Technical Field
[0001]
The present invention relates to a paddy field work machine that includes a soil
preparation device including a soil preparation rotor that is located forward of a seedling
planting device and is drivingly rotated about a rotation axis extending in a left-right
10 lateral direction.
Background Art
[0002]
Conventionally known paddy field work machines that include a soil preparation
15 device including a soil preparation rotor located forward of a seedling planting device are
configured as described below.
The soil preparation device is located on the front portion of the seedling planting
device. Rotational power is input to one end of a drive shaft of the soil preparation rotor
from a drive system of the seedling planting device. An agricultural field is prepared
20 before seedlings are planted by the seedling planting device by the rotation of the soil
preparation rotor (refer to Patent Literature 1).
Citation List
Patent Literature
25 [0003]
Patent Literature 1
Japanese Unexamined Patent Application Publication, Kokai, No. 2017-35034
Summary of Invention
30 Technical Problem
[0004]
The paddy field work machine disclosed in Patent Literature 1 is useful in that
the soil preparation rotor is located on the front portion of the seedling planting device,
allowing the agricultural field to be prepared before planting seedlings.
35 Unfortunately, with this configuration, when the seedling planting device with a
large number of planting rows is employed, and the seedling planting device is configured
to be divisible and foldable for storage and transport, the soil preparation rotor that cannot
3
be divided or folded needs to be removed, which leaves room for improvement.
[0005]
The present invention aims at providing a paddy field work machine that allows
a soil preparation rotor to be divided while being kept attached to a seedling planting
5 device.
Solution to Problem
[0006]
A paddy field work machine of the present invention includes a seedling planting
device and a soil preparation rotor. The seedling planting device is coupled to be
10 supported by a back portion of a travel machine body through a lifting and lowering link
mechanism. The soil preparation rotor is located forward of the seedling planting device
and is configured to be drivingly rotated about a rotation axis extending in a left-right
lateral direction. The seedling planting device is divisible into left and right seedling
planting units. Each of the seedling planting units is configured by a combination of: a
15 plurality of seedling loading sections arranged one next to another in a line in the leftright direction; a plurality of seedling planting mechanisms arranged corresponding to the
seedling loading sections; and a planting frame, which supports the seedling loading
sections and the seedling planting mechanisms. The seedling planting units are coupled
to the lifting and lowering link mechanism. The soil preparation rotor includes a central
20 rotary portion, which is located at a central portion in the left-right direction, and left and
right end rotary portions on opposite lateral sides of the central rotary portion along the
rotation axis. The left and right end rotary portions are separable from the central rotary
portion. The central rotary portion is supported by the lifting and lowering link
mechanism. The left and right end rotary portions are supported respectively by the left
25 and right seedling planting units.
[0007]
According to the present invention, the soil preparation rotor is configured in
such a manner that the left and right end rotary portions are separable from the central
rotary portion. The central rotary portion is supported by the lifting and lowering link
30 mechanism, and the left and right end rotary portions are supported respectively by the
left and right seedling planting units.
Thus, even when the left and right end rotary portions are separated from the
central rotary portion, the central rotary portion is supported by the lifting and lowering
link mechanism, and the left and right end rotary portions are supported respectively by
35 the left and right seedling planting units, which allows the left and right end rotary
portions to be separated from the central rotary portion while the left and right end rotary
portions are kept attached to the seedling planting device.
4
In this way, since the soil preparation rotor does not need to be detached or
attached and can be divided while being kept supported by the seedling planting device,
the paddy field work machine is stored or transported conveniently.
[0008]
5 In the present invention, the seedling planting units may preferably be coupled
to the lifting and lowering link mechanism through a foldable mechanism. The foldable
mechanism includes a central frame, which is supported by the lifting and lowering link
mechanism, a right end frame, which is coupled to a right end portion of the central frame
to be rotatable about a vertical axis relative to the central frame, and a left end frame,
10 which is coupled to a left end portion of the central frame to be rotatable about a vertical
axis relative to the central frame. The respective planting frames of the left and right
seedling planting units are supported by respective end portions of the left and right end
frames opposite to the respective end portions thereof coupled to the central frame in such
a manner as to be each swingable relative to the corresponding end frame about a vertical
15 axis parallel to the respective vertical axes for left and right end portions of the central
frame.
[0009]
With the present configuration, the soil preparation rotor can be folded while
being kept supported by the seedling planting device utilizing the structure in which the
20 seedling planting device is foldable with a foldable mechanism.
That is, the section that can be divided into three parts, namely, the central frame
and the left and right seedling planting units, which are the folding feature of the seedling
planting device, is configured so that the left and right seedling planting unit portions are
foldable with respect to the central frame portion, which is supported by the lifting and
25 lowering link mechanism. The soil preparation rotor is also configured to be divided into
three parts including the central rotary portion and the end rotary portions on both sides
of the central rotary portion.
As a result, the soil preparation rotor is folded in accordance with the folding
operation of the seedling planting device while being kept supported by the seedling
30 planting device.
In this way, the soil preparation rotor does not need to be detached or attached
and can also be folded while being kept supported by the seedling planting device. This
improves the ease of handling in storing or transporting the foldable paddy field work
machine.
35 [0010]
In the present invention, the paddy field work machine may preferably further
include a central drive shaft, which supports the central rotary portion, and end rotary
5
shafts, which support the respective left and right end rotary portions. The end rotary
shafts are detachably coupled to the central drive shaft through an engageable and
disengageable clutch mechanism. The central drive shaft is supported by the central frame
through a hanging link mechanism in such a manner as to be capable of being lifted and
5 lowered. The left and right end rotary shafts are supported by the respective left and right
seedling planting units each with another hanging link mechanisms in such a manner as
to be capable of being lifted and lowered. The central drive shaft is configured to receive
power from the travel machine body, and an actuator that is configured to lift and lower
the hanging link mechanism of the central drive shaft is mounted on the central frame.
10 [0011]
With the present configuration, the central drive shaft of the central rotary
portion is supported by the central frame through the hanging link mechanism, and the
end rotary shafts of the respective left and right end rotary portions are supported by the
left and right seedling planting units through other hanging link mechanisms. The end
15 rotary shafts and the central drive shaft are detachably coupled to each other with the
engageable and disengageable clutch mechanism. Additionally, the actuator that lifts and
lowers the hanging link mechanism of the central drive shaft is mounted on the central
frame.
Thus, when the clutch mechanism disengages the end rotary shafts from the
20 central drive shaft, the end rotary shafts and the end rotary portion are kept hanging from
the left and right seedling planting unit portions through other hanging link mechanisms
although rotational power or hanging power of the actuator are not transmitted.
Thus, the soil preparation rotor does not need to be detached or attached and can
be easily folded while being kept hanging to be supported by the seedling planting device
25 by, for example, appropriately adjusting the height of the central drive shaft using the
actuator. This further improves the ease of handling in storing or transporting the foldable
paddy field work machine.
[0012]
In the present invention, the end rotary portions may preferably be movable
30 toward below the central rotary portion with the end rotary shafts are disengaged from
the central drive shaft by the clutch mechanism.
[0013]
With the present configuration, since the end rotary portions are movable toward
below the central rotary portion, the end rotary portions are allowed to slide under the
35 central rotary portion to be folded in a compact manner.
[0014]
In the present invention, the seedling planting units may preferably include a soil
6
preparation float. The end rotary portions are movable toward below the soil preparation
float with the end rotary shafts disengaged from the central drive shaft by the clutch
mechanism.
[0015]
5 With the present configuration, since the end rotary portions are movable toward
below the soil preparation float, the end rotary portions are allowed to be folded in a
compact manner without the need for moving the end rotary portions in a front-back
direction to avoid interference with the soil preparation float in the horizontal direction.
[0016]
10 In the present invention, the central rotary portion may preferably be movable
toward above the end rotary portions with the end rotary shafts disengaged from the
central drive shaft by the clutch mechanism.
[0017]
With the present configuration, since the central rotary portion is movable toward
15 above the end rotary portions, the central rotary portion is allowed to be folded in a
compact manner by lifting the central rotary portion with ease using the actuator that lifts
and lowers the hanging link mechanism of the central rotary portion and moving the
central rotary portion over the end rotary portions.
[0018]
20 In the present invention, the clutch mechanism may preferably be configured to
connect and disconnect the end rotary shafts and the central drive shaft in accordance
with a change in an orientation of the end rotary portions with respect to the central rotary
portion. The clutch mechanism connects the end rotary shafts and the central drive shaft
when rotation axes of the end rotary portions are oriented along a rotation axis of the
25 central rotary portion and disconnects when the respective rotation axes of the end rotary
portions are moved away from the rotation axis of the central rotary portion.
[0019]
With the present configuration, the clutch mechanism connects or disconnects
the end rotary shafts and the central drive shaft in accordance with the change in the
30 orientation of the end rotary portions with respect to the central rotary portion. This
further facilitates the folding operation.
[0020]
In the present invention, the seedling planting device may preferably be for 10-
row planting and include the seedling loading sections for 10 rows.
35 [0021]
The present configuration facilitates the folding operation of the soil preparation
rotor in accordance with the folding of the large seedling planting device including the
7
seedling loading sections for 10 rows.
Brief Description of Drawings
[0022]
5 Fig. 1 is an overall side view of a riding-type rice transplanter.
Fig. 2 is an overall plan view of the riding-type rice transplanter.
Fig. 3 is a diagram of a foldable structure in a plan view illustrating the state in
which a seedling planting device is in an in-operation state.
Fig. 4 is a plan view of the foldable structure in a top view illustrating the state
10 in which the seedling planting device is in a folded state.
Fig. 5 is a front view of the seedling planting device illustrating how a soil
preparation device is supported by the seedling planting device.
Fig. 6 is an exploded perspective view of the structure for supporting an end
rotary portion of a soil preparation rotor.
15 Fig. 7 is a side view of the structure for supporting a central rotary portion of the
soil preparation rotor.
Fig. 8 is a side view of the structure for supporting the central rotary portion of
the soil preparation rotor.
Fig. 9 is a side view of the end rotary portion of the soil preparation rotor
20 illustrating a lowered state and a lifted state.
Fig. 10 is a front view of the central rotary portion and the end rotary portion of
the soil preparation rotor illustrating the lowered state and the lifted state.
Fig. 11 is a front view of the central rotary portion and the end rotary portion of
the soil preparation rotor illustrating the state in which the seedling planting device is
25 folded.
Description of Embodiments
[0023]
Hereinafter, an embodiment of the present invention will be described with
30 reference to the drawings.
A front-back direction and a left-right direction in the description of the present
embodiment are illustrated as follows unless otherwise specified. That is, in a paddy field
work machine to which the present invention is applied, a forward traveling direction
(refer to arrow F in Figs. 1 and 2) of the travel machine body during work travel is referred
35 to as the “front”, and a backward traveling direction (refer to arrow B in Figs. 1 and 2) is
referred to as the “back”. A direction corresponding to the right (refer to arrow R in Fig.
2) with the paddy field work machine facing the front in the front-back direction is
8
referred to as the “right”, and, similarly, a direction corresponding to the left (refer to
arrow L in Fig. 2) is referred to as the “left”.
[0024]
[General Arrangement of Paddy Field Work Machine]
5 Fig. 1 is an overall side view of the paddy field work machine according to the
present invention. The paddy field work machine is a riding-type rice transplanter in this
embodiment. Fig. 2 is an overall plan view of the riding-type rice transplanter.
As shown in Figs. 1 and 2, the riding-type rice transplanter includes a travel
machine body 1, a pair of left and right steerable front wheels 1F, which are located at the
10 front portion of the travel machine body 1, and a pair of left and right driving wheels,
which are rear wheels 1R in this embodiment. The rear wheels 1R are located at the back
portion of the travel machine body 1. The riding-type rice transplanter is self-propelled.
The rear wheels 1R receive power transmitted from an engine 20 provided in a
motor section 2 at the front portion of the machine body. The power of the engine 20 is
15 also transmitted to a later-described fertilizer applicator 4 mounted on the back portion of
the travel machine body 1 and a groundwork device, which is a seedling planting device
6 in this embodiment. The seedling planting device 6 is coupled to the back portion of a
body frame 10 of the travel machine body 1 through a lifting and lowering link
mechanism 11 that is vertically swingable. A soil preparation device 5 including a soil
20 preparation rotor 50 is located forward of the seedling planting device 6. The soil
preparation rotor 50 is drivingly rotated about a rotation axis x1 extending in a left-right
lateral direction.
[0025]
The travel machine body 1 includes a driver section 3 rearward of the motor
25 section 2. The driver section 3 includes a driver floor 30, a steering section 31 on the front
portion of the driver floor 30, and a driver’s seat 32 on the back portion of the driver floor
30. The steering section 31 includes, for example, a steering wheel 31a. This
configuration allows a driver to get on the driver section 3 and operate the steering wheel
31a. A footboard 35 used for getting on and off the rice transplanter from and to the ground
30 is located below the side edges of the driver floor 30.
[0026]
As shown in Fig. 2, side floors 22 are located on both sides of an engine hood
21, which houses the engine 20 in the motor section 2. The side floors 22 are coupled to
the front portion of the driver floor 30. A driver is allowed to get on and off from the front
35 portion of the machine body using the side floors 22.
As shown in Figs. 1 and 2, spare seedling trays 12 are located on the outer sides
of the left and right side floors 22 at the front portion of the travel machine body 1.
9
Markers 24 are located on both sides of the front portion of the travel machine
body 1. In Figs. 1 and 2, the markers 24 are supported in a storage orientation in which
the markers 24 extend in the front-back direction of the travel machine body 1 and are
bent upward. When the markers 24 are used to mark lines on an agricultural field as
5 reference for traveling, the distal end portions that have been bent upward are brought to
a horizontal orientation and further brought to an orientation extending laterally outward
of the travel machine body 1.
[0027]
As shown in Fig. 2, the driver floor 30 is formed so that the width of the portion
10 of the driver floor 30 forward of the driver’s seat 32 in the left-right direction is not
constant, and the width differs between the front portion and the back portion. That is, the
lateral width of the driver floor 30 at a rearward position closer to the driver’s seat 32 is
wider than the lateral width of the driver floor 30 at a forward position further from the
driver’s seat 32. Thus, a narrow portion 33 where the lateral width is a little narrow exists
15 at the forward position further from the driver’s seat 32, and a wide portion 34 where the
lateral width is wider than the narrow portion 33 exists at the rearward position closer to
the driver’s seat 32.
More specifically, the lateral width of the narrow portion 33 is approximately the
same as or a little wider than the distance between the outermost edges of the side floors
20 22 located on both sides of the motor section 2. The wide portion 34 is wider than the
narrow portion 33, wider than the lateral width of a hopper 40 of the fertilizer applicator
4 located behind the driver’s seat 32, and is set to a width not exceeding the lateral width
of a seedling tray 60 of the seedling planting device 6. The seedling tray 60 includes 10
rows of seedling loading sections 60a.
25 [0028]
The riding-type rice transplanter includes the fertilizer applicator 4, which is an
example of an agricultural material supplying device.
The fertilizer applicator 4 includes the hopper 4, which stores powder fertilizer,
which is an example of agricultural material, a feeder 41, which feeds the stored fertilizer
30 from the hopper 40 by a predetermined amount, a conveying hose 42, which conveys the
fertilizer that has been fed, and a ditching machine 43, which is a ground supply section
guiding the supplied fertilizer to the agricultural field.
The hopper 40 includes five containers each including an accommodation space
for the powder fertilizer and arranged in line in the left-right direction. The hopper 40 is
35 located behind the driver’s seat 32 on the rear end portion of the travel machine body 1.
[0029]
[Seedling Planting Device]
10
As shown in Figs. 1 and 2, the seedling planting device 6, which is an example
of the ground work device, is coupled to the rear end portion of the lifting and lowering
link mechanism 11.
The front end portion of a planting frame 61 of the seedling planting device 6 is
5 coupled to the rear end portion of the lifting and lowering link mechanism 11. The
seedling planting device 6 includes ten seedling planting mechanisms 62 mounted on the
back portion of the planting frame 61 to be arranged in a line in the lateral direction of
the travel machine body, the seedling tray 60 located above the planting frame 61, and
five ground-contacting floats 63 mounted on the lower portion of the planting frame 61
10 to be arranged one next to another in the lateral direction of the travel machine body. This
configures the seedling planting device 6 for 10-row planting.
[0030]
The seedling tray 60 includes ten seedling loading sections 60a arranged one
next to another in the lateral direction of the travel machine body and configured to allow
15 seedling mats to be loaded. The seedling tray 60 is supported by a seedling tray support
frame 65 vertically located on the planting frame 61. The front side of the seedling tray
60 corresponding to the back sides of the seedling loading sections 60a is supported in
such a manner that the seedling tray 60 is reciprocally movable in the lateral direction of
the machine body. The seedling tray 60 reciprocates in conjunction with the seedling
20 planting operation of the seedling planting mechanisms 62 and supplies the seedling
planting mechanisms 62 with seedlings from the seedling loading sections 60a.
Engine power is transmitted to the seedling planting device 6 from the travel
machine body 1 through a planting drive shaft 13. A chemical sprayer 64 is mounted on
the back portion of the seedling planting device 6. The chemical sprayer 64 sprays a
25 chemical agent onto the agricultural field after seedlings have been planted.
[0031]
The ground-contacting floats 63 come into contact with the agricultural field
surface when the seedling planting device 6 is lowered in the in-operation state. The
ground-contacting floats 63 support the seedling planting device 6 so that the seedling
30 planting depth of the seedling planting mechanisms 62 will be a predetermined depth and
prepare the immediate positions where the seedlings will be planted by the seedling
planting mechanisms 62.
The ditching machine 43 is mounted on each ground-contacting float 63. The
ditching machine 43 cuts a channel into the mud surface for guiding and embedding
35 fertilizer supplied from the fertilizer applicator 4.
[0032]
The seedling planting device 6 includes seedling planting units 6L and 6R
11
located on the left side and the right side in the left-right direction. The seedling planting
units 6L and 6R are each configured by a combination of the plurality of seedling loading
sections 60a arranged one next to another in a line in the left-right direction, the plurality
of seedling planting mechanisms 62 arranged corresponding to the seedling loading
5 sections 60a, and the planting frame 61, which supports the seedling loading sections 60a
and the seedling planting mechanisms 62.
The seedling planting units 6L and 6R are coupled to the lifting and lowering
link mechanism 11 through a foldable mechanism 7.
[0033]
10 As shown in Figs. 3 and 4, the foldable mechanism 7 includes a central frame
70C, which is supported by the lifting and lowering link mechanism 11, a right end frame
70R, which is coupled to the right end portion of the central frame 70C to be rotatable
about a vertical axis y1 relative to the central frame 70C, and a left end frame 70L, which
is coupled to the left end portion of the central frame 70C to be rotatable about a vertical
15 axis y2 relative to the central frame 70C.
The planting frame 61 of the right seedling planting unit 6R is supported by the
end of the right end frame 70R opposite to the end coupled to the central frame 70C in
such a manner as to be rotatable relative to the right end frame 70R about a vertical axis
y3. The planting frame 61 of the left seedling planting unit 6L is supported by the end of
20 the left end frame 70L opposite to the end coupled to the central frame 70C in such a
manner as to be rotatable relative to the left end frame 70L about a vertical axis y4. The
vertical axes y3 and y4 are parallel to the vertical axes y1 and y2.
[0034]
[Soil Preparation Device]
25 The soil preparation device 5 located forward of the seedling planting device 6
will be described.
The soil preparation device 5 is used to level off unevenness and clods on the
mud surface at the position forward of the ground-contacting floats 63 of the seedling
planting device 6 in the traveling direction. The soil preparation device 5 includes the soil
30 preparation rotor 50, which is drivingly rotated about the rotation axis x1 extending in the
left-right lateral direction, a soil preparation transmission shaft 14, which transmits power
to the soil preparation rotor 50, and a lifting and lowering mechanism 54, which changes
the height of the soil preparation rotor 50 from the ground.
[0035]
35 The soil preparation rotor 50 includes a central rotary portion 50C, which is
located at the central portion in the left-right direction, and left and right end rotary
portions 50L and 50R on opposite lateral sides of the central rotary portion 50C along the
12
rotation axis x1. The soil preparation transmission shaft 14, which extends from the travel
machine body 1, is connected to the central rotary portion 50C, so that the power of the
engine 20 is transmitted to the central rotary portion 50C.
[0036]
5 As shown in Figs. 6, 10, and 11, the central rotary portion 50C includes a central
drive shaft 51C, which supports the central rotary portion 50C. The end rotary portions
50L and 50R include end rotary shafts 51L and 51R, which support the respective left and
right end rotary portions 50L and 50R.
The central drive shaft 51C and the end rotary shafts 51L and 51R are square
10 shafts having a rectangular cross-section that is approximately square. Multiple soil
preparation rotating bodies 52 made of synthetic resin and including a square fitting hole
52a are fitted to the central drive shaft 51C and the end rotary shafts 51L and 51R, which
are square shafts. With this configuration, the central drive shaft 51C and the central
rotary portion 50C are integrally rotatable, and the left and right end rotary portions 50L
15 and 50R are respectively fitted to the end rotary shafts 51L and 51R to be integrally
rotatable.
[0037]
The soil preparation transmission shaft 14 and the central drive shaft 51C are
interlocked through a non-illustrated bevel gear transmission mechanism. The central
20 drive shaft 51C and the end rotary shafts 51L and 51R are selectively connected and
disconnected by relative movement in the axial direction using dog clutches 53 mounted
on the shaft end portions of the central drive shaft 51C and the end rotary shafts 51L and
51R. This switches between a power transmission state and a disconnected state.
Since the soil preparation rotor 50 does not receive a large drive load such as that
25 received when travel wheels are driven, the meshing pattern of the dog clutches 53 on the
central drive shaft 51C and the end rotary shafts 51L and 51R is set relatively shallow.
Thus, when the foldable mechanism 7 causes the right end frame 70R and the left end
frame 70L to rotate about the vertical axes y1 and y2 with respect to the central frame
70C to be brought into a folded storage orientation, the dog clutches 53 are changed from
30 an engaged state to a disengaged state in conjunction with this movement. Thus, the
power transmission from the central drive shaft 51C to the end rotary shafts 51L and 51R
is disconnected.

Claims:
Claim 1
A paddy field work machine comprising:
a seedling planting device coupled to be supported by a back portion of a travel
5 machine body through a lifting and lowering link mechanism; and
a soil preparation rotor located forward of the seedling planting device and
configured to be drivingly rotated about a rotation axis extending in a left-right lateral
direction, wherein
the seedling planting device is divisible into left and right seedling planting units
10 and each of the seedling planting units is configured by a combination of:
a plurality of seedling loading sections arranged one next to another in
a line in the left-right direction;
a plurality of seedling planting mechanisms arranged corresponding to
the seedling loading sections; and
15 a planting frame, which supports the seedling loading sections and the
seedling planting mechanisms,
the seedling planting units are coupled to the lifting and lowering link
mechanism,
the soil preparation rotor includes:
20 a central rotary portion, which is located at a central portion in the leftright direction; and
left and right end rotary portions on opposite lateral sides of the central
rotary portion along the rotation axis,
the left and right end rotary portions are separable from the central rotary portion,
25 the central rotary portion is supported by the lifting and lowering link mechanism,
and
the left and right end rotary portions are supported respectively by the left and
right seedling planting units.
30 Claim 2
The paddy field work machine according to claim 1, wherein
the seedling planting units are coupled to the lifting and lowering link
mechanism through a foldable mechanism,
the foldable mechanism includes:
35 a central frame, which is supported by the lifting and lowering link
mechanism;
a right end frame, which is coupled to a right end portion of the central
19
frame to be rotatable about a vertical axis relative to the central frame; and
a left end frame, which is coupled to a left end portion of the central
frame to be rotatable about a vertical axis relative to the central frame, and
the respective planting frames of the left and right seedling planting units are
5 supported by respective end portions of the left and right end frames opposite to the
respective end portions thereof coupled to the central frame in such a manner as to be
each swingable relative to the corresponding end frame about a vertical axis parallel to
the respective vertical axes for left and right end portions of the central frame.
10 Claim 3
The paddy field work machine according to claim 2, further comprising:
a central drive shaft, which supports the central rotary portion; and
end rotary shafts, which support the respective left and right end rotary portions,
wherein
15 the end rotary shafts are detachably coupled to the central drive shaft through an
engageable and disengageable clutch mechanism,
the central drive shaft is supported by the central frame through a hanging link
mechanism in such a manner as to be capable of being lifted and lowered,
the left and right end rotary shafts are supported by the respective left and right
20 seedling planting units each with another hanging link mechanisms in such a manner as
to be capable of being lifted and lowered,
the central drive shaft is configured to receive power from the travel machine
body, and
an actuator that is configured to lift and lower the hanging link mechanism of the
25 central drive shaft is mounted on the central frame.
Claim 4
The paddy field work machine according to claim 3, wherein
the end rotary portions are movable toward below the central rotary portion with
30 the end rotary shafts disengaged from the central drive shaft by the clutch mechanism.
Claim 5
The paddy field work machine according to claim 3 or 4, wherein
the seedling planting units include a soil preparation float, and
35 the end rotary portions are movable toward below the soil preparation float with
the end rotary shafts disengaged from the central drive shaft by the clutch mechanism.
20
Claim 6
The paddy field work machine according to claim 3, wherein
the central rotary portion is movable toward above the end rotary portions with
the end rotary shafts disengaged from the central drive shaft by the clutch mechanism.
5
Claim 7
The paddy field work machine according to any one of claims 3 to 6, wherein
the clutch mechanism is configured to connect and disconnect the end rotary
shafts and the central drive shaft in accordance with a change in an orientation of the end
10 rotary portions with respect to the central rotary portion such that the clutch mechanism
connects the end rotary shafts and the central drive shaft when rotation axes of the end
rotary portions are oriented along a rotation axis of the central rotary portion and
disconnects the end rotary shafts and the central drive shaft when the respective rotation
axes of the end rotary portions are moved away from the rotation axis of the central rotary
15 portion.
Claim 8
The paddy field work machine according to any one of claims 1 to 7, wherein
the seedling planting device is for 10-row planting and includes the seedling
20 loading sections for 10 rows.