JP2011087537A - Walking type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a walking type rice transplanter decreased in production cost by simplified in the structure. <P>SOLUTION: There is provided a walking type rice transplanter 1 having a marker 122 rotatably supported on a handle frame 111 and capable of switching the working state or the non-working state. The transplanter includes: a connecting part (first connecting part) 121P set to be integrally rotated with the marker 122; a connecting part (second connecting part) 28b integrally set with the handle frame 111; and a spring (energizing member) 128 stretched between the connecting part 121P and the connecting part 28b, and when a turning fulcrum 122b is positioned at one side of a line connecting the connecting part 121P and the connecting part 28b, based on the view from the axis direction, energizing the marker 122 to keep the working state, and when the turning fulcrum 122b is positioned at the other side of a line connecting the connecting part 121P and the connecting part 28b, based on the view from the axis direction, energizing the marker 122 to keep the non-working state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a technique of a walking type rice transplanter.
More specifically, the present invention relates to a marker technique for drawing a reference line on a farm scene as a mark in the traveling direction during work.

  2. Description of the Related Art Hitherto, a walking type rice transplanter having a marker that draws a reference line on a farm scene as a mark of a traveling direction during work is known. For example, as described in Patent Document 1.

  The walking type rice transplanter described in Patent Document 1 supports a marker and one end of the marker and is rotatably supported by a handle frame, and is separated from an action position where the other end of the marker contacts a farm scene and the farm scene. A marker mounting arm that can be switched to a non-operating position, a marker lever that is rotatably supported at one end on the side of the marker mounting arm, and a connecting rod that connects the marker mounting arm and the marker lever And a spring for urging the marker mounting arm toward the non-operating position, and a lock member for holding the marker mounting arm in the operating position.

  In such a walking type rice transplanter, when the marker lever is rotated, the marker mounting arm and the marker are rotated via the connecting rod. When the marker lever is rotated and the marker is rotated to the operating position, the marker mounting arm is held at the operating position by the lock member. In this state, a reference line can be drawn on the farm scene by moving the other end of the marker in contact with the farm scene. Further, when the holding of the marker mounting arm by the lock member is released, the marker is rotated to the non-operating position by the biasing force of the spring.

  However, in the case of the walking type rice transplanter described in Patent Document 1, the marker mounting arm and the marker are always urged to the non-acting position side. A lock member for holding is required. Moreover, in order to engage with the lock member, it is necessary to process the shape of the marker mounting arm, which is disadvantageous in that the manufacturing cost increases.

Japanese Patent Laid-Open No. 2002-10

  An object of the present invention is to provide a walking type rice transplanter capable of simplifying the structure and reducing the manufacturing cost.

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

  That is, according to the first aspect, the handle frame connected to the machine body is rotatably supported via a rotation fulcrum portion provided at one end, and the other end is brought into contact with the field and the reference line is set on the field scene. A walking type rice transplanter comprising a marker that can be switched to a pulling working state, or a non-working state in which the other end is separated from the field, the first connecting portion provided to rotate integrally with the marker; A second connecting portion provided integrally with the handle frame; and stretched between the first connecting portion and the second connecting portion so that the pivot fulcrum portion is seen from the axial direction. When located on one side of a straight line connecting the locking portion and the second locking portion, the marker is urged and held in the working state, and the rotation fulcrum portion is viewed in the axial direction. Located on the other side of the straight line connecting one locking part and the second locking part If, those comprising a biasing member for holding by biasing the marker to the non-working state.

  The bracket according to claim 2, wherein the bracket is supported by the handle frame so as to be rotatable about the rotation fulcrum, and the operation tool is supported by the handle frame so as to be rotatable in the same direction as the marker. A connecting member that connects the operation tool, and the marker is sandwiched between the bracket and the connecting member and is held by the bracket so as not to be relatively rotatable.

  In Claim 3, the connecting member has flexibility capable of changing a linear distance between one end on the bracket side and the other end on the operation tool side, and when the marker is in the non-working state, The pivot fulcrum is located on one side of a straight line connecting one end and the other end of the connecting member when viewed from the axial direction, the connecting member is bent, and the pivot fulcrum is viewed from the axial direction. When located on the other side of the straight line connecting one end and the other end of the connecting member, the connecting member holds the marker in a retracted state in which the marker is further rotated to the inside of the machine body than the non-working state.

  According to a fourth aspect of the present invention, the bracket regulates the rotation of the marker by the urging force of the urging member by abutting with the handle frame in the working state, and abuts on the handle frame in the retracted state. The rotation of the marker due to the restoring force of the connecting member is restricted.

  The present invention has an effect that the structure can be simplified and the manufacturing cost can be reduced as compared with the conventional case.

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 left marker mechanism and right marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The rear enlarged view which shows the "working state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The plane enlarged view which shows the "working state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The rear view which shows the "working state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The rear view which shows the "non-working state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The rear enlarged view which shows the "non-working state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The rear view which shows the "storage state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The rear enlarged view which shows the "storage state" of the left marker mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. Side surface sectional drawing which shows the fuel tank of one Embodiment of the walk type rice transplanter which concerns on this invention. The figure which shows the cap of one Embodiment of the walk type rice transplanter which concerns on this invention. (A) Top view. (B) EE sectional drawing in FIG.17 (c). (C) Bottom view. The figure which shows the packing of one Embodiment of the walk type rice transplanter which concerns on this invention. (A) Top view. (B) FF sectional drawing in Fig.18 (a).

  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. 18 is demonstrated. In this embodiment, a four-row walking type rice transplanter 1 will be described.

  As shown in FIG. 1 to FIG. 6, the walking type rice transplanter 1 is mainly composed of a body 2, an engine 3, a left wheel 4L, a right wheel 4R, a planting device 5, a seedling supply device 6, a transmission mechanism 7, a center float 10C, a left A side float 10L, a right side float 10R, an operation unit 11, and a fuel tank 14 are provided.

Airframe 2 refers to a member group constituting 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 center planting case 27C, A left planting case 27L, a right planting case 27R, a left rear frame 28L, and a right rear frame 28R are provided.
Note that the aircraft is not limited to the configuration of the aircraft 2 of the present 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 rotatable and transmit driving force to them.
The center planting case 27C of the present embodiment is a cast product, and the front end portion of the center planting case 27C is fixed to the rear end portion of the center frame 24.

The left planting case 27L rotatably supports the left planting arm 52L in the planting device 5 described later 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 supports the right planting arm portion 52R of the planting device 5 to be described later in a rotatable manner 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-shaped 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 this 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.

  The engine 3 shown in FIGS. 3, 4, and 6 is a drive 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 includes a center left planting arm 51L, a center right planting arm 51R, a left planting arm 52L, a right planting arm 52R, a driving arm and an interlocking arm (not shown), and the like. It constitutes a planting device.
The left planting arm 52L, the center left planting arm 51L, the center right planting arm 51R, and the right planting arm 52R are arranged in order from the left with a space therebetween, and the machine body 2 of the walking type rice transplanter 1 It is arranged at the bottom of the back.
The center left planting arm 51L, the center right planting arm 51R, the left planting arm 52L, and the right planting arm 52R have a predetermined amount of seedlings in a seedling supply device 6 (front end of the seedling platform 61) described later. The seedling is planted in the field by performing a series of operations of cutting and transplanting the seedling into the field (paddy field).

The seedling supply device 6 shown in FIGS. 1 to 4 and 6 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, and a spare 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 table 61 is a plate-like member having a mounting surface inclined downward in the forward direction, and an upper seedling table fixed in the left-right direction on the seedling table frame (the handle frame 111 in the present embodiment) at the rear of the machine body 2. 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 arranged at the front lower part of the seedling placing table 61 and conveys the seedling mat placed on the placing surface to the front end portion of the seedling placing 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 drives the seedling table 61 to reciprocate left and right, and is disposed in front of and below the seedling 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. is there.
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 inter-gear gear 87, inter-gear transmission gear 88, planting clutch shaft 89 Bevel gear 89a, planting clutch 90, center planting transmission shaft 91, bevel gears 91a and 91b, center planting arm shaft 92, bevel gear 92a, sprocket 92b, left planting transmission shaft 93L, right planting transmission shaft 93R, bevel gear 94L 94R, left rear transmission shaft 95L, right rear transmission shaft 95R, bevel gears 96L and 96R, bevel gears 97L and 97R, left implantation arm shaft 98L, right implantation arm shaft 98R and bevel gears 99L and 99R.

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 It is not transmitted from the main shaft 73 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 part formed on the planting clutch gear 90a and the engaging part formed on the planting clutch pawl 90b are engaged) The driving force transmitted to the 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 the bevel gear 89a, the bevel gear 91a, the central planting transmission shaft 91, the bevel gear 91b, the bevel gear 92a, the central planting arm shaft 92, and the central left planting arm 51L and the central right planting. It is transmitted to the attached arm portion 51R.
The driving force transmitted to the central planting arm shaft 92 is transmitted to the seedling supply device 6 (vertical feeding device 62 and lateral feeding device 63) via the sprocket 92b.

  The driving force transmitted to the planting clutch shaft 89 is the left planting arm 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. 52L.

  The driving force transmitted to the planting clutch shaft 89 passes through 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. 52R.

As shown in FIGS. 1 to 4, the center float 10C, the left side float 10L, and the right side float 10R impart buoyancy to the walking type rice transplanter 1 (as a result, the walking type rice transplanter 1 is buried in a field (paddy field). To prevent this).
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 to 3, 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 to 3, the right side float 10 </ b> R is disposed at a position below the airframe 2 and on the right rear side.

Below, the operation part 11 is demonstrated using FIG.2, FIG.3, FIG.6 and FIG.
The operation unit 11 is for an operator to operate each part of the walking type rice transplanter 1, and is disposed on the rear side of the walking type rice transplanter 1.
2 and 3, the operation unit 11 includes a handle frame 111, a main clutch lever 112, a travel / stock shift lever 113, a left side clutch lever 114L, a right side clutch lever 114R, a planting clutch lever 115, and a swing lever 116. , A seedling removal amount adjusting lever 117, a left marker mechanism 120, and a right marker mechanism 130.

The handle frame 111 is a main structure of the operation unit 11 and is fixed to the rear part of the machine body 2.
As shown in FIGS. 2, 3, and 8, the handle frame 111 includes a lower frame 111a, a center frame 111b, an upper frame 111c, a left frame 111d, and a right frame 111e.

The lower frame 111 a is a member that forms the lower part of the handle frame 111.
The lower frame 111a of the present embodiment is a metal elongated cylinder. One end (left end) of the lower frame 111a is fixed to the rear end of the left rear frame 28L. The other end (right end) of the lower frame 111a is fixed to the rear end of the right rear frame 28R.
As shown in FIG. 8, a left through hole 111f that penetrates the lower frame 111a in the front-rear direction is formed at the left end of the lower frame 111a.
A right through hole 111k that penetrates the lower frame 111a in the front-rear direction is formed at the right end of the lower frame 111a.

The center frame 111 b is a member that forms the center portion of the handle frame 111.
The center frame 111b of the present embodiment is a metal elongated rectangular tube.
One end portion (front end portion) of the center frame 111b is fixed to the rear end portion of the center planting case 27C, and the middle portion of the center frame 111b is fixed to the center portion (left and right center portion) of the lower frame 111a. The middle frame 111b is bent at a middle portion (a portion fixed to the middle portion of the lower frame 111a), and the middle frame 111b extends diagonally upward from the middle portion to the other end portion (rear end portion). . The other end portion (rear end portion) of the center frame 111b is disposed at a position behind the upper half portion of the rear surface of the seedling mount 61.

The upper frame 111 c is a member that forms the upper part of the handle frame 111.
The upper frame 111c 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 111c is perpendicular to the longitudinal direction of the middle part of the upper frame 111c. It is bent at two places. A midway portion of the upper frame 111c is fixed to the other end of the central frame 111b.
When the midway portion of the upper frame 111c is fixed to the other end portion of the central frame 111b, the longitudinal direction of the midway portion of the upper frame 111c is parallel to the left-right direction, and one end portion (left end portion) and the other end portion of the upper frame 111c The (right end) extends to the rear of the middle part of the upper frame 111c. A grip for an operator to hold is attached to one end and the other end of the upper frame 111c.

The left side frame 111 d is a member that forms the left side of the handle frame 111.
The left side frame 111d of the present embodiment is a metal elongated cylinder. One end (lower end) of the left frame 111d is fixed to one end (left end) of the lower frame 111a. The other end portion (upper end portion) of the left frame 111d is fixed to a boundary portion (left bent portion) between one end portion and the midway portion of the upper frame 111c.
A left turning fulcrum shaft 111g is fixed to the middle part of the left and right frames 111d so that the longitudinal direction is substantially parallel to the front-rear direction (so as to be parallel to the axial direction of the left through hole 111f).
A left marker restricting portion 111h is fixed in the middle of the left and right frames 111d and above the left pivot point 111g so that the longitudinal direction is substantially parallel to the front-rear direction.

The right side frame 111 e is a member that forms the right side of the handle frame 111.
The right side frame 111e of the present embodiment is a long and narrow metal cylinder. One end (lower end) of the right side frame 111e is fixed to the other end (right end) of the lower frame 111a. The other end portion (upper end portion) of the right side frame 111e is fixed to a boundary portion (right bent portion) between the other end portion and the midway portion of the upper frame 111c.
A right rotation fulcrum shaft 111m is fixed to the middle part of the right side frame 111e so that the longitudinal direction is substantially parallel to the front-rear direction (so as to be parallel to the axial direction of the right through hole 111k).
A right marker restricting portion (not shown) is fixed so that the longitudinal direction is substantially parallel to the front-rear direction in the middle part of the right side frame 111e and above the right pivot point 111m.

The main clutch lever 112 is a lever for switching whether or not the driving force is transmitted from the engine 3 to the transmission mechanism 7.
The base end portion of the main clutch lever 112 is rotatably supported at a position slightly leftward in the middle of the upper frame 111c.
A base end portion of the main clutch lever 112 is connected to a main clutch mechanism (not shown) via a link mechanism (not shown).
When the main clutch lever 112 is operated to “ON”, a main clutch mechanism (not shown) applies a predetermined amount of tension to the belt 72c, and the driving force is transmitted from the engine 3 to the transmission mechanism 7 via the belt 72c. Communicated.
When the main clutch lever 112 is operated to “disconnect”, the main clutch mechanism (not shown) does not apply tension to the belt 72c, and the driving force is not transmitted from the engine 3 to the transmission mechanism 7 via the belt 72c.

The travel / strain shift lever 113 is a lever for performing a travel shift and a stock shift of the walking rice transplanter 1.
The base end portion of the traveling / stock shifting lever 113 is rotatably supported by the body 2 (more specifically, the upper part of the central planting case 27C), and the distal end portion of the traveling / stock shifting lever 113 (by an operator by hand). Is provided at a position in front of the upper half of the rear surface of the seedling mount 61.
The travel / stock shift lever 113 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 inter-shaft shifting of the walking type rice transplanter 1 by turning the traveling / stock shifting lever 113 while holding the tip of the traveling / stock shifting lever 113 by hand.

  The left side clutch lever 114L and the right side clutch lever 114R are levers for operating the traveling direction (straight, left turn, and right turn) of the walking type rice transplanter 1.

The left side clutch lever 114L is rotatably supported on the lower portion of the left end portion of the upper frame 111c.
The left side clutch lever 114L is connected to a left side clutch shifter 79L (more specifically, the left side clutch hawk 114a (see FIG. 7)) via a link mechanism (not shown).
The operator holds the left side clutch lever 114L in a gripped state (holds the left side clutch lever 114L rotating upward), thereby moving the left side clutch shifter 79L to the right side, 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 114R is rotatably supported at the lower portion of the right end portion of the upper frame 111c.
The right side clutch lever 114R is connected to a right side clutch shifter 79R (more specifically, the right side clutch hawk 114b (see FIG. 7)) via a link mechanism (not shown).
The operator holds the right side clutch lever 114R in a gripped state (holds the state in which the right side clutch lever 114R rotates 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 114L nor the right side clutch lever 114R, the walking type rice transplanter 1 can go straight.
When the operator holds the left side clutch lever 114L and does not hold the right side clutch lever 114R, the walking rice transplanter 1 can turn left.
When the operator holds the right side clutch lever 114R and does not hold the left side clutch lever 114L, the walking type rice transplanter 1 can turn right.
When the worker holds both the left side clutch lever 114L and the right side clutch lever 114R, the walking type rice transplanter 1 cannot go straight.

The planting clutch lever 115 is a lever that switches whether or not the driving force is transmitted from the engine 3 to the planting device 5 and the seedling supply device 6.
The proximal end portion of the planting clutch lever 115 is rotatably supported at a position slightly to the right in the middle of the upper frame 111c “in a direction in which the distal end portion of the planting clutch lever 115 tilts in the front-rear direction”.
The proximal end portion of the planting clutch lever 115 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 115 is connected to the planting clutch hawk 115a (see FIG. 7) via a link mechanism (not shown).
The planting clutch hawk 115a 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” (planting from the engine 3). This is a member for switching to “the state in which the driving force cannot be transmitted to the device 5 and the seedling supply device 6)”.
When the planting clutch hawk 115a is not engaged with the planting clutch pawl 90b, the state of the planting clutch 90 is maintained at “ON”.
When the planting clutch hawk 115a is engaged with the planting clutch claw 90b, the state of the planting clutch 90 is maintained at “OFF”.
The operator turns the planting clutch lever 115 so that the tip of the planting clutch lever 115 tilts forward (sets the planting clutch lever 115 to “ON”), whereby the state of the planting clutch 90 is reached. Can be held “on”.
The operator turns the planting clutch lever 115 so that the tip of the planting clutch lever 115 tilts backward (turns the planting clutch lever 115 to “OFF”), thereby the state of the planting clutch 90. Can be held “off”.

The swing lever 116 is a lever for operating the vehicle height of the walking type rice transplanter 1.
The base end portion of the swing lever 116 is rotatably supported at a position slightly on the right side of the upper frame 111c and next to the right of the planting clutch lever 115.
The base end of the swing lever 116 is connected to a pitching control mechanism (not shown) via a link mechanism (not shown). The pitching control mechanism (not shown) controls 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 farm field (paddy field). This is a mechanism for stabilizing the planting depth.
The operator switches the state between “automatic swing”, “manual swing”, and “interlocked swing” by rotating the swing lever 116 so that the tip of the swing lever 116 tilts in the left-right direction. Is possible.

“Automatic swing” is a state in which a pitching control mechanism (not shown) controls the vehicle height of the walking type rice transplanter 1.
When the front end of the swing lever 116 is disposed at a position corresponding to “automatic swing” in the left-right direction, the pitching control mechanism (not shown) is “relative height of the front end of the center float 10C with respect to the body 2”. The vehicle height of the walking type rice transplanter 1 is controlled based on the above.

The “manual swing” is a state in which the adjustment of the vehicle height by the operator operating the swing lever 116 is prioritized over the vehicle height control by the pitching control mechanism (not shown).
When the tip of the swing lever 116 is disposed at a position corresponding to the “manual swing” in the left-right direction, the operator rotates the swing lever 116 so that the tip of the swing lever 116 tilts in the front-rear direction. Thus, the left wheel 4L and the right wheel 4R can be moved upward or downward (change the vehicle height) with respect to the airframe 2 in preference to the pitching control mechanism (not shown).

The “interlocking swing” is a pitching control mechanism (when the driving force can be transmitted from the engine 3 to the planting device 5 and the seedling supply device 6) when the operator sets the planting clutch lever 115 to “ON”. (Shown) controls the vehicle height of the walking-type rice transplanter 1, and when the operator turns the planting clutch lever 115 "OFF", the vehicle height is raised in conjunction with the operation.
The operator pushes the planting clutch lever 115 so that the tip of the planting clutch lever 115 tilts backward when the tip of the swing lever 116 is disposed at a position corresponding to the “interlocking swing” in the left-right direction. By rotating, “stop of 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 harvesting adjustment lever 117 has the seedling harvesting amount, that is, the center left planting arm 51L, the center right planting arm 51R, the left planting arm 52L and the right planting arm 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 from the seedling mats.
The base end portion of the seedling removal amount adjusting lever 117 is rotatably supported on the right side surface of the middle portion of the center frame 111b. The base end portion of the seedling removal amount adjusting lever 117 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 collection amount by rotating the swing lever 116 so that the tip of the seedling collection amount adjusting lever 117 tilts in the vertical direction.

Hereinafter, the left marker mechanism 120 will be described with reference to FIGS. In the following description, the direction of arrow L in the figure is defined as the left direction, and the direction of arrow R is defined as the right direction.
The left marker mechanism 120 is for drawing a reference line that serves as a mark in the traveling direction during work on the farm scene.
As shown in FIGS. 8 to 11, the left marker mechanism 120 includes a bracket 121, a marker 122, a connecting member 123, a marker operation lever 124, a washer 125, a washer 126, a pin 127, and a spring 128.

As shown in FIGS. 8 to 10, the bracket 121 is a member formed by appropriately cutting or bending a metal plate. The bracket 121 includes an upper plate 121U, a rear plate 121R, a front plate 121F, and a connecting portion 121P.
The bracket 121 is bent into a concave shape that opens downward at two locations in the front and rear middle portions so that the rear portion and front portion of the metal plate are perpendicular to the middle portion, and the upper plate 121U, the rear plate 121R, and the front plate 121F is formed. The rear plate 121R and the front plate 121F are arranged with their plate surfaces approximately front and rear. The longitudinal distance between the rear plate 121R and the front plate 121F is formed to be slightly larger than the diameter of the lower frame 111a. Further, the connecting portion 121P is formed by bending a part of the front plate 121F forward so as to be perpendicular to the front plate 121F.

The right end side (locking portion 121a) of the upper plate 121U is formed to be parallel to the front-rear direction.
The rear plate 121R extends rightward from the right end (locking portion 121a) of the upper plate 121U. A through hole 121b that penetrates the rear plate 121R is formed at the right end of the rear plate 121R.
The right side of the front plate 121F extends rightward from the right end (the locking portion 121a) of the upper plate 121U. A through hole 121c that penetrates through the front plate 121F is formed at the right end of the front plate 121F (a position facing the through hole 121b of the rear plate 121R).
The left side of the front plate 121F extends to the left rather than the left end of the upper plate 121U. A through hole 121d penetrating the front plate 121F is formed at the left end of the front plate 121F.
A through hole 121e penetrating the plate surface of the connecting part 121P is formed at the front end of the connecting part 121P.

  The marker 122 is for drawing a reference line on the farm scene by contacting the farm scene while the walking rice transplanter 1 is in progress. The marker 122 includes a main body portion 122a, a rotation fulcrum portion 122b, and an action portion 122c.

The main body portion 122a is an elongated round bar-like portion, and is bent at one end (tip portion) side thereof. More specifically, when the marker 122 is in a “working state” described later, the main body 122a is bent so that one end of the main body 122a faces rearward and downward.
The rotation fulcrum portion 122b is formed by bending the other end portion (base end portion) of the main body portion 122a substantially rearward so as to be perpendicular to the main body portion 122a.
The action part 122c is a part in contact with a farm scene, and one end thereof is fixed to one end of the main body part 122a. When the marker 122 is in a “working state” to be described later, the action part 122c is formed so that the tip thereof faces the rear lower side and can contact the field scene where the walking type rice transplanter 1 is working.

  The connecting member 123 connects the marker 122 and the marker operation lever 124. The connecting member 123 includes a main body portion 123a, a lower connecting portion 123b, and an upper connecting portion 123c.

The main body 123a is an elongated round bar-shaped part. The main body portion 123a has flexibility and can be bent when a force is applied in a direction perpendicular to the axial direction.
The lower connecting portion 123b is formed by bending one end portion (lower end portion) of the main body portion 123a rearward so as to be substantially U-shaped.
The upper connecting portion 123c is formed by bending the other end portion (upper end portion) of the main body portion 123a toward the front so as to be substantially U-shaped.

  As shown in FIGS. 8 and 11, the marker operation lever 124 is for rotating the marker 122. The marker operation lever 124 includes a main body portion 124a, a rotation fulcrum portion 124b, a grip 124c, and a locking portion 124d.

The main body 124a is a round bar-shaped part.
The rotation fulcrum portion 124b is a cylinder that is arranged with the axial direction being substantially the front-rear direction. A front and rear midway portion of the outer peripheral surface of the rotation fulcrum portion 124b is fixed to a lower end portion of the main body portion 124a.
The grip 124c is for an operator to hold and is attached to the upper end of the main body 124a.
The locking portion 124d is a plate-like member, and is disposed with its plate surface facing substantially forward and backward, and is provided in the vicinity of the upper end portion of the main body portion 124a. A through hole is formed in the locking portion 124d so as to penetrate the locking portion 124d in the front-rear direction.

  The spring 128 is a tension coil spring having hooks at both ends.

  Hereinafter, a method for assembling the left marker mechanism 120 will be described with reference to FIGS.

  First, the bracket 121 is positioned such that the lower frame 111a is sandwiched between the rear plate 121R and the front plate 121F (more specifically, the through hole 121b of the rear plate 121R, the through hole 121c of the front plate 121F, and the left side of the lower frame 111a. The through holes 111f are arranged in a straight line). In this state, the rotation fulcrum portion 122b of the marker 122 is inserted through the through hole 121c, the left through hole 111f, and the through hole 121b in order from the front. Thus, the bracket 121 is rotatably supported by the lower frame 111a by the rotation fulcrum portion 122b.

  At this time, the marker 122 is positioned on the lower side of the connecting portion 121P of the bracket 121 (the counterclockwise side of the connecting portion 121P with the rotation fulcrum portion 122b as the center in the rear view (FIG. 9)). Arrange as follows. Accordingly, when the marker 122 attempts to rotate clockwise with respect to the bracket 121 (FIG. 9), the main body 122a and the connecting portion 121P come into contact with each other, and the rotation of the marker 122 is restricted.

  Next, the upper connecting portion 123c of the connecting member 123 is inserted from the rear into the through hole of the locking portion 124d of the marker operating lever 124 to connect the connecting member 123 and the marker operating lever 124.

  Next, the lower connecting portion 123b of the connecting member 123 is inserted through the through hole 121c of the bracket 121 from the front, and the washer 125, the turning fulcrum portion 124b of the marker operating lever 124, and the washer 126 are sequentially turned to the left turning fulcrum shaft 111g. Insert through. The marker operating lever 124 is locked to the handle frame 111 (left side frame 111d) by locking the pin 127 to the left rotation fulcrum shaft 111g behind the washer 126 so that the washer 126 does not fall off the left rotation fulcrum shaft 111g. ) Is rotatably supported. At this time, since the left rotation fulcrum shaft 111g and the left through-hole 111f are parallel, the marker 122 and the marker operation lever 124 can rotate in the same direction (around the axes parallel to each other).

At this time, the connecting member 123 has the lower connecting portion 123b on the lower side of the main body portion 122a of the marker 122 (on the counterclockwise side with respect to the main body portion 122a with respect to the rotation fulcrum portion 122b in the rear view (FIG. 9)). Arrange to pass. Accordingly, when the marker 122 tries to rotate counterclockwise with respect to the bracket 121 (FIG. 9), the main body 122a and the lower connecting portion 123b come into contact with each other, and the rotation of the marker 122 is restricted. .
Further, at this time, as shown in FIG. 10, the connecting member 123 is arranged so that the main body portion 123 a passes immediately in front of the main body portion 122 a of the marker 122. Accordingly, when the marker 122 tries to move forward, the main body portion 122a of the marker 122 and the main body portion 123a of the connecting member 123 come into contact with each other, and the forward movement of the marker 122 is restricted. That is, it is possible to prevent the pivot fulcrum portion 122b of the marker 122 from falling forward from the left through hole 111f of the lower frame 111a and the through holes 121b and 121c of the bracket 121.

  Finally, one end of the spring 128 is locked to the connecting portion 28b of the left rear frame 28L, and the other end is locked to the through hole 121e of the connecting portion 121P of the bracket 121. In this way, the connecting portion 121P of the bracket 121 is constantly biased toward the connecting portion 28b.

  As described above, the marker 122 can be held by the connecting portion 121P and the lower connecting portion 123b of the connecting member 123, and the rotation of the marker 122 relative to the bracket 121 can be restricted. That is, the marker 122 cannot be rotated relative to the bracket 121, and the marker 122 and the bracket 121 can rotate integrally with respect to the lower frame 111a.

Further, as described above, the left marker mechanism 120 is assembled to the handle frame 111 by combining the components.
More specifically, the bracket 121 is supported on the lower frame 111a by the pivot fulcrum portion 122b of the marker 122, and the marker 122 cannot be rotated relative to the bracket 121 by the connecting portion 121P of the bracket 121 and the lower connecting portion 123b of the connecting member 123. The marker 122 is held by the main body 123a of the connecting member 123 so as not to fall off the lower frame 111a and the bracket 121.
Therefore, the fastening member necessary for assembling the left marker mechanism 120 to the handle frame 111 is only the pin 127 that locks the marker operation lever 124 so as not to drop off the left rotation fulcrum shaft 111g. Etc. are not required.

  Hereinafter, the operating state (“non-working state”, “working state”, and “storing state”) of the left marker mechanism 120 will be described with reference to FIGS. 9 to 15. The left marker mechanism 120 can be switched to any one of “non-working state”, “working state”, and “storing state”.

  As shown in FIG. 12 and FIG. 13, the “non-working state” is a state in which the left marker mechanism 120 does not draw a reference line as a mark of the traveling direction on the field scene when working with the walking rice transplanter 1.

When the left marker mechanism 120 is in the “non-working state”, one end (connecting portion 28b) and the other end (through hole) of the spring 128 are viewed from the rear (FIG. 13) (viewed from the axial direction of the rotation fulcrum portion 122b). 121e) is located on the left side of the straight line connecting the pivots 122b of the marker 122. Therefore, the bracket 121 is urged clockwise around the rotation fulcrum 122b by the urging force of the spring 128.
When the bracket 121 is urged clockwise by the urging force of the spring 128, the marker operation lever 124 is urged clockwise around the rotation fulcrum portion 124b via the connecting member 123. The marker operating lever 124 is held in a state of being in contact with the left marker restricting portion 111h while being urged toward the left marker restricting portion 111h.
By holding the marker operation lever 124, the rotation position of the bracket 121 is held at a position corresponding to the rotation position of the marker operation lever 124 via the connecting member 123.

  When the left marker mechanism 120 is in the “non-working state”, the rotation position of the marker 122 is held together with the bracket 121. In this case, the main body 122a of the marker 122 is directed to the upper left in the rear view (FIG. 12) from the proximal end to the distal end. When the walking type rice transplanter 1 enters the farm field in this state, the action part 122c is at a position away from the farm scene.

  When the left marker mechanism 120 is in the “non-working state”, the action unit 122c of the marker 122 is separated from the farm scene even if the planting operation is performed by the walking rice transplanter 1, so that the left marker mechanism 120 enters the farm scene. Do not draw a reference line.

  As shown in FIGS. 9 to 11, the “working state” is a state in which the left marker mechanism 120 draws a reference line that serves as a mark in the traveling direction when working with the walking rice transplanter 1 on the field scene.

When the left marker mechanism 120 is in the “working state”, one end (connecting portion 28b) and the other end (through hole 121e) of the spring 128 are seen in the rear view (FIG. 9) (viewed from the axial direction of the rotation fulcrum portion 122b). ) Is located on the right side of the straight line connecting the two points). That is, the “working state” with respect to the “non-working state” is a state in which the spring 128 has exceeded the so-called fulcrum. Therefore, the bracket 121 is urged counterclockwise by the urging force of the spring 128 about the rotation fulcrum portion 122b.
In a state where the upper plate 121U of the bracket 121 is parallel to the axial direction of the lower frame 111a, the lower surface of the upper plate 121U and the lower frame 111a abut. The bracket 121 is held in a state of being in contact with the lower frame 111a by the biasing force of the spring 128.
By holding the bracket 121, the rotation position of the marker operation lever 124 is held at a position corresponding to the rotation position of the bracket 121 via the connecting member 123.

  When the left marker mechanism 120 is in the “working state”, the rotation position of the marker 122 is held together with the bracket 121. In this case, the main body 122a of the marker 122 is directed leftward from the proximal end to the distal end in the rear view (FIG. 11). When the walking type rice transplanter 1 enters the farm field in this state, the action part 122c is in a position in contact with the farm scene.

  When the left marker mechanism 120 is in the “working state”, when the planting operation is performed by the walking type rice transplanter 1, the walking type rice transplanter 1 proceeds in a state where the action portion 122c of the marker 122 is in contact with the farm scene. As a result, a reference line parallel to the path traveled by the walk-type rice transplanter 1 is drawn on the trace (the left side of the path traveled by the walk-type rice transplanter 1) of the action unit 122c in contact with the farm scene. The worker walks first by advancing the walking type rice transplanter 1 so that the left and right center of the machine body 2 follows the reference line after proceeding to the end of the field and making the U-turn of the walking type rice transplanter 1. The walking type rice transplanter 1 can be advanced in parallel with the path traveled by the type rice transplanter 1. Thereby, even when planting work while reciprocating in the field, seedlings can be planted in parallel and at a predetermined interval (interval).

  As shown in FIGS. 14 and 15, the “stored state” is a state in which the left marker mechanism 120 is stored within the lateral width of the handle frame 111.

When the left marker mechanism 120 is in the “retracted state”, one end of the connecting member 123 (the through hole 121d of the bracket 121) in the rear view (FIGS. 14 and 15) (as viewed from the axial direction of the rotation fulcrum portion 122b). The rotation fulcrum portion 122b of the marker 122 is located on the left side of the straight line X connecting the first end and the other end (through hole of the locking portion 124d). In this case, the connecting member 123 is curved so that the midway part of the main body part 123a protrudes toward the right side of the straight line X. Therefore, the marker operating lever 124 is urged clockwise about the rotation fulcrum portion 124b by the restoring force of the connecting member 123 (the force that the main body portion 123a tries to extend linearly), and the bracket 121 rotates. It is urged clockwise around the moving fulcrum 122b. At this time, the bracket 121 is urged clockwise around the rotation fulcrum portion 124b by the urging force of the spring 128.
The marker operating lever 124 is held in a state of being in contact with the left marker restricting portion 111h while being urged toward the left marker restricting portion 111h. The bracket 121 is held in a state in which the locking portion 121a is in contact with the lower frame 111a by the restoring force of the connecting member 123.

  When the left marker mechanism 120 is in the “retracted state”, the rotation position of the marker 122 is held together with the bracket 121. In this case, the bracket 121 is further rotated clockwise as compared with the “non-working state”, and the main body 122a of the marker 122 is directed to the upper right in the rear view (FIG. 14) from the proximal end portion to the distal end portion. In this state, the marker 122 is positioned on the inner side (right side) of the left end of the lower frame 111a, and the entire left marker mechanism 120 is positioned within the left-right width of the lower frame 111a.

  When the left marker mechanism 120 is in the “retracted state”, the left marker mechanism 120 is housed within the left and right widths of the lower frame 111a, thereby reducing the possibility of contact with an obstacle when the walking type rice transplanter 1 is traveling. It is possible. In addition, it is possible to save space when transporting by loading on a truck bed, etc., or when storing, making it easy to carry and store, and to make effective use of space. It becomes possible.

Hereinafter, a method of switching the operating state (“non-working state”, “working state”, and “storing state”) of the left marker mechanism 120 will be described with reference to FIGS. 9 to 15.
First, a method for switching from the “non-working state” to the “working state” will be described.

  As shown in FIGS. 12 and 13, when the left marker mechanism 120 is in the “non-working state”, the operator grasps the grip 124c of the marker operating lever 124 and views the marker operating lever 124 from the rear side (FIG. 12). Rotate clockwise. When the marker operation lever 124 is rotated counterclockwise, the bracket 121 is rotated counterclockwise against the biasing force of the spring 128 via the connecting member 123. Further, the marker operation lever 124 is rotated counterclockwise so that the rotation fulcrum portion 122b of the marker 122 is positioned on the right side of the straight line connecting one end (connecting portion 28b) and the other end (through hole 121e) of the spring 128. Then, the bracket 121 is rotated counterclockwise by the urging force of the spring 128 to a position where the lower surface of the upper plate 121U and the lower frame 111a abut, and is switched to the “working state” shown in FIGS. .

  Next, a method for switching from the “working state” to the “non-working state” will be described.

  As shown in FIGS. 9 to 11, when the left marker mechanism 120 is in the “working state”, the operator grasps the grip 124c of the marker operating lever 124 and views the marker operating lever 124 from the back (FIG. 11). Rotate around. When the marker operation lever 124 is rotated clockwise, the bracket 121 is rotated clockwise against the urging force of the spring 128 via the connecting member 123. Further, when the marker operation lever 124 is rotated clockwise and the rotation fulcrum 122b of the marker 122 is positioned to the left of the straight line connecting one end and the other end of the spring 128, the bracket 121 is moved by the biasing force of the spring 128. , Rotated clockwise. The bracket 121 is rotated clockwise to a position where the marker operating lever 124 contacts the left marker restricting portion 111h, and is switched to the “non-working state” shown in FIGS.

  Next, a method for switching from the “non-working state” to the “storage state” will be described.

  As shown in FIGS. 12 and 13, when the left marker mechanism 120 is in the “non-working state”, the operator pushes the main body 123a of the connecting member 123 to the right, and the middle part of the main body 123a is a straight line X. It curves so that it protrudes to the right rather than. When the connecting member 123 is bent, the distance between one end (the through hole 121d of the bracket 121) and the other end (the through hole of the locking portion 124d) of the connecting member 123 is shortened. At this time, since the rotation position of the marker operation lever 124 is held by the left marker restricting portion 111h, the marker operation lever 124 does not rotate, and the bracket 121 is viewed in the rear view (FIGS. 12 and 13) clockwise. Rotate. Further, when the connecting member 123 is bent and the rotation fulcrum portion 122b of the marker 122 is positioned to the left of the straight line X connecting one end and the other end of the connecting member 123, the bracket 121 is engaged by the restoring force of the connecting member 123. The stopper 121a and the lower frame 111a are rotated clockwise to a position where they come into contact with each other, and are switched to the “storage state” shown in FIGS.

  Next, a method for switching from the “storage state” to the “non-working state” will be described.

  As shown in FIGS. 14 and 15, when the left marker mechanism 120 is in the “retracted state”, the operator grasps a part of the marker 122 and holds the marker 122 against the restoring force of the connecting member 123. Rotate counterclockwise (FIG. 14). When the marker 122 is rotated counterclockwise, the bracket 121 is rotated counterclockwise. When the marker 122 is further rotated counterclockwise and the rotation fulcrum 122b of the marker 122 is positioned on the right side of the straight line X connecting one end and the other end of the connecting member 123, the bracket 121 is restored to the connecting member 123. Due to the force, the main body 123a of the connecting member 123 is rotated counterclockwise until it extends linearly, and is switched to the “non-working state” shown in FIGS.

  The operator grasps the connecting member 123 and rotates the one end (lower end) side of the connecting member 123 clockwise about the through hole of the locking portion 124d, thereby changing the state from the “stored state” to “non-working”. It is also possible to switch to “state”. In this case, the bracket 121 together with the connecting member 123 rotates counterclockwise. When the rotation fulcrum 122b of the marker 122 is positioned on the right side of the straight line X connecting one end and the other end of the connecting member 123, the main body 123a of the connecting member 123 is moved by the restoring force of the connecting member 123. It rotates counterclockwise until it extends in a straight line, and is switched to the “non-working state” shown in FIGS.

Hereinafter, the right marker mechanism 130 will be described with reference to FIG.
The right marker mechanism 130 is used to draw a reference line, which serves as a mark in the traveling direction during work, on the field scene.
The right marker mechanism 130 includes a bracket 131, a marker 132, a connecting member 133, a marker operation lever 134, a washer 135, a washer 136, a pin 137, and a spring 138.
Since the right marker mechanism 130 is configured to be bilaterally symmetric with the left marker mechanism 120, detailed description thereof is omitted.

  The bracket 131 is supported on the right end (the right through hole 111k) of the lower frame 111a by the rotation fulcrum portion 132b of the marker 132. The lower connecting portion 133 b of the connecting member 133 is locked to the bracket 131, and the upper connecting portion 133 c is locked to the locking portion 134 d of the marker operation lever 134. A washer 135, a rotation fulcrum part 132b of the marker operating lever 134, and a washer 136 are inserted in order into the right rotation fulcrum shaft 111m of the right side frame 111e. A pin 137 is locked to the right rotation fulcrum shaft 111m behind the washer 136. A spring 138 is stretched between the bracket 131 and the connecting portion 28d of the right rear frame 28R.

The right marker mechanism 130 can be switched to any one of “non-working state”, “working state”, and “storing state”.
Since each state of the right marker mechanism 130 is the same as each state of the left marker mechanism 120, detailed description is omitted.

  When the right marker mechanism 130 is in the “working state”, when the planting operation is performed by the walking type rice transplanter 1, the walking type rice transplanter 1 proceeds in a state where the action portion 132c of the marker 132 is in contact with the farm scene. As a result, a reference line parallel to the path traveled by the walking type rice transplanter 1 is drawn on the trace (left side of the path traveled by the walking type rice transplanter 1) of the action unit 132c in contact with the field scene.

  When the right marker mechanism 130 is in the “retracted state”, since the right marker mechanism 130 is stored within the left and right widths of the lower frame 111a, the possibility of contact with an obstacle when the walking type rice transplanter 1 is traveling is reduced. It is possible. In addition, it is possible to save space when transporting by loading on a truck bed, etc., or when storing, making it easy to carry and store, and to make effective use of space. It becomes possible.

As described above, the walking type rice transplanter 1 according to the present embodiment is rotatably supported by the handle frame 111 connected to the body 2 via the rotation fulcrum portion 122b provided at one end, and the other end is supported. A walking type rice transplanter 1 including a marker 122 that can be switched to a working state in which a reference line is drawn on a farm scene by contacting the farm field, or a non-working state in which the other end is separated from the farm field. A connecting part (first connecting part) 121P provided to rotate, a connecting part (second connecting part) 28b provided integrally with the handle frame 111, and a tension between the connecting part 121P and the connecting part 28b. When the pivot fulcrum portion 122b is positioned on one side of a straight line connecting the connecting portion 121P and the connecting portion 28b when viewed in the axial direction, the marker 122 is urged and held in the working state. Dynamic fulcrum A spring (biasing member) 128 that biases the marker 122 and holds it in the non-working state when 122b is located on the other side of the straight line connecting the connecting portion 121P and the connecting portion 28b when viewed from the axial direction; It comprises.
With this configuration, it is possible to simplify the structure and reduce the manufacturing cost compared to the conventional case. That is, it is not necessary to provide a complicated mechanism such as a stopper for holding the marker 122 in the working state or the non-working state, and the structure can be simplified and the manufacturing cost can be reduced. Further, even when an external force is applied to the marker 122 by the biasing force of the spring 128, the marker 122 can be held in the working state or the non-working state.

Further, the walking type rice transplanter 1 includes a bracket 121 supported by the handle frame 111 so as to be rotatable around the rotation fulcrum portion 122b, and a marker operation supported by the handle frame 111 so as to be rotatable in the same direction as the marker 122. A lever (operating tool) 124 and a connecting member 123 that connects the bracket 121 and the marker operating lever 124 are provided. The marker 122 is sandwiched between the bracket 121 and the connecting member 123 and cannot be rotated relative to the bracket 121. To be held.
By configuring in this way, by configuring a mechanism (left marker mechanism 120) that switches the marker 122 to a working state or a non-working state by a combination of the bracket 121, the marker 122, the connecting member 123, and the marker operating lever 124, It is possible to reduce the number of parts of the fastener for connecting the respective members, and it is possible to reduce the manufacturing cost.

Further, the connecting member 123 has flexibility that can change a linear distance between one end on the bracket 121 side and the other end on the marker operation lever 124 side, and when the marker 122 is in the non-working state, the connecting fulcrum The portion 122b is located on one side of a straight line connecting the one end and the other end of the connecting member 123 when viewed from the axial direction, the connecting member 123 is curved, and the rotation fulcrum portion 122b is viewed from the axial direction. When the link member 123 is located on the other side of the straight line connecting the one end and the other end, the connecting member 123 holds the marker 122 in a retracted state in which the marker 122 is rotated further inside the machine body 2 than in the non-working state.
By configuring in this way, it is possible to save space during storage and transportation by holding the marker 122 in the storage state. In addition, the marker 122 can be held in a stored state with a simple configuration, and the manufacturing cost can be reduced. In the present embodiment, when the marker 122 is in the stored state, the left marker mechanism 120 can be stored inside the handle frame 111.

Further, the bracket 121 restricts the rotation of the marker 122 due to the urging force of the spring 128 by contacting the handle frame 111 in the working state, and restores the connecting member 123 by contacting the handle frame 111 in the retracted state. The rotation of the marker 122 by force is restricted.
With this configuration, the position of the marker 122 in the storage state and the working state can be determined at a predetermined position. Accordingly, it is possible to reliably perform the work of drawing the reference line in the work state and the storage of the marker 122 in the storage state. In addition, it is possible to position the storage state and the working state without requiring additional components, and it is possible to reduce the manufacturing cost.

Hereinafter, the fuel tank 14 will be described with reference to FIGS. 3, 4, and 16 to 18.
The fuel tank 14 stores fuel used by the walking type rice transplanter 1. The fuel tank 14 is disposed above the mission case 23 and behind the engine 3 (see FIGS. 3 and 4).
As shown in FIG. 16, the fuel tank 14 includes a fuel tank main body 141, a filter 142, a cap 143, and a packing 144.

  The fuel tank body 141 is a substantially box-shaped member that stores fuel. A fuel supply port 141 a is provided in the upper part of the fuel tank body 141. The fuel filler port 141 a is formed in a substantially cylindrical shape, and the fuel filler port 141 a is projected upward from the fuel tank main body 141. A screw portion 141b is formed on the outer peripheral portion of the fuel filler port 141a. A filter 142 is attached to the fuel filler port 141a to prevent impurities (dust and dust) from entering the fuel tank main body 141 from the fuel filler port 141a.

As shown in FIGS. 16 and 17, the cap 143 closes the fuel supply port 141 a of the fuel tank main body 141. The cap 143 is formed in a bottomed cylindrical shape including a cylindrical cylindrical portion 143a and a bottom portion 143b.
A threaded portion 143c is formed on the inner peripheral surface of the cylindrical portion 143a. Grooves 143d and 143d are formed in a part of the screw part 143c (in this embodiment, two places at intervals of 180 degrees) in the longitudinal direction of the cylindrical part 143a.
An inner cylinder part 143e having an outer diameter smaller than the inner diameter of the cylinder part 143a is formed on the bottom part 143b. A notch 143f is formed in a part of the lower end of the inner cylinder part 143e (in this embodiment, one position at a position not facing the grooves 143d and 143d of the cylinder part 143a).

As shown in FIGS. 16 and 18, the packing 144 is interposed between the fuel tank main body 141 and the cap 143, and prevents the fuel from leaking out from the fuel tank main body 141. The packing 144 has a flange 144a provided with a hole in the center of the disk, and a cylindrical tube having an inner diameter slightly larger than the hole of the flange 144a and formed downward from the center of the flange 144a. A portion 144b and a bottom portion 144c that closes the bottom of the cylindrical portion 144b.
Grooves 144d, 144d,... In the longitudinal direction of the cylindrical portion 144b are formed in a part of the inner peripheral surface of the cylindrical portion 144b and a part of the holes of the flange portion 144a (in this embodiment, four positions at intervals of 90 degrees).・ ・ Is formed.
The center portion of the bottom portion 144c is formed so as to protrude downward as compared with the outer peripheral portion. A through hole 144e is formed in the center of the bottom portion 144c so as to penetrate the bottom portion 144c vertically.

  In such a fuel tank 14, as shown in FIG. 16, the inner cylinder portion 143 e of the cap 143 is inserted into the cylinder portion 144 b of the packing 144, and the flange portion 144 a of the packing 144 is inserted into the cylinder portion 143 a of the cap 143. By fitting, the cap 143 and the packing 144 are integrally fixed. When the cap 143 and the packing 144 are fixed integrally, the lower end of the inner cylinder portion 143e of the cap 143 is brought into contact with the bottom portion 144c of the packing 144. By fastening the threaded portion 143c of the cap 143 with which the packing 144 is integrated with the threaded portion 141b of the fueling port 141a of the fuel tank body 141, the fueling port 141a can be closed.

  As described above, when the cap 143 is attached to the fuel tank main body 141, the air in the fuel tank 14 passes through the through-hole 144e of the packing 144, the notch 143f of the cap 143, the grooves 144d, 144d,. It can be discharged to the outside through the gap between the flange portion 144a of the packing 144 and the bottom portion 143b of the cap 143, and the grooves 143d and 143d of the cap. In this way, it is possible to prevent damage to the fuel tank 14 and the like by discharging the warmed air in the fuel tank 14 and the vaporized fuel to the outside of the fuel tank 14.

DESCRIPTION OF SYMBOLS 1 Walking type rice transplanter 2 Body 3 Engine 4L Left wheel 4R Right wheel 5 Planting device 6 Seedling supply device 7 Transmission mechanism 11 Operation part 28b Connection part (2nd connection part)
28d connecting part (second connecting part)
28L Left rear frame 28R Right rear frame 111 Handle frame 120 Left marker mechanism 121 Bracket 121P Connecting portion (first connecting portion)
122 Marker 123 Connecting member 124 Marker operating lever (operating tool)
128 Spring (biasing member)
130 Right Marker Mechanism 131 Bracket 132 Marker 133 Connecting Member 134 Marker Operation Lever (Operation Tool)
138 Spring (biasing member)

Claims (4)

The handle frame connected to the machine body is rotatably supported via a rotation fulcrum provided at one end, and the other end is brought into contact with the field and the work line is drawn in the field scene, or the other end is A walking type rice transplanter equipped with a marker that can be switched to a non-working state separated from the field,
A first connecting portion provided to rotate integrally with the marker;
A second connecting portion provided integrally with the handle frame;
It is stretched between the first connecting part and the second connecting part, and the rotation fulcrum part is a straight line connecting the first locking part and the second locking part when viewed from the axial direction. When positioned on one side, the marker is urged and held in the working state, and the rotation fulcrum portion is a straight line connecting the first locking portion and the second locking portion as viewed from the axial direction. A biasing member that biases the marker and holds it in the non-working state, when located on the other side;
A walking type rice transplanter. A bracket supported on the handle frame so as to be rotatable around the rotation fulcrum,
An operating tool supported by the handle frame so as to be rotatable in the same direction as the marker; and a connecting member for connecting the bracket and the operating tool;
Comprising
The walking type rice transplanter according to claim 1, wherein the marker is sandwiched between the bracket and the connecting member and is held by the bracket so as not to be relatively rotatable. The connecting member has flexibility capable of changing a linear distance between one end on the bracket side and the other end on the operation tool side,
When the marker is in the non-working state, the rotation fulcrum portion is located on one side of a straight line connecting one end and the other end of the connecting member when viewed from the axial direction thereof,
When the connecting member is curved and the pivot fulcrum portion is located on the other side of a straight line connecting one end and the other end of the connecting member when viewed from the axial direction, the connecting member moves the marker to the non-working state. The walking type rice transplanter according to claim 2, wherein the walking type rice transplanter is held in a storage state that is further rotated to the inside of the machine body. The bracket is
Restricting the rotation of the marker by the biasing force of the biasing member by contacting the handle frame in the working state;
The walking type rice transplanter according to claim 3, wherein rotation of the marker by the restoring force of the connecting member is regulated by contacting the handle frame in the storage state.

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