JP5431113B2 - 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 a change in traveling speed of a walking type rice transplanter and a change between stocks with separate operation tools.

  Conventionally, walking that has a transmission mechanism that changes the driving force of the engine and transmits it to the wheels, that is, changes the traveling speed, and changes the driving force of the engine and transmits it to the planting device, that is, changes between the stocks. Type rice transplanters are known.

  As an example of such a walking type rice transplanter, there is one that mainly includes a transmission mechanism housed in a mission case and two transmission shafts projecting from the mission case. It is possible to change the traveling speed by operating one of the two transmission shafts, and it is possible to change between the stocks by operating the other transmission shaft.

  Such a walk-type rice transplanter generates oil leakage due to mud and dust being caught in the sliding part between the transmission shaft and the transmission case, and mud and dust from the sliding part into the transmission case. There was a need to prevent intrusion.

  As another example of the walking type rice transplanter, a technique described in Patent Document 1 is known.

  The walking type rice transplanter described in Patent Document 1 protrudes from the transmission case, changes the traveling speed when operated in the axial direction, and changes the stock distance when rotated around the axis. A travel operation tool that is arranged at a position that can be operated by the worker who is working and slides the transmission shaft in the axial direction, and a travel operation tool that is arranged at a position that can be operated by the worker who is working, and the transmission shaft is rotated around the axis. And an inter-strain operation tool that performs a rotation operation.

  In this way, by making one transmission shaft projecting from the transmission case, the possibility of mud or dust biting into the sliding portion between the transmission shaft and the transmission case is reduced, and oil leakage occurs, It is possible to prevent mud and dust from entering the mission case.

  However, in the case of the walking type rice transplanter described in Patent Document 1, since the two operating tools, that is, the traveling operating tool for operating the transmission shaft and the inter-plant operating tool, are arranged at the operator's hand, seedling planting work During the operation, the operator needs to determine which of the two operating tools should be operated according to the purpose, and hold and operate one of the selected operating tools. And there is a possibility that the operation tool may be erroneously operated, which is disadvantageous in that the operation is complicated and workability is deteriorated.

  Moreover, the technique of patent document 2 is known as another example of the walk type rice transplanter which solves the problem which the walk type rice transplanter of patent document 1 has.

  The walking type rice transplanter described in Patent Document 2 includes one shift operation tool that changes the running speed by operating in the vertical direction and changes between the stocks by operating in the left-right direction.

  As described above, since it is possible to change the running speed and change between the stocks by operating one shift operating tool, the number of operating tools arranged at the operator's hand is reduced and the operability is improved. Can be achieved.

  However, in the case of the walking type rice transplanter described in Patent Document 2, since the travel speed is changed and the stock is changed with one shift operation tool, the operation method of the shift operation tool becomes complicated and workability is deteriorated. It was disadvantageous in that it did. In particular, in seedling planting work in one field (paddy field), even if the running speed is often changed during the work, there is almost no change between the stocks during the work. In other words, even though there is no change between stocks in the middle of work, it is possible to change between stocks at the operator's hand, so the problem is that the operation method of the shift operation tool is more complicated than necessary. was there. In addition, when changing the running speed and changing between stocks when turning around or replenishing seedlings in the middle of planting work, the operator may forget the stock before the change, and work in the same field There was also a risk that the stock will be changed during the period.

Japanese Utility Model Publication No.59-81310 JP-A-8-214649

  An object of the present invention is to provide a walking type rice transplanter capable of easily and accurately changing a running speed and changing between stocks and improving workability.

  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 claim 1, a walking type rice transplanter comprising: a planting device for planting seedlings in a field; and a transmission mechanism for shifting power transmitted from an engine and transmitting the wheels to the planting device. The transmission mechanism changes the transmission gear ratio of the power transmitted to the wheels by being slid in the axial direction, and the transmission mechanism is rotated by rotating around the axis. A speed change operation shaft for changing the speed ratio of the power transmitted to the first position, a first operation tool that is disposed at a position that can be reached by an operator during planting work, and that slides the speed change operation shaft in the axial direction; A second operating tool that is disposed at a position that cannot be reached by a worker who is performing an attaching operation and that rotates the speed change operation shaft about an axis.

  In claim 2, in conjunction with the speed change operation shaft, the transmission mechanism moves in the axial direction of the speed change operation shaft or rotates around the axis, and the transmission mechanism is based on the position of the instruction member. And a display member for displaying a transmission gear ratio transmitted to the wheels and a transmission gear ratio transmitted from the transmission mechanism to the planting device.

  The present invention has an effect that it is possible to easily and accurately change the running speed and change between stocks, and to improve workability.

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 disassembled perspective view which shows the transmission mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The left side sectional view showing the speed change mechanism of one embodiment of the walk type rice transplanter concerning the present invention. The plane sectional view showing the speed change mechanism of one embodiment of the walk type rice transplanter concerning the present invention. The disassembled perspective view which shows the speed change operation mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The top view which shows the speed change operation mechanism of one Embodiment of the walk type rice transplanter which concerns on this invention. The left view which shows the speed change operation mechanism of one Embodiment 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. 13 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, a speed change mechanism 11 (see FIG. 8), a speed change operation mechanism 13 (see FIG. 11), and an operation unit 15 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 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.
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 in a rotatable manner and transmits 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 rotatably supports the left planting arm portion 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-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.

  The engine 3 shown in FIG. 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 drive arm and an interlocking arm (not shown), and the like. It is composed.
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 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 cut out a predetermined amount of seedlings of a seedling supply device 6 (front end part of the seedling mounting base 61) to be described later. The seedlings are planted in the field by performing a series of operations for transplanting to the 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 (FIG. 6), 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 and is fixed to the seedling table frame (the handle frame 151 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 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 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 A rear transmission shaft 95L, a right rear transmission shaft 95R, bevel gears 96L and 96R, bevel gears 97L and 97R, a left planting arm shaft 98L, a right planting arm shaft 98R, and bevel gears 99L and 99R are provided.

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 8a protruding leftward from the main body of the hydraulic pump 8 so as not to be relatively rotatable.
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 a spring (not shown), a predetermined magnitude of tension is applied to the belt 71c.

  The driving force generated in the engine 3 is transmitted to the hydraulic pump 8 through the pulley 71a, the belt 71c, and the pulley 71b. That is, when the output shaft 3a of the engine 3 rotates, the pulley 71a, the belt 71c, the pulley 71b, and the input shaft 8a of the hydraulic pump 8 rotate, and the hydraulic pump 8 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 main clutch mechanism (not shown) can apply a predetermined magnitude of tension to the belt 72c.

  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 stocks) of seedlings in the advancing direction planted by the walking type rice transplanter 1, and “the number of teeth of the gear 73c <the number of teeth of the gear 73d <the number of teeth of the gear 73e”. 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-shaped 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-shaped 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. 7, the left side clutch shifter 79L and the right side clutch shifter 79R are substantially cylindrical 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. 7, 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 a 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.

When an external force is applied to the planting clutch pawl 90b, the planting clutch pawl 90b moves to the right (in a direction away from the planting clutch gear 90a) against the urging force of the planting clutch spring 90c, and is formed in the planting clutch gear 90a. The engaged portion and the engaging portion formed on the planting clutch pawl 90b are released, and 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 portion 51L and the center right planting arm portion 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 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 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 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.
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 field).
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.

Hereinafter, the operation unit 15 will be described with reference to FIGS. 2 to 4.
The operation unit 15 is for an operator to operate each unit of the walking type rice transplanter 1.
The operation unit 15 includes a handle frame 151, a main clutch lever 152, a left side clutch lever 153L, a right side clutch lever 153R, a planting clutch lever 154, a swing lever 155, and a seedling amount adjustment lever 156.

The handle frame 151 is a main structure of the operation unit 15 and is fixed to the rear part of the machine body 2.
The handle frame 151 includes a lower frame 151a, a center frame 151b, an upper frame 151c, a left side frame 151d, and a right side frame 151e.

The lower frame 151 a is a member that forms the lower part of the handle frame 151.
The center frame 151b is a member that forms the center portion of the handle frame 151. The midway part of the center frame 151b is fixed to the center part (left and right center part) of the lower frame 151a.
The upper frame 151 c is a member that forms the upper part of the handle frame 151. A midway portion of the upper frame 151c is fixed to the other end portion of the central frame 151b.
The left side frame 151 d is a member that forms the left side of the handle frame 151. One end (lower end) of the left frame 151d is fixed to one end (left end) of the lower frame 151a. The other end (upper end) of the left frame 151d is fixed to the upper frame 151c.
The right side frame 151e is a member that forms the right side of the handle frame 151. One end (lower end) of the right side frame 151e is fixed to the other end (right end) of the lower frame 151a. The other end (upper end) of the right frame 151e is fixed to the upper frame 151c.
The handle frame 151 is fixed to the left rear frame 28L, the right rear frame 28R, and the central planting case 27C.

The main clutch lever 152 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 152 is rotatably supported at a position slightly leftward in the middle of the upper frame 151c.
A base end portion of the main clutch lever 152 is connected to a main clutch mechanism (not shown) via a link mechanism (not shown).
When the main clutch lever 152 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 152 is operated to “OFF”, 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 left side clutch lever 153L and the right side clutch lever 153R 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 153L is rotatably supported at the lower portion of the left end portion of the upper frame 151c.
The left side clutch lever 153L is connected to the left side clutch shifter 79L (more specifically, the left side clutch hawk 153a (see FIG. 7)) via a link mechanism (not shown).
The operator holds the left side clutch lever 153L in a gripped state (holds the left side clutch lever 153L 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 153R is rotatably supported on the lower portion of the right end portion of the upper frame 151c.
The right side clutch lever 153R is connected to a right side clutch shifter 79R (more specifically, the right side clutch hawk 153b (see FIG. 7)) via a link mechanism (not shown).
The operator holds the right side clutch lever 153R while holding it (holds the right side clutch lever 153R 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 153L nor the right side clutch lever 153R, the walking type rice transplanter 1 can go straight.
When the operator holds the left side clutch lever 153L and does not hold the right side clutch lever 153R, the walking type rice transplanter 1 can turn left.
When the operator holds the right side clutch lever 153R and does not hold the left side clutch lever 153L, the walking rice transplanter 1 can turn right.
When the worker holds both the left side clutch lever 153L and the right side clutch lever 153R, the walking rice transplanter 1 cannot go straight.

The planting clutch lever 154 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 154 is rotatably supported at a position slightly to the right of the middle portion of the upper frame 151c “in a direction in which the distal end portion of the planting clutch lever 154 tilts in the front-rear direction”.
The proximal end portion of the planting clutch lever 154 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 154 is connected to the planting clutch hawk 154a (see FIG. 7) via a link mechanism (not shown).
The planting clutch hawk 154a changes the state of the planting clutch 90 to “ON (a state in which a driving force can be transmitted from the engine 3 to the planting device 5 and the seedling supply device 6)” or “OFF” (the engine 3 to the planting device 5). And a state in which the driving force cannot be transmitted to the seedling supply device 6).
When the planting clutch hawk 154a 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 154a is engaged with the planting clutch claw 90b, the state of the planting clutch 90 is held at “OFF”.
The operator turns the planting clutch lever 154 so that the tip of the planting clutch lever 154 tilts forward (sets the planting clutch lever 154 to “ON”), thereby setting the state of the planting clutch 90 to “ON”. It is possible to hold it.
The operator turns the planting clutch lever 154 so that the tip of the planting clutch lever 154 tilts backward (turns the planting clutch lever 154 to “OFF”), thereby changing the state of the planting clutch 90 to “OFF”. It is possible to hold it.

The swing lever 155 is a lever for operating the vehicle height of the walking type rice transplanter 1.
The base end portion of the swing lever 155 is rotatably supported at a position slightly to the right of the middle portion of the upper frame 151c and next to the right of the planting clutch lever 154.
The base end portion of the swing lever 155 is connected to a pitching control mechanism (not shown) via a link mechanism (not shown).
The operator switches the state between “automatic swing”, “manual swing”, and “interlocked swing” by rotating the swing lever 155 so that the tip of the swing lever 155 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.
“Manual swing” is a state in which the adjustment of the vehicle height by the operator operating the swing lever 155 has priority over the vehicle height control by the pitching control mechanism (not shown).
The “interlocking swing” is a pitching control mechanism (not shown) when the operator sets the planting clutch lever 154 to “ON” (when the driving force can be transmitted from the engine 3 to the planting device 5 and the seedling supply device 6). ) Controls the vehicle height of the walking type rice transplanter 1, and when the operator turns the planting clutch lever 154 to "OFF", the vehicle height is raised in conjunction with the operation.

The seedling amount adjusting lever 156 is a seedling amount, that is, a seedling mat on which the center left planting arm portion 51L, the center right planting arm portion 51R, the left planting arm portion 52L, and the right planting arm portion 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 156 is rotatably supported on the right side surface of the middle portion of the center frame 151b. The base end portion of the seedling removal amount adjusting lever 156 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 155 so that the tip of the seedling collection amount adjusting lever 156 is tilted in the vertical direction.

Hereinafter, the speed change mechanism 11 will be described with reference to FIGS. 8 to 10.
The transmission mechanism 11 is a mechanism for changing the positions of the transmission gear 75 and the inter-company transmission gear 88 in the transmission mechanism 7.
The speed change mechanism 11 includes a speed change operation shaft 111, an engagement member 112, a first travel speed change arm 113, a second travel speed change arm 114, a travel speed change fork shaft 115, a travel speed change fork 116, a ball 117, a spring 118, and a stock shift speed arm 119. , A stock change fork shaft 120, a stock change fork 121, a ball 122, and a spring 123.

  The speed change operation shaft 111 transmits an operation force by an operator. The speed change operation shaft 111 is inserted into the inside through an insertion hole formed in the rear surface of the transmission case 23 (right side member 23R) via the oil seal 23a. The rear end portion of the speed change operation shaft 111 protrudes from the mission case 23. The speed change operation shaft 111 is supported by the mission case 23 so as to be rotatable about an axis and slidable in the axial direction. A plate-like portion 111 a having a pair of left and right side surfaces is formed at the rear end of the speed change operation shaft 111.

  The engaging member 112 is a substantially cylindrical member having through holes formed in the front-rear direction. A pair of flange portions having an outer diameter larger than that of the front and rear center portions are formed at both front and rear end portions of the engagement member 112, and an engagement groove 112 a is formed between the pair of front and rear flange portions of the engagement member 112. The The speed change operation shaft 111 is inserted through the through hole of the engaging member 112. The engaging member 112 is supported by the speed change operation shaft 111 so as not to be relatively rotatable and to be slidable.

  The first traveling speed change arm 113 is rotated by the engaging member 112. The first traveling speed change arm 113 includes a generally elliptical main plate 113a, a cylindrical portion 113b, and a columnar engaging portion 113c. The main plate 113a is disposed with the plate surface facing up and down. A cylindrical portion 113b is fixed to one end side of the main plate 113a so as to penetrate the main plate 113a in the vertical direction. An engaging portion 113c is erected on the other end side of the upper surface of the main plate 113a. The engaging portion 113 c is engaged with the engaging groove 112 a of the engaging member 112.

  The second traveling speed change arm 114 rotates together with the first traveling speed change arm 113. The second traveling speed change arm 114 includes a cylindrical portion 114a and an engagement plate 114b having one end formed in a generally tapered shape. The cylindrical portion 114a is arranged with its axial direction as the vertical direction. The other end of the engagement plate 114b is fixed to the lower end of the cylindrical portion 114a. The middle part of the columnar part 114 a is rotatably supported by the mission case 23, and the upper end part (the part above the part supported by the mission case 23) is inserted into the cylindrical part 113 b of the first traveling speed change arm 113. . The columnar portion 114a is fixed to the first traveling speed change arm 113 so as not to be relatively rotatable and to be slidable.

  The travel speed change fork shaft 115 supports the travel speed change fork 116. The traveling speed change fork shaft 115 is arranged with its axial direction as the left-right direction, and is supported by the transmission case 23 so as not to rotate. On the outer peripheral surface of the traveling speed change fork shaft 115 is formed a groove portion 115a in which a plurality of grooves are arranged at predetermined intervals in the axial direction.

  The traveling speed change fork 116 is engaged with the speed change gear 75. The traveling speed change fork 116 includes a through hole 116a formed in the left-right direction, an engagement portion 116b formed with a substantially semicircular concave portion at an end portion, and an engagement groove 116c having a concave shape when viewed from the front. The travel transmission fork shaft 115 is inserted into the through hole 116a, and the travel transmission fork 116 is supported by the travel transmission fork shaft 115 so as to be slidable in the left-right direction. The engaging portion 116 b engages with the transmission gear 75. An engagement plate 114b of the second traveling speed change arm 114 is engaged with the engagement groove 116c.

  The ball 117 and the spring 118 are accommodated in a hole (not shown) formed in the traveling speed change fork 116 so as to be orthogonal to the through hole 116a. The spring 118 biases the ball 117 toward the traveling speed change fork shaft 115 in a state where the ball 117 is inserted into the through hole 116a. When a part of the ball 117 protrudes from the hole of the traveling speed change fork 116 and engages with any of the grooves 115a, the relative position of the traveling speed change fork 116 with respect to the travel speed change fork shaft 115 is held at that position. It becomes easy.

  The inter-stock transmission arm 119 is rotated by the transmission operation shaft 111 and is moved in the front-rear direction. The inter-stock transmission arm 119 includes a cylindrical portion 119a and an engagement plate 119b having one end formed in a generally tapered shape. The cylindrical portion 119a is disposed with its opening portion directed in the front-rear direction. The other end of the engagement plate 119b is fixed to the lower side of the front end of the cylindrical portion 119a. The speed change operation shaft 111 is inserted through the cylindrical portion 119a. The cylindrical portion 119a is fixed to the speed change operation shaft 111 so as not to be relatively rotatable and slidable. The engagement plate 119b is disposed with one end thereof generally directed downward.

  The stock shifting fork shaft 120 supports the stock shifting fork 121. The inter-stock transmission fork shaft 120 is supported by the transmission case 23 so as not to rotate with its axial direction directed in the left-right direction. A groove portion 120a is formed on the outer peripheral surface of the inter-stock transmission fork shaft 120 by arranging a plurality of grooves at predetermined intervals in the axial direction.

  The stock shift fork 121 is engaged with the stock shift gear 88. The inter-stock transmission fork 121 includes a through hole 121a formed in the left-right direction, an engagement portion 121b formed with a substantially semicircular recess at the end, and an engagement groove 121c that is concave in front view and opens upward. A stock shift fork shaft 120 is inserted into the through-hole 121a, and the stock shift fork 121 is supported by the stock shift fork shaft 120 so as to be slidable in the left-right direction. The engaging portion 121b engages with the inter-strain transmission gear 88. An engagement plate 119b of the inter-stock transmission arm 119 is engaged with the engagement groove 121c.

  The ball 122 and the spring 123 are accommodated in a hole (not shown) formed in the inter-stock transmission fork 121 so as to be orthogonal to the through hole 121a. The spring 123 biases the ball 122 toward the inter-stock shift fork shaft 120 in a state where the ball 122 is inserted into the through hole 121a. When a part of the ball 122 protrudes from the hole of the inter-company transmission fork 121 and engages with any of the grooves 120a, the relative position of the inter-company transmission fork 121 with respect to the inter-company transmission fork shaft 120 is held at that position. It becomes easy.

Below, the operation | movement aspect of the transmission mechanism 11 is demonstrated using FIG.9 and FIG.10.
First, the case where the position of the transmission gear 75 is changed will be described.

When the speed change operation shaft 111 is slid in the axial direction (front-rear direction), the engaging member 112 moves in the front-rear direction together with the speed change operation shaft 111.
When the engagement member 112 moves in the front-rear direction, the engagement portion 113c also moves in the front-rear direction together with the engagement member 112, and the first traveling speed change arm 113 rotates about the cylindrical portion 113b.
When the first traveling speed change arm 113 is rotated, the second traveling speed change arm 114 is also rotated together with the first traveling speed change arm 113.
When the second travel speed change arm 114 rotates, the travel speed change fork 116 is slid in the axial direction (left and right direction) of the travel speed change fork shaft 115 by the engagement plate 114b engaged with the engagement groove 116c of the travel speed change fork 116. The
When the travel transmission fork 116 slides in the left-right direction, the transmission gear 75 moves on the transmission shaft 74 together with the travel transmission fork 116.

  Thus, by changing the position of the transmission gear 75 with respect to the transmission shaft 74, the walking type rice transplanter 1 travels and stops, the travel direction (forward and reverse), and the travel speed during forward travel (first forward speed and second forward speed). Speed) can be switched (that is, the traveling speed can be changed).

  Each groove of the groove 115a of the traveling speed change fork shaft 115 is formed at a position corresponding to the position of the speed change gear 75 with respect to the speed change shaft 74 (from "first position from left to fourth position from left"). Has been. As a result, the traveling speed change fork 116 can be held at each position.

  Next, the case where the position of the inter-stock transmission gear 88 is changed will be described.

When the speed change operation shaft 111 is turned around the axis, the inter-stock speed change arm 119 is also turned around the cylindrical portion 119a together with the speed change operation shaft 111.
When the inter-company transmission arm 119 rotates, the inter-company transmission fork 121 is slid in the axial direction (left-right direction) of the inter-company transmission fork shaft 120 by the engagement plate 119b engaged with the engagement groove 121c of the inter-company transmission fork 121.
When the stock shift fork 121 slides in the left-right direction, the stock shift gear 88 moves on the stock shift shaft 85 together with the stock shift fork 121.

  Thus, by changing the position of the inter-shaft transmission gear 88 with respect to the inter-shaft transmission shaft 85, it is possible to switch (change) between the stocks of the walking type rice transplanter 1.

  Each groove of the groove portion 120a of the inter-stock transmission fork shaft 120 corresponds to the position of the inter-stock transmission gear 88 relative to the inter-stock transmission shaft 85 (from "first position from left to fifth position from left"). Is formed. As a result, the inter-stock shift fork 121 can be held at each position.

  Further, when the speed change operation shaft 111 is slid in the axial direction, the engagement plate 119b of the stock shift arm 119 moves within the front-rear width of the engagement groove 121c of the stock shift fork 121. As a result, regardless of the position of the speed change operation shaft 111 in the axial direction, the engagement plate 119b and the engagement groove 121c are engaged, and if the speed change operation shaft 111 is rotated, the stock shift fork 121 is slid in the left-right direction. Can do.

  As described above, by operating the speed change operation shaft 111, it is possible to change the traveling speed and change between stocks. As a result, only one of the speed change operation shafts 111 needs to be protruded from the inside of the mission case 23 in spite of the two speed changes of the traveling speed and the change between stocks. In the insertion hole formed on the rear surface, the possibility of mud and dust getting caught in the sliding part between the transmission case 23 and the speed change operation shaft 111 is reduced, oil leakage occurs, mud and dust in the mission case. Etc. can be suppressed.

Hereinafter, the shift operation mechanism 13 will be described with reference to FIGS. 11 to 13.
The speed change operation mechanism 13 is a mechanism for sliding the speed change operation shaft 111 in the speed change mechanism 11 in the axial direction and rotating about the axis.
The shift operation mechanism 13 includes a travel shift lever guide 131, a shift rod 132, a bolt 133, a nut 134, a stock shift lever 135 as a second operation tool, a travel shift lever fulcrum member 136, and a travel shift lever 137 as a first operation tool. , A washer 138, a spring 139, a lever guide seat 140, an instruction pin 141 as an instruction member, and a display member 142 as a display member.

  As shown in FIG. 11, the travel shift lever guide 131 indicates the operating direction of the travel shift lever 137 to the operator and guides the travel shift lever 137. The travel shift lever guide 131 is formed of a metal plate, a resin plate, or the like, and is arranged with the rear plate surface facing rearward and upward. A guide hole 131a is formed in the travel speed changer guide 131 in the left-right direction. The travel transmission lever guide 131 is fixed to the upper part of the central planting case 27C via a vertical feed case 65. The vertical feed case 65 is a member that houses the vertical feed device 62 of the seedling supply device 6.

As shown in FIG. 11 to FIG. 13, the speed change rod 132 transmits the operation force by the operator to the speed change operation shaft 111. The transmission rod 132 includes a main plate 132a, connecting plates 132b and 132c, a cylindrical portion 132d, flange portions 132e and 132f, and an engaging groove 132g.
The main plate 132a is a plate material formed in an approximately elliptical shape. The main plate 132a is arranged with the plate surface facing forward and backward, and the longitudinal direction thereof being substantially directed left and right.
The connecting plates 132b and 132c are a pair of left and right plate members that project forward from the front surface of the main plate 132a. One connecting plate 132b is disposed on the left side of the left and right center of the main plate 132a, and the other connecting plate 132c is disposed on the right side of the left and right center of the main plate 132a. These left and right connecting plates 132b and 132c are provided to face each other with a predetermined interval therebetween.
The cylindrical portion 132d is a substantially cylindrical member that protrudes rearward from the rear surface of the main plate 132a. The cylindrical portion 132d is disposed at the left and right center of the main plate 132a.
The flange portions 132e and 132f are a pair of front and rear circular plates having a diameter larger than the diameter of the cylindrical portion 132d, formed at the rear end and the front and rear halfway portion of the cylindrical portion 132d. A gap having a predetermined interval is provided between the flange portions 132e and 132f.
The engaging groove 132g is a groove formed between the flange portions 132e and 132f.

  Between the left and right connecting plates 132b and 132c, a plate-like portion 111a of the speed change operation shaft 111 outside the mission case 23 is inserted. The bolt 133 is inserted through the right connecting plate 132c, the plate-like portion 111a, and the left connecting plate 132b in this order, and is fastened by the nut 134 on the left side of the connecting plate 132b, so that the speed change operation shaft 111 and the speed change rod 132 are connected. Connected. At this time, the speed change operation shaft 111 and the cylindrical portion 132d of the speed change rod 132 are arranged on the same axis.

  The stock shifting lever 135 is for rotating the shifting rod 132 about its axis. The inter-strain shift lever 135 is formed by bending a columnar member, and is arranged with its axial direction being substantially vertical. The lower end of the inter-stock transmission lever 135 is fixed to the upper outer peripheral surface of the cylindrical portion 132d of the transmission rod 132. By bending a midway portion in the longitudinal direction of the inter- stock transmission lever 135, the upper portion of the inter- stock transmission lever 135 is tilted to the left with respect to the lower portion. A grip for an operator to grip is attached to the upper end portion of the inter-stock shift lever 135. The inter-strain shift lever 135 cannot be operated from the shift rod 132 because it does not reach the operator who is located behind the machine body 2 during the seedling planting work by the walking type rice transplanter 1 using the operation unit 15. However, this operation is extended to a position where it can be operated from an operator who has moved to the side of the machine body 2 (in the present embodiment, leftward in the traveling direction) by interrupting this operation. An operator can operate the stock shift lever 135 while standing on the left side of the walking type rice transplanter 1 (more specifically, on the left side of the engine platform 21 and in front of the left side frame 26L).

In the present embodiment, the upper part of the inter-strain shift lever 135 is tilted to the left so that the inter-strain shift lever 135 does not protrude significantly to the right from the center frame 24 in plan view. This prevents the right axle case 25R from interfering with the stock shift lever 135 when it rotates up and down.
In addition, the shape and arrangement | positioning of the inter-stock transmission lever 135 are not restricted to the thing of this embodiment, The shape and arrangement | positioning which an operator can stand and operate on the right side of the walk type rice transplanter 1 may be sufficient.

The travel shift lever fulcrum member 136 transmits the operation force by the operator to the shift rod 132. The travel shift lever fulcrum member 136 includes a cylindrical portion 136a and engagement plates 136b and 136c.
The cylindrical portion 136 a is inserted into a columnar rotation fulcrum member 24 a erected on the upper surface of the center frame 24. The rotation fulcrum member 24 a is disposed on the left and right halfway and on the left side of the center frame 24.
The engagement plates 136b and 136c are a pair of upper and lower plates that project from the cylindrical portion 136a to the right. The upper engagement plate 136b is disposed in the vicinity of the upper end of the cylindrical portion 136a, and the lower engagement plate 136c is disposed below the upper engagement plate 136b so as to face the engagement plate 136b at a predetermined interval. The right end sides of the engagement plates 136b and 136c are formed in a tapered shape, and the right end is formed in a substantially circular shape. The right ends of the engagement plates 136b and 136c are engaged with the engagement groove 132g so as to sandwich the cylindrical portion 132d from above and below.

The travel speed change lever 137 operates the speed change rod 132 in the axial direction. The traveling speed change lever 137 is formed by bending a cylindrical member. One end (lower end) of the travel shift lever 137 is fixed to the rear side of the outer peripheral surface of the cylindrical portion 136a of the travel shift lever fulcrum member 136. The other end (upper end) side of the traveling speed change lever 137 is inserted into the guide hole 131 a of the traveling speed change lever guide 131. An operable position that can be reached from an operator located behind the machine body 2 during planting of a seedling by the walking type rice transplanter 1 using the operation unit 15 from the traveling shift lever 137 and the traveling shift lever fulcrum member 136 ( In this embodiment, it extends to the front of the seedling mount 61. A grip for an operator to grip is attached to the upper end portion of the traveling speed change lever 137. A locking portion that partially protrudes from the outer peripheral surface of the traveling speed change lever 137 is provided at a midway portion in the longitudinal direction of the traveling speed change lever 137 (frontward of the portion inserted through the guide hole 131a of the travel speed change lever guide 131). 137a is formed.
In addition, the shape and arrangement | positioning of the travel transmission lever 137 are not restricted to the thing of this embodiment, What is necessary is just a shape and arrangement | positioning which can be operated by the worker who is working.

As shown in FIG. 11, the washer 138 is inserted into the traveling speed change lever 137 and is engaged with the engaging portion 137 a of the traveling speed change lever 137 from the rear (upper side).
The spring 139 is a compression spring that is inserted into the traveling speed change lever 137. The spring 139 is arranged on the upper end side of the washer 138 in the traveling speed change lever 137.
The lever guide seat 140 is inserted into the travel speed change lever 137. The lever guide seat 140 is disposed on the upper end side of the travel speed change lever 137 with respect to the spring 139 and on the lower end side of the travel speed change lever guide 131.
The travel transmission lever guide 131 and the lever guide seat 140 are brought into contact with each other, and the travel transmission lever guide 131 is fixed in a state where the spring 139 is contracted by a predetermined length between the washer 138 and the lever guide seat 140. Accordingly, the lever guide seat 140 is pressed against the travel transmission lever guide 131 with a predetermined force by the urging force of the spring 139. The lever guide seat 140 is fitted into a guide groove (not shown) formed along the guide hole 131a of the travel speed lever guide 131. As a result, the traveling speed change lever 137 is guided to move along the guide hole 131 a of the traveling speed change lever guide 131.

  As shown in FIGS. 11 to 13, the instruction pin 141 indicates the position of the speed change rod 132 in the front-rear direction and the rotational position about the axis (the axis of the cylindrical portion 132 d). One end portion (right end portion) of the instruction pin 141 is fastened to the bolt 133 from the left side of the nut 134. The other end portion (left end portion) of the instruction pin 141 projects from the bolt 133 toward the left. The left end portion of the instruction pin 141 is formed thinner than the right end portion.

  The display member 142 regulates the operation range of the instruction pin 141 and indicates the position of the instruction pin 141. The display member 142 has a fixed portion and a guide portion, and is formed by bending a plate-like member into an L shape in a plan view. The fixing portion extends in the left-right direction, and is fixed to the center frame by an appropriate method on the front surface thereof (a surface substantially perpendicular to the axial direction of the speed change operation shaft 111). The guide portion extends rearward from the right end of the fixed portion so that the right side surface (a surface substantially parallel to the axial direction of the speed change operation shaft 111) faces the speed change rod 132. A guide hole 142a is formed in the guide portion so as to penetrate in the left-right direction. The left end portion of the instruction pin 141 is inserted through the guide hole 142a. The guide hole 142a is formed in a substantially rectangular shape in side view, and a plurality of recesses are formed around the guide hole 142a of the guide portion at predetermined intervals in the circumferential direction.

Below, the operation | movement aspect of the speed change operation mechanism 13 is demonstrated using FIG. 12 and FIG.
First, the case where the traveling speed change lever 137 is operated will be described.

When the operator operates the travel shift lever 137 in the left-right direction, the travel shift lever fulcrum member 136 fixed to the lower end of the travel shift lever 137 also rotates about the rotation fulcrum member 24a.
When the travel shift lever fulcrum member 136 is rotated, the right ends of the engagement plates 136b and 136c are moved in the front-rear direction, and the shift rod 132 engaged with the engagement plates 136b and 136c is also moved in the front-rear direction.
When the speed change rod 132 moves in the front-rear direction, the speed change operation shaft 111 connected to the speed change rod 132 is slid in the axial direction (front-rear direction).

  In this way, by operating the travel shift lever 137 in the left-right direction, the speed change operation shaft 111 can be slid in the front-rear direction. As a result, the walking type rice transplanter 1 travels and stops, and the travel direction (forward and It is possible to switch between the reverse travel) and the travel speed during forward travel (first forward speed and second forward speed).

  Next, a case where the inter-stock shift lever 135 is operated will be described.

When operating the inter-strain shift lever 135, the operator first moves to a position where the inter-strain shift lever 135 can be operated (on the left side of the walking rice transplanter 1 in this embodiment).
When the operator holds the upper part of the inter-stock shift lever 135 and rotates around the axis of the speed change rod 132, the speed change rod 132 fixed to the lower end of the inter-stock speed change lever 135 also rotates around the axis (axis of the cylindrical portion 132d). Move.
When the transmission rod 132 rotates about the axis, the transmission operation shaft 111 connected to the transmission rod 132 is rotated about the axis.

  In this way, by operating the inter-strain shift lever 135 generally in the vertical direction, it is possible to rotate the shift operation shaft 111 around the axis, and as a result, the interval between seedlings planted by the walking type rice transplanter 1 (between strains). Can be switched.

Further, the recess of the guide hole 142a of the display member 142 is formed at a position where the operator can recognize the position of the instruction pin 141. That is, as shown in FIG. 13, four concave portions are formed at predetermined intervals in the front-rear direction at the upper and lower portions of the guide hole 142a. The four concave portions are formed so as to correspond to the front-rear direction positions of the instruction pins 141 when shifting to the second forward speed, the first forward speed, the neutral, and the reverse speed. In addition, five concave portions are formed at predetermined intervals in the vertical direction at the front portion and the rear portion of the guide hole 142a, respectively. The five recesses are formed to correspond to the vertical position of the instruction pin 141 when the speed is changed to the first speed between stocks, the second speed between stocks, the neutral, the third speed between stocks, and the fourth speed between stocks. As a result, the operator can visually recognize which concave portion of the guide hole 142a the instruction pin 141 is inserted, and recognizes the current gear position of the walking type rice transplanter 1 from the visual result. be able to.
Moreover, in this embodiment, the recessed part formed in the position corresponding to neutrality is formed larger compared with another recessed part. Thereby, the operator can easily recognize the neutral position.

Note that the configuration of the speed change operation mechanism 13 is not limited to that of the present embodiment, and the speed change operation shaft 111 can be slid in the axial direction and rotated around the axis line by independent operation tools, and traveling The operation tool for changing the speed is arranged at an operable position that can be reached by the worker who is planting the seedling, and the operator for changing the strain is from the worker who is planting the seedling. Any arrangement may be used as long as it is not reachable and cannot be operated.
Moreover, the shape and arrangement | positioning of the instruction | indication pin 141 and the display member 142 are not restricted to the thing of this embodiment. In other words, the instruction pin 141 may be configured to move in conjunction with the speed change operation shaft 111, and the display member 142 may have any shape and arrangement that allows the operator to recognize the position of the instruction pin 141.

As described above, the walking-type rice transplanter 1 according to the present embodiment shifts the power transmitted from the planting device 5 for planting seedlings in the field, the engine 3, and the left wheel 4L, the right wheel 4R, and the planting device. And a transmission mechanism 7 that transmits to 5, and a gear ratio of the power that the transmission mechanism 7 transmits to the left wheel 4 </ b> L and the right wheel 4 </ b> R by sliding operation in the axial direction. And a shift operation shaft 111 that changes the speed ratio of the power transmitted to the planting device 5 by the transmission mechanism 7 by being rotated around the axis, and a position that can be operated by the worker who is working. A travel shift lever (first operation tool) 137 that is disposed and slidably operates the shift operation shaft 111 in the axial direction, and is disposed at a position that cannot be operated by an operator who is working, and the shift operation shaft 111 is rotated around the axis. Rotating operation between stocks It is intended to comprise a lever (second operating member) 135, a.
By comprising in this way, the change of traveling speed and the change between stocks can be performed easily and correctly, and workability | operativity can be improved.
That is, the operator can change the traveling speed only by operating the traveling speed change lever 137 in the left-right direction. Further, the worker can move between the left and right sides of the walking type rice transplanter 1 and change the stocks by simply operating the stock shift lever 135 in the vertical direction. In this way, the inter-strain shift lever 135 that is less frequently used in work on one field is disposed at an inoperable position that is not accessible from the worker who is working, and the travel shift lever 137 that is frequently used is disposed. Arranging at an operable position that can be reached from the worker who is working, the worker can operate the traveling speed change lever 137 without hesitation when changing the traveling speed during the work, and prevent erroneous operation. It is possible to improve the workability.
In addition, by changing the traveling speed and changing between the stocks with separate operating tools (traveling gear shift lever 137 and stock shifting lever 135), the operating method of each operating tool can be simplified, and workability is improved. It becomes possible. Furthermore, since the operation of each operating tool is independent, there is no need to change between stocks when changing the running speed, and there is no need to change the running speed when changing between stocks, so unnecessary shifting operations It is possible to suppress wear and deterioration of each component (for example, the transmission gear 75, the stock transmission gear 88, etc.).
In addition, by arranging the inter-stock shift lever 135 with a low operation frequency at a position where it cannot be operated by the worker who is working, it is possible to save the space of the worker (the range that can be operated from the worker who is working). Is possible.
Further, only one speed change operation shaft 111 is required to project from the transmission case 23 even though the travel speed and the change between stocks are changed by the two operating tools (the travel speed change lever 137 and the stock speed change lever 135). Therefore, it is possible to reduce the possibility that mud, dust or the like is caught in the sliding portion between the speed change operation shaft 111 and the transmission case 23, and to suppress the occurrence of oil leakage or the intrusion of mud or dust into the mission case. It is possible.

In addition, the walking type rice transplanter 1 is linked to the speed change operation shaft 111 and moves in the axial direction of the speed change operation shaft 111 or rotates around the axis. And a display member 142 for displaying a transmission gear ratio transmitted from the transmission mechanism 7 to the left wheel 4L and the right wheel 4R based on the position and a transmission gear ratio transmitted from the transmission mechanism 7 to the planting device 5. Is.
With this configuration, the position of the instruction pin 141 can be confirmed by the display member 142, and the gear ratio of the power transmitted to the left wheel 4L, the right wheel 4R, and the planting device 5 can be easily confirmed. Therefore, workability can be improved.

1 walking type rice transplanter 2 body 3 engine 4L left wheel (wheel)
4R Right wheel (wheel)
DESCRIPTION OF SYMBOLS 5 Planting apparatus 6 Seedling supply apparatus 7 Transmission mechanism 11 Transmission mechanism 13 Transmission operation mechanism 111 Transmission operation shaft 135 Stock change lever (second operation tool)
137 Traveling gear shift lever (first operation tool)
141 Indicating pin (indicating member)
142 Display member

Claims (2)

A planting device for planting seedlings in a field;
A transmission mechanism for shifting the power transmitted from the engine and transmitting the power to the wheels and the planting device;
A walking type rice transplanter comprising:
The transmission ratio of the power transmitted to the wheels by the transmission mechanism is changed by sliding operation in the axial direction, and the power transmitted by the transmission mechanism to the planting device by rotating around the axis. A speed change operation shaft for changing the speed ratio of
A first operating tool that is disposed at a position that can be reached by an operator during planting work and that slides the speed change operation shaft in the axial direction;
A second operating tool that is arranged at a position that is out of reach of an operator during planting work, and that rotates the shift operation shaft about an axis;
A walking type rice transplanter. In conjunction with the speed change operation shaft, an instruction member that moves in the axial direction of the speed change operation shaft or rotates around the axis,
A display member for displaying a speed ratio of power transmitted by the transmission mechanism to the wheel based on a position of the indicating member, and a speed ratio of power transmitted by the transmission mechanism to the planting device;
The walking type rice transplanter according to claim 1 comprising:

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