WO2001097593A1

WO2001097593A1 - Riding rice planting machine

Info

Publication number: WO2001097593A1
Application number: PCT/JP2000/008971
Authority: WO
Inventors: Toshio Nakao; Tsunatake Yamashita; Koji Miyake
Original assignee: Yanmar Agricultural Equipment Co., Ltd.
Priority date: 2000-06-16
Filing date: 2000-12-19
Publication date: 2001-12-27
Also published as: CN1349378A; JP2002000023A; KR100675474B1; JP4510238B2; KR20020039642A; TW523395B; CN1209004C

Abstract

A riding rice planting machine designed to compactify the planting mechanism, which comprises a pipe frame-like transmission casing composed of a plurality of pipe-like lengthwise extending frames extending in the lengthwise direction, a pipe-like widthwise extending frame extending in the widthwise direction and installed between the front ends of the lengthwise extending frames, a pipe-like rear end frame connected to the rear end of each lengthwise extending frame and extending in the widthwise direction, wherein the front ends of drive shafts each rotatably received in the lengthwise extending frame are interlocked by an interlock shaft rotatably received in the widthwise extending frame, a planting arm shaft rotatably received in the rear end frame is interlocked with the rear end of each drive shaft through a unit clutch, and a planting arm having a planting claw is interlocked with the planting arm shaft, the unit clutch being disposed on the rear end frame.

Description

Specification

Passenger rice transplanter technical field

The present invention relates to a riding rice transplanter, and more particularly to a planting mechanism provided in a planting machine for planting seedlings. Background art

The conventional riding rice transplanter has a planting machine installed at the rear of the traveling machine so as to be able to move up and down via an elevating mechanism.The seedling mounting table and the planting mechanism are arranged at the planting machine, and The seedlings on the nursery stand were planted in the field by the organization.

The planting mechanism is mounted on a cylindrical pipe-shaped support frame that extends in the left-right direction, with an aluminum die-cast transmission chain case that extends in the front-rear direction, spaced apart from side to side. A PTO shaft linked to the prime mover is linked to a link shaft rotatably housed inside the support frame. The link shaft is rotatably housed inside the transmission chain case, extending in the left-right direction. The planting arm shaft is connected to the planting arm shaft via a transmission chain, and the planting arm having a planting claw is connected to the planting arm shaft in an interlocking manner. The unit clutch is interposed, and the transmission chain and the planting arm shaft are connected or disconnected by the unit clutch.

However, in the planting mechanism of the conventional rice transplanter described above, a transmission chain case made of aluminum die-casting is attached to the support frame, and the power is transmitted by the transmission chain arranged inside the transmission chain case. The structure for transmitting power makes the structure of the power transmission path complicated, and the transmission chain case is manufactured from aluminum die-cast The cost was high and the weight was heavy.

For this reason, it has been an issue to simplify the structure of the planting mechanism and reduce its size and weight. Disclosure of the invention

In view of the above, according to the present invention, a planting machine is provided at a rear portion of a traveling machine, and a planting mechanism provided in the planting machine is connected to a prime mover provided in the traveling machine in an interlocking manner. The mechanism consists of a plurality of pipe-shaped front and rear extension frames extending in the front-rear direction, a pipe-shaped left and right extension frame extending between the front ends of the front-rear extension frames, and a rear end of each front-rear extension frame. A pipe frame-shaped transmission casing is formed from a pipe-shaped rear end frame extending in the left-right width direction that is connected to the front and rear parts. In addition to the interlocking connection by interlocking shafts rotatably accommodated in the left and right extension frames, the planting arm shafts rotatably housed in the rear end frame are linked to the rear end of each drive shaft via a unit clutch. Linked The planting arm having a planting claw is connected to the planting arm shaft in an interlocking manner, and the unit clutch is arranged on the rear end frame.

In addition, the unit clutch is used to perform a clutch operation by loosely fitting a transmission gear interlockingly connected with a drive shaft to a planted arm shaft and connecting or disconnecting the transmission gear and the planted arm shaft. The clutch operating body is slidably disposed along the mounting arm axis, and the clutch operating body is allowed to slide only within a predetermined rotation angle range of the clutch operating body, so that the clutch operating body and the transmission gear are mounted. A stop member for stopping the driving of the planting arm with the cutting arm shaft in a disconnected state is arranged near the planting arm shaft.

In addition, the stop member has a rotation angle of the clutch operating body, The sliding of the clutch operating body is allowed only between the rotation angle when it is positioned above and the rotation angle when the planting claws take out the seedlings. In addition, an engagement recess into which the stop member engages only within a predetermined rotation angle range of the clutch operation body is formed in the clutch operating body, and the end of the engaging recess is formed to be inclined. .

In the riding rice transplanter according to the present invention, a planting machine is provided at a rear portion of the traveling machine body, and a planting mechanism for planting seedlings is provided in the planting machine, and the planting mechanism is provided in the traveling machine body. It is linked to the prime mover.

The planting mechanism includes a plurality of pipe-shaped front and rear extension frames extending in the front-rear direction, and a pipe-shaped left and right extension frame extending between the front ends of the front-rear extension frames and extending in the left-right width direction. A pipe-shaped transmission casing is formed from a pipe-shaped rear end frame extending in the left-right width direction and connected to the rear end of the frame.

Therefore, the weight of the planting mechanism can be reduced, and at the same time, the assembling workability is improved and the manufacturing cost can be reduced.

In addition, the front ends of the drive shafts rotatably housed in the respective front and rear extension frames are interlocked and connected by the interlocking shafts rotatably housed in the left and right extension frames, and the rear ends of the drive shafts are connected to the rear ends. The planting arm shaft rotatably housed in the end frame is interlocked and connected via a unit clutch, and the planting arm having a planting claw is connected to the planting arm shaft in an interlocking manner. This makes it possible to simplify the power transmission structure, which also makes it possible to reduce the size and weight of the planting mechanism and reduce the manufacturing cost.

Further, since the unit clutch is disposed on the rear end frame, the workability of unit clutch assembly can be improved. In the unit clutch, specifically, a transmission gear interlockingly connected to the drive shaft is loosely fitted to the planting arm shaft, and the transmission gear and the planting arm shaft are connected or disconnected. A clutch operating body for performing the clutch operation for disengagement is slidably disposed along the axis of the planting arm, and the sliding of the clutch operating body is performed only within a predetermined rotation angle range of the clutch operating body. A stop member for stopping the drive of the planting arm by cutting the transmission gear and the planting arm shaft by allowing movement is provided near the planting arm shaft. .

Therefore, the unit clutch can be made as small as possible.

Moreover, the stop member can be used only when the rotation angle of the clutch operating body is between the rotation angle when the planting claw is positioned above the float and the rotation angle at the position where the planting claw takes out the seedling. Because the operating body is allowed to slide, when the unit clutch is actuated, the tip of the planting claw does not stop with the tip located below the float. This prevents the plant from being damaged by colliding with the road or the road surface, and the planting claw does not stop while holding the seedling, thereby preventing waste of the seedling.

Also, by forming an engagement recess into which the stop member engages only within a predetermined rotation angle range of the clutch operation body, and forming an end of the engagement recess in an inclined shape, The stop member smoothly engages with the engaging concave portion of the rotating clutch operating body, so that the clutch operation of the unit clutch can be smoothly operated. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a left side view showing a riding rice transplanter according to the present invention, FIG. 2 is a plan view showing an airframe, and FIG. 3 is a partially cutaway plan sectional view showing a planting mechanism. FIG. 4 is a sectional view of the same plane, and FIG. FIG. 6 is a plan sectional view showing the switch, FIG. 6 is a rear sectional view of the same part cutaway, FIG. 7 is a plan view of the same, FIG. 8 is a component diagram showing a transmission gear, and FIG. 9 is a clutch. FIG. 10 is a component diagram showing an operating body, and FIG. 10 is a side view showing a locus of a planting claw. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

In the riding rice transplanter 1 according to the present invention, as shown in FIG. 1, a planting machine 3 is connected to a rear part of a traveling body 2 configured to be self-propellable via a lifting mechanism 4 so as to be able to move up and down. .

As shown in FIG. 1, the traveling body 2 has a traveling section 6 arranged at a lower portion of the body frame 5 and a motor section 7 arranged at an upper front portion of the body frame 5, and is located immediately behind the motor section 7. The operation control unit 8 is arranged at the position.

As shown in FIGS. 1 and 2, the body frame 5 extends in the left-right width direction between the front ends of a pair of left and right rectangular main pipes 9, 10 extended in the front-rear direction. A hollow cylindrical front end pipe 11 is erected.

The body frame 5 has a cylindrical engine support pipe 12 extending in the left and right width direction between the front halfway of the main pipes 9 and 10. The center of the engine support pipe 12 An engine support plate 13 extending in the front-rear direction is installed between the engine support pipe 11 and the center of the front end pipe 11, while a pair of left and right transmission support brackets 14, 15 are provided at the center rear of the engine support pipe 12. In addition, the rear part of the main pipes 9 and 10 was formed to have a front-low and rear-high slope, and extended to the rear end of the main pipes 9 and 10 so as to have a front-high and rear-low slope. The front ends of a pair of right and left inclined pipes 16 and 17 with a rectangular cross section are connected in series. And a transmission case 18 extending in the front-rear direction between the transmission support brackets 14 and 15 attached to the engine support pipe 12 and the rear ends of the inclined pipes 16 and 17. It is erected. In the figure, 19 is a gate-shaped seat support pipe erected between the middle portions of the main pipes 9 and 10, and 20 and 21 are extended in the left-right direction in the middle portion of the main pipes 9 and 10. A step support pipe attached in this state, 22 is a pair of left and right weights for adjusting the weight balance before and after the fuselage, 23 is a marker for planting around, and 24 is a center marker.

As shown in FIGS. 1 and 2, the traveling section 6 is formed integrally with a front axle case 25 at the front side of the mission case 18 and a pair of left and right front axle cases 25 is provided. The rear wheels 26 and 27 are linked together, while the rear axle case 28 is integrally formed with the rear axle case 28 on the rear side of the mission case 18. 9, 30 are linked.

As shown in FIGS. 1 and 2, the prime mover unit 7 has an engine 31 as a prime mover mounted on an upper portion of an engine support plate 13, and a motor case 18 is interlocked with the engine 31. ing.

In the engine unit 7, the fuel tank 32 is disposed immediately above the engine 31 and the engine 31 is covered with a bonnet 33. Has prepared seedling stands 34 and 34 for holding spare seedlings.

As shown in Fig. 1, the driving operation unit 8 has a steering post 35 standing on the bonnet 33, a steering wheel 36 on the upper end of the steering post 35, and a steering wheel 36 on the steering post 35. A seat 37 is arranged immediately behind the wheel 36.

The driving operation unit 8 is provided on the left side of the bonnet 33 to change the traveling body 2. The gearshift lever 38 for speed operation and the clutch lever 39 that can be operated from outside the fuselage are arranged so as to be swingable in the front-rear direction, and the clutch pedal 40 is operated. The planting elevating lever 41 for raising and lowering the planting machine 3 is provided on the right side of the seat 37 so as to be swingable in the front-rear direction, while being arranged so as to be able to be depressed. .

The driving operation section 8 has a pair of left and right front steps 44, 44 on the left and right sides of the bonnet 33, and a cover body 45 from the lower portion of the seat 37 to the left and right sides. The floor is formed by the front steps 44, 44 and the force par 45. In the figure, reference numeral 46 denotes a lifting step formed on the cover body 45.

As shown in Fig. 1, the planting machine 3 has a planting mechanism 53 connected to the rear of the lifting mechanism 4, and a seedling table 47 at the top of the planting mechanism 5 It is mounted in the form. In the figure, 48 is a float.

Then, as shown in FIG. 2, the base end of the joint 50 is linked to the distal end of the PT output shaft 49 projecting rearward from the middle of the mission case 18.基 0 連動 0 連動連結 5 5 5 5 5 5 5 5 5 5 5 Ο 5 Ο Ο 5 5 5 Ο 5 5 Ο Ο Ο Ο 5 5 5 5 伝導伝導 5 伝導伝導. The tip of 52 is interlocked to the planting mechanism 53 to transmit the power to the planting machine 3.

The lifting mechanism 4 mounts a pair of left and right upper links 54, 54 between the upper portions of the inclined pipes 16, 17 at the rear of the traveling body 2 so as to be vertically rotatable, while the middle of the inclined pipes 16, 17 A pair of left and right lower links 55, 55 are vertically rotatably mounted between the parts, and a pair of left and right lifting links 56, 56 connected to the lower links 55, 55 are raised and lowered (not shown). ) To move the planting machine 3 up and down.

As shown in Fig. 3, the planting mechanism 53 is spaced apart in the width direction. Three pipe-shaped front-rear extension frames 57, 58, 59 extending in the front-rear direction, and the left-right width direction extending between the front ends of the front-rear extension frames 57, 58, 59. Two pipe-shaped left and right distraction frames 60, 61, and a pipe-shaped rearward extension extending in the left and right width direction connected to the rear end of each front and rear extension frame 57, 58, 59. A transmission casing 65 in the form of a pipe frame is formed from the end frames 62, 63, and 64. In the figure, reference numeral 66 denotes a hollow connecting member interposed between the longitudinally extending frames 57, 58, 59 and the laterally extending frames 60, 61.

As described above, in this embodiment, since the transmission casing 65 of the planting mechanism 53 is formed in a pipe frame shape, the weight and cost of the planting mechanism 53 can be reduced.

In addition, the planting mechanism 53 is attached to the front and rear extension frames 57, 58, and 59 by the drive shaft.

67, 68, and 69 are rotatably accommodated, respectively, while the left and right extension frames 60 and 61 accommodate the interlocking shafts 70 and 71 rotatably, respectively. Planting arm shafts 72, 73, 74 are rotatably housed in frames 62, 63, 64, respectively, and a central drive shaft 68 is linked to a PTO output shaft 49, The front ends of the drive shafts 67, 68, 69 are linked to each other by the drive shafts 70, 71, and the planted arm shafts 7 are attached to the rear ends of the drive shafts 67, 68, 69. 2, 73 and 74 are interlockingly connected via unit clutches 75, 76 and 77. In the figure, reference numeral 78 denotes a lateral feed mechanism for reciprocating the seedling table 47 in the left-right width direction.

Thus, inside the transmission casing 65 in the form of a pipe frame, the drive shafts 67, 68, 69, the interlocking shafts 70, 71 and the planting arm shafts 72, 73,

The interlocking connection of the planting mechanism 53 enables the power transmission structure of the planting mechanism 53 to be simplified, so that the planting mechanism 53 can be reduced in size and weight and the manufacturing cost can be reduced. In particular, by disposing the unit clutches 75, 76, 77 inside the rear end frames 62, 63, 64, the unit clutches 75, 76,

7. The assembling workability of 7 can be improved.

Each of the planting arm shafts 72, 73, 74 is interlockingly connected via a front crank 81 to the middle of the planting arm 80 having a planting claw 79. The rear end of 0 is connected via a rear crank 83 to the rear end of a support 82 mounted on the upper part of the rear end frames 62, 63, 64.

The unit clutches 75, 76, and 77 have the same structure, and the structure of the unit clutch 75 on the left side will be described. The unit clutch 75 is shown in FIGS. As shown in the figure, a transmission gear (bevel gear) 84 interlockingly connected with the drive shaft 67 is rotatably fitted to the planting arm shaft 72 so that the transmission gear 84 and the planting arm shaft 72 are connected. A clutch operating body 85 for performing the clutch operation by being connected or disconnected is slidably disposed along the planting arm shaft 72, and the clutch operating body 85 and the planting arm shaft are provided. 7 and 2 are moved and connected by spline fitting. In the figure, reference numeral 86 denotes a spline groove, 87 denotes an urging spring for urging the clutch operating body 85 toward the transmission gear 84, 93 denotes a bearing, 94 denotes a bevel gear, and 95 denotes a bevel gear. It is a shaft support.

As shown in FIGS. 5 and 8, the transmission gear 84 has an inclined tooth surface 89 at the end of a cylindrical gear body 88, and a part of the tooth surface 89 is formed as a gear. Body

Two engagement portions 90, which are notched in a concave shape along the axis of 88, are formed at intervals in the circumferential direction.

On the other hand, as shown in FIG. 5 and FIG. 9, the clutch operating body 85 has two clutches protruding from the end of the cylindrical operating body 91 along the axis of the operating body 91. The claws 92 are formed at intervals in the circumferential direction.

Then, the clutch operating body 85 is actuated by the urging force of the urging spring 87. When urged toward the transmission gear 84 and the clutch claws 92 of the clutch operating body 85 are engaged with the engaging portions 90 of the transmission gear 84, the transmission gear 84 and the planting arm The shaft 72 is connected, and the clutch operating body 85 is moved in the direction away from the transmission gear 84 against the urging force of the urging spring 87, and the clutch of the clutch operating body 85 is moved. Engagement part between pawl 92 and transmission gear 84

When the engagement with 90 is released, the transmission gear 84 and the planting arm shaft 72 are disconnected.

As described above, in this embodiment, the engaging portion 90 in which the clutch claw 92 of the clutch operating body 85 engages with a part of the tooth surface 89 of the transmission gear 84 is integrated with the transmission gear 84. As a result, there is no need to provide a separate member for engaging with the clutch claws 92 of the clutch operating body 85, thereby reducing the number of parts and reducing the number of unit clutches 75, 76, 77. The size and weight can be reduced.

Moreover, in this embodiment, since the engaging portion 90 is formed in a four-shape with respect to the tooth surface 89 of the transmission gear 84, the transmission gear 84 is molded by precision fabrication and at the same time, the engagement portion 90 is formed. 90 can also be molded, and the engaging portion 90 can be easily formed, so that the manufacturing cost can be reduced.

As shown in FIGS. 5 to 7, the unit clutch 75 has bulge-formed openings 96, 97 formed at the front and rear portions of the rear end frame 62, and has a front opening 96. At the same time, the rear end portion of the front and rear extension frame 57 is fitted and connected, while the rear opening 97 is covered with a disc-shaped lid 98, and furthermore, the rear end frame 62 is A bulge-shaped opening 99 is also formed in the upper part, and a clutch operating member for connecting and disconnecting a unit clutch 75 is formed in the opening 99.

1 0 0 _c clutch operating member support 1 0 1 are attached the clutch operating member support 1 0 1 for supporting the forms form a cylindrical fitting portion 1 0 2 in the lower part, the fitting portion 1 0 2 is inserted into the upper opening 9 9 of the rear end frame 6 2, and the fixing bolt 1 is attached to the bracket 103 mounted on the upper end of the rear end frame 62. A cylindrical clutch operating member 100 is rotatably mounted in a through hole 105 penetrating from above to below. 1 1 2 is packing.

As described above, since the opening 99 is formed in the upper part of the rear end frame 62 and the clutch operating member support 101 for supporting the clutch operating member 100 is attached to the opening 99, the transmission is performed. After attaching the planting arm shaft 72 on which the gear 84 and the clutch operating body 85 are mounted to the rear end frame 62, assemble the clutch operating member support 101 on which the clutch operating member 100 is mounted. It is possible to improve the assembly workability.

Moreover, by simply removing the clutch operating member support 101, maintenance work on the components constituting the unit clutch 75, such as the transmission gear 84, the clutch operating body 85, and the planting arm shaft 72, can be performed. Therefore, the maintainability of the unit clutch 75 can be improved.

In particular, by inserting the fitting portion 102 of the clutch operating member support 101 into the opening 99 formed by the bulge, the clutch operating member support 101 is attached to the opening 99 of the rear end frame 62. Therefore, assembling accuracy can be improved, and maintenance can be improved since the assembling can be performed without using oil or the like.

The clutch operating member 100 has an operating claw 106 formed at the lower end thereof, and the operating claw 106 is engaged with the flange 107 of the clutch operating body 85, while a clutch operating lever is provided at the upper end. 1 08 is installed. In the drawing, 109 is a biasing spring, 110 is a set screw for a biasing spring, and 111 is an adjusting plate. As shown in FIG. 3, each of the clutch operating members 100 has an operation provided on the back surface of the seedling mounting table 47 through the clutch operating wires 118, 119, and 120. The clutch is connected to a lever (not shown), and each clutch operation wire 1 18, 1 19, 1 20 outer receptacle 1 2 1, 1 22, 1 2 3 The clutch operating wires 1 1 1, 1 1 9 and 1 2 0 along the front and rear extension frames 5 7, 5 8 and 5 9 respectively. Attached, each of the clutch operation wires 1 18, 1 19, 12 0 Rotate the planting arm 8 0 · Front and rear side cranks 8 1, 8 3 and the lateral feed mechanism 7 8 to move left and right 7 8 · Seedling It does not touch the table 47.

Then, when the clutch operating member 100 is rotated by using the clutch operating lever 108, the operating claw 106 presses the flange 107 of the clutch operating body 85, and the clutch operating body 85 Moves in the direction away from the transmission gear 84 against the biasing force of the biasing spring 87, and the engagement between the clutch claw 92 of the clutch operating body 85 and the engaging portion 90 of the transmission gear 84 is established. The engagement is released, and the transmission gear 84 and the planting arm shaft 72 are disconnected.

Also, the clutch operating member support 101 allows the clutch operating body 85 to slide along the planting arm shaft 72 only within the predetermined rotation angle range of the clutch operating body 85. To stop the drive of the planting arm 80 with the transmission gear 84 and the planting arm shaft 72 cut off, and attach it close to the planting arm shaft 72. ing.

That is, the stop member 113 is attached to the arm arm shaft 72 on the lower surface of the fitting portion 102 of the clutch operating member support body 101 and directly above the plant arm 72. The engaging recess 1 1 4 into which the stop member 113 engages with the end face of the clutch operating body 85 while being screwed toward the clutch operating body 85 is formed in a state extended in the circumferential direction, and the engaging recess 1 1 4 is formed. Both ends 1 15 and 1 16 of 4 are formed in an inclined shape. When the stop member 113 can be engaged with the engagement recess 114 of the clutch operating body 85, that is, when the clutch operating body 85 is within a predetermined rotation angle range, the clutch operating lever When the clutch operating member 100 is rotated by using the lever 108, a stop is formed at the engagement recess 1 14 of the clutch operating body 85. The material 113 is engaged, and the clutch operating member 85 moves along the planting arm axis 72, while the stop member 113 is engaged with the engaging recess 114 of the clutch operating member 85. If the clutch operating member 85 cannot be engaged, that is, if the clutch operating body 85 is out of the predetermined rotation angle range, even if the clutch operating member 100 is rotated using the clutch operating lever 108, the clutch operates. The stop member 113 contacts the end face 111 of the body 85, and the movement of the clutch operating body 85 is prevented.

The predetermined rotation angle range of the clutch operating body 85 is, as shown in FIG. 10, the rotation angle when the tip of the planting claw 79 is located above the float 48 and the planting claw 7. 9 is set to be a rotation angle between the rotation angle at the position where the seedlings are taken out from the seedling mounting table 47.

As described above, in the present embodiment, the stop member 113 is provided on the unit clutch 75, and the rotation angle of the clutch operating body 85 is reduced by the action of the stop member 113 so that the planting claw 79 is formed. The clutch operating body 85 moves along the planting arm shaft 72 only between the rotation angle when it is located above the float 48 and the rotation angle at the position where the planting claws 79 take out the seedlings. Since the sliding is allowed, when the unit clutch 75 operates, the tip of the planting claw 79 does not stop with the tip of the planting claw 79 located below the float 48, and the planting is performed. It is possible to prevent the claws 79 from being damaged by colliding with the field scene or the road surface, and the planting claws Ί 9 do not stop while holding the seedlings, thus wasting seedlings. Not even.

Moreover, since the stop members 113 are arranged near the planting arm shaft 72, the unit clutch 75 can be made as small as possible.

In particular, since the stop member 113 is attached to the clutch operating member support 101, the clutch operating member 100 and the stop member 113 are the same member (the clutch operating member support 101). It can be attached, the positional accuracy between the two is improved, and the clutch operation by the clutch operating member 100 can be performed smoothly. I can.

Further, in this embodiment, since both end portions 115 and 116 of the engagement concave portion 114 provided in the clutch operating body 85 are formed in an inclined shape, the rotating clutch operating body 85 The stop member 113 is smoothly engaged with the engagement recess 114, and the clutch operation of the unit clutch 75 can be smoothly operated. Industrial applicability

The present invention is embodied in the above-described embodiment, and has the following effects.

That is, according to the present invention, a plurality of pipe-shaped front-rear extension frames extending in the front-rear direction, a pipe-shaped left-right extension frame extending between left and right front ends of the front-rear extension frames, The transmission casing of the planting mechanism is formed in the shape of a pipe frame from the pipe-shaped rear end frame that extends in the left-right width direction that is connected to the rear end of the plant. In addition, the assembly workability is improved and the manufacturing cost can be reduced.

In addition, the front ends of the drive shafts rotatably housed in the respective front and rear extension frames are interlocked and connected by the interlocking shafts rotatably housed in the left and right extension frames, and the rear ends of the drive shafts are connected to the rear ends. The planting arm shaft, which is rotatably housed in the end frame, is interlocked and connected via a unit clutch, and the planting arm with a planting claw is interlockingly connected to the planting arm shaft. The power transmission structure can be simplified, and this can also reduce the size and weight of the planting mechanism and reduce the manufacturing cost.

Further, since the unit clutch is disposed on the rear end frame, the workability of unit clutch assembly can be improved.

In particular, the transmission in which the unit clutch is linked to the planting arm shaft in conjunction with the drive shaft A clutch operating body for performing a clutch operation is freely movably arranged along the planting arm shaft by loosely fitting the moving gear and connecting or disconnecting the transmission gear and the planting arm shaft. The transmission gear and the planting arm shaft are cut off to stop the driving of the planting arm by allowing the clutch working body to slide only within the predetermined rotation angle range of the clutch working body. Since the stop member is arranged near the planting arm shaft, the size of the unit clutch can be reduced as much as possible.

Moreover, the stop member can be used only when the rotation angle of the clutch operating body is between the rotation angle when the planting claw is positioned above the float and the rotation angle at the position where the planting claw takes out the seedling. Since the sliding of the operating body is allowed, when the jet clutch operates, the tip of the planting claw does not stop with the tip of the planting claw located below the float, and the planting claw is moved to the field. It is possible to prevent damage caused by colliding with a surface or a road surface, and the planting claw does not stop while holding the seedling, thereby preventing waste of the seedling.

In addition, since the engaging recess is formed in the clutch operating body in which the stop member is engaged only within a predetermined rotation angle range of the clutch operating body, and the end of the engaging recess is formed in an inclined shape. The stopping member smoothly engages with the engaging concave portion of the rotating clutch operating body, so that the clutch operation of the unit clutch can be smoothly operated.

Claims

The scope of the claims

1. In a riding rice transplanter, a planting machine is installed at the rear of the traveling machine, and the planting mechanism provided on the planting machine is linked to the prime mover provided on the traveling machine.

The planting mechanism includes a plurality of pipe-shaped front and rear extension frames extending in the front-rear direction, and a pipe-shaped left and right extension frame extending between the front ends of the front-rear extension frames and extending in the left-right width direction. A pipe-shaped transmission casing is formed from a pipe-shaped rear end frame that extends in the left-right width direction and is connected to the rear end of the frame.

The front ends of the drive shafts rotatably housed in the front and rear extension frames are connected to each other by interlocking shafts rotatably housed in the left and right extension frames. The planting arm shaft rotatably housed in the rear end frame is interlocked and connected via a unit clutch, and the planting arm having a planting claw is interlockingly connected to the planting arm shaft.

Moreover, the planting mechanism for a riding rice transplanter, wherein the unit clutch is disposed on a rear end frame.

2. In the unit clutch, the transmission gear that is interlocked with the drive shaft is loosely fitted to the planting arm shaft, and the clutching operation is performed by connecting or disconnecting the transmission gear and the planting arm shaft. The clutch actuating body is slidably disposed along the planting arm axis, and the clutch actuating body is allowed to slide only within a predetermined rotation angle range of the clutch actuating body. The planting mechanism for a riding rice transplanter according to claim 1, characterized in that a stop member for stopping the driving of the planting arm by disconnecting the planting arm shaft from the planting arm shaft is provided near the planting arm shaft. .

3. The rotation angle of the clutch operating body is determined by the rotation angle when the planting claw is positioned above the float and the rotation angle when the planting claw removes the seedling. 3. The planting mechanism for a riding rice transplanter according to claim 2, wherein the clutch operating body is allowed to slide only between the two.

4. An engaging recess into which the stop member engages only within a predetermined rotation angle range of the clutch operating body is formed in the clutch operating body, and the end of the engaging concave is formed to be inclined. 4. The planting mechanism of a riding rice transplanter according to claim 2 or claim 3.