JP2020000047A - Rice field implement - Google Patents

Abstract

To provide a rice field implement in which a work device and ground leveling device are supported on a rear part of a machine body, and improved in ground leveling performance of the ground leveling device.SOLUTION: A ground leveling device 26 comprises: a drive shaft 34 arranged along a lateral direction; and a ground leveling body 35 which is attached to the drive shaft 34 and driven so as to integrally rotate with the drive shaft 34 to level the ground of a rice field G. The ground leveling device comprises: a first rolling support part 51 for supporting the work device in a rolling possible manner around a first shaft core P11 in a cross direction; and a second rolling support part 52 for supporting the ground leveling device 26 in a rolling possible manner around a second shaft core P12 in the cross direction. A rolling regulation part 52d is provided which regulates a rolling actuation of the ground leveling device 26 with respect to the second rolling support part 52 to a preset prescribed range.SELECTED DRAWING: Figure 6

Description

  TECHNICAL FIELD The present invention relates to a support structure for a leveling device in a paddy field working machine such as a riding type rice transplanter or a riding type sowing machine provided with a leveling device for leveling a rice field.

  As the leveling device provided in the paddy field working machine, a drive shaft arranged along the left and right direction and a leveling body that is mounted on the drive shaft and leveles the rice field by rotating integrally with the drive shaft is provided. There are things.

Patent Literature 1 discloses a riding type rice transplanter that is an example of a paddy field working machine provided with the above-described leveling device.
In Patent Literature 1, a seedling planting device (corresponding to a working device) is supported by a rear portion of a link mechanism supported by a rear portion of the body and extended rearward so as to freely roll around a longitudinal axis. . A leveling device is supported at the front of the seedling planting device, and the leveling device is located between the aircraft and the seedling planting device.

JP 2013-79 A

  In Patent Document 1, the seedling planting device is supported by the seedling planting device that is supported at the rear of the link mechanism so as to be freely rotatable. Therefore, the seedling planting device and the soil leveling device are integrally rolled around a common axis. It is operating. This leaves room for improvement in terms of improving the leveling performance of the leveling device.

  An object of the present invention is to improve the leveling performance of a leveling device in a paddy field working machine in which a working device and a leveling device are supported at a rear portion of an airframe.

Paddy working machine of the present invention,
A working device that is supported by the rear of the aircraft and supplies agricultural materials to the rice field;
A leveling device that is supported between the aircraft and the working device and that levels a field is provided,
The ground leveling device has a drive shaft arranged along the left and right direction, and a ground leveling body that is mounted on the drive shaft and that is grounded by rotating integrally with the drive shaft to level a rice field,
A first rolling support portion that supports the working device so as to freely roll around a first axis in the front-rear direction;
A second rolling support portion that supports the terrain device in a freely rolling manner around a second axial center in the front-rear direction,
A rolling restricting section is provided for restricting a rolling operation of the leveling device with respect to the second rolling support section to a predetermined range set in advance.

According to the present invention, the working device can perform a rolling operation around the first axis so as to be suitable for supplying agricultural materials to the rice field. On the other hand, the leveling device can perform a rolling operation around the second axis so as to be suitable for leveling the rice field.
This makes it possible for the leveling device to perform a rolling operation so as to be suitable for the leveling of the rice field while reducing the effect of the rolling operation of the working device on the leveling device, thereby improving the leveling performance of the leveling device. Can be.

  According to the present invention, the rolling operation of the leveling device is restricted to a predetermined range by the rolling restricting unit, so that the rolling operation of the leveling device is suppressed by suppressing the rolling operation of the leveling device more than necessary. The leveling performance can be improved.

In the present invention,
It is preferable that the rolling restricting portion is provided on the second rolling support portion.

  According to the present invention, by providing the rolling restricting portion in the second rolling support portion, the support member can be shared, which is advantageous in terms of simplification of the structure.

In the present invention,
It is preferable that a yawing restricting portion is provided to restrict a yawing operation of the leveling device around the vertical axis with respect to the second rolling support portion.

  According to the present invention, since the yawing operation of the leveling device is regulated by the yawing regulating portion, a large load due to the yawing operation of the leveling device can be prevented from being applied to the second rolling support portion, and the second rolling support portion can be avoided. Can be improved in durability.

In the present invention,
It is preferable that the yawing control section is provided on the second rolling support section.

  According to the present invention, by providing the yaw restricting portion in the second rolling support portion, the support member can be shared, which is advantageous in terms of simplification of the structure.

In the present invention,
A link mechanism that is supported at the rear of the body so as to be able to move up and down and that extends rearward is provided.
It is preferable that the first rolling support portion and the second rolling support portion are provided at a rear portion of the link mechanism, and the working device and the leveling device are supported at a rear portion of the link mechanism.

  According to the present invention, the first rolling support portion and the second rolling support portion are provided at the rear portion of the link mechanism, so that the working device is left at the first rolling support portion, and the leveling device is moved from the second rolling support portion. It can be removed. Conversely, it is possible to remove the working device from the first rolling support portion while leaving the leveling device in the second rolling support portion, so that a different form of paddy working machine can be obtained.

In the present invention,
A rolling mechanism that performs a rolling operation of the working device with respect to the link mechanism;
An inclination sensor that detects an inclination angle in the left-right direction with respect to a horizontal plane of the working device,
It is preferable that a rolling control unit that operates the rolling mechanism be provided so that the detection value of the tilt sensor has a preset tilt angle.

  According to the present invention, the working mechanism is rolled by the rolling mechanism so that the detection value of the tilt sensor becomes the set tilt angle without being affected by the rolling action of the body and the link mechanism, and the working apparatus has a predetermined posture. Therefore, the supply of agricultural materials to the rice field by the working device is stably performed.

In the present invention,
When the inclination angle difference between the inclination angle with respect to the horizontal plane due to the rolling operation of the working device and the inclination angle with respect to the horizontal surface due to the rolling operation of the ground leveling device is going to be larger than a preset angle difference, the working device of the working device It is preferable that an interlocking member that transmits a rolling operation to the leveling device to prevent the inclination angle difference from becoming larger than the set angle difference is connected across the working device and the leveling device. .

  As described above, when the working device performs a rolling operation around the first axis so as to be suitable for supplying agricultural materials to the rice field, and the soil leveling device performs a rolling operation around the second axis so as to be suitable for the leveling of the rice field, The proper posture of the working device and the proper posture of the leveling device are rarely greatly different from each other, and the proper posture of the working device and the proper posture of the leveling device are often relatively close.

According to the present invention, in the state in which the working device performs the rolling operation by the rolling mechanism as described above, the interlocking member is connected between the working device and the leveling device. The rolling equipment operates to follow the road.
As a result, when the working device performs the rolling operation to the proper posture, the leveling device operates in a rolling manner and is guided to a state close to the proper posture, so that the rolling device can be rolled without delay to the proper posture. By operating, the leveling performance of the leveling device can be improved.

In the present invention,
The second rolling support is disposed on the rear side of the leveling device,
A rolling frame that is rotatably supported around the second axis by the second rolling support portion and that passes through an upper side of the leveling device and extends to a front side of the leveling device;
A supporting mechanism attached to an extending portion of the rolling frame and extending rearward, the supporting mechanism rotatably supporting the drive shaft,
It is preferable that the leveling device is supported in a freely rolling manner by the second rolling support portion.

  According to the present invention, since the support mechanism is disposed on the front side of the leveling device, the leveling device can be made to approach the rear working device without being affected by the support mechanism. The overall front-to-rear length can be reduced, and the working device and the leveling device can be arranged compactly.

  As described above, if the leveling device can be approached to the rear working device, the entire working device and leveling device should be approached to the front body by the amount that the leveling device approaches the rear working device. Therefore, the front-rear length from the front end of the body to the rear of the working device can be reduced.

In the present invention,
It is preferable that a moving trajectory of the extending portion of the rolling frame due to the lifting / lowering operation of the link mechanism overlaps with a rear wheel of the body in side view.

  According to the present invention, the entire working device and the leveling device can be brought closer to the front body by the amount that the movement trajectory of the extended portion of the rolling frame overlaps with the rear wheel of the body in side view, The front-rear length from the front end to the rear of the working device can be reduced.

In the present invention,
An auxiliary wheel mounted concentrically with the rear wheel is provided,
It is preferable that the movement trajectory is disposed between the rear wheel and the auxiliary wheel in a plan view.

  According to the present invention, in a paddy field working machine, when an auxiliary wheel is provided concentrically with the rear wheel, the work is performed while avoiding interference between the extended portion of the rolling frame and the rear wheel and the auxiliary wheel without difficulty. Since the entire device and the leveling device can be brought closer to the front body, the front-rear length from the front end of the body to the rear of the working device can be suppressed.

It is a left view of a riding type rice transplanter. It is a top view near a seedling planting apparatus and a leveling apparatus. It is a front view of a seedling planting device and a leveling device. It is a vertical section left side view near the center float in a seedling planting apparatus. It is a top view near the front part of a center float in a seedling planting device. It is a vertical section left side view near a leveling device. It is a perspective view of a 2nd rolling support part and a rolling frame. It is a cross-sectional plan view of a rear axle case. It is a vertical left view of the rear axle case. It is the schematic which shows the cooperation state of a control apparatus and each part. It is a top view near a seedling planting device and a leveling device in a 1st different form of an embodiment of the invention.

In the embodiment of the present invention, a riding type rice transplanter which is an example of a paddy field working machine is shown.
The front-rear direction and the left-right direction in the embodiment of the present invention are described as follows unless otherwise specified. The traveling direction on the forward side during traveling of the body 11 is “front”, and the traveling direction on the reverse side is “rear”. The direction corresponding to the right side with respect to the forward posture in the front-back direction is “right”, and the direction corresponding to the left side is “left”.

(Overall configuration of riding rice transplanter)
As shown in FIG. 1, the riding type rice transplanter has a link mechanism 3 supported at the rear of a body 11 having right and left front wheels 1 and right and left rear wheels 2 so as to be able to move up and down. And a hydraulic cylinder 4 for raising and lowering the link mechanism 3 is provided.

  At the rear of the link mechanism 3, a seedling planting device 5 (corresponding to a working device) and a leveling device 26 are supported. The fuselage 11 is provided with a steering wheel 14 for steering the driver's seat 13 and the front wheels 1.

(Overall configuration of seedling planting device)
As shown in FIGS. 1, 2, and 4, the seedling planting device 5 includes a support frame 12, a feed case 15, a planting transmission case 6, a rotating case 7, a planting arm 8, a center float 9, and side floats 53, 54, A seedling rest 10 is provided.

  A center float 9 is supported (arranged) in the left and right central portions of the seedling planting device 5 in plan view. Side floats 53 and 54 are supported (arranged) on the right and left sides of the center float 9 in plan view.

  The support frame 12 has a quadrangular cross section, and is disposed along the left-right direction at the front lower part of the seedling planting apparatus 5. A feed case 15 is connected to the left and right central portions of the support frame 12.

  The four planting transmission cases 6 are connected to the rear surface of the support frame 12 at predetermined intervals in the left-right direction, and extend rearward. A rotating case 7 is rotatably supported on the right and left sides of the rear portion of the planting transmission case 6, and a pair of planting arms 8 are rotatably supported on both ends of the rotating case 7.

  With the above configuration, the rotating case 7 is driven to rotate in the counterclockwise direction in FIGS. 1 and 4 as the seedling rest 10 is driven to reciprocate laterally to the left and right, and the two sets of planting arms 8 are moved. Then, the seedlings (corresponding to agricultural materials) are alternately taken out from the lower part of the seedling rest 10 and planted (supplied) on the rice field G.

(Travel transmission system to front and rear wheels)
As shown in FIG. 1, a transmission case 17 is supported at the front of the body 11, and an engine 19 is supported at a support frame 18 connected to the front of the transmission case 17.

  A hydrostatic type continuously variable transmission 20 is connected to the left lateral side of the transmission case 17, and the power of the engine 19 is transmitted to the continuously variable transmission 20 via a transmission belt 21. The continuously variable transmission 20 is configured to be capable of continuously changing the speed to a neutral position, a forward side and a reverse side, and the continuously variable transmission 20 is controlled by a shift lever 22 provided on the left side of the steering handle 14. Can be operated.

The power of the continuously variable transmission 20 is transmitted to the right and left front wheels 1 via a subtransmission (not shown) and a front wheel differential (not shown) inside the transmission case 17.
A rear axle case 23 supporting the right and left rear wheels 2 is supported at a rear portion of the body 11, and power branched immediately before the front wheel differential device is transmitted to the rear axle case 23 via a transmission shaft 24. You.

(Rear axle case)
As shown in FIG. 1, right and left upper links 42 are supported at the lower part of the body 11 so as to be vertically swingable and extend rearward. Right and left lower links 43 are supported by the lower part of the body 11 so as to be swingable up and down, and extend rearward.

  A rear axle case 23 is connected to rear portions of the upper link 42 and the lower link 43, and a lateral rod (not shown) is connected across the body 11 and the rear axle case 23. Right and left suspension springs 44 are connected across the body 11 and the rear axle case 23. With the above configuration, the rear axle case 23 is attached to the rear part of the body 11 by a five-link type suspension mechanism.

  As shown in FIGS. 8 and 9, in the rear axle case 23, a frontward boss portion 23 a in the horizontal direction is provided on the front surface of the rear axle case 23, and the input shaft 45 faces the frontward in the horizontal direction. It is supported by. The transmission shaft 24 (see FIG. 1) is connected to the front end of the input shaft 45, and the power of the engine 19 is transmitted to the input shaft 45.

  A rear wheel transmission shaft 46 is supported inside the rear axle case 23 along the left-right direction. Inside the rear axle case 23, a bevel gear 45a is provided integrally with the input shaft 45, a bevel gear 46a is connected to the rear wheel transmission shaft 46, and a bevel gear 45a of the input shaft 45 and a bevel gear 46a of the rear wheel transmission shaft 46 are provided. Is biting.

  Side clutches 47 are provided on the right and left portions of the rear wheel transmission shaft 46. A transmission shaft 48 and an axle 49 are provided on the right and left portions of the rear axle case 23, and the rear wheel 2 is supported on the axle 49. The transmission gear 47a of the side clutch 47 is engaged with the transmission gear 48a of the transmission shaft 48, and the transmission gear 48b of the transmission shaft 48 is engaged with the transmission gear 49a of the axle 49.

  With the above configuration, the power transmitted from the transmission shaft 24 to the input shaft 45 is transmitted to the bevel gear 45a of the input shaft 45, the bevel gear 46a of the rear wheel transmission shaft 46, the rear wheel transmission shaft 46, the side clutch 47, the transmission shaft 48, and the axle. The power is transmitted to the right and left rear wheels 2 via the transmission 49.

(Side clutch operation system)
As shown in FIG. 8, the side clutch 47 is urged into a transmission state by a spring 47b provided inside. An operation shaft 50 is rotatably supported by the boss 23c of the rear axle case 23. A steering member (not shown) for steering the front wheel 1 and an arm 50a of the operation shaft 50 are linked to each other. 65.

  When the front wheel 1 is steered within the range of the right and left set angles sandwiching the straight traveling position, the right and left side clutches 47 are operated in the transmission state by the spring 47b of the side clutch 47, Power is transmitted to the right and left rear wheels 2.

  When the front wheel 1 is steered to the right (left) beyond the right (left) set angle, the right (left) link member 65 is pulled toward the steering member side of the front wheel 1 so that the right wheel is steered. The (left) operation shaft 50 is rotated.

  When the right (left) operation shaft 50 is rotated, the collar 64 is pushed toward the right (left) side clutch 47 by the end of the right (left) operation shaft 50, and the right (left) is operated. The right (left) side clutch 47 is operated in a disengaged state against the spring 47b of the side clutch 47. Thereby, power is transmitted to the left (right) rear wheel 2, and a right turn (left turn) is performed in a state where the right (left) rear wheel 2 freely rotates.

  When the front wheel 1 is steered within the range of the right and left set angles, the right (left) side clutch 47 is operated in the transmission state by the spring 47b of the side clutch 47, and the right and left rear wheels are operated. The state returns to the state in which the power is transmitted to No. 2.

(Transmission system to seedling planting equipment)
As shown in FIG. 1, an inter-stock transmission (not shown) and a planting clutch 38 (see FIG. 10) are provided inside the transmission case 17.

  In the transmission case 17, the power branched from between the continuously variable transmission 20 and the auxiliary transmission (see the above-mentioned (driving transmission system to the front and rear wheels)) is transmitted via the inter-stock transmission and the planting clutch 38. And transmitted to the transmission shaft 25, and transmitted from the transmission shaft 25 to a transmission mechanism (not shown) inside the feed case 15.

  The power of the transmission shaft 25 is transmitted from the transmission mechanism of the feed case 15 to the lateral feed shaft (not shown) of the seedling rest 10, and the planting transmission case 6 is transmitted via the transmission shaft (not shown). And transmitted to the rotating case 7 via a transmission mechanism (not shown) inside the planting transmission case 6.

(Elevation operation of the seedling planting device by the elevation operation lever)
As shown in FIGS. 1 and 10, an elevating operation lever 39 is provided on the right side of the driver's seat 13. The raising / lowering operation lever 39 is operable at a raising position, a neutral position, a lowering position, and a planting position, and is mechanically connected to the planting clutch 38.

  The control device 40 is provided in the body 11, and the operation position of the elevating operation lever 39 is input to the control device 40. The hydraulic cylinder 4 is provided with an electromagnetic operation type control valve 41 for supplying and discharging hydraulic oil, and the elevation control unit 108 is provided in the control device 40 as software.

  When the raising / lowering operation lever 39 is operated to the raising position, the neutral position, the lowering position, and the planting position, the control valve 41 and the planting clutch 38 are operated by the control device 40 (the raising / lowering control unit 108) and the raising / lowering operation lever 39 to It is operated as described.

  When the raising / lowering operation lever 39 is operated to the raised position, the planting clutch 38 is operated to the disengaged state, the control valve 41 is operated to the raised position, the hydraulic cylinder 4 is contracted, and the seedling planting device 5 is moved. To rise.

  When the raising / lowering operation lever 39 is operated to the neutral position, the planting clutch 38 is operated to the disengaged state, the control valve 41 is operated to the neutral position, the hydraulic cylinder 4 is stopped, and the raising and lowering of the seedling planting device 5 is performed. Stops.

  When the raising / lowering operation lever 39 is operated to the lowered position, the planting clutch 38 is operated to be in the disengaged state, the control valve 41 is operated to the lowered position, the hydraulic cylinder 4 is extended, and the seedling planting device 5 is operated. Descend.

  When the center float 9 touches the rice field surface G in a state where the raising / lowering operation lever 39 is operated to the lowering position, the raising / lowering control of the seedling planting apparatus 5 is performed as described later in (elevation control of the seedling planting apparatus). It will be in a working state. Thereby, the control valve 41 and the hydraulic cylinder 4 are operated so that the seedling planting apparatus 5 is automatically raised and lowered so that the seedling planting apparatus 5 is maintained at the set height H1 from the rice field G. Become.

When the raising / lowering operation lever 39 is operated to the planting position, the raising / lowering control of the seedling planting apparatus 5 is operated as in the above-described lowering position, and the planting clutch 38 is operated in the transmission state.
When the planting clutch 38 is operated in the transmission state, power is transmitted to the seedling planting device 5, and the seedling planting device 5 is operated as described in the above (overall configuration of the seedling planting device). .

(Elevation control of seedling planting equipment)
In this riding type rice transplanter, the control valve 41 is operated by the control device 40 (elevation control unit 108) so that the seedling planting device 5 is maintained at the set height H1 from the rice field G, and the link mechanism is operated by the hydraulic cylinder 4. 3 is provided with a raising / lowering operation for raising / lowering the seedling planting apparatus 5 to maintain the planting depth of the seedling by the planting arm 8 at a set depth. The raising and lowering control of the seedling planting apparatus 5 will be described below.

  As shown in FIGS. 4, 5, and 10, a support shaft 55 is rotatably supported on the lower part of the planting transmission case 6 around a horizontal axis P <b> 1, and a support arm 55 a connected to the support shaft 55. Extends to the rear side. The rear portions of the center float 9 and the side floats 53 and 54 are vertically swingably supported around a left-right axis P2 at the rear portion of the support arm 55a.

  The planting depth lever 56 is connected to the support shaft 55 and extends obliquely upward, and the planting depth lever 56 is inserted into a lever guide 57 connected to the support frame 12. By engaging the planting depth lever 56 with the lever guide 57 and fixing the position, the position of the shaft center P2 (the support arm 55a of the support shaft 55) with respect to the seedling planting apparatus 5 is determined. The set height H1 is determined.

  A potentiometer type height sensor 58 is supported by the support frame 12, and a linking member 59 is connected to the detection arm 58 a of the height sensor 58 and the front part of the center float 9. The height from the center float 9 (the rice field surface G) to the seedling planting device 5 is detected by the height sensor 58. The detection value of the height sensor 58 is input to the control device 40.

  The detection value of the height sensor 58 in a state where the height sensor 58 is located at the set height H2 from the rice field G is the reference value. When the detected value of the height sensor 58 is the reference value, the control valve 41 is operated to the neutral position, the hydraulic cylinder 4 is stopped, the seedling planting device 5 is located at the set height H1, Is the set planting depth corresponding to the set height H1.

  When the seedling planting device 5 is lowered from the state where the seedling planting device 5 is located at the set height H1 (the state where the height sensor 58 is located at the set height H2) (the planting depth of the seedling is set at the set planting height). When the depth is greater than the depth), the height sensor 58 is lowered together with the seedling planting apparatus 5 with respect to the center float 9 that follows the ground surface G on the ground.

  Thereby, based on the detection value of the height sensor 58, the control valve 41 is operated to the raised position, the hydraulic cylinder 4 is contracted, and the seedling planting device 5 and the height sensor 58 are operated to be raised. When the detection value of the height sensor 58 returns to the reference value (when the height sensor 58 returns to the set height H2), the control valve 41 is operated to the neutral position, the hydraulic cylinder 4 is stopped, and the seedling planting device is stopped. 5 returns to the set height H1, and the planting depth of the seedling returns to the set planting depth.

  When the seedling planting device 5 rises from the state where the seedling planting device 5 is located at the set height H1 (the state where the height sensor 58 is located at the set height H2) (the planting depth of the seedling is set at the set planting height). When the depth becomes shallower than the depth), the height sensor 58 rises together with the seedling planting device 5 with respect to the center float 9 that follows the ground surface G on the ground.

  Thereby, based on the detection value of the height sensor 58, the control valve 41 is operated to the lowered position, the hydraulic cylinder 4 is extended, and the seedling planting device 5 and the height sensor 58 are operated to be lowered. When the detection value of the height sensor 58 returns to the reference value (when the height sensor 58 returns to the set height H2), the control valve 41 is operated to the neutral position, the hydraulic cylinder 4 is stopped, and the seedling planting device is stopped. 5 returns to the set height H1, and the planting depth of the seedling returns to the set planting depth.

  As described above, the seedling planting apparatus 5 is automatically moved up and down based on the detection value of the height sensor 58 so that the seedling planting apparatus 5 is maintained at the set height H1 from the rice field G. Therefore, the planting depth of the seedling is maintained at the set planting depth corresponding to the set height H1.

By operating the planting depth lever 56 to change the position of the shaft center P2 (the support arm 55a of the support shaft 55), the set height H1 can be changed.
As a result, the seedling planting apparatus 5 is moved up and down so as to be maintained at the changed set height H1, and the planting depth (set planting depth) of the seedling by the planting arm 8 is changed. can do.

(Support structure for height sensor)
As shown in FIGS. 4 and 5, a support bracket 76 is connected to a front portion of the support frame 12. A first link 81 formed by bending a plate material into a channel shape is swingably supported around a left-right axis P5 of the support bracket 76, and a second link 81 formed by bending a bar material into a channel shape. A link 82 is swingably supported around a left-right axis P6 of the support bracket 76.

  The support member 80 is swingably supported at the ends of the first link 81 and the second link 82, and a parallel quadruple link is configured by the support bracket 76, the first link 81, the second link 82, and the support member 80. ing.

  Height sensor 58 is attached to support member 80. A linking rod 89 is connected between the planting depth lever 56 and the lower part of the first link 81, and by holding the planting depth lever 56 by engaging it with the lever guide 57, the support member 80 The position is fixed.

  As described in the above (elevation control of the seedling planting apparatus), when the set planting depth is changed to the deep side by the planting depth lever 56 (the set height H1 of the seedling planting apparatus 5 is lowered to the low side). 4), the first link 81 is pivoted clockwise in FIG. 4 around the axis P5 by the linkage rod 89, and the position of the height sensor 58 is changed to the higher side to set the height. Is maintained at H2.

  When the set planting depth is changed to the shallow side by the planting depth lever 56 (when the set height H1 of the seedling planting apparatus 5 is changed to the high side), the first link 81 is linked by the link rod 89 in conjunction with this. Is pivoted in the counterclockwise direction in FIG. 4 around the axis P5, and the position of the height sensor 58 is changed to the lower side to maintain the set height H2.

  The support arm 90 is swingably supported around the axis P7 in the left-right direction of the support member 80. A spring 91 extends between the end of the support arm 90 and the front of the detection arm 58a of the height sensor 58. It is connected. The center float 9 is urged downward by the spring 91 via the detection arm 58a of the height sensor 58 and the linking member 59.

  By fixing the end of the support arm 90 to one of the plurality of fixing holes 80a of the support member 80 with a fixing pin 92, the angle of the support arm 90 with respect to the support member 80 is changed, and the urging force of the spring 91 is reduced. Can be changed.

  A rod 93 is slidably supported by a bracket 80b fixed to the support member 80, and a spring 94 is provided between the front end of the rod 93 and the bracket 80b of the support member 80.

  When the center float 9 swings largely upward, the contact portion 58b of the detection arm 58a of the height sensor 58 hits the front end of the rod 93 and pushes up the rod 93 to compress the spring 94. A large upward swing is suppressed.

(Rolling support structure of seedling planting device)
As shown in FIGS. 1, 3, and 6, the link mechanism 3 is connected to an upper link 3a and a lower link 3b supported on the body 11 so as to swing up and down, and to rear portions of the upper link 3a and the lower link 3b. A vertical link 3c is provided.

  The vertical link 3c of the link mechanism 3 is formed by casting, and a boss-shaped first rolling support portion 51 is provided below the vertical link 3c of the link mechanism 3. A rolling shaft 15a is connected to the front of the feed case 15 in a forward direction, and the rolling shaft 15a of the feed case 15 is connected to the first rolling support portion 51 so as to freely roll around the first shaft center P11 in the front-rear direction. Have been.

  Thereby, the first rolling support portion 51 is provided at the rear portion (the vertical link 3c) of the link mechanism 3, and the seedling planting device 5 can freely roll around the first axis P11 in the front-rear direction. It is supported by 51.

(Rolling control of seedling planting equipment)
As shown in FIGS. 3 and 10, the inclination sensor 95 is fixed to the feed case 15, and the inclination angle of the seedling planting device 5 in the left-right direction with respect to the horizontal plane (field surface G) is detected by the inclination sensor 95. The detection value of the sensor 95 is input to the control device 40. The rolling control unit 109 is provided in the control device 40 as software.

  The inclination angle setting unit 96 is provided in the seedling planting apparatus 5, and an operation signal of the inclination angle setting unit 96 is input to the control device 40. The tilt angle setting unit 96 is a dial switch type that is manually rotated, and sets (changes) a set tilt angle. The set tilt angle is set at an arbitrary position between a right tilt position where the right portion of the seedling planting device 5 slightly lowers and a left tilt position where the left portion of the seedling planting device 5 slightly lowers across the horizontal position. can do.

  A rolling mechanism 97 is provided above the vertical link 3c of the link mechanism 3. The rolling mechanism 97 includes a pair of wires 97a that are pushed and pulled in the left-right direction, a gear mechanism (not shown) that pushes and pulls the wires 97a, and an electric motor 97b.

  A support frame 98 is connected to the right and left portions of the support frame 12, and a horizontal frame 99 is connected over the right and left support frames 98. A frame 100 is connected to the front part of the upper part of the seedling rest 10 along the left-right direction, and the frame 100 (the seedling rest 10) is supported by the horizontal frame 99 so as to be able to reciprocate and move laterally in the left-right direction. I have.

  The spring 101 is connected to a bracket 100a fixed to the right and left ends of the frame 100 and an arm 97c fixed to the rolling mechanism 97. A spring 102 is connected across the wire 97 a of the rolling mechanism 97 and the right and left portions of the horizontal frame 99.

  As a result, the right or left spring 101 is extended as the seedling rest 10 is reciprocated and laterally driven, and the seedling planting device 5 is lowered to the right with respect to the body 11 (link mechanism 3) ( Rolling operation to the left-down position) is suppressed.

  The rolling mechanism 97 (electric motor 97b) is operated by the control device 40 (rolling control unit 109) based on the detection value of the inclination sensor 95, and the seedlings are planted through the wire 97a and the spring 102 of the rolling mechanism 97. Since the device 5 operates in a low-long operation, the tilt angle of the seedling planting device 5 is maintained at the set tilt angle set by the tilt angle setting unit 96.

(Overall configuration of leveling equipment)
As shown in FIGS. 1, 2, and 6, in the leveling device 26, the drive shaft 34 disposed along the left-right direction, and the field surface G is attached to the drive shaft 34 and driven to rotate integrally with the drive shaft 34. A leveling body 35 for leveling, a leveling input unit 29 attached to a drive shaft 34, a mudguard cover 36, a spacer 37, and the like are provided.

  In the seedling planting apparatus 5, as described in (the support structure of the leveling device) (elevation structure of the leveling device) and the outline of the support of the leveling device, the leveling device 26 is supported by the rear portion of the link mechanism 3. The ground leveling device 26 is disposed between the rear wheel 2 of the body 11 and the seedling planting device 5 in a side view.

(Supporting structure for leveling equipment)
As shown in FIGS. 3, 6, and 7, right and left support members 16 are connected to the rear portions of the upper link 3a and the lower link 3b of the link mechanism 3 together with the vertical link 3c. The right and left support members 27 are connected to the lower part of the right and left support members 16 and extend downward, and the second rolling support part 52 is connected to the lower part of the right and left support members 27. ing.

  The second rolling support portion 52 is formed by bending a plate material, and includes a front portion 52b and right and left side surface portions 52c. The upper portions of the right and left side surface portions 52c are provided with the right and left support members 27. Is connected to the lower part.

  The rolling shaft 52a is connected to the front part 52b of the second rolling support part 52 in a forward direction. The lower part of the extending part of the right and left lateral surface parts 52c of the second rolling support part 52 becomes the right and left rolling restriction parts 52d. The front portions of the right and left lateral surface portions 52c of the second rolling support portion 52 become the right and left yaw regulating portions 52e.

  As shown in FIGS. 2, 3, 6, and 7, a rolling frame 28 having a round pipe shape is provided. Boss portions 28a are provided at the left and right central portions of the rolling frame 28, and arcuate support arms 28b in a side view are connected to right and left ends of the rolling frame 28, and extend forward. The boss 28a of the rolling frame 28 is connected to the rolling shaft 52a of the second rolling support 52 so as to freely roll around the first axis P12 in the front-rear direction.

  Right and left shaft supports 30 for rotatably supporting the drive shaft 34 are provided. An arm portion 30a extends upward from the right and left shaft support portions 30, and a connection frame 31 is connected across the arm portions 30a of the right and left shaft support portions 30.

  An upper link 61 is supported swingably up and down and extends rearward around a horizontal axis P3 at a front portion of a support arm 28b of the rolling frame 28, and extends rearward. It is swingably connected to the arm 30a of the section 30.

  A lower link 66 is supported swingably up and down and extends rearward around a horizontal axis P4 at the front of the support arm 28b of the rolling frame 28, and extends rearward. It is swingably connected to the arm 30a of the section 30.

  Thus, in the rolling frame 28, a support mechanism 72 of a parallel link mechanism having the upper link 61, the lower link 66, and the shaft support 30 is provided, and the drive shaft 34 is rotatable by the right and left support mechanisms 72. Supported. Since the connection frame 31 is connected across the right and left support mechanisms 72, the right and left support mechanisms 72 move up and down integrally without shifting.

  As shown in FIGS. 2, 6, and 7, a bracket 28d is connected to a support arm 28b of the rolling frame 28. A right (left) interlocking member 75 is connected across a right portion (left portion) of the support frame 12 (the seedling planting apparatus 5) and a right (left) bracket 28d of the rolling frame 28.

  The interlocking member 75 is rod-shaped, and the interlocking member 75 is connected to the support frame 12 (the seedling planting apparatus 5) and the bracket 28d of the rolling frame 28 so as to be vertically swingable, and a rubber bush ( (Not shown).

(Elevation structure of leveling equipment)
As shown in FIGS. 2, 6, and 7, in the left support mechanism 72, the upper link 61 is provided with a fan-shaped elevating gear 61a in a side view, and the left support arm 28b of the rolling frame 28 is provided with a bracket 28c. Are connected.

  The gear case 32 and the electric motor 33 are supported by the bracket 28 c of the rolling frame 28, and the pinion gear 32 a of the gear case 32 is engaged with the lifting gear 61 a of the upper link 61. A spring 63 is connected across the connection frame 31 and the support member 27, and the spring 63 urges the support mechanism 72 upward.

  When the pinion gear 32 a of the gear case 32 is driven to rotate by the electric motor 33, the upper link 61 of the left support mechanism 72 swings up and down around the axis P <b> 3, and the right and left support mechanisms 72 support the shaft support section. 30 is moved up and down to change the position of the leveling device 26 up and down.

(Overview of the support of the leveling equipment)
As shown in FIGS. 2, 6, and 7, the leveling device 26 is supported by the right and left support mechanisms 72 so as to be able to move up and down on the rolling frame 28, and the second rolling support 52 and the rolling frame 28 allow the second shaft center. Rolling is supported around P12.

  The first rolling support portion 51 and the second rolling support portion 52 are provided at the rear portion (the vertical link 3c) of the link mechanism 3, and the second shaft center P12 (the second rolling support portion 52) is connected to the first shaft center. It is arranged at a position lower than P11 (first rolling support portion 51).

  When the leveling device 26 (rolling frame 28) performs a large rolling operation around the second axis P12, the rolling frame 28 hits the right or left rolling restricting portion 52d of the second rolling support portion 52 from below, thereby leveling the ground. The rolling operation of the device 26 (rolling frame 28) is stopped.

  Thereby, the rolling operation of the leveling device 26 with respect to the second rolling support portion 52 is performed in a predetermined range (the rolling frame 28 hits the right and left rolling regulating portions 52d of the second rolling support portion 52 from below. Range).

  When the ground leveling device 26 (rolling frame 28) performs a rolling operation, the rolling frame 28 moves up and down along the right and left yaw regulating portions 5e of the second rolling support portion 52.

  Even if the leveling device 26 (rolling frame 28) attempts to yaw around the vertical axis passing through the boss portion 28a of the rolling frame 28, the rolling frame 28 is moved to the right or left yaw regulating portion of the second rolling support portion 52. By hitting 5e, the yawing operation of the leveling device 26 (rolling frame 28) is regulated.

  An interlocking member 75 is connected across the support arm 28b of the rolling frame 28 and the support frame 12 (the seedling planting apparatus 5). When the interlocking member 75 swings up and down based on the rolling operation of the seedling planting device 5 and the rolling operation of the ground leveling device 26, the rolling operation of the seedling planting device 5 and the ground leveling device 26 are performed independently of each other.

  The inclination angle difference between the inclination angle with respect to the horizontal plane due to the rolling operation of the seedling planting device 5 and the inclination angle with respect to the horizontal plane due to the rolling operation of the ground leveling device 26 is the swing range of the interlocking member 75 (set angle difference set in advance). When the rolling operation of the seedling planting device 5 is attempted to be larger than the above, the rolling operation of the seedling planting device 5 is transmitted to the ground leveling device 26 via the interlocking member 75, and the rolling operation is performed so that the ground leveling device 26 follows the seedling planting device 5. Thus, the state in which the above-described inclination angle difference exceeds the swing range (set angle difference set in advance) of the interlocking member 75 is suppressed.

  As described in the above-mentioned (rolling control of the seedling planting apparatus), the inclination angle of the seedling planting apparatus 5 is maintained at the set inclination angle, so that the inclination angle of the ground leveling device 26 is close to the set inclination angle. Thus, the leveling device 26 is guided by the interlocking member 75.

  The rolling frame 28 (the boss portion 28a) and the second rolling support portion 52 are arranged on the rear side of the leveling device 26, and the support arm 28b of the rolling frame 28 passes above the leveling device 26, and 26 is extended to the front side.

  A support mechanism 72 (upper link and lower link 66) is attached to an extension of the support arm 28b of the rolling frame 28 and extends rearward. The drive shaft 34 is moved by the support mechanism 72 (shaft support 30). It is rotatably supported.

As shown in FIG. 6, when the seedling planting device 5 and the ground leveling device 26 are moved up and down by the link mechanism 3, the extending portion of the support arm 28 b of the rolling frame 28 passes through the movement trajectory K 1. The trajectory K1 and the rear wheel 2 overlap in side view.
In this case, in a state where the seedling planting device 5 is operated to descend to the position where it touches the rice field surface G, the extended portion (movement trajectory K1) of the support arm 28b of the rolling frame 28 overlaps with the rear wheel 2 in a side view. I haven't.

  As shown in FIG. 2, an auxiliary wheel 73 is mounted on the axle 49 concentrically with the rear wheel 2. The movement trajectory K1 (the support arm 28b of the rolling frame 28) is arranged between the rear wheel and the auxiliary wheel 73 in plan view.

(Structure on the rear axle case side in the transmission system to the leveling device)
As shown in FIGS. 2, 8, and 9, in the rear axle case 23, a rearward boss portion 23b in the horizontal direction is provided on the rear surface of the rear axle case 23, and the output shaft 60 is supported by the boss portion 23b. I have. A bevel gear 60 a is provided integrally with the output shaft 60, and the bevel gear 60 a of the output shaft 60 is engaged with the bevel gear 46 a of the rear wheel transmission shaft 46.

  The output case 85 is externally fitted to the output shaft 60 so as to be located on the rear side of the boss 23b of the rear axle case 23. An output shaft 86 is supported at the lower part of the output case 85 so as to face backward in the horizontal direction. Inside the output case 85, a transmission gear 87 connected to the output shaft 60 is engaged with a transmission gear 88 externally fitted to the output shaft 86 so as to be relatively rotatable.

  Inside the output case 85, the ground adjustment clutch 62 is provided between the output shaft 86 and the transmission gear 88. The leveling clutch 62 is provided with a shift member 69 fitted externally so as to rotate and slide integrally with the output shaft 86 by a spline structure, and a spring 70 for urging the shift member 69 toward the transmission gear 88.

  The power of the engine 19 is transmitted to the input shaft 45 via the transmission shaft 24 (see FIG. 1), and transmitted to the rear wheel transmission shaft 46 via the bevel gear 45a of the input shaft 45 and the bevel gear 46a of the rear wheel transmission shaft 46. And transmitted to the rear wheel 2. The power transmitted to the input shaft 45 is transmitted to the bevel gear 60 a of the output shaft 60 via the bevel gear 45 a of the input shaft 45 and the bevel gear 46 a of the rear wheel transmission shaft 46.

In the leveling clutch 62, when the shift member 69 is operated by the spring 70 to the transmission position where it engages with the transmission gear 88, the power of the input shaft 45 is transmitted to the bevel gear 45a of the input shaft 45, the bevel gear 46a of the rear wheel transmission shaft 46, and the output shaft 60. The power is transmitted to the output shaft 86 via the transmission gears 87 and 88 and the leveling clutch 62.
In the leveling clutch 62, when the shift member 69 is operated to a blocking position away from the transmission gear 88 against the spring 70, the transmission of power from the input shaft 45 to the output shaft 86 is blocked.

  In the leveling clutch 62, an operation rod (not shown) is connected across an operation section (not shown) for operating the shift member 69 to the cutoff position against the spring 70 and the lower link 3b of the link mechanism 3. Have been.

  As described in the above (raising / lowering operation of the seedling planting device by the raising / lowering operation lever), the link mechanism 3 is moved to the position where the seedling planting device 5 (the center float 9 and the side floats 53, 54) is in contact with the rice field surface G. When the lowering operation is performed, the shift member 69 (the leveling clutch 62) is operated to the transmission position by the spring 70 by the lowering operation of the operation rod.

  When the seedling planting apparatus 5 (the center float 9 and the side floats 53, 54) is moved upward by the link mechanism 3 to a position away from the rice field surface G to the upper side, the shift member 69 ( The leveling clutch 62) is operated to the cut-off position.

(Structure on the leveling device side in the transmission system to the leveling device)
As shown in FIG. 2, in the front part of the center float 9, the right and left parts of the front part of the center float 9 are located on the rear side with respect to the left and right central parts of the front part of the center float 9 in plan view. Thus, the front part of the center float 9 is formed in an arc shape in plan view.

  The leveling input unit 29 is attached to the left end of the spacer 37 and is attached to the front left portion of the front of the center float 9 on the drive shaft 34. It is attached to a portion between the left support mechanisms 72.

  Thus, the front portion of the center float 9 is in a state of being inserted between the right terrain body 35 and the terrain input unit 29 (the left terrain body 35) in plan view. The front part of the center float 9 overlaps with the leveling input unit 29 (leveling body 35) in a side view.

  As shown in FIGS. 2, 6, and 7, in the leveling input unit 29, the input shaft 77 is supported forward. The front part of the leveling transmission shaft 71 is connected to the rear end of the output shaft 86 (see FIGS. 8 and 9) of the output case 85 via the universal joint 78, and the rear part of the leveling transmission shaft 71 is connected to the universal joint. It is connected to the input shaft 77 of the leveling input unit 29 via 79. The leveling transmission shaft 71 is configured to be expandable and contractable by a spline structure.

Inside the leveling input unit 29, a bevel gear (not shown) is provided on the input shaft 77. A bevel gear (not shown) is connected to the left side (opposite the center float 9) of the spacer 37 with respect to the bevel gear of the input shaft 77, and the bevel gear of the input shaft 77 and the bevel gear of the spacer 37 are connected to each other. Bite.
Thereby, the power transmitted to the output shaft 86 is transmitted to the input shaft 77 of the leveling input unit 29 via the leveling transmission shaft 71.

  The support mechanism 72 is a parallel link mechanism having the upper link 61, the lower link 66, and the shaft support 30 as described in the above-mentioned (support structure of the leveling device) (elevation structure of the leveling device). Accordingly, when the shaft support 30 is moved up and down by the support mechanism 72 to change the position of the leveling device 26 up and down, the shaft support 30 moves up and down in parallel while maintaining the posture.

  As shown in FIGS. 2 and 7, since the posture maintaining member 74 is attached across the leveling input unit 29 and the connection frame 31, even if the position of the leveling device 26 is changed up and down, the leveling input unit Numeral 29 moves up and down in parallel while maintaining the input shaft 77 in a forward facing posture.

(Leveling condition of leveling device)
As described in the above (structure on the rear axle case side in the transmission system to the leveling device), when the leveling clutch 62 is operated to the transmission position, the power of the output shaft 86 of the rear axle case 23 is changed to the leveling transmission shaft. The input signal is transmitted to the input shaft 77 of the leveling input unit 29 via 71.

  Thus, the drive shaft 34 is driven to rotate in the counterclockwise direction in FIG. The ground surface 35 is leveled by the terrain body 35 when the terrain body 35 is rotated and driven integrally with the drive shaft 34. Even if the mud is blown backward by the terrain body 35, the blown mud is removed. It is stopped by the cover 36.

  As shown in FIG. 2, in the grading device 26, the terrain body 35 is not provided at the shaft support 30, but the side float 53 is located behind the shaft support 30. In the passage portion of the shaft support 30, the side float 53 flattens the unevenness of the rice field surface G.

  In the leveling device 26, the leveling body 35 is not provided in the portion of the spacer 37, but the center float 9 is located behind the spacer 37. In the passing portion of the spacer 37, the unevenness of the rice field G is leveled by the center float 9.

  As described above (structure on the rear axle case side in the transmission system to the leveling device), when the leveling clutch 62 is operated to the disengaged position, the rear axle case 23 moves from the input shaft 45 to the output shaft 86. The transmission of power is cut off, and the leveling device 26 (drive shaft 34) stops.

  The bosses 23a and 23b of the rear axle case 23, the output case 85, and the output shaft 86 are arranged on the right side in plan view with respect to the left and right center line CL of the machine body 11 (the seedling planting apparatus 5). The input shaft 77 of the leveling input unit 29 is disposed on the left side in plan view with respect to the left and right center line CL. The leveling transmission shaft 71 connected between the output shaft 86 and the input shaft 77 is disposed so as to obliquely intersect the left and right center line CL in plan view.

  The transmission shaft 25 (see FIG. 1) to the seedling planting device 5 is disposed at the position of the left and right center line CL so as to overlap the left and right center line CL in plan view, and the rear axle case 23 and the leveling transmission shaft 71. It is arranged above.

(Configuration of the control system of the leveling device)
As shown in FIG. 10, a set depth setting unit 67 and a leveling setting operation unit 68 are provided in the seedling planting apparatus 5, and operation signals of the setting depth setting unit 67 and the leveling setting operation unit 68 are transmitted to the control device. 40 has been entered. The terrain setting operation section 68 is a push button type that is manually pushed, and the set depth setting section 67 is a dial switch type that is manually rotated.

  An operation position sensor 83 for detecting a support position (set height H1) of the center float 9 with respect to the seedling planting device 5 by detecting an operation position of the planting depth lever 56 is provided. Has been input to the control device 40.

  As shown in FIGS. 6, 7, and 10, a leveling position sensor 84 that detects the support position of the leveling device 26 with respect to the seedling planting device 5 by detecting the angle of the upper link 61 of the left support mechanism 72 is provided. The detection value of the terrain position sensor 84 is input to the control device 40. The leveling control unit 110 is provided in the control device 40 as software.

(Elevation control of leveling equipment)
As shown in FIG. 10, based on the operation signals of the set depth setting unit 67 and the leveling setting operation unit 68, and the detection values of the operation position sensor 83 and the leveling position sensor 84, the control device 40 (leveling control unit 110) performs the following. As described in the above, the electric motor 33 is operated and the leveling device 26 is moved up and down.

  A work position where the leveling device 26 touches the rice field G and a retreat position where the leveling device 26 rises significantly from the rice field G are set. In a state where the leveling device 26 is located at the evacuation position, when the leveling setting operation unit 68 is pressed, the leveling device 26 is lowered to the work position. In a state where the leveling device 26 is located at the work position, when the leveling setting operation unit 68 is pressed, the leveling device 26 is raised to the retreat position.

In the state where the leveling device 26 is located at the work position, the leveling of the field surface G is performed by slightly rotating the leveling body 35 of the leveling device 26 into the field surface G.
The set height H1 is detected by the operation position sensor 83, and the support position of the leveling device 26 with respect to the seedling planting device 5 is detected by the leveling position sensor 84, whereby the height of the leveling device 26 relative to the rice field surface G is detected. That is, the leveling depth A1 at which the leveling body 35 of the leveling device 26 enters the rice field G is detected.

  By operating the set depth setting section 67, the set leveling depth can be set and changed. As described above, when the leveling depth A1 of the leveling device 26 is detected, the leveling device 26 is moved up and down so that the leveling depth A1 of the leveling device 26 becomes the set leveling depth.

  Since the leveling device 26 is supported by the seedling planting device 5 (the support frame 12), the planting depth is set as described in the above (elevation control of the seedling planting device) (support structure of the height sensor). When the set height H1 (planting depth of the seedlings by the planting arm 8 (set planting depth)) is changed by the lever 56, the leveling depth A1 of the leveling device 26 changes.

  When the set height H1 is reduced by the planting depth lever 56 (when the planting depth by the planting arm 8 (set planting depth) is increased), the leveling device 26 is reduced by the set height H1. The raising operation is performed on the seedling planting device 5. Thereby, the leveling depth A1 of the leveling device 26 is maintained at the set leveling depth.

  When the set height H1 is increased by the planting depth lever 56 (when the planting depth by the planting arm 8 (set planting depth) is reduced), the leveling device 26 is increased by the amount corresponding to the increase in the set height H1. The descending operation is performed on the seedling planting device 5. Thereby, the leveling depth A1 of the leveling device 26 is maintained at the set leveling depth.

(First Embodiment of the Invention)
As shown in FIG. 11, in the leveling device 26, a disk member 103 having an outer diameter larger than the leveling body 35 may be attached to the drive shaft 34 so as to be located in front of the planting arm 8.

  Accordingly, as the airframe 11 advances, foreign matters such as straws floating on the rice field G can be pushed downward from the rice field G by the disk member 103, and the center float 9 and the side floats 53 and 54 can be pushed. In addition, it is possible to prevent foreign substances from being entangled with the planting arm 8. At the same time, it is possible to prevent the contaminants from wrapping around the ground preparation 35.

(Second Alternative Embodiment of the Invention)
The leveling device 26 may be configured such that the right drive shaft 34 and the leveling body 35 and the left drive shaft 34 and the leveling body 35 can be moved up and down independently of each other with respect to the left and right center line CL. .

  Accordingly, when the next planting process is performed along the seedlings planted on the rice field G in the previous planting process, the drive shaft 34 and the terrain body 35 on the previous planting process are raised to the evacuation position. I can put it.

  As the body 11 advances, mud waves may be generated laterally and outwardly from the right and left ends of the ground leveling device 26. As described above, the drive shaft 34 and the ground leveling body on the previous planting stroke side are used as described above. By raising 35 to the evacuation position, it is possible to suppress the state in which mud waves from the leveling device 26 reach the seedlings planted on the rice field G in the previous planting process.

(Third alternative embodiment of the invention)
In the rolling frame 28, the support arm 28b may be omitted, and right and left support mechanisms 72 may be provided on the right and left portions of the rolling frame 28 in a forward direction to support the leveling device 26. .

(Fourth embodiment of the invention)
In the leveling device 26, the leveling input unit 29 may be attached to a central portion between the right and left support mechanisms 72 on the drive shaft 34, and a right portion between the right and left support mechanisms 72 on the drive shaft 34. It may be attached to.

When the leveling input unit 29 is attached to the right portion of the drive shaft 34 between the right and left support mechanisms 72, the leveling input unit 29, the bosses 23a and 23b of the rear axle case 23, the output case 85, and the output shaft 86 And the leveling transmission shaft 71 are arranged on the same right side with respect to the left and right center line CL in plan view.
In this case, the boss portions 23a and 23b of the rear axle case 23, the output case 85, and the output shaft 86 may be disposed on the left side with respect to the left and right center line CL in plan view.

(Fifth alternative embodiment of the invention)
Instead of providing the second rolling support 52 with the rolling restricting portion 52d, the rolling restricting portion 52d may be provided on an arm (not shown) extending rightward and leftward from the support member 27.

  Instead of providing the yaw regulating portion 52e on the second rolling support portion 52, an arm portion (not shown) extending rightward and leftward from the support member 27, and a rightward portion from the second rolling support portion 52 on the support frame 12 are provided. Further, a yaw regulating portion 52e may be provided at a portion separated to the left.

(Sixth alternative embodiment of the invention)
The support members 16 and 27 may be eliminated, and the second rolling support portion 52 may be attached to the seedling plant 5. In this case, the second rolling support portion 52 may be attached to the support frame 12.

  Instead of the output shaft 86 supported by the rear axle case 23, an output shaft (not shown) extending from the transmission case 17 to the rear part of the fuselage 11 is provided. The leveling transmission shaft 71 may be connected to the input shaft 77.

  The present invention is not limited to a riding type rice transplanter, but also a riding type seeder in which a seeding device (not shown) for supplying seeds (corresponding to agricultural materials) to a rice field G (corresponding to a working device) is supported at the rear of the machine body 11. The present invention can also be applied to a paddy field working machine that supports a supply device (not shown) (corresponding to a working device) for supplying fertilizers and chemicals (corresponding to agricultural materials) to the rice field G at the rear of the machine body 11. .

2 Rear wheel 3 Link mechanism 5 Seedling plant (working device)
Reference Signs List 11 fuselage 26 leveling device 28 rolling frame 34 drive shaft 35 leveling body 51 first rolling support section 52 second rolling support section 52d rolling regulation section 52e yawing regulation section 72 support mechanism 73 auxiliary wheel 75 interlocking member 95 inclination sensor 97 rolling mechanism 109 Rolling controller G Field surface K1 Movement locus P11 First axis center P12 Second axis center

Claims (10)

A working device that is supported by the rear of the aircraft and supplies agricultural materials to the rice field;
A leveling device that is supported between the aircraft and the working device and that levels a field is provided,
The ground leveling device has a drive shaft arranged along the left and right direction, and a ground leveling body that is mounted on the drive shaft and that is grounded by rotating integrally with the drive shaft to level a rice field,
A first rolling support portion that supports the working device so as to freely roll around a first axis in the front-rear direction;
A second rolling support portion that supports the terrain device in a freely rolling manner around a second axial center in the front-rear direction,
A paddy working machine provided with a rolling restricting portion for restricting a rolling operation of the leveling device with respect to the second rolling support portion to a predetermined range set in advance.   The paddy working machine according to claim 1, wherein the rolling restricting portion is provided on the second rolling support portion.   3. The paddy field working machine according to claim 1, further comprising a yawing regulating unit that regulates a yawing operation of the ground control device around the vertical axis with respect to the second rolling support unit. 4.   The paddy field working machine according to claim 3, wherein the yawing restricting section is provided on the second rolling support section. A link mechanism that is supported at the rear of the body so as to be able to move up and down and that extends rearward is provided.
The said 1st rolling support part and the said 2nd rolling support part are provided in the rear part of the said link mechanism, The said working apparatus and the said leveling device are supported by the rear part of the said link mechanism. Paddy field working machine according to any one of the preceding claims. A rolling mechanism that performs a rolling operation of the working device with respect to the link mechanism;
An inclination sensor that detects an inclination angle in the left-right direction with respect to a horizontal plane of the working device,
The paddy working machine according to claim 5, further comprising: a rolling control unit that activates the rolling mechanism such that a detection value of the tilt sensor has a preset tilt angle.   When the inclination angle difference between the inclination angle with respect to the horizontal plane due to the rolling operation of the working device and the inclination angle with respect to the horizontal surface due to the rolling operation of the ground leveling device is going to be larger than a preset angle difference, the working device of the working device 7. The interlocking member that transmits a rolling operation to the leveling device to prevent the inclination angle difference from becoming larger than the set angle difference, is connected across the working device and the leveling device. Paddy working machine as described. The second rolling support is disposed on the rear side of the leveling device,
A rolling frame that is rotatably supported around the second axis by the second rolling support portion and that passes through an upper side of the leveling device and extends to a front side of the leveling device;
A supporting mechanism attached to an extending portion of the rolling frame and extending rearward, the supporting mechanism rotatably supporting the drive shaft,
The paddy field working machine according to any one of claims 5 to 7, wherein the leveling device is rotatably supported by the second rolling support portion.   9. The paddy field working machine according to claim 8, wherein a movement trajectory of the extending portion of the rolling frame due to a lifting operation of the link mechanism overlaps with a rear wheel of the body in a side view. 10. An auxiliary wheel mounted concentrically with the rear wheel is provided,
The paddy working machine according to claim 9, wherein the movement trajectory is disposed between the rear wheel and the auxiliary wheel in a plan view.

Images