JP5431114B2 - Walking rice transplanter - Google Patents

Description

  The present invention relates to a technique of a walking type rice transplanter. More specifically, the present invention relates to a technique for switching on / off of a main clutch and posture control of a walking type rice transplanter with one operation system.

2. Description of the Related Art Conventionally, walking type rice transplanters including a main clutch that switches whether to transmit engine driving force to a transmission case are known.
As an example of such a main clutch, a belt tension type clutch is known. For example, it is as described in Patent Document 1 and Patent Document 2.

As an example of a general belt tension type clutch, an arm that is rotatably supported by the body of a walking type rice transplanter, a roller that is rotatably supported by one end of the arm, and an end that is supported by the arm. A spring that is fixed and has the other end fixed to the body of the walking type rice transplanter, and urges the roller against the belt for transmitting the driving force of the engine to the transmission case, and one end of the arm A wire (wire for operating the main clutch) connected to the middle part or the other end of the arm, and a main clutch provided to the rear handle of the walking type rice transplanter while the other end of the wire is connected And a lever (a lever for operating the main clutch).
In the case of the belt tension type clutch, when the operator is not touching the main clutch lever, the roller is pressed against the belt by the biasing force of the spring, and the tension of the belt increases, so that the main clutch is "on" The driving force is transmitted to the transmission case).
When the operator holds the main clutch lever, the roller is separated from the belt against the biasing force of the spring, and the main clutch is "disengaged" by reducing the belt tension (the engine driving force is the transmission case). State that is not transmitted to).

  In addition, a pitching control mechanism, which is a mechanism that stabilizes the seedling planting depth by the walking type rice transplanter by controlling the inclination of the body of the walking type rice transplanter in the front-rear direction, and thus the height of the aircraft relative to the paddy field, is also known. ing. For example, it is as described in Patent Document 1 to Patent Document 6.

  As an example of a general pitching control mechanism, a single-acting hydraulic pressure for rotating an arm whose one end is rotatably supported by the airframe and whose traveling wheel is rotatably supported by the other end. Cylinder (pitching cylinder), a state in which the hydraulic cylinder is extended by supplying hydraulic oil to the hydraulic cylinder, a state in which the total length of the hydraulic cylinder is kept constant by enclosing the hydraulic oil in the hydraulic cylinder, and a hydraulic oil from the hydraulic cylinder A hydraulic pump that can be switched to one of the states in which the hydraulic cylinder is contracted by collecting the float, a float that is rotatably supported at the bottom of the body of the walking type rice transplanter, and a float for the body of the walking type rice transplanter A float sensor that detects a rotation angle, and a link between the rotation angle of the float detected by the float sensor and the state of the hydraulic pump It includes those comprising the order of the link mechanism.

When carrying out the operation of loading a spare seedling into the walking type rice transplanter, the weight of the walking type rice transplanter increases greatly, and the posture of the walking type rice transplanter may change.
Therefore, when a work is performed to load spare seedlings onto the walking type rice transplanter while the pitching control mechanism is in operation, the posture of the walking type rice transplanter becomes unstable (the walking type rice transplanter is May show external behavior).
As a means for solving such a problem, a walking type rice transplanter including a “mechanism for manually switching between a state in which the pitching control mechanism operates and a state in which the pitching control mechanism does not operate” is also known. For example, it is as described in Patent Document 1 to Patent Document 6.
As a specific example of “a mechanism for manually switching between a state in which the pitching control mechanism is activated and a state in which the pitching control mechanism is not activated”, the rotation angle of the float detected by the float sensor and the state of the hydraulic pump are linked. The float sensor is switched between a rotatable state and a non-rotatable state by operating a member that is detachably engaged with an arm constituting the linkage mechanism (see Patent Document 2). There are known ones that provide a clutch in the middle to switch on / off of the clutch (see Patent Document 5), and those that change the position of the stand that restricts the movement (rotation) of the float by contacting the float. ing.

  In the case of the walking type rice transplanter described in Patent Document 2, Patent Document 3 and Patent Document 5, the main clutch operation system (the combination of the wire and the clutch lever) and “the state in which the pitching control mechanism operates and the pitching control mechanism are Since it is different from the operation system of the “mechanism for manually switching the non-operating state”, at least two wires and two clutch levers are required to achieve these operation systems.

  When carrying out the work of loading spare seedlings into the walking type rice transplanter while keeping the pitching control mechanism inoperative, the walking type rice transplanter usually does not run and does not carry out the rice planting work. When the main clutch is held in the “disengaged” state by linking the operation system of “a mechanism for manually switching between a state where the pitching control mechanism is activated and a state where the pitching control mechanism is not activated”, the pitching control mechanism is not activated. A walking type rice transplanter that maintains the state is also known. For example, as described in Patent Document 1, Patent Document 4, and Patent Document 6.

However, in the case of the walking type rice transplanter described in Patent Document 1, Patent Document 4 and Patent Document 6, the wire that forms the operation system of the main clutch and the “state in which the pitching control mechanism operates and the pitching control mechanism operate It requires two wires of the wire that constitutes the operation system of the “mechanism for manually switching the state not to be performed”.
In the case of the walking type rice transplanter described in Patent Document 1, a specific configuration of “a mechanism for manually switching between a state in which the pitching control mechanism operates and a state in which the pitching control mechanism does not operate” is not disclosed.
Further, in the case of the walking type rice transplanter described in Patent Document 4 and Patent Document 6, a complicated link mechanism for linking the two operation systems is required.
As described above, when the operation system of the main clutch and the operation system of “a mechanism for manually switching the state where the pitching control mechanism is activated and the state where the pitching control mechanism is not activated” are linked, these operation systems become complicated. The number of parts will increase.

Japanese Utility Model Publication No. 1-90315 Japanese Utility Model Publication No. 64-9513 Japanese Utility Model Publication No. 64-24908 JP 59-88016 A JP 63-141510 A JP-A-6-78611

  An object of the present invention is to provide a walking type rice transplanter that can be operated in a linked manner with a main clutch and a stand that regulates the movement of a float with a simple structure having a smaller number of parts than conventional ones.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1,
A stand capable of changing the posture between a restriction posture that restricts the front end of the float from moving upward and a retreat posture that does not restrict;
An on / off member provided in a main clutch for transmitting and stopping driving force from the engine to the transmission;
A walking type rice transplanter having an operation mechanism for operating
The operating mechanism is
A wire member having one end fixed to the stand;
An engagement member that is fixed to a midway portion of the wire member and engages with an on / off member of the main clutch;
A spring member provided at a position in the middle of the wire member and closer to one end of the wire member than the engaging member;
An operation member connected to the other end of the wire member;
Comprising
When the other end portion of the wire member is pulled by operating the operation member, the stand rotates to change the stand posture from the retracted posture to the restricting posture, and the on / off member. However, when the main clutch rotates while engaging with the engaging member, transmission of the driving force to the transmission is stopped.

In claim 2,
The stand is
A stand shaft that is pivotally supported by the airframe;
An abutment portion fixed to the stand shaft portion and abutting against an upper surface of the float in the restricted posture;
One end part is fixed to the stand shaft part, and the other end part is an operation arm part to which one end part of the wire member is fixed,
Comprising
The main clutch is
A main arm portion rotatably supported by the airframe;
A roller portion rotatably supported at one end of the main arm portion;
An engagement portion fixed to the main arm portion and engaged with the engagement member;
An urging portion that urges the main arm portion so that the roller portion rotates in a direction in contact with a belt that transmits driving force from the engine to the transmission;
Comprising
The engaging portion of the main clutch corresponds to the on / off member.

In claim 3,
By forming the middle part of the steel wire in a spiral shape, a portion of the steel wire that is formed in a spiral shape is used as the spring member, and a portion of the steel wire that is not formed in a spiral shape is used as the wire member. To do.

  The present invention has an effect that it is possible to operate the main clutch and the stand for restricting the movement of the float in association with each other with a simple structure having a smaller number of parts than in the past.

The left front perspective view which shows one Embodiment of the walk type rice transplanter which concerns on this invention. The right back perspective view showing one embodiment of the walk type rice transplanter concerning the present invention. The left view which shows one Embodiment of the walk type rice transplanter which concerns on this invention. The top view which shows one Embodiment of the walk type rice transplanter which concerns on this invention. The disassembled perspective view which shows the body of one Embodiment of the walk type rice transplanter which concerns on this invention. The skeleton figure which shows the transmission mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The expanded sectional view which shows the mission case of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the center float of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the left side float and right side float of one Embodiment of the walk type rice transplanter which concerns on this invention. The schematic diagram which shows the pitching control mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the pump unit of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the pitching sensor of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the pitching cylinder of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the swing apparatus of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the stand of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the main clutch of one Embodiment of the walk type rice transplanter which concerns on this invention. (A) The left view which shows the main clutch of one Embodiment of the walk type rice transplanter which concerns on this invention, (b) The front view which shows the main clutch of one Embodiment of the walk type rice transplanter which concerns on this invention. The perspective view which shows the operation mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. (A) An exploded perspective view showing an engaging member of an embodiment of a walking type rice transplanter according to the present invention, (b) A cross-sectional view showing an engaging member of an embodiment of a walking type rice transplanter according to the present invention. . The left view which shows the wire member of one Embodiment of the walk type rice transplanter which concerns on this invention when the main clutch is "on". The left view which shows the wire member of one Embodiment of the walk type rice transplanter which concerns on this invention when the main clutch is "disengaged." The left view which shows another embodiment of the operation mechanism of the walk type rice transplanter which concerns on this invention.

  Below, the whole structure of the walk type rice transplanter 1 which is one Embodiment of the walk type rice transplanter which concerns on this invention using FIG. 1 to FIG. 21 is demonstrated.

The walking type rice transplanter 1 of this embodiment shown in FIG. 1 is a so-called four-row type walking type rice transplanter.
As shown in FIG. 1 to FIG. 7, FIG. 10, FIG. 15 and FIG. 16, the walking type rice transplanter 1 mainly includes a body 2 (see FIG. 5), an engine 3, a left wheel 4L, a right wheel 4R, and a planting device 5 (see FIG. 6 and FIG. 7), seedling supply device 6, transmission mechanism 7 (see FIGS. 6 and 7), center float 10C, left side float 10L, right side float 10R, pitching control mechanism 11 (see FIG. 10), stand 15 (Refer FIG. 15), the main clutch 16 (refer FIG. 16), and the operation part 17 are comprised.

Airframe 2 is one embodiment of the airframe according to the present invention, and is a group of members that constitute the main structure of walking type rice transplanter 1.
As shown in FIG. 5, the airframe 2 includes an engine stand 21, a bumper 22, a mission case 23, a center frame 24, a left axle case 25L, a right axle case 25R, a left side frame 26L, a right side frame 26R, a central planting case 27C, a left A planting case 27L, a right planting case 27R, a left rear frame 28L, and a right rear frame 28R are provided.
In addition, the airframe which concerns on this invention is not limited to a structure like the airframe 2 of this embodiment.

  The engine stand 21 is a member that forms the front portion of the airframe 2. The engine base 21 of the present embodiment is manufactured by appropriately bending a metal plate.

  The bumper 22 is a member for protecting the front portion of the airframe 2. The bumper 22 is fixed to the front end portion of the engine base 21.

The transmission case 23 is a member that accommodates (a part of) a member group that constitutes the transmission mechanism 7 described later. The mission case 23 of the present embodiment includes a left side member 23L and a right side member 23R, which are cast products, and bolts for fixing them.
The front end portion of the transmission case 23 is fixed to the rear end portion of the engine base 21 with bolts.

  The center frame 24 is a member that forms the central portion of the airframe 2. The center frame 24 of the present embodiment is a metal rectangular tube-shaped member extending in the front-rear direction. The front end portion of the center frame 24 is fixed to the rear end portion of the mission case 23 with bolts.

The left axle case 25L is a member that supports the left wheel 4L so as to be swingable in the vertical direction with respect to the airframe 2 and supports the left wheel 4L.
One end portion (front end portion) of the left axle case 25L is rotatably supported on the left side surface (left side member 23L) of the mission case 23, and the other end portion of the left axle case 25L is substantially behind one end portion of the left axle case 25L. Placed in. The left wheel 4L is pivotally supported on the other end (rear end) of the left axle case 25L.

The right axle case 25R is a member that supports the right wheel 4R so as to be swingable in the vertical direction with respect to the airframe 2, and supports the right wheel 4R.
One end portion (front end portion) of the right axle case 25R is rotatably supported on the right side surface (right side member 23R) of the mission case 23, and the other end portion of the right axle case 25R is substantially behind one end portion of the right axle case 25R. Placed in. The right wheel 4R is pivotally supported on the other end portion (rear end portion) of the right axle case 25R.

  The left axle case 25L and the right axle case 25R of the present embodiment are members formed into a long and narrow case shape (a shape in which a space is formed) by pressing a metal plate.

The left side frame 26 </ b> L is a member that forms the left side of the body 2, and the right side frame 26 </ b> R is a member that forms the right side of the body 2.
The left side frame 26L and the right side frame 26R of the present embodiment are obtained by connecting the ends of two metal cylinders with a joint member having a substantially L-shaped outer shape.
One end of the left side frame 26L (the end of one of the two cylinders connected by the joint member that is not fixed to the joint member) is on the left side of the mission case 23 (the left side member 23L). The other end of the left side frame 26L is fixed (the end of the two cylinders connected by the joint member that is not fixed to the joint member in the other cylinder) is one end of the left side frame 26L. It is arranged at a position on the rear left side and slightly below.
Similarly, one end portion of the right side frame 26R is fixed to the right side surface (right side member 23R) of the mission case 23, and the other end portion of the right side frame 26R is located at the rear right side and slightly below the one end portion of the right side frame 26R. It is arranged at the position.

The center planting case 27C supports the center left planting arm 51L and the center right planting arm 51R in the planting device 5 to be described later so as to be able to rotate and transmit a driving force thereto.
The center planting case 27 </ b> C of the present embodiment is a cast product, and the front end portion of the center planting case 27 </ b> C is fixed to the rear end portion of the center frame 24.

The left planting case 27L supports the left planting arm portion 52L of the planting device 5 to be described later rotatably and transmits a driving force thereto.
The left planting case 27L of the present embodiment is a cast product, and the front end portion of the left planting case 27L is fixed to the other end portion (rear end portion) of the left side frame 26L.

The right planting case 27R rotatably supports the right planting arm portion 52R in the planting device 5 described later and transmits a driving force thereto.
The right planting case 27R of the present embodiment is a cast product, and the front end portion of the right planting case 27R is fixed to the other end portion (rear end portion) of the right side frame 26R.

The left rear frame 28 </ b> L is a member that forms the left rear portion of the body 2.
The left rear frame 28L of the present embodiment is a metal rectangular tube-like member extending in the front-rear direction, and the front end portion of the left rear frame 28L is fixed to the rear end portion of the left planting case 27L.

The right rear frame 28 </ b> R is a member that forms the right rear portion of the airframe 2.
The right rear frame 28R of the present embodiment is a metal rectangular tube-shaped member extending in the front-rear direction, and the front end portion of the right rear frame 28R is fixed to the rear end portion of the right planting case 27R.

  An engine 3 shown in FIG. 6 is an embodiment of the engine according to the present invention, and is a driving source of the walking type rice transplanter 1. The engine 3 of this embodiment is a gasoline engine, and is fixed to the rear part of the upper surface of the engine stand 21.

  The left wheel 4L and the right wheel 4R shown in FIGS. 1 to 4 are drive wheels of the walking type rice transplanter 1. The left wheel 4L is pivotally supported on the other end (rear end) of the left axle case 25L. The right wheel 4R is pivotally supported by the other end portion (rear end portion) of the right axle case 25R.

A planting device 5 shown in FIG. 6 is a device for planting seedlings. The planting device 5 of the present embodiment is a crank type planting device, and includes a central left planting arm 51L, a central right planting arm 51R, a left planting arm 52L, a right planting arm 52R, and a drive arm and an interlocking arm (not shown). Etc.
The left planting arm part 52L, the central left planting arm part 51L, the central right planting arm part 51R and the right planting arm part 52R are arranged in the rear lower part of the body 2 of the walking-type rice transplanter 1 in a state of being spaced in order from the left. Be placed.
The central left planting arm part 51L, the central right planting arm part 51R, the left planting arm part 52L and the right planting arm part 52R are located from a seedling mat placed on a seedling supply device 6 (the front end part of the seedling stage 61) described later. The seedlings are planted in the paddy field by performing a series of operations of cutting a certain amount of seedlings and transplanting the cut seedlings to the paddy field.

The seedling supply device 6 shown in FIGS. 1 to 4 is a device that supplies seedlings to the planting device 5.
The seedling supply device 6 includes a seedling placing table 61, a vertical feeding device 62, a horizontal feeding device 63 (see FIG. 6), and a preliminary seedling table 64.

The seedling stage 61 is a stage on which seedlings to be supplied to the planting device 5 are placed. The seedling stage 61 is a plate-like member having a mounting surface inclined downward and is fixed to the seedling stage frame (the handle frame 171 in the present embodiment) at the rear of the machine body 2 in the left-right direction. It is slidably mounted on the rail and the lower seedling rail.
A seedling mat (a seedling root is entangled in the mat-like material by seeding the seeds on a mat-like material such as floor soil or lemma mat) is placed on the placement surface of the seedling placing table 61. .
The front end portion of the seedling mount 61 is disposed at a position above the center left planting arm 51L, the center right planting arm 51R, the left planting arm 52L, and the right planting arm 52R.

  The vertical feeding device 62 is a device that is disposed in the lower front part of the seedling table 61 and conveys the seedling mat placed on the placement surface of the seedling table 61 to the front end of the seedling table 61. The vertical feeding device 62 is provided on the surface (back surface) opposite to the placement surface of the seedling table 61, and the seedling mat is directed toward the front end portion of the seedling table 61 by rotationally driving a roller protruding from the placement surface. Transport.

  The lateral feed device 63 reciprocates the seedling placing table 61 to the left and right, and is disposed on the front lower side of the seedling placing table 61.

  The spare seedling stand 64 is a stand for placing a spare seedling (a spare seedling mat) to be supplied to the seedling placing stand 61. The preliminary seedling table 64 is fixed to the machine body 2 and is disposed at a position in front of the seedling mounting table 61 and above the machine body 2.

Hereinafter, the transmission mechanism 7 will be described mainly with reference to FIGS. 6 and 7.
The transmission mechanism 7 is a mechanism (member group) for transmitting the driving force generated in the engine 3 (the driving force generated by the engine 3) to the left wheel 4L, the right wheel 4R, the planting device 5 and the seedling supply device 6. .
6 and 7, the transmission mechanism 7 includes pulleys 71a and 71b, a belt 71c, pulleys 72a and 72b, a belt 72c, a main shaft 73, gears 73a, 73b, 73c, 73d, 73e, and 73f, a transmission shaft 74, and a gear. 74a, transmission gear 75, left side clutch shaft 76L, right side clutch shaft 76R, side clutch gear 77, balls 78L, 78L ..., balls 78R, 78R ..., left side clutch shifter 79L, right side clutch shifter 79R , Left side clutch spring 80L, right side clutch spring 80R, sprocket 81L / 81R, sprocket 82L / 82R, chain 83L / 83R, left axle 84L, right axle 84R, stock shift shaft 85, gear 85a, first stock gear 86, Second stock gear 87, stock gear 88, planting clutch shaft 9, bevel gear 89a, planting clutch 90, central planting transmission shaft 91, bevel gears 91a and 91b, central planting arm shaft 92, bevel gear 92a, sprocket 92b, left planting transmission shaft 93L, right planting transmission shaft 93R, bevel gears 94L and 94R, left The rear transmission shaft 95L, the right rear transmission shaft 95R, the bevel gears 96L and 96R, the bevel gears 97L and 97R, the left planting arm shaft 98L, the right planting arm shaft 98R, and the bevel gears 99L and 99R are provided.
Of the group of members constituting the transmission mechanism 7 in this embodiment, the one housed in the mission case 23 is an embodiment of the transmission according to the present invention.

The pulley 71a is fixed to the middle portion of the output shaft 3a protruding leftward from the main body of the engine 3 so as not to be relatively rotatable.
The pulley 71b is fixed to the input shaft 112a protruding leftward from the casing 111 of the pump unit 110 so as not to be relatively rotatable (see FIG. 11).
The belt 71c is wound around the pulley 71a and the pulley 71b. When a tension pulley (not shown) is pressed against the belt 71c by the elastic force of the winding spring, a predetermined magnitude of tension is applied to the belt 71c.

  As shown in FIG. 6, the driving force generated in the engine 3 is transmitted to the pump unit 110 via the pulley 71a, the belt 71c, and the pulley 71b. More specifically, when the output shaft 3a of the engine 3 rotates, the pulley 71a, the belt 71c, the pulley 71b, and the input shaft 112a of the hydraulic pump unit 112 of the pump unit 110 described in detail later rotate, and the hydraulic pump unit 112 is driven.

The pulley 72a is fixed to the front end portion (left end portion) of the output shaft 3a of the engine 3 so as not to be relatively rotatable.
The pulley 72b is fixed to one end portion (left end portion) of a main shaft 73, which will be described later, so as not to be relatively rotatable.
The belt 72c is wound around the pulley 72a and the pulley 72b. A predetermined magnitude of tension can be applied to the belt 72c by the main clutch 16 described in detail later.
The belt 72c is an embodiment of the “belt that transmits the driving force from the engine to the transmission” according to the present invention.

  As shown in FIGS. 6 and 7, the main shaft 73 is a rotating shaft for inputting the driving force generated in the engine 3 to the mission case 23. The main shaft 73 is rotatably supported on the mission case 23. One end (left end) of the main shaft 73 protrudes to the left of the mission case 23, and the other part is accommodated in the mission case 23.

The gears 73 a, 73 b, 73 c, 73 d, 73 e, and 73 f are all fixed to the main shaft 73 so as not to be rotatable relative to the main shaft 73 and immovable in the axial direction (longitudinal direction) of the main shaft 73.
The gears 73a and 73b are spur gears involved in changing the traveling speed of the walking type rice transplanter 1, and the number of teeth of the gear 73a is larger than the number of teeth of the gear 73b in this embodiment.
The gears 73c, 73d, 73e, and 73f are gears related to the change in the interval (between strains) in the advancing direction of the seedlings planted by the walking type rice transplanter 1. The relationship of the number of teeth <the number of teeth of the gear 73f is established.

  The transmission shaft 74 is a rotation shaft related to the change of the traveling speed of the walking type rice transplanter 1. The transmission shaft 74 is rotatably supported by the transmission case 23 and is accommodated in the transmission case 23.

  The gear 74 a is a spur gear that is fixed to the transmission shaft 74 so as not to rotate relative to the transmission shaft 74 and to move in the axial direction of the transmission shaft 74. In the present embodiment, a gear 74 a is integrally formed on the right half of the transmission shaft 74, and a spline groove is formed on the left half of the transmission shaft 74.

The transmission gear 75 is a gear involved in changing the traveling speed of the walking type rice transplanter 1. The transmission gear 75 has a shape in which two spur gears having different numbers of teeth are stacked coaxially. The portion of the transmission gear 75 that forms the spur gear with the smaller number of teeth is the small gear portion 75a, and the portion that forms the spur gear with the larger number of teeth is the large gear portion 75b.
A through hole is formed in the transmission gear 75, and a spline groove is formed in the through hole. The transmission gear 75 is inserted into the left half of the transmission shaft 74.
Since the spline groove formed in the through hole of the transmission gear 75 and the spline groove formed in the left half portion of the transmission shaft 74 are engaged, the transmission gear 75 cannot rotate relative to the transmission shaft 74 and cannot be rotated. It can move in 74 axial directions (longitudinal direction).

The left side clutch shaft 76L is a rotating shaft related to transmission of driving force to the left wheel 4L.
A plurality of engagement grooves extending in the axial direction (longitudinal direction) of the left side clutch shaft 76L are formed on the outer peripheral surface of one end portion (right end portion) of the left side clutch shaft 76L.
The right half portion of the left side clutch shaft 76L is rotatably supported by the transmission case 23 and is accommodated in the transmission case 23. The left half portion of the left side clutch shaft 76L is rotatably supported by one end portion (front end portion) of the left axle case 25L and is accommodated in the left axle case 25L.
The left axle case 25L is supported on the transmission case 23 by the left side clutch shaft 76L so as to be rotatable (generally swingable in the vertical direction).

The right side clutch shaft 76R is a rotation shaft related to transmission of driving force to the right wheel 4R.
A plurality of engagement grooves extending in the axial direction (longitudinal direction) of the right side clutch shaft 76R are formed on the outer peripheral surface of one end portion (left end portion) of the right side clutch shaft 76R.
The left half of the right side clutch shaft 76R is rotatably supported by the transmission case 23 and is accommodated in the transmission case 23. The right half portion of the right side clutch shaft 76R is rotatably supported by one end portion (front end portion) of the right axle case 25R and is accommodated in the right axle case 25R.
The right axle case 25R is supported on the transmission case 23 by the right side clutch shaft 76R so as to be rotatable (generally swingable in the vertical direction).

  When the left side clutch shaft 76L and the right side clutch shaft 76R are pivotally supported by the transmission case 23, the left side clutch shaft 76L and the right side clutch shaft 76R are aligned with each other. Further, the right end surface of the left side clutch shaft 76L and the left end surface of the right side clutch shaft 76R are in light contact with each other.

The side clutch gear 77 is a spur gear for switching whether the driving force is transmitted to the left wheel 4L and whether the driving force is transmitted to the right wheel 4R.
The side clutch gear 77 has a shape in which a disk-shaped portion forming a spur gear and a pair of sleeve-shaped portions protruding from both end faces of the disk-shaped portion are combined.
The side clutch gear 77 is formed with a through hole that penetrates the disk-shaped portion and the pair of sleeve-shaped portions. The right end portion of the left side clutch shaft 76L and the left end portion of the right side clutch shaft 76R are inserted into the through hole.
When the right end portion of the left side clutch shaft 76L and the left end portion of the right side clutch shaft 76R are inserted into the through holes of the side clutch gear 77, the side clutch gear 77 is located with respect to the left side clutch shaft 76L and the right side clutch shaft 76R. The left side clutch shaft 76L and the right side clutch shaft 76R cannot move in the axial direction.
The pair of sleeve-like portions of the side clutch gear 77 is formed with a plurality of lateral holes that penetrate from the outer peripheral surfaces of the pair of sleeve-like portions to the through holes.
The side clutch gear 77 meshes with the gear 74a.

As shown in FIG. 7, the balls 78L, 78L,... And the balls 78R, 78R,.
Balls 78L, 78L,... Are accommodated in one of a plurality of lateral holes formed in the pair of sleeve-like portions of side clutch gear 77 corresponding to the right end of left side clutch shaft 76L.
Balls 78R, 78R,... Are accommodated in a plurality of lateral holes formed in a pair of sleeve-like portions of side clutch gear 77 corresponding to the left end of right side clutch shaft 76R.

As shown in FIG. 6, the left side clutch shifter 79L and the right side clutch shifter 79R are substantially tubular members.
The left side clutch shifter 79L is inserted through the right half of the left side clutch shaft 76L. The left side clutch shifter 79L penetrated by the left side clutch shaft 76L is movable in the axial direction of the left side clutch shaft 76L.
The right side clutch shifter 79R is inserted through the left half of the right side clutch shaft 76R. The right side clutch shifter 79R penetrated by the right side clutch shaft 76R is movable in the axial direction of the right side clutch shaft 76R.

The left side clutch spring 80L is a member that biases the left side clutch shifter 79L in a direction away from the right end of the left side clutch shaft 76L (left side). The left side clutch spring 80L of the present embodiment is a winding spring and is fitted to the left side clutch shaft 76L.
The left side clutch spring 80L is elastically deformed to urge the left side clutch shifter 79L.

The right side clutch spring 80R is a member that urges the right side clutch shifter 79R in a direction away from the left end portion of the right side clutch shaft 76R (right side). The right side clutch spring 80R of the present embodiment is a winding spring and is fitted to the right side clutch shaft 76R.
The right side clutch spring 80R urges the right side clutch shifter 79R by elastic deformation.

As shown in FIG. 6, when the left side clutch shifter 79L is moved to the left side by the urging force of the left side clutch spring 80L, the right end of the left side clutch shifter 79L is out of the pair of sleeve-shaped portions of the side clutch gear 77. It overlaps with the outer peripheral surface of the left part and closes the plurality of lateral holes formed in the part.
As a result, the balls 78L, 78L,... Accommodated in the lateral holes are a plurality of engagement grooves formed in the outer peripheral surface of the right end portion of the left side clutch shaft 76L and a plurality of laterals formed in the side clutch gear 77. The left side clutch shaft 76L and the side clutch gear 77 are engaged with each other by the balls 78L, 78L,.

When the left side clutch shifter 79L moves to the right side against the urging force of the left side clutch spring 80L by applying an external force to the left side clutch shifter 79L, the right half of the left side clutch shifter 79L is the side clutch gear. Of the pair of 77 sleeve-like portions, the outer peripheral surface of the left portion overlaps.
However, since a space capable of accommodating the balls 78L, 78L,... Is formed on the inner peripheral surface of the right half of the left side clutch shifter 79L, the left side of the pair of sleeve-like portions of the side clutch gear 77 is left. Balls 78L, 78L,... Can protrude from a plurality of lateral holes formed on the outer peripheral surface of the portion.
As a result, the balls 78L, 78L,... Accommodated in the lateral holes do not engage with the plurality of engagement grooves formed on the outer peripheral surface of the right end portion of the left side clutch shaft 76L, and the left side clutch shaft 76L and the side The clutch gear 77 is not connected by balls 78L, 78L,.

  In this way, by changing the position of the left side clutch shifter 79L (moving it to the left or right), whether or not the left side clutch shaft 76L and the side clutch gear 77 are coupled so as not to be relatively rotatable (sides). It is possible to switch whether or not the driving force can be transmitted from the clutch gear 77 to the left side clutch shaft 76L.

  Similarly, the right side clutch shifter 79R is connected so that the right side clutch shaft 76R and the side clutch gear 77 cannot be rotated relative to each other by changing the position of the right side clutch shifter 79R (moving it to the right side or the left side). (Whether or not the driving force can be transmitted from the side clutch gear 77 to the right side clutch shaft 76R) can be switched.

The sprocket 81L is fixed to the other end portion (left end portion) of the left side clutch shaft 76L so as not to be relatively rotatable, and is accommodated in the left axle case 25L.
The sprocket 82L is fixed to one end portion (right end portion) of the left axle 84L, which will be described later, so as not to be relatively rotatable, and is accommodated in the left axle case 25L.
The chain 83L is wound around the sprocket 81L and the sprocket 82L, and is accommodated in the left axle case 25L.

The left axle 84L is a rotating shaft for pivotally supporting the left wheel 4L on the left axle case 25L.
The left axle 84L is rotatably supported at the other end (rear end) of the left axle case 25L, the right half of the left axle 84L is accommodated in the left axle case 25L, and the left half of the left axle 84L is left It protrudes to the left side of the axle case 25L.
The left wheel 4L is fixed to the other end portion (left end portion) of the left axle 84L so as not to be relatively rotatable.

The sprocket 81R is fixed to the other end (right end) of the right side clutch shaft 76R so as not to be relatively rotatable, and is accommodated in the right axle case 25R.
The sprocket 82R is fixed to one end portion (left end portion) of the right axle 84R, which will be described later, so as not to be relatively rotatable, and is accommodated in the right axle case 25R.
The chain 83R is wound around the sprocket 81R and the sprocket 82R and accommodated in the right axle case 25R.

The right axle 84R is a rotating shaft for pivotally supporting the right wheel 4R on the right axle case 25R.
The right axle 84R is rotatably supported on the other end (rear end) of the right axle case 25R, the left half of the right axle 84R is accommodated in the right axle case 25R, and the right half of the right axle 84R is the right It protrudes to the right side of the axle case 25R.
The right wheel 4R is fixed to the other end portion (right end portion) of the right axle 84R so as not to be relatively rotatable.

The inter-strain transmission shaft 85 is a rotation shaft related to the change of the interval (inter-strain) of seedlings planted by the walking type rice transplanter 1.
The inter-stock transmission shaft 85 is rotatably supported by the mission case 23 and is accommodated in the mission case 23. In the present embodiment, spline grooves are formed on the outer peripheral surface of the inter-stock transmission shaft 85.

  The gear 85a is fixed to one end portion (left end portion) of the inter-shaft transmission shaft 85 so as not to be relatively rotatable and to be immovable in the axial direction (longitudinal direction) of the inter-shaft transmission shaft 85.

  The first inter-strain gear 86 is a spur gear related to the change of the interval (inter-strain) of seedlings planted by the walking type rice transplanter 1. The first stock gear 86 includes a large gear portion 86a and a small gear portion 86b.

The large gear portion 86a has a shape in which a disk-shaped portion forming a spur gear and a sleeve-shaped portion protruding from one disk surface of the disk-shaped portion are combined. The large gear portion 86a is formed with a through hole that penetrates the disk-shaped portion and the sleeve-shaped portion of the large gear portion 86a. The large gear portion 86a is formed with a plurality of engagement holes that penetrate a pair of disk surfaces of the disk-shaped portion.
The small gear portion 86b is a disk-shaped portion that forms a spur gear. The small gear portion 86b is formed with a through hole penetrating the disk-shaped portion of the small gear portion 86b. A sleeve-like portion of the large gear portion 86a is inserted in the through hole formed in the small gear portion 86b, and the small gear portion 86b is fixed to the large gear portion 86a so as not to be relatively rotatable by welding.

The inter-stock transmission shaft 85 passes through the through-hole formed in the large gear portion 86 a, so that the first inter-stock gear 86 is inserted in the substantially central portion of the inter-stock transmission shaft 85.
The first inter-shaft gear 86 that penetrates the inter-shaft transmission shaft 85 can rotate relative to the inter-shaft transmission shaft 85.
In addition, since the left and right ends of the first inter-shaft gear 86 that is inserted through the inter-shaft transmission shaft 85 abuts on a ring that is fitted on the inter-shaft transmission shaft 85, the first inter-shaft gear 86 is in the axial direction of the inter-shaft transmission shaft 85. Is immovable.
The large gear portion 86a of the first inter-stock gear 86 inserted through the inter-stock transmission shaft 85 meshes with the gear 73c.

The second inter-gear gear 87 is a spur gear related to the change of the interval (inter-strain) of seedlings planted by the walking type rice transplanter 1. The second inter-gear gear 87 is formed with a through hole penetrating a pair of board surfaces.
Further, the second inter-gear gear 87 is formed with a plurality of engagement holes penetrating the pair of board surfaces.
The inter-company transmission shaft 85 passes through a through hole formed in the second inter-company gear 87, so that the second inter-company gear 87 is inserted into the right end portion of the inter-company transmission shaft 85.
The second inter-gear gear 87 can rotate relative to the inter-gear transmission shaft 85 and cannot move in the axial direction of the inter-gear transmission shaft 85.
A second inter-gear gear 87 inserted through the inter-shaft transmission shaft 85 meshes with the gear 73f.

The inter-strain transmission gear 88 is a spur gear related to the change of the interval (inter-strain) of seedlings planted by the walking type rice transplanter 1.
The stock transmission gear 88 is formed with a through hole penetrating a pair of left and right panel surfaces, and a spline groove is formed on the inner peripheral surface of the through hole. A plurality of engaging projections are formed on the pair of left and right panel surfaces of the inter-stock transmission gear 88, respectively.

The inter-company transmission shaft 85 passes through the through-hole formed in the inter-company transmission gear 88, whereby the inter-company transmission gear 88 is inserted into the inter-company transmission shaft 85.
When the inter-shaft transmission gear 88 is inserted into the inter-shaft transmission shaft 85, the spline groove formed in the through-hole of the inter-shaft transmission gear 88 and the spline groove formed in the inter-shaft transmission shaft 85 are engaged, so The gear 88 is not rotatable relative to the inter-company transmission shaft 85 and is movable in the axial direction (longitudinal direction) of the inter-company transmission shaft 85.
When the inter-company transmission gear 88 is inserted into the inter-company transmission shaft 85, the inter-company transmission gear 88 is disposed at a position sandwiched between the first inter-company gear 86 and the second inter-company gear 87.

The planting clutch shaft 89 is a rotating shaft for transmitting driving force to the planting device 5 and the seedling supply device 6.
The planting clutch shaft 89 is rotatably supported by the mission case 23.
A midway portion of the planting clutch shaft 89 is accommodated in the mission case 23, and one end portion (left end portion) and the other end portion (right end portion) of the planting clutch shaft 89 project to the left side and right side of the mission case 23, respectively.
Two ring-shaped grooves are formed in the left half of the planting clutch shaft 89 with a space between each other, and two rings are fitted on the two grooves. In addition, a spline groove is formed on the outer peripheral surface of the planting clutch shaft 89 in the portion from the right-side groove to the center of the planting clutch shaft 89 among the two ring-shaped grooves formed in the left half of the planting clutch shaft 89. It is formed.

  The bevel gear 89 a is fixed to the middle portion of the planting clutch shaft 89 so as not to be relatively rotatable and to be immovable in the axial direction of the planting clutch shaft 89.

The planting clutch 90 is a clutch for switching whether to transmit driving force to the planting device 5 and the seedling supply device 6.
The planting clutch 90 of this embodiment includes a planting clutch gear 90a, a planting clutch pawl 90b, and a planting clutch spring 90c.

The planting clutch gear 90a is a spur gear. The planting clutch gear 90a is formed with a through hole penetrating a pair of board surfaces. By passing the planting clutch shaft 89 through a through-hole formed in the planting clutch gear 90 a, the planting clutch gear 90 a is penetrated into the left half of the planting clutch shaft 89 and accommodated in the mission case 23.
An engagement portion is formed on the right panel surface of the planting clutch gear 90 a that is inserted through the planting clutch shaft 89.
The planting clutch gear 90a is disposed at a position sandwiched between two rings that are externally fitted to the left half of the planting clutch shaft 89, and the left and right panel surfaces of the planting clutch gear 90a abut against the two rings. Therefore, the planting clutch gear 90 a penetrating the planting clutch shaft 89 can rotate relative to the planting clutch shaft 89 and cannot move in the axial direction of the planting clutch shaft 89.

The planting clutch claw 90b is a substantially cylindrical member. The planting clutch claw 90b is formed with a through hole penetrating a pair of left and right end surfaces, and a spline groove is formed on the inner peripheral surface of the through hole.
An engaging portion is formed on the left end surface of the planting clutch pawl 90b.
By passing the planting clutch shaft 89 through the through-hole formed in the planting clutch pawl 90 b, the planting clutch pawl 90 b is inserted into the planting clutch shaft 89.

When the planting clutch pawl 90b is inserted into the planting clutch shaft 89, the planting clutch pawl 90b is disposed at a position on the right side of the planting clutch gear 90a (a position sandwiched between the planting clutch gear 90a and the bevel gear 89a).
Further, when the planting clutch pawl 90 b is inserted through the planting clutch shaft 89, the spline groove formed in the through hole of the planting clutch pawl 90 b and the spline groove formed in the planting clutch shaft 89 are engaged.
Therefore, the planting clutch pawl 90 b is not rotatable relative to the planting clutch shaft 89 and is movable in the axial direction (longitudinal direction) of the planting clutch shaft 89.

The planting clutch spring 90c is a member that urges the planting clutch pawl 90b in a direction approaching the planting clutch gear 90a (left side in this embodiment). The planting clutch spring 90 c according to the present embodiment is a metal winding spring and penetrates the planting clutch shaft 89.
When the planting clutch spring 90c is inserted into the planting clutch shaft 89, one end (right end) of the planting clutch spring 90c abuts on the left end surface of the bevel gear 89a, and the other end (left end) of the planting clutch spring 90c is It contacts the right end surface of the planting clutch claw 90b.

As shown in FIG. 7, when the planting clutch pawl 90b is moved to the left side (direction approaching the planting clutch gear 90a) by the urging force of the planting clutch spring 90c, the engaging portion formed in the planting clutch gear 90a and the planting clutch The engaging portion formed on the claw 90b is engaged, and the planting clutch gear 90a is connected to the planting clutch claw 90b so as not to rotate relative thereto.
As a result, the planting clutch gear 90a and the planting clutch pawl 90b rotate integrally, and the driving force can be transmitted to the planting device 5 and the seedling supply device 6.

By applying an external force to the planting clutch pawl 90b (in this embodiment, the planting clutch fork 174a (see FIG. 7) engages the planting clutch pawl 90b), the planting clutch pawl 90b resists the urging force of the planting clutch spring 90c. The engagement portion formed on the planting clutch gear 90a and the engagement portion formed on the planting clutch pawl 90b are released when the rightward movement (direction away from the planting clutch gear 90a) is released. The planting clutch gear 90a can rotate relative to the planting clutch pawl 90b.
As a result, the planting clutch gear 90a and the planting clutch pawl 90b do not rotate integrally, and the driving force cannot be transmitted to the planting device 5 and the seedling supply device 6.

  In this way, by changing the position of the planting clutch pawl 90b (moving leftward or rightward), the planting clutch gear 90a and the planting clutch pawl 90b are connected so as not to be relatively rotatable (planting clutch gear). It is possible to switch whether or not the driving force can be transmitted from 90a to the planting clutch shaft 89 via the planting clutch pawl 90b.

The center planting transmission shaft 91 is a rotation shaft related to transmission of driving force to the center left planting arm 51L and the center right planting arm 51R in the planting device 5.
As shown in FIG. 6, the center planting transmission shaft 91 is accommodated in the center frame 24.
One end portion (front end portion) of the central planting transmission shaft 91 is rotatably supported by the rear end portion of the transmission case 23, and the other end portion (rear end portion) of the central planting transmission shaft 91 is the front end portion of the central planting case 27C. It is pivotally supported by the shaft.

  The bevel gear 91 a is fixed to one end portion (front end portion) of the central planting transmission shaft 91 so as not to be relatively rotatable, and is accommodated in the mission case 23. The bevel gear 91a meshes with the bevel gear 89a.

  The bevel gear 91b is fixed to the other end portion (rear end portion) of the central planting transmission shaft 91 so as not to be relatively rotatable, and is accommodated in the central planting case 27C.

The center planting arm shaft 92 is a rotation shaft related to transmission of driving force to the center left planting arm 51L and the center right planting arm 51R in the planting device 5.
The central planting arm shaft 92 is rotatably supported by the central planting case 27C. One end portion (left end portion) and the other end portion (right end portion) of the center planting arm shaft 92 protrude to the left side and the right side of the center planting case 27C, respectively. The middle part of the central planting arm shaft 92 is accommodated in the central planting case 27C.
A central left planting arm 51L and a central right planting arm 51R are connected to one end (left end) and the other end (right end) of the central planting arm shaft 92, respectively.

The left planting transmission shaft 93 </ b> L is a rotation shaft related to transmission of driving force to the left planting arm portion 52 </ b> L in the planting device 5.
One end portion (right end portion) of the left planting transmission shaft 93L is connected to one end portion (left end portion) of the planting clutch shaft 89 so as not to be relatively rotatable.
The left planting transmission shaft 93L extends from one end of the left side frame 26L (the end fixed to the left side surface of the transmission case 23) to the bent portion (the part corresponding to the joint member of the left side frame 26L). Be contained.
The other end portion (left end portion) of the left planting transmission shaft 93L is rotatably supported by a bent portion of the left side frame 26L.

  The bevel gear 94L is fixed to the other end portion (left end portion) of the left planting transmission shaft 93L so as not to be relatively rotatable, and is accommodated in a bent portion of the left side frame 26L.

The left rear transmission shaft 95 </ b> L is a rotation shaft related to transmission of driving force to the left planting arm portion 52 </ b> L in the planting device 5.
Of the left rear transmission shaft 95L, the portion from one end (front end) to the middle is from the bent portion of the left side frame 26L to the other end (the end fixed to the front end of the left planting case 27L). The other end (rear end) of the left rear transmission shaft 95L is housed in the left planting case 27L.
One end portion (front end portion) of the left rear transmission shaft 95L is rotatably supported by a bent portion of the left side frame 26L, and the other end portion (rear end portion) of the left rear transmission shaft 95L is rotatable to the left planting case 27L. Is pivotally supported.

The bevel gear 96L is fixed to one end portion (front end portion) of the left rear transmission shaft 95L so as not to be relatively rotatable, and is accommodated in a bent portion of the left side frame 26L. The bevel gear 96L meshes with the bevel gear 94L.
The bevel gear 97L is fixed to the other end portion (rear end portion) of the left rear transmission shaft 95L so as not to be relatively rotatable, and is accommodated in the left planting case 27L.

The left planting arm shaft 98 </ b> L is a rotation shaft related to transmission of driving force to the left planting arm portion 52 </ b> L in the planting device 5.
The left planting arm shaft 98L is rotatably supported by the left planting case 27L. One end portion (right end portion) of the left planting arm shaft 98L protrudes to the right side of the left planting case 27L, and the remaining portion is accommodated in the left planting case 27L.
The left planting arm portion 52L is connected to one end portion (right end portion) of the left planting arm shaft 98L.

  The bevel gear 99L is fixed to the other end portion (left end portion) of the left planting arm shaft 98L so as not to be relatively rotatable, and is accommodated in the left planting case 27L. The bevel gear 99L meshes with the bevel gear 97L.

The right planting transmission shaft 93 </ b> R is a rotation shaft related to transmission of driving force to the right planting arm portion 52 </ b> R in the planting device 5.
One end portion (left end portion) of the right planting transmission shaft 93R is connected to the other end portion (right end portion) of the planting clutch shaft 89 so as not to be relatively rotatable.
The right planting transmission shaft 93R extends from one end of the right side frame 26R (the end fixed to the right side surface of the transmission case 23) to the bent portion (the part corresponding to the joint member of the right side frame 26R). Be contained.
The other end portion (right end portion) of the right planting transmission shaft 93R is rotatably supported by the bent portion of the right side frame 26R.

  The bevel gear 94R is fixed to the other end portion (right end portion) of the right planting transmission shaft 93R so as not to be relatively rotatable, and is accommodated in a bent portion of the right side frame 26R.

The right rear transmission shaft 95 </ b> R is a rotation shaft related to transmission of driving force to the right planting arm portion 52 </ b> R in the planting device 5.
The portion of the right rear transmission shaft 95R from one end (front end) to the middle is from the bent portion of the right side frame 26R to the other end (the end fixed to the front end of the right planting case 27R). The other end (rear end) of the right rear transmission shaft 95R is housed in the right planting case 27R.
One end portion (front end portion) of the right rear transmission shaft 95R is rotatably supported by a bent portion of the right side frame 26R, and the other end portion (rear end portion) of the right rear transmission shaft 95R is rotatable to the right planting case 27R. Is pivotally supported.

The bevel gear 96R is fixed to one end portion (front end portion) of the right rear transmission shaft 95R so as not to be relatively rotatable, and is accommodated in a bent portion of the right side frame 26R. The bevel gear 96R meshes with the bevel gear 94R.
The bevel gear 97R is fixed to the other end portion (rear end portion) of the right rear transmission shaft 95R so as not to rotate relative to the right rear transmission shaft 95R, and is accommodated in the right planting case 27R.

The right planting arm shaft 98 </ b> R is a rotation shaft related to transmission of driving force to the right planting arm portion 52 </ b> R in the planting device 5.
The right planting arm shaft 98R is rotatably supported by the right planting case 27R. One end portion (left end portion) of the right planting arm shaft 98R protrudes to the left side of the right planting case 27R, and the remaining portion is accommodated in the right planting case 27R.
The right planting arm portion 52R is connected to one end portion (left end portion) of the right planting arm shaft 98R.

  The bevel gear 99R is fixed to the other end portion (right end portion) of the right planting arm shaft 98R so as not to be relatively rotatable, and is accommodated in the right planting case 27R. The bevel gear 99R meshes with the bevel gear 97R.

Hereinafter, a transmission path of driving force from the engine 3 to the left wheel 4L and a transmission path of driving force from the engine 3 to the right wheel 4R will be described.
As shown in FIG. 6, the driving force generated in the engine 3 is transmitted to the main shaft 73 through the output shaft 3a, the pulley 72a, the belt 72c, and the pulley 72b.

  The transmission path of the driving force from the main shaft 73 to the transmission shaft 74 is changed by changing the position of the transmission gear 75 with respect to the transmission shaft 74.

When the transmission gear 75 moves from the left to the first position (position on the leftmost side), the small gear portion 75a of the transmission gear 75 meshes with the gear 73a.
In this case, in this embodiment, “second forward speed (driving force transmission path when the walking type rice transplanter 1 travels forward at high speed)” is selected, and the driving force transmitted to the main shaft 73 is the main shaft 73. To the transmission shaft 74 through the gear 73a and the transmission gear 75.

When the transmission gear 75 moves to the second position from the left (the position adjacent to the right of the first position from the left), the large gear portion 75b of the transmission gear 75 meshes with the gear 73b.
In this case, in this embodiment, “first forward speed (driving force transmission path when walking type rice transplanter 1 travels at a low speed)” is selected, and the driving force transmitted to the main shaft 73 is the main shaft 73. Is transmitted to the transmission shaft 74 through the gear 73b and the transmission gear 75.

When the transmission gear 75 moves to the third position from the left (the position adjacent to the right from the second position from the left), the transmission gear 75 does not mesh with either the gear 73a or the gear 73b.
In this case, in this embodiment, “neutral (driving force transmission path when the walking type rice transplanter 1 does not travel)” is selected, and the driving force transmitted to the main shaft 73 is transmitted from the main shaft 73 to the transmission shaft 74. Not.

When the transmission gear 75 moves to the fourth position from the left (the position on the right side of the third position from the left, the rightmost position), the large gear portion 75b of the transmission gear 75 is the first inter-gear gear. It meshes with the small gear portion 86b of 86.
In this case, in this embodiment, “reverse (driving force transmission path when walking type rice transplanter 1 travels backward)” is selected, and the driving force transmitted to main shaft 73 is transmitted from main shaft 73 to gear 73c, It is transmitted to the transmission shaft 74 via the first stock gear 86 and the transmission gear 75.

  In this way, walking is performed by changing the position of the transmission gear 75 with respect to the transmission shaft 74 (selecting one of four positions from “first position from left” to “fourth position from left”). It is possible to switch the travel and stop of the type rice transplanter 1, the travel direction (forward and reverse), and the travel speed during forward travel (first forward speed and second forward speed).

The driving force transmitted to the transmission shaft 74 is transmitted from the transmission shaft 74 to the side clutch gear 77 via the gear 74a.
When the left side clutch shifter 79L is moving to the left side, the driving force transmitted to the side clutch gear 77 is balls 78L, 78L ..., left side clutch shaft 76L, sprocket 81L, chain 83L, sprocket 82L, left It is transmitted to the left wheel 4L via the axle 84L.
When the right side clutch shifter 79R moves to the right side, the driving force transmitted to the side clutch gear 77 is balls 78R, 78R,..., Right side clutch shaft 76R, sprocket 81R, chain 83R, sprocket 82R, right It is transmitted to the right wheel 4R via the axle 84R.

Below, the transmission path | route of the driving force from the engine 3 to the planting apparatus 5 and the transmission path | route of the driving force from the engine 3 to the seedling supply apparatus 6 are demonstrated.
As shown in FIG. 6, the driving force generated in the engine 3 is transmitted to the main shaft 73 through the output shaft 3a, the pulley 72a, the belt 72c, and the pulley 72b.

  The driving force transmission path from the main shaft 73 to the inter-shaft transmission shaft 85 is changed by changing the position of the inter-shaft transmission gear 88 with respect to the inter-shaft transmission shaft 85.

When the inter-company transmission gear 88 moves from the left to the first position (position on the leftmost side), a plurality of engaging protrusions formed on the left board surface of the inter-company transmission gear 88 are large gear portions of the first inter-company gear 86. The plurality of engagement holes formed in 86a are engaged with each other, and the inter-stock transmission gear 88 and the first inter-stock gear 86 are in a state in which they can rotate together (a state in which relative rotation is impossible).
In this case, in this embodiment, “first speed between strains (driving force transmission path when the interval between seedlings planted by walking type rice transplanter 1 (between strains) is the largest)” is selected and transmitted to the main shaft 73. The driving force is transmitted from the main shaft 73 to the inter-shaft transmission shaft 85 through the gear 73c, the first inter-shaft gear 86, and the inter-shaft transmission gear 88.

When the inter-variety transmission gear 88 moves to the second position from the left (position adjacent to the right of the first position from the left), the inter-variety transmission gear 88 meshes with the gear 73d.
In this case, in the present embodiment, the second speed between strains (the driving force transmission path when the interval between the seedlings planted by the walking type rice transplanter 1 (between the strains) is the second largest) is selected and transmitted to the main shaft 73. The driving force thus transmitted is transmitted from the main shaft 73 to the inter-shaft transmission shaft 85 through the gear 73d and the inter-shaft transmission gear 88.

When the inter-company transmission gear 88 is moved to the third position from the left (the position adjacent to the right of the second position from the left), the inter-company transmission gear 88 is moved to any of the gear 73c, the gear 73d, the gear 73e, and the gear 73f. Do not mesh.
In this case, in this embodiment, “neutral (driving force transmission path when the walking type rice transplanter 1 does not transmit the driving force to the planting device 5)” is selected, and the driving force transmitted to the main shaft 73 is the main shaft. 73 is not transmitted to the inter-stock transmission shaft 85.

When the inter-variety transmission gear 88 moves to the fourth position from the left (position adjacent to the right of the third position from the left), the inter-variety transmission gear 88 meshes with the gear 73e.
In this case, in this embodiment, the third speed between the strains (the driving force transmission path when the interval between the seedlings planted by the walking type rice transplanter 1 (between the strains) is the third largest) is selected and transmitted to the main shaft 73. The driving force thus transmitted is transmitted from the main shaft 73 to the inter-shaft transmission shaft 85 through the gear 73e and the inter-shaft transmission gear 88.

When the inter-shaft transmission gear 88 is moved to the fifth position from the left (the position that is the right-hand side of the fourth position from the left and the rightmost position), it is formed on the right side surface of the inter-shaft transmission gear 88. The plurality of engaging protrusions engage with the plurality of engaging holes formed in the second stock gear 87, so that the stock transmission gear 88 and the second stock gear 87 can rotate integrally (a state in which relative rotation is impossible). )
In this case, in this embodiment, “4th speed between strains (the driving force transmission path when the interval between seedlings planted by the walking type rice transplanter 1 (between strains) is the fourth largest (smallest))” is selected, The driving force transmitted to the main shaft 73 is transmitted from the main shaft 73 to the inter-shaft transmission shaft 85 through the gear 73f, the second inter-shaft gear 87, and the inter-shaft transmission gear 88.

  Thus, by changing the position of the inter-shaft transmission gear 88 with respect to the inter-shaft transmission shaft 85 (selecting one of the five positions from “first position from the left” to “the fifth position from the left”). It is possible to switch the interval (between strains) of seedlings planted by the walking type rice transplanter 1.

  When the planting clutch 90 is "ON" (when the engaging portion formed on the planting clutch gear 90a and the engaging portion formed on the planting clutch pawl 90b are engaged), the inter-strain transmission shaft 85 Is transmitted to the planting clutch shaft 89 via the gear 85a and the planting clutch 90.

The driving force transmitted to the planting clutch shaft 89 is transmitted to the central left planting arm 51L and the central right planting arm 51R via the bevel gear 89a, the bevel gear 91a, the central planting transmission shaft 91, the bevel gear 91b, the bevel gear 92a, and the central planting arm shaft 92. Communicated.
The driving force transmitted to the central planting arm shaft 92 is transmitted to the seedling supply device 6 (vertical feed device 62 and lateral feed device 63) via the sprocket 92b.

  The driving force transmitted to the planting clutch shaft 89 is transmitted to the left planting arm portion 52L via the left planting transmission shaft 93L, the bevel gear 94L, the bevel gear 96L, the left rear transmission shaft 95L, the bevel gear 97L, the bevel gear 99L, and the left planting arm shaft 98L. The

  The driving force transmitted to the planting clutch shaft 89 is transmitted to the right planting arm portion 52R via the right planting transmission shaft 93R, the bevel gear 94R, the bevel gear 96R, the right rear transmission shaft 95R, the bevel gear 97R, the bevel gear 99R, and the right planting arm shaft 98R. The

Hereinafter, the center float 10C, the left side float 10L, and the right side float 10R will be described with reference to FIGS. 1 to 4, 8, and 9. FIG.
The center float 10C, the left side float 10L, and the right side float 10R impart buoyancy to the walking type rice transplanter 1 (and thus prevent the walking type rice transplanter 1 from being buried in the paddy field). The center float 10C is an embodiment of the float according to the present invention.
The center float 10C, the left side float 10L, and the right side float 10R are substantially plate-like members extending in the front-rear direction. Spaces are formed in the center float 10C, the left side float 10L, and the right side float 10R, respectively, and air is sealed in these spaces.

  As shown in FIGS. 1 to 3, the center float 10 </ b> C is disposed at a position that is located at the center of the left and right sides of the machine body 2 and below.

As shown in FIGS. 1, 3 and 8, the rear end portion of the center float 10C is pivotally connected to a position which becomes the left and right central portion and the lower rear portion of the airframe 2 by a bracket 101C and a pin 102C.
More specifically, the bracket 101C is fixed to the upper surface of the rear end portion of the center float 10C. The pin 102 </ b> C is inserted through a portion that is the center of the left and right sides of the machine body 2 and the rear lower part (strictly speaking, the center part of the lower frame 171 a of the handle frame 171 fixed to the machine body 2 (see FIG. 18)) and the bracket 101 </ b> C.

The front end portion of the center float 10C is connected to a position that becomes the left and right center portion and the front lower portion of the airframe 2 by a bracket 103C, a float arm 104C, a pin 107C, and a pin 108C so as to be movable in a vertical direction (swingable).
More specifically, the bracket 103C is fixed to the upper surface of the front end portion of the center float 10C. A through hole 105C is formed at one end (lower end) of the float arm 104C, and a through long hole 106C is formed at a portion from the other end (upper end) to the middle of the float arm 104C. The pin 107C is inserted into the through hole formed in the through hole 105C and the bracket 103C, so that the front end portion of the center float 10C and one end portion (lower end portion) of the float arm 104C are rotatably connected.
The pin 108C is inserted into the through-hole 106C and the through-hole formed in the lower part of the bumper 22, so that the float arm 104C can slide (movable in the longitudinal direction of the float arm 104C) and can move with respect to the bumper 22. It is pivotally connected.

Thus, the center float 10 </ b> C is rotatable with respect to the body 2 of the walking type rice transplanter 1 around the pin 102 </ b> C.
Accordingly, the front end portion of the center float 10C is movable (swingable) in the vertical direction with respect to the body 2 of the walking type rice transplanter 1.

  As shown in FIGS. 1 to 4, the left side float 10 </ b> L is disposed at a position below the fuselage 2 and on the left rear side.

As shown in FIGS. 1, 3 and 9, the rear end portion of the left side float 10L is rotatably connected to a position which becomes the lower left rear portion of the airframe 2 by a bracket 101L and a pin 102L.
More specifically, the bracket 101L is fixed to the upper surface of the rear end portion of the left side float 10L. The pin 102 </ b> L is inserted into a portion that is the lower left rear portion of the body 2 (strictly speaking, a left end portion of the lower frame 171 a of the handle frame 171 fixed to the body 2 (see FIG. 18)) and the bracket 101 </ b> L.

The front end of the left side float 10L is connected to the front and rear center of the machine body 2 and the lower left position by the bracket 103L, the float arm 104L, the pin 107L and the left side float arm 108L. Is done.
More specifically, the bracket 103L is fixed to the upper surface of the front end portion of the left side float 10L. One end of the left side float arm 108L is fixed to a bent portion of the left side frame 26L. A through hole 105L is formed in one end portion (lower end portion) of the float arm 104L, and a through long hole 106L is formed in a portion from the other end portion (upper end portion) to the midway portion of the float arm 104L.
When the pin 107L is inserted into the through hole formed in the through hole 105L and the bracket 103L, the front end portion of the left side float 10L and the one end portion (lower end portion) of the float arm 104L are rotatably connected. .
When the other end of the left side float arm 108L is inserted into the through long hole 106C, the float arm 104L is slidable (movable in the longitudinal direction of the float arm 104L) and rotated with respect to the left side frame 26L. Connected as possible.

As described above, the left side float 10L is rotatable with respect to the body 2 of the walking type rice transplanter 1 around the pin 102L.
Accordingly, the front end portion of the left side float 10L is movable (swingable) in the vertical direction with respect to the machine body 2 of the walking type rice transplanter 1.

  As shown in FIGS. 1 to 4, the right side float 10 </ b> R is disposed at a position below the fuselage 2 and on the right rear side.

  As shown in FIGS. 1, 3, and 9, the rear end portion of the right side float 10R is pivotally connected to a position that becomes the lower right rear portion of the airframe 2 by a bracket 101R and a pin 102R.

  The front end portion of the right side float 10R is movably connected (movable) in the vertical direction to the position of the front and rear center portion of the airframe 2 and the lower right portion by the bracket 103R, the float arm 104R, the pin 107R, and the right side float arm 108R. Is done. A through hole 105R is formed in one end (lower end) of the float arm 104R, and a through long hole 106R is formed in a portion from the other end (upper end) to the middle of the float arm 104R.

Thus, the right side float 10R can be rotated around the pin 102R with respect to the body 2 of the walking type rice transplanter 1.
Therefore, the front end portion of the right side float 10R is movable (swingable) in the vertical direction with respect to the machine body 2 of the walking type rice transplanter 1.

Hereinafter, the structure of the pitching control mechanism 11 will be described with reference to FIGS. 10 to 14.
The pitching control mechanism 11 stabilizes the planting depth of the seedling by the walking type rice transplanter 1 by controlling the inclination of the body 2 of the walking type rice transplanter 1 in the front-rear direction and the height (vehicle height) of the body 2 with respect to the paddy field. Mechanism.
As shown in FIG. 10, the pitching control mechanism 11 of this embodiment includes a pump unit 110, a pitching sensor 120, a pitching cylinder 130, and a swing device 140.

  As shown in FIGS. 10 and 11, the pump unit 110 includes a casing 111, a hydraulic pump unit 112, a switching valve 113, relief valves 114 and 115, and pipes 116 and 117.

The casing 111 is a member constituting the main structure of the pump unit 110 and is manufactured by casting.
A first port 111 a and a second port 111 b are formed on the surface of the casing 111.
An oil pan 111c and oil passages 111d, 111e, 111f, 111g, 111h, 111i, and 111j are formed inside the casing 111.
The casing 111 is fixed to the upper surface of the front end portion of the engine base 21 (in front of the engine 3).

The hydraulic pump unit 112 pumps hydraulic oil for extending the pitching cylinder 130, which will be described in detail later, to the pitching cylinder 130.
The hydraulic pump unit 112 according to the present embodiment is formed inside the housing 111.
A front end portion (left end portion) of the input shaft 112a of the hydraulic pump unit 112 protrudes from the left side surface of the casing 111 fixed to the engine base 21, and a pulley 71b is fixed to the front end portion of the input shaft 112a.
When the driving force from the engine 3 is transmitted to the input shaft 112a, the input shaft 112a rotates and the hydraulic pump unit 112 is driven. As a result, the hydraulic pump unit 112 discharges (pressure feeds) the hydraulic oil sucked from the suction port 112b from the discharge port 112c.

The switching valve 113 is a valve that switches a pressure-feeding path of hydraulic oil that is pressure-fed by the hydraulic pump unit 112. The switching valve 113 of this embodiment is a spool valve and is housed in the housing 111.
The switching valve 113 has three ports, a first port 113a, a second port 113b, and a third port 113c.
The switching valve 113 moves (slids) in the longitudinal direction of the spool that constitutes the switching valve 113 with respect to the housing 111 (in the front-rear direction in this embodiment), so that (i) the third port 113c is closed. (Ii) a state where the first port 113a and the second port 113b are in communication with each other; (ii) a state where the second port 113b is closed and the first port 113a and the third port 113c are in communication; It is possible to switch to one of the three states in which the one port 113a is closed and the second port 113b and the third port 113c are in communication.

  The relief valves 114 and 115 are valves that operate (open) when a predetermined pressure or more is applied to the hydraulic oil flowing through the oil passage group inside the casing 111. The relief valves 114 and 115 of this embodiment are accommodated in the casing 111.

One end of the oil passage 111d is connected to the oil pan 111c, and the other end of the oil passage 111d is connected to the suction port 112b of the hydraulic pump unit 112.
One end of the oil passage 111 e is connected to the discharge port 112 c of the hydraulic pump unit 112, and the other end of the oil passage 111 e is connected to the first port 113 a of the switching valve 113.
One end of the oil passage 111f is connected to the second port 113b of the switching valve 113, and the other end of the oil passage 111f is connected to the first port 111a of the housing 111.
One end of the oil passage 111g is connected to the second port 111b of the casing 111, and the other end of the oil passage 111g is connected to the oil pan 111c.
One end of the oil passage 111h is connected to the third port 113c of the switching valve 113, and the other end of the oil passage 111h is connected to the middle portion of the oil passage 111g.
One end of the oil passage 111i is connected to the middle portion of the oil passage 111e, and the other end of the oil passage 111i is connected to the middle portion of the oil passage 111g.
One end portion of the oil passage 111j is connected to a middle portion of the oil passage 111f, and the other end portion of the oil passage 111j is connected to a middle portion of the oil passage 111g.
The relief valve 114 is disposed in the middle of the oil passage 111i. The relief valve 115 is disposed in the middle of the oil passage 111j.

One end of the pipe 116 is connected to the first port 111a of the casing 111, and the other end of the pipe 117 is connected to an oil passage 131b of the pitching cylinder 130 described in detail later.
One end of the pipe 117 is connected to an oil passage 131 c of the pitching cylinder 130 described in detail later, and the other end of the pipe 117 is connected to the second port 111 b of the casing 111.

The pitching sensor 120 detects the relative height (relative position in the vertical direction) of the front end portion of the center float 10 </ b> C with respect to the body 2, and consequently the relative height of the paddy field with respect to the body 2.
As shown in FIGS. 10 and 12, the pitching sensor 120 includes a sensor arm 121, a sensor roller 122, a sensor shaft 123, a rotation arm 124, a sensor spring 125, a sensor rod 126, and a switching arm 127.

  The sensor arm 121 is a rod-shaped member. The sensor arm 121 of the present embodiment is made of a metal round bar, and the portion from one end of the sensor arm 121 to the bent portion is perpendicular to the portion from the other end of the sensor arm 121 to the bent portion. Bend.

  The sensor roller 122 is a member that contacts the upper surface of the front end portion of the center float 10 </ b> C among the members constituting the pitching sensor 120. The sensor roller 122 of this embodiment is a cylindrical member, and is rotatably inserted into one end portion of the sensor arm 121.

The sensor shaft 123 is a shaft for rotatably supporting the sensor arm 121 on the body 2.
The other end portion of the sensor roller 122 is fixed to the left end portion of the sensor shaft 123 of this embodiment by welding, and the right end portion of the sensor shaft 123 is rotatably supported on the right side surface of the engine base 21.

  One end of the rotating arm 124 is fixed to the right end of the sensor shaft 123. The longitudinal direction of the rotation arm 124 fixed to the right end portion of the sensor shaft 123 (the direction of the line connecting the one end portion to the other end portion of the rotation arm 124) is perpendicular to the longitudinal direction (axial direction) of the sensor shaft 123. It is.

The sensor spring 125 is a spring that urges the sensor arm 121 to rotate in a direction in which the sensor roller 122 contacts the upper surface of the front end portion of the center float 10C.
The sensor spring 125 according to the present embodiment is a metal winding spring and penetrates the sensor shaft 123. One end of the sensor spring 125 is locked to the engine base 21, and the other end of the sensor spring 125 is locked to the middle part of the rotating arm 124.

  The sensor rod 126 is a rod-shaped member, and one end of the sensor rod 126 is rotatably connected to the other end of the rotating arm 124.

  One end of the switching arm 127 is rotatably supported on the right side surface of the casing 111. The other end of the sensor rod 126 is rotatably connected to the middle portion of the switching arm 127. The other end of the switching arm 127 is rotatably connected to one end of the switching valve 113.

The pitching cylinder 130 is a hydraulic cylinder for adjusting the inclination of the machine body 2 of the walking type rice transplanter 1 in the front-rear direction.
As shown in FIGS. 10 and 13, the pitching cylinder 130 includes a cylinder body 131 and a cylinder rod 132.

The cylinder body 131 is a cylindrical member, and one end portion (front end portion) of the cylinder body 131 is opened, and the other end portion (rear end portion) of the cylinder body 131 is closed.
As shown in FIG. 13, a male thread 131 a is formed at the other end of the cylinder body 131.
The cylinder main body 131 is fixed inside the engine base 21 by screwing a nut into a male screw part 131 a that is inserted into a through hole formed in a plate member that forms the rear surface of the engine base 21.
An oil passage 131b that connects the inner peripheral surface and the outer peripheral surface of the cylinder main body 131 is formed at the other end of the cylinder main body 131.
An oil passage 131 c that connects the inner peripheral surface and the outer peripheral surface of the cylinder main body 131 is formed at one end of the cylinder main body 131.

The cylinder rod 132 is a substantially cylindrical member that is slidably supported by the cylinder body 131.
One end portion (front end portion) of the cylinder rod 132 protrudes outside the cylinder body 131, and a portion from the middle portion of the cylinder rod 132 to the other end portion (rear end portion) is accommodated in the cylinder body 131.
An oil passage 132 a is formed in the cylinder rod 132. One end of the oil passage 132a opens to the rear end surface of the cylinder rod 132, and the other end of the oil passage 132a opens to the outer peripheral surface of the other end portion (rear end portion) of the cylinder rod 132.
When the cylinder rod 132 protrudes greatly forward of the cylinder body 131, the other end of the oil passage 132a and the oil passage 131c formed in the cylinder body 131 are connected.

The swing device 140 connects the left axle case 25L, the right axle case 25R, and the pitching cylinder 130, thereby rotating the left axle case 25L and the right axle case 25R according to the expansion / contraction of the pitching cylinder 130, and thus the left The wheel 4L and the right wheel 4R are swung in the vertical direction.
As shown in FIGS. 10 and 14, the swing device 140 includes a sliding arm 141, a left swing rod 142L, a right swing rod 142R, a swing arm shaft 143, a left swing arm 144L, a right swing arm 144R, a left swing bar 145L, and a right swing. A bar 145R, a left bracket 146L, and a right bracket 146R are provided.

The sliding arm 141 is a rod-shaped member, and the central portion of the sliding arm 141 is rotatably connected to one end of the cylinder rod 132.
One end portion (left end portion) and the other end portion (right end portion) of the slide arm 141 are formed in slide grooves 21a and 21a (left slide groove 21a on the left side and right side surfaces of the engine base 21, respectively, formed on the plate material. 13, and the right slide groove 21 a is not shown) and protrudes to the left and right sides of the engine base 21.

The left swing rod 142L and the right swing rod 142R are rod-shaped members.
One end (front end) of the left swing rod 142L is rotatably connected to one end (left end) of the sliding arm 141. One end (front end) of the right swing rod 142R is rotatably connected to the other end (right end) of the sliding arm 141.

The swing arm shaft 143 is a shaft for rotatably supporting the left swing arm 144L and the right swing arm 144R, which will be described in detail later, on the body 2.
The swing arm shaft 143 of the present embodiment is a round bar-like member, and penetrates the mission case 23. The swing arm shaft 143 penetrating the mission case 23 is fixed to the mission case 23 so as not to slide in the axial direction (left-right direction) of the swing arm shaft 143. The left end portion and the right end portion of the swing arm shaft 143 penetrating the mission case 23 protrude to the left side and the right side of the mission case 23, respectively.

The left swing arm 144L and the right swing arm 144R are plate-like members bent in an L shape.
A bent portion of the left swing arm 144L (a portion bent in the middle of the left swing arm 144L) is rotatably inserted in the left end portion of the swing arm shaft 143. One end of the left swing arm 144L (the end that protrudes generally downward) is rotatably connected to the other end (rear end) of the left swing rod 142L.
The bent portion of the right swing arm 144R is rotatably inserted into the right end portion of the swing arm shaft 143. One end of the right swing arm 144R (the end that protrudes generally downward) is rotatably connected to the other end (rear end) of the right swing rod 142R.

The left swing bar 145L and the right swing bar 145R are rod-shaped members.
One end portion (upper end portion) of the left swing bar 145L is rotatably connected to the other end portion of the left swing arm 144L (an end portion that protrudes substantially rearward).
One end portion (upper end portion) of the right swing bar 145R is rotatably connected to the other end portion (the end portion that protrudes substantially rearward) of the right swing arm 144R.

The left bracket 146L is fixed at a position that is the front and rear halfway and upper part of the left axle case 25L. The other end (lower end) of the left swing bar 145L is rotatably connected to the left bracket 146L.
The right bracket 146R is fixed to a position that is an intermediate part and an upper part of the right axle case 25R. The other end (lower end) of the right swing bar 145R is rotatably connected to the right bracket 146R.

  Hereinafter, the operation of the pitching control mechanism 11 will be described with reference to FIGS. 10 to 14.

  As shown in FIG. 10, when the height (position in the vertical direction) of the airframe 2 relative to the paddy field (the surface thereof) is appropriate (the height at which the planting depth is set), the relative position of the front end portion of the center float 10C with respect to the airframe 2 The height (relative position in the vertical direction) is in an appropriate range set in advance. At this time, the rotation angle of the pitching sensor 120 that contacts the upper surface of the front end portion of the center float 10C (the angle formed by the longitudinal direction of the machine body 2 and the longitudinal direction of the sensor arm 121) falls within a predetermined range.

When the rotation angle of the pitching sensor 120 is within a predetermined range set in advance, the switching valve 113 (ii) closes the second port 113b and connects the first port 113a and the third port 113c. Held in a state.
As a result, the hydraulic pump 112 sucks the oil pan 111c through the oil passage 111d and the suction port 112b, and the hydraulic oil discharged from the discharge port 112c is the oil passage 111e, the first port 113a of the switching valve 113, and the switching valve 113. The third port 113c, the oil passage 111h, and the oil passage 111g are returned to the oil pan 111c.
In addition, hydraulic oil present in the oil passage 111f, the first port 111a, the piping 116, the oil passage 131b, and the pitching cylinder 130 from the second port 113b of the switching valve 113 is sealed by closing the second port 113b. Is done.
Therefore, the rotation angle of the left axle case 25L and the right axle case 25R with respect to the body 2 and, in turn, the vertical position (height) of the left wheel 4L and the right wheel 4R with respect to the body 2 are kept constant.

When the position of the airframe 2 with respect to (the surface of) the paddy field is too low, the buoyancy (or the pushing force by the mud or the reaction force from the water surface by the forward movement) that the center float 10C receives from the paddy field increases, and the front end of the center float 10C Moves upward.
As a result, the relative height (relative position in the vertical direction) of the front end portion of the center float 10C with respect to the airframe 2 deviates from a preset appropriate range and becomes higher than the preset proper range ( The front end of the center float 10C approaches the airframe 2).
At this time, the sensor roller 122 contacting the upper surface of the front end portion of the center float 10C is lifted upward, and the sensor arm 121, the sensor shaft 123, and the rotating arm 124 are counterclockwise when viewed from the left side against the urging force of the sensor spring 125. The rotation angle of the pitching sensor 120 deviates from a preset predetermined range (becomes smaller than the preset predetermined range).
Then, the sensor rod 126 is pulled rearward, the switching arm 127 is rotated counterclockwise in the left side view, the switching valve 113 is moved rearward, and (i) the third port 113c is closed and the first is closed. The port 113a and the second port 113b are kept in communication.
As a result, the hydraulic pump 112 sucks the oil pan 111c through the oil passage 111d and the suction port 112b, and the hydraulic oil discharged from the discharge port 112c is the oil passage 111e, the first port 113a of the switching valve 113, and the switching valve 113. The second port 113b, the oil passage 111f, the first port 111a, the pipe 116, and the oil passage 131b are pressure-fed into the pitching cylinder 130.

  When the hydraulic oil is pumped into the pitching cylinder 130, the pitching cylinder 130 extends (the cylinder rod 132 protrudes forward), and the sliding arm 141 is pushed forward along the sliding grooves 21a and 21a. The left swing rod 142L and the right swing rod 142R are drawn forward, the left swing arm 144L and the right swing arm 144R rotate clockwise in the left side view, and the left swing bar 145L and the right swing bar 145R are pushed downward. The left axle case 25L and the right axle case 25R rotate clockwise as viewed from the left side, and the left wheel 4L and the right wheel 4R are pushed downward with respect to the airframe 2.

  When the left wheel 4L and the right wheel 4R are pushed downward with respect to the body 2, the rear part of the body 2 is raised, and the position of the body 2 with respect to the paddy field (the surface thereof) returns to an appropriate state.

  When the other end of the oil passage 132a and the oil passage 131c formed in the cylinder body 131 are connected by the extension of the pitching cylinder 130, the hydraulic oil pumped into the pitching cylinder 130 is oil passage 132a, oil Since it returns to the oil pan 111c through the path 131c, the pipe 117, the second port 111b, and the oil path 111g, the pitching cylinder 130 does not extend any further.

When the position of the airframe 2 with respect to (the surface of) the paddy field is too high, the buoyancy (or the pushing force by mud or the reaction force from the water surface by the forward movement) that the center float 10C receives from the paddy field decreases, and the front end of the center float 10C Moves down.
As a result, the relative height (relative position in the vertical direction) of the front end portion of the center float 10C with respect to the airframe 2 deviates from a preset appropriate range and is lower than the preset proper range ( The front end of the center float 10C is separated from the airframe 2).
At this time, the sensor roller 122 that contacts the upper surface of the front end portion of the center float 10C moves downward by the urging force of the sensor spring 125, and the sensor arm 121, the sensor shaft 123, and the rotating arm 124 rotate clockwise when viewed from the left side. Thus, the rotation angle of the pitching sensor 120 deviates from a preset predetermined range (becomes larger than the preset predetermined range).
Then, the sensor rod 126 is pushed forward, the switching arm 127 rotates clockwise as viewed from the left side, the switching valve 113 moves forward (iii), the first port 113a is closed, and the second port The state in which 113b and the third port 113c are communicated is maintained.

  When the first port 113a is closed, the hydraulic pump section 112 sucks the oil from the oil pan 111c through the oil passage 111d and the suction port 112b, and is discharged from the discharge port 112c to reach the oil passage 111e. As a result, the relief valve 114 is actuated (opened). Accordingly, the hydraulic oil that has reached the oil passage 111e is returned to the oil pan 111c through the oil passage 111i and the oil passage 111g.

By communicating the second port 113b and the third port 113c, the left wheel 4L and the right wheel 4R are pushed upward with respect to the body 2 by the weight of the body 2, and the left axle case 25L and the right axle case 25R are The left swing bar 145L and the right swing bar 145R are pushed upward in the left side view, the left swing arm 144L and the right swing arm 144R are rotated counterclockwise in the left side view, and left The swing rod 142L and the right swing rod 142R are attracted rearward, the slide arm 141 is attracted rearward along the slide grooves 21a and 21a, and the pitching cylinder 130 contracts (the cylinder rod 132 is retracted rearward).
Thus, when the left wheel 4L and the right wheel 4R are pushed up by the weight of the airframe 2 with respect to the airframe 2, the rear part of the airframe 2 is lowered, and the position of the airframe 2 with respect to the paddy field (the surface thereof) is in an appropriate state. Return to.

  When the pitching cylinder 130 contracts, the hydraulic oil inside the pitching cylinder 130 flows into the oil passage 131b, the pipe 116, the first port 111a, the oil passage 111f, the second port 113b of the switching valve 113, and the switching valve 113. The oil is returned to the oil pan 111c through the third port 113c, the oil passage 111h, and the oil passage 111g.

Below, the structure of the stand 15 is demonstrated using FIG.15, FIG.20 and FIG.21.
The stand 15 is an embodiment of the stand according to the present invention.
The stand 15 of this embodiment includes a stand bar 151, an operation arm unit 152, and a stand spring 153.
The stand bar 151 is formed into a crank shape by appropriately bending a metal round bar. The stand bar 151 includes a stand shaft portion 151a, a connecting portion 151b, a contact portion 151c, a connecting portion 151d, and a stand shaft portion 151e.

The stand shaft portions 151a and 151e are one embodiment of the stand shaft portion according to the present invention, and are portions forming the left end portion and the right end portion of the stand bar 151, respectively.
Since the axis of the stand shaft 151a and the axis of the stand shaft 151e of the present embodiment are aligned with each other, the combination of the stand shaft 151a and the stand shaft 151e substantially forms a single rotation shaft.

The connecting portion 151b is a portion that connects the right end portion of the stand shaft portion 151a and the left end portion of the contact portion 151c.
The connecting portion 151d is a portion that connects the left end portion of the stand shaft portion 151e and the right end portion of the contact portion 151c.
The axial direction (longitudinal direction) of the connecting portion 151b is perpendicular to the axial direction (longitudinal direction) of the stand shaft portion 151a. The axial direction (longitudinal direction) of the connecting portion 151d is perpendicular to the axial direction (longitudinal direction) of the stand shaft portion 151e. The axial direction (longitudinal direction) of the connecting portion 151b is parallel to the axial direction (longitudinal direction) of the connecting portion 151d.

The contact portion 151c is an embodiment of the contact portion according to the present invention. The contact portion 151c of the present embodiment is connected to the stand shaft portions 151a and 151e via the connecting portion 151b and the connecting portion 151d (substantially, the contact portion 151c is connected via the connecting portion 151b and the connecting portion 151d. It is fixed to the stand shafts 151a and 151e).
The axial direction (longitudinal direction) of the contact portion 151c is parallel to the axial direction (longitudinal direction) of the stand shaft portions 151a and 151e.

As shown in FIG. 15, the stand bar 151 is rotatably supported by the body 2.
More specifically, the stand shaft portion 151a is rotatably inserted in a shaft support hole 21c formed at a position in the front and rear central portion and the lower portion of the plate material forming the left side surface of the engine base 21, and the stand shaft portion 151e. Is pivotally inserted into a shaft support hole 21d formed at a position which is the front and rear center portion and the lower portion of the plate material forming the right side surface of the engine base 21, thereby the stand bar 151 (and thus the stand shaft portion 151a and (A combination of the stand shaft portion 151e) is pivotally supported at a position which is the front and rear central portion and the lower portion of the engine base 21 so as to be rotatable.

  In the present invention, it is only necessary to have a structure in which the stand shaft portion and the abutting portion rotate integrally when an external force (moment) acts on the stand shaft portion. The configuration in which 151e and the contact portion 151c are integrally formed is also included in the configuration in which the “contact portion is fixed to the stand shaft portion”.

The operation arm unit 152 includes a cylindrical portion 152a, a rotation angle restricting portion 152b, and an operation arm portion 152c.
The cylindrical part 152a is a substantially cylindrical member made of metal.
The rotation angle restricting portion 152b is a long and thin plate-like member made of metal, and a midway portion of the rotation angle restricting portion 152b is fixed to one end portion (right end portion) of the cylindrical portion 152a by welding. The longitudinal direction of the rotation angle restricting portion 152b fixed to the tube portion 152a is perpendicular to the axial direction of the tube portion 152a.
The operation arm portion 152c is an embodiment of the operation arm portion according to the present invention.
The operation arm portion 152c of the present embodiment is a metal elongated plate-like member, and one end portion of the operation arm portion 152c is fixed to the other end portion (left end portion) of the cylindrical portion 152a by welding. A through hole 152d is formed at the other end of the operation arm 152c.

The operation arm unit 152 is fixed to the left end portion of the stand bar 151 so as not to be relatively rotatable. More specifically, of the stand shaft portion 151a of the stand bar 151 pivotally supported by the engine base 21, the portion of the operation arm unit 152 that protrudes to the left side of the plate member that forms the left side surface of the engine base 21 is provided. The cylindrical part 152a is penetrated, and the cylindrical part 152a is fixed to the stand bar 151 so as not to be relatively rotatable by a split pin or the like.
As a result, the operation arm portion 152c is fixed to the stand shaft portions 151a and 151e so as not to be relatively rotatable.

The stand spring 153 is a member that biases the stand bar 151 about the stand shaft portions 151a and 151e in a direction in which the stand bar 151 rotates counterclockwise as viewed from the left side.
The stand spring 153 of the present embodiment is a metal winding spring, and penetrates the stand shaft portion 151e of the stand bar 151. One end of the stand spring 153 is locked to the connecting portion 151 d of the stand bar 151, and the other end of the stand spring 153 is locked to the engine base 21.

When an external force other than the urging force of the stand spring 153 does not act on the stand bar 151, the stand bar 151 rotates counterclockwise in the left side view with the urging force of the stand spring 153 around the stand shaft portions 151a and 151e.
When the stand bar 151 rotates counterclockwise as viewed from the left side until the contact portion 151c of the stand bar 151 is disposed behind the stand shafts 151a and 151e, the rotation angle restricting portion of the operation arm unit 152 is rotated. One end portion of 152b abuts on the upper surface of the flange portion 21e formed at the lower end portion of the plate member that forms the left side surface of the engine base 21, thereby restricting counterclockwise rotation in the left side view of the stand bar 151. .

  The posture of the stand 15 when the stand bar 151 is disposed at a position where the contact portion 151c of the stand bar 151 is disposed behind the stand shaft portions 151a and 151e is an embodiment of the retracted posture according to the present invention. It corresponds to.

When the position of the stand 15 is held in the “retracted position”, the contact portion 151 c of the stand bar 151 does not protrude below the lower end portion of the engine base 21 (above the lower end portion of the engine base 21. Therefore, the contact portion 151c does not contact (does not interfere with) the front end portion of the center float 10C.
Accordingly, the stand 15 when held in the “retracted posture” does not restrict (allow) the front end portion of the center float 10C to move upward.

By applying an external force to the stand bar 151, the stand bar 151 can be rotated clockwise in the left side view about the stand shaft portions 151a and 151e against the urging force of the stand spring 153. Is possible.
When the stand bar 151 rotates clockwise as viewed from the left side until the contact portion 151c of the stand bar 151 is disposed below the stand shaft portions 151a and 151e, the rotation angle restricting portion 152b of the operation arm unit 152 is rotated. When the other end of the abutment comes into contact with the upper surface of the flange 21e, the clockwise rotation of the stand bar 151 in the left side view is restricted.
The posture of the stand 15 when the stand bar 151 is disposed at a position where the contact portion 151c of the stand bar 151 is disposed below the stand shaft portions 151a and 151e is an embodiment of the regulation posture according to the present invention. It corresponds to.

When the posture of the stand 15 is held in the “regulatory posture”, the contact portion 151c of the stand bar 151 protrudes downward from the lower end portion of the engine base 21 (below the lower end portion of the engine base 21). Therefore, the contact portion 151c contacts (interfers with) the upper surface of the front end portion of the center float 10C.
Therefore, the stand 15 when held in the “restricted posture” restricts the front end portion of the center float 10C from moving upward.
When the front end portion of the center float 10C is in contact with the contact portion 151c of the stand 15 when held in the “restricted posture”, the rotation angle of the pitching sensor 120 of the pitching control mechanism 11 is set in advance. In addition, the relative positional relationship of each member is adjusted so as to fall within a predetermined range (the vertical positions of the left wheel 4L and the right wheel 4R with respect to the airframe 2 are kept constant).

  In this way, the stand 15 can rotate between the “regulatory posture” and the “retracted posture” by rotating about the stand shaft portions 151a and 151e.

  Below, the structure of the main clutch 16 is demonstrated using FIG.6, FIG.16 and FIG.17.

The main clutch 16 is one embodiment of the main clutch according to the present invention, and transmits and stops the driving force from the engine 3 to the “transmission of the walking type rice transplanter 1”.
The main clutch 16 of this embodiment shown in FIGS. 16 and 17 is a so-called belt tension type clutch, and includes a main clutch arm 161, a main clutch roller 162, an engagement arm 163, and a main clutch spring 164.

The main clutch arm 161 is an embodiment of the main arm portion according to the present invention.
The main clutch arm 161 of this embodiment includes an arm member 161a, a support shaft member 161b, and a tubular member 161c.
The arm member 161a is an elongated plate-like member made of metal. A through hole 161d is formed in the middle of the arm member 161a.
The support shaft member 161b is a generally cylindrical member made of metal. The support shaft member 161b is fixed to one end of the arm member 161a by welding.
The cylindrical member 161c is a substantially cylindrical member made of metal. The cylindrical member 161c is fixed to the other end of the arm member 161a by welding.
The cylindrical member 161c is penetrated by the rotating shaft 21b fixed to the plate | board material which comprises the left side surface of the engine stand 21 so that relative rotation is possible.
The main clutch arm 161 is rotatably supported by the machine body 2 by the cylindrical member 161c being inserted into the rotation shaft 21b so as to be relatively rotatable.

The main clutch roller 162 is an embodiment of the roller portion according to the present invention.
The main clutch roller 162 of this embodiment is a substantially cylindrical member, and a ring-shaped groove extending in the circumferential direction is formed on the outer peripheral surface of the main clutch roller 162. The main clutch roller 162 is inserted into the support shaft member 161b of the main clutch arm 161 so as to be relatively rotatable.
The main clutch roller 162 is rotatably inserted into the support shaft member 161b so that the main clutch roller 162 is rotatably supported at one end of the main clutch arm 161.

The engagement arm 163 is an embodiment of the engagement portion according to the present invention, and is an embodiment of the on / off member according to the present invention. In other words, the engagement arm 163 which is one embodiment of the engagement portion according to the present invention corresponds to one embodiment of the on / off member according to the present invention.
The engagement arm 163 of this embodiment is a substantially prismatic member, and one end of the engagement arm 163 is fixed to the cylindrical member 161c by welding and is provided on the main clutch 16.
The engaging arm 163 is formed with a through groove 163a and an engaging groove 163b.
The through groove 163a is a groove that penetrates from the front surface to the rear surface of the engagement arm 163 and opens to the lower surface of the engagement arm 163. A wire member 181 (more precisely, the inner wire 181b) described later passes through the through groove 163a. To penetrate.
The engagement groove 163 b is a groove that penetrates from the left side surface of the engagement arm 163 to the right side surface of the engagement arm 163 through the through groove 163 a and opens to the front surface of the engagement arm 163. The rear end portion of the engagement groove 163b has a bag shape, and is larger in the vertical direction than the front end portion of the engagement groove 163b (the portion opened to the front surface of the engagement arm 163).
When the engagement member 182 described later is accommodated in the engagement groove 163b, the engagement arm 163 engages with the engagement member 182 described later (see FIGS. 19, 20, and 21).

The main clutch spring 164 is an embodiment of the urging portion according to the present invention.
The main clutch spring 164 of this embodiment is a metal winding spring. One end of the main clutch spring 164 is engaged with a through hole 161d formed in the arm member 161a of the main clutch arm 161. The other end of the main clutch spring 164 is locked to a locking bar 29a extending from a pulley cover 29 fixed to the left side surface of the transmission case 23 to protect the pulley 72b.
The main clutch spring 164 urges the main clutch arm 161 to rotate clockwise around the rotation shaft 21b by the elastic force (biasing force) to be contracted. As a result, the main clutch roller 162 supported by one end of the main clutch arm 161 contacts the outer peripheral surface of the belt 72c.
When the main clutch roller 162 abuts on the outer peripheral surface of the belt 72c, the tension of the belt 72c increases, and the driving force can be transmitted from the pulley 72a to the pulley 72a via the belt 72c.

The main clutch arm 161 and the engagement arm 163 of this embodiment are separate members, and both are fixed by welding, but the present invention is not limited to this, and when an external force (moment) acts on the engagement portion Further, it is sufficient that the main arm portion and the engaging portion have a structure that rotates integrally.
That is, “the engaging portion is fixed to the main arm portion” includes “the main arm portion and the engaging portion are integrally formed”.

Hereinafter, the operation unit 17 will be described with reference to FIGS. 1 to 4 and FIGS. 18 to 21.
The operation unit 17 is for an operator to operate each unit of the walking type rice transplanter 1.
As shown in FIG. 2, the operation unit 17 includes a handle frame 171, a travel / stock shift lever 172, a left side clutch lever 173L, a right side clutch lever 173R, a planting clutch lever 174, a swing lever 175, a seedling amount adjustment lever 176, A clutch stand operation mechanism 180 is provided.

The handle frame 171 is a main structure of the operation unit 17 and is fixed to the rear part of the machine body 2.
As shown in FIGS. 1 to 4, the handle frame 171 includes a lower frame 171a, a center frame 171b, an upper frame 171c, a left side frame 171d, and a right side frame 171e.

The lower frame 171 a is a member that forms the lower part of the handle frame 171.
The lower frame 171a of the present embodiment is a metal elongated cylinder. One end portion (left end portion) of the lower frame 171a is fixed to the rear end portion of the left rear frame 28L. The other end (right end) of the lower frame 171a is fixed to the rear end of the right rear frame 28R.

The center frame 171b is a member that forms the center of the handle frame 171.
The center frame 171b of the present embodiment is a metal elongated rectangular tube.
One end portion (front end portion) of the center frame 171b is fixed to the rear end portion of the center planting case 27C, and the middle portion of the center frame 171b is fixed to the center portion (left and right center portion) of the lower frame 171a. The middle frame 171b is bent at a middle portion (a portion fixed to the middle portion of the lower frame 171a), and the middle frame 171b extends obliquely upward from the middle portion to the other end portion (rear end portion). . The other end portion (rear end portion) of the center frame 171b is disposed at a position behind the upper half portion of the rear surface of the seedling mount 61.

The upper frame 171c is a member that forms the upper part of the handle frame 171.
The upper frame 171c of the present embodiment is a metal elongated cylinder, and the longitudinal direction of both ends (one end and the other end) of the upper frame 171c is perpendicular to the longitudinal direction of the middle part of the upper frame 171c. It is bent at two places. A midway portion of the upper frame 171c is fixed to the other end portion of the central frame 171b.
When the midway portion of the upper frame 171c is fixed to the other end portion of the central frame 171b, the longitudinal direction of the midway portion of the upper frame 171c is parallel to the left-right direction, and one end portion (left end portion) and the other end portion of the upper frame 171c (Right end part) extends rearward of the middle part of the upper frame 171c. A grip for an operator to grip is attached to one end and the other end of the upper frame 171c.

The left side frame 171d is a member forming the left side of the handle frame 171.
The left side frame 171d of the present embodiment is a metal elongated cylinder. One end (lower end) of the left frame 171d is fixed to one end (left end) of the lower frame 171a. The other end portion (upper end portion) of the left side frame 171d is fixed to a boundary portion (left bent portion) between the one end portion and the midway portion of the upper frame 171c.

The right side frame 171e is a member that forms the right side of the handle frame 171.
The right side frame 171e of the present embodiment is a metal elongated cylinder. One end (lower end) of the right frame 171e is fixed to the other end (right end) of the lower frame 171a. The other end portion (upper end portion) of the right side frame 171e is fixed to a boundary portion (right bent portion) between the other end portion and the middle portion of the upper frame 171c.

The travel / stock shift lever 172 is a lever for performing a travel shift and a stock shift of the walking type rice transplanter 1.
The base end of the travel / stock shift lever 172 is rotatably supported by the airframe 2 (more specifically, the upper part of the central planting case 27C), and the distal end of the travel / stock speed change lever 172 (held by the operator). The portion) is arranged at a position in front of the upper half of the rear surface of the seedling mount 61.
The travel / stock shift lever 172 is connected to the transmission gear 75 and the stock transmission gear 88 of the transmission mechanism 7 via a link mechanism (not shown) (more specifically, the transmission gear 75 is moved in the axial direction of the transmission shaft 74). And a shifter for shifting the stock shift gear 88 in the axial direction of the stock shift shaft 85).
The operator can perform the traveling shift and the inter-shaft shift of the walking type rice transplanter 1 by turning the traveling / stock shifting lever 172 by holding the tip of the traveling / stock shifting lever 172 by hand.

  The left side clutch lever 173L and the right side clutch lever 173R are levers for operating the traveling direction of the walking type rice transplanter 1 (straight, left turn, and right turn).

The left side clutch lever 173L is rotatably supported on the lower portion of the left end portion of the upper frame 171c.
The left side clutch lever 173L is connected to the left side clutch shifter 79L (more specifically, the left side clutch hawk 173a (see FIG. 7)) via a link mechanism (not shown).
The operator holds the left side clutch lever 173L in a gripped state (holds the left side clutch lever 173L rotating upward), thereby moving the left side clutch shifter 79L to the right, and thus the engine. It is possible to stop the transmission of the driving force from 3 to the left wheel 4L.

The right side clutch lever 173R is rotatably supported on the lower portion of the right end portion of the upper frame 171c.
The right side clutch lever 173R is connected to a right side clutch shifter 79R (more specifically, a right side clutch hawk 173b (see FIG. 7)) via a link mechanism (not shown).
The operator holds the right side clutch lever 173R while holding it (holds the right side clutch lever 173R rotating upward), thereby moving the right side clutch shifter 79R to the left side, and thus the engine. It is possible to stop the transmission of the driving force from 3 to the right wheel 4R.

When the worker holds neither the left side clutch lever 173L nor the right side clutch lever 173R, the walking type rice transplanter 1 can go straight.
When the operator holds the left side clutch lever 173L and does not hold the right side clutch lever 173R, the walking type rice transplanter 1 can turn left.
When the operator holds the right side clutch lever 173R and does not hold the left side clutch lever 173L, the walking type rice transplanter 1 can turn right.
When the worker holds both the left side clutch lever 173L and the right side clutch lever 173R, the walking rice transplanter 1 cannot go straight.

The planting clutch lever 174 is a lever that switches whether to transmit driving force from the engine 3 to the planting device 5 and the seedling supply device 6.
The proximal end portion of the planting clutch lever 174 is rotatably supported at a position slightly to the right of the middle portion of the upper frame 171c “in a direction in which the distal end portion of the planting clutch lever 174 tilts in the front-rear direction”.
The proximal end portion of the planting clutch lever 174 is connected to the planting clutch pawl 90b of the planting clutch 90 via a link mechanism (not shown). More specifically, the proximal end portion of the planting clutch lever 174 is connected to the planting clutch hawk 174a (see FIG. 7) via a link mechanism (not shown).
The planting clutch hawk 174a changes the state of the planting clutch 90 to “ON (a state in which driving force can be transmitted from the engine 3 to the planting device 5 and the seedling supply device 6)” or “OFF” (the planting device 5 and the seedling from the engine 3). This is a member for switching to “a state in which the driving force cannot be transmitted to the supply device 6)”.
When the planting clutch hawk 174a is not engaged with the planting clutch pawl 90b, the state of the planting clutch 90 is held at “ON”.
When the planting clutch hawk 174a is engaged with the planting clutch pawl 90b, the state of the planting clutch 90 is maintained at “OFF”.
The operator turns the planting clutch lever 174 so that the tip of the planting clutch lever 174 tilts forward (turns the planting clutch lever 174 to “on”), thereby changing the state of the planting clutch 90 to “on”. It is possible to hold it.
The operator turns the planting clutch lever 174 so that the tip of the planting clutch lever 174 tilts backward (turns the planting clutch lever 174 to “OFF”), thereby changing the state of the planting clutch 90 to “OFF”. It is possible to hold it.

The swing lever 175 is a lever for operating the vehicle height of the walking type rice transplanter 1.
The base end portion of the swing lever 175 is rotatably supported at a position slightly on the right side of the upper frame 171c and next to the right of the planting clutch lever 174.
The base end of the swing lever 175 is connected to the switching arm 127 of the pitching sensor 120 of the pitching control mechanism 11 via a link mechanism (not shown).
The operator switches the state between “automatic swing”, “manual swing”, and “interlocked swing” by rotating the swing lever 175 so that the tip of the swing lever 175 tilts in the left-right direction. Is possible.

“Automatic swing” is a state in which the pitching control mechanism 11 controls the vehicle height of the walking type rice transplanter 1.
When the front end portion of the swing lever 175 is disposed at a position corresponding to “automatic swing” in the left-right direction, the pitching control mechanism 11 detects the relative position of the front end portion of the center float 10C relative to the airframe 2 detected by the pitching sensor 120. The vehicle height of the walking type rice transplanter 1 is controlled based on the “height”.

“Manual swing” is a state in which the adjustment of the vehicle height by the operator operating the swing lever 175 has priority over the vehicle height control by the pitching control mechanism 11.
When the tip of the swing lever 175 is disposed at a position corresponding to the “manual swing” in the left-right direction, the operator rotates the swing lever 175 so that the tip of the swing lever 175 tilts in the front-rear direction. Thus, the switching valve 113 of the pump unit 110 is moved with priority over the pitching sensor 120, and the left wheel 4L and the right wheel 4R are moved upward or downward with respect to the airframe 2 (the vehicle height is changed). Is possible.

In the “interlocking swing”, when the worker sets the planting clutch lever 174 to “on” (when the driving force can be transmitted from the engine 3 to the planting device 5 and the seedling supply device 6), the pitching control mechanism 11 is a walking type. When the vehicle height of the rice transplanter 1 is controlled and the operator turns the planting clutch lever 174 to “OFF”, the vehicle height is raised in conjunction with the operation.
The operator rotates the planting clutch lever 174 so that the distal end portion of the planting clutch lever 174 tilts backward when the distal end portion of the swing lever 175 is disposed at a position corresponding to the “interlocking swing” in the left-right direction. By doing so, “stop transmission of driving force from the engine 3 to the planting device 5 and the seedling supply device 6” and “rise of the vehicle height (the left wheel 4L and the right wheel 4R are moved upward with respect to the body 2). Can be performed in conjunction with each other.

The seedling amount adjustment lever 176 is a seedling amount, that is, a seedling mat on which the center left planting arm part 51L, the center right planting arm part 51R, the left planting arm part 52L, and the right planting arm part 52R are placed on the seedling mount 61. It is a lever for adjusting the number of seedlings (number of one stock) taken out at a time.
The base end portion of the seedling removal amount adjusting lever 176 is rotatably supported on the right side surface of the middle portion of the center frame 171b. The base end portion of the seedling removal amount adjusting lever 176 is connected to a seedling extraction plate (not shown) provided at the front end portion (lower end portion) of the seedling mounting table 61 via a link mechanism (not shown).
The operator can adjust the seedling removal amount by rotating the seedling removal amount adjustment lever 176 so that the tip of the seedling removal amount adjustment lever 176 tilts in the vertical direction.

Details of the main clutch / stand operation mechanism 180 will be described below with reference to FIGS. 2, 18, 19, 20, and 21.
The main clutch / stand operation mechanism 180 is an embodiment of the operation mechanism according to the present invention.
The main clutch / stand operation mechanism 180 is used to operate the stand 15 and the main clutch 16, and more precisely, used by an operator to operate the stand 15 and the main clutch 16.
As shown in FIG. 18, the main clutch / stand operation mechanism 180 includes a wire member 181, an engagement member 182, a spring member 187, and an operation member 190.

  The wire member 181 includes an outer wire 181a and an inner wire 181b.

The outer wire 181a is a tubular member having flexibility (can be elastically deformed).
One end (front end) of the outer wire 181a is fixed to the machine body 2, more specifically, to a bracket 24a (see FIG. 5) provided on the left side surface of the center frame 24.
The other end portion (rear end portion) of the outer wire 181a is fixed to the handle frame 171 and, more specifically, to a lever support member 171f provided at a position near the middle portion and the left end portion of the upper frame 171c.

The inner wire 181b is a string-like member having flexibility (can be elastically deformed).
The inner wire 181b of the present embodiment is formed by twisting a plurality of thin steel wires, and penetrates the outer wire 181a. The inner wire 181b penetrating the outer wire 181a is slidable with respect to the outer wire 181a (movable in the longitudinal direction of the outer wire 181a). The total length of the inner wire 181b is larger than the total length of the outer wire 181a.
One end portion (front end portion) of the inner wire 181b is fixed to one end portion (rear end portion) of the winding spring portion 187a of the spring member 187 described in detail later.
The other end portion (rear end portion) of the inner wire 181b is fixed to a lever arm 193 described in detail later.

The engaging member 182 is an embodiment of the engaging member according to the present invention.
As shown in FIG. 19, the engaging member 182 of this embodiment includes a bolt 183 and a nut 186.

The bolt 183 has a head portion 184 and a body portion 185.
The head portion 184 is a hexagonal columnar portion having a pair of end surfaces and six side surfaces.
The body portion 185 is a cylindrical portion protruding from one end face of the head portion 184. A male screw is formed on the outer peripheral surface of the body portion 185. A through-hole 185 a that penetrates the outer peripheral surface of the body portion 185 in the direction perpendicular to the axial direction of the body portion 185 is formed at the base end portion (the end portion connected to the head portion 184) of the body portion 185.

  The nut 186 is a hexagonal columnar member having a pair of end surfaces and six side surfaces. The nut 186 is formed with a through hole 186a that penetrates the pair of end surfaces. A female screw is formed on the inner peripheral surface of the through hole 186a.

The engaging member 182 is fixed to the middle part of the wire member 181.
More specifically, as shown in FIGS. 18 and 19B, the inner wire 181b of the wire member 181 is inserted into the through hole 185a formed in the body portion 185 of the bolt 183, and the nut 186 is attached to the bolt 183. By screwing, the engaging member 182 is fixed at a position in the middle of the inner wire 181b and closer to the front end.

The engagement member 182 engages with the engagement arm 163 of the main clutch 16.
More specifically, as shown in FIGS. 20 and 21, the engagement member 182 fixed at a position in the middle of the inner wire 181 b and closer to the front end is accommodated in an engagement groove 163 b formed in the engagement arm 163. Is done.
When the engaging member 182 is accommodated in the engaging groove 163b, the inner wire 181b penetrates the through groove 163a formed in the engaging arm 163 in the front-rear direction.

  Although the engaging member 182 of this embodiment includes the bolt 183 and the nut 186, the engaging member according to the present invention is not limited to this. That is, the engagement member according to the present invention may have another shape as long as the midway portion of the wire member can be engaged with the engagement portion of the main clutch.

As shown in FIG. 18, the spring member 187 is a metal winding spring having a winding spring portion 187a and a hook portion 187b.
The winding spring portion 187a is a portion of the spring member 187 that is formed in a spirally wound shape. One end portion (rear end portion) of the winding spring portion 187a is fixed to one end portion (front end portion) of the inner wire 181b.
The hook part 187b is a part connected to the other end of the winding spring part 187a. One end portion (rear end portion) of the hook portion 187b is connected to one end portion of the winding spring portion 187a, and the other end portion (front end portion) of the hook portion 187b is bent in a claw shape.
As shown in FIGS. 15, 20, and 21, the other end of the hook portion 187 b is fixed (locked) to a through hole 152 d formed in the operation arm portion 152 c of the operation arm unit 152 of the stand 15.

In the present embodiment, a combination of the outer wire 181a and inner wire 181b of the wire member 181 and the hook portion 187b of the spring member 187 corresponds to an embodiment of the wire member according to the present invention. The spring portion 187a corresponds to an embodiment of the spring member according to the present invention.
That is, as shown in FIGS. 20 and 21, the hook portion 187 b of the spring member 187 is fixed to the stand 15.
In addition, the winding spring portion 187a of the spring member 187 is a midway portion and engagement of the wire member of this embodiment (a combination of the outer wire 181a and inner wire 181b of the wire member 181 and the hook portion 187b of the spring member 187). It is provided at a position closer to one end (front end) of the wire member of the present embodiment than the member 182.

In the present embodiment, the hook portion 187b of the spring member 187 functions as part of one embodiment of the wire member according to the present invention, but the present invention is not limited to this.
For example, the hook portion 187b is formed in a short shape in the front-rear direction to substantially fix the front end portion of the winding spring portion 187a to the stand 15 and fix one end portion of the inner wire 181b to the rear end portion of the winding spring portion 187a. And you may fix the engaging member 182 to the middle part of the inner wire 181b.
That is, “the one end of the wire member is fixed to the stand and the spring member is provided in the middle of the wire member and closer to the one end of the wire member than the engaging member” The one end of the wire member is fixed to the stand, the one end of the wire member is fixed to the other end of the spring member, and the engaging member is fixed to the middle part of the wire member or one end of the wire member. It is.

The operation member 190 is an embodiment of the operation member according to the present invention, and is a portion that is touched by an operator when operating the stand 15 and the main clutch 16.
As shown in FIG. 18, the operation member 190 of this embodiment includes a main clutch lever 191, a main clutch pin 192, a lever arm 193, spacers 194a and 194b, and an arm pin 195.

The main clutch lever 191 is a part constituting the main structure of the operation member 190.
The main clutch lever 191 includes a rotating cylinder 191a, a lever body 191b, a grip 191c, a bracket 191d, and a roller 191e.

  The rotating cylinder 191a is a metal cylindrical member. A through-hole penetrating a pair of end surfaces is formed in the rotating cylinder 191a.

  The lever body 191b is a metal rod-shaped member. One end portion (base end portion) of the lever main body 191b is fixed to one end portion (left end portion) of the outer peripheral surface of the rotating cylinder 191a by welding.

The grip 191c is a member that forms a part that an operator grasps with his / her hand when operating the stand 15 and the main clutch 16.
The grip 191c of this embodiment is a cylindrical member whose one end made of a resin material is closed. The other end (tip) of the lever main body 191b is inserted into the opening of the grip 191c, whereby the grip 191c is fixed to the lever main body 191b.

The bracket 191d is a member that is bent at a right angle at a boundary line between one end portion and a middle portion of the elongated metal plate and a boundary line between the middle portion and the other end portion of the metal plate. One end and the other end of the metal plate constituting the bracket 191d are connected by a middle portion of the metal plate, and the plate surface of the one end of the metal plate constituting the bracket 191d and the plate surface of the other end are parallel to each other. opposite.
By fixing the middle part of the bracket 191d to the other end (right end) of the outer peripheral surface of the rotating cylinder 191a by welding, the bracket 191d is "the one end and the other end of the bracket 191d are the axis of the rotating cylinder 191a. It is fixed to the rotating cylinder 191a so as to protrude in a direction perpendicular to the direction.

  The roller 191e is a metal cylindrical member. The roller 191e is rotatably supported by the bracket 191d.

The main clutch pin 192 is a member that rotatably supports the main clutch lever 191 on the handle frame 171.
The main clutch pin 192 of the present embodiment is a substantially cylindrical member, and is rotatably inserted in the rotating cylinder 191a of the main clutch lever 191. The left and right ends of the main clutch pin 192 protrude from a pair of end surfaces of the rotating cylinder 191a and are pivotally supported by a lever support member 171f fixed at a position in the middle and to the left of the upper frame 171c of the handle frame 171.
The main clutch lever 191 supported by the lever support member 171f by the main clutch pin 192 can be rotated in the front-rear direction (in a direction in which the grip 191c of the main clutch lever 191 tilts forward and backward).

The lever arm 193 is a metal bar-shaped member. The lever arm 193 has a curved shape so that the midway portion protrudes upward (projects upward) from both end portions (front end portion and rear end portion) thereof.
The other end portion (rear end portion) of the inner wire 181b of the wire member 181 is fixed (connected) to one end portion (front end portion) of the lever arm 193.

  The spacers 194a and 194b are cylindrical members. Each of the spacers 194a and 194b is formed with a through-hole penetrating a pair of end surfaces.

The arm pin 195 is a member that rotatably supports the lever arm 193 on the handle frame 171.
The arm pin 195 of the present embodiment is a substantially cylindrical member, and is rotatably inserted into a through hole formed in the other end (rear end) of the lever arm 193 and a through hole formed in the spacers 194a and 194b. Is done. The left and right end portions of the arm pin 195 protrude from the left end portion of the spacer 194a and the right end portion of the spacer 194b, respectively, and are pivotally supported by the lever support member 171f at a position behind the position where the main clutch pin 192 is pivotally supported.
The lever arm 193 supported by the lever support member 171f by the arm pin 195 can rotate in the vertical direction (in the direction in which the front end portion of the lever arm 193 moves upward and downward).

  When the main clutch lever 191 and the lever arm 193 are rotatably supported by the handle frame 171, the lower surface of the lever arm 193 contacts the outer peripheral surface of the roller 191 e.

  The operation of the stand 15 and the main clutch 16 by the main clutch / stand operation mechanism 180 will be described below with reference to FIGS.

  In the present embodiment, the stand bar 151 is urged by the stand spring 153 in a direction to rotate counterclockwise as viewed from the left side, so that the combination of the spring member 187, the inner wire 181b, and the engaging member 182 is The stand spring 153 moves forward due to the urging force.

When the main clutch lever 191 is held in a forward tilted position, the lever arm 193 is in contact with the outer peripheral surface of the roller 191e and the front end of the lever arm 193 is rotated downward (counterclockwise when viewed from the left side). The spring member 187, the inner wire 181b, and the engaging member 182 are pulled forward by the urging force of the stand spring 153, and held in a state of moving forward. .
As a result, as shown in FIG. 20, the stand bar 151 is rotated counterclockwise as viewed from the left side by the biasing force of the stand spring 153, and the stand 15 is held in the “retracted posture”.
Further, when the engagement member 182 moves forward, the engagement arm 163 that engages with the engagement member 182, and thus the main clutch arm 161, the main clutch roller 162, and the engagement arm 163 are biased by the main clutch spring 164. To rotate clockwise in left side view.
As a result, the main clutch roller 162 abuts (presses) on the outer peripheral surface of the belt 72c, the tension of the belt 72c increases, and the main clutch 16 is "on". That is, the driving force can be transmitted from the pulley 72a to the pulley 72a via the belt 72c.

When the main clutch lever 191 is rotated in the direction of tilting backward from the posture tilted forward, the front end portion of the lever arm 193 is pushed upward by the roller 191e, and the lever arm 193 is rotated upward (viewed from the left side). To rotate clockwise).
By rotating the lever arm 193 upward, the other end portion (rear end portion) of the inner wire 181b is pulled upward as compared with the case where the main clutch lever 191 is held in a tilted position forward, and the spring member A combination of 187, inner wire 181 b and engagement member 182 is pulled backward (moves backward) against the biasing force of stand spring 153.
As a result, as shown in FIG. 21, the stand bar 151 rotates clockwise against the urging force of the stand spring 153 in the left side view, and the posture of the stand 15 is changed from the “retracted posture” to the “restricted posture”. Is done.
Further, when the engagement member 182 moves rearward, the engagement arm 163, and consequently the main clutch arm 161, the main clutch roller 162, and the engagement arm 163, are engaged with the engagement member 182 while being engaged with the main clutch. It rotates counterclockwise against the biasing force of the spring 164 when viewed from the left side.
As a result, the main clutch roller 162 is separated from the outer peripheral surface of the belt 72c, the tension of the belt 72c is reduced, and the main clutch 16 is turned off. That is, the driving force cannot be transmitted from the pulley 72a to the pulley 72a via the belt 72c, and the transmission of the driving force from the engine 3 to the transmission of the walking rice transplanter 1 is stopped.

As described above, the walking type rice transplanter 1 is
A stand 15 capable of changing the posture between a restriction posture that restricts the front end portion of the center float 10C from moving upward and a retracted posture that does not restrict the front end portion of the center float 10C from moving upward; ,
An on / off member (in this embodiment, an engagement arm 163) provided in the main clutch 16 that transmits and stops driving force from the engine 3 to the transmission;
A walking type rice transplanter equipped with a main clutch / stand operation mechanism 180 for operating
The main clutch / stand operation mechanism 180 is
A wire member whose one end (front end) is fixed to the stand 15 (in this embodiment, the outer wire 181a and inner wire 181b of the wire member 181 and the hook portion 187b of the spring member 187 are combined),
An engagement member 182 that is fixed to the middle part of the wire member and engages with an on / off member of the main clutch 16;
A spring member (in this embodiment, a wound spring portion 187a of the spring member 187) provided at a position closer to one end portion (front end portion) of the wire member than the middle portion of the wire member and the engaging member 182;
An operation member 190 connected to the other end (rear end) of the wire member;
Comprising
When the other end portion (rear end portion) of the wire member is pulled by operating the operation member 190 (in this embodiment, the main clutch lever 191 is rotated in the direction of tilting backward), the stand 15 is rotated. As a result, the position of the stand 15 is changed from the “retracted position” to the “regulated position”, and the on / off member of the main clutch 16 is engaged with the engaging member 182 while the main clutch 16 is in the opposite direction (viewed from the left side) By rotating (clockwise), transmission of the driving force to the transmission of the walking type rice transplanter 1 is stopped.
This configuration has the following advantages.
That is, it is possible to operate the main clutch 16 and the stand 15 in a linked manner with a simple structure (substantially one wire member) having a smaller number of parts than in the past.
In addition, the structure in which the main clutch 16 and the stand 15 are linked and operated is a simple structure (substantially one wire member) having a smaller number of parts compared to the conventional structure, thereby arranging the structure in a small space. This increases the degree of freedom in designing the walking rice transplanter 1.

When operating the operation member 190 in a state where the front end portion of the center float 10C has already moved upward under external force such as buoyancy from a paddy field (in this embodiment, the main clutch lever 191 is tilted backward) In the case of rotation), the stand 15 changes the posture of the stand 15 from the “retracted posture” to the “restricted posture” while pushing down the front end portion of the center float 10C downward. The body 2 of the walking type rice transplanter 1 is lifted by the operating force. In this case, a large force is required when operating the operation member 190.
However, in this embodiment, since the winding spring part 187a of the spring member 187 is provided in the middle part of the wire member and closer to one end part (front end part) of the wire member than the engaging member 182, the operation member 190 is provided. When operated (in this embodiment, when the main clutch lever 191 is rotated in the direction of tilting backward), the winding spring portion 187a of the spring member 187 is elastically deformed and stretched, so that the posture of the stand 15 becomes " The main clutch 16 is immediately (reliably) turned off while being held in the “retracted posture”.
As described above, the walking type rice transplanter 1 changes the posture of the stand 15 from the “retracted posture” to the “restricted posture” due to the fact that the front end portion of the center float 10C has already moved upward due to the external force. Therefore, when a large force is required, the main clutch 16 can be reliably switched from “ON” to “OFF” while maintaining the posture of the stand 15 in the “retracted posture”.

The stand 15 of the walking type rice transplanter 1 is
Stand shaft portions 151a and 151e that are pivotally supported by the body 2;
An abutment portion 151c fixed to the stand shaft portions 151a and 151e (via the coupling portions 151b and 151d) and abutting on the upper surface of the center float 10C in the “regulated posture”;
One end portion is fixed to the stand shaft portion 151a (via the tube portion 152a), and the other end portion is fixed to one end portion of the wire member (the hook portion 187b of the spring member 187).
Comprising
The main clutch 16 of the walking type rice transplanter 1 is
A main clutch arm 161 rotatably supported on the airframe 2;
A main clutch roller 162 rotatably supported at one end of the main clutch arm 161;
An engagement arm 163 fixed to the main clutch arm 161 and engaged with the engagement member 182;
A main clutch spring 164 that urges the main clutch arm 161 so that the main clutch roller 162 rotates in a direction in contact with a belt 72c that transmits driving force from the engine 3 to the transmission of the walking rice transplanter 1;
Comprising
The engagement arm 163 of the main clutch 16 corresponds to an on / off member of the walking type rice transplanter 1.

Below, the main clutch and stand operation mechanism 280 which is another embodiment of the operation mechanism of the walk type rice transplanter based on this invention is demonstrated using FIG.
In addition, below, description is abbreviate | omitted by attaching | subjecting the same member number about the same member as the walk type rice transplanter 1 demonstrated using FIGS. 1-21 previously.

  As shown in FIG. 22, the main clutch / stand operation mechanism 280 includes a first steel wire 281, an engagement member 182, a rotating bracket 283, a second steel wire 284, and an operation member 190.

  The first steel wire 281 is an embodiment of the steel wire according to the present invention, and is formed into a linear shape by drawing a steel material.

One end portion (front end portion) of the first steel wire 281 is bent into a hook shape to form a hook portion 281a.
The hook portion 281a is fixed (locked) to a through hole 152d formed in the operation arm portion 152c of the operation arm unit 152 of the stand 15 (see FIG. 15).

The middle part of the first steel wire 281 is formed in a spiral shape to form a spring part 281b.
The spring portion 281b is an embodiment of the spring member according to the present invention and can be elastically deformed.

  A portion excluding the hook portion 281a and the spring portion 281b from the first steel wire 281 (more specifically, a portion of the first steel wire 281 sandwiched between the hook portion 281a and the spring portion 281b and the rear end of the spring portion 281b To the rear end of the first steel wire 281) is an embodiment of the wire member according to the present invention.

  An engaging member 182 is fixed to a middle portion of the first steel wire 281 and closer to the rear end portion of the first steel wire 281 than the spring portion 281b.

  The rotating bracket 283 includes a cylindrical portion 283a, a first arm portion 283b, and a second arm portion 283c.

  The cylindrical portion 283a is a metal cylindrical member. The cylindrical portion 283a is rotatably inserted in the lower frame 171a (see FIG. 18) of the handle frame 171.

The first arm part 283b and the second arm part 283c are metal elongated plate-like members.
One end portions of the first arm portion 283b and the second arm portion 283c are fixed to the outer peripheral surface of the cylindrical portion 283a by welding.
The longitudinal direction of the first arm part 283b and the second arm part 283c fixed to the outer peripheral surface of the cylindrical part 283a is perpendicular to the axial direction of the cylindrical part 283a.
Through holes are formed in the other end portions of the first arm portion 283b and the second arm portion 283c, respectively.
The rear end portion of the first steel wire 281 is fixed to the other end portion of the first arm portion 283b (the rear end portion of the first steel wire 281 is a through hole formed in the other end portion of the first arm portion 283b. To be locked in).

The second steel wire 284 is formed by drawing a steel material into a linear shape.
One end portion of the second steel wire 284 is fixed to the other end portion of the second arm portion 283c (one end portion of the second steel wire 284 is locked to a through hole formed in the other end portion of the second arm portion 283c. )

As described above, the main clutch / stand operation mechanism 280
By forming the middle portion of the first steel wire 281 in a spiral shape, the spring portion 281b that is a portion of the first steel wire 281 formed in a spiral shape is an embodiment of the spring member according to the present invention, Let the part which was not shape | molded helically among the 1st steel wires 281 be one Embodiment of the wire member which concerns on this invention.
This configuration has the following advantages.
That is, the wire member 181 of the walking type rice transplanter 1 shown in FIG. 1 to FIG. 21 includes the outer wire 181a and the inner wire 181b. The walking type rice transplanter 1 has a lot of fine dust such as yellow sand. When used in an area, dust adhered to the outer peripheral surface of the inner wire 181b during the process of using the main clutch / stand operating mechanism 180 is caused by the inside of the outer wire 181a (the inner peripheral surface of the outer wire 181a and the outer peripheral surface of the inner wire 181b). In some cases, the movement (sliding) of the inner wire 181b relative to the outer wire 181a may be obstructed (movement becomes heavy).
In order to avoid such a problem, it is necessary to frequently remove the dust adhering to the surface of the inner wire 181b, and the maintenance becomes complicated.
However, in the case of the main clutch / stand operation mechanism 280, since the outer wire is not provided in the first place, the movement of the first steel wire 281 is hindered by dust adhering to the outer peripheral surface of the first steel wire 281. No maintenance becomes easier.
Moreover, the wire member and the spring member are separated from each other by using a steel wire as the wire member, forming the middle portion of the steel wire in a spiral shape, and using the portion formed in the spiral shape as a spring member. It is possible to reduce the number of parts compared to the case of doing so.

DESCRIPTION OF SYMBOLS 1 Walk type rice transplanter 2 Body 3 Engine 4L Left wheel 4R Right wheel 5 Planting device 6 Seedling supply device 7 Transmission mechanism 10C Center float (float)
10L Left side float 10R Right side float 11 Pitching control mechanism 15 Stand 16 Main clutch 151a / 151e Stand shaft portion 151c Abutting portion 152c Operation arm portion 161 Main clutch arm (main arm portion)
162 Main clutch roller (roller part)
163 Engaging arm (on / off member, engaging part)
164 Main clutch spring (biasing part)
180 Main clutch / stand operation mechanism (operation mechanism)
181 Wire member 182 Engagement member 187 Spring member 190 Operation member

Claims (3)

A stand capable of changing the posture between a restriction posture that restricts the front end of the float from moving upward and a retreat posture that does not restrict;
An on / off member provided in a main clutch for transmitting and stopping driving force from the engine to the transmission;
A walking type rice transplanter having an operation mechanism for operating
The operating mechanism is
A wire member having one end fixed to the stand;
An engagement member that is fixed to a midway portion of the wire member and engages with an on / off member of the main clutch;
A spring member provided at a position in the middle of the wire member and closer to one end of the wire member than the engaging member;
An operation member connected to the other end of the wire member;
Comprising
When the other end portion of the wire member is pulled by operating the operation member, the stand rotates to change the stand posture from the retracted posture to the restricting posture, and the on / off member. The transmission of the driving force to the transmission is stopped when the main clutch rotates while engaging with the engaging member.
Walking type rice transplanter. The stand is
A stand shaft that is pivotally supported by the airframe;
An abutment portion fixed to the stand shaft portion and abutting against an upper surface of the float in the restricted posture;
One end part is fixed to the stand shaft part, and the other end part is an operation arm part to which one end part of the wire member is fixed,
Comprising
The main clutch is
A main arm portion rotatably supported by the airframe;
A roller portion rotatably supported at one end of the main arm portion;
An engagement portion fixed to the main arm portion and engaged with the engagement member;
An urging portion that urges the main arm portion so that the roller portion rotates in a direction in contact with a belt that transmits driving force from the engine to the transmission;
Comprising
The engaging portion of the main clutch corresponds to the on / off member,
The walking type rice transplanter according to claim 1. By forming the middle part of the steel wire in a spiral shape, a portion of the steel wire that is formed in a spiral shape is used as the spring member, and a portion of the steel wire that is not formed in a spiral shape is used as the wire member. To
The walking type rice transplanter according to claim 1 or 2.

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