JP2020099258A - Sulky rice transplanter - Google Patents

Abstract

To improve workability of seedling supply in a sulky rice transplanter in which reserve seedling trays are supported by front/rear support mechanisms so as to change positions in the longitudinal direction.SOLUTION: A sulky rice transplanter includes: support mechanisms 45 that support a plurality of reserve seedling trays 31 and 32 so as to be able to change positions between a first state where the reserve seedling trays are disposed at a prescribed interval apart in the vertical direction, and a second state where they are disposed in a row in the longitudinal direction; operation tools for artificially operating the reserve seedling trays 31 and 32 between the first state and the second state; and holding mechanisms capable of holding the reserve seedling trays 31 and 32 in the first state and the second state. The sulky rice transplanter further includes; front/rear support mechanisms 37 for supporting the reserve seedling trays 31 and 32 and the support mechanisms 45 so as to be able to change their positions in the longitudinal direction; front/rear operation tools for artificially changing the positions of the reserve seedling trays 31 and 32 and the support mechanisms 45 in the longitudinal direction; and front/rear holding mechanisms capable of holding the reserve seedling trays 31 and 32 and the support mechanisms 45 in desired positions in the longitudinal direction.SELECTED DRAWING: Figure 6

Description

The present invention relates to a configuration of a preliminary seedling stand for a riding type rice transplanter.

In the riding-type rice transplanter, as disclosed in Patent Document 1, a preliminary seedling stand provided on the machine body is supported by a front-rear support mechanism so that the position can be changed in the front-rear direction, and a worker holds a front-rear operation tool. There is one that can change the position of the preliminary seedling stand in the front-back direction.

When supplying seedlings from the ridges to the ridges, the ridge workers can easily move the seedlings from the ridges to the preliminary seedling stand by moving the aircraft closer to the ridges and moving the preliminary seedling stand to the front side. Can be replenished.

When supplying seedlings to the seedling stand of the rear planting device of the machine, the operator of the machine moves the spare seedling stand to the rear side and approaches the seedling stand so that the operator of the machine can put the seedlings in the stand. Can easily be supplied to the seedling stand of the seedling planting device.

JP, 2005-348634, A

In the riding-type rice transplanter, the work of supplying seedlings from the ridges to the preliminary seedling stand and the work of supplying seedlings from the preliminary seedling stand to the seedling stand of the seedling planting device are repeated. It is necessary to improve the workability of supply.

An object of the present invention is to improve workability of supplying seedlings in a riding type rice transplanter in which a preliminary seedling stand is supported by a front and rear support mechanism so as to be capable of changing its position in the front and rear direction.

The riding-type rice transplanter of the present invention has a first state in which a plurality of preliminary seedling stands are arranged at a predetermined interval in the vertical direction, and a plurality of the preliminary seedling stands are arranged in a row in the front-rear direction. A second state, a support mechanism for supporting the preliminary seedling stand so that the position of the preliminary seedling stand can be changed, an operation tool for artificially operating the preliminary seedling stand in the first state and the second state, and And a holding mechanism capable of holding the preliminary seedling stand in the first state and the second state, and allowing the operation of the preliminary seedling stand in the first state and the second state. A front and rear support mechanism that supports the preliminary seedling stand and the support mechanism so that the position can be changed in the front and rear direction, and a front and rear operation tool for artificially changing the positions of the preliminary seedling stand and the support mechanism in the front and rear direction, It is provided with a front and rear holding mechanism capable of holding the preliminary seedling stand and the support mechanism at a desired position in the front-rear direction, and permitting position change of the preliminary seedling stand and the support mechanism in the front-rear direction. There is.

According to the present invention, in a first state in which a plurality of preliminary seedling placing stands are arranged at a predetermined interval in the vertical direction, and in a second state in which a plurality of preliminary seedling placing stands are arranged in a row in the front-rear direction. , The spare seedling stand is supported by the support mechanism so that the position can be changed.
The operator can hold the preliminary seedling stand in the first state by the holding mechanism, and can hold the preliminary seedling stand in the second state by the holding mechanism. By operating the holding mechanism to the release state, the operator can operate the preliminary seedling placing table from the first state to the second state by holding the a operation tool, and from the second state to the first state. It can be operated.

According to the present invention, the operator can change the positions of the preliminary seedling stand and the support mechanism in the first state or the second state in the front-rear direction by operating the front-rear holding mechanism in the released state, By operating the front-rear holding mechanism in the holding state, the positions of the preliminary seedling stand and the support mechanism in the first state or the second state can be held at desired positions.

As described above, according to the present invention, when the work of supplying seedlings from the ridges to the preliminary seedling stand and the work of supplying the seedlings from the preliminary seedling stand to the seedling stand of the seedling planting apparatus, the worker is The preliminary seedling stand can be set to the first state or the second state according to various work situations, and the positions of the preliminary seedling stand and the support mechanism can be changed in the front-rear direction.
As a result, it is possible to set the state and position of the preliminary seedling stand that is suitable for seedling supply work, and the workability of seedling supply can be improved.

In the present invention, the preliminary seedling stand, the support mechanism, and the front-rear support mechanism are provided in the right and left portions of the front part of the aircraft having a driving seat, and in the first state and the second state, The handle part of the operation tool and the handle part of the front and rear operation tool are arranged on the rear side of the front and rear support mechanism and on the front side of the rear end part of the preliminary seedling stand in a side view. Is suitable.

In a riding type rice transplanter, a spare seedling stand is often provided on the right and left sides of the front part of the machine having a driver's seat. Often move to and get on and off.

According to the present invention, the handle part of the operation tool and the handle part of the front-back operation tool are arranged on the front side of the rear end part of the preliminary seedling stand in a side view, and from the rear end part of the preliminary seedling stand. Since it is not on the rear side (driver's seat side), it does not hinder the entry and exit of workers.

Since the handle part of the operation tool and the handle part of the front-rear operation tool are arranged on the rear side of the front-rear support mechanism in the side view and are not largely separated from the driver seat to the front side, the operator of the driver seat is The handle portion of the operation tool and the handle portion of the front-rear operation tool can be held without difficulty, and the operation tool and the front-rear operation tool can be operated without difficulty.

In the present invention, it is preferable that, in the first state, the handle portion of the operation tool is disposed above the handle portion of the front and rear operation tool in a side view.

It is considered that the operation from the first state to the second state and the operation from the second state to the first state of the spare seedling stand are performed more frequently than the operation of changing the position of the spare seedling stand in the front-rear direction. ..
According to the present invention, in the first state, the handle portion of the operation tool is arranged above the handle portion of the front and rear operation tool in a side view, so that the operator of the driver seat holds the handle section of the operation tool. This facilitates the operation of the preliminary seedling placing table from the first state to the second state.

In the present invention, it is preferable that, in the second state, the handle portion of the operation tool is disposed behind the handle portion of the front and rear operation tool in a side view.

It is considered that the operation from the first state to the second state and the operation from the second state to the first state of the spare seedling stand are performed more frequently than the operation of changing the position of the spare seedling stand in the front-rear direction. ..
According to the present invention, in the second state, since the handle portion of the operation tool is arranged on the rear side of the handle portion of the front and rear operation tool in a side view, the operator of the driver's seat holds the handle portion of the operation tool. It is easy to hold and it is easy to operate the preliminary seedling stand from the second state to the first state.

In the present invention, it is preferable that the handle portion of the operation tool is arranged along the front-rear direction, and the handle portion of the front operation tool is arranged along the up-down direction.

According to the present invention, the posture (front-back direction) of the handle portion of the operating tool is different from the posture (vertical direction) of the handle portion of the front-back operating tool, and the operator can move the handle portion of the operating tool forward and backward. Since it is easy to distinguish the handle portion of the operating tool, it is less likely that the operator will mistakenly hold the handle portion of the operating tool or mistakenly hold the handle portion of the front and rear operating tools.

The operation of the spare seedling stand from the first state to the second state and the operation from the second state to the first state are performed by moving the spare seedling stand to the upper side or the lower side. Move the stand up and down.
According to the present invention, since the handle part of the operation tool is arranged along the front-back direction, the posture of the handle part of the operation tool and the movement direction (vertical direction) of the preliminary seedling stand are crossed. Therefore, the operator can easily apply an operating force to the handle portion of the operation tool, and easily perform the operation of the preliminary seedling placing table from the first state to the second state and from the second state to the first state.

According to the present invention, the posture of the handle portion of the front-rear operation tool and the operation for changing the position of the preliminary seedling stand in the front-rear direction intersect each other, so that the operator applies an operation force to the handle portion of the front-rear operation tool. It is easy to hang, and it becomes easy to change the position of the preliminary seedling stand in the front-rear direction.

In the present invention, when the front-rear operation tool is rotatably supported about an axis along the front-rear direction and the handle portion of the front-rear operation tool is operated in a posture along the up-down direction, the front-rear holding mechanism is It is preferable that the front-rear holding mechanism is operated in a released state when the holding portion is operated and the handle portion of the front-rear operation tool is operated in a posture along the left-right direction.

In the riding-type rice transplanters with the spare seedling stand on the right and left sides of the front of the machine with the driver's seat, the operator moves left and right between the reserve seedling stand and the driver's seat to get on and off. In addition to this, an operator may move in the front-rear direction on the left and right center sides of the body of the preliminary seedling stand to get on and off.

The front-rear holding mechanism is operated in the released state because the front-rear holding mechanism is in the holding state more than the time when the front-rear holding mechanism is operated in the released state because the front-back holding mechanism is operated in the front-back direction. It has been operating for a long time. In a state where the front-rear holding mechanism is operated in the holding state, an operator often moves in the front-rear direction on the left and right center sides of the body of the preliminary seedling stand to get on and off.

According to the present invention, when the front-rear holding mechanism is configured to be operated by the front-rear operating tool, when the handle portion of the front-rear operating tool is operated in a posture along the up-down direction, the front-rear holding mechanism is operated. It is operated in the holding state.
As a result, when an operator moves in the front-rear direction on the left and right center side of the body of the preliminary seedling stand and gets on and off, the handle of the front-rear operation tool rarely enters the operator's boarding/alighting path, and It is unlikely that the handle will prevent the operator from getting on and off.

In the present invention, the holding mechanism can be maintained in a released state in a state where the preliminary seedling stand is operated in the first state and the second state, and the preliminary seedling stand is in the first state and It is preferable that the holding state is automatically set when the second state is operated.

According to the present invention, when the operator operates the holding mechanism to the release state when the operator performs the operation from the first state to the second state and the operation from the second state to the first state of the preliminary seedling stand, Since the holding mechanism can be maintained in the released state, the operator does not perform the operation of stopping the holding mechanism from returning to the holding state, and the operation of the preliminary seedling placing table from the first state to the second state and the second state. The operation from the second state to the first state can be performed without difficulty.

According to the present invention, when the operator operates the preliminary seedling placing table from the first state to the second state (when operating from the second state to the first state) while the holding mechanism is maintained in the released state, the released state is held. Since the mechanism is automatically put in the holding state, the operator does not need to operate the holding mechanism from the released state to the holding state, and the operability is good.

It is a left side view of a riding type rice transplanter. It is a top view of the front of a riding type rice transplanter. It is a front view of the front part of a riding type rice transplanter. It is a left side view near the left preliminary seedling stand in the first state. It is a left side view near the left preliminary seedling stand in the second state. It is a left side view showing the state where the left preliminary seedling stand in the first state has been repositioned to the central position, the front position, and the rear position. It is a disassembled perspective view near the left 1st support link and the 2nd support link. It is a vertical front view of the vicinity of the left support member. It is a left side view near the left support member. In 1st another form of implementation of invention, it is a left side view and rear view of the vicinity of the left preliminary seedling stand. In 1st another form of implementation of invention, it is a left view of the left operation tool and holding tool vicinity. In the 2nd another form of implementation of invention, it is a left side view showing the outline near the stand of the left preliminary seedling stand of the 1st state.

1 to 12, F indicates the front direction, B indicates the rear direction, U indicates the upward direction, and D indicates the downward direction. R indicates the right direction, and L indicates the left direction.

(Overall structure of riding type rice transplanter)
As shown in FIG. 1, in the riding type rice transplanter, a link mechanism 4 is supported in a vertically swingable manner at a rear portion of a body 3 provided with right and left front wheels 1 and right and left rear wheels 2. A hydraulic cylinder 5 is provided that extends to the rear side and that moves the link mechanism 4 up and down.

The seedling planting device 6 is supported by the rear part of the link mechanism 4, and a fertilizer application device 7 for supplying fertilizer to the rice field is provided across the rear part of the machine body 3 and the seedling planting device 6, and the seedling planting device 6 At the lower part on the front side, a leveling device 8 for leveling the rice field is supported.

As shown in FIGS. 1, 2, and 3, a plurality of preliminary seedling placing stands 31 and 32 are arranged on the right and left sides of the front part of the machine body 3.
(Structure of the front and rear support mechanism for supporting the preliminary seedling stand and the support mechanism so that the position of the preliminary seedling stand can be changed in the front-rear direction), and (operation tool for operating the preliminary seedling stand in the first state and the second state, holding) As described in (Structure of mechanism and holder), the preliminary seedling stand 31, 32 is supported by the body 3 via the front-rear support mechanism 37 and the support mechanism 45.

(Configuration of the front part of the aircraft)
As shown in FIGS. 1, 2 and 3, a support frame 23 is connected to a mission case 22 arranged in the front part of the machine body 3 and extends to the front side, and an engine (not shown) is supported by the support frame 23. Has been done. A hood 24 that covers the engine is provided at the front of the machine body 3.

A steering handle 25 for steering the front wheels 1, a speed change lever 26 for traveling, and an elevating lever 27 for operating the hydraulic cylinder 5 are provided above the bonnet 24.
The operation arm 53, which is arched in a front view, is supported by the support frame 23 so as to be operable in a standing posture (see FIGS. 1, 2, and 3) and a forward tilted posture in which the operating arm 53 is tilted forward from the standing posture. A center mascot 54 is provided on the upper part of the.

A floor 28 is provided from the right side and the left side of the hood 24 to the rear side of the hood 24, and a driver's seat 20 is arranged on an upper portion of a rear portion of the floor 28.
The worker moves in the left-right direction between the right and left spare seedling stand 31, 32 and the driver's seat 20 to get on and off the aircraft 3.

On the floor 28, there are right and left passages between the bonnet 24 and the right preliminary seedling stand 31, 32, and between the bonnet 24 and the left preliminary seedling stand 31, 32. The right or left passage is moved in the front-rear direction to get on and off the aircraft 3.

A brake pedal 55 is provided on the right side of the hood 24 on the floor 28, a brake lever 56 connected to the brake pedal 55 is provided, and a lock lever 57 is provided on the floor 28.

For example, when entering a paddy field over a ridge or when exiting a paddy field over a ridge, a worker descends from the machine body 3 and stands on the front side of the machine body 3 and sets the operation arm 53 in a forward leaning posture to operate. By holding the arm 53, the orientation of the machine body 3 is corrected and the lifting of the front portion of the machine body 3 is suppressed.

The operator extends the hand to operate the shift lever 26, or holds the brake lever 56 to operate the brake pedal 55. By engaging the lock lever 57 on the brake pedal 55 and the brake lever 56 in the depressed state (braking state), the brake pedal 55 and the brake lever 56 can be held in the depressed state (braking state).

(Configuration of seedling planting device)
As shown in FIG. 1, the seedling planting device 6 is provided with a planting transmission case 9, a rotating case 10, a planting arm 11, a float 12, a seedling stand 13, and the like.

The rotating case 10 is rotatably supported on the right and left portions of the rear part of the two planting transmission cases 9, and the planting arms 11 are supported on both ends of the rotating case 10. A seedling stand 13 is supported so as to be capable of reciprocating in the left-right direction.

As the seedling stand 13 is driven to reciprocate laterally in the left-right direction, the rotating case 10 is rotationally driven, and the planting arms 11 alternately take out the seedlings from the lower part of the seedling stand 13 and plant them on the rice field.

(Structure of fertilizer application)
As shown in FIG. 1, the fertilizer application device 7 is provided with a hopper 15, a feeding part 16, a blower 17, a groove making device 18, a hose 19, and the like.

On the rear side of the driver's seat 20 in the machine body 3, a hopper 15 for storing fertilizer and a feeding section 16 are supported, and a blower 17 is provided on the left lateral outside of the feeding section 16. The grooving device 18 is attached to the float 12, four grooving devices 18 are provided, and four hoses 19 are connected across the feeding portion 16 and the grooving device 18.

The fertilizer in the hopper 15 is fed out by the feeding part 16 and is supplied to the grooving device 18 through the hose 19 by the conveying wind of the blower 17. While the grooving device 18 forms a groove on the rice field, the grooving device is formed. Fertilizer is supplied from 18 to the ditch on the rice field.

(Structure of leveling device)
As shown in FIG. 1, the right and left support cases 14 supported by the seedling planting device 6 extend to the front side, and a drive shaft (not shown) extends across the front part of the support case 14. Is rotatably supported, and a large number of ground leveling bodies 21 are attached to the drive shaft.

The power of the seedling planting device 6 is transmitted from the planting transmission case 9 to the drive shaft via a transmission chain (not shown) of the support case 14, and the drive shaft and the ground leveling body 21 are rotated counterclockwise in FIG. It is driven to rotate, and the leveling body 21 leveles the rice field.

(Structure of the front and rear support mechanism that supports the stand for the preliminary seedling and the support mechanism so that the position can be changed in the front and rear direction)
As shown in FIGS. 1 to 4, the frame 29 is connected to the support frame 23 and extends from the support frame 23 to the right and left sides, and the bracket 30 is connected to the right end portion and the left end portion of the frame 29. ing.

The lower portions of the right and left support frames 33 are swingably supported around the horizontal axis P1 of the bracket 30 in the front-rear direction, and the lower portions of the right and left support arms 34 are horizontal axis of the bracket 30. The support frame 33 and the support arm 34 are supported on the P2 so as to be swingable back and forth and extend upward.

As shown in FIGS. 2 and 3, recesses 28a are formed in the right front part and the left front part of the floor 28, and the lateral width near the hood 24 on the floor 28 is the lateral width near the driver's seat 20 on the floor 28. Is smaller than. The bracket 30, the lower portion of the support frame 33, and the lower portion of the support arm 34 are arranged so as to enter the recess 28a of the floor 28 in a plan view.

As shown in FIGS. 3, 7, 8 and 9, the support member 35 bent into an angle shape is connected to the upper end portion of the support frame 33 so that the fulcrum shaft 33 a is outwardly attached to the upper end portion of the support frame 33. It is connected.

As shown in FIGS. 4, 7, and 8, a support member 36 formed by bending a plate material into a box shape is supported by a fulcrum shaft 33a of a support frame 33 so as to be swingable around a horizontal axis P3. ing. An upper end portion of the support arm 34 is swingably connected to an arm portion 36a extending from the support member 36 to the front side around an axis P4 in the left-right direction.

As shown in FIGS. 1, 4, and 6, the support frame 33, the support arm 34, and the support member 36 are configured as a parallel quadruple link in a side view. By swinging the support frame 33 and the support arm 34 back and forth, the support member 36 maintains the posture along the vertical direction, while the support frame 33 is at the center position B1 along the vertical direction, and the support frame 33 is on the front side. The position is changed in the front-rear direction to the front position B2 which is inclined to the front and the rear position B3 where the support frame 33 is inclined to the rear.

As shown in FIG. 3, right and left torsion springs 46 in which a round rod-shaped elastic material is bent are provided. The torsion spring 46 is arranged along the axis P1, one end of the torsion spring 46 is connected to the support frame 23, and the other end of the torsion spring 46 is connected to the support frame 33. The support frame 33 is biased by the torsion spring 46 from the front position B2 and the rear position B3 to the central position B1.

As described above, the front-back support mechanism 37 including the support frame 33, the support arm 34, the support member 36, and the like is provided. As described later (configuration of a support mechanism that supports the preliminary seedling placement table to the front and rear support mechanisms so as to be able to change the position between the first state and the second state), the preliminary seedling placement tables 31, 32 support the support mechanism 45. It is supported by the support member 36 and the support frame 33 via the support member 36 and the support frame 33.

The support frame 33 and the support arm 34 are provided on the right and left sides of the front part of the machine body 3, and the preliminary seedling stand 31, 32, the support mechanism 45 and the front and rear support mechanism 37 are provided on the front part of the machine body 3. It is provided in the right part and the left part. The preliminary seedling stand 31, 32 and the support mechanism 45 are supported by the front-rear support mechanism 37 at the central position B1, the front position B2, and the rear position B3 so that the position can be changed in the front-rear direction.

(Structure of the front-rear holding mechanism that can hold the front-rear supporting mechanism at the central position, the front position, and the rear position)
As shown in FIGS. 2, 3, 4, and 7, the front and rear operation tools 38 for bending the round bar material to artificially change the positions of the preliminary seedling stand 31, 32 and the support mechanism 45 in the front and rear direction. It is provided.

The front-rear operation tool 38 is rotatably supported around the axis P5 along the front-rear direction of the support member 36 and extends from the support member 36 to the front side and the rear side. As shown in FIGS. 7 and 8, inside the support member 36, a front and rear operation tool 38 is connected with a round bar-shaped engaging portion 38c.

The front end of the front-rear operation tool 38 is bent downward, and the front end of the front-rear operation tool 38 is provided with a handle portion 38a along the vertical direction, and the rear end of the front-rear operation tool 38 is bent downward. Accordingly, a handle portion 38b extending in the up-down direction is provided at the rear end portion of the front and rear operation tool 38.

As shown in FIGS. 7, 8 and 9, an arc-shaped guide hole 39 is opened in the supporting member 35 in a side view. The guide hole 39 is provided with a central holding portion 39a, a front holding portion 39b, and a rear holding portion 39c which are opened downward, and a check portion 39d which projects downward from the upper side of the central holding portion 39a.

The engaging portion 38c of the front and rear operation tool 38 is inserted into the guide hole 39. Inside the support member 36, a receiving plate 38 d is connected to the front-rear operation tool 38, and a spring 40 is attached between the receiving plate 38 d of the front-rear operation tool 38 and the inner surface of the support member 36. The front/rear operation tool 38 is biased in the counterclockwise direction in FIG. 8 by the spring 40, and the engagement portion 38c of the front/rear operation tool 38 has the center holding portion 39a, the front holding portion 39b, and the rear holding portion of the guide hole 39. It is urged toward the side entering 39c.

As described above, between the front-rear operation tool 38 and the support member 35, the preliminary seedling stand 31, 32 and the support mechanism 45 can be held at desired positions in the front-rear direction, and the preliminary seedling stand 31, 32, and A front-rear holding mechanism 61 capable of allowing the position change of the support mechanism 45 in the front-rear direction is provided, and the front-rear holding mechanism 61 is provided with an engaging portion 38c of the front-rear operating tool 38, a support member 35, a guide hole 39, and the like. Has been.

(Operation to the center position, front side position and rear side position by front and rear operation tools)
The state shown in FIGS. 4 and 9 is a state in which the preliminary seedling stand 31, 32 and the support mechanism 45 are operated to the central position B1 (see FIG. 6).

The handle portions 38a, 38b of the front-rear operation tool 38 are operated to the downward holding position C1 (see FIG. 8) along the up-down direction, and the engaging portion 38c of the front-rear operation tool 38 causes the center holding portion of the guide hole 39. 39a, the preliminary seedling stand 31, 32 and the support mechanism 45 are held at the central position B1 by the front-rear holding mechanism 61 (holding state of the front-rear holding mechanism 61).

An operator standing in a ridge or a paddy field on the front side of the machine body 3 can have a handle portion 38a of the front-rear operation tool 38, and a worker at the driver's seat 20 has a handle portion 38b of the front-rear operation tool 38. be able to.

As shown in FIGS. 8 and 9, the operator holds the handle portions 38a and 38b of the front-rear operation tool 38, and releases the front-rear operation tool 38 around the axis P5 in a slightly vertical direction along the left-right direction. When operated to the position C2, the engaging portion 38c of the front and rear operation tool 38 is pulled out upward from the central holding portion 39a of the guide hole 39 (the front and rear holding mechanism 61 is in a released state).

The operator pushes and pulls the front-rear operation tool 38 back and forth while maintaining the handle portions 38a and 38b of the front-rear operation tool 38 at the release position C2, thereby operating the preliminary seedling stand 31, 32 and the support mechanism 45. As shown in FIG. 6, the position can be artificially changed in the front-rear direction from the central position B1 to the front position B2 or the rear position B3.

As shown in FIG. 6 and FIG. 9, when the preliminary seedling stand 31, 32 and the support mechanism 45 are changed to the front position B2 (rear position B3), the support is maintained in the posture along the vertical direction. With respect to the member 36, the support member 35 is in a state of swinging about the axis P3, and the guide hole 39 swings around the axis P3 with respect to the engaging portion 38c of the front and rear operation tool 38.

At the front side position B2, the engagement portion 38c of the front and rear operation tool 38 is located above the front side holding portion 39b of the guide hole 39, and at the rear side position B3, the engagement portion 38c of the front and rear operation tool 38 is located behind the guide hole 39. It is located above the side holding portion 39c.

After changing the positions of the preliminary seedling stand 31, 32 and the support mechanism 45 to the front position B2 (rear position B3), the operator operates the front and rear operation tool 38 to the holding position C1 to engage the front and rear operation tool 38. The portion 38c is inserted into the front holding portion 39b (rear holding portion 39c) of the guide hole 39. As a result, the preliminary seedling stand 31, 32 and the support mechanism 45 are held at the front position B2 (rear position B3) shown in FIG. 6 by the front and rear holding mechanism 61 (holding state of the front and rear holding mechanism 61).

When the worker changes the positions of the preliminary seedling stand 31, 32 and the support mechanism 45 from the front position B2 to the central position B1 or the rear position B3, and from the rear position B3 to the central position B1 or the front position B2, the worker For holding the front and rear operation tools 38 by holding the handle portions 38a and 38b, the front and rear operation tools 38 may be operated to the release position C2, and the same operation as described above may be performed.

Since the posture of the release positions C2 of the handle parts 38a, 38b of the front-rear operation tool 38 and the position changing operation of the preliminary seedling stand 31, 32 and the support mechanism 45 in the front-rear direction intersect with each other, the operator moves forward and backward. It is easy to apply an operating force to the handle parts 38a and 38b of the operation tool 38, and it becomes easy to perform the position changing operation of the preliminary seedling stand 31, 32 and the support mechanism 45 in the front-rear direction.

When the operator changes the positions of the preliminary seedling stand 31, 32 and the support mechanism 45 from the front side position B2 to the rear side position B3 (the rear side position B3 to the front side position B2), the front and rear operation is performed at the middle position B1 on the way. The restraining portion 39d of the guide hole 39 hits the engaging portion 38c of the tool 38, the engaging portion 38c of the front-rear operating tool 38 is guided by the center holding portion 39a of the guide hole 39, and the front-rear operating tool 38 moves to the holding position C1. Operated.

As a result, the preliminary seedling stand 31, 32 and the support mechanism 45 are held at the central position B1 on the way, and the operator operates the front and rear operation tool 38 again to the release position C2 to set the preliminary seedling stand. The positions of the 31, 32 and the support mechanism 45 are changed from the central position B1 to the rear position B3 (front position B2).

(Structure of a support mechanism that supports the front and back support mechanism so that the position of the preliminary seedling stand can be changed between the first state and the second state)
As shown in FIGS. 4 and 7, the arm 36b is connected to the support member 36 and extends to the rear side, and the fulcrum shaft 36c is outwardly connected to the end of the arm 36b. ..

A circular pipe-shaped first support link 41 and a second support link 42 are provided. A central portion in the longitudinal direction of the first support link 41 is supported by the fulcrum shaft 33a of the support frame 33 so as to be swingable around the axis P3 in the left-right direction. A central portion in the longitudinal direction of the second support link 42 is supported by the fulcrum shaft 36c of the support member 36 so as to be swingable around the axis P6 in the left-right direction.

As shown in FIGS. 2, 3, 4, and 8, square pipe-shaped seedling stand frames 51 and 52 are provided.
One end of the first support link 41 is swingable around the axis P8 in the left-right direction, and is attached to the front part of the seedling stand frame 51 (the part from the front end 31a of the preliminary seedling stand 31 to the rear side). It is connected. One end of the second support link 42 is connected to the front-rear intermediate portion of the seedling stand frame 51 (the front-rear center portion of the preliminary seedling stand 31) so as to be swingable around the axis P7 in the left-right direction. ..

The other end of the first support link 41 is connected to the rear part of the seedling stand frame 52 (the part from the front-rear center part of the preliminary seedling stand 32 to the rear side) swingably around the axis P10 in the left-right direction. Has been done. The other end of the second support link 42 is swingably connected to the rear part of the seedling stand frame 52 (the rear end part 32b of the preliminary seedling stand 32) around the axis P9 in the left-right direction.

As shown in FIGS. 1, 2, and 3, the preliminary seedling stand 31, 32 is integrally formed of synthetic resin, and the arch-shaped seedling stopping members 43, 44 are provided in front of the preliminary seedling stand 31, 32. It is provided detachably on the rear part and the rear part.

As shown in FIG. 3 and FIG. 4, brackets 51a and 52a are provided on the front and rear of the seedling placing table frames 51 and 52, respectively, and the brackets 51a and 52a are provided around the shafts P11 and P12 in the front-rear direction. The preliminary seedling placing stands 31 and 32 are supported so that their postures can be changed between a horizontal use posture (see FIGS. 1, 2, and 3) and a standing storage posture.

A pressing member 47 in which a round bar-shaped elastic material is bent is provided on the bracket 51a of the seedling stand frame 51. The pressing member 47 can be operated by a toggle function into a standing release position (see FIGS. 3 and 4) and a holding position in which it is pressed by the preliminary seedling stand 31 in the use position.

When an operator puts an empty seedling box (not shown) or a seedling scooping plate (not shown) on the preliminary seedling stand 31 in the use posture, the operator operates the holding member 47 in the holding posture to press the holding member. Use 47 to keep empty seedling boxes and seedling scoops from being blown away by the wind.

As described above, the support mechanism 45 including the first support link 41, the second support link 42, the seedling stand frames 51, 52, and the like is provided.
As described later (operation of the preliminary seedling placing table and the supporting mechanism to the first state and the second state by the operation tool), the preliminary seedling placing tables 31 and 32 are arranged at a predetermined interval in the vertical direction. The supporting mechanism 45 allows the supporting member 36 and the supporting frame 33 to change their positions between the first state A1 (see FIG. 4) and the second state A2 (see FIG. 5) arranged in a row in the front-rear direction. It is supported.

(Positional relationship between the first support link and the second support link in the support mechanism)
As shown in FIGS. 4, 6 and 7, the axis P3 (the fulcrum shaft 33a of the support frame 33) has an upper preliminary seedling stand 31 and a lower preliminary seedling stand in the first state A1 in a side view. 32, and is arranged on an imaginary line that passes through the front-rear center portions of the preliminary seedling placing stands 31, 32 in the first state A1 in the up-down direction.

The axis P6 (the fulcrum shaft 36c of the support member 36) is arranged between the upper preliminary seedling stand 31 and the lower preliminary seedling stand 32 in the first state A1 in a side view, It is arranged on the rear side of the core P3.

A portion of the first support link 41 in the first state A1 that extends obliquely to the front side from the axis P3 of the first support link 41 to a portion from the front end portion 31a of the upper preliminary seedling placing table 31 in the first state A1 to the rear side. Are connected so as to be swingable around the axis P8.

In the portion extending obliquely to the lower rear side from the axis P3 of the first support link 41 in the first state A1, rearward from the front-rear central portion of the lower preliminary seedling placing table 32 in the first state A1. The side portion is connected to be swingable around the axis P10.

In the portion of the second support link 42 in the first state A1 that extends obliquely to the upper front side from the axis P6 of the second support link 42, the front-rear center portion of the upper preliminary seedling placing table 31 in the first state A1 has the axis P7. It is swingably connected around.

The rear end portion 32b of the lower preliminary seedling placing table 32 in the first state A1 is provided on the portion of the second support link 42 in the first state A1 that extends obliquely downward to the rear side from the axis P6. , Is pivotably connected around the axis P9.

In a side view, the first support link 41 is arranged near the central portion in the front-rear direction of the preliminary seedling stand 31, 32 in the first state A1, and the second support link 42 is the rear side of the first support link 41. In the first state A1 of the preliminary seedling stand 31, 32, the first support link 41 and the second support link 42 are arranged behind the preliminary seedling stand 31, 32.

Thereby, in the first state A1 of the preliminary seedling stand 31, 32, between the front part of the upper preliminary seedling stand 31 and the front part of the lower preliminary seedling stand 32, the first support link 41 and An area E1 where the second support link 42 does not exist is generated.

In the first state A1 of the preliminary seedling placing bases 31, 32, the first support link 41 and the second support link 42 extend from the shaft core P3 and the shaft core P6 to the front oblique upper side, and the rear oblique lower side. Since it is extended to, the region E1 where the first support link 41 and the second support link 42 do not exist between the front part of the upper preliminary seedling stand 31 and the front part of the lower preliminary seedling stand 32 is The area near the lower preliminary seedling stand 32 is large.

As shown in FIG. 2, in the first state A1 of the preliminary seedling stand 31, 32, when the operator of the driver's seat 20 visually observes the right front and the left diagonal front (see the line of sight F1), the upper preliminary seedling stand The first support link 41 and the second support link 42 rarely limit the field of view (line of sight F1) when the front side is viewed through between 31 and the lower preliminary seedling stand 32.

When the operator of the driver's seat 20 visually observes the diagonally downward right and left diagonally forwards to see the rice field (see line of sight F1), in the area E1 where the first support link 41 and the second support link 42 do not exist. By visually observing the vicinity of the lower seedling stand 32 on the lower side, the first support link 41 and the second support link 42 are less likely to limit the field of view (line of sight F1).

(Structure of operation tool, holding mechanism and holding tool for operating the preliminary seedling placing table in the first state and the second state)
As shown in FIGS. 2, 4 and 5, in the rear part of the right and left seedling stand frames 51 (the part on the rear side of the connecting portion (axis P7) of the preliminary seedling stand 31 and the second support link 42), The right and left operation tools 48 are connected and extended to the rear side. As a result, the operation tool 48 is provided along the front-rear direction on the lateral side portion of the auxiliary seedling stand 31 on the left-right center of the machine body, and the handle portion 48a of the operation tool 48 is disposed along the front-rear direction. There is.

The bracket 51b connected to the rear part of the right and left seedling stand frame 51 (the part on the rear side of the connecting part (the axis P7) between the preliminary seedling stand 31 and the second support link 42) holds the right and left parts. The tool 49 is supported so as to be vertically swingable around a horizontal axis P13, and is extended to the rear side so as to be arranged below the operating tool 48. Thus, the holder 49 is provided on the lateral side portion of the preliminary seedling stand 31 on the lateral center side of the machine body along the front-rear direction.

The holding tool 49 can be operated in the vertical direction to a holding position D1 which is separated downward from the operating tool 48, and a releasing position D2 which is closer to the operating tool 48 above the holding position D1. The recessed first engaging portion 49 a and the second engaging portion 49 b are provided at the base of the holder 49. The spring 50 is attached to the bracket 51b of the seedling stand frame 51, and the holder 50 is biased to the holding position D1 by the spring 50.

As shown in FIGS. 4, 5 and 7, in the right and left second support links 42, one side and the other side sandwiching a portion (shaft P7) swingably connected to the seedling stand frame 51. A pin-shaped first locking portion 42a and a second locking portion 42b are provided in the portion. A pin-shaped stopper portion 36d is provided on the arm portion 36b of the support member 36.

As described above, between the second support link 42 and the holder 49, the holder 49 (the first engaging portion 49a and the second engaging portion 49b) and the first locking portion 42a of the second supporting link 42 are provided. Also, a holding mechanism 62 having the second locking portion 42b and the like is provided.

The holding mechanism 62 sets the posture of the second support link 42 with respect to the preliminary seedling stand 31 as described below (operation of the preliminary seedling stand and the support mechanism to the first state and the second state by the operation tool). By fixing, the preliminary seedling stand 31, 32 can be held in the first state A1 and the second state A2, and by allowing the second support link 42 to swing with respect to the preliminary seedling stand 31, the preliminary seedling It is possible to permit the operation of the rests 31, 32 to the first state A1 and the second state A2.

(Operation of the preliminary seedling stand and the support mechanism to the first state and the second state by the operation tool)
The state shown in FIGS. 1 to 4 is a state in which the plurality of preliminary seedling placing stands 31 and 32 are operated in the first state A1 in which they are arranged at predetermined intervals in the vertical direction.

In the state shown in FIG. 4, the second support link 42 hits the stopper portion 36d of the support member 36 from above, the holder 49 is operated to the holding position D1, and the first engaging portion 49a of the holder 49 moves to the first position. 2 Engaging with the 1st engaging part 42a of the support link 42 (The 1st engaging part 42a of the 2nd support link 42 is inserted in the 1st engaging part 49a of the holder 49), and a preliminary seedling stand 31 and 32 are in the state of being held in the first state A1 (holding state of the holding mechanism 62).

When the operator holds the operating tool 48 with his/her hand while the preliminary seedling placing stands 31, 32 are held in the first state A1, the operator may hold the operating tool 48 with his/her hand. Then, the holder 49 can be operated from the holding position D1 to the release position D2, and the first engaging portion 49a of the holder 49 is disengaged from the first locking portion 42a of the second support link 42 ( Releasing state of the holding mechanism 62).

As shown in FIGS. 4 to 5, the worker holds the operation tool 48 and the holder 49 at the release position D2, and pulls the operation tool 48 and the holder 49 at the release position D2 toward the driver seat 20 side (rear side). When operated downward while operating, the first support link 41 and the second support link 42 swing around the axes P3 and P6 in the clockwise direction of FIGS. 4 and 5, and the upper preliminary seedling stand 31 Is changed to the lower side of the driver seat 20 side (rear side), and the lower auxiliary seedling stand 32 is changed to the upper side of the front side.

As shown in FIG. 5, when the first support link 41 hits the stopper portion 36d of the support member 36 from above, the swing of the first support link 41 and the second support link 42 is stopped. In, the second locking portion 42 b of the second support link 42 faces the second engaging portion 49 b of the holder 49.

The state shown in FIG. 5 is the second state A2 in which a plurality of preliminary seedling stand 31, 32 are arranged in a line in the front-rear direction. In the second state A2, the upper seedling stand 31 on the upper side in the first state A1 is on the driver seat 20 side (rear side), and the lower seedling stand 32 on the lower side in the first state A1 is on the front side. The front end 31a of the stand 31 and the rear end 32b of the preliminary seedling stand 32 are in contact with each other.

In the state shown in FIG. 5, when the operator releases the holder 49, the spring 50 causes the holder 49 to swing from the release position D2 to the holding position D1, and the second engaging portion 49b of the holder 49 moves to the second position. By engaging the second locking portion 42b of the support link 42 (the second locking portion 42b of the second support link 42 is inserted into the second engaging portion 49b of the holder 49), the preliminary seedling stand 31 , 32 are held in the second state A2 (holding state of the holding mechanism 62).

In the second state A2 shown in FIG. 5, the operator operates the holding tool 49 from the holding position D1 to the releasing position D2 as described above, holds the operating tool 48 and the holding tool 49 at the releasing position D2, and operates the operating tool 48. By operating the holder 49 at the release position D2 upward while pushing it forward, the preliminary seedling stand 31, 32 can be moved from the second state A2 to the first state A1 shown in FIG. it can.

Since the posture of the handle portion 48a of the operating tool 48 and the moving direction (vertical direction) of the preliminary seedling stand 31, 32 intersect, the operator applies an operating force to the handle portion 48a of the operating tool 48. It is easy to hang, and it becomes easy to operate the preliminary seedling stand 31, 32 from the first state A1 to the second state A2 and from the second state A2 to the first state A1.

The operator operates the front-rear operation tool 38 to maintain the preliminary seedling stand 31, 32 in the first state A1 (second state A2), while the preliminary seedling stand 31, 32 and the support mechanism 45 are moved to the center. The position can be changed to the position B1, the front side position B2, and the rear side position B3 (see the above-mentioned (operation to the center position, front side position and rear side position by the front and rear operation tool)).

(Position relation of each part in the first state of the preliminary seedling stand)
As shown in FIGS. 1 to 4, in the first state A1 of the preliminary seedling placing stands 31 and 32, the positional relationship of each part is as described below.

The handle 48a and the holder 49 of the operation tool 48, and the handle 38b of the front-rear operation tool 38 are provided on the lateral side of the driver seat 20 side (the left and right center side of the machine body) of the upper preliminary seedling stand 31 in plan view. It is provided. The handle portion 48a and the holder 49 of the operation tool 48, and the handle portion 38b of the front-rear operation tool 38 are arranged on the rear side of the front-rear support mechanism 37 (support frame 33) in a side view, and a preliminary seedling stand. It is arranged on the front side of the rear end portions 31b, 32b of 31, 32.

The positions of the handle 48a of the operating tool 48 and the holding tool 49 in the front-rear direction and the positions of the handle 38b of the front-rear operating tool 38 in the front-rear direction are arranged at substantially the same position in a side view. The handle portion 38a of the front-rear operation tool 38 is arranged rearward of the front end portions 31a, 32a of the preliminary seedling stand 31, 32 in a side view.

The holding part 48a of the operating tool 48 and the holding tool 49 operated to the release position D2 are arranged above the holding part 38b of the front-rear operating tool 38 in a side view. The handle portion 38a of the front and rear operation tool 38 is arranged between the front portion of the upper preliminary seedling placing table 31 and the lower portion of the lower preliminary seedling placing table 32 in a side view.

The holding portion 38b of the front and rear operation tool 38 and the holder 49 operated to the holding position D1 are arranged between the rear portion of the upper preliminary seedling placing table 31 and the second support link 42 in a side view. The rear part of the front-rear operation tool 38 is disposed between the handle portion 48a of the operation tool 48 and the holding tool 49 operated to the holding position D1 in a side view.

The handle portion 48a and the holding tool 49, the front and rear operation tool 38, and the support member 36 of the operation tool 48 are arranged at positions that do not extend above the upper end portion 31c of the preliminary seedling stand 31 in a side view. The handle portion 48a of the ingredient 48 is arranged at a position that does not extend below the lower end portion 31d of the preliminary seedling stand 31 in a side view.

The holder 49 operated to the holding position D1 is arranged at a position that is below the lower end 31d of the preliminary seedling stand 31 in a side view, and the holder 49 operated to the release position D2 is a side surface. It is arranged at substantially the same position as the lower end portion 31d of the preliminary seedling stand 31 as viewed.

The front and rear operation tools 38 (handles 38a, 38b) are in the plane view of the operation tool 48 and the holder 49 in the left and right center side of the machine body (the passage side between the hood 24 and the preliminary seedling stand 31, 32) (the above-mentioned). (Refer to the configuration of the front part of the fuselage).
When the handle portions 38a and 38b of the front-rear operation tool 38 are operated to the holding position C1 (see FIG. 8), the handle portions 38a and 38b of the front-rear operation tool 38 face downward and protrude toward the above-mentioned passage side. do not do.

In a state in which the preliminary seedling placing stands 31, 32 and the support mechanism 45 are operated to the central position B1 (see FIG. 6), the support frame 33 is located in the front and rear central portions of the preliminary seedling placing stands 31, 32 in a side view. The preliminary seedling placing stands 31 and 32 are arranged symmetrically with the support frame 33 as the center line.

Since the seedling stopping members 43 and 44 are provided at the front and rear portions of the preliminary seedling placing stands 31 and 32, the seedlings placed on the preliminary seedling placing stands 31 and 32 move to the front side (rear side). Therefore, the seedling stand 31 or 32 does not fall to the front side (rear side).

(Positional relationship of each part in the second state of the preliminary seedling stand)
As shown in FIG. 5, in the second state A2 of the preliminary seedling placing stands 31 and 32, the positional relationship between the respective parts is as described below.

The rear ends 31b of the right and left preliminary seedling stand 31 are arranged at substantially the same position as the driver's seat 20 in a side view.
The handle portion 48a and the holder 49 of the operation tool 48, and the handle portion 38b of the front-rear operation tool 38 are arranged on the rear side of the front-rear support mechanism 37 (support frame 33) in a side view, and a preliminary seedling stand. It is arranged on the front side of the rear end portion 31 b of 31.

The front-rear operation tool 38 and the support member 36 are arranged at positions that are above the upper end portions 31c, 32c of the preliminary seedling stand 31, 32 in a side view, and the handle portions 38a, 38b of the front-rear operation tool 38 are provided. However, it is arranged at a position overlapping the preliminary seedling stand 31, 32 in a side view. The operation tool 48 and the holding tool 49 are arranged on the rear side of the handle portion 38b of the front and rear operation tool 38 in a side view.

The rear seedling stand 31 on the rear side is arranged slightly below the front seedling stand 32 on the front side. In this case, the worker removes the seedling stopping member 43 in the front part of the spare seedling stand 31 and the seedling stopping member 44 in the rear part of the spare seedling stand 32 from the spare seedling stand 31, 32, or The posture (position) is changed so as not to interfere with the movement of the seedlings over the placing stands 31 and 32.

In a state in which the preliminary seedling stand 31, 32 and the support mechanism 45 are operated to the central position B1 (see FIG. 6), the abutting portion of the preliminary seedling stand 31, 32 (the front end of the preliminary seedling stand 31 is viewed from the side. The support frame 33 is located at the rear end 32b) of the portion 31a and the preliminary seedling stand 32, and the preliminary seedling stands 31 and 32 are arranged symmetrically with the support frame 33 as the center line.

When the preliminary seedling stand 31, 32 and the support mechanism 45 are operated to the central position B1 (see FIG. 6), the pressing member 47 is arranged slightly behind the support frame 33 in a side view.

As shown in FIG. 4, when the preliminary seedling stand 31, 32 and the support mechanism 45 are operated to the central position B1 (see FIG. 6), the preliminary seedling stand 31, 32 is operated to the first state A1. Then, in a side view, the pressing member 47 is arranged slightly forward of the support frame 33. As a result, in the first state A1 and the second state A2 of the preliminary seedling stand 31, 32, the positional change of the pressing member 47 in the front-rear direction is small.

The positional relationship between the operating tool 48 and the holding tool 49, the front and rear operating tools 38, etc. other than the above description is the same as the positional relationship described in the above-mentioned (positional relationship of each part in the first state of the preliminary seedling placing table). is there.

(First Embodiment of the Invention)
The preliminary seedling stand 31, 32 may be supported as described below.
As shown in FIG. 10, the preliminary seedling stand 31, 32 is supported by the front and rear support mechanism 37 and the support mechanism 45 shown in FIGS. 1 to 9.

The support frame 58 is connected to the upper portion of the support member 36 and extends to the front side, is bent in an arc shape in a side view, and extends to the upper side. In the support frame 58, an upper position spaced apart from the support member 36 by a predetermined distance extends to the rear side. A preliminary seedling stand 59 is attached to the support frame 58.
The preliminary seedling placing table 59 is arranged at a predetermined distance above the preliminary seedling placing table 31 and is arranged slightly on the left and right center side of the machine body from the rear seedling placing plan 31 and the preliminary seedling placing stands 31 and 32.

As shown in FIG. 11, the operating tool 48 is connected to the rear part of the seedling placing frame 51 and extends upward, and the handle 48a of the operating tool 48 extends rearward. The handle portion 48a of the operation tool 48 is arranged at a position which is located above the upper end portion 31c of the preliminary seedling stand 31 in a side view, and the handle 48a of the preliminary seedling stand 31 and the preliminary seedling stand 59 are located in a side view. It is located in between.

The holder 49 is supported so as to be able to swing back and forth around a horizontal axis P14 in the rear part of the seedling stand frame 51, and the recessed first portion is formed in the downward extending portion of the holder 49. The engaging portion 49a and the second engaging portion 49b are provided. The holder 49 is arranged on the front side of the operation tool 48, and is arranged at a position protruding above the upper end portion 31c of the preliminary seedling stand 31 in a side view.

The holder 49 can be vertically operated at an upper holding position D1 and a lower releasing position D2. A toggle spring 60 is attached across the holder 49 and the seedling stand frame 51, and the toggle spring 60 biases and holds the holder 49 at the holding position D1 and the releasing position D2.

When the operator operates the holder 49 to the release position D2, the first engaging portion 49a and the second engaging portion 49b of the holder 49 cause the first engaging portion 42a and the second engaging portion 42a of the second support link 42 to move. The holder 49 is disengaged from the locking portion 42b, and the holder 49 is held at the release position D2 by the toggle spring 60 (the holding mechanism 62 is kept in the released state). The operator can operate the preliminary seedling stand 31, 32 in the first state A1 and the second state A2 by holding the holding portion 48a of the operating tool 48 without holding the holding tool 49.

As shown in FIG. 11, while the spare seedling stand 31, 32 is operated to the second state A2, the holder 49 is operated (held) to the release position D2, and the spare seedling stand 31, 32 is moved to the second position A2. When the second state A2 is operated to the first state A1, the second support link 42 swings around the axis P7, and the second locking portion 42b of the second support link 42 moves to the upper side in FIG. And hit the upper part of the holder 49. As a result, the holder 49 is oscillated around the axis P14, and the toggle spring 60 automatically operates the holder 49 from the release position D2 to the holding position D1.

When the preliminary seedling stand 31, 32 is operated to the first state A1, the first engaging portion 49a of the holding tool 49 engages with the first locking portion 42a of the second support link 42 (holding tool). The first engaging portion 49a of 49 inserts the first locking portion 42a of the second support link 42), and the preliminary seedling stand 31, 32 is held in the first state A1 (holding state of the holding mechanism 62). ).

With the preliminary seedling stand 31, 32 being operated to the first state A1, the holder 49 is operated (held) to the release position D2, and the preliminary seedling stand 31, 32 is moved from the first state A1 to the second state. When operated to A2, the second support link 42 swings around the axis P7, and the second locking portion 42b of the second support link 42 hits the upper portion of the holder 49. As a result, the holder 49 is oscillated around the axis P14, and the toggle spring 60 automatically operates the holder 49 from the release position D2 to the holding position D1.

When the preliminary seedling stand 31, 32 is operated to the second state A2, the second engagement portion 49b of the holder 49 engages with the second locking portion 42b of the second support link 42 (the holder). The second locking portion 42b of the second support link 42 is inserted into the second engaging portion 49b of 49), and the preliminary seedling stand 31, 32 is held in the second state A2 (holding state of the holding mechanism 62). ).

(Second Embodiment of the Invention)
As shown in FIG. 12, in the support mechanism 45, the first support link 41 and the second support link 42 may be arranged in the front and rear opposite directions in a side view.

As shown in FIG. 12, a portion of the upper auxiliary seedling stand 31 in the first state A1 is provided on a portion of the first support link 41 in the first state A1 that extends obliquely upward and rearward from the axis P3. A portion from the rear end portion 31b to the front side is swingably connected around the axis P8.

From the front end portion 32a of the lower preliminary seedling stand 32 in the first state A1 to the portion that extends obliquely downward to the front side from the axis P3 of the first support link 41 in the first state A1 The side portion is connected to be swingable around the axis P10.

The rear end portion 31b of the upper preliminary seedling placing table 31 in the first state A1 is provided with a shaft in a portion of the second support link 42 in the first state A1 that extends obliquely upward and rearward from the axis P6. It is swingably connected around the core P7.

In the portion of the second support link 42 in the first state A1 that extends obliquely downward to the front side from the axis P6 of the second support link 42, the front and rear central portions of the lower preliminary seedling placing table 32 in the first state A1 are It is swingably connected around the core P9.

When the preliminary seedling stand 31, 32 is operated from the first state A1 to the second state A2, the upper preliminary seedling stand 31 in the first state A1 becomes the front side, and the lower preliminary stand in the first state A1. The seedling stand 32 becomes the driver seat 20 side (rear side), and the rear end portion 31b of the preliminary seedling stand 31 and the front end portion 32a of the preliminary seedling stand 32 are in contact with each other.
In this configuration, the operation tool 48, the holder 49, and the holding mechanism 62 are preferably provided on the preliminary seedling stand 32 (seedling stand frame 52).

(Third Alternative Embodiment of the Invention)
The above-described support frame 58 and preliminary seedling stand 59 shown in FIG. 10 (first embodiment of the invention) are added to the configurations shown in FIGS. 1 to 9 and (second embodiment of the invention). May be.

In addition to the central position B1, the front side position B2, and the rear side position B3, the preliminary seedling placing bases 31, 32 and the support mechanism 45 may be configured to be positionally changeable to a large number of positions.
The operation tool 48 and the holding tool 49 may be directly attached to the preliminary seedling stand 31, 32.
In the front-rear operation tool 38, the portion extending from the support member 36 to the front side and the handle portion 38a may not be provided.
The configurations shown in FIGS. 1 to 9 and the configurations shown in FIGS. 10 to 12 may be applied to the three or more preliminary seedling stand 31, 32.

INDUSTRIAL APPLICABILITY The present invention can be applied to a preliminary seedling stand for a riding type rice transplanter.

3 Aircraft 20 Driver's seat 31 Preliminary seedling stand 31b Rear end 32 Preparatory seedling stand 32b Rear end 37 Front-rear support mechanism 38 Front-rear operation tool 38b Handle 45 Support mechanism 48 Operation tool 48a Handle 61 Front-rear retention mechanism 62 Holding mechanism A1 1st state A2 2nd state P5 Shaft core

Claims (7)

The preliminary seedlings are placed in a first state in which a plurality of preliminary seedling placement stands are arranged at predetermined intervals in the vertical direction, and in a second state in which the plurality of preliminary seedling placement stands are arranged in a row in the front-rear direction. A support mechanism that supports the mount so that the position can be changed,
An operation tool for artificially operating the preliminary seedling stand in the first state and the second state,
A holding mechanism capable of holding the preliminary seedling stand in the first state and the second state, and a holding mechanism that allows operation of the preliminary seedling stand in the first state and the second state is provided,
A front and rear support mechanism that supports the preliminary seedling stand and the support mechanism so that the position can be changed in the front and rear direction,
A front and rear operation tool for artificially changing the position of the preliminary seedling stand and the support mechanism in the front and rear direction,
It is provided with a front and rear holding mechanism capable of holding the preliminary seedling stand and the support mechanism at a desired position in the front-rear direction, and permitting position change of the preliminary seedling stand and the support mechanism in the front-rear direction. A riding rice transplanter. The preliminary seedling stand, the support mechanism and the front-rear support mechanism are provided on the right and left parts of the front part of the aircraft having a driver's seat,
In the first state and the second state, the handle part of the operation tool and the handle part of the front-rear operation tool are arranged on the rear side of the front-rear support mechanism in a side view, and the spare seedling is placed. The riding-type rice transplanter according to claim 1, wherein the riding-type rice transplanter is arranged on the front side of the rear end of the stand. The riding rice transplanter according to claim 2, wherein, in the first state, the handle portion of the operation tool is disposed above the handle portion of the front and rear operation tool in a side view. The riding type rice transplanter according to claim 2 or 3, wherein, in the second state, the handle portion of the operation tool is disposed behind the handle portion of the front and rear operation tool in a side view. The riding part according to any one of claims 2 to 4, wherein the handle part of the operation tool is arranged along the front-rear direction, and the handle part of the front-rear operation tool is arranged along the up-down direction. Type rice transplanter. The front-rear operation tool is rotatably supported around an axis along the front-rear direction,
When the handle portion of the front-rear operation tool is operated in a posture along the vertical direction, the front-rear holding mechanism is operated in a holding state, and the handle portion of the front-rear operation tool is operated in a posture along the left-right direction. Then, the riding type rice transplanter according to claim 5, wherein the front-rear holding mechanism is operated in a released state. The holding mechanism is
In a state where the preliminary seedling stand is operated in the first state and the second state, it is possible to maintain the released state, and
The riding type rice transplanter according to any one of claims 1 to 6, wherein when the preliminary seedling placing table is operated in the first state and the second state, the preliminary seedling placing table automatically enters a holding state.

Images