JP2017112903A - Transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transplanter in which a control lever can be shifted from a raised to a fixed position when the machine body is raised to a predetermined position.SOLUTION: The transplanter comprises: a machine body; a raising and lowering cylinder for raising and lowering the machine body; a movable member which moves with the motion of the raising and lowering cylinder; a raising and lowering valve for controlling the raising and lowering cylinder; a control lever for operating the raising and lowering valve, the control lever being placeable between a raised position for raising the machine body and a fixed position for stopping the raising or lowering of the machine body and retainable in the raised position or fixed position; and a return mechanism which engages the movable member to shift the control lever to the fixed position when the machine body is raised to a predetermined position with the control lever placed in the raised position.SELECTED DRAWING: Figure 29

Description

  The present invention relates to a transplanter for planting seedlings in a field.

Conventionally, a technique disclosed in Patent Document 1 is known as a transplanter.
The transplanter disclosed in Patent Document 1 includes a machine body, a lift cylinder that lifts and lowers the machine body, a lift valve that controls the lift cylinder, and an operation lever that operates the lift valve. The operation lever can be operated to a raised position for raising the aircraft and a fixed position for stopping raising and lowering the aircraft.

JP 2007-195466 A

  In the walking type transplanter, when the transplanter is turned on the headland in the field, the aircraft is first raised to the highest position. Next, by pushing down the steering handle at the rear of the aircraft, the front of the aircraft is raised to lift the front wheels. And it is made to turn in this state. In addition, there is a transplanter that can hold an operation lever for operating the lift valve in the raised position. For transplanters that can hold the operating lever in the raised position, if the machine body is raised to the highest position and you forget to return the operating lever to the fixed position, the relief valve for the hydraulic circuit that controls the lifting cylinder Will remain open. If this relief valve is left open, there arises a problem that, for example, the oil temperature of the hydraulic oil rises.

  An object of the present invention is to provide a transplanter that can automatically change the position of an operation lever from a raised position to a fixed position when the machine body is raised to the highest position.

The technical means taken by the present invention to solve the technical problems are characterized by the following points.
The transplanter of the present invention includes an airframe, an elevating cylinder for elevating and lowering the airframe, a movable member that moves as the elevating cylinder expands and contracts, an elevating valve that controls the elevating cylinder, and an operation for operating the elevating valve. A lever that can be operated at a raised position for raising the airframe and a fixed position for stopping raising and lowering of the airframe, and that can be held at the raised position and the fixed position; and the operation lever at the raised position. A return mechanism that engages with the movable member and changes the position of the operation lever to a fixed position when the machine body is raised to a predetermined position.

Further, the return mechanism includes an operating member that the movable member presses when the airframe is located at the predetermined position, and the operation lever that is fixed from the raised position when the movable member presses the operating member. A return wire that interlocks the operating lever and the actuating member to change the position to a position;
The actuating member can be repositioned between a standby position, which is a position before the movable member is pressed, and an operating position, which is a position pressed by the movable member, and the return mechanism includes the actuating member. A return spring for urging the actuating member to return the actuator to the standby position.

  The transplanter is an elevating wire that transmits the operating force of the operating lever to the elevating valve, and includes a lifting wire on which an urging force acts, and a link mechanism provided between the operating lever and the elevating wire. The operation lever is held at the fixed position by the urging force when the operation lever is located at the fixed position, and the operation lever is moved to the raised position by the urging force when the operation lever is located at the raised position. A link mechanism for switching the urging force so as to be held.

According to the present invention, when the airframe is raised to a predetermined position when the operation lever is in the raised position, the operation lever is moved to the fixed position by engaging with the movable member that moves as the lifting cylinder extends and contracts. A return mechanism for changing the position is provided. Thereby, when the machine body is raised to a predetermined position, the operation lever can be automatically changed from the raised position to the fixed position.
The return mechanism includes an operating member that the movable member presses when the airframe is positioned at a predetermined position, and an operating lever that moves the operating lever from the raised position to the fixed position when the movable member presses the operating member. A return wire interlocking with the actuating member. As a result, the return mechanism can be realized with a simple structure.

Further, by providing a return spring that returns the operating member to the standby position, it is possible to save the trouble of returning the operating member to the standby position.
The link mechanism is provided between the operating lever and the lifting wire that transmits the operating force of the operating lever to the lifting valve, and is operated by a biasing force that acts on the lifting wire when the operating lever is located at a fixed position. A return mechanism is provided in the transplanter having a link mechanism for switching the urging force so that the lever is held in the raised position by the urging force when the lever is held in the fixed position and the operation lever is located in the raised position. . Thereby, the return mechanism can be configured with a simple structure.

It is a side view of a transplant machine. It is a top view of a body and a travel device. It is a side view of an airframe and a travel device. It is a side view which shows a part of transplanter. It is a side view of a seedling extraction device. It is a rear view of a seedling extraction device. It is a top view which shows the state which the front-end | tip space | interval of the seedling nail | claw opened. It is a top view which shows the state which the front-end | tip space | interval of the seedling nail | claw was closed. It is a side view of a seedling extraction device. It is a side view which shows the state before a seedling nail pierces a root pot. It is a side view which shows the state which the seedling nail pierced the root pot. It is a side view which shows the state in the middle of transferring the seedling taken out with the seedling claw. It is a side view which shows the state which discharge | released the seedling to the planting body. It is a side view of the rear part of a transplanter. It is a top view of the rear part of a transplanter. It is a rear view of the rear part of a transplanter. It is a side view of a tray mounting member and a tray pressing mechanism. It is a side view of a positioning mechanism. It is a top view of a tray pressing mechanism and a positioning mechanism. It is a side view of the support part of the 1st operation lever. It is an enlarged side view of the support part of the 1st operation lever. It is a top view of the support part of the 1st operation lever. It is the schematic which shows the interlocking | linkage of a 1st operation lever and a main clutch. It is the schematic which shows the interlocking | linkage of a 1st operation lever and a brake. It is a top view of a 1st lever groove. It is a side view of the operation lever of the main clutch engagement state. It is a side view of the 1st operation lever in the middle of clutch disconnection from main clutch engagement. It is a side view of the 1st operation lever of a main clutch disconnection state. It is the schematic of the return mechanism of a raising / lowering cylinder and a raising / lowering lever. It is the schematic of a return mechanism. It is a top view of the support part of a raising / lowering lever. It is the schematic which shows the interlocking of a raising / lowering lever and a raising / lowering valve. It is a top view of a 2nd lever groove. It is a side view which shows the relationship between a return mechanism and a raising / lowering cylinder. It is a top view which shows the relationship between a return mechanism and a raising / lowering cylinder. It is a side view when operating the raising / lowering lever to the 1st raising position. It is a side view which shows the other example of a seedling taking-out apparatus. It is a rear view which shows the other example of a seedling extraction apparatus. It is a top view which shows the state which the front-end | tip space | interval of the seedling picking nail | claw of the seedling picking apparatus of another example opened. It is a top view which shows the state which the front-end | tip space | interval of the seedling picking nail | claw of the seedling picking apparatus of another example closed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a side view of the transplanter 1. The transplanter 1 is a walking type transplanter 1 for planting seedlings in a field. Specifically, the transplanter 1 is referred to as a cell-molded seedling such as a cigarette or a vegetable, a soil block seedling, a pot seedling while moving along the cocoon R1 across the cocoon R1 formed in the field. This is a transplanter 1 for planting seedlings 2 (block seedlings) at predetermined intervals.

In this embodiment, the direction of arrow A1 in FIGS. 1 and 2 is the front, the direction of arrow A2 in FIGS. 1 and 2 is the rear, the direction of arrow B1 in FIG. 2 is the left, and the direction of arrow B2 in FIG. To do.
Moreover, as shown in FIG. 2, the horizontal direction which is a direction orthogonal to the front and rear of the transplanter 1 will be described as the body width direction. The direction from the central part of the transplanter 1 toward the right part or the left part will be described as the outside of the machine body. In other words, the outward direction of the aircraft is the direction away from the transplanter 1 in the width direction of the aircraft. The direction opposite to the outside of the aircraft will be described as the inside of the aircraft. In other words, the in-machine direction is the width direction of the machine body and the direction approaching the transplanter 1.

As shown in FIG. 1, the transplanter 1 includes a body 9, a steering handle 7, a traveling device 10, and a transplanter 4.
The airframe 9 includes a mission case 12, a gantry 13, and a support frame 5. The mission case 12 is located between the gantry 13 and the support frame 5. The gantry 13 is attached to the front part of the mission case 12. The gantry 13 protrudes forward from the mission case 12. The support frame 5 is attached to the rear part of the mission case 12. The support frame 5 protrudes rearward from the mission case 12. Further, the support frame 5 extends upward on the rear end side.

The steering handle 7 is attached to the rear part of the support frame 5 (the rear part of the machine body 9). Further, the steering handle 7 extends rearward from the support frame 5.
As shown in FIG. 1, an engine 11, which is one of prime movers, and a fuel tank 3 are mounted on the gantry 13, that is, on the front portion of the body 9. The power of the engine 11 is input to the mission case 12 via a power transmission mechanism such as a belt transmission mechanism. The power input into the mission case 12 is output from the mission case 12 via a clutch, a transmission mechanism, or the like. The traveling device 10 and the transplant device 4 are driven by the power output from the mission case 12.

As shown in FIGS. 1 to 3, the traveling device 10 includes a left traveling mechanism 6 </ b> L disposed on the left side of the body 9 and a right traveling mechanism 6 </ b> R disposed on the right side of the body 9. The left traveling mechanism 6L includes a front wheel 14L and a crawler traveling body 18L disposed behind the front wheel 14L. The right traveling mechanism 6R also includes a front wheel 14R and a crawler traveling body 18R disposed behind the front wheel 14R.
In the present embodiment, a wheel / crawler combined infinite rotation propulsion mechanism is employed as the traveling device 10. The traveling device 10 is a wheel-type traveling device (in place of the crawler traveling bodies 18L and 18R) composed of front wheels disposed on the left and right of the body 9 and rear wheels disposed on the left and right of the body 9. It may be a traveling device that employs rear wheels.

A left support arm 17L that supports the left front wheel 14L is disposed on the left side of the body 9, and a right support arm 17R that supports the right front wheel 14 is disposed on the right side of the body 9. The left and right support arms 17L and 17R are arranged in an inclined shape that moves upward as going backward. A hexagonal cylindrical left attachment 2 having an axial center in the body width direction on the rear end side (upper end side) of the left support arm 17L.
0L is provided. On the front end side (lower end side) of the left support arm 17L, a left front wheel 14L is supported so as to be rotatable about an axis in the body width direction. On the rear end side (upper end side) of the right support arm 17R, a hexagonal cylindrical right fixture 20R having an axis in the body width direction is provided. On the front end side (lower end side) of the right support arm 17R, the right front wheel 14R is supported so as to be rotatable about an axis in the body width direction.

  A cylindrical first shaft support 22 having an axial core in the body width direction is provided on the rear lower surface side of the gantry 13. The first shaft support 22 is supported by a bracket member 21 that is fixedly attached to the airframe 9 (the mission case 12 and the mount 13). On the left side of the first shaft support 22, the inner end side in the body width direction of the left front wheel support shaft 23L having an axis in the body width direction is inserted. On the right side of the first shaft support 22, an inner end side in the body width direction of the right front wheel support shaft 23R having an axis in the body width direction is inserted. The left and right front wheel support shafts 23L and 23R are supported by the first shaft support 22 so as to be rotatable about the axis in the body width direction.

The outer end side of the left front wheel support shaft 23L in the body width direction is a left arm attachment portion 24L formed of a hexagonal cylinder having an axis in the body width direction. The outer width direction outer end side of the right front wheel support shaft 23R is a right arm mounting portion 24R configured by a hexagonal cylinder having an axis in the body width direction.
A left attachment 20L is externally fitted to the left arm attachment 24L so as to be integrally rotatable, and a right attachment 20R is externally fitted to the right arm attachment 24R. Accordingly, the left support arm 17L is supported by the first shaft support 22 so as to be swingable up and down around the axis of the left front wheel support shaft 23L, and the right support arm 17R is supported by the first shaft support 22 on the right front wheel support shaft 23R. Is supported so as to be swingable up and down.

A left transmission case 19L is disposed on the left side of the body 9 (mission case 12), and a right transmission case 19R is disposed on the right side of the body 9. The left and right transmission cases 19L and 19R are arranged so as to extend rearward from the side surface of the mission case 12.
The front end side (one end side) of the left transmission case 19L is supported on the left side surface of the transmission case 12 via the left case support 25L so as to be rotatable about the axis in the body width direction. The front end side (one end side) of the right transmission case 19R is supported on the right side surface of the transmission case 12 via the right case support 25R so as to be rotatable about the axis in the body width direction. As a result, the rear portions of the left and right transmission cases 19L and 19R can swing up and down. The left crawler traveling body 18L is provided on the rear end side (the other end side) of the left transmission case 19L, and the right crawler traveling body 18R is provided on the rear end side (the other end side) of the right transmission case 19R.

  The left and right front wheel support shafts 23L and 23R are provided with first interlocking members 26L and 26R that protrude rearward. The left and right case supports 25L and 25R are provided with second interlocking members 27L and 27R protruding forward. The first interlocking members 26L, 26R and the second interlocking members 27L, 27R on the same side in the body width direction are connected by interlocking links 28L, 28R.

The left and right case supports 25L and 25R are provided with third interlocking members 29L and 29R extending upward.
In addition, a second shaft support 30 having an axial center in the machine body width direction is supported in a front and rear direction guide groove formed on the left and right of the gantry 13 so as to be movable in the front and rear direction. A support shaft 31 is inserted into the second shaft support 30. The support shaft 31 protrudes from the second shaft support 30 to the left side and the right side. Further, the support shaft 31 is supported by the second shaft support 30 so as to be rotatable about the axis in the body width direction.

An upper lever 32 that protrudes upward is provided on the left side of the support shaft 31. A lower lever 33 that protrudes downward is provided on the right side of the support shaft 31. The upper lever 32 and the left third interlocking member 29L are connected by a left connecting link 34L. The lower lever 33 and the right third interlocking member 29R are connected by a right connection link 34R.
The gantry 13 is provided with an elevating cylinder 36 and a rolling cylinder 37. The elevating cylinder 36 and the rolling cylinder 37 are constituted by double-acting hydraulic cylinders. The lift cylinder 36 is a hydraulic cylinder that lifts and lowers the machine body 9. The rolling cylinder 37 is a hydraulic cylinder that adjusts the inclination of the machine body 9.

An elevating valve 61 and a rolling valve 73 are provided in the upper part of the mission case 12. The lift valve 61 is a valve that controls the lift cylinder 36. The rolling valve 73 is a valve that controls the rolling cylinder 37.
The cylinder tube 36 a of the elevating cylinder 36 is fixed to the gantry 13. The piston rod 36 b of the elevating cylinder 36 can project rearward and is connected to the second shaft support 30.

  Further, the cylinder tube 37a of the rolling cylinder 37 is supported by the gantry 13 so as to be rotatable about an axis in the width direction of the machine body around the pivotal support portion 38 on the front side. The piston rod 37b of the rolling cylinder 37 protrudes toward the rear side. The piston rod 37 b of the rolling cylinder 37 is pivotally attached to the arm 39. The arm 39 is provided on the left side of the support shaft 31 so as to protrude downward.

  When the elevating cylinder 36 is expanded and contracted (the piston rod 36b is advanced and retracted), the second shaft support 30 and the support shaft 31 move back and forth. When the second shaft support 30 and the support shaft 31 move back and forth, the left and right third interlocking members 29L and 29R are pushed and pulled by the left connecting link 34L and the right connecting link 34R. As a result, both the left and right transmission cases 19L and 19R swing up and down. At the same time, the left and right second interlocking members 27L and 27R swing up and down, and the left and right first interlocking members 26L and 26R are pushed and pulled through the left and right interlocking links 28L and 28R. . As a result, the left and right support arms 17L and 17R both swing up and down (the left and right support arms 17L and 17R move up and down in conjunction with the vertical swing of the left and right transmission cases 19L and 19R). Swings).

  The left and right transmission cases 19L and 19R and the left and right support arms 17L and 17R both swing up and down, so that the left and right front wheels 14L and 14R and the left and right crawler traveling bodies 18L and 18R Simultaneously move up and down relatively with respect to the body 9. And since the front wheels 14L and 14R and the crawler traveling bodies 18L and 18R are in contact with the ground, the body 9 inevitably moves up and down with respect to the contact surface.

In this embodiment, when the elevating cylinder 36 is extended (the piston rod 36b is advanced toward the rear), the machine body 9 is raised, and when the elevating cylinder 36 is contracted (the piston rod 36b is moved back toward the front), the airframe is 9 goes down.
Further, when the rolling cylinder 37 is expanded and contracted (the piston rod 37b is advanced and retracted), the support shaft 31 is rotated, the left connecting link 34L presses the left third interlocking member 29L, and the right connecting link 34 is connected to the right side. 3 The interlocking member 29R is pulled. Then, the front wheels 14L and 14R and the crawler traveling bodies 18L and 18R on one side in the width direction of the body rise relatively with respect to the body 9 and the front wheels 14L and 14R and the crawler traveling bodies 18L and 18R on the other side Descends relative to Thereby, the inclination of the body 9 with respect to the body width direction can be automatically corrected (automatically adjusted).

Therefore, for example, when the aircraft body 9 is tilted upward, the left front wheel 14L and the crawler traveling body 18L are lowered, the right front wheel 14R and the crawler traveling body 18R are raised, and the aircraft body 9 is horizontally controlled.
Output shafts (not shown) are provided on the left and right sides of the mission case 12. Power from the engine 11 is transmitted to the output shaft via a power transmission mechanism in the mission case 12. As shown in FIG. 3, on the rear end side (the other end side) of the left and right transmission cases 19L, 19R, a drive shaft 40 that drives the crawler traveling bodies 18L, 18R is rotatable about the axis in the body width direction. It is supported by. The power is transmitted from the output shaft to the left and right drive shafts 40 through a power transmission mechanism provided in the transmission case 19, whereby the drive shaft 40 is rotated.

As shown in FIG. 3, the crawler traveling bodies 18 </ b> L and 18 </ b> R include upper drive wheels 41 (sprockets), a front idler 42, a rear idler 43, a crawler belt 15, and a swing frame 44. The drive wheel 41 is driven by the drive shaft 40. The front idler 42 is disposed on the front side and the lower side of the drive wheel 41. The rear idler 43 is disposed on the rear side and the lower side of the drive wheel 41. The crawler belt 15 includes a drive wheel 41 and front and rear idlers 42.
, 43 is an endless belt. The swing frame 44 is swingable back and forth around the axis X1 of the drive shaft 40. A front idler 42 and a rear idler 43 are attached to the swing frame 44. When the driving wheel 41 is rotated by the driving shaft 40, the crawler belt 15 engaged with the driving wheel 41 is circulated (rotated) in the circumferential direction (longitudinal direction), and the crawler traveling body 18 moves forward or backward.

  As shown in FIG. 1, the transplanting device 4 includes a seedling platform 46, a planting device 45, a seedling removal device 47, a plurality of pressure reducing wheels 49 (covering rings), and a leveling roller 50 (detection roller). I have. The seedling mount 46 supports and supports the tray T1 containing the seedling 2. The planting device 45 is a device for planting the supplied seedling 2 to the cocoon R1 with the planting body 48. The seedling extraction device 47 is a device that takes out the seedling 2 from the tray T1 on the seedling mount 46 and supplies it to the planting body 48. The plurality of pressure-reducing wheels 49 are members that repress both sides of the seedling 2 planted in the ridge R1 in the body width direction. The leveling roller 50 rolls on the upper surface of the rod R1 on the front side of the planting body 48.

The tray T1 is made of plastic, is thin, and has flexibility. The tray T1 is formed in a rectangular shape in plan view in which the vertical direction is longer than the horizontal direction (see FIG. 15). The tray T1 includes a large number of pot portions P1 arranged in a grid pattern at a predetermined pitch in the vertical and horizontal directions. The opening edge part of each pot part P1 is mutually connected by the flat thin wall part.
A seedling 2 is accommodated in each pot portion P1 of the tray T1. In the present embodiment, on the tray T1, seedlings 2 (soil block seedlings) grown by seeding on the floor soil supplied to the pot portions P1 are grown.

  The seedling platform 46 is disposed on the front side and in the vicinity of the steering handle 7. The seedling mount 46 is arranged in an inclined shape that moves downward as it goes forward. The seedling mount 46 has a mounting plate 35 on which the bottom of the tray T1 is mounted and supports the tray T1. The mounting plate 35 is inclined so as to move downward as it goes forward. The tray T1 is placed on the placement plate 35 with the vertical direction coinciding with the inclination direction of the placement plate 35. Further, the seedling table 46 is supported at the rear portion of the support frame 5 so as to be movable in the machine body width direction.

  Further, the seedling platform 46 is intermittently laterally fed in the body width direction by one pitch of the pot portion P1 in the lateral direction (machine body width direction) of the tray T1 by the lateral feed mechanism. Further, the seedling stage 46 can be reciprocated in the body width direction by the lateral feed mechanism. Further, the seedling platform 46 is provided with a vertical feed mechanism that vertically feeds the tray T1 downward by one pitch of the pot portion P1 in the vertical direction at the left and right ends of the moving range in the machine width direction. It has been.

  As shown in FIG. 4, the planting device 45 includes a planting body 48 and an elevating mechanism 53. The planted body 48 has an open upper end so that the seedling 2 can be supplied from above. The planted body 48 is openable and closable at the bottom, can hold the seedling 2 in the closed state, and can open the seedling 2 downward when opened. The elevating mechanism 53 is a mechanism for elevating the planted body 48. The lifting mechanism 53 is supported by the planting frame 52. The front end side of the planting frame 52 is supported on the side surface of the mission case 12 so as to be rotatable about an axis in the body width direction. Thereby, the planting frame 52 can be swung up and down.

  The mission case 12 is provided with an extraction shaft 54 concentrically with the rotational axis of the front end of the planting frame 52. Power is transmitted to the take-out shaft 54 from a power transmission mechanism in the mission case 12. The power from the take-out shaft 54 is transmitted to the lifting mechanism 53 via a chain winding transmission mechanism in a power case 55 provided in the planting frame 52. Thereby, the raising / lowering mechanism 53 is driven.

  The planting body 48 is supplied with the seedling 2 from the seedling extracting device 47 in a closed state at the top dead center at or near the top dead center of the vertical movement range. Thereafter, the planting body 48 descends with the seedling 2 held inside, and enters and opens the ridge R1 on the bottom dead center side in the vertical movement range. Thereby, the planting body 48 forms a planting hole in the ridge R1 and releases the seedling 2 into the planting hole. In this way, the seedling 2 is planted in the cocoon R1.

The seedling extraction device 47 includes a plurality of seedling extraction claws 51 that extract the seedling 2 from the pot portion P1. The seedling removal device 47 includes a motion mechanism that is driven by power from the planting power transmission mechanism in the mission case 12 to operate the seedling picking claws 51. The seedling picking device 47 advances the seedling picking claw 51 from the front side (in the present embodiment, moving backward) with respect to the root pot 2a in the pot portion P1, and pierces the root pot 2a with the seedling picking nail 51. The seedling removal device 47 allows the seedling 2 to be removed from the pot portion P1 by retreating the seedling removal claw 51 from the tray T1 (in this embodiment, moving forward) after the root pot 2a is pierced by the seedling removal claw 51. . In addition, the seedling 2 taken out from the pot part P1 is transported above the planting body 48 located at the seedling receiving position and can be released to the planting body 48. Moreover, the seedling 2 (root pot 2a) can be taken out from all the pot parts P1 by moving the tray T1 in the horizontal direction and the vertical direction.

The plurality of pressure reducing wheels 49 are provided on the rear side of the planting body 48. The plurality of pressure wheels 49 include a pressure wheel 49 provided on the left side of the planted body 48 and a pressure wheel 49 provided on the right side of the planted body 48. The pressure ring 49 rolls on the side of the planting position of the seedling 2 on the upper surface of the heel R1. Further, the pressure-reducing wheel 49 presses the soil on the side of the seedling 2 put into the planting hole formed by the planting body 48.
The pressure reducing wheel 49 is supported on the rear side of the planting frame 52 via a support mechanism 56. The rear side of the planting frame 52 is supported by the pressure ring 49. The planting depth can be changed by changing the distance between the pressure reducing wheel 49 and the planting frame 52 in the vertical direction.

The leveling roller 50 rolls on the upper surface of the ridge R1 on the front side of the planting body 48, levels the upper surface of the ridge R1, and detects the height of the ridge R1.
A swing arm 58 that can swing up and down is provided on the lower end of the front portion of the mission case 12. The front portion of the swing arm 58 is supported by a lower portion of the first sensor arm 59 via a shaft 57 so as to be rotatable about an axis in the body width direction. A leveling roller 50 is supported on the rear side of the swing arm 17 so as to be rotatable about an axis in the width direction of the machine body. The leveling roller 50 rolls on the upper surface of the ridge R1 following the upper surface of the ridge R1.

  The vertical movement of the leveling roller 50 with respect to the transmission case 12 is transmitted to the lift valve 61 by the first sensor arm 59 and the second sensor arm 60 that swing together with the swing arm 58. By controlling the elevating cylinder 36 by the elevating valve 61, the airframe 9 is controlled to move up and down so that the distance from the upper surface of the rod R1 is kept constant. Thus, the seedling 2 is planted at a planting depth set by the planting frame 52 moving up and down following the height of the cocoon.

  On the other hand, the movement of the pressure reducing wheel 49 relative to the mission case 12 in the vertical direction is transmitted from the planting frame 52 to the lift valve 61 via the interlocking mechanism 62. Therefore, the traveling machine body 9 can be controlled to move up and down so that the distance from the upper surface of the kite R1 is kept constant by the movement of the pressure reducing wheel 49. Further, when the leveling roller 50 detects the height of the kite, the movement of the pressure reducing wheel 49 is not transmitted to the lift valve 61.

  As shown in FIGS. 5 and 6, the seedling extraction device 47 has a claw support 71. The claw support 71 includes a base member 72, a support block 73 (support member), a plurality of claw attachment portions 74 </ b> A and 74 </ b> B, a stopper 75, and a roller 76. The base member 72 is formed of a plate material whose plate surface faces the machine body width direction. The support block 73 is fixed to the base member 72. The right portion of the support block 73 is fixed to the base member 72 and protrudes leftward from the base member 72. The left portion of the support block 73 is a first support portion 77A. The right part of the support block 73 is a second support part 77B. A recessed portion 78 is formed between the first support portion 77 </ b> A and the second support portion 77 </ b> B of the support block 73.

As shown in FIGS. 5, 6, and 7, the plurality of claw mounting portions 74A and 74B include a first claw mounting portion 74A and a second claw mounting portion 74B. The first claw mounting portion 74A and the second claw mounting portion 74B are formed of a plate-like body that is long in one direction. Further, the first claw mounting portion 74A and the second claw mounting portion 74B are arranged side by side in the body width direction with the plate width direction coinciding with the body width direction.
One end of the first claw mounting portion 74A is supported by the first support portion 77A via the first mounting shaft 79A. The first claw mounting portion 74A can rotate around the axis of the first mounting shaft 79A. One end of the second claw attachment portion 74B is supported by the second support portion 77B via the second attachment shaft 79B. The second claw mounting portion 74B can rotate around the axis of the second mounting shaft 79B. The first attachment shaft 79A and the second attachment shaft 79B have axial centers in a direction orthogonal to the body width direction. The axis of the first attachment shaft 79A and the axis of the second attachment shaft 79B are parallel to each other.

The first claw attachment portion 74A is provided with a first engagement portion 81A. The first engagement portion 81A extends from one end of the first claw attachment portion 74A toward the second claw attachment portion 74B (second seedling claw 51B). Further, the first engaging portion 81A is configured by an extending piece that integrally extends from the first claw mounting portion 74A.
A second engagement portion 81B is provided on the second claw attachment portion 74B. The second engagement portion 81B extends from one end of the second claw attachment portion 81B toward the first claw attachment portion 74A (first seedling claw 51A). Further, the second engaging portion 81B is constituted by an extending piece that integrally extends from the second claw attaching portion 74B. The first engaging portion 81A and the second engaging portion 81B overlap each other.

  The other end of the first claw mounting portion 74A is a first spring hook 82A. The other end of the second claw attaching portion 74B is a second spring hooking portion 82B. One end of a biasing member 83 (referred to as a first biasing member) made of a tension coil spring is hooked on the first spring hooking portion 82A. The other end of the first urging member 83 is hooked to the second spring hooking portion 82B. Accordingly, the first urging member 83 urges the other end of the first claw attaching portion 74A and the second claw attaching portion 74B in the direction in which they are brought close to each other.

  A first mounting wall 84A is provided on the other end side of the first claw mounting portion 74A. The first mounting wall 84A is provided closer to the first mounting shaft 79A than the first biasing member 83. A first lock nut 86a and a first support nut 86b are provided across the first mounting wall 84A. The first support nut 86b is fixed to the first mounting wall 84A. A first adjustment member 85A made of a bolt is screwed into the first support nut 86b. The first adjustment member 85A passes through the first mounting wall 84A. A first lock nut 86a is screwed into the first adjustment member 85A.

  A second mounting wall 84B is provided on the other end side of the second claw mounting portion 74B. The second mounting wall 84B is provided closer to the second mounting shaft 79B than the first biasing member 83. A second lock nut 87a and a second support nut 87b are provided across the second mounting wall 84B. The second support nut 867 is fixed to the second mounting wall 84B. A second adjustment member 85B made of a bolt is screwed into the second support nut 87b. The second adjustment member 85B passes through the second mounting wall 84B. A second lock nut 87a is screwed into the second adjustment member 85B.

  The stopper 75 is formed of a plate material and includes a stopper portion 88 and a support wall portion 89. The stopper portion 88 is located between the first adjustment member 85A and the second adjustment member 85B. The stopper 88 can contact the tip of the first adjustment member 85A and the tip of the second adjustment member 85B. The support wall portion 89 extends from the end portion of the stopper portion 88 and is fixed to the base member 72. 85 A of 1st adjustment members can be advanced / retreated with respect to the stopper part 88 by loosening the 1st lock nut 86a. The second adjustment member 85B can be advanced and retracted with respect to the stopper portion 88 by loosening the second lock nut 87a.

  The roller 76 is supported by a roller shaft 90 fixed to the base member 72. The roller shaft 90 has an axis in the body width direction, and supports the roller 76 so as to be rotatable around the axis. As shown in FIG. 9, the roller 76 is fitted in a guide groove 92 formed in the guide member 91. Further, the roller 76 is movable in the guide groove 92. As shown in FIG. 1, the guide member 91 is attached to the attachment plate 93. The mounting plate 93 is fixed to a support base 94 fixed to the support frame 5.

As shown in FIGS. 5, 6, and 7, the seedling extraction device 47 includes the plurality of seedling extraction claws 51 </ b> A and 51 </ b> B described above. The plurality of seedling nails 51A and 51B include a first seedling nail 51A and a second seedling nail 51B. The first seedling claw 51A and the second seedling claw 51B are formed of a bar material. The first seedling claw 51A and the second seedling claw 51B are juxtaposed in the body width direction.
The first seedling claw 51A has a tapered front end portion 95A and a base portion 96A bent into a U shape. The base portion 96A of the first seedling catching claw 51A is fixed to the first claw attachment portion 74A by a first fixing tool 97 and a second fixing tool 98. The 1st fixing tool 97 is comprised from the volt | bolt and the nut. The 2nd fixing tool 98 is comprised from the screw shaft and nut extended from 79 A of 1st attachment shafts. 51 A of 1st seedling nail | claws protrude from 74 A of 1st nail | claw attaching parts in the direction which goes to one end part from the other end part of 74 A of 1st claw attaching parts.

  The second seedling claw 51B has a tapered tip end portion 95B and a base portion 96B bent into a U shape. The base 96B of the second seedling claw 51B is fixed to the second claw attaching portion 74B by the third fixing tool 99 and the fourth fixing tool 100. The 3rd fixing tool 99 is comprised from the volt | bolt and the nut. The 4th fixing tool 100 is comprised from the volt | bolt axis | shaft extended from the 2nd attachment axis | shaft 79B, and the nut. The second seedling claw 51B protrudes from the second claw attachment portion 74B in a direction from the other end portion of the second claw attachment portion 74B toward the one end portion.

  The first seedling claw 51A rotates integrally with the first claw mounting portion 74A around the axis of the first mounting shaft 79A. The second seedling claw 51B rotates integrally with the second claw attachment portion 74B around the axis of the second attachment shaft 79B. Thus, the first seedling claw 51A and the second seedling claw 51B are pivotally supported by the claw support 71. Further, the first claw attachment portion 74A rotates around the axis of the first attachment shaft 79A, and the second claw attachment portion 74B rotates around the axis of the second attachment shaft 79B, whereby the first seedling claw 51A. And the tip distance D1 between the first seedling claw 51B and the second seedling claw 51B are enlarged or reduced.

Further, since the first seedling claw 51A and the first engagement portion 81A are provided in the first claw attachment portion 74A, the first seedling claw 51A and the first engagement portion 81A rotate integrally. In addition, since the second seedling claw 51B and the second engagement portion 81B are provided in the second claw attachment portion 74B, the second seedling claw 51B and the second engagement portion 81B rotate integrally.
The first urging member 83 urges the first seedling claw 51 </ b> A and the second seedling claw 51 </ b> B in a direction to increase the tip end distance D <b> 1. By moving the first adjustment member 85A and the second adjustment member 85B forward and backward with respect to the stopper portion 88, the interval adjustment of the tip interval D1 between the first seedling claw 51A and the second seedling claw 51B is possible. .

As shown in FIGS. 6 and 9, the seedling removal device 47 has a movement mechanism 101 that moves the nail support 71. The motion mechanism 101 includes an input shaft 102, a rotary case 103, a crankshaft 104, a crank arm 105, and a base support shaft 106. The input shaft 102, the crankshaft 104, and the base support shaft 106 have axial centers in the body width direction.
One end of the input shaft 102 is supported by a gear box (not shown) fixed to the support base 94. The other end of the input shaft 102 is inserted into the rotary case 103. The power output from the mission case 12 is transmitted to the input shaft 102, whereby the input shaft 102 rotates.

  The rotary case 103 is supported by the support base 94 so as to be rotatable about the axis of the input shaft 102. The rotary case 103 rotates integrally with the input shaft 102. A planetary gear mechanism (not shown) is provided in the rotary case 103. The planetary gear mechanism includes a sun gear that is rotatably fitted to the input shaft 102, an intermediate gear that meshes with the sun gear, and a planetary gear that meshes with the intermediate gear.

One end of the crankshaft 104 is inserted into the rotary case 103 and fixed to the planetary gear. One end side of the crank arm 105 is fixed to the other end side of the crankshaft 104. A base support shaft 106 is fixed to the other end side of the crank arm 105. The base support shaft 106 rotatably supports the base member 72 via a bearing 107.
As shown in FIG. 9, when the input shaft 102 rotates, the rotary case 103 rotates integrally with the input shaft 102 in the direction of arrow C1. When the rotary case 103 rotates in the direction of arrow C1, the crank arm 105 rotates in the direction of arrow C2 around the axis of the crankshaft 104. As a result, the base support shaft 106 moves on the flat elliptical axis movement locus K1, and the claw support 71 reciprocates. Further, the roller 76 moves in the guide groove 92 as the base support shaft 106 moves on the axis movement locus K1. As the roller 76 moves in the guide groove 92, the posture of the claw support 71 is controlled. The first seedling claw 51A and the second seedling claw 51B are combined by combining the movement of the base support shaft 106 moving on the axis movement locus K1 and the movement of the roller 76 moving in the guide groove 92. The tip of the movement moves so as to draw a claw movement locus K2.

On the upper side of the claw movement locus K2, the claw support 71 advances and retreats with respect to the tray T1 having the seedling 2. Then, the first seedling claw 51A and the second seedling claw 51B advance toward the pot part P1, pierce the root pot 2a, and then move backward to take out the root pot 2a from the pot part P1. Further, when the nail support 71 reaches the lower end of the nail movement locus K2 after taking out the seedling 2 from the pot portion P1, the first seedling nail 51A and the second seedling nail 51B have their tips facing downward. The posture is changed to be in the vertical orientation.

  A cam 108 is fixed to the base support shaft 106. When the crank arm 105 rotates around the crankshaft 104, the cam 108 rotates relative to the base member 72 (claw support 71) in the direction of arrow C3 together with the base support shaft 106. The cam 108 has a small diameter portion 108a and an action portion 108b. The action part 108b is larger in diameter than the small diameter part 108a. Further, the action portion 108b is gradually increased in diameter from the front to the rear in the rotation direction.

  As shown in FIGS. 5 and 6, the seedling extraction device 47 has a swing member 111. The swing member 111 is formed of a plate material and has a cylindrical boss portion 112. The boss portion 112 is externally fitted to the swing support shaft 109 fixed to the base member 72 so as to be rotatable about the axis. The swing support shaft 109 has an axis in the body width direction. The swing member 111 swings around the axis of the swing support shaft 109 with respect to the base member 72.

A cam follower 113, a first pusher 114A, a second pusher 114B, and a pressing member 116 are attached to the swing member 111.
The cam follower 113 is rotatably supported by a follower shaft 117 fixed to the swing member 111. The cam follower 113 contacts the circumferential surface of the cam 108 and moves on the circumferential surface of the cam 108. The cam follower 113 is pressed against the peripheral surface of the cam 108 by a biasing force of a biasing member 118 (referred to as a second biasing member). The second urging member 118 is constituted by a tension coil spring. One end of the second urging member 118 is hooked on a first hooking portion 119 provided on the swinging member 111. The other end of the second urging member 118 is hooked on a second hooking portion 120 provided on the support block 73.

  The first pusher 114A and the second pusher 114B are formed of a wire. The first pusher 114A has a first base 121A that is bent into a circular shape. The first base portion 121 </ b> A is pivotally supported by an attachment pin 123 provided in the pin attachment portion 122 of the swing member 111. The second pusher 114B has a second base 121B bent into a circular shape. The second base 121B is also pivotally supported by the mounting pin 123. The mounting pin 123 has an axis in the body width direction. The first pusher 114A and the second pusher 114B can swing in the body width direction.

  A ring-shaped first pushing portion 124A is formed at the tip of the first pushing tool 114A. The first seedling claw 51A is inserted through the first pushing portion 124A. The first extruding portion 124A can move the first seedling catching claw 51A in the longitudinal direction. A ring-shaped second pushing portion 124B is formed at the tip of the second pushing tool 114B. A second seedling claw 51B is inserted through the second pushing portion 124B. The second pushing portion 124B is configured to be able to move the second seedling catching claw 51B in the longitudinal direction.

The pressing member 116 is configured by a spring member. In the present embodiment, the pressing member 116 is configured by an elastic wire, and specifically, is formed by an elastic wire such as a piano wire. A base portion 116 a of the pressing member 116 is formed in an arc shape surrounding the boss portion 118. The pressing member 116 includes a first fixing part 116b extending from one end of the base part 116a and a second fixing part 116c extending from the other end of the base part 116a. The first fixing portion 116b and the second fixing portion 116c are fixed to the swing member 111 by a fixing tool 125. Therefore, the pressing member 116 swings integrally with the swing member 111 around the swing support shaft 109. The pressing member 116 has a contact portion 116d extending from the first fixing portion 116b. The contact portion 116d is configured such that the swing member 111 swings in a direction in which the contact portion 116d approaches the first engagement portion 81A and the second engagement portion 81B, whereby the first engagement portion 81A and the second engagement portion 81d. It can be brought into contact with the engaging portion 81B. Further, when the contact portion 116d contacts the first engagement portion 81A and the second engagement portion 81B, the contact portion 116d enters the recessed portion 78,
The contact portion 116d is prevented from interfering with the support block. The contact portion 116d is elastically deformable.

The operation of the seedling removal device 47 described above will be described.
FIG. 10 shows a state immediately before the first seedling claw 51A and the second seedling claw 51B pierce the root pot 2a of the seedling 2. In this state, the cam follower 113 is located in the small diameter portion 108 a of the cam 108. Further, the contact portion 116d is located at a position away from the first engagement portion 81A and the second engagement portion 81B toward the distal ends of the first seedling claw 51A and the second seedling claw 51B. In a state where the contact portion 116d is separated from the first engagement portion 81A and the second engagement portion 81B, the tip interval D1 between the first seedling claw 51A and the second seedling claw 51B is open. Yes (see FIG. 7). In addition, the first pushing portion 124A is located on the tip side of the first seedling catching claw 51A, and the second pushing portion 124B is located on the tip side of the second seedling catching claw 51B (see FIG. 7).

  When the input shaft 102 rotates from the state shown in FIG. 10, as shown in FIG. 11, the base support shaft 106 moves in a direction close to the seedling mount 46, and the first seedling claw 51A and the second seedling removal The root pot 2a is pierced at the tip side of the nail 51B. On the other hand, the cam follower 113 is pressed by the action part 108 b of the cam 108. Then, the swing member 111 swings about the swing support shaft 109 in a direction away from the tips of the first seedling catching claw 51A and the second seedling catching claw 51B. At this time, the swing member 111 swings against the biasing force of the second biasing member 118. The first pusher 114 </ b> A, the second pusher 114 </ b> B, and the pressing member 116 swing together with the swing member 111. Accordingly, the first pusher 114A and the second pusher 114B move to positions where the first pusher 124A and the second pusher 124B do not interfere with the root pot 2a. In addition, when the pressing member 116 swings integrally with the swinging member 111, the contact portion 116d presses the first engaging portion 81A and the second engaging portion 81B. As shown in FIG. 8, when the contact portion 116d presses the first engaging portion 81A and the second engaging portion 81B, the first seedling claw 51A and the first seedling claw 51A are resisted against the urging force of the first urging member 83. The second seedling claw 51B rotates in a direction to reduce the tip interval D1. Accordingly, the pressing member 116 (the contact portion 116d) presses the first engaging portion 81A and the second engaging portion 81B when the first seedling claw 51A and the second seedling claw 51B pierce the root pot 2a. Then, the tip interval between the first seedling claw 51A and the second seedling claw 51B is reduced. Thereby, the soil inside the root pot 2a is sandwiched between the tip ends of the first claw mounting portion 74A and the second claw mounting portion 74B, and the root pot 2a is securely held.

When the input shaft 102 further rotates from the state shown in FIG. 11, the cam follower 113 is pressed by the action part 108b (the root pot 2a is held on the tip side of the first claw mounting part 74A and the second claw mounting part 74B). While the state is maintained, the claw support 71 moves backward in a direction away from the tray T1. Thereby, the root pot 2a is taken out from the pot part P1.
As shown in FIG. 12, by further rotating the input shaft 102, the posture of the claw support 71 is changed while the cam follower 113 is pressed by the action portion 108b, and the seedling 2 moves to the lower end of the claw movement locus K2. Moving.

  As shown in FIG. 13, when the tips of the first seedling catching claw 51A and the second seedling catching claw 51B move to the lower end of the claw movement locus K2, the cam follower 113 is removed from the action part 108b (the restriction by the action part 108b is released). ), The cam follower 113 falls into the small diameter portion 108a. Then, due to the urging force of the second urging member 118, the oscillating member 111 oscillates around the oscillating support shaft 109 in a direction close to the tips of the first seedling claw 51A and the second seedling claw 51B. As a result, the first extruding part 124A moves to the tip side of the first seedling catching claw 51A and the second pushing part 124B moves to the tip side of the second seedling catching claw 51B. Then, the root pot 2a is pushed by the first extruding part 124A and the second extruding part 124B, and the seedling 2 is released downward (to the planting body 48) from the first seedling nail 51A and the second seedling nail 51B. . At the same time, the contact portion 116d is separated from the first engagement portion 81A and the second engagement portion 81B. Then, the tip interval D1 is expanded, and simultaneously with the release of the seedling 2, the holding of the soil inside the root pot 2a by the first seedling claw 51A and the second seedling claw 51B is released.

In the seedling extraction device 47 described above, when the swing member 111 swings, the pressing member 116 (the contact portion 116d thereof) contacts the first engagement portion 81A and the second engagement portion 81B. Thus, the first seedling claw 51A and the second seedling claw 51B are configured to reduce the tip distance D1. Further, when the pressing member 116 (the contact portion 116d thereof) is separated from the first engaging portion 81A and the second engaging portion 81B, the first seedling claw 51A and the second seedling are urged by the urging force of the first urging member 83. The tip interval D1 of the catch nail 51B is increased. By adopting this structure, it is possible to reduce the wear of the components of the seed take-out device 47. In addition, a mechanism for expanding and contracting the tip interval D1 between the first seedling claw 51A and the second seedling claw 51B by the pressing member 116, the first engagement portion 81A, the second engagement portion 81B, and the first biasing member 83. Since it is comprised, the simplification of the structure of the seedling extraction apparatus 47 can be achieved.

Further, by forming the pressing member 116 with a spring member, the tips of the first seedling claw 51A and the second seedling claw 51B are pierced into the root pot 2a of the seedling 2, and the soil inside the root pot 2a is made into the first seedling. When sandwiched between the catch claws 51A and the second seedling catch claws 51B, it is possible to prevent the soil inside the root pot 2a from being pinched too much by the elastic force of the spring member. This can prevent the root pot 2a from collapsing. In addition, force is applied in the closing direction even after the distal end sides of the first seedling claw 51A and the second seedling claw 51B are closed. The first engagement portion 81A is moved from the first claw attachment portion 74A to the second. The structure can be simplified by extending toward the claw mounting portion 74B and extending the second engagement portion 81B from the second claw mounting portion 74B toward the first claw mounting portion 74A. .

Moreover, the pressing member 116 can be comprised compactly by making the 1st engaging part 81A and the 2nd engaging part 81B overlap.
Further, by providing the stopper 75, the first adjustment member 85A, and the second adjustment member 85B, the tip interval D1 between the first seedling claw 51A and the second seedling claw 51B can be changed. Moreover, the member which closes the front end side of the 1st seedling nail 51A and the 2nd seedling nail 51B, and the member which changes the front end space | interval D1 of the 1st seedling nail 51A and the 2nd seedling nail 51B are separate members. Therefore, the opening amount of the first seedling claw 51A and the second seedling claw 51B can be adjusted regardless of the closing amount.

  As shown in FIGS. 14 and 15, the rear portion of the support frame 5 includes a first frame material 131 </ b> A on the left side, a second frame material 131 </ b> B on the right side, and a connecting material 133 (support material). The first frame member 131A, the second frame member 131B, and the connecting member 133 are formed of a pipe member. The first frame member 131A and the second frame member 131B are provided with an interval in the body width direction. The first frame member 131A and the second frame member 131B are inclined such that the front portion is along the front-rear direction and the rear portion is shifted upward as it goes rearward. Further, the distance between the first frame member 131A and the second frame member 131B is parallel from the front end to the middle part, and gradually increases from the middle part to the rear.

The connecting member 133 connects the middle parts of the portion where the distance between the first frame member 131A and the second frame member 131B is increased.
The steering handle 7 is formed of a pipe material, and includes a first collar part 134A, a second collar part 134B, and a third collar part 134C. The first brim part 134A is arranged at an interval to the left of the second brim part 134B. The third collar part 134C connects the rear ends of the first collar part 134A and the second collar part 134B. The front portions of the first flange portion 134A and the second flange portion 134B are inclined so as to move downward as going forward. The rear portions of the first flange portion 134A and the second flange portion 134B are along the front-rear direction. The front portion of the first flange portion 134A is connected to the rear portion of the first frame member 131A. The front portion of the second flange 134B is connected to the rear portion of the second frame member 131B.

An operation panel 135 is provided at the rear of the steering handle 7. The operation panel 135 is provided across the first collar part 134A and the second collar part 134B.
A plurality of operating levers 136 and 137 are supported on the steering handle 7. The plurality of operation levers 136 and 137 include a first operation lever 136 and a second operation lever 137.
As shown in FIGS. 14 and 16, the seedling mount 46 is provided in the rear part of the machine body 9 and in the vicinity of the front side of the steering handle 7. At the rear part of the support frame 5 (the rear part of the machine body 9), a stand frame 138 for supporting the seedling placing stand 46 is provided. The base frame 138 is a frame that is movably supported in the body width direction. The base frame 138 includes a left frame 139L, a right frame 139R, an upper connection frame 140, and a lower connection frame 141. The upper connection frame 140 connects upper portions of the left frame 139L and the right frame 139R.
The lower connection frame 141 connects lower portions of the left frame 139L and the right frame 139R.

Further, the tray T <b> 1 that is vertically fed on the placement plate 35 is guided by the guide rod 142 on the lower end side of the seedling placing table 46 and is transferred to the back side of the seedling placing table 46. The empty tray T1 from which the seedling 2 has been taken out is pushed by the next tray T1 and transported upward on the back side of the seedling mount 46. The empty tray T1 is drawn upward and taken out from the guide rod 142.
As shown in FIGS. 1 and 14, a tray mounting member 143 is provided at the rear portion of the support frame 5 (machine body 9). The tray placement member 143 can be repositioned to a placement position E1, a stand position E2, and a storage position E3. The placement position E1 is a position where an empty tray T1 is placed. The stand position E <b> 2 is a position that supports the rear part of the body 9 when the transplanter 1 is not used. Therefore, the tray mounting member 143 is also used as a rear stand. The storage position E3 is a position when the seedling 2 is not planted and the tray mounting member 143 is not used as a stand, such as when the transplanter 1 is moved.

  As shown in FIG. 1, a front stand 144 that supports the front portion of the airframe 9 is provided at the front portion of the airframe 9. The position of the front stand 144 can be changed between a stand position indicated by a virtual line and a storage position indicated by a solid line. The machine body 9 can be supported by the front stand 144 and the tray mounting member 143 by lowering the machine body 9 with the front stand 144 set to the stand position and the tray mounting member 143 set to the stand position.

  As shown in FIG. 14, the tray mounting member 143 is disposed on the lower side (back side) of the seedling table 46 and below the steering handle 7. The tray mounting member 143 is substantially horizontal at the mounting position E1 and is spaced from the steering handle 7. As shown in FIG. 15, the tray placing member 143 is located within the width of the steering handle 7 in the body width direction and at the center between the first brim part 134A and the second brim part 134B. In addition, the tray mounting member 143 is attached to the connecting member 133.

As shown in FIG. 15, the tray mounting member 143 includes a main body portion 146, a first fitting portion 147 </ b> A, a second fitting portion 147 </ b> B, a retaining member 148, and a tray locking member 149.
The main body 146 is formed of a pipe material and has a first part 150A, a second part 150B, a third part 150C, and a fourth part 150D. The first part 150A is arranged at an interval to the left of the second part 150B. The third portion 150C connects one end portions of the first portion 150A and the second portion 150B. The fourth part 150D connects the middle parts of the first part 150A and the second part 150B.

  As shown in FIG. 17, the first fitting portion 147A is fixed to the other end of the first portion 150A. The first fitting portion 147A is formed in a U shape, and is fitted to the connecting member 133 so as to be rotatable around the axis. The first fitting portion 147A is secured from the connecting member 133 by a retaining pin 151. The retaining pin 151 is inserted through the one end wall 152 and the other end wall 153 of the first fitting portion 147A.

  As shown in FIG. 18, the second fitting portion 147B is fixed to the other end of the second portion 150B. The second fitting portion 147B is formed in a U shape and is fitted to the connecting member 133 so as to be rotatable around the axis. The second fitting portion 147 </ b> B is secured from the connecting member 133 by the retaining member 148. The retaining member 148 includes a first wall 152, a second wall 153, and a third wall 154. One end of the first wall 152 is fixed to the second portion 150B by a bolt 158. The bolt 158 is screwed into a nut member 157 fixed to the second portion 150B. The second wall 153 extends from the other end side of the first wall 152. Further, the second wall 153 is in contact with the end portions of the one end wall 159 and the other end wall 160 of the second fitting portion 147B. The third wall 154 extends from the end portion of the second wall 153 and is formed along the one end wall 159 of the second fitting portion 147B. A space is provided between the second wall 153 and the connecting member 133. Thereby, the 2nd fitting part 147B and the 2nd site | part 150B can be moved to the radial direction outer side of the connection material 133. As shown in FIG.

As shown in FIGS. 15, 16, and 17, the tray locking member 149 is formed of a bar material. The tray locking member 149 is provided on the upper side of the tray mounting member 143 at the mounting position E1. The tray locking member 149 includes a first locking portion 161A, a second locking portion 161B, a third locking portion 161C, a first leg portion 162A, and a second leg portion 162B. The first locking portion 161A is provided along the first portion 150A. In addition, the first locking portion 161A is provided at a distance from the first portion 150A. The second locking portion 161B is provided along the second portion 150B. The second locking portion 161B is provided at a distance from the second portion 150B. The third locking portion 161C connects one end portions of the first locking portion 161A and the second locking portion 161B. The first leg portion 162A connects the other end portion of the first locking portion 161A and the first portion 150A. The second leg portion 162B connects the other end portion of the second locking portion 161B and the second portion 150B.

  As shown in FIG. 15, the empty tray T1 is placed on the tray placement member 143 at the placement position E1. The tray T1 is placed on the tray placing member 143 so that the vertical direction is the body width direction. The first locking portion 161A, the second locking portion 161B, and the third locking portion 161C are fitted between the pot portions P1, thereby positioning the tray T1 in the front-rear direction and the machine body width direction.

As shown in FIG. 15, the transplanter 1 has a positioning mechanism 163. The positioning mechanism 163 is a mechanism that positions the tray mounting member 143 at each of the mounting position E1, the stand position E2, and the storage position E3.
As shown in FIGS. 18 and 19, the positioning mechanism 163 includes a fixed plate 164, a locking plate 165, and a biasing member 166 (referred to as a third biasing member). The positioning mechanism 163 is provided on the right side of the second portion 150B.

  The fixed plate 164 is formed of a plate material whose plate surface faces the machine body width direction, and the front portion is fixed to the connecting member 133. The fixing plate 164 has a first locking groove 167A, a second locking groove 167B, and a third locking groove 167C. The first locking groove 167A is formed in the upper and lower middle part of the rear portion of the fixed plate 164, and is formed in an open shape toward the rear. The second locking groove 167B is formed in the lower part of the fixed plate 164 and is formed in an open shape downward. The third locking groove 167C is formed in the upper part of the rear portion of the fixed plate 164, and is formed in an open shape toward the upper rear side.

  The locking plate 165 is fixed to the right side of the second portion 150B. The locking plate 165 and the second portion 150B are connected by a reinforcing member 168. The locking plate 165 can be opposed to the first locking groove 167A, the second locking groove 167B, and the third locking groove 167C by rotating the main body 146 around the connecting member 133. When the locking plate 165 is fitted into the first locking groove 167A, the tray mounting member 143 can be fixed at the mounting position E1. Further, when the locking plate 165 is fitted into the second locking groove 167B, the tray placing member 143 can be fixed to the stand position E2. Further, when the locking plate 165 is fitted into the third locking groove 167C, the tray mounting member 143 can be fixed at the storage position E3.

  As shown in FIG. 14, the tray mounting member 143 is projected backward from the connecting member 133 at the mounting position E1. Further, the tray placing member 143 is projected downward from the connecting member 133 at the stand position E2. In addition, the tray mounting member 143 protrudes upward and obliquely upward from the connecting member 133 at the storage position E3. The tray mounting member 143 is positioned above the mounting position E1 at the storage position E3.

  The third urging member 166 is composed of a tension coil spring. One end of the third urging member 166 is hooked to the locking plate 165. The other end of the third urging member 166 is hooked on a hook piece 169 fixed to the connecting member 133. The third urging member 166 urges the locking plate 165 in a direction in which the locking plate 165 fits in the first locking groove 167A, the second locking groove 167B, and the third locking groove 167C. By moving the second portion 150B outward in the radial direction of the connecting member 133, the locking plate 165 is moved to the first locking groove 167A and the second locking groove against the biasing force of the third biasing member 166. It can be detached from 167B and the third locking groove 167C.

As shown in FIGS. 14 to 16, the transplanter 1 has a pressing mechanism 171. The pressing mechanism 171 is a mechanism for pressing the tray T1 placed on the tray placing member 143. The holding mechanism 171 is disposed below the seedling table 46 (between the seedling table 46 and the tray mounting member 143). Further, the pressing mechanism 171 is provided between the first frame material 131A and the second frame material 131B.

As shown in FIGS. 17 and 19, the pressing mechanism 171 includes a support bracket 172, a tray pressing 173, an urging member 174 (referred to as a fourth urging member), and a contact 175.
The support bracket 172 is made of a plate material and is fixed to the upper connection frame 140. The support bracket 172 includes a pivot portion 176A, a restriction portion 176B, and a first retaining wall portion 176C.

  The tray retainer 173 is formed of a bar material and is formed in an L shape from the arm portion 177A and the presser portion 177B. One end of the arm portion 177A is pivotally supported by the pivot portion 176A so as to be swingable up and down around an axis in the body width direction. As shown in FIG. 14, the arm holder 177A swings up and down, whereby the tray holder 173 can be changed between a holding posture G1 and a retracting posture G2. The arm portion 177A comes into contact with the restriction portion 176B in the retracted posture G2, and the upward swing is restricted. The presser portion 177B extends in the body width direction from the other end of the arm portion 177A. Further, the presser portion 177B comes into contact with the tray T1 on the tray placing member 143 in the pressing posture G1.

  The fourth urging member 174 is configured by a tension coil spring. One end of the fourth biasing member 174 is hooked to the first hooking wall portion 176C, and the other end of the fourth biasing member 174 is hooked to the second hooking wall portion 178 fixed to the arm portion 177A. It is hanging. The fourth biasing member 174 biases the tray presser 173 downward (in the direction pressed against the tray T1) in the presser posture G1. The fourth biasing member 174 biases the tray presser 173 upward in the retracted posture G2.

The contact 175 is in contact with the support bracket 172, thereby restricting the downward swing of the tray presser 173.
In the present embodiment, there is a seedling platform 46 provided at the rear of the machine body 9 and on the front side of the steering handle 7, and the tray mounting member 143 for mounting the empty tray T <b> 1 is placed below the steering handle 7. Provided. Thereby, simplification of the operation | work which mounts empty tray T1 on the tray mounting member 143 can be achieved. Further, by making it possible to change the position of the tray mounting member 143 between the mounting position and the stand position, the tray mounting member 143 can also be used as a stand. Cost reduction can be achieved by sharing this member.

In addition, by providing the tray locking member 149, the empty tray T1 placed on the tray placing member 143 can be positioned.
Further, by providing a tray holder 173 for holding down the empty tray T1 placed on the tray placing member 143 below the seedling placing table 46, the empty tray T1 on the tray placing member 143 can be stably held. it can.

Further, by providing a positioning mechanism 163 for positioning the tray mounting member 143 at the mounting position E1, the stand position E2, and the storage position E3, the tray mounting member 143 can be used when the tray mounting member 143 is not used. 143 can be arranged in the storage position E3 that does not get in the way.
As shown in FIGS. 21, 22, and 23, the first operation lever 136 is disposed on the right side and in the vicinity of the first flange portion 134 </ b> A of the steering handle 7. The first operation lever 136 is supported by the first flange 134A. The first operation lever 136 is an operation lever that combines an operation member of a main clutch that cuts power to the traveling device 10 and an operation member of a brake that brakes the traveling device 10. That is, the first operating lever 136 cuts off the power to the crawler traveling bodies 18L and 18R of the left traveling mechanism 6L and the right traveling mechanism 6R and brakes the crawler traveling bodies 18L and 18R.

A base portion (lower end side) of the first operation lever 136 is attached to a mounting bracket 186 (referred to as a first mounting bracket) via a lever shaft 187 (referred to as a first lever shaft). The first operating lever 136 can swing around the axis of the first lever shaft 187 and can swing in the body width direction. An attachment cylinder 188 (referred to as a first attachment cylinder) is fixed to the lower end of the first attachment bracket 186. The first mounting cylinder 188 is externally fitted to a swing support shaft 189 (referred to as a first swing support shaft) having an axis in the body width direction so as to be rotatable around the shaft center. The first swing support shaft 189 is
It is attached to a left attachment member 190 that is fixed to the first flange 134A. Therefore, the first operation lever 136 can swing in the front-rear direction.

  A base portion of the brake arm 191 is fixed to the front portion of the first mounting cylinder 188. As shown in FIG. 24, a brake wire 192 is connected to the tip of the brake arm 191. The brake wire 192 is composed of a Bowden wire, and has an inner wire 192a and an outer wire 192b. One end of the inner wire 192 a of the brake wire 192 is connected to the tip of the brake arm 191 via a connecting member 193. As shown in FIG. 24, the other end of the inner wire 192a of the brake wire 192 is connected to a brake lever 195 that operates the brake 194 via a spring.

  A base portion of the pressing member 196 is fixed to the first mounting cylinder 188. The pressing member 196 protrudes upward from the first mounting cylinder 188. The pressing member 196 includes a pressing part 197 and a release part 198. The pressing portion 197 is provided on the rear surface side of the pressing member 196 and is formed in a concave surface that is recessed in a curved shape. The pressing portion 197 is a portion that presses the swing link 203. The release portion 198 is provided on the upper surface side of the pressing member 196, and is formed in an arc shape centering on the axis O1 of the first swing support shaft 189 (the swing center of the first operation lever 136). The release unit 198 is a part that releases the pressure on the swing link 203.

  The release unit 198 has a holding part 199. A predetermined range on the rear side of the release part 198 is a holding part 199. In addition, the holding portion 199 has a recess 200. A corner portion 201 between the pressing portion 197 and the release portion 198 is formed in a convex arc surface. An engagement pin 202 is provided on the rear side of the upper portion of the pressing member 196. The engagement pin 202 has an axial center in the body width direction, and protrudes to the right.

  A swing link 203 is disposed on the rear side of the pressing member 196. One end side of the swing link 203 is supported on the left mounting member 190 by a first link pin 204 so as to be rotatable about an axis in the body width direction. The first link pin 204 is located on the rear upper side of the first swing support shaft 189. An engaging member 205 is provided on the other end side of the swing link 203. The engaging member 205 is formed in a cylindrical shape having an axis in the body width direction. The engaging member 205 is fixed to the side surface of the swing link 203. Further, the engaging member 205 can contact the pressing portion 197 and the releasing portion 198 of the pressing member 196. The engaging member 205 may be integrally formed with the swing link 203 as a single member.

A second link pin 206 is provided on the other end side of the swing link 203. The second link pin 206 is provided concentrically with the engaging member 205. One end side (rear end side) of the clutch link 207 is pivotally supported by the second link pin 206.
As shown in FIG. 23, the clutch wire 208 is connected to the other end side (front end side) of the clutch link 207. The clutch wire 208 is composed of a Bowden wire, and has an inner wire 208a and an outer wire 208b. One end side of the inner wire 208 a of the clutch wire 208 is connected to the other end side of the clutch link 207 via a connecting member 209. The other end of the inner wire 208a of the clutch wire 208 is connected to a clutch lever 211 that engages and disengages the main clutch 210 (connects and disconnects the main clutch 210). The clutch lever 211 is provided with a release fork 212 for operating the main clutch 210.

As shown in FIGS. 20, 21, and 22, an auxiliary operation member 213 is provided on the right side of the first collar 134A. The auxiliary operation member 213 includes an arm part 214 and an operation part 215. A base portion 214 a of the arm portion 214 is pivotally supported by a fixing bracket 216 fixed to the left mounting member 190 via a pivot pin 217. The pivot pin 217 has an axis in the body width direction. The pivot pin 217 is located below the first link pin 204. The distal end side 214b of the arm portion 214 extends from the base portion 214a to the front side of the first swing support shaft 189. The distal end side 214b of the arm portion 214 has an engagement groove 218 through which the engagement pin 202 is inserted. The engagement groove 218 has a first groove portion 218a on the front side and a second groove portion 218b on the rear side. The first groove portion 218a is formed in an arc shape that is inclined downward from the front end of the second groove portion 218b and convex forward. The second groove portion 218b is formed in an arc shape that is inclined downward from the upper end of the first groove portion 218a and protrudes upward. The operation part 215 extends rearward and upward from the base part 214 a of the arm part 214. The operation unit 215 can be operated with a thumb or the like while holding the steering handle 7. In other words, the auxiliary operation member 213 can be operated while holding the steering handle 7.

  As shown in FIG. 25, a lever groove 219 (referred to as a first lever groove) for guiding the first operation lever 136 is formed on the left side of the operation panel 135. The first operation lever 136 is inserted into the first lever groove 219. The first operation lever 136 is movable in the first lever groove 219. The first operation lever 136 can be operated to a clutch engagement position H1, a clutch disengagement position H2, a brake disengagement position H3, a brake engagement position H4, and a locking position H5.

  When the first operating lever 136 is operated to the clutch engagement position H1, the main clutch 210 is connected, and power to the left and right crawler traveling bodies 18L and 18R is transmitted. At the clutch engagement position H1, the brake 194 is in a released state (a state where the crawler traveling bodies 18L and 18R are not braked). When the first operating lever 136 is swung rearward from the clutch engagement position H1 and operated to the clutch disengagement position H2, the main clutch 210 is disengaged, and transmission of power to the crawler traveling bodies 18L and 18R is interrupted. At the clutch disengagement position H2, the brake 194 is still in a released state. The first operating lever 136 cannot be swung back from the clutch disengagement position H2. When the first operation lever 136 is operated from the clutch disengagement position H2 to the brake disengagement position H3, the clutch is engaged and the brake is released, and the first operation lever 136 is allowed to swing backward. When the first operating lever 136 is operated from the brake disengagement position H3 to the brake engagement position H4, the brake 194 is operated while the clutch disengagement state is maintained, and the crawler traveling bodies 18L and 18R are braked. When the first operation lever 136 is operated from the brake applied position H4 to the locking position H5, the first operation lever 136 can be held with the clutch disengaged and the brake applied.

  FIG. 26 shows a side view of the state in which the first operating lever 136 is operated to the clutch engagement position H1. In the clutch engagement position H1, the engagement member 205 is in contact with the pressing portion 197, and the engagement member 205 is located on the front side and above the first link pin 204. In this clutch engagement position H1, the backward swing of the first operation lever 136 is restricted by the biasing force F1 of the return spring of the main clutch 210. That is, the first operation lever 136 is held at the clutch engagement position H1. The engagement pin 202 is located at the lower end of the first groove 218a.

  As shown in FIG. 27, when the first operating lever 136 is swung rearward from the clutch engagement position H1 and operated to an intermediate position between the clutch engagement position H1 and the clutch disengagement position H2, the pressing member 196 swings rearward. Move. When the pressing member 196 swings backward, the engaging member 205 is pressed by the pressing portion 197. The engaging member 205 pressed by the pressing portion 197 moves upward while being in contact with the pressing portion 197. As a result, the swing link 203 swings rearward and upward. When the swing link 203 swings rearward and upward, the clutch link 207 is pulled rearward against the urging force F 1, and the clutch lever 211 is pulled via the clutch wire 208. Then, the main clutch 210 is operated by the release fork 212 in the direction of cutting the power. The engagement pin 202 moves upward in the first groove 218a.

As shown in FIG. 21, when the first operating lever 136 is further swung back and operated to the clutch disengagement position H2, the pressing member 196 is swung further back to press the engaging member 205. Then, the engaging member 205 climbs over the corner portion 201 from the upper end of the pressing portion 197 and rides on the holding portion 199 of the releasing portion 198. When the engaging member 205 rides on the holding portion 199, the downward swing of the swing link 203 is restricted, and the urging force F1 causes the pressing member 196 to swing forward (the first operating lever 136 is engaged with the clutch). Does not work in the direction of swinging to position H1). At this time, since the brake 194 is not operated, the urging force of the return spring of the brake 194 does not act on the first operation lever 136. Accordingly, at the clutch disengagement position H2, the pressing member 196 does not swing unless the first operation lever 136 is operated. In other words, at the clutch disengagement position H2, the first operation lever 136 is held so that it cannot swing. Further, when the first operation lever 136 is operated to the clutch disengagement position H2, the engaging member 205 is fitted into the recess 200. Further, at the clutch disengagement position H2, the engagement pin 202 is located at the upper end of the first groove 218a.

  When the operation portion 215 of the auxiliary operation member 213 is pushed down with the thumb or the like at the clutch disengagement position H2, the tip end side of the arm portion 214 swings upward around the pivot pin 217. When the arm part 214 swings upward, the engagement pin 202 is pressed by the lower edge 220 of the upper part of the first groove part 218a. Then, the engaging pin 202 moves downward in the first groove portion 218a, and thereby the pressing member 196 swings forward. When the pressing member 196 swings forward, the engaging member 205 is disengaged from the release portion 198 (holding portion 199), and then moves to the upper end of the pressing portion 197 via the corner portion 201. When the engaging member 205 moves to the pressing portion 197, the engaging member 205 presses the pressing member 196 forward by the urging force F1. Accordingly, the first operation lever 136 is operated to the clutch engagement position H1. A lower edge portion of the upper portion of the first groove portion 218 a is a pressing portion 220 that presses the engagement pin 202.

  As shown in FIG. 28, when the first operation lever 136 is operated from the clutch disengagement position H2 to the brake disengagement position H3 and further to the brake engagement position H4, the brake arm 191 swings rearward and upward. Then, the brake lever 195 is pulled by the brake wire 192 and the brake 194 is operated. At this time, the urging force F2 of the return spring of the brake 194 acts on the brake arm 191. This urging force F2 acts in a direction to return the first operation lever 136 to the brake cut position H3. Further, when the first operating lever 136 is operated to the brake applied position H4, the engaging member 205 moves forward on the release portion 198. When the engagement member 205 is positioned on the release portion 198, the urging force F1 does not work in the direction in which the first operation lever 136 is swung. That is, the swing link 203 is in a state where the pressing force of the pressing member 196 does not act. Further, in the brake engagement position H4, the engagement pin 202 is located at the rear end of the second groove portion 218b.

  In the present embodiment, after the main clutch 210 is disengaged, the engaging member 205 rides on the release portion 198, so that the pressing force of the pressing member 196 does not act on the swing link 203. Thereby, after the main clutch 210 is disengaged, the urging force F1 does not act on the first operation lever 136, and the operation force of the first operation lever 136 when operating the brake 194 can be reduced.

  In the present embodiment, the release portion 198 has an arc shape centered on the swing center O1 of the first operating lever 136, and the engaging member 205 that is pressed by the pressing member 196 after the main clutch 210 is disconnected. Get on the release unit 198. Accordingly, when the operation of operating the brake 194 is performed, the position of the engagement member 205 moves on the release portion 198, so that the operation of the first operation lever 136 can be performed smoothly.

Further, the release portion 198 has a holding portion 199 that holds the first operation lever 136 at a position where the main clutch 210 is disconnected and the brake 194 is released, so that the main clutch 210 is disconnected and the brake 194 is released. In this state, the first operation lever 136 can be held.
Further, by forming the concave portion 200 in which the engaging member 205 is fitted in the holding portion 199 of the release portion 198, there is a response when the first operating lever 136 is set to the clutch disengagement position H2, and the holding position of the first operating lever 136 is reached. Can be easily recognized by the operator.

  Further, an auxiliary operation member 213 that can be operated while holding the steering handle 7 is provided, and the auxiliary operation member 213 causes the main clutch 210 to be connected in a state where the engagement member 205 is positioned at the holding portion 199. By enabling the swing, the main clutch 210 can be connected without releasing the steering handle 7 from the state where the main clutch 210 is disconnected and the brake 194 is released.

In the transplanter 1, when the seedling 2 is planted up to the end of the ridge R1, the seedling 2 is planted on the adjacent ridge R1 by turning around the headland in the field and making the traveling direction reverse. In the walking type transplanter 1, when turning on a headland or the like, the body 9 is raised, and then the steering handle 7 is pushed down to make the front wheel 14 float from the ground and turn. When the headland is narrow, the main clutch 210 is disengaged when the machine body 9 is raised. Then, when the fuselage 9 is raised, the steering handle 7 is pushed down to float the front wheel 14 from the ground, and then the main clutch 210 is connected. At this time, if the first operating lever 136 is operated with the left hand, the steering handle 7 must be gripped only with the right hand. However, in this embodiment, the auxiliary operation member 213 can operate the first operation lever 136 from the clutch disengagement position H2 to the clutch engagement position H1 without releasing the hand from the steering handle 7. Thereby, the steering handle 7 can be stably held with both hands.

In addition, the engaging pin 202 is provided on the pressing member 196, and the auxiliary operation member 213 is provided with a pressing portion 220 that presses the engaging pin 202 to swing the pressing member 196 in the direction in which the main clutch 210 is connected. The structure can be simplified.
As shown in FIGS. 29, 30, and 31, the second operation lever 137 is disposed on the left side and in the vicinity of the second collar portion 134 </ b> B of the steering handle 7. The second operation lever 137 is supported by the second flange 134B. The second operating lever 137 is an operating lever that operates the elevating valve 61 to raise and lower the machine body 9 and also interrupts transmission of power to the transplant device 4.

  A base portion (lower end side) of the second operation lever 137 is attached to a mounting bracket 226 (referred to as a second mounting bracket) via a lever shaft 227 (referred to as a second lever shaft). The second operation lever 137 can swing around the axis of the second lever shaft 227 and can swing in the body width direction. An attachment cylinder 228 (referred to as a second attachment cylinder) is fixed to the lower end of the second attachment bracket 226. The second mounting cylinder 228 is externally fitted to a swing support shaft 229 (referred to as a second swing support shaft) having an axis in the body width direction so as to be rotatable about the axis. The second swing support shaft 229 is attached to the right attachment member 230 fixed to the second flange 134B. Therefore, the second operation lever 137 can swing in the front-rear direction.

  As shown in FIG. 32, the swing of the second operation lever 137 is transmitted to the lift valve 61 by the link mechanism 231 and the lift wire 232. The link mechanism 231 is provided between the second operation lever 137 and the lifting wire 232. The link mechanism 231 includes a first lifting link 233 and a second lifting link 234. The base of the first lifting link 233 is fixed to the upper part of the second mounting cylinder 228. One end side (rear end side) of the second elevating link 234 is pivotally supported at the front end of the first elevating link 233 via the first connecting pin 236. A connecting member 238 is pivotally supported on the other end side (front end side) of the second elevating link 234 via a second connecting pin 237.

  The elevating wire 232 is composed of a Bowden wire, and has an inner wire 232a and an outer wire 232b. One end of the inner wire 232 a of the elevating wire 232 is attached to the connecting member 238. The other end of the inner wire 232a is linked to the lift valve 61. A biasing force in the direction of arrow F3 is applied to the inner wire 232a from the lift valve 61 side.

  As shown in FIG. 33, a lever groove 239 (referred to as a second lever groove) for guiding the second operation lever 137 is formed on the right side of the operation panel 135. A second operation lever 137 is inserted into the second lever groove 239. The second operation lever 137 can move in the second lever groove 239. The second operation lever 137 can be operated to a planting position M1, a fixed position M2, a lowered position M3, and a plurality of raised positions M4 and M5. The plurality of raised positions M4 and M5 include a first raised position M4 and a second raised position M5.

When the second operating lever 137 is operated to the planting position M1, a planting clutch that transmits power to the transplant device 4 is connected, and the seedling extraction device 47, the seedling mount 46, and the planting device 45 are driven. If the 2nd operation lever 137 remove | deviates from the planting position M1, a planting clutch will be cut | disconnected. Further, in the state where the second operation lever 137 is operated to the planting position M1, the lift valve 61 moves in accordance with the movement of the leveling roller 50 or the pressure reducing wheel 49 following the upper surface of the kite R1, the raised position, the neutral position, Switch to the lowered position. When the elevating valve 61 is switched to the raised position, the elevating cylinder 36 is extended and the machine body 9 is raised. When the lift valve 61 is switched to the neutral position, the lift cylinder 36 does not expand and contract and the vertical movement of the machine body 9 stops. When the elevating valve 61 is switched to the raised position, the elevating cylinder 36 contracts and the machine body 9 is lowered. When the second operation lever 137 is operated to the fixed position M2, the elevating valve 61 is fixed to the neutral position, and the elevating cylinder 36 cannot be expanded or contracted.

When the second operation lever 137 is operated to the lowered position M3, the body 9 is lowered. Then, the machine body 9 is lowered until the leveling roller 50 or the pressure reducing wheel 49 comes into contact with the upper surface of the kite R1 and the lift valve 61 is returned to the neutral position. When the second operating lever 137 is operated to the first raised position M4 or the second raised position M5, the elevating cylinder 36 is extended and the machine body 9 is raised.
In the planting position M1, the fixed position M2, the lowered position M3, and the first raised position M4, the connecting line Y1 connecting the first connecting pin 236 and the second connecting pin 237 is positioned above the second lever shaft 227. (See FIG. 30). Thus, the urging force F3 urges the second operating lever 137 in the direction of swinging forward at each of the planting position M1, the fixed position M2, the lowered position M3, and the first raised position M4. . In addition, at each of the planting position M1, the fixed position M2, the lowered position M3, and the first raised position M4, the second operating lever 137 contacts the edge of the second lever groove 239 to be held at each position. Is done.

  As shown in FIG. 36, in a state where the second operation lever 137 is operated to the second raised position M5, the connecting line Y1 is positioned below the second lever shaft 227. That is, in a state where the second operation lever 137 is operated to the second raised position M5, the urging force F3 urges the second operation lever 137 in the direction of swinging backward. Accordingly, the second operation lever 137 contacts the edge of the second lever groove 239 and is held at the second raised position M5. As described above, the urging force F3 is switched by the link mechanism 231.

In the walking type transplanter 1, when turning, the second operating lever 137 is operated to the second raised position M5 to raise the machine body 9 to the highest position. At that time, in the state where the machine body 9 is raised to the highest position, if the user forgets to return the second operation lever 137 to the fixed position M2, the relief valve of the hydraulic circuit that controls the lift cylinder 36 remains open.
Therefore, in the present embodiment, a return mechanism 241 that is engaged with the elevating cylinder 36 when the machine body 9 is raised to a predetermined position (for example, the highest position or the vicinity of the highest position) is provided. When the machine body 9 is raised, the return mechanism 241 engages the lift cylinder 36 when the machine body 9 is raised to a predetermined position, thereby engaging the second operating lever 137 in the second raised position. The position is automatically changed from M5 to the fixed position M2.

As shown in FIGS. 29, 30, 31, 34, and 35, the return mechanism 241 includes an operating member 242, a return spring 243, and a return wire 244.
The actuating member 242 is provided in the vicinity of the elevating cylinder 36 and on the right outer surface of the rear portion of the gantry 13. A fixing plate 245 is attached to the right outer surface of the rear portion of the gantry 13 with bolts. A pivot 246 having an axial center in the body width direction is provided at the upper front portion of the fixed plate 245. A cylindrical boss 247 is fixed to the operating member 242. The cylindrical boss 247 is externally fitted to the pivot 246 so as to be rotatable about the axis. Thereby, the operation member 242 can swing back and forth around the pivot 246.

  The operating member 242 is formed of a plate material. The actuating member 242 includes a contact portion 248, a rotation stop portion 249, a spring hanging wall 250, and a connecting wall 251. The contact portion 248 is located above the cylindrical boss 247. The rotation stopper 249 extends rearward from the lower side of the cylindrical boss 247. The spring hanging wall 250 extends outward from the lower side of the cylindrical boss 247 in the body width direction. The connecting wall 251 extends downward from the outer end of the spring hanging wall 250.

A locking wall 252 is provided at the rear portion of the fixed plate 245 so as to extend outward in the body width direction.
The return spring 243 is constituted by a tension coil spring. One end of the return spring 243 is hooked on the spring hanging wall 250. The other end of the return spring 243 is hooked on the locking wall 252. The return spring 243 biases the operating member 242 in a direction that causes the contact portion 248 to swing forward. Further, the rotation stop portion 249 contacts the locking wall 252 from the front side, whereby the rotation of the operating member 242 by the return spring 243 is restricted.

As shown in FIG. 34, the abutting portion 248 is a portion where the movable member 253 that moves as the elevating cylinder 36 extends and contracts. As shown in FIGS. 34 and 35, the piston rod 36 b of the elevating cylinder 36 is connected to the second shaft support 30. On the right side of the second shaft support 30 is provided a guide 254 supported on the gantry 13 so as to be movable in the front-rear direction. A movable member 253 is fixed to the guide 254. Therefore, the movable member 253 moves with the movement of the piston rod 36b. Then, when the piston rod 36b moves rearward (moves in a direction protruding from the cylinder tube 36a) and the machine body 9 rises to a predetermined position, the movable member 253 presses the contact portion 248 (the operating member 242). .

  As shown in FIG. 34, the operating member 242 can be changed in position to a standby position that is a position indicated by a solid line and an operating position that is a position indicated by an imaginary line. The standby position is a position where the rotation stop portion 249 contacts the locking wall 252 and the rotation by the return spring 243 is restricted. The standby position is a state before the movable member 253 presses the operating member 242. The operating position is a state in which the operating member 242 swings so that the upper part swings backward by the movable member 253 pressing the contact portion 248. When the movable member 253 moves away from the contact portion 248, the operating member 242 returns to the standby position by the return spring 243.

  As shown in FIGS. 29 and 30, the return wire 244 is a wire that links the second operating lever 137 and the operating member 242. The return wire 244 is configured by a Bowden wire. The return wire 244 includes an inner wire 244a and an outer wire 244b. One end of the inner wire 244 a of the return wire 244 is attached to the connecting member 255. The connecting member 255 is connected to the connecting portion 251 via a pin 259 so as to be rotatable about an axis in the body width direction. One end of the outer wire 244 b of the return wire 244 is attached to the locking wall 252. The other end of the inner wire 244 a of the return wire 244 is connected to the second operation lever 137 via a spring member 256. The other end of the outer wire 244b of the return wire 244 is attached to the second frame member 131B.

  As shown in FIGS. 30 and 31, a spring hook member 257 is attached to the other end of the inner wire 244 a of the return wire 244. The base of the swing piece 258 is fixed to the second mounting cylinder 228 and the second mounting bracket 226. The spring member 256 is composed of a tension coil spring. One end of the spring member 256 is hooked on the spring hook member 257. The other end of the spring member 256 is hooked on the tip side of the swing piece 258.

  29 and 30 show a state in which the second operation lever 137 is located at the fixed position M2. The second operation lever 137 is held at the fixed position M2 by the urging force F3. Further, the movable member 253 is separated from the operating member 242 forward, and the operating member 242 is in the standby position. When the second operating lever 137 is operated to the second raised position M5 from this state, the urging direction of the urging force F3 is switched and the second operating lever 137 is held at the second raised position M5 by the urging force F3. Further, by moving the second operation lever 137 to the second raised position M5, the lift valve 61 is operated, the piston rod 36b of the lift cylinder 36 moves rearward, and the machine body 9 is raised. At this time, the movable member 253 also moves backward with the movement of the piston rod 36b. When the body 9 reaches a predetermined position (in this embodiment, when the piston rod 36b is full stroke and the body 9 reaches the highest position), the movable member 253 presses the contact portion 248 of the operating member 242. Then, the operating member 242 pulls the inner wire 244a of the return wire 244. Accordingly, the inner wire 244a pulls the swing piece 258 via the spring member 256. The spring force of the spring member 256 at this time is larger than the biasing force F3, and the swing piece 258 swings forward about the second lever shaft 227. Thereby, the 2nd operation lever 137 and the 1st raising / lowering link 233 rock | fluctuate ahead. When the first lifting link 233 swings forward, the urging force F3 is switched so as to swing the second operation lever 137 forward. Then, the second operating lever 137 automatically returns to the fixed position M2 by the urging force F3. When the second operation lever 137 returns to the fixed position M2, the lift valve 61 is returned to neutral, and the extension of the lift cylinder 36 is stopped.

In the present embodiment, the inner wire 244a of the return wire 244 is configured to bend between the other end of the outer wire 244b and the swing piece 258 when the second operation lever 137 is located at the fixed position M2. Yes. Further, the inner wire 244a of the return wire 244 is stretched when the second operation lever 137 is moved to the second raised position M5. Further, the biasing force of the spring member 256 is configured not to act on the second operation lever 137 when the second operation lever 137 is set to the second raised position M5. Even if the spring force of the spring member 256 acts on the swing piece 258 when the second operation lever 137 is set to the second raised position M5, the spring force of the spring member 256 at this time is more than the biasing force F3. There is no problem if the spring force of the spring member 256 becomes larger than the biasing force F3 when the return wire 244 is small and the return wire 244 is pulled by the operating member 242.

  According to the present embodiment, when the body 9 is raised to a predetermined position when the second operation lever 137 is positioned at the second raised position M5, the second operation lever 137 is engaged with the elevating cylinder 36. A return mechanism 241 for changing the position to the fixed position M2 is provided. Thereby, when the body 9 is raised to a predetermined position, the position of the second operation lever 137 can be automatically changed from the second raised position M5 to the fixed position M2.

  The return mechanism 241 includes an operating member 242 that is pressed by the movable member 253 that moves with expansion and contraction of the elevating cylinder 36 when the machine body 9 is positioned at a predetermined position, and a moving member 253 that presses the operating member 242. In order to change the position of the second operating lever 137 from the second raised position M5 to the fixed position M2, the second operating lever 137 and a return wire 244 that links the operating member 242 are provided. Thereby, the return mechanism 241 can be realized with a simple structure.

Further, by providing the return spring 243 that returns the operating member 242 to the standby position, the trouble of returning the operating member 242 to the standby position can be saved.
The link mechanism 231 is provided between the second operating lever 137 and the lifting wire 232 that transmits the operating force of the second operating lever 137 to the lifting valve 61. The second operating lever 137 is moved to the fixed position M2. The second operating lever 137 is held at the fixed position M2 by the urging force acting on the lifting wire 232 when positioned, and the second operating lever 137 by the urging force when the second operating lever 137 is positioned at the second raised position M5. Is provided with a return mechanism 241 in the transplanter 1 provided with a link mechanism 231 for switching the urging force so as to be held at the second raised position M5. Thereby, the return mechanism 241 can be configured with a simple structure.

37 to 40 show other examples of the seedling removal device.
Regarding the seedling extraction device 47 of another example, the same members as those of the seedling extraction device 47 described above are denoted by the same reference numerals, description thereof is omitted, and different points will be described.
In the seedling removal device 47 of this other example, the first engagement portion 261A and the second engagement portion 261B are configured by rollers (bearing rollers). The pressing member 262 is formed by a leaf spring.

  The first engagement portion 261A is provided at an intermediate portion between one end portion and the other end portion of the first claw attachment portion 74A. Specifically, the first engaging portion 261A is provided between the base portion 96A of the first seedling catching claw 51A and the first biasing member 83. The first engagement portion 261A is provided on the side opposite to the attachment side of the first seedling catching claw 51A. The first engagement portion 261A is attached to the first claw attachment portion 74A by a first roller shaft 263A so as to be rotatable about the axis.

  The second engagement portion 261B is provided at an intermediate portion between the one end portion and the other end portion of the second claw attachment portion 74B. Specifically, the second engagement portion 261B is provided between the base portion 96B of the second seedling catching claw 51B and the first biasing member 83. Moreover, the 2nd engaging part 261B is provided in the opposite side to the attachment side of the 2nd seedling nail | claw 51B. The second engagement portion 261B is attached to the second claw attachment portion 74B so as to be rotatable about the axis by the second roller shaft 263A.

The first roller 263A shaft has an axis in the thickness direction of the first claw mounting portion 74A. The second roller shaft 263A has an axis in the thickness direction of the second claw mounting portion 74B. The axial centers of the first roller 263A shaft and the second roller shaft 263A are parallel.
The pressing member 262 is provided between the first claw mounting portion 74A and the second claw mounting portion 74B. The pressing member 262 includes a first elastic piece 266A, a second elastic piece 266B, a first fixed piece 267A, a second fixed piece 267B, a first connection portion 269A, a second connection portion 269B, and a third connection. A portion 270, a first attachment piece 268A, and a second attachment piece 268B are included.

The first fixed piece 267 </ b> A is located on the left side surface of the swing member 111. Second fixed piece 267B
Is located on the right side surface of the swing member 111. A first mounting piece 268A extends from the first fixed piece 267A. A second mounting piece 268B extends from the second fixed piece 267B. The first attachment piece 268A and the second attachment piece 268B are attached to the swing member 111 by a plurality of screws 271a and 271b and nut members 273a and 273b screwed to the screws 271a and 271b. Therefore, the pressing member 262 swings integrally with the swing member 111.

  The plurality of screws 271 a and 271 b are arranged side by side in the swing direction of the swing member 111. Screw insertion holes 272a and 272b through which the screws 271a and 271b are inserted, and the screw insertion holes 272a and 272b formed in the swinging member 111 are formed as long holes that are long in the swinging direction. Accordingly, the position of the first mounting piece 268A and the second mounting piece 268B (pressing member) can be adjusted in the swinging direction of the swinging member 111.

  The first elastic piece 266A is disposed on the left side of the first fixed piece 267A. The first elastic piece 266A includes a first engagement pressing portion 264A and a first engagement release portion 265A. The first engagement pressing portion 264A is located closer to the tip end portion of the first seedling claw 51A than the first engagement release portion 265A. The second elastic piece 266B is disposed on the right side of the second fixed piece 267B. The second elastic piece 266B includes a second engagement pressing portion 264B and a second engagement release portion 265B. The second engagement pressing portion 264B is located closer to the tip of the second seedling catching claw than the second engagement release portion 265B.

  The first connection portion 269A is formed in an arc shape (curved shape), and connects the first engagement release portion 265A and the first fixed piece 267A. The first elastic piece 266A is cantilevered by the first fixed piece 267A via the first connection portion 269A. Thereby, the first elastic piece 266A can be elastically deformed. The second connection portion 269B is formed in an arc shape (curved shape), and connects the second engagement release portion 265B and the second fixed piece 267B. The second elastic piece 266B is cantilevered by the second fixed piece 267B via the second connection portion 269B. Thus, the second elastic piece 266B can be elastically deformed.

The third connection portion 270 connects the first fixed piece 267A and the second fixed piece 267B.
In the illustrated example, the pressing member 262 is configured by bending a single spring plate, but the pressing member 262 includes the first elastic piece 266A, the first fixed piece 267A, and the first mounting piece 268A. And a spring plate having a first elastic piece 266A, a first fixing piece 267A, and a first attachment piece 268A.

  As shown in FIGS. 37 and 39, in the seedling removal device 47 of this other example, immediately before the first seedling removal claw 51A and the second seedling removal claw 51B pierce the root pot 2a in the pot portion P1. In the state (the same state as shown in FIG. 10), the first engagement release portion 265A corresponds to (contacts) the first engagement portion 261A, and the second engagement release portion 265B corresponds to the second engagement portion 261B. Corresponding (joining). In this state, the tip interval D1 between the first seedling claw 51A and the second seedling claw 51B is in an open state.

  When the nail support 71 advances to the tray T1 from the state immediately before the root pot 2a is pierced, the root pot 2a is pierced at the tip side of the first seedling claw 51A and the second seedling claw 51B. At this time, the cam follower 113 is pressed by the action part 108b of the cam 108, and the swinging member 111 swings away from the tips of the first seedling catching claw 51A and the second seedling catching claw 51B. Then, the pressing cam 262 swings integrally with the swing member 111, the first engagement pressing portion 264A presses the first engagement portion 261A, and the second engagement pressing portion 264B presses the second engagement portion 261B. To do. Thereby, the first seedling claw 51A and the second seedling claw 51B rotate in a direction to reduce the tip interval D1, and the tips of the first seedling claw 51A and the second seedling claw 51B are closed (see FIG. 40).

Other configurations are the same as those of the seedling extraction device 47 described above.
By configuring the first engaging portion 263A and the second engaging portion 263B with rollers, the pressing member 262 smoothly contacts the first engaging portion 263A and the second engaging portion 263B. As a result, wear of the first engaging portion 263A, the second engaging portion 263B, and the pressing member 262 can be reduced.

As mentioned above, although this invention was demonstrated, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

9 Airframe 10 Traveling device 36 Elevating cylinder 61 Elevating valve 137 Operation lever (second operation lever)
231 Link mechanism 232 Lifting wire 241 Returning mechanism 242 Actuating member 243 Returning spring 244 Returning wire 253 Movable member M2 Fixed position M5 Raised position (second raised position)
F3 force

Claims (4)

The aircraft,
An elevating cylinder for elevating the airframe;
A movable member that moves with expansion and contraction of the elevating cylinder;
A lift valve for controlling the lift cylinder;
An operation lever for operating the lift valve, which is operable at a raised position for raising the aircraft and a fixed position for stopping raising and lowering of the aircraft, and capable of being held at the raised position and the fixed position;
A return mechanism that engages with the movable member to change the position of the operation lever to a fixed position when the airframe is raised to a predetermined position when the operation lever is in the raised position;
Transplanter equipped with.   The return mechanism includes an operation member that the movable member presses when the machine body is positioned at the predetermined position, and an operation lever that is moved from the raised position to the fixed position when the movable member presses the operation member. The transplanter according to claim 1, further comprising a return wire that interlocks the operation lever and the operating member to change the position. The position of the operating member can be changed between a standby position that is a position before the movable member presses and an operating position that is a position pressed by the movable member,
The transplanter according to claim 2, wherein the return mechanism includes a return spring that biases the operating member to return the operating member to the standby position. A lifting wire for transmitting the operating force of the operating lever to the lifting valve, and a lifting wire on which an urging force acts;
A link mechanism provided between the operation lever and the lifting wire, wherein the operation lever is held at the fixed position by the biasing force when the operation lever is located at the fixed position, and the operation lever is raised. The transplanter according to any one of claims 1 to 3, further comprising a link mechanism that switches the urging force so that the operating lever is held in the raised position by the urging force when positioned at a position.

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