range of the seedling adjustment member by the seedling adjustment actuator mechanism as compared with the time of planting the seedling mat of the grown standard type seedlings. It is configured to be done.

The second aspect of the present invention is a seedling planting device in which seedlings are scraped from a seedling mat placed on a seedling stand and planted in a field with a planting claw, and a seedling take-out plate arranged below the seedling stand. In a rice planting machine in which the vertical amount of seedlings of the planting claws can be adjusted by adjusting the position of the seedling removal plate, the seedlings are taken out according to the displacement of the seedling adjustment member whose position is adjusted by the seedling adjustment actuator mechanism. The position of the board is adjusted, and the seedlings have a lower density than the high-density seedling mat when planting the high-density seedling mat , regardless of the remaining amount of the seedling mat on the seedling stand. Compared to the time of planting the seedling mat of the grown standard type seedlings, the adjustable range of the seedling vertical amount is on the lower limit side by limiting the displaceable range of the seedling adjustment member by the seedling adjustment actuator mechanism. It is configured to be limited to the predetermined range of.

The rice planting machine according to the present invention includes a seedling planting device that scrapes seedlings from a seedling mat placed on a seedling stand and plants them in a field with a planting claw, and a seedling extraction plate placed below the seedling stand. In a rice planting machine in which the vertical amount of seedlings of the planting claws can be adjusted by adjusting the position of the seedling extraction plate, the adjustable range of the vertical amount of seedlings can be changed. The adjustable range of the seedling vertical amount can be different between the time of planting the seedling mat of the standard type seedling raising and the time of planting the seedling mat of the standard type raising seedling. By changing the adjustable range of the vertical amount of seedlings to be reduced, it is possible to prevent the number of seedlings per plant from becoming extremely large and wasteful consumption of seedlings, and to carry out appropriate rice planting work.

In the rice planting machine of the present invention, the position of the seedling extraction plate is adjusted according to the displacement of the seedling adjustment member whose position is adjusted by the seedling adjustment actuator mechanism, and when the seedling mat for high-density seedling raising is planted. The displaceable range of the seedling adjustment member by the seedling adjustment actuator mechanism is limited as compared with the case of planting a standard type seedling mat in which seedlings are grown at a lower density than the high-density seedling mat. Then, if the adjustable range of the vertical seedling amount is limited to a predetermined range on the lower limit side, the seedling adjustment member can be used without separately providing a member for limiting the adjustable range of the vertical seedling amount. By simply limiting the displaceable range, it is possible to easily change the adjustable range of the seedling vertical amount so that the seedling vertical amount is reduced when planting the seedling mat for high-density seedling raising.

It is a left side view of the passenger-type rice transplanter in the embodiment. It is a top view of a passenger-type rice transplanter. It is a left side view which shows the positional relationship of an engine, a transmission case and a rear axle case. It is a top view which shows the positional relationship of an engine, a transmission case and a rear axle case. It is a top view of the driving operation part which omitted the steering wheel. It is a drive system diagram of a passenger-type rice transplanter. It is a hydraulic circuit diagram of a passenger-type rice transplanter. It is a left side view of a seedling planting apparatus. It is a front view of the seedling planting apparatus. It is a top view of the seedling planting apparatus. It is a top view for demonstrating the planting depth adjustment axis and the periphery of a seedling adjustment axis. It is a left side sectional view for demonstrating the adjustment of the vertical amount of seedlings. It is a front perspective view for demonstrating the actuator mechanism cover. It is a perspective view for demonstrating the planting depth adjustment actuator mechanism. It is a right side view for demonstrating the operation of the planting depth adjustment actuator mechanism. It is a perspective view for demonstrating the seedling adjustment actuator mechanism. It is a left side view for demonstrating the operation of the seedling adjustment actuator mechanism. It is a top view for demonstrating the elevating sensor mechanism and the surface detection sensor mechanism. This is the left side surface for explaining the elevating sensor mechanism and the surface detection sensor mechanism. It is a rear view of the box application agent sprayer. It is a left side view of a box application agent sprayer. It is a side sectional view of a spraying unit. It is a side sectional view around the spray amount adjustment mechanism and the one-way clutch mechanism. It is a top view around the seedling outlet. It is a top view of the transplantation mechanism. It is a left side view of the transplantation mechanism. It is a rear view which shows the planting nail guide structure. It is a separation perspective view of the planting claw guide structure. It is a figure which shows the outlet cover and the planting claw guide, (A) shows the outlet cover for high-density seedling raising, and (B) shows the outlet cover for standard type seedling raising. It is a separation perspective view which shows the attachment / detachment structure of a planting claw and an extruded piece. The front view, the plan view and the left side view of the planting claw, the extruded piece and the push rod, (A) shows for high-density seedling raising, and (B) shows for standard type seedling raising. It is a front view, a plan view, a left side view and a right side view of an extruded piece cover. It is a schematic functional block diagram about the seedling planting control. It is a figure which shows the example of the selection item displayed on the liquid crystal panel. It is a flowchart for demonstrating one Embodiment of the setting of the seedling planting condition and the seedling planting control. It is a flowchart for demonstrating the setting of the seedling planting condition and other embodiment of the seedling planting control. It is a flowchart for demonstrating the setting of the seedling planting condition and the embodiment of the box application agent spraying control. It is a side view which shows the periphery of the seedling taking-out board in a partial cross section for demonstrating another embodiment about the seedling vertical take-out amount. It is an exploded perspective view of a height position adjusting member, a seedling adjusting tool and a guide member. It is a front view for demonstrating another embodiment concerning adjustment of the seedling vertical feed amount. It is a front view which shows the periphery of the height position adjusting member of the same embodiment. It is a schematic functional block diagram concerning the control of the seedling vertical amount and the seedling vertical feed amount of the same embodiment.

Hereinafter, an embodiment embodying the present invention will be described with reference to a drawing when it is applied to an 8-row planting type passenger-type rice transplanter 1 (hereinafter, simply referred to as rice transplanter 1). In the following description, the left side in the traveling direction of the traveling aircraft 2 is simply referred to as the left side, and the right side in the traveling direction is simply referred to as the right side.

First, an outline of the rice transplanter 1 will be described with reference to FIGS. 1 to 5. The rice transplanter 1 of the embodiment includes a traveling machine body 2 supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4 as traveling portions. An engine 5 is mounted on the front portion of the traveling machine body 2. By transmitting the power from the engine 5 to the rear mission case 6 to drive the front wheels 3 and the rear wheels 4, the traveling machine body 2 is configured to travel forward and backward. The front axle case 7 is projected to the left and right sides of the mission case 6, and the front wheels 3 are steerably attached to the front axle 36 extending outward from the front axle case 7 to the left and right. The tubular frame 8 is projected to the rear of the mission case 6, the rear axle case 9 is fixed to the rear end side of the tubular frame 8, and the rear wheels 4 are attached to the rear axle 37 extending outward from the rear axle case 9. ing.

As shown in FIGS. 1 and 2, a work step (body cover) 10 for boarding an operator is provided on the upper surface side of the front portion and the central portion of the traveling machine body 2. A front bonnet 11 is arranged above the front portion of the work step 10, and an engine 5 is installed inside the front bonnet 11. A traveling speed change pedal 12 for stepping operation is arranged on the rear side of the front bonnet 11 on the upper surface of the work step 10. Although details are omitted, the rice transplanter 1 of the embodiment adjusts the shifting power output from the hydraulic continuously variable transmission 40 of the transmission case 6 by driving a shifting electric motor according to the amount of depression of the traveling speed change pedal 12. It is configured to do.

Further, the operation operation unit 13 on the rear upper surface side of the front bonnet 11 is provided with a control handle 14, a traveling main speed change lever 15, and a work lever 16 as an elevating operation tool (see FIG. 5). A control seat 18 is arranged behind the front bonnet 11 on the upper surface of the work step 10 via a seat frame 17. The left and right spare seedling stands 24 are provided on the left and right sides of the front bonnet 11 with the work step 10 interposed therebetween.

A link frame 19 is erected at the rear end of the traveling machine body 2. A seedling planting device 23 for eight-row planting is vertically connected to the link frame 19 via an elevating link mechanism 22 including a lower link 20 and a top link 21. In this case, a hitch bracket 38 is provided on the front surface side of the seedling planting device 23 via a rolling fulcrum shaft (not shown). By connecting the hitch bracket 38 to the rear side of the elevating link mechanism 22, the seedling planting device 23 is arranged so as to be able to move up and down behind the traveling machine body 2. The cylinder base end side of the hydraulic elevating cylinder 39 (hydraulic elevating control mechanism) is supported on the rear portion of the upper surface of the tubular frame 8 so as to be vertically rotatable. The rod tip side of the elevating cylinder 39 is connected to the lower link 20. As a result of rotating the elevating link mechanism 22 up and down by the expansion and contraction of the elevating cylinder 39, the seedling planting device 23 moves up and down. The seedling planting device 23 is configured to be able to rotate around the rolling fulcrum axis to change the tilting posture in the left-right direction.

The operator gets on the work step 10 from the boarding / alighting step 25 on the side of the work step 10, and drives the seedling planting device 23 to plant the seedlings in the field while moving in the field by driving operation. Perform work (rice planting work). During the seedling planting operation, the operator replenishes the seedling planting device 23 with a seedling mat on the spare seedling mounting table 24 at any time.

As shown in FIGS. 1 and 2, the seedling planting device 23 has a planting input case 26 in which power is transmitted from the engine 5 via the mission case 6 and a planting input case 26 connected to the planting input case 26. A set (1 set of 2 rows) of planting transmission cases 27, a seedling planting mechanism 28 provided on the rear end side of each planting transmission case 27, a seedling mounting stand 29 for 8-row planting, and each planting It is provided with a float 32 for leveling the field surface, which is arranged on the lower surface side of the transmission case 27. The seedling planting mechanism 28 is provided with a planting transmission case 27 having two planting claws 30 for one row. Two planting transmission cases 27 are arranged in the planting transmission case 27. By one rotation of the output shaft of the planting transmission case 27, two planting claws 30 cut and grab one seedling each and plant it on the surface of the rice field prepared by the float 32. On the front side of the seedling planting device 23, a ground leveling rotor 85 for leveling (leveling) the field scene is provided so as to be able to move up and down. As shown in FIG. 20, the seedling planting device 23 is provided with a box application agent sprayer (chemical sprayer) 400 for spraying the box application agent on the seedling mat placed on the seedling mounting table 29.

Although the details will be described later, the power from the engine 5 via the mission case 6 is transmitted not only to the front wheels 3 and the rear wheels 4, but also to the planting input case 26 of the seedling planting device 23. In this case, the power from the mission case 6 to the seedling planting device 23 is once transmitted to the inter-stock speed change case 75 provided on the upper right side of the rear axle case 9, and is transmitted from the inter-stock speed change case 75 to the planting input case 26. To. Each seedling planting mechanism 28 and seedling stand 29 are driven by the transmitted power. The inter-strain shifting case 75 includes an inter-strain shifting mechanism 76 that switches between planted seedlings to, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the seedling planting device 23. (See FIG. 6).

Line markers 33 are provided on the left and right outer sides of the seedling planting device 23. The line marker 33 has a marker wheel 34 for drawing muscles and a marker arm 35 that rotatably supports the marker wheel 34. The base end side of each marker arm 35 is pivotally supported on the left and right outside of the seedling planting device 23 so as to be rotatable left and right. The line marker 33 has a working posture in which a locus serving as a reference in the next process is landed on the field surface based on the operation of the work lever 16 in the operation operation unit 13, and the marker wheel body 34 is raised to separate from the field surface. It is configured to be rotatable in a non-working posture.

As shown in FIGS. 3 and 4, the traveling machine body 2 includes a pair of left and right body frames 50 extending in the front-rear direction. Each body frame 50 is divided into a front frame 51 and a rear frame 52. The rear end portion of the front frame 51 and the front end portion of the rear frame 52 are welded and fixed to the horizontally long intermediate connecting frame 53. The front ends of the pair of left and right front frames 51 are welded and fixed to the front frame 54. The rear end side of the pair of left and right rear frames 52 is welded and fixed to the rear frame 55. The front frame 54, the left and right front frames 51, and the intermediate connecting frame 53 are configured in a square frame shape in a plan view. Similarly, the intermediate connecting frame 53, the left and right rear frames 52, and the rear frame 55 are also configured in a square frame shape in a plan view.

As shown in FIG. 4, the front portions of the left and right front frames 51 are connected by two front and rear base frames 56. The intermediate portion of each of the base frames 56 is formed in a U-shaped shape so as to be located lower than the left and right front frames 51. The left and right ends of each base frame 56 are welded and fixed to the corresponding front frame 51. The engine 5 is mounted on both front and rear base frames 56 and supported by vibration isolation via a substantially flat engine base 57 and a plurality of vibration isolation rubbers (not shown). The rear base frame 56 is connected to the front portion of the mission case 6 via the rear relay bracket 60.

As can be seen from FIG. 4, the rear portions of the left and right front frames 51 are connected to the front axle cases 7 protruding from both the left and right sides of the mission case 6. On the center side of the intermediate connecting frame 53, both left and right ends of the U-shaped frame 61 extending diagonally downward and rearward in a side view are welded and fixed. The middle portion of the U-shaped frame 61 is connected to the middle portion of the tubular frame 8 that connects the transmission case 6 and the rear axle case 9 (see FIGS. 3 and 4). The upper ends of the two left and right vertical frames 62 are welded and fixed to the middle portion of the rear frame 55. An intermediate portion of the left and right horizontally long rear axle support frame 63 is welded and fixed to the lower end side of both the left and right vertical frames 62. Both left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. A muffler 65 for reducing the exhaust noise of the engine 5 is arranged below the step support base 64 projecting outward from the front frame 51 on the left side.

As shown in FIGS. 3 and 4, a power steering unit 66 is provided at the front portion of the mission case 6 arranged behind the engine 5. Although details are omitted, the handle shaft is rotatably arranged inside the handle post erected on the upper surface of the power steering unit 66. The steering handle 14 is fixed to the upper end side of the handle shaft. A steering output shaft (not shown) projects downward on the lower surface side of the power steering unit 66. A steering stick 68 (see FIG. 4) for steering the left and right front wheels 3 is connected to the steering output shaft.

The engine 5 of the embodiment is arranged on the intermediate portion of both the front and rear base frames 56 with the output shaft 70 (crankshaft) facing in the left-right direction. The left-right width of the engine 5 and the engine base 57 is smaller than the inner dimension between the left and right front frames 51, and the lower side of the engine 5 and the engine base 57 are arranged on the middle portion of both the front and rear base frames 56. Therefore, it is exposed below both the left and right front frames 51. In this case, the output shaft 70 (axis) of the engine 5 is positioned so as to overlap the left and right front frames 51 in a side view. Exhaust pipes 69 communicating with the exhaust system of the engine 5 are arranged on one left and right side surface (left side surface in the embodiment) of the engine 5. The base end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the tip end side of the exhaust pipe 69 is connected to the exhaust inlet side of the muffler 65.

In the driving operation unit 13 shown in FIG. 5, the traveling main speed change lever 15 is located on one of the left and right sides of the steering handle 14 (located on the left side in the embodiment. Along the guide groove 83 formed in the driving operation unit 13. By operating the traveling main speed change lever 15, the traveling mode of the rice transplanter 1 is configured to be switched to each mode of forward, neutral, reverse, seedling succession and movement. The work lever 16 sandwiches the control handle 14. However, it is located on the other side of the left and right sides (on the right side in the embodiment). The work lever 16 has a plurality of operations such as raising and lowering the seedling planting device 23, connecting and disconnecting the planting clutch 77, and selecting the left and right line markers 33. It is configured to be able to operate in the cross direction.

In this case, when the work lever 16 is tilted forward once, the seedling planting device 23 is lowered, and when the work lever 16 is tilted forward once again, the planting clutch 77 is engaged and operates (power connection state is established). On the contrary, when the work lever 16 is tilted backward once, the planting clutch 77 is disengaged (power is cut off), and when the work lever 16 is tilted backward once more, the seedling planting device 23 is raised. When canceling the ascending / descending operation of the seedling planting device 23, the work lever 16 is tilted in the opposite direction. For example, when the descending movement of the seedling planting device 23 is stopped in the middle, the work lever 16 may be tilted backward. When the work lever 16 is tilted to the left once, the line marker 33 on the left side returns to the working posture, and when the work lever 16 is tilted to the left once again, the line marker 33 on the left side returns to the non-working posture. When the work lever 16 is tilted to the right once, the line marker 33 on the right side returns to the working posture, and when the work lever 16 is tilted to the right once again, the line marker 33 on the right side returns to the non-working posture.

Next, the drive system of the rice transplanter 1 will be described with reference to FIG. The output shaft 70 of the engine 5 projects outward from both the left and right side surfaces of the engine 5. An engine output pulley 72 is provided at a protruding end of the output shaft 70 from the left side surface of the engine 5, a mission input pulley 73 is provided on a mission input shaft 71 protruding to the left outside from the mission case 6, and transmission is performed to both pulleys 72 and 73. I'm wrapping a belt. Power is transmitted from the engine 5 to the transmission case 6 via both pulleys 72 and 73 and a transmission belt.

In the transmission case 6, the shifting power via the continuously variable transmission 40 including the hydraulic pump 40a and the hydraulic motor 40b, the planetary gear device 41, the hydraulic continuously variable transmission 40, and the planetary gear device 41 is changed into a plurality of stages. It is equipped with a gear-type auxiliary transmission mechanism 42, a main clutch 43 that connects and disconnects power transmission from the planetary gear device 41 to the gear-type auxiliary transmission mechanism 42, and a traveling brake 44 that brakes the output from the gear-type auxiliary transmission mechanism 42. ing. The hydraulic pump 40a is driven by the power from the transmission input shaft 71, hydraulic oil is supplied from the hydraulic pump 40a to the hydraulic motor 40b, and the transmission power is output from the hydraulic motor 40b. The transmission power of the hydraulic motor 40b is transmitted to the gear type auxiliary transmission mechanism 42 via the planetary gear device 41 and the main clutch 43. Then, the power is transmitted from the gear type auxiliary transmission mechanism 42 by branching in two directions of the front and rear wheels 3 and 4 and the seedling planting device 23.

A part of the branch power toward the front and rear wheels 3 and 4 is transmitted from the gear type auxiliary transmission mechanism 42 to the front axle 36 of the front axle case 7 via the differential gear mechanism 45 to rotationally drive the left and right front wheels 3. .. The rest of the branching power toward the front and rear wheels 3 and 4 is transmitted from the gear type auxiliary transmission mechanism 42 via the universal joint shaft 46, the rear drive shaft 47 in the rear axle case 9, the pair of left and right friction clutches 48, and the gear type reduction mechanism 49. Then, it is transmitted to the rear axle 37 of the rear axle case 9, and the left and right rear wheels 4 are rotationally driven. When the traveling brake 44 is activated, the output from the gear-type auxiliary transmission mechanism 42 is lost, so that the front and rear wheels 3 and 4 are braked. Further, when the rice transplanter 1 is rotated, the friction clutch 48 on the inside of the rotation in the rear axle case 9 is disengaged and operated to freely rotate the rear wheel 4 on the inside of the rotation, and the rotation of the rear wheel 4 on the outside of the rotation is transmitted. It turns by driving.

Inside the rear axle case 9, a rotor drive unit 86 having a leveling rotor clutch for power connection to the leveling rotor 85 is provided. The power transmitted from the gear type auxiliary transmission mechanism 42 to the universal joint shaft 46 is also branched and transmitted to the rotor drive unit 86, and is transmitted from the rotor drive unit 86 to the ground leveling rotor 85 via the universal joint shaft 87. The field scene is leveled by the rotational drive of the leveling rotor 85.

The branching power toward the seedling planting device 23 is transmitted to the inter-stock speed change case 75 via the PTO transmission shaft mechanism 74 with a universal joint shaft. In the inter-strain shifting case 75, an inter-strain shifting mechanism 76 that switches between planted seedlings to, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the seedling planting device 23 are provided. I have. The power transmitted to the inter-stock speed change case 75 is transmitted to the planting input case 26 via the inter-stock speed change mechanism 76, the planting clutch 77, and the universal joint shaft 78.

In the planting input case 26, a seedling stand horizontal feed mechanism 79 for laterally feeding and moving the seedling loading table 29, a seedling vertical feeding mechanism 80 for vertically feeding and transporting the seedling mat on the seedling loading table 29, and a planting input case. It is provided with a planting output shaft 81 that transmits power from 26 to each planting transmission case 27. The power transmitted to the planting input case 26 drives the seedling stand horizontal feed mechanism 79 and the seedling vertical feed mechanism 80 to continuously move the seedling stand 29 in a reciprocating manner, and the seedling stand 29 reciprocates. When the end (turning point of reciprocating movement) is reached, the seedling mat on the seedling stand 29 is intermittently vertically fed and transported. The power from the planting input case 26 via the planting output shaft 81 is transmitted to each planting transmission case 27, and the planting transmission case 27 and the planting claw 30 of each planting transmission case 27 are rotationally driven. When the fertilizer application device is provided, power is transmitted from the inter-strain speed change case 75 to the fertilizer application device.

Inside the planting input case 26, the left and right longitudinal intermediate shafts 211 and the seedling stand drive shafts 212 are arranged in parallel. The power transmitted to the planting input case 26 is transmitted to the lateral feed mechanism 79 and the seedling vertical feed mechanism 80 via the intermediate shaft 211 and the seedling stand drive shaft 212. A plurality of lateral feed adjusting driven gears 214 are fixed to the seedling stand drive shaft 212, while lateral feed adjusting drive gears 213 corresponding to the lateral feed adjusting driven gears 214 are loosely fitted to the intermediate shaft 211. Only one of the plurality of lateral feed adjustment drive gears 213 is selectively powered from the intermediate shaft 211 by a slide key 215 that can be slid with a slide lever (not shown) provided in the planting input case 26. It is transmitted and rotates the seedling stand drive shaft 212.

Each set of the lateral feed adjusting gears 213 and 214 has a different ratio of the number of teeth, and when the combination of the lateral feed adjusting gears 213 and 214 is changed, the rotation ratio of the seedling stand drive shaft 212 changes. As a result, the lateral feed pitch of the seedling stand 29 changes, and the amount of scraped seedlings on the seedling mat changes. In the embodiment, there are four types of combinations of the lateral feed adjusting gears 213 and 214, and the number of lateral feeds is set to any of 18, 20, 26, and 30 times. Here, the number of times of lateral feeding means the number of times that two planting claws 30 for one row scrape seedlings from the seedling mat while the seedling mounting table 29 is laterally fed to either the left or right moving end. There is. The combination of the lateral feed adjusting gears 213 and 214 corresponding to the lateral feed number of 30 times is applied when the seedling mat for high-density seedling raising is used.

Next, the hydraulic circuit structure of the rice transplanter 1 will be described with reference to FIG. 7. The hydraulic circuit 90 of the rice transplanter 1 includes a hydraulic pump 40a and a hydraulic motor 40b, which are components of the continuously variable transmission 40, and a charge pump 91 and a work pump 92. The hydraulic pump 40a, the charge pump 91 and the work pump 92 are driven by the power of the engine 5. The hydraulic pump 40a and the hydraulic motor 40b are connected to their respective suction side and discharge side via a closed loop oil passage 93. The charge pump 91 is connected to the closed loop oil passage 93. The angle of the swash plate of the hydraulic pump 40a is adjusted by driving the speed change electric motor according to the amount of depression of the traveling speed change pedal 12, and the hydraulic motor 40b is driven in the forward or reverse direction.

The work pump 91 is connected to a power steering unit 66 that assists the operation of the steering handle 14. The power steering unit 66 includes a steering hydraulic switching valve 94 and a steering hydraulic motor 95. By operating the steering handle 14, the steering hydraulic control valve 94 is switched and operated to drive the steering hydraulic motor 95, and the operation of the steering handle 14 is assisted. As a result, the left and right front wheels 3 can be easily steered with a small operating force.

The power steering unit 66 is connected to the flow divider 96. The flow divider 96 branches into a first oil passage 97 and a second oil passage 98. The first oil passage 97 is connected to an elevating switching valve 99 that supplies hydraulic oil to the elevating cylinder 39. The elevating switching valve 99 is a 4-port 2-stage switching type mechanical switching that can be switched between a supply position 99a for supplying hydraulic oil to the elevating cylinder 39 and a discharge position 99b for discharging hydraulic oil from the elevating cylinder 39. It is a valve. By operating the lifting / lowering switching valve 99 by operating the working lever 16 to expand / contract the raising / lowering cylinder 39, the seedling planting device 23 moves up and down via the raising / lowering link mechanism 22. The flow divider 96 and the elevating switching valve 99 are housed in a valve unit 89 provided at the rear of the mission case 6.

An electromagnetic on-off valve 101 is provided in the cylinder oil passage 100 from the elevating switching valve 99 to the elevating cylinder 39. The electromagnetic on-off valve 101 is an electromagnetic control valve that can be switched between an open position 101a for supplying and discharging hydraulic oil to the elevating cylinder 39 and a closed position 101b for stopping the supply and discharge of hydraulic oil to the elevating cylinder 39. is there. Therefore, when the electromagnetic solenoid 102 is excited to set the electromagnetic on-off valve 101 to the open position 101a, the elevating cylinder 39 can be expanded and contracted, and the seedling planting device 23 can be moved up and down. When the electromagnetic solenoid 102 is de-excited and the electromagnetic on-off valve 101 is set to the closed position 101b by the return spring 103, the elevating cylinder 39 is held so as not to expand and contract, and the seedling planting device 23 stops ascending and descending at an arbitrary height position.

An accumulator 105 is connected between the electromagnetic on-off valve 101 and the elevating cylinder 39 in the cylinder oil passage 100 via the accumulator oil passage 104. In the case of a sudden change in the operating oil pressure in the elevating cylinder 39, the accumulator 105 absorbs the fluctuation in the operating pressure, and the combination of the elevating switching valve 99 and the electromagnetic on-off valve 101 smoothly expands and contracts the elevating cylinder 39 to plant seedlings. The device 23 is moved up and down lightly.

The second oil passage 98 of the flow divider 96 is connected to the rolling control unit 106 that controls the left-right tilted posture of the seedling planting device 23. The rolling control unit 106 includes an electromagnetic control valve 107 that supplies hydraulic oil to the rolling cylinder 108. As a result of operating the rolling cylinder 108 integrally provided in the rolling control unit 106 by the switching operation of the electromagnetic control valve 107, the seedling planting device 23 is held in the horizontal posture. The hydraulic circuit 90 of the rice transplanter 1 also includes a relief valve, a flow rate adjusting valve, a check valve, an oil filter, and the like.

Next, the configuration of the seedling planting device 23 will be described with reference to FIGS. 8 to 11. The seedling planting device 23 includes a planting frame 111 that connects the front ends of four sets of planting transmission cases 27 for eight rows. The planting frame 111 extends in the left-right direction. A planting input case 26 is attached to the central portion of the planting frame 111. The planting input case 26 includes a horizontal feed shaft of the seedling stand horizontal feed mechanism 79 that feeds the seedling stand 29 in the left-right direction and a vertical feed mechanism 80 that vertically feeds the seedlings on the seedling stand 29. The feed drive shaft 80a and the planting output shaft 81 of the seedling planting mechanism 28 are rotated.

The planting depth adjusting shaft 121 is rotatably pivotally supported below the front end of the planting transmission case 27. Brackets 113a, 113b arranged on the upper surface of the rear end of the floats 32a, 32b are connected to the planting depth adjusting shaft 121 via the planting depth adjusting links 114a, 114b. Further, the base end portion of the planting depth adjusting member 122 for adjusting the reference planting depth is fixed to the planting depth adjusting shaft 121. The planting depth adjusting member 122 is rotated with the planting depth adjusting shaft 121 as a rotation fulcrum by the planting depth adjusting actuator mechanism described later to adjust the position. By adjusting the position of the planting depth adjusting member 122, the height positions of the brackets 113a and 113b, and thus the floats 32a and 32b (adjusted body) via the planting depth adjusting shaft 121 and the planting depth adjusting links 114a and 114b. ) Is placed at the desired planting depth setting height. A sensing arm of the elevating sensor mechanism 311 is attached to the front end of the center float 32a. The elevating sensor mechanism 311 detects a change in the float inclination angle (planting depth). Above the center float 32a, a surface detection sensor mechanism 331 attached to the front surface of the planting frame 111 is arranged. The surface detection sensor mechanism 331 detects a change in the surface position of the field. A float accommodation mechanism 116 that regulates the vertical movement range of the front end of the side float 32b is attached to the front end of the side float 32b.

Next, the rolling control device 109 will be described. As shown in FIG. 9, the lower end portion of the hitch bracket 38 is rotatably connected to the fulcrum member 141 fixed to the substantially center of the planting frame 111 via the rolling fulcrum shaft 142. The hydraulic rolling cylinder 108 is attached to the attachment seat 143 provided on the upper end side of the hitch bracket 38. The tip of the piston rod 145 of the cylinder 108 is connected to a fixing bracket 147 attached to the rolling arm 146. The cylinder 108 is integrally provided with a rolling control unit 106 that reciprocates the double-acting cylinder 108. Rolling correction spring 149 between the receiving plate 148 fixed to the upper surface of the mounting seat 143 and the pair of spring hooks provided on the upper rail frame 151 on the back side of the seedling stand 29 with the center of the upper rail frame 151 interposed therebetween. Is stretched. When the pendulum type rolling sensor (not shown) detects the inclination of the seedling planting device 23, the piston rod 145 of the cylinder 108 is controlled to move forward and backward to swing the seedling planting device 23 left and right around the rolling fulcrum shaft 142. The seedling planting device 23 is configured to be held horizontally.

Further, the seedling stand horizontal feed mechanism 79 and the seedling vertical feed mechanism 80 are connected to the planting input case 26. The feeder 79a of the seedling stand lateral feed mechanism 79 is connected to the lower side of the back surface of the seedling stand 29, and laterally feeds the seedling stand 29 in the left-right width direction along the upper rail frame 151 and the lower rail frame 152. .. Therefore, the seedling mat on the seedling stand 29 is continuously reciprocated and transported laterally.
On the other hand, a pair of vertical feed drive cams 80b are fixed to the vertical feed drive shaft 80a of the seedling vertical feed mechanism 80. When the seedling stand 29 reaches the reciprocating movement end (reciprocating movement turning point), each vertical feed drive cam 80b rotationally driven by the vertical feed drive shaft 80a abuts on the tip of the driven cam 153 and comes into contact with the tip of the driven cam 153. Is rotated. As a result, the endless band-shaped vertical feed belt 155 is intermittently driven, and the seedling mat on the seedling stand 29 is intermittently vertically fed and conveyed toward the seedling extraction side (the lower end side of the inclination of the seedling stand 29).

The seedling vertical feed belt 155 includes a vertical feed drive roller attached to a left and right horizontally long vertical feed drive roller shaft 154 provided on the lower end side of the seedling stand 29 and a left and right horizontally long vertical feed roller provided in the middle of the seedling stand 29. It is wound around a vertical feed-driven roller attached to a feed-driven roller shaft 157. By placing two rectangular seedling mats in series on the seedling mat mounting surface of the seedling stand 29 and intermittently driving the seedling vertical feed belt 155, the lower end side of the inclination of the seedling mat mounting surface of the seedling mounting table 29 (seedlings). The seedling mat is vertically fed and transported toward the take-out side). The length of the seedling feeding action surface of the seedling feeding belt 155 is longer than the length of one seedling mat. In addition, the seedling interlocking cam 138 fixed to the seedling adjustment shaft 136 and the driven cam 153 attached to the vertical feed drive roller shaft 154 are connected via the interlocking wire 156 to respond to changes in the seedling vertical amount. The amount of vertical feed of seedlings is also changed to perform proper vertical feed of seedlings according to the amount of vertical feed of seedlings.

Further, as shown in FIG. 12, the seedling planting device 23 is provided with a seedling picking adjuster 132 for adjusting the vertical seedling amount by moving the seedling taking-out plate 131 at the lower end of the seedling loading table 29 up and down. .. The seedling adjusting tool 132 is fixed to the upper part of the guide rod 134 which is vertically and vertically supported by the guide member 133 bolted to the planting transmission case 27. The base end portion of the seedling adjustment cam 135 is fixed to the seedling adjustment shaft 136 extending in the left-right direction. The tip of the seedling adjusting cam 135 is inserted into the seedling adjusting tool 132. Further, the base end portion of the seedling adjusting member 137 is fixed to the seedling adjusting shaft 136. By adjusting the position of the seedling adjusting member 137 by the seedling adjusting actuator mechanism 181 described later, the seedling removing plate 131, the seedling adjusting tool 132 and the guide rod 134 are passed through the seedling adjusting shaft 136 and the seedling adjusting cam 135. Is moved up and down to adjust the amount of seedlings for one plant taken out by the planting claw 30. The seedling adjustment shaft 136 is rotatably supported by each bearing plate fixed to the upper part of the planting transmission case 27.

Next, the configuration of the adjustment actuator mechanism group 161 having the planting depth adjustment actuator mechanism 171 and the seedling adjustment actuator mechanism 181 will be described with reference to FIGS. 13 to 17. The adjusting actuator mechanism group 161 includes a planting depth adjusting actuator mechanism 171, a seedling adjusting actuator mechanism 181 and an actuator mechanism cover 162. The adjusting actuator mechanism group 161 is attached to the planting frame 111 at a position on the left side of the rolling fulcrum shaft 142. In the adjusting actuator mechanism group 161, the adjusting actuator mechanisms 171 and 181 are arranged adjacent to each other in the left-right direction. The seedling adjustment actuator mechanism 181 is arranged closer to the center of the traveling machine body 2 than the planting depth adjustment actuator mechanism 171.

The planting depth adjusting actuator mechanism 171 and the seedling adjusting actuator mechanism 181 basically have the same configuration. The adjustment actuator mechanisms 171 and 181 include feed screws 172, 182, slides 173, 183, electric adjustment motors 174, 184, feed screw upper support members 175, 185, and feed screw lower support members 176, 186. It has. As the feed screws 172 and 182 are rotated by the adjustment motors 174 and 184, the slides 173 and 183 are linearly moved on the feed screws 172 and 182. The feed screw upper support members 175 and 185 rotatably support the upper end side (adjustment motor side) of the feed screws 172 and 182. The feed screw lower support members 176 and 186 rotatably support the lower ends of the feed screws 172 and 182. The adjusting actuator mechanisms 171 and 181 may be configured to include a hydraulic motor that rotates the feed screws 172 and 182 instead of the electric adjusting motors 174 and 184.

The actuator mechanism cover 162 is formed with a slipper rotation prevention groove 164d opened along the feed screw 172 and a slider rotation prevention groove 164e opened along the feed screw 182. The rotation prevention protrusions 173a and 183a of the slides 173 and 183 are inserted into the slider rotation prevention grooves 164d and 164e.

The operation of the planting depth adjusting actuator mechanism 171 will be described with reference to FIGS. 14 and 15. The above-mentioned planting depth adjusting member 122 is connected to the sliding element 173 of the planting depth adjusting actuator mechanism 171 via a flexible mechanism. The tip of the planting depth adjusting member 122 whose base end is fixed to the planting depth adjusting shaft 121 is arranged on the upper side of the planting frame 111 near the right side of the planting depth adjusting actuator mechanism 171. A base end portion of a rod-shaped member 123 extending forward and downward is attached to the tip end portion of the planting depth adjusting member 122. A pin member 124 projecting toward the planting depth adjusting actuator mechanism 171 side is attached to the tip of the rod-shaped member 123. On the other hand, the sliding element 173 is attached with an engaging member 173b having a groove in which the tip end portion of the pin member 124 is engaged. In this way, the slide element 173 of the planting depth adjusting actuator mechanism 171 and the planting depth adjusting member 122 are connected.

The planting depth adjusting actuator mechanism 171 is driven by the planting depth adjusting motor 174 according to the set planting depth adjusted by the item selector 291 (see FIG. 5) arranged in the operation unit 13. The slide 173 is moved by rotating the 172. The position of the slide element 173 is detected by, for example, a float position sensor 178 (here, a potentiometer) attached to the left side surface 164b of the feed screw cover member 164. When the engaging member 173b is moved together with the slide element 173, the planting depth adjusting member 122 is rotated around the planting depth adjusting shaft 121 as a rotation fulcrum via the pin member 124 and the rod-shaped member 123 to adjust the position. The rotation of the planting depth adjusting shaft 121 rotates the planting depth adjusting shaft 121 and the above-mentioned planting depth adjusting links 114a and 114b, and the float 32 is arranged in the operation operation unit 13 as an item selector 502 (see FIG. 5). ) Is set at the set planting depth position according to the set planting depth. The item selector 502 will be described later.

The operation of the seedling adjustment actuator mechanism 181 will be described with reference to FIGS. 16 and 17. The above-mentioned seedling adjusting member 137 is connected to the slide 183 of the seedling adjusting actuator mechanism 181 via a flexible mechanism. A base end portion of a connecting member 139 extending forward is attached to the seedling adjusting member 137. The tip of the connecting member 139 is arranged above the planting frame 111 and near the left side of the seedling adjusting actuator mechanism 181. An elongated hole 139a along the longitudinal direction of the connecting member 139 is formed at the tip of the connecting member 139. On the other hand, the slide 183 is provided with an engaging pin member 183b inserted into the elongated hole 139a via the pin support member 183c. By inserting the engaging pin member 183b into the elongated hole 139a of the connecting member 139, the sliding element 183 of the seedling adjusting actuator mechanism 181 and the seedling adjusting member 137 are connected.

The seedling adjustment actuator mechanism 181 moves the slide 183 by rotating the feed screw 182 by driving the seedling adjustment motor 184 according to the set seedling vertical amount adjusted by the item selector 502 (see FIG. 5). Let me. When the engaging pin member 183b is moved together with the slide 183, the seedling adjusting member 137 is rotated around the seedling adjusting shaft 136 as a rotation fulcrum via the connecting member 139 to adjust the position. The seedling adjustment cam 135 is rotated by the rotation of the seedling adjustment member 137 via the seedling adjustment shaft 136, and the seedling extraction plate 131 is set according to the set seedling vertical amount set by the item selector 502. It is placed at the sampling position. As for the position of the slide 183, for example, the position of the tip end portion of the detection rod-shaped member 188 whose base end portion was fixed to the seedling adjustment shaft 136 was attached to the planting frame 111 via the sensor bracket 189. It is detected by the seedling extraction plate sensor 190 (here, a potentiometer).

Next, the elevating sensor mechanism 311 and the surface detection sensor mechanism 331 will be described with reference to FIGS. 18 and 19. The elevating sensor mechanism 311 and the surface detection sensor mechanism 331 are attached adjacent to the central portion of the planting frame 111 above the center float 32a.

In the elevating sensor mechanism 311, the lower end side of the sensing arm 312 is rotatably connected to the front portion of the center float 32a via the bracket 313, and the upper end side of the sensing arm 312 is interlocked and connected to the planting depth link mechanism 314. The planting depth link mechanism 314 is attached to a link bracket 315 fixed to the front surface of the planting frame 111, a link body 317 connected to the link bracket 315 via a rotation support shaft 316, and a front portion of the link body 317. It includes a sensor support member 319 that is connected via a connecting pin 318. The correction arm 321 erected on the planting depth adjusting shaft 121 is connected to the lower part of the link body 317 via a substantially U-shaped correction rod 320. The rear lower end of the sensor support member 319 is connected to the sensor bracket 315 via a substantially U-shaped sensor link rod 322. A swing support shaft 323 arranged in the left-right direction is pivotally supported on the sensor support member 319. Due to the rotation of the planting depth adjusting shaft 121, the correction arm 321 and the correction rod 320 are displaced, the link body 317 rotates with the rotation support shaft 316 as a fulcrum, and the sensor support member 319 swings up and down.

The rear portion of the left swing plate 324 is connected to the left end portion of the swing support shaft 323, and the upper end side of the sensing arm 312 is connected to the front portion of the left swing plate 324. Further, on the left end side of the swing support shaft 323, the base end portion of the regulation plate 330 interlocking with the left swing plate 324 is loosely fitted on the sensor support portion 319 side of the left swing plate 324. An elevating sensor 325 (here, a potentiometer) is provided on the right side surface of the sensor support member 319 via the sensor bracket 326. The rear part of the right swing plate 327 is connected to the right end of the swing support shaft 323, and the detection arm 329 of the elevating sensor 325 is engaged with the long groove of the long groove portion 328 erected on the right side of the right swing plate 327. Let me. The elevating sensor 325 detects the amount of rotational displacement of the swing support shaft 323, and can detect the float angle (tilt angle) indicating the vertical posture of the center float 32a. A coil spring 350 is stretched between the front end of the regulation plate 330 and the front lower part of the sensor support member 319, and a coil spring 351 is stretched between the front end of the right swing plate 327 and the front lower part of the sensor support member 319. Has been done.

The surface detection sensor mechanism 331 is attached to a link bracket 332 fixed to the front surface of the planting frame 111. The rear portion of the link body 334 is connected to the upper portion of the link bracket 332 via the rotary support shaft 333, and the upper portion of the sector gear case 336 is connected to the front portion of the link body 334 via the connecting rod 335. The portion of the sector gear case 336 near the lower part of the right side surface is connected to the lower part of the sensor bracket 332 via a substantially J-shaped sensor link rod 337. The right end of the connecting rod 335 is connected to the front left end of the substantially J-shaped sensor link rod 322 of the elevating sensor mechanism 311 via the connecting plate 338. The sector gear case 336 swings up and down in conjunction with the displacement of the sensor support member 319 of the elevating sensor mechanism 311 that swings up and down with the rotation of the planting depth adjusting shaft 121.

A surface detection swing shaft 339 extending in the left-right direction is rotatably supported on the sector gear case 336. The base end sides of the pair of left and right surface detection arms 340 and 340 are attached to the left and right ends of the surface detection swing shaft 339, and the surface detectors 341 and 341 are attached to the tip ends of the surface detection arms 340 and 340. Inside the sector gear case 336, a sensor shaft 342 that rotates in conjunction with the rotation of the surface detection swing shaft 339 is provided via the sector gear pair 343. A surface detection sensor 344 (here, a potentiometer) is provided on the left side surface of the sector gear case 336, and the detection shaft of the surface detection sensor 344 is connected to the left end portion of the sensor shaft 342. The surface detection sensor 344 detects the amount of rotational displacement of the surface detection swing shaft 339 via the sector gear pair 343 and the sensor shaft 342, and the displacement of the surface detectors 341 and 341 and the seedling planting device 23 from the field surface. It is possible to detect the height up to a predetermined location (for example, the planting depth adjusting shaft 121).

Next, the box application agent sprayer 400 will be described with reference to FIGS. 20 to 23. The box application agent spraying machine 400 includes a support frame 401 connected to the rear upper surface of the planting transmission case 27 of the seedling planting mechanism 28, and four spraying units 402 supported by the support frame 401. The four spraying units 402 are arranged side by side in the left-right direction facing the seedling stand 29 at a position above the lower end portion of the seedling stand 29.

Each spraying unit 402 dispenses a predetermined amount of the box application agent from the hopper 403 accommodating the granular box application agent by driving the feeding mechanism 404, and directs the box application agent from the spray nozzle 405 toward the seedling mat placed on the seedling mounting table 29. Spray the box application. The lower end side of each hopper 403 is bifurcated, the upper end and the lower end are opened, and the upper end opening is closed by a lid member 406 that can be opened and closed. The feeding mechanism 404 is connected to the lower end side of the bifurcated hopper 403. Each spraying unit 402 includes two sets of a feeding mechanism 404 and a spraying nozzle 405, and the feeding mechanism 404 and the spraying nozzle 405 are arranged so as to substantially match the inter-row pitch.

The feeding mechanism 404 feeds the box application agent in the hopper 403 to the spray nozzle 405 at a predetermined supply speed by rotationally driving the feeding roll 408 housed in the feeding case 407. The feeding roll 408 has a substantially disk shape, and a plurality of recesses 408a are formed at equal intervals on the outer peripheral surface thereof. The gap between the feeding roll 408 and the side wall of the hopper 403 is filled with a brush-like member 409 arranged in front of the feeding roll 408 and a sealing member 410 arranged behind the feeding roll 408.

The feeding roll 408 is rotationally driven by a tubular feeding driving shaft 411 extending in the left-right direction. The driving force of the feeding drive shaft 411 is taken out from the planting transmission case 27. In this embodiment, a driving force extraction mechanism 412 connected to the rear portion of one of the four planting transmission cases 27 is attached. The driving force extraction mechanism 412 attaches the rotational motion of the drive extraction shaft 413 to which power is transmitted from the inside of the planting transmission case 27 to the crank plate 414 attached to the rear end of the drive extraction shaft 413 and the lower end side to the tip of the crank plate 414. It is converted into a vertical reciprocating motion by the lower link rod 415. The upper end side of the lower link rod 415 is connected to the manual lever plate 416 rotatably attached to the lever plate support shaft 417 extending in the left-right direction, and the manual lever plate 416 is rotated and reciprocated. The rear end side of the upper link rod 418 arranged in the front-rear direction is connected to the manual lever plate 416, and the upper link rod 418 is reciprocated back and forth to transmit power to the one-way clutch mechanism 420.

The one-way clutch mechanism 420 converts the front-rear reciprocating motion of the upper link rod 418 into a rotary reciprocating motion, and intermittently rotationally drives the transmission drive shaft 421 extended in the left-right direction. In the one-way clutch mechanism 420, the link lever member 422 is rotatably supported on the transmission drive shaft 421, and the front end side of the upper link rod 418 is connected to the upper portion of the link lever member 422. A clutch lever member 423 of a one-way clutch is rotatably supported on the transmission drive shaft 421 on the right side of the link lever member 422. A drive pin 424 protruding to the left side is fixed to the base end side of the clutch lever member 423, and a regulation pin 425 protruding to the right side is fixed to the tip end side of the clutch lever member 423. The torsion coil spring 426 is fitted onto the transmission drive shaft 421, one end side of the torsion coil spring 426 is hooked on the drive pin 424, and the other end side is hooked on the fixing member 427 fixed to the support frame 1. The elasticity of the torsion coil spring 426 urges the drive pin 424 to the lower end of the link lever member 422. The link lever member 422 is reciprocally driven by the reciprocating motion of the upper link rod 418, and the clutch lever member 423 of the one-way clutch is reciprocally driven by the reciprocating motion of the upper link rod 418. Is intermittently driven to rotate in one direction.

The rotatable range of the clutch lever member 423 is limited by the spray amount adjusting mechanism 430. The spray amount adjusting mechanism 430 includes a spray amount adjusting member 433 that linearly moves on the feed screw 432 rotated by the rotation operation of the spray amount adjusting dial 431. The spray amount adjusting member 433 is provided with a stopper member 434 at the lower end. The stopper member 434 is arranged so as to be adjustable in position on the arc locus of the regulation pin 425 of the clutch lever member 423. When the spray amount adjusting member 433 and the stopper member 434 are moved away from the regulation pin 425, the rotatable range of the clutch lever member 423 increases, while the spray amount adjusting member 433 and the stopper member 434 move to the regulation pin 425. When moved in the approaching direction, the rotatable range of the clutch lever member 423 is narrowed. As the rotatable range of the clutch lever member 423 increases, the rotation angle of the transmission drive shaft 421 per reciprocation of the upper link rod 418 increases, so that the rotation speed of the transmission drive shaft 421 increases. On the contrary, the smaller the rotatable range of the latch lever member 423, the smaller the rotation speed of the transmission drive shaft 421.

The rotational driving force of the transmission drive shaft 421 is transmitted to the delivery drive shaft 411 of the spraying unit 402 via the transmission mechanism 435 connected to both ends of the transmission drive shaft 421. Inside the transmission mechanism 435, a pair of gears (not shown) fixed to the delivery drive shaft 411 and the transmission drive shaft 421 are arranged, and the feeding drive shaft 411 is transmitted and driven by the meshing of these gears. It rotates in the direction opposite to the shaft 421. The feeding roll 408 is intermittently rotated by the intermittent rotational driving of the feeding drive shaft 411, and the box application agent in the hopper 403 is sprayed toward the seedling mat through the recess 408a of the feeding roll 408 and the spray nozzle 405. .. Since the box application agent sprayer 400 is fixed to the planting transmission case 27, the seedling mat on the seedling stand 29 is driven by the seedling stand horizontal feed mechanism 79 and the seedling vertical feed mechanism 80 (see FIG. 6) to spray nozzles. It moves relative to 405 in the horizontal and vertical directions. As a result, the box application agent is evenly sprayed on the seedling mat.

In the box application agent sprayer 400, the rotation speed of the transmission drive shaft 421 is adjusted by adjusting the positions of the spray amount adjustment member 433 and the stopper member 434 by the spray amount adjustment mechanism 430, whereby the rotation speed of the feeding drive shaft 411 is adjusted. By extension, the rotation speed of the feeding roll 408 is adjusted so that the amount of the box application agent sprayed from the spray nozzle 405 can be adjusted. The positions of the spray amount adjusting member 433 and the stopper member 434 are adjusted by the spray amount adjusting actuator mechanism 436 which is arranged adjacent to the right side of the spray amount adjusting mechanism 430 and rotates the feed screw 432. The spray amount adjusting actuator mechanism 436 includes a spray amount adjusting motor 437 that rotates the feed screw 432 and a spray amount sensor 438 (here, a potentiometer) that detects the position of the spray amount adjusting member 433. The position of the spray amount adjusting member 433 is adjusted so as to reach the set spray amount based on the box application agent spray amount set by the item setting device 502 (see FIG. 5) described later. It is also possible to manually rotate the spray amount adjusting dial 431 to adjust the spray amount.

Next, the detailed structure of the seedling planting mechanism 28 and its surroundings will be described with reference to FIGS. 24 to 29. Behind the planting input case 26, a seedling take-out plate 131 having a seedling take-out outlet 220 is arranged so as to extend substantially horizontally and horizontally. A lower rail frame 152 extending substantially horizontally and horizontally is fixed to the lower part of the back surface of the seedling stand 29. The lower slide shoe 223 provided on the seedling extraction plate 131 is slidably fitted into the lower rail frame 152 from below.

At each seedling outlet 220 on the seedling extraction plate 131, there is an outlet cover 226 that surrounds the inner peripheral edge of the seedling outlet 220, and a planting claw holding guide 227 that sandwiches the longitudinal half of the planting claw 30 from both the left and right sides. And the planting claw tip guide 228 facing the tip side of the planting claw 30 are detachably attached. In this case, the bolt mounting holes 241 provided at two locations near each seedling outlet 220 on the seedling extraction plate 131, the mounting holes 242 on the upper end side of the planting claw tip guide 228, and the mounting holes for the outlet cover 226. The mounting holes 244 on the upper end side of the 243 and the planting claw holding guide 227 are jointly tightened with bolts 229 in a state of being sequentially overlapped. The presence of the outlet cover 226 improves the strength of each seedling outlet 220 on the seedling extraction plate 131, and contributes to stabilizing the amount of seedlings scraped from the seedling mat by the planting claw 30. The upper end side of the planting claw tip guide 228 and the planting claw holding guide 227 also contributes to improving the strength of each seedling outlet 220 by the co-tightening structure.

In the embodiment, two types of outlet units 230 are prepared by combining the outlet cover 226, the planting claw holding guide 227, and the planting claw tip guide 228. One is for high-density seedling mats, and the other is for standard seedling mats. The outlet unit 230 is configured to be replaced depending on which specification of the seedling mat is used. The groove width dimension ΔW of the opening groove 231 through which the planting claw 30 passes in the outlet cover 226 is widely different between those for high-density seedling raising and those for standard type seedling raising. As shown in FIG. 29, the groove width dimension ΔWa (see (A)) of the outlet cover 226a for high-density seedling raising is based on the groove width dimension ΔWb (see (B)) of the outlet cover 226b for standard seedling raising. Is also set narrow.

In this embodiment, the mounting holes 244 of the planting claw holding guide 227 are formed horizontally horizontally, and the mounting position of the planting claw holding guide 227 on the seedling taking-out plate 131 is set to the seedling taking-out outlet 220 of the taking-out plate 131. And the bolt mounting hole 241 can be adjusted in the width direction of the opening groove 231. Thereby, the planting claw holding guide 227 having the same shape can be adapted to both the groove width dimension ΔWa of the outlet cover 226a for high-density seedling raising and the groove width dimension ΔWb of the outlet cover 226b for standard type seedling raising. Therefore, the outlet unit 230 for the seedling mat for high-density seedling raising and the outlet unit 230 for the seedling mat for standard type seedling raising can share the planting claw pinching guide 227, and the design cost of the planting claw pinching guide 227 can be increased. Manufacturing cost can be reduced.

As shown in FIGS. 25, 26, and 30, a planting claw 30 and a U-shaped extrusion that pushes out the seedlings sandwiched between the planting claws 30 are pushed out on both longitudinal end sides of each rotary case 31 in the seedling planting mechanism 28. It includes a piece 234 and a push rod 235 that slides the extruded piece 234 along the planting claw 30. The planting claws 30 are detachably attached to the planting main body 236 located on both ends of the longitudinal side of the rotary case 31 with threaded rods 237 and nuts 238. The extruded piece 234 is fixed to the tip of the push rod 235.

As shown in FIG. 31, in the embodiment, two types of combinations of the planting claw 30, the extruded piece 234 and the push rod 235 are prepared as the planting claw unit. One is for high-density seedling mats, and the other is for standard seedling mats. The tip side of the planting claw 30a for high-density seedling raising is narrower than the base end side. In this case, the tip side of the planting claw 30b for standard type seedling raising is set to a width of about 14 mm, whereas the tip side of the planting claw 30a for high-density seedling raising is set to a width of about 11 mm. ..

On the other hand, the outside of the bifurcated upper end of the extruded piece 234a for high-density seedling raising is formed in a chamfered shape with the corners cut off so as to incline diagonally downward from the inside to the outside. Then, the bifurcated upper end side of the extruded piece 234a is slidably brought close to the back surface of the narrow tip side of the planting claw 30a for high-density seedling raising. In this way, if the tip side of the planting claw 30a and the bifurcated upper end side of the extruded piece 234a are configured to be narrow, it is easy to scrape one seedling from the seedling mat for high-density seedling raising. However, it is possible to prevent the scraped seedlings from being clogged in the U-shaped extruded piece 234a. On the other hand, the extruded piece 234b for standard seedling raising is formed with a substantially uniform thickness. Then, the bifurcated upper end side of the extruded piece 234b is slidably brought close to the back surface of the tip end side of the planting claw 30b for standard type seedling raising.

Further, as shown in FIG. 32, the extruded piece cover 251 is attached to the tip of the extruded piece 234a and the push rod 235 for high-density seedling raising, and the forked upper end side of the extruded piece 234a and the extruded piece cover 251 is a standard type seedling raising. The planting claw 30b for use may be brought close to the back surface on the tip end side. The extruded piece cover 251 has a substantially U-shape, and is in contact with a cavity portion 252 having an inner wall corresponding to the outer peripheral surface shape of the extruded piece 234a and the push rod 235 and a portion on the tip end side of the inner wall bottom portion of the extruded piece 234a. It includes a front locking protrusion 253 and a pair of rear locking protrusions 254 that come into contact with the lower part of the bifurcated rear side surface (the side surface on the base end side of the push rod 235) of the extruded piece 234a. The extruded piece cover 251 is made of a flexible material metal or resin.

The tip of the extruded piece 234a and the extruded piece cover 251 is directed from the rear locking protrusion 254 side to the front locking protrusion 253 side, and the cavity portion is widened while widening the distance between the rear locking protrusions 254 and 254. Insert into 252. The front locking protrusion 253 abuts on the tip end side of the bottom of the inner wall of the extruded piece 234a, and the rear locking protrusions 254 and 254 abut on the rear side surface of the extruded piece 234a while gripping the push rod 235. , The extruded piece cover 251 is attached to the extruded piece 234a and the tip of the push rod 235. As a result, without replacing the extruded piece 234a and the push rod 235, the extruded piece planting claw 30a for high-density seedling raising is replaced with the standard type seedling raising planting claw 30b, and the extruded piece cover 251 is attached. Therefore, it can be easily used for standard seedling mats. That is, without the complicated replacement work of the push rod 235, both the seedling planting work using the standard type seedling raising seedling mat and the seedling planting work using the high-density seedling raising seedling mat can be performed by one rice transplanter. It can be realized by machine, and the versatility of rice transplanter can be improved.

Next, the control system of the rice transplanter 1 regarding seedling planting will be described. As shown in FIG. 33, the traveling machine body 2 is equipped with a planting work controller 500 (control device) as a control means mainly controlling the control related to the seedling planting device 23. The planting work controller 500 includes a CPU (Central Processing Unit) that executes various arithmetic processes and controls, a ROM (Read Only Memory) that stores control programs and various data, and a RAM that temporarily stores control programs and various data. It has a storage device 501 including (Random Access Memory), an input interface, and the like.

On the input side of the planting work controller 500, an item setting device 502 for selecting and setting various seedling planting conditions, a hydraulic sensitivity setting device 503 for setting a reference float angle, and an elevating sensor 325 for detecting the float angle , Lower link 20 or top link 21 (see FIG. 1), which is composed of sensors such as a potentiometer attached to the rotating part, and detects the position of the seedling planting device 23. Vehicle speed sensor 505 that detects output, float position sensor 178 that detects the position of float 32, seedling extraction board sensor 190 that detects the position of seedling extraction plate 131, surface detection sensor 344 that detects the position of surface detector 341, spraying The spray amount sensor 438 that detects the position of the spray amount adjusting member 433 of the amount adjusting mechanism 430 and the box application agent sprayer mounting sensor 506 that detects the mounting of the box application sprayer 400 on the seedling planting device 23 are electrical. It is connected to the.

On the output side of the planting work controller 500, there are an elevating switching solenoid valve 99 and an electromagnetic on-off valve 101 that control the expansion and contraction of the elevating cylinder 39, and a motor drive circuit unit of the planting depth adjusting motor 174 that adjusts the position of the float 32. 511, the motor drive circuit unit 512 of the seedling adjustment motor 184 that adjusts the position of the seedling extraction plate 131, the motor drive circuit unit 513 of the spray amount adjustment motor 437 that adjusts the amount of the box application agent sprayed, and the operation operation unit 13 A liquid crystal panel 522 (display unit) for displaying various setting items and the like is electrically connected to the display panel 521. Note that FIG. 33 is a schematic functional block diagram, and although not shown, various sensors, drive devices, and the like are electrically connected to the planting work controller 500.

As shown in FIG. 5, in the operation operation unit 13, the hydraulic sensitivity setting device 503 is arranged at the rear right side portion of the operation operation unit 13, and the item setting device 502 is arranged near the left front of the steering wheel shaft of the steering handle 14. Has been done. The hydraulic sensitivity setting device 503 is composed of a switch such as a rotary encoder. The item setter 502 is composed of a switch such as a rotary encoder with a push switch. When the item setter 502 is pinched and rotated in either the left-right direction, various setting items are sequentially displayed on the liquid crystal panel 522 of the display panel 521 each time the item setter 502 is rotated, as shown in FIG. 34. Note that FIG. 34 illustrates only a part of the various setting items of the rice transplanter 1.

When the item setting device 502 is pressed while the target item selection screen 523 is displayed on the liquid crystal panel 522, the screen shifts to the setting screen 524 of the setting item, and the selection item is selected by the knob rotation operation of the item setting device 502. Can be adjusted and changed. When the item setter 502 is pressed while the setting screen 524 is displayed, the conditions for the selected item are determined and the item selection screen 523 is displayed. In this embodiment, the item setting device 502 is used to select the seedling planting mode (seedling mode), adjust the seedling planting depth (planting depth), adjust the seedling vertical amount (seedling amount), and box. The amount of application agent sprayed (box application) is adjusted. Here, the setting item of the box application agent spraying amount (box application) is the box application agent sprayer mounting sensor 506 (FIG. 21) for detecting the mounting of the box application agent sprayer 400 (see FIG. 21) on the seedling planting device 23. 33) may be displayed when detecting the attachment of the box application agent sprayer 400.

The selection and setting of these items are not limited to the configuration performed by the item selector 502. For example, the selection of the dense seedling mode and the standard mode may be switched with a changeover switch, or may be switched each time a push button type switch for mode selection is pressed. Further, the adjustment of the planting depth of the seedlings, the adjustment of the vertical amount of the seedlings, and the adjustment of the amount of the box application agent sprayed may be set by the rotary encoder type setting device.

An embodiment of setting seedling planting conditions and controlling seedling planting will be described with reference to FIG. 35. The rice transplanter 1 can select between a standard mode corresponding to a standard type seedling mat and a dense seedling mode corresponding to a high density seedling mat in which seedlings are grown at a higher density than the standard type seedling mat. It is configured in. The planting work controller 500 stores the control program for the standard mode and the control program for the dense seedling mode in the storage device 501. When using a seedling mat for high-density seedling raising, an outlet cover 226a for high-density seedling raising, a planting claw 30a and an extruded piece 234a are attached, and when using a seedling mat for standard type seedling raising, an outlet cover 226b for standard type seedling raising, planting. The claw 30b and the extruded piece 234b are attached (see FIGS. 30 and 31).

When the dense seedling mode is selected on the item selection screen 523 (see FIG. 34) of the seedling mode by operating the item selector 502 (step S1: Yes), the control program for the dense seedling mode is read (step S2). In the dense seedling mode, the adjustable range of the seedling vertical amount is limited to the predetermined range on the lower limit side on the item selection screen 523 and the setting screen 524 of the seedling amount (vertical seedling amount) (step S3). That is, when planting the seedling mat for high-density seedling raising, the displaceable range of the seedling adjusting member 137 by the seedling adjusting actuator mechanism 181 (see FIG. 17) is electrically operated as compared with the case of planting the seedling mat for standard type raising seedlings. By controllingly limiting, the adjustable range of the vertical amount of seedlings is limited to a predetermined range on the lower limit side. In this embodiment, the adjustable range of the seedling vertical amount is 8 to 17 mm (1 scale is 1 mm and 10 scales) in the standard mode, whereas as shown in FIG. 34, the seedling vertical amount is adjusted in the dense seedling mode. The adjustable range 525 is limited to 8 to 13 mm (6 scales on the lower limit side). If the operator selects the dense seedling mode during rice planting work using a high-density seedling mat, even if the operator forgets to set the seedling vertical amount, the seedling vertical amount can be suppressed to 13 mm or less. It is possible to prevent the number of seedlings per plant from becoming extremely large and wasteful consumption of seedlings, to carry out appropriate rice planting work, and to reduce the burden on the operator regarding the setting of the vertical amount of seedlings.

Further, as described above, the amount of seedling vertical feed by the intermittent drive of the seedling vertical feed belt 155 (see FIGS. 9 and 12) is determined by the seedling interlocking cam 138 (see FIG. 8) and the driven cam 153 via the interlocking wire 156. By connecting the seedlings, the seedling vertical feed amount also changes in response to the change in the seedling vertical feed amount. Therefore, when the seedling mat for high-density seedling raising is used, if the seedling vertical feed amount is set to be smaller than that when the standard type seedling mat is used, the seedling vertical feed amount is also reduced according to the seedling vertical feeding amount. Proper vertical feeding of seedlings is performed. As a result, when using a seedling mat for high-density seedling raising, the consumption speed of the seedling mat can be reduced compared to when using a seedling mat for standard type raising seedlings, and the number of seedling mats required for rice planting work per unit area is reduced. At the same time, the number of times the seedling mat is replenished to the seedling stand 29 can be reduced to reduce the time required for the seedling planting work and the labor of the operator and the work assistant.

Next, control of the planting depth of seedlings during seedling planting work in the dense seedling mode will be described. When the dense seedling mode is selected, the elevation control of the hydraulic cylinder 39 (hydraulic elevation control mechanism) is corrected so that the planting depth of the seedlings is deeper than when the standard mode is selected. When the seedling planting device 23 is lowered by the operation of the work lever 16 and the seedling planting work is started (step S4: Yes), the elevating cylinder 39 is moved to the lowering side by the operation of the elevating switching solenoid valve 99 and the electromagnetic switching valve 101. Driven. The seedling planting device 23 is moved by the elevating cylinder 39 until the elevating sensor value V of the elevating sensor 325 and the target value V1 which is the hydraulic sensitivity (target tilt angle of the center float 32a) match (the tilt angle of the center float 32a is constant). The lowering control is performed, and then the raising and lowering control of the seedling planting device 23 is performed so as to keep the target planting depth constant (V = V1).

During the seedling planting work, the hydraulic sensitivity set value of the hydraulic sensitivity setter 502, the lift sensor value V of the lift sensor 325, and the vehicle speed sensor value of the vehicle speed sensor are read (step S5: Yes), and the hydraulic sensitivity of the hydraulic sensitivity setter 502 is read. The hydraulic sensitivity (sensitivity) of the hydraulic cylinder 39 is corrected to the insensitive side (the side where the front part of the float 32a rises) with respect to the set value (step S6), and based on the elevating sensor value, the corrected sensitivity value, and the vehicle speed sensor value. Then, the target value V1 which is the hydraulic sensitivity is calculated (step S7). Here, as the traveling speed of the traveling machine 2 becomes faster, the float 32 tends to move forward and the amount of sinking of the float 32 increases, while as the traveling speed of the traveling machine 2 becomes slower, the float 32 tends to move forward. Therefore, the amount of sinking of the float 32 decreases, so in step S6, the target value V1 is calculated so that the seedling planting depth becomes constant according to the vehicle speed sensor value.

The seedling planting device 23 is lifted and controlled so that the lift sensor value V and the target value V1 match (step S8). When the elevating sensor value V and the target value V1 match, the elevating and lowering of the seedling planting device 23 is stopped without operating the hydraulic cylinder 39. When the elevating sensor value V is smaller than the target value V1, the electromagnetic on-off valve 101 is connected to the open position 101a, the elevating switching valve 99 is connected to the discharge position 99b, and the elevating cylinder 39 is contracted to cause the elevating sensor value V. The seedling planting device 23 is lowered so that the target value V1 and the target value V1 match. When the elevating sensor value V is larger than the target value V1, the electromagnetic on-off valve 101 is connected to the open position 101a and the elevating switching valve 99 is connected to the supply position 99a so that the elevating sensor value V and the target value V1 match. The seedling planting device 23 is raised.

On the other hand, when the standard mode is selected on the item selection screen 523 (see FIG. 34) of the seedling mode (step S1: No), the control program for the standard mode is read (step S11). In the standard mode, the adjustable range of the seedling vertical amount is not limited by electrical control on the item selection screen 523 and the setting screen 524 of the seedling amount (vertical seedling amount), and is 8 to 17 mm (1 scale 1 mm). It is possible to select in the range of 10 scales).

Subsequently, when the seedling planting work is started in the standard mode and the seedling planting work is in progress (step S12: Yes), the hydraulic sensitivity set value of the hydraulic sensitivity setter 502 and the lift sensor value V of the lift sensor 325 are displayed. The vehicle speed sensor value of the vehicle speed sensor 505 is read (step S13: Yes), and the target value V1 which is the hydraulic sensitivity is calculated (step S14). Here, in the standard mode, the hydraulic sensitivity set value is not corrected as in step S6 in the dense seedling mode. Then, the seedling planting device 23 is controlled so that the elevating sensor value V and the target value V1 match (step S15).

In this embodiment, when the dense seedling mode is selected, the hydraulic sensitivity of the hydraulic cylinder 39 is corrected to the insensitive side with respect to the hydraulic sensitivity set value of the hydraulic sensitivity setter 502 as in step S3 above, as compared with the case of selecting the standard mode. The lifting control of the hydraulic cylinder 39 (hydraulic lifting control mechanism) is corrected so that the planting depth of the seedlings becomes deeper. In the rice planting work using the high-density seedling mat, the area where the planting claw 30 scrapes off the seedling mat is smaller than when the standard type seedling mat is used, so that the seedlings planted in the field are likely to float. Therefore, when the dense seedling mode corresponding to the high-density seedling mat is selected, the hydraulic cylinder 39 is raised and lowered so as to deepen the planting depth of the seedling as compared with the case when the standard mode corresponding to the standard seedling mat is selected. By automatically correcting the control, it is possible to prevent floating seedlings and reduce the burden on the operator regarding setting the planting depth of seedlings.

Further, in steps S7 and S14, the target value V1 of the hydraulic sensitivity is corrected so that the sinking amount of the center float 32a becomes a constant value using the sensor value of the surface detection sensor 334, and the planting depth of the seedling is increased. It may be constant. The amount of subsidence of the center float 32a is calculated from the sensor value of the surface detection sensor 334 that detects the actual height of the field surface, and the target value V1 of the hydraulic sensitivity is set to the insensitive side (front part of the float 32a) so that the amount of subsidence is constant. Is corrected to the rising side) or the sensitive side (the side where the front part of the float 32a is lowered). Here, when the dense seedling mode is selected, the target value V1 of the hydraulic sensitivity is calculated and corrected using the corrected sensitivity value in which the hydraulic sensitivity set value is corrected to the insensitive side in step S6.

With reference to FIG. 36, setting of seedling planting conditions and other embodiments of seedling planting control will be described. In this embodiment, instead of the step S6 (when the dense seedling mode is selected) of the embodiment described with reference to FIG. 35, the position of the float 32 is corrected so that the planting depth of the seedlings becomes deeper. -1 is included. In step S3-1, the planting depth set value is corrected so that the planting depth of the seedlings becomes deeper than the planting depth set value (see FIG. 34) set by the operation of the item selector 502. In this embodiment, the planting depth adjusting motor 174 (see FIG. 15) is driven to rotate the planting depth adjusting member 122 forward by the amount of correction to correct the position of the float 32 toward the planting depth adjusting shaft 121. .. As a result, the amount of nail protrusion of the planting claw 30 (distance between the tip of the planting claw 30 and the bottom surface of the float 32) during the seedling planting operation is increased, and the seedling planting depth is increased. In this way, in the dense seedling mode using the seedling mat for high-density seedling raising, the planting claw 30 scrapes the seedling mat by automatically correcting the position of the float 32 so as to deepen the planting depth of the seedling. Floating seedlings can be prevented even if the area is small, and the burden on the operator regarding setting the planting depth of seedlings can be reduced.

An embodiment of box application agent spraying control will be described with reference to FIG. 37. This embodiment includes step S3-2 for correcting the amount of the box application agent sprayed when the dense seedling mode is selected. The box application amount sprayed by the box application agent sprayer 400 (see FIGS. 20 to 23) is a set value (see FIG. 34) of the box application agent spray amount (box application) set by operating the item selector 502. Alternatively, it is set by rotating the spray amount adjustment dial 431 (see FIG. 23). When the dense seedling mode is selected, the chemical spraying amount set value is corrected so that the chemical spraying amount is larger than the chemical spraying amount set value (step S3-2). In this embodiment, the spray amount adjusting motor 437 (see FIG. 23) is driven to move the spray amount adjusting member 433 away from the regulation pin 425 (backward and diagonally upward) by the amount of correction, and the spraying amount adjusting member. Correct the positions of 433 and stopper member 434.

In the high-density seedling mat, the seedlings are grown densely, so if the amount of the box application agent sprayed is the same as when using the standard seedling mat, it is not possible to sufficiently kill or sterilize the seedlings. Therefore, when using a seedling mat for high-density seedling raising (when the dense seedling mode is selected), by automatically setting a large amount of the box application agent, it is possible to sufficiently kill and sterilize seedlings in the seedling mat for high-density raising seedlings. It is possible to realize healthy growth of seedlings planted in the field and reduce the burden on the operator regarding the setting of the amount of the box application agent to be applied.

As described above, the rice transplanter 1 of the above-described embodiment is a seedling planting device 23 for scraping seedlings from a seedling mat placed on a seedling stand 29 with a planting claw 30 and planting them in a field. In preparation, the standard mode, which has a large amount of scraping corresponding to the standard type seedling mat, and the amount of scraping corresponding to the high density seedling mat, in which the seedlings are grown at a higher density than the standard type seedling mat. Since it is possible to select a dense seedling mode with less seedlings, it is possible to simplify the setting of the rice transplanter when using a seedling mat for high-density seedling raising and reduce the burden on the operator.

Further, the rice planting machine 1 of the above embodiment is a hydraulic cylinder 39 (which controls the raising and lowering of the seedling planting device 23 based on the detection value of the raising and lowering sensor 325 that detects the inclination angle of the float 32a that adjusts the seedling planting depth. Elevation control mechanism) is provided, and when the dense seedling mode is selected, the seedling planting depth is deeper than when the standard mode is selected, so the seedling mat for high-density seedling raising In the rice planting work using, the area where the planting claw 30 scrapes off the seedling mat is small, so the seedlings planted in the field tend to float, but the lifting control of the hydraulic cylinder 39 is automatically corrected so as to deepen the planting depth of the seedlings. By doing so, it is possible to prevent floating seedlings and reduce the burden on the operator regarding setting the planting depth of seedlings.

Further, the rice planting machine 1 of the above embodiment has a configuration in which the vertical amount of seedlings taken from the planting claws 30 can be adjusted by adjusting the position of the seedling taking-out plate 131 arranged below the seedling loading table 29, and is in a dense seedling mode. When selecting, the adjustable range of the vertical seedling amount is limited to the predetermined range on the lower limit side, so if the operator selects the dense seedling mode when planting rice using a high-density seedling mat. Even if you forget to set the vertical seedling amount, you can keep the vertical seedling amount within the specified range on the lower limit side, so you can prevent the number of seedlings per plant from becoming extremely large and wasteful consumption of seedlings. It is possible to carry out appropriate rice planting work and reduce the burden on the operator regarding the setting of the vertical amount of seedlings.

Further, the rice planting machine 1 of the above embodiment has a configuration provided with a box application agent spraying machine 400 (chemical spraying machine) for spraying chemicals on a seedling mat placed on a seedling stand 29, and is in a dense seedling mode. At the time of selection, the amount of chemicals sprayed by the box application agent sprayer 400 is set to be larger than that at the time of selecting the standard mode, so that the operator can densely seed the seedlings when planting rice using a high-density seedling mat. If the mode is selected, the amount of the box application agent sprayed is automatically set to a large amount, so that sufficient seedlings can be killed and sterilized on the seedling mat for high-density seedling raising, and the seedlings planted in the field can grow soundly. At the same time, it is possible to reduce the burden on the operator regarding the setting of the amount of the box application agent sprayed.

Further, the rice planting machine 1 of the above embodiment has a seedling planting device 23 for scraping seedlings from a seedling mat placed on a seedling stand 29 with a planting claw 30 and planting them in a field, and a seedling planting depth. In a rice planting machine equipped with a hydraulic cylinder 39 (elevation control mechanism) that controls the raising and lowering of the seedling planting device 23 based on the detection value of the raising and lowering sensor 325 that detects the inclination angle of the float 32a to be adjusted, the seedling mat for high-density seedling raising At the time of planting, the planting depth of the seedlings is deeper than that at the time of planting the standard type seedling mats in which the seedlings are grown at a lower density than the high-density seedling mats. Floating seedlings can be prevented even when the area where the planting claw 30 scrapes the seedling mat is small in the rice planting operation using the seedling mat for high-density seedling raising.

Further, in the rice planting machine 1 of the above embodiment, when planting the seedling mat for high-density seedling raising, the hydraulic sensitivity (sensitivity) of the hydraulic cylinder 39 (elevation control mechanism) is corrected to the insensitive side, and the seedling planting depth is increased. Since it is configured to be deep, seedlings can be easily planted simply by correcting the hydraulic sensitivity of the hydraulic cylinder 39 when planting the seedling mat for high-density seedling raising without separately providing a member to deepen the planting depth. The depth of attachment can be increased to prevent floating seedlings.

Further, the rice transplanter 1 of the above embodiment has a configuration in which the float 32 is position-adjusted according to the displacement of the planting depth adjusting member 122 whose position is adjusted by the planting depth adjusting actuator mechanism 171 for high-density seedling raising. When planting the seedling mat, the position of the float 32 is corrected to the ascending side so that the planting depth of the seedlings becomes deeper. Therefore, it is not necessary to separately provide a member for deepening the planting depth. By simply correcting the position of the float 32 when planting the seedling mat for dense seedlings, the planting depth of the seedlings can be easily increased to prevent floating seedlings.

Further, the rice planting machine 1 of the above embodiment has a seedling planting device 23 for scraping seedlings from the seedling mat placed on the seedling stand 29 with a planting claw 30 and planting the seedlings in the field, and the seedling mounting stand 29. In a rice planting machine equipped with a box application agent sprayer 400 (drug sprayer) that sprays chemicals on the seedling mat, the seedlings are denser than the seedling mat for high-density seedling raising and when the seedling mat for high-density seedling raising is planted. Since the amount of chemicals sprayed by the box application agent sprayer 400 is changed between when the seedling mat for standard type seedlings grown in Japan is planted, and when the seedling mat for high-density seedlings is planted, it is standard. It is possible to spray the appropriate amount of chemicals on the seedling mats according to the high-density seedling mats and the standard seedling mats by differently spraying the chemicals at the time of planting the seedling mats for type seedlings.

Further, in the rice planting machine 1 of the above embodiment, when planting the seedling mat for high-density seedling raising, the chemical spraying machine 400 (chemical spraying machine) is compared with the case of planting the seedling mat for standard type seedling raising. Since it is configured to increase the amount, it is possible to sufficiently kill and sterilize the seedlings in the high-density seedling mat when planting rice using the high-density seedling mat, and the seedlings planted in the field can be sterilized. A healthy growth can be achieved.

Other embodiments relating to the vertical amount of seedlings will be described with reference to FIGS. 38 and 39. In this embodiment, similarly to the embodiment described with reference to FIGS. 12 and 16, the seedling picking adjuster 132 fixed to the seedling picking plate 131 arranged below the seedling loading table 29 is displaced. The position of the seedling extraction plate 131 is adjusted, and the vertical amount of seedlings taken by the planting claw 30 is adjusted. Further, in this embodiment, a substantially L-shaped height position adjusting member 531 is detachably attached between the seedling taking-out plate 131 and the seedling taking-out adjusting tool 132. Bolt 533 in a state where the mounting groove 531a of the height position adjusting member 531 and the mounting hole 132a of the seedling adjusting tool 132 are overlapped with each other in the bolt mounting hole 532 provided on the lower surface of the seedling taking-out plate 131. Tightened together. The height position adjusting member 531 is attached to each of the seedling picking adjusters 132 provided at four positions of the seedling picking plate 131.

The substantially L-shaped height position adjusting member 531 is provided with a mounting flat portion 531b and a side surface portion 531c, and is used for mounting in a notched groove shape at the tip end side portion (the portion opposite to the side surface portion 531c) of the mounting flat surface portion 531b. A groove 531 is formed. The substantially J-shaped seedling adjusting tool 132 includes a mounting flat portion 132b, a side surface portion 132c, and a rod support portion 132d, and is horizontally long on the tip side portion (the portion opposite to the side surface portion 132c) of the mounting flat portion 132b. A mounting hole 132a is formed. The length of the rod support portion 132d is shorter than the length of the mounting flat portion 132b. The base end portion of the guide rod 132 is fixed to the mounting flat portion 132b, and the side surface of the guide rod 132 near the base end portion is fixed to the recess provided on the tip end surface of the rod support portion 132d to form the base of the guide rod 132. The end side is connected to the seedling adjusting tool 132. The tip end side of the guide rod 132 is formed in the guide holes 133a and 133a formed in the pair of side surface portions 133c and 133c erected at both ends of the mounting flat portion 133b of the substantially U-shaped guide member 133 in the rod longitudinal direction. It is slidably inserted. The guide member 133 is bolted to the side surface of the planting transmission case 27.

The positions of the seedling adjusting member 137 and the seedling adjusting cam 135 are the same in the state where the height position adjusting member 531 is attached and the state where the height position adjusting member 531 is not attached (see FIG. 12). Occasionally, when the height position adjusting member 531 is attached, the seedling taking-out plate 131 is moved to the seedling loading table 29 side by the thickness of the mounting flat portion 531a of the height position adjusting member 531 to move the seedling taking-out plate 131. The height position of is higher. That is, by attaching the height position adjusting member 531 between the seedling taking-out plate 131 and the seedling picking adjuster 132, the adjustable range of the seedling vertical picking amount moves in the direction in which the seedling vertical picking amount decreases. Therefore, when using a seedling mat for high-density seedling raising, the amount of vertical seedlings can be reduced by attaching the height position adjusting member 531 to raise the height position of the seedling extraction plate 131, and the number of seedlings per plant is extremely high. Appropriate rice planting work can be carried out by preventing wasteful seedling consumption due to the large amount of seedlings. Further, if the height position adjusting member 531 is removed, the seedling planting work using the standard type seedling raising seedling mat can be supported.

The attachment / detachment of the height position adjusting member 531 will be described. At the time of mounting the height position adjusting member 531, the bolt 533 is loosened from the state where the seedling picking adjuster 132 is fastened to the seedling picking plate 131 by the bolt 533, and the mounting flat portion 132a of the seedling picking plate 131 and the seedling picking adjuster 132 is loosened. A gap is formed between the two so that the mounting flat portion 531a of the height position adjusting member 531 can be inserted. The notch groove-shaped mounting groove 531a is fitted to the shaft of the bolt 533 so that the inner surface of the side surface 531c of the height position adjusting member 531 and the outer surface of the seedling adjusting tool 132c face each other. The height position adjusting member 531 is inserted between the adjusting tools 132. After that, the bolt 533 is tightened, the height position adjusting member 531 and the seedling adjusting tool 132 are tightened together with the seedling taking out plate 131, and the height position adjusting member 531 of the seedling taking out plate 131 and the seedling adjusting tool 132 is attached. .. When removing the height position adjusting member 531, the bolt 533 is loosened to remove the height position adjusting member 531, and then the bolt 533 is tightened to fasten the seedling adjusting tool 132 to the seedling taking out plate 131. In this way, the height position adjusting member 531 can be easily attached / detached without removing the bolt 533 and the seedling adjusting tool 132 from the seedling taking-out plate 131.

By the way, when the height position adjusting member 531 is attached, the adjustable range of the seedling vertical feed amount moves in the direction in which the seedling vertical feed amount decreases, and it is necessary to adjust the seedling vertical feed amount accordingly. When the height position adjusting member 531 is attached, the seedling adjusting shaft 136 is provided with the seedling vertical feeding amount by the planting claw 30 and the seedling vertical feeding belt 155 (see FIGS. 9 and 12). The effective length of the interlocking wire 156 that connects the fixed seedling picking interlocking cam 138 (see FIG. 9) and the driven cam 153 that rotationally drives the seedling vertical feed belt 155 is shortened. When the effective length of the interlocking wire 156 is shortened, the tip of the driven cam 153 is rotationally displaced upward, and the driven cam 153 rotates due to contact with the vertical feed drive cam 80b (see FIGS. 9 and 12). The angle becomes smaller, and the amount of rotation of the vertical feed drive roller shaft 154 and the seedling vertical feed belt 155 decreases.

Here, it is complicated to adjust the effective length of the interlocking wire 156 each time the height position adjusting member 531 is attached or removed, which increases the burden on the operator. Therefore, when the height position adjusting member 531 is attached, the position of the driven cam 153 may be automatically adjusted.

Other embodiments relating to the adjustment of the vertical feed rate of seedlings will be described with reference to FIGS. 40 to 42. In this embodiment, the position of the driven cam 153 is adjusted to change the amount of vertical feed of seedlings, as in the embodiment described with reference to FIGS. 9 and 12. As shown in FIG. 40, the driven cam 153 is connected to the seedling vertical feed amount adjusting mechanism 541 via the interlocking wire 156. The seedling vertical feed amount adjusting mechanism 541 is attached to a pair of left and right mounting stays 551 and 552 provided on the upper surface of the upper rail frame 151 on the back surface of the seedling stand 29 and an upper mounting stay 553 provided on the upper surface of the back surface of the seedling stand 29. Has been done. The motor support member 543 is bolted to the base bracket 542 which is bolted to the upper part of the mounting stays 551 and 552. The upper part of the motor support member 543 is bolted to the upper mounting stay 553.

A seedling vertical feed amount adjusting motor 544 is attached to the motor support member 543, and the seedling vertical feed amount adjusting gear 545, which is rotated by driving the seedling vertical feed amount adjusting motor 544, can rotate about the rotation shaft 546. It is pivotally supported. The wire connecting member 156a on one end side of the interlocking wire 156 is connected to the interlocking wire connecting pin 547 fixed to one surface of the seedling vertical feed amount adjusting gear 545. The motor support member 543 is connected to a rotation shaft 546 on a surface opposite to the arrangement surface of the seedling vertical feed amount adjusting gear 545 to detect the rotation angle of the seedling vertical feed amount adjusting gear 545. 548 (potentiometer in this case) is arranged. The other end of the interlocking wire 156 is connected to the driven cam 153 via the wire connecting member 156b.

In this embodiment, as shown in FIG. 41, the mounting flat portion 531b of the height position adjusting member 531 that is fastened together with the seedling picking adjuster 132 by the bolt 533 to the back surface of the seedling taking out plate 131 is the seedling picking adjuster 132. It is formed longer than the mounting flat surface portion 132b of. A height position adjusting member mounting sensor 507 (for example, a limit switch or a micro switch) having a detection unit 507a at a position corresponding to the tip of the mounting flat surface portion 531b of the height position adjusting member 531 is arranged inside the seedling extraction plate 131. Has been done. The detection unit 507a protrudes from the back surface of the seedling extraction plate 131 when the height position adjusting member 531 is not mounted, and is pushed by the tip of the mounting flat surface portion 531b when the height position adjusting member 531 is mounted. The height position adjusting member mounting sensor 507 is displaced toward the main body. The height position adjusting member mounting sensor 507 detects whether or not the height position adjusting member 531 is mounted according to the position of the detection unit 507a.

As shown in FIG. 42, the seedling vertical feed amount sensor 548, the height position adjusting member mounting sensor 507, and the seedling take-out plate sensor 190 are connected to the input side of the planting work controller 500. On the output side of the planting work controller 500, the seedling vertical feed amount adjusting motor 544 adjusts the positions of the motor drive circuit unit 512 of the seedling vertical feed amount adjusting motor 184 and the interlocking wire connecting pin 547 of the seedling vertical feed amount adjusting mechanism 541. The motor drive circuit unit 514 of the above is connected. In addition, various sensors, driving devices, and the like, for example, the sensors and devices shown in FIG. 33, are electrically connected to the planting work controller 500.

The planting work controller 500 is a seedling removal adjustment motor 184 and a seedling vertical feed amount adjustment motor 544 based on the output values of the seedling take-out plate sensor 190, the seedling vertical feed amount sensor 438, and the height position adjusting member mounting sensor 507. The drive is controlled to adjust the positions of the seedling extraction plate 131 and the driven cam 153 (see FIGS. 12 and 40) so that the seedling vertical feed amount and the seedling vertical feed amount match. For example, when the range of the seedling vertical amount and the seedling vertical feed amount when the height position adjusting member 531 is not attached is 8 to 17 mm, when the height position adjusting member 531 having a thickness of 3 mm is attached, the seedlings The range of the vertical amount and the vertical feed amount of seedlings moves to 5 to 14 mm. When the mounting of the height position adjusting member 531 (see FIG. 41) is detected by the height position adjusting member mounting sensor 507, the planting work controller 500 vertically feeds the seedlings by the thickness of the height position adjusting member mounting sensor 507. The position of the driven cam 153 is corrected so that the amount is small.

In this embodiment, the planting work controller 500 detects the output value of the seedling extraction plate sensor 190 that detects the position of the seedling extraction plate 131 and the position of the driven cam 153 (the rotation angle of the seedling vertical feed amount adjusting gear 545). Based on the output value of the seedling vertical feed amount sensor 438 and the output value of the height position adjusting member mounting sensor 507, the drive of the seedling vertical feed amount adjusting motor 544 is controlled to adjust the position of the driven cam 153. Change the amount of vertical feed of seedlings. Therefore, the driven cam 153 can be displaced to an appropriate position so that the seedling vertical feed amount and the seedling vertical feed amount match without adjusting the effective length of the interlocking wire 156 (see FIG. 40). The configuration of the actuator mechanism for adjusting the position of the driven cam 153 via the interlocking wire 156 is not limited to the configuration of the seedling vertical feed amount adjusting mechanism 541. The actuator mechanism may have any configuration as long as the position of the driven cam 153 can be adjusted by driving the actuator.

Further, when the height position adjusting member mounting sensor 507 detects the mounting of the height position adjusting member 531, the planting work controller 500 automatically selects the dense seedling mode and the dense seedling mode control program (FIG. FIG. The seedling planting operation may be carried out according to (35 to 37). In this case, the adjustable range of the vertical amount of seedlings is limited to a predetermined range on the lower limit side. For example, when the adjustable range of the vertical seedling amount when the height position adjusting member 531 having a thickness of 3 mm is attached is 5 to 14 mm, the adjustable range of the vertical seedling amount is 5 in the automatically selected dense seedling mode. It is limited to ~ 11 mm (predetermined range on the lower limit side). As a result, as in the above embodiment, it is possible to prevent the number of seedlings per plant from becoming extremely large and wasteful seedling consumption, and to perform appropriate rice planting work, and the operator regarding the setting of the vertical amount of seedlings. The burden can be reduced.

The operator may manually select the dense seedling mode or the standard mode when the height position adjusting member 531 is attached. In this case, the rice transplanter 1 has a configuration suitable for planting a seedling mat for high-density seedling raising, but can also be applied to planting a seedling mat for standard seedling raising by selecting the standard mode, and is a general-purpose rice transplanter 1. Improves sex. In addition, the rice transplanter 1 can appropriately plant seedlings scraped from a seedling mat for high-density seedling raising in a field by appropriately setting various conditions in a standard mode.

As described above, the rice planting machine 1 of the above embodiment is a seedling planting device 23 that scrapes seedlings from the seedling mat placed on the seedling stand 29 with the planting claws 30 and plants them in the field. The seedling vertical amount can be adjusted in a rice planting machine provided with a seedling extraction plate 131 arranged below the seedling loading table 29 and capable of adjusting the seedling vertical amount of the planting claw 30 by adjusting the position of the seedling extraction plate 131. Since the range can be changed, the adjustable range of the vertical seedling amount can be different between when planting the seedling mat for high-density seedling raising and when planting the seedling mat for standard type seedling raising. The adjustable range of the vertical seedling amount is changed so that the vertical amount of seedlings is reduced when planting the seedling mat for dense seedlings, and the number of seedlings per plant becomes extremely large, resulting in wasteful consumption of seedlings. Can be prevented and proper rice planting work can be performed.

Further, the rice planting machine 1 of the above embodiment has a configuration in which the seedling removal plate 131 is position-adjusted according to the displacement of the seedling adjustment member 137 whose position is adjusted by the seedling adjustment actuator mechanism 181. When planting the seedling mat, the displacement of the seedling adjustment member 137 by the seedling adjustment actuator mechanism 181 is compared with the case of planting the standard type seedling mat in which the seedlings are grown at a lower density than the seedling mat for high-density raising. Since the adjustable range of the vertical seedling amount is limited to the predetermined range on the lower limit side by limiting the possible range, the seedling adjustment member without separately providing a member that limits the adjustable range of the vertical seedling amount. By simply limiting the displaceable range of 137, the adjustable range of the seedling vertical amount can be easily changed so that the seedling vertical amount is reduced when planting the seedling mat for high-density seedling raising.

Further, in the rice planting machine 1 of the above embodiment, the seedling removal plate 131 is moved with the displacement of the seedling adjustment member 137 connected to the seedling removal plate 131 via the seedling removal adjustment tool 131 fixed to the seedling removal plate 131. The position is adjusted, and the height position adjusting member 531 is detachably attached between the seedling taking-out plate 131 and the seedling picking adjuster 137, and the seedling vertical picking amount can be adjusted within the adjustable range of the seedling vertical picking amount. Since it is moved in the direction of decreasing the number of seedlings, the amount of vertical seedlings can be reduced by attaching the height position adjusting member 531 to raise the height position of the seedling extraction plate 131 when using a seedling mat for high-density seedling raising. It is possible to prevent unnecessary seedling consumption due to an extremely large number of seedlings and to carry out appropriate rice planting work. Further, if the height position adjusting member 531 is removed, the seedling planting work using the standard type seedling raising seedling mat can be supported. That is, both the seedling planting work using the standard type seedling mat and the seedling planting work using the high-density seedling mat can be realized by one rice transplanter 1, and the general purpose of the rice transplanter 1. You can improve your sex. Moreover, if there is one rice transplanter 1 of this type, it is not necessary to use or purchase a rice transplanter 1 dedicated to a seedling mat for high-density seedling raising, which is very economical for the user.

Further, in the rice planting machine 1 of the above embodiment, seedlings are planted in a field by scraping seedlings from a seedling mat placed on a seedling mounting table 29 having a seedling vertical feed belt 155 for transporting seedling mats with a planting claw 30. In a rice planting machine equipped with the attachment device 23, when planting a seedling mat for high-density seedlings, compared to when planting a seedling mat for standard-type seedlings in which seedlings are grown at a lower density than the seedling mat for high-density seedlings. Since the seedling vertical feed belt is configured to reduce the seedling vertical feed amount, the seedling vertical feed amount by the planting claw 30 is reduced when the seedling mat for high-density raising seedlings is planted. The amount of vertical feed of seedling mats can be reduced, excessive vertical feed of seedling mats can be prevented when planting seedling mats for high-density raising seedlings, and the seedling mats can be prevented from collapsing. One seedling can be appropriately scraped from the mat.

Further, in the rice planting machine 1 of the above embodiment, the seedling taking-out plate 131 arranged below the seedling loading table 29 is adjusted in position according to the displacement of the seedling picking adjusting member 137, so that the seedling vertical picking of the planting claw 30 is performed. The amount can be adjusted, and the amount of vertical feed of seedlings is changed according to the change in the amount of vertical seedlings. When planting a seedling mat for high-density seedlings, a seedling mat for standard type seedlings is planted. Compared to the occasion, the adjustable range of the vertical seedling amount is limited to the predetermined range on the lower limit side, and the variable range of the vertical feed amount of the seedlings is limited to the predetermined range on the lower limit side. In addition, while changing the amount of vertical feed of seedlings to realize appropriate vertical feed of seedlings, the number of seedlings per plant becomes extremely large when planting a seedling mat for high-density raising seedlings, resulting in wasteful consumption of seedlings. Can be prevented and appropriate rice planting work can be performed.

Further, in the rice planting machine 1 of the above embodiment, the seedling taking-out plate 131 is moved with the displacement of the seedling taking-out adjusting member 132 connected to the seedling taking-out plate 131 via the seedling taking-out adjusting tool 137 fixed to the seedling taking-out plate 131. The position is adjusted and the amount of vertical feed of seedlings is changed according to the change of the amount of vertical seedlings, and the height position adjustment member 531 can be attached and detached between the seedling extraction plate 131 and the seedling adjustment tool 132. The adjustable range of the vertical feed rate of seedlings is moved in the direction of decreasing the vertical feed rate of seedlings, and the variable range of the vertical feed rate of seedlings is moved in the direction of decreasing. At the time of use, the amount of vertical seedlings can be reduced by attaching the height position adjusting member 531 to raise the height position of the seedling extraction plate 131, and the amount of vertical seedling feed can be changed according to the change in the amount of vertical seedlings. While realizing appropriate vertical feeding of seedlings, it is possible to prevent unnecessary seedling consumption due to an extremely large number of seedlings per plant and to carry out appropriate rice planting work. Further, if the height position adjusting member 531 is removed, the seedling planting work using the standard type seedling raising seedling mat can be supported.

The present invention is not limited to the above-described embodiment, and can be embodied in various aspects. The configuration of each part is not limited to the illustrated embodiment, and various changes can be made without departing from the spirit of the present invention.

1 Rice transplanter 23 Seedling planting device 29 Seedling stand 30 Planting claw 131 Seedling take-out plate 132 Seedling adjustment tool 137 Seedling adjustment member 181 Seedling adjustment actuator mechanism 531 Height position adjustment member

Claims (2)

It is equipped with a seedling planting device that scrapes seedlings from a seedling mat placed on a seedling stand and plants them in a field with a planting claw, and a seedling extraction board placed below the seedling stand. In a rice transplanter whose vertical amount of seedlings for planting claws can be adjusted by adjusting the position
The seedling take-out plate is adjusted in position according to the displacement of the seedling adjustment member whose position is adjusted by the seedling adjustment actuator mechanism.
Regardless of the remaining amount of the seedling mat on the seedling stand, when planting the seedling mat for high-density raising, the seedling mat for standard-type raising seedlings in which the seedlings are grown at a lower density than the seedling mat for high-density raising is planted. By making the displaceable range of the seedling adjusting member by the seedling adjusting actuator mechanism different from that at the time of attachment, the adjustable range of the seedling vertical amount is changed.
Rice transplanter. It is equipped with a seedling planting device that scrapes seedlings from a seedling mat placed on a seedling stand and plants them in a field with a planting claw, and a seedling extraction board placed below the seedling stand. In a rice transplanter whose vertical amount of seedlings for planting claws can be adjusted by adjusting the position
The seedling take-out plate is adjusted in position according to the displacement of the seedling adjustment member whose position is adjusted by the seedling adjustment actuator mechanism.
Regardless of the remaining amount of the seedling mat on the seedling stand, when planting the seedling mat for high-density raising, the seedling mat for standard-type raising seedlings in which the seedlings are grown at a lower density than the seedling mat for high-density raising is planted. Compared to the time of attachment, the displaceable range of the seedling adjustment member by the seedling adjustment actuator mechanism is limited, and the adjustable range of the vertical amount of seedlings is limited to a predetermined range on the lower limit side. ing,
Rice transplanter.

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