JP2933045B2 - Walking type farm work machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking agricultural machine having a four-wheel vehicle body. 2. Description of the Related Art As shown in Japanese Patent Application Laid-Open No. 57-65113, a conventional four-wheeled walking agriculture machine has a pair of left and right non-driven wheels and a pair of left and right driven wheels. the equipped, provided a handle on the rear of the fuselage, the walk-agricultural machine provided with NaeUe working portion on the ridge top performing NaeUe work between the left and right wheels, a sensor for grounding the ridge top surface - ridges upper surface position detection The actuator is actuated based on the operation and the sensor is operated.
The front and rear wheels move up and down to keep the distance between the ground contact surface and the aircraft constant, so that the work of the working unit on the upper surface of the ridge between the left and right wheels automatically operates to maintain a constant work depth The work could be performed satisfactorily. [0003] This conventional machine has a structure in which a pair of left and right driven wheels are provided on the front side of the body and a pair of left and right non-driven wheels are provided on the rear side of the body. [0004] The above-described walk-behind agricultural machine with a four-wheeled vehicle body has a problem that it is difficult to make a small turn because the four-wheels are in contact with the ground when turning on a headland or the like. In addition, when turning, a pair of left and right non-drive wheels on the rear side of the fuselage are lifted up and only a pair of left and right drive wheels on the front side of the fuselage are grounded. Since the vehicle turns, there is a problem that it is difficult to steer and the arm is easily fatigued. Conversely, even when the operator lowers the steering wheel to lift the pair of left and right drive wheels on the front side of the fuselage and turns only in the two-wheel contact state where only the pair of left and right non-drive wheels on the rear side of the fuselage touch the ground. You can make a small turn. In this case, there is an advantage that the steering wheel can be operated more easily than the case where the steering wheel is raised and turned as described above in that the steering wheel lowering operation can be performed with the weight of the operator placed thereon. However, since the driving wheels float and only the non-driving wheels touch the ground, there is no problem in that the propulsion of the aircraft during turning does not take place, and the pilot turns while pushing the aircraft, which requires labor. is there. When power is transmitted to the non-driven wheels that are grounded, the vehicle becomes a four-wheel-drive vehicle body structure, and there is a problem that the body structure becomes complicated or heavy. [0006] In order to solve the above-mentioned problems of the prior art, the present invention provides a pair of left and right non-driven wheels 15a, 15a on the front side of the body and a pair of right and left non-driven wheels. Are provided on the rear side of the fuselage, and a handle 25 is provided on the rear side of the axle position of the rear wheels 15, 15, and left and right wheels 15a, 15a, 15, 1 are provided.
In 5 provided a working unit for performing work ridge top surface between the walk-agricultural machine, <br/> the sensor actuator 18 is operated based on the ridge top surface position detecting operation of the sensor -23 grounding the ridge top surface A mechanism for moving the front and rear wheels 15a, 15a, 15, 15 up and down so as to make the distance between the ground surface of the -23 and the body constant, and a ridge upper surface position of the sensor 23 based on a manual operation of the operation tool 26. Before and after based on the detection action
The upward movement of the wheels 15a, 15a, 15,
The front and rear wheels 15a, 15
a walking mechanism comprising a mechanism for lowering the a, 15, 15; and a structure in which the rear wheels 15, 15 are turned around a turning fulcrum provided on the front side of the axle position to move up and down. Type farm working machine. [0007] The walking-type agricultural working machine of the present invention comprises:
A pair of left and right non-driven wheels 15a, 15a is provided on the front side of the body, and a pair of left and right driven wheels 15, 1 are rotated.
5 is provided on the rear side of the fuselage, so that the fuselage can be simpler and lighter than a four-wheel drive body. In addition, when working on the ridge upper surface, the vehicle runs across the ridge. In this case , the actuator is detected based on the ridge upper surface position detecting operation of the sensor 23 that is in contact with the ridge upper surface.
18 operates to keep the distance between the contact surface of the sensor 23 and the body constant, and the front and rear wheels 15a, 15a, 15, 1
Since the work 5 moves up and down, the work of the working section on the upper surface of the ridge automatically operates so as to maintain a constant work depth, so that the work can be performed satisfactorily. When turning at the field end, when the rear handle is lowered from the axle position of the rear wheel, the non-driven wheels on the front side of the fuselage rise and only the driven wheels on the rear side of the fuselage are grounded. It can be easily turned in a state where it is in contact with the ground and the propulsion of the aircraft is driven. By the way, when the sensor detects the position of the upper surface of the ridge and the wheels are automatically moved up and down as described above, the axle position of the rear wheels when turning at the edge of the field. Lowering the steering wheel on the rear side to raise the non-driven wheels on the front side of the fuselage makes it difficult to maneuver when turning around in a two-wheel grounded state where only the driven and rotated wheels on the rear side of the fuselage touch the ground. There's a problem. That is, when the ridge disappears at the end of the field, the contact surface of the sensor 23 shifts from the upper surface of the ridge to the ground without the ridge, and the aircraft descends to a height based on the ground. I will do it. In this manner, when the handle is lowered while the body is lowering and turning with two wheels in contact, the lowering operation amount of the handle increases,
In addition, since the aircraft is turned while holding the steering wheel at a considerably low position, the turning operation is very difficult. [0010] However, walk-agricultural machine of the invention, the distance between the ground plane and the fuselage of the sensor -23 to actuator 18 is operated based on the ridge top surface position detecting operation of the sensor -23 grounding the ridge top surface Front and rear wheels 15 to keep it constant
a, 15a, 15 and 15 are provided with a mechanism for moving the sensor 23 up and down.
Front and rear wheels 15a, 15 based on the ridge upper surface position detecting operation of
a, 15 and 15 to restrict the upward movement of the actuator 18
The front and rear wheels 15a, 15a, 15, 15
Since it has a mechanism for moving it down, the front and rear wheels 15a, 15a, 1
5 and 15 are automatically moved up and down, but at the time of turning , the sensor 23 is manually operated by the operation tool 26.
Suddenly when the ground contact surface moves from the top of the ridge to the ground without ridges
The front and rear wheels 15a, 15a, 15, 15 move up and
Actuating the actuator 18 by restricting the body from descending
Moves the front and rear wheels 15a, 15a, 15, 15 down
The aircraft can be lifted up, so it turns with two wheels in contact
Therefore, the amount of operation of lowering the handle when the handle is lowered can be reduced, and the height of the lowered handle does not become too low, so that the steering operation can be easily performed. [0011] In addition, the walking-type agricultural work machine of the present invention includes:
Since the rear wheels 15, 15 are configured to pivot around a pivot point provided on the front side of the axle position and move up and down, the aircraft is raised by manual operation of the operation tool 26 as described above during turning. As a result, the rear wheels 15, 15 are turned around a turning fulcrum provided on the front side from the axle position and descend, and the grounding position of the rear wheels 15, 15 is brought into contact with the body. It will move relatively forward. Therefore, the operation force when the steering wheel is lowered in opposition to the weight of the body part on the front side of the axle position of the rear wheels 15, 15 is reduced, and the turning operation is further facilitated. I have. An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2, a support 2 is provided at the rear of the transmission case 1 constituting the body of the seedling transplanter, and the width of the support 2 is formed to be approximately の of the width of the support 2. When the guide portion 3a is fitted into a guide rod 4 fixedly mounted on the support base 2 and the lead cam 5 supported by the support base 2 is turned, Lateral feed frame 3
The horizontal feed frame 3 moves laterally in the left and right direction (up and down direction in FIG. 2) in accordance with the engagement operation between the lead metal 6 and the lead cam 5. The box frame 7 whose front-rear length is formed to be about 1/2 of the front-rear direction (left-right direction in FIG. 2) of the lateral feed frame 3 and whose upper and lower surfaces are open, is Along the right and left sides 3b and 3c of the feed frame 3, it is possible to move forward and backward while riding on the rollers 8. This forward and backward movement is performed by the actuator 9a of the electromagnetic solenoid 9 attached to one of the left and right sides 3c. The engagement piece 10 is attached so as to be freely rotatable only in the vertical direction, and the engagement piece 10 is engaged with a saw blade rack 11 fixed to one of the left and right sides of the box frame 7 as illustrated in FIG. Support stand 2
Detectors SL and SR such as microswitches are attached to the left and right side plates 2a and 2b, respectively, at positions near the end of lateral movement to the left as shown in FIG. 2 or near the end of lateral movement to the right (not shown). Left and right sides 3b of the traversing frame 3 that have reached the positions
Alternatively, if the respective actuators of the detectors SL and SR are pushed by 3c and their normally open contacts are closed, the electromagnetic solenoid 9 is excited after a certain time, and for example, the actuator 9a becomes
To move the box frame 7 in the same direction as one of the saw blade racks 11.
It will be moved backward by the pitch. The box frame 7 has grid-like partitions 12a.
Since the seedling box 12 having the inside is substantially fitted closely, the rearward movement for one pitch is equal to the length of one section in the front-rear direction of the partition 12a. A drop hole 2d provided in the bottom plate 2c in the vicinity (this is a partition 1
2a), each partition 12a of the seedling box 12 looks one after another, and the actuators of the detectors SL and SR are pushed. When the actuator 9a is not moved, the electromagnetic solenoid 9 is deenergized, so that when the operator 9a returns in the direction of the arrow A by the return spring 14, the saw blade rack 11 is slid back to the engagement piece 10. The left and right drive cases 16, 16 which support the wheels 15, 15 at the rear thereof are vertically rotated about the traveling drive shafts 17, 17 which are supported at the left and right of the transmission case 1. It pivots freely. On the other hand, an elevating cylinder 18 having one end attached to the fuselage is provided substantially horizontally at a substantially central portion in the traveling direction of the fuselage.
At the center of a balancing rod 19 at the rear end of the piston 18a, and at the left and right ends of the balancing rod 19, the rear ends of rods 21 and 21 extending forward, respectively. At the same time, the front ends of the rods 21 and 21
It is pivotally supported on the upper ends of substantially rectangular arms 20, 20 fixed to the upper ends of 6,6. The elevating cylinder 18 is configured to be operated by a supply / discharge operation of pressure oil from a pump (not shown) by a switching operation of a switching valve 24 having a valve body pivotally attached to the body. And a sensor 23 having an upper end pivotally connected to the body so that the tip of the spool 24a of the switching valve 24 and the planting surface of the ridge 22 can slide up and down. The spool 24a
Makes the switching valve 24 move in and out, and the elevating cylinder 18
Is configured to be able to supply and discharge pressure oil from a pump (not shown). On the other hand, the lifting operation lever 26 provided on one of the left and right handles 25, 25 and the spool 24a are connected by an operation wire 27, and the lifting operation lever 26 is manually operated. The spool 24 a is configured so as to move in and out of the switching valve 24 so that the pressure oil can be supplied to and discharged from the lifting cylinder 18 by the switching operation of the switching valve 24. Thus, if the elevating operation lever 26 is manually operated, the spool 24a moves in and out as described above, and pressure oil is supplied to the elevating cylinder 18 so that the piston 18a protrudes. The arms 20, 20 fixed to the upper end portions of the drive cases 16, 16 are rotated based on the projecting operation of the drive cases 16, 16 and the lower portions of the drive cases 16, 16 are rotated downward, whereby the wheels 15, 15 are rotated. Moves downward. As a result, the aircraft is relatively elevated. Also, the spool 24a moves in the opposite direction, whereby the pressurized oil is discharged from the elevating cylinder 18 and the drive cases 16, 16 are rotated upward by their own weight, whereby the body is relatively lowered. Becomes Then, by operating the operation lever 26, the distance between the seedling transplant surface and the machine body is adjusted to be constant in advance. At this time, this operation lever 2
6, the sensor 23 is allowed to rotate to a predetermined position. When the raising or lowering operation of the seedling transplanter is performed and the operation wire 27 is in a substantially tensioned state without loosening, the spool 24a Returns to the neutral position, the supply or discharge of the pressure oil stops, and the seedling transplanter is maintained at the current height. Therefore, this seedling transfer
The planting machine detects the position of the ridge top surface of the sensor 23 that touches the ridge top surface.
The actuator 18 is actuated based on the
-23
A mechanism for moving the wheels 15a, 15a, 15, 15 up and down
And a sensor based on manual operation of the operating tool 26.
Front and rear wheels 15a,
Actuator for regulating upward movement of 15a, 15, 15
18, the front and rear wheels 15a, 15a, 15, 1
5 is provided with a mechanism for lowering it. Thus, when the seedling is transplanted, the spool 24a is moved based on the vertical movement of the sensor 23.
Performs the operation of entering and leaving the switching valve 24. If the transplanting surface of the seedling has irregularities and the distance between the transplanting surface of the seedling and the machine body changes, the sensor 23 is moved up and down. Based on the operation, the supply and discharge of the pressure oil from the elevating cylinder 18 are performed, whereby the wheels 15, 15 move upward or downward as described above, and the body relatively descends or ascends. Thus, the distance between the transplanting surface of the seedlings and the machine is always kept constant. In addition, a pair of passive wheels 15a, 15a is provided in front of the pair of wheels 15, 15, and the passive wheels 15a, 15a have mounting rods 15 whose upper ends are pivotally supported by the body.
The passive wheels 15a, 1b are attached to lower ends of the passive wheels 15a, 1b by connecting the attachment rods 15b, 15b and substantially centers of the arms 20, 20 by connecting rods 15c, 15c.
5a is configured to move up and down to the same height following the raising and lowering operations of the wheels 15,15. Thus,
Based on the detection operation of the sensor 23, the wheels 15, 15 and the passive wheels 15a, 15a are moved up and down to relatively lower or raise the body, and the distance between the seedling transplant surface and the body is automatically and appropriately adjusted. So that it can be maintained. Further, the pair of wheels 15, 15 are driving wheels as described above, and are provided on the rear side of the fuselage. The pair of passive wheels 15a, 15a are non-driving wheels as described above. In addition, a pair of right and left is provided on the front side of the fuselage. Moreover, as shown in the drawing, the engine 56 is provided on the front side of the axle position of the drive wheels 15, 15, and
The handle 25 is provided on the rear side of the axle position of the drive wheels 15, 15, and the pair of left and right drive wheels 15, 15 is rotated about a rotation fulcrum provided on the front side of the axles of the drive wheels 15, 15. It is configured to be able to move up and down. Therefore, when turning, the drive wheels 1 on the rear side of the fuselage
5 and 15, the handle 25 is lowered, and a pair of left and right non-drive wheels 15a, 15a on the front side of the fuselage.
Can be turned as a two-wheel grounding state in which only a pair of left and right drive wheels 15, 15 on the rear side of the fuselage are in contact with the ground. The drive wheels 15, 15 are rotated and lowered about the rotation fulcrum provided on the front side. Therefore, the drive wheels 15, 15 on the rear side of the body are lowered, and the ground contact position of the wheels is lowered with respect to the body. It will move forward. A seedling pushing-out device 29 is provided on a holder 28 extending from one handle 25. The seedling pushing device 29 is fixed to the holder 28 and the operating rod 31 is moved up and down to the bearing tube 30. A seedling pushing rod 32 which is movably fitted and has a pushing head 32a at the lower end is fitted to the receiving cylinder 31a of the operating rod 31 so as to freely rotate only around its axis. When the portion 32a is located above the drop hole 21d and is near the pushing position as shown in FIG. 6, the leaf stem 13b of the soild seedling 13 has the pushing head 32a and the receiving cylinder 31a.
Is formed in a detour shape such that the base 32b near the center portion 32c and the intermediate portion 32c formed between the pushing head 32a do not come into contact with each other. Then, stoppers 34 and 35 are protruded from a receiving plate 33 fixed to the lower end of the bearing cylinder 30, and are attached to the upper part 32 d of the seedling pushing rod 32 rotatably fitted to the receiving plate 33. , The operation plate 36 is rotatably fitted, a spring 38 is stretched between a pin 37 provided at a rotation end portion of the operation plate 36 and the bearing tube 30, and the seedling is placed above the receiving tube 31 a. Base 32 of push rod 32
d, an operating arm 39 is fixed to the operating arm 39, and the operating plate 36 is sandwiched from the left and right by pins 40, 40 fixed to the operating arm 39 so that the operating arm 39 can rotate integrally with the operating plate 36. Has become. As shown in FIG. 9, when the spring 38 is on one side of the base 32d, the operating plate 36 is held at a position where it comes into contact with the stopper 35. In this state, the operating portion of the operating plate 36 or the operating arm 39 is held. If the pusher 39a is pushed clockwise, the pusher rod 32 rotates clockwise together with the operating plate 36 and the operating arm 39, and the spring 38 moves beyond the base 32d to the other side. The operation plate 36, the operation arm 39,
Both the seedling pushing rods 32 are rotated by about 90 degrees from the position shown in FIG. 9, and the operating plate 36 is held in contact with the stopper 34. Then, as shown in FIG. 3, operating bodies 41 and 42 are fixed to the left and right side portions 3b and 3c of the horizontal feed frame 3, respectively, and the seedling box 12 (which is shown in FIG. A drop hole 21d and a seedling pushing rod 32 are located at the lower right corner of the box frame 7 that stores the omission (not shown), and the transverse feed frame 3 is moved in the direction of the arrow B by the rotation of the lead cam 5 to the partition 13a. The extruding crank 57 swings and pivots by a drive mechanism described below, and the seedling extruding rod 32 moves as shown in FIG. The extruding head 32 is positioned between a standby position immediately above the soil portion 13a and a punching position (not shown).
7a to move up and down to push out the soild seedlings 13 and in this standby position, as shown in a plan view in FIG. As shown in FIG. 9, the operating plate 36 contacts the stopper 35 so as to be located forward in the lateral movement direction of the arrow B, and
2a is held in the shape of FIG.
a, the pushing head 32a always moves in the direction of the arrow B in a state of approaching the upper surface of the soil portion 13a with respect to the leaf stem portion 13b in the stored state.
That is, the seedling box 12 can be approached from the lateral movement front. When the pushing head 32a reaches the partition 12a at the end of the lateral movement in the direction of the arrow B as shown in FIG. 7, the operating body 41 engages with the operating portion 39a as shown in FIG. In order to rotate the operating arm 39 clockwise, the pushing head 32a also turns about 90 degrees around the leaf stem 13b, and after this turning, the seedling pushing rod 32 moves to the position shown in FIG. Is held, the extruding head 32a is changed to the L-shape in plan view, and after the seedling pushing operation by the seedling pushing rod 32 is completed, the electromagnetic solenoid 9 linked to the operation of the detector SL is turned on. The excitation operation and the accompanying movement of the box frame 7 in the direction of the arrow A are performed, and the extrusion head 32a looks at the partition 12a of the next row of the seedling box 12 while keeping the L shape as shown in FIG. become. The rotation of the lead cam 5 causes the lateral feed frame 3 to move laterally in the direction of the arrow B,
Also at this time, the pushing head 32a approaches from the front of the seedling box 12 in the lateral movement. As shown in FIG. 3, when the lateral feed frame 3 (ie, the seedling box 12) reaches the end of the lateral movement in the direction of the arrow B and the extrusion head 32a faces directly above the partition 12a at the same end. Since the operating body 42 engages with the operating plate 36 as shown in FIG. 10 and rotates the operating plate 36 counterclockwise in FIG. 10, the pushing head 32a also makes the rotation of the leaf stem 13b approximately 90 degrees. The seedling pushing rod 32 is rotated to hold the seedling pushing rod 32 at the position shown in FIG. 9, the pushing head 32a returns to the shape shown in FIG. 6, and the seedling pushing operation by the seedling pushing rod 32 is performed. SL
The box frame 7 is moved in the direction of the arrow A by the electromagnetic solenoid 9 in conjunction with the operation of, so that the extrusion head 32a looks at the partition 12a of the next row in the shape of FIG. The feed frame 3 starts horizontal movement in the direction of arrow B. As shown in FIG. 11, the pushing head 43a of the seedling pushing rod 43 may have an oblique rod shape.
The extrusion head 44a may have a triangular shape as shown in FIG. 3, and if it can be rotated about 90 degrees around the leaves 13b without contacting it, the position can be changed. good. Therefore, as shown in FIG.
Although it may be a, when the leaf stem portion 13b is surrounded from three sides in this way, after reaching the end of the lateral movement, the seedling pushing rod 45 in the posture is used to push the seedling. The horizontal feed frame 3 is further fed in the same direction by at least one section of the partition 12a in the same direction, and the 90 ° rotation of the seedling pushing rod 45 is performed in conjunction with this operation. Then, after changing the position in the shape of a letter as shown in FIG.
It is necessary to change the lateral movement so that the lateral movement is started in the direction of the arrow B as shown in FIG. In the illustrated seedling transplanter, the soiled seedling 13 that has been pushed out by the seedling pushing rod 32 and falls from the drop-out hole 21d is guided by a guide cylinder 46 to a planting mechanism 47 thereunder.
Of the planting claw 49, 4
9, the seedling 13 is held, and the base of the seedling 13 is connected to the mission case 1 by a parallel link 50 pivotally supported.
When the parallel link 50 is moved downward by rotation of the crank 51 to reach the planting position where the planting claws 49, 49 are inserted into the ridge 22, the release rod 52 collides with the release pin 53. Therefore, the release rod 52 is supported by the fulcrum pin 5
By pivoting upward around the center 4, the planting claws 49, 49 open around the pins 55, 55, and the planting claws 49, 49 excavate a planting hole in the ridge 22 by this opening operation. ,
The seedlings 13 with soil are released from the planting claws 49, 49 into the planting holes, and the soil portion 13a is covered with a soil covering device (not shown). The crank 51 is driven through a transmission mechanism driven by an engine 56, and drives a pushing crank 57 of the seedling pushing rod 32 through a bell crank mechanism 58. Needless to say, the planting mechanism may be of various types, such as a structure that excavates the above-mentioned ones, and that releases the soiled seedlings 13 from the seedling receiving portion to the planting holes. A structure in which the seedling 13 is dropped directly from the drop hole 21d to the planting hole of the ridge 22 without using the same may be used. Therefore, the seedling transplanter has a pair of left and right non-driven wheels 15a, 15a on the front side of the body and a pair of left and right driven wheels 15, 15 on the rear side of the body. Since the vehicle body configuration is used, the body can be configured more simply and lighter than a four-wheel drive vehicle body configuration.
Moreover, when working on the ridge upper surface, the vehicle runs across the ridge. In this case , the actuator 18 operates based on the ridge upper surface position detecting operation of the sensor 23 that is in contact with the ridge upper surface , and the sensor 23 contacts the ground surface. The front and rear wheels 15a, 15a, 15, 15 move up and down so as to keep the distance between the vehicle and the body constant, so that the work of the work section on the upper surface of the ridge automatically operates so as to maintain a certain work depth. As a result, work can be performed well. When turning at the field end, when the rear handle is lowered from the axle position of the rear wheel, the non-driven wheels on the front side of the fuselage rise and only the driven wheels on the rear side of the fuselage are grounded. It can be easily turned in a state where it is in contact with the ground and the propulsion of the aircraft is driven. By the way, the sensor as described above - automatically and <br/> the wheel is a configuration that moves up and down, when turning in the field end, the axle position of the wheel after the side detects the ridges top position Lowering the steering wheel on the rear side to raise the non-driven wheels on the front side of the fuselage makes it difficult to maneuver when turning around in a two-wheel grounded state where only the driven and rotated wheels on the rear side of the fuselage touch the ground. There's a problem. That is, when the ridge disappears at the end of the field, the contact surface of the sensor 23 shifts from the upper surface of the ridge to the ground without the ridge, so that the aircraft descends to the height with respect to the ground. I will do it. In this manner, when the handle is lowered while the body is lowering and turning with two wheels in contact, the lowering operation amount of the handle increases,
In addition, since the aircraft is turned while holding the steering wheel at a considerably low position, the turning operation is very difficult. [0035] However, walk-agricultural machine of the invention, the distance between the ground plane and the fuselage of the sensor -23 to actuator 18 is operated based on the ridge top surface position detecting operation of the sensor -23 grounding the ridge top surface Front and rear wheels 15 to keep it constant
a, 15a, 15 and 15 are provided with a mechanism for moving the sensor 23 up and down.
Front and rear wheels 15a, 15 based on the ridge upper surface position detecting operation of
a, 15 and 15 to restrict the upward movement of the actuator 18
The front and rear wheels 15a, 15a, 15, 15
Since it has a mechanism for moving it down, the front and rear wheels 15a, 15a, 1
5 and 15 automatically move up and down, but at the time of turning , the sensor 23 is manually operated by the operation tool 26.
Suddenly when the ground contact surface moves from the top of the ridge to the ground without ridges
The front and rear wheels 15a, 15a, 15, 15 move up and
Actuating the actuator 18 by restricting the body from descending
Moves the front and rear wheels 15a, 15a, 15, 15 down
The aircraft can be lifted up, so it turns with two wheels in contact
Therefore, the amount of operation of lowering the handle when the handle is lowered can be reduced, and the height of the lowered handle does not become too low, so that the steering operation can be easily performed. In addition, the walking type agricultural working machine of the present invention
Since the rear wheels 15, 15 are configured to rotate around a rotation fulcrum provided on the front side of the axle position and move up and down, the aircraft is raised by manual operation of the operation tool 26 during turning as described above. When this is done, the rear wheels 15, 15 are turned around the turning fulcrum provided on the front side of the axle position and descend, and the grounding position of the rear wheels 15, 15 with respect to the body. It will move relatively forward. Therefore, the operating force when the steering wheel is lowered in opposition to the weight of the body part on the front side of the axle position of the rear wheels 15, 15 is reduced, and the turning operation is further facilitated. I have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a seedling transplanter according to one embodiment of the present invention. FIG. 2 is a plan view of a main part. FIG. 3 is a perspective view of a seedling box feeding device. FIG. 4 is a view taken along the line AA in FIG. 2; FIG. 5 is a view taken in the direction of arrow B in FIG. 2; FIG. 6 is a side view of the seedling pushing device. FIG. 7 is an essential part plan view of a seedling box showing a pushing procedure in the embodiment of the seedling pushing rod. FIG. 8 is a perspective view of a seedling pushing device. FIG. 9 is a plan view of the seedling pushing device showing a rotation position of a seedling pushing head. FIG. 10 is a plan view of the seedling pushing device showing a rotation position of a seedling pushing head. FIG. 11 is a plan view of a main part of a seedling box showing a pushing procedure in the embodiment of the seedling pushing rod. FIG. 12 is an essential part plan view of a seedling box showing a pushing procedure in the embodiment of the seedling pushing rod. FIG. 13 is an essential part plan view of a seedling box showing a pushing procedure in the embodiment of the seedling pushing rod. [Description of Signs] 15, 15: Drive wheels 15a, 15a: Non-drive wheels 25: Handle 56: Engine

Claims (1)

(57) [Claims] A pair of left and right non-driven wheels 15a, 15a is provided on the front side of the fuselage and a pair of left and right driven and rotated wheels 1 is provided.
5 and 15 are provided on the rear side of the fuselage, and the handle 25 is provided on the rear side of the axle position of the rear wheels 15 and 15.
5a, 15a, the walk-agricultural machine provided with a working unit for performing work ridge top between 15 and 15, activator based on ridge top position detecting operation of the sensor -23 grounding the ridge top surface
The front and rear wheels 15a, 15a, 15a, 15a
A mechanism for vertically moving the ridges 15 and 15 is provided.
Front and rear wheels 15a, 15a, 15, 1 based on the detection operation
5 by controlling the ascending movement of
The front and rear wheels 15a, 15a, 15, 15 are moved downward.
A walking type agricultural working machine comprising a mechanism , wherein the rear wheels 15, 15 are configured to rotate around a rotation fulcrum provided on the front side of the axle position and move up and down.