JP2014138559A - Walking type rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability and safety, improve traveling performance and planting performance, and reduce the cost in a walking type rice transplanter.SOLUTION: The walking type rice transplanter includes: left/right wheels; respective left/right traveling transmission cases supporting the wheels at a rear end and turning vertically; respective left/right arms turning integrally with the traveling transmission cases; a relay link member (18) that moves in the cross direction by following the cross-directional movement of a cylinder rod (17) of a lifting/lowering cylinder (16); and respective left/right connection rods (20) for connecting both left/right ends of the relay link member (18) and the arms. The relay link member (18) turns about a vertical fulcrum shaft (19) disposed between the left/right connection rods (20), and an elastic member (80) is provided separately from the relay link member (18), for connecting the left/right connection rods (20).

Description

  The present invention belongs to the technical field of walking type rice transplanters.

  Left and right wheels, left and right traveling transmission cases that support the wheels at the rear end and rotate in the vertical direction, left and right arms that rotate integrally with the traveling transmission case, and cylinder rods of the lifting cylinder A relay link member that moves back and forth following the movement in the front-rear direction, and left and right connecting rods that connect the left and right ends of the relay link member and the arm. It is configured to be able to rotate around the fulcrum shaft in the vertical direction arranged in between, and the left and right connecting rods are connected to the relay link member via a spring, following the change in the load sharing of the left and right wheels due to the left and right inclination of the aircraft There is a walking type rice transplanter configured to change the effective length of the left and right connecting rods by expanding and contracting the spring.

  In addition, this walking type rice transplanter transmits power from the prime mover into the main transmission case, transmits from the main transmission case to the left and right wheels via the left and right traveling transmission cases, and then transplants from within the main transmission case. The seedlings on the seedling stage are transmitted to the planting transmission case via the attached transmission shaft, transmitted from the planting transmission case to the plurality of seedling planting devices and the seedling stage, and moving the seedling stage left and right. The seedling planting device is configured to scrape one stock at a time and plant it in the field.

  In addition, this walking type rice transplanter has a prime mover and a main transmission case arranged in front of the axles of the left and right wheels, and a planting part including a planting transmission case, a plurality of seedling planting devices and a seedling mounting stand. A spare seedling stage that is arranged on the rear side of the axles of the left and right wheels and moves in the front-rear direction with respect to the airframe is arranged above the axles of the left and right wheels in a side view.

  Further, in this walking type rice transplanter, the seedling platform is configured to move left and right along the seedling receiving plate and supply seedlings one by one to the seedling inlet of each strip provided on the seedling receiving plate. The planting device is configured to scrape the seedling on the seedling outlet and plant it in the field, and to provide line drawing markers on both the left and right sides of the planting part to draw a line at the field position as an indicator of the next stroke travel, A seedling plate protection frame is provided to protect the seedling. The line drawing marker is configured to draw a line on the farm field with the tip portion in contact with the farm scene by switching from the standing posture to the lying posture lying on the side.

  In addition, this walking type rice transplanter supports a plurality of floats that are in contact with the farm scene so as to be pivotable up and down around the respective pivotal fulcrum shafts in the left and right directions, and each provided with a pivotal fulcrum shaft at the tip. The planting depth adjusting arm is fixed to the planting depth adjusting shaft and rotated up and down integrally with the planting depth adjusting shaft around the planting depth adjusting shaft. A planting depth adjusting lever for rotating the height adjusting shaft is provided (see Patent Document 1).

  On the other hand, left and right wheels, left and right traveling transmission cases that support the wheels on the rear end and rotate in the vertical direction, left and right arms that rotate integrally with the traveling transmission case, A relay link member that moves back and forth following the movement of the cylinder rod in the front-rear direction, and left and right connecting rods that connect the left and right ends of the relay link member and the arm are provided. There is a walking type rice transplanter that is configured to be rotatable about a vertical fulcrum shaft disposed between rods, and provided with an elastic member that is a torsion bar that connects the left and right traveling transmission cases separately from the relay link member. The elastic member is disposed below the main frame of the airframe.

  This walking type rice transplanter has a center float for leveling the planting positions of the two left and right inner seedling planting devices disposed between the left and right wheels, and left and right outer wheels disposed on the left and right outer sides of the left and right wheels. Side floats that level the planting position of each one seedling planting device are provided, and the left and right widths of the side floats are smaller than the left and right widths of the center float. (See Patent Document 2).

  And in the walking type rice transplanter, it is configured to transmit to a plurality of seedling planting devices through a plurality of planting transmission members from a transmission shaft extending in the left-right direction provided in the planting transmission case, and for a plurality of planting It transmits to the seedling planting device of 2 right and left center through the transmission member of the center of right and left among the transmission members, and via the transmission member of the left and right outermost of the plurality of transmission members for planting To the left and right outermost one seedling planting device, and to transmit from the transmission shaft to the left and right moving mechanism for moving the seedling platform left and right via the left and right moving transmission member, There is a configuration in which a plurality of safety clutches are provided on the lower side of the transmission than the planting transmission member and corresponding to a plurality of planting transmission members.

  In the walking type rice transplanter, in each of the left and right traveling transmission cases, a traveling output shaft and an axle projecting laterally from the main transmission case are inserted, and a main drive sprocket that rotates integrally with the traveling output shaft is provided. A counter driven sprocket and a counter driven sprocket that rotate integrally with each other on the counter shaft in the traveling transmission case, and the first transmission between the main driven sprocket and the counter driven sprocket. There is a configuration in which a chain is wound, a second transmission chain is wound between the counter drive sprocket and the main driven sprocket, and the transmission is decelerated in two stages in the traveling transmission case.

  Moreover, in the walking type rice transplanter, there is a configuration in which a steering handle provided at a rear end portion of the aircraft is provided so as to be able to be turned up and down, and the height of the steering handle can be changed according to the height of the operator.

JP 2008-253231-A JP 2006-238790 A

  An object of the present invention is to improve operability and safety, improve running performance and planting performance, and reduce costs in a walking type rice transplanter.

In order to solve the above problems, the following technical measures were taken.
That is, the invention according to claim 1 includes left and right wheels (5), left and right traveling transmission cases (4) that support the wheels (5) at their rear ends and rotate in the vertical direction, and the traveling The relay link member (18) that moves back and forth following the movement in the front-rear direction of the left and right arms (21) that rotate integrally with the transmission case (4) and the cylinder rod (17) of the lift cylinder (16). And left and right connecting rods (20) for connecting the left and right ends of the relay link member (18) and the arm (21). The relay link member (18) is between the left and right connecting rods (20). A walking-type rice transplanter that is configured to be rotatable about a fulcrum shaft (19) in the vertical direction and is provided with an elastic member (80) that connects the left and right connecting rods (20) separately from the relay link member (18). It was a machine.

The invention according to claim 2 is the walking type rice transplanter according to claim 1, wherein the elastic member (80) is arranged above the elevating cylinder (16) or the cylinder rod (17).
In the invention according to claim 3, the left and right connecting rods (20) are each provided with a restricting member (26), and the lifting cylinder (16) is operated to lower the left and right wheels (5). The left and right restricting members (26) come into contact with the frame (25) of the fuselage to restrict the left and right wheels (5) from moving up and down in a reciprocal manner. The restricting members are based on the frame (25). (26) It was set as the walk type rice transplanter of Claim 1 or Claim 2 which has arrange | positioned the elastic member (80) on the opposite side in the front-back direction.

  The invention according to claim 4 is provided with a center float (12a) disposed between the left and right wheels (5) and a side float (12b) disposed on the left and right outer sides of the left and right wheels (5). The left and right width of the side float (12b) is smaller than the left and right width of the center float (12a), and the traveling transmission case (4) is moved to the counter shaft (71) in the left and right direction by the first transmission chain (73). The first transmission that houses the first transmission chain (73) is configured to transmit and transmit from the counter shaft (71) via the second transmission chain (104) to the axle (14) of the wheel (5). A chain housing portion (75), a counter shaft housing portion (76) for housing the counter shaft (71), and a second transmission chain housing portion (77) for housing the second transmission chain (104), One transmission The second transmission chain (104) and the second transmission chain housing portion (77) are positioned on the outer side in the left-right direction with reference to the shaft (73) and the first transmission chain housing portion (75). The walking type rice transplanter according to any one of claims 1 to 3, wherein wheels (5) are arranged on the outer side in the left-right direction of (104) and the second transmission chain housing portion (77).

  Further, in the invention according to claim 5, the center float (12a) sets the planting position of the two seedling planting devices (10) on the left and right inner sides, and the side float (12b) has one on each of the left and right outer sides. It was set as the structure which leveled the planting position of the seedling planting apparatus (10), and it was set as the walk type rice transplanter of Claim 4 which has arrange | positioned the rake | shake (78) which leveles a farm field behind a wheel (5).

  Further, the invention according to claim 6 is provided with left and right side clutches (61) for turning on and off the transmission to the left and right wheels (5), and the side clutch (61) is an input that rotates about a rotation axis. The side member (63), the ball (65) entering the groove (64) provided in the input side member (63), and the input side member (63) rotating with the ball (65) entering the groove (64) An output side member (66) that is transmitted through the ball (65) and rotates about the rotation axis, and moves the output side member (66) in a direction along the rotation axis. The transmission between the ball (65) and the input side member (63) or the output side member (66) is cut off, and the ball (65) is rotated every 60 degrees of rotation phase angle centered on the rotation axis. The arrangement according to any one of claims 1 to 5, wherein six are arranged. It was a walking type rice planting machine.

  Further, the invention according to claim 7 urges the rotation about the fulcrum shaft (19) of the relay link member (18) between the cylinder rod (17) and the relay link member (18). The walking type rice transplanter according to any one of claims 1 to 6, wherein a first urging device is provided.

  In the invention according to claim 8, the left and right connecting rods (20) are configured to be extendable / contractible by the respective extension / contraction portions, and the extension / contraction portions are provided with a second urging device for urging extension / contraction, The biasing force for biasing the connecting rod (20) by the second biasing device is smaller than the biasing force for biasing the connecting rod (20) by the biasing device. The walking type rice transplanter.

  The invention according to claim 9 is the invention according to any one of claims 1 to 8, wherein a support tool (86) for supporting the left and right intermediate portions of the elastic member (80) so as not to move back and forth is provided. The walking type rice transplanter.

  According to the first aspect of the present invention, the relay link member (18) rotates around the fulcrum shaft (19) in the vertical direction following the left-right inclination of the cultivating field and the unevenness of the cultivating field. The wheels (5) move up and down in opposition to maintain the left and right tilting posture of the aircraft in a desired posture. In addition, the elastic member (80) provides resistance to opposite vertical movements of the left and right wheels (5), prevents the aircraft from abruptly tilting left and right, stabilizes the attitude of the aircraft, and improves operability and safety. Improvement can be achieved and driving performance and planting performance can be improved. Moreover, the elastic member (80) is attached to the left and right connecting rods (20) that move back and forth as the left and right wheels (5) move up and down, and moves back and forth as the wheels (5) move up and down. In addition, the vertical width of the moving space of the elastic member (80) can be reduced, and thus the center of gravity of the aircraft can be lowered, operability and safety can be improved, and traveling performance and planting performance can be improved. .

  According to the invention according to claim 2, in addition to the effect of the invention according to claim 1, the elastic member (80) can be arranged as high as possible, mud in the field adheres and the function of the elastic member (80) decreases. Or the elastic member (80) can interfere with the float leveling the field and the leveling can be prevented.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, when the aircraft is traveling on the road or when the aircraft is loaded on a truck, the left and right wheels (5) are lowered. If the airframe is raised, the vertical movement of the left and right wheels (5) is restricted by the restricting member (26), so that the attitude of the airframe can be stabilized and the operability and safety are improved. Since the elastic member (80) is disposed on the opposite side of the restricting member (26) in the front-rear direction with respect to the frame (25), the restricting member (26) and the elastic member (80) are arranged in the front and rear of the frame (25). The aircraft can be made compact.

  According to the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, stepwise by the first transmission chain (73) and the second transmission chain (104). Therefore, the rotational speed of the wheel (5) can be set as desired. Furthermore, since the first transmission chain housing portion (75) is located on the inner side in the left-right direction with respect to the second transmission chain housing portion (77), the traveling transmission case (4) as a whole is based on the wheels (5) as much as possible. It can be placed inside the aircraft in the left-right direction, can suppress mud pushing to the left and right outside generated by the traveling transmission case (4), and prevents mud pushing to the left and right outside of the aircraft even with side floats (12b) with small left and right widths And planting performance can be improved.

  According to the invention according to claim 5, in addition to the effect of the invention according to claim 4, the left and right widths in which the side floats (12b) level the planting position of the one seedling planting device (10) on each of the left and right outer sides. Even with a small configuration, it is possible to satisfactorily level the vicinity of the planting position with the rake (78) and improve the planting performance.

  According to the invention of claim 6, in addition to the effect of the invention of any one of claims 1 to 5, the vehicle body can be turned with the side clutch (61) inside the turn turned off. Further, the movement resistance that moves the output side member (66) in the direction along the rotational axis can be reduced by a large number (six) of the balls (65) arranged at every rotation phase angle of 60 degrees. 61), the operability is improved, and the side clutch (61) can be immediately disengaged to make a proper small turn.

  According to the invention of claim 7, in addition to the effect of the invention of any one of claims 1 to 6, the first urging device causes the relay link member (18) to be moved to the left and right wheels (5). ) Is suppressed toward the side that suppresses the height difference, so that the aircraft can be prevented from tilting greatly from side to side, operability and safety can be improved, and traveling performance and planting performance can be improved.

  According to the invention according to claim 8, in addition to the effect of the invention according to claim 7, the left and right wheels (5) can be independently moved up and down in correspondence with the local unevenness of the field. It is possible to prevent the aircraft from tilting left and right due to local unevenness, improve the stability of the aircraft, improve operability and safety, and improve running performance and planting performance.

  According to the invention according to claim 9, in addition to the effect of the invention according to any one of claims 1 to 8, it is possible to further suppress the opposing vertical movement of the left and right wheels (5), and the fuselage It is possible to prevent the vehicle from inclining right and left rapidly, stabilize the attitude of the aircraft, improve operability and safety, and improve traveling performance and planting performance.

Side view showing walking rice transplanter Top view showing walking rice transplanter Sectional view showing the side clutch The top view which shows a relay link member, a connecting rod, and its peripheral member Cross-sectional side view showing relay link member, connecting rod and its peripheral members The perspective view which shows a relay link member, a connecting rod, and its peripheral member intelligibly Side view showing main frame and planting transmission case Cross-sectional plan view showing planting transmission case Perspective view showing planting depth adjustment mechanism Partially cut plan view showing a configuration provided with a rolling restraining leaf spring The perspective view which shows the elastic member comprised with the round shaft The perspective view which shows a pendulum, a rolling drive device, and its peripheral member intelligibly

One embodiment of the present invention will be described below. The following embodiment is merely an embodiment and does not restrict the scope of the claims.
FIG.1 and FIG.2 is the whole side view and top view of walking type rice transplanter (1). This walking type rice transplanter (1) includes an engine (2) serving as a prime mover provided at the front end of the aircraft, a main transmission case (3) provided on the rear side of the engine (2), and the main transmission case ( 3) A traveling transmission case (4) serving as a traveling support member provided on each of the left and right sides, wheels (5) serving as left and right traveling bodies driven by power from the traveling transmission case (4), and a main transmission case (3) A main frame (6) extending rearward from the rear side surface, a planting transmission case (7) fixed to the rear end of the main frame (6), and a rear side surface of the planting transmission case (7) A rear frame (8) that is curved and extends obliquely rearward and upward, and a steering handle (9) attached to the rear end of the rear frame (8) are provided. The steering handle (9) is fixed to the rear frame (8) and cannot be repositioned. A plurality of (four) seedling planting devices (10) are attached to the lower part of the planting transmission case (7), and the seedlings supported on the front side of the rear frame (8) so as to be movable left and right. A platform (11) is provided. Therefore, this walking type rice transplanter (1) has a four-row planting configuration in which four rows of seedlings are planted simultaneously in the field while running. The engine (2), the main transmission case (3), the traveling transmission case (4), the wheels (5) and the like constitute a traveling section (traveling vehicle body), and a planting transmission case (7) and a seedling planting device. The planting part is constituted by (10), the seedling stage (11) and the like. In addition, this walking type rice transplanter (1) does not have a line drawing marker that draws a line at an agricultural field position that is an indicator of travel in the next stroke, but instead is a side marker (60 that is an indicator of the position of an adjacent planting line) ). This side marker (60) is attached to the front part of a side float (12b), which will be described later, and has a structure protruding from the side float (12b) to the left and right outside, which is the position of the adjacent planting strip.

  Moreover, the float (12) used as the several (3 pieces) grounding body which contacts a farm scene is provided in the lower part of the body, and this float (12) slides on a farm scene and leveling by the driving | running | working of a body. Among the floats (12), the center float (12a) at the center of the left and right sides of the aircraft leveles the planting position of the two seedling planting devices (10) on the left and right inner sides, and the side floats (12b) on the left and right outer sides of the aircraft Levels the planting position of one seedling planting device (10) on each of the left and right outer sides. The center float (12a) has a front end located on the front side of the front end of the side float (12b), is longer in the front / rear length than the side float (12b), is wider in the left / right width than the side float (12b), and is wider than the side float (12b). Wide grounding area. The center float (12a) and the side float (12b) are supported so as to be pivotable up and down around their respective pivotal pivot shafts (13) arranged in the same position in a side view. It is configured to move up and down following the unevenness of the field scene. The left and right wheels (5) are respectively located at the left and right center positions between the planting positions of the left and right inner seedling planting device (10) and the right and left outer seedling planting device (10). Is arranged. Accordingly, the center float (12a) is disposed between the left and right wheels (5), and the side float (12b) is disposed on the left and right outer sides of the left and right wheels (5).

  The output shaft of the engine (2) enters the main transmission case (3), and the power from the engine (2) is transmitted into the main transmission case (3). In the main transmission case (3), there is a main clutch that can cut off all transmission to the wheels (5), the seedling planting device (10) and the seedling mount (11), and power from the main clutch. A power branching portion that branches into a transmission path to the wheels (5) and a transmission path to the seedling planting device (10) and the seedling mounting table (11), the seedling planting device (10), and the seedling mounting table (11 ) On the transmission path to the seedling planting device (10) and the seedling mounting stand (11), and a switching of the gear meshing on the transmission path to the wheel (5) Can change gears by switching between a forward high speed state for road traveling, a forward low speed state for planting work, a neutral state where gears do not mesh and become non-transmission, and a reverse state, and a lower transmission of the transmission unit Left and right that can switch the transmission to the left and right wheels (5) to the non-transmission state on the side It is provided and the side clutch (61). Accordingly, the left and right traveling output shafts (101) projecting left and right from the main transmission case (3) are transmitted through the transmission and the side clutch (61). The travel output shaft (101) serves as a pivot axis for pivoting the travel transmission case (4) up and down. With the rotation of the traveling transmission case (4) in the vertical direction, the axle (14) provided at the rear end of the traveling transmission case (4) is moved up and down to move the wheel (5) up and down. Yes.

  The side clutch (61) has a cylindrical input side member (63) that rotates integrally with the center gear (62) in the main transmission case (3), and a groove (64) provided in the input side member (63). A ball (sphere) (65) that enters from the rotation outer peripheral side and an output side member (66) that covers the outside of the ball (65) are provided. Input side members (63) of the left and right side clutches (61) are arranged on the left and right sides of the center gear (62), and the left and right input side members (63) are the left and right traveling output shafts inserted therein. It is configured to rotate with (101) as the rotation axis. The output side member (66) is connected to each of the left and right travel output shafts (101) by splines, and is configured to rotate integrally with the travel output shaft (101) and can move left and right along the travel output shaft (101). It has become a structure. The output side member (66) is formed with a ball accommodating portion (67) having a large inner diameter for accommodating the ball (65) detached from the groove (64) of the input side member (63), and immediately after the ball accommodating portion (67). A ball push-in portion (68) for pushing the ball (65) into the groove (64) from the outside is formed on the left and right inner sides. The inner diameter of the ball push-in part (68) is smaller than the inner diameter of the ball housing part (67). A side clutch shifter arm (69) operated by a side clutch lever (41), which will be described later, is provided on each of the left and right sides, and the operation of the side clutch shifter arm (69) causes the output side member (66) to move left and right. Switching between a side clutch disengagement position where the ball housing portion (67) is located at a position facing (65) and a side clutch engagement position where the ball pressing portion (68) is located at a position facing the ball (65). It has a configuration. That is, at the side clutch disengaged position, the ball (65) is removed from the groove (64) of the input side member (63) by the ball being housed in the ball housing portion (67) by the centrifugal force caused by the rotation. Power is not transmitted from the member (63) to the output side member (66). On the other hand, in the side clutch engaged position, the ball pushing portion (68) forcibly pushes the ball (65) into the groove (64) of the input side member (63), so that the ball (65) from the input side member (63). The power is transmitted to the output side member (66) via, and the output side member (66) rotates integrally with the input side member (63). The output side member (66) is biased by the return compression spring (70) to the side where the side clutch (61) is engaged (outside in the left-right direction). The above-described configuration is a configuration in which the output side member (66) is moved left and right to turn the side clutch (61) on and off, but the input side member is moved to the left and right to turn on and off the side clutch. You can also Six grooves (64) and balls (65) of the input side member (63) are provided for every 60 degrees of rotation phase angle of the input side member (63) and the output side member (66). Therefore, by providing a large number of balls (65), the operation load of the side clutch (61) can be reduced and the side clutch can be immediately released.

  The travel output shaft (101) is inserted into the travel transmission case (4), a counter shaft (71) is provided at the front and rear intermediate portion of the travel transmission case (4), and the rear end of the travel transmission case (4) Is provided with an axle (14) projecting outward in the left-right direction of the fuselage. Between the first drive sprocket (102) provided on the travel output shaft (101) and the first driven sprocket (72) provided on the counter shaft (71) in the travel transmission case (4), the first A transmission chain (73) is wound around and is transmitted from the travel output shaft (101) to the counter shaft (71) by the first transmission chain (73). The number of teeth of the first driven sprocket (72) is larger than the number of teeth of the first driving sprocket (102) (the number of teeth of the first driven sprocket (72) is larger than the diameter of the first driving sprocket (102)). The diameter is large), and the first transmission chain (73) is decelerated and transmitted. Further, a second drive sprocket (74) provided on the counter shaft (71) on the outer side in the left-right direction of the first driven sprocket (72) and a second driven sprocket (103) provided on the axle (14). A second transmission chain (104) is wound between the counter shaft (71) and the axle shaft (14) by the second transmission chain (104), and the wheel (5) is driven to rotate. Note that the number of teeth of the second driven sprocket (103) is larger than the number of teeth of the second driving sprocket (74) (the second driven sprocket (103) has a larger number of teeth than the diameter of the second driving sprocket (74)). The diameter is large), and the second transmission chain (104) decelerates and transmits.

  The travel transmission case (4) includes a first transmission chain housing portion (75) that houses the first transmission chain (73), a counter shaft housing portion (76) that houses the counter shaft (71), And a second transmission chain housing part (77) for housing the second transmission chain (104), and the second transmission chain based on the first transmission chain (73) and the first transmission chain housing part (75). (104) and the second transmission chain housing portion (77) are located on the outer side in the left-right direction, and the rear part is bent in a crank shape in a plan view located on the outer side in the left-right direction. ) And the second transmission chain housing part (77), the wheel (5) is arranged on the outer side in the left-right direction.

  Further, rakes (78) for leveling the running traces of the wheels (5) formed in the farm are provided behind the left and right wheels (5), respectively. The rake (78) is attached to the machine body via a rake attachment member fixed to the seedling receiving plate (27).

  Further, the planting clutch is transmitted to the planting transmission case (7) through the planting transmission shaft (15) extending rearward from the main transmission case (3). The engine (2) and the main transmission case (3) are arranged in front of the axles (14) of the left and right wheels (5), so that the planting transmission case (7) and a plurality of seedling planting devices (10 ) And the seedling mount (11) are arranged on the rear side of the axles (14) of the left and right wheels (5).

  A hydraulic pump is fixed to the left side of the main transmission case (3), and a hydraulic valve unit is fixed to the rear of the main transmission case (3). A cylinder (elevating cylinder) (16) is fixed. The hydraulic elevating cylinder (16) includes a cylinder rod (17) serving as a moving member that moves in the front-rear direction, and is disposed above the main frame (6). Accordingly, when the hydraulic pressure from the hydraulic pump is supplied to the hydraulic lift cylinder (16) by switching the hydraulic valve unit, the cylinder rod (17) moves backward. Further, when the hydraulic pressure in the hydraulic lifting cylinder (16) is switched back to the state of returning to the main transmission case (3) serving as a hydraulic tank, the cylinder rod (17) moves forward due to the weight of the machine body. Accordingly, the hydraulic elevating cylinder (16) and the cylinder rod (17) serve as actuators. A relay link member (18) serving as a relay member is rotatably connected to a rear end portion of the cylinder rod (17) via a vertical fulcrum shaft (19). The relay link member (18) is connected to the fulcrum shaft (19) in the vertical direction at the left and right center, and has a symmetrical shape. In addition, a spring receiving portion (18b) is provided at the left and right central portion of the relay link member (18), and a compression spring (22) serving as a first urging device provided on the cylinder rod (17) is a spring receiving portion (18b). ). Therefore, the compression spring (22) provides a rotational resistance around the fulcrum shaft (19) of the relay link member (18), and the relay link member (18) rotates to the neutral position and returns in an unloaded state. It has become.

  A rolling stopper (79) is provided on the fulcrum shaft (19) at the rear end of the cylinder rod (17). The rolling stopper (79) includes left and right protrusions (79a) projecting forward of the relay link member (18) on both the left and right sides of the fulcrum shaft (19), and the relay link member (18) is connected to the fulcrum shaft (19). ) Around the fulcrum shaft (19) of the relay link member (18) is regulated by contacting the left and right projections (79a) when it rotates more than a predetermined angle. The height difference between the left and right wheels (5) does not occur extremely, and the stability of the aircraft is achieved.

  The left and right end portions of the relay link member (18) are connected to the rear end portions of the left and right connecting rods (20) via the left and right vertical connecting shafts (23). The front end of the connecting rod (20) is connected to the left and right arms (21) fixed to the upper side of the traveling transmission case (4). Therefore, the relay link member (18) receives the ground load of the wheel (5) through the traveling transmission case (4), the arm (21), and the connecting rod (20).

  An expansion / contraction part (24) for changing the effective length of the connection rod (20) is formed in the middle part of the right connection rod (20). The expansion / contraction part (24) is comprised by the external thread formed in the front part of the connection rod (20), and the internal thread formed in the rear part of the connection rod (20), and has fitted the external thread to the internal thread. Accordingly, the length of the connecting rod (20) is changed and adjusted by relatively rotating the front and rear portions of the connecting rod (20) around the axis of the connecting rod (20). Yes. In addition, the lock nut (24a) which fixes so that the front part and rear part of a connection rod (20) may not rotate relatively in the state which set the connection rod (20) to desired length is provided. On the other hand, the left connecting rod (20) is composed of an integral shaft member, has no expansion / contraction part (24), and cannot be changed in length.

  A plate-shaped restricting tool (26) serving as a restricting member is fixed to the middle portion of the connecting rod (20). The restricting tool (26) of the right connecting rod (20) is provided at the front of the connecting rod (20).

  Moreover, the elastic member (80) comprised with the leaf | plate spring which connects the rear part of a right and left connecting rod (20) is provided. This elastic member (80) is fixed to a mounting plate (81) whose left and right end portions are fixed to the lower side of each of the left and right connecting rods (20) via mounting bolts (82), and the left and right central portions are high. It has a mountain shape when viewed from the front or back of the machine body, and has a configuration in which a compression spring (22) and a cylinder rod (17) are arranged below the left and right central portions of the elastic member (80). Therefore, the elastic member (80) gives resistance to the opposite back-and-forth movement of the left and right connecting rods (20), and the relay link member (18) rotates to the neutral position and returns in an unloaded state. In addition, since the left and right central portions of the elastic member (80) are mountain-shaped, the elastic member (80) does not interfere with the compression spring (22) and the cylinder rod (17). In addition, the elastic member (80) is positioned behind the restricting tool (26) and the frame (25) regardless of the vertical movement position of the wheel (5), that is, the longitudinal movement position of the connecting rod (20). ing. Note that the elastic member (80) may be disposed at a position closer to the front and disposed above the hydraulic lifting cylinder (16).

  Therefore, when the hydraulic valve unit is switched to supply the hydraulic pressure from the hydraulic pump into the hydraulic lifting cylinder (16), the cylinder rod (17) moves rearward, the relay link member (18) moves rearward, The relay link member (18) pulls the left and right connecting rods (20) to the rear side via the connecting shaft (23) and rotates the left and right arms (21) to the rear side, thereby moving the left and right traveling transmission cases ( 4) rotates downward, and the left and right wheels (5) move downward to raise the aircraft relative to the field. Conversely, when the hydraulic valve unit is switched to return the hydraulic pressure in the hydraulic lift cylinder (16) to the main transmission case (3), the left and right arms (21) are connected to the left and right arms by the ground load of the left and right wheels (5). The cylinder rod (17) is returned to the front through the rod (20), the relay link member (18), etc., and the left and right wheels (5) are moved upward to lower the aircraft relative to the field. Further, when the cylinder rod (17) moves rearward to the end of the operation stroke in order to move the left and right wheels (5) most downward to raise the airframe, the left and right restrictors (26) are moved from the front side to the frame (25 ), The rotation of the relay link member (18) around the fulcrum shaft (19) is restricted, and the left and right wheels (5) are restricted from moving up and down in a reciprocal manner.

  The relay link member (18) is against the compression spring (22) and the elastic member (80) so that the left and right wheels (5) follow the left-right inclination of the farm cultivator and the unevenness of the farm cultivator. Although it tries to turn about (19) temporarily, it rotates to return the relay link member (18) to the neutral position by the compression spring (22) and the elastic member (80), and the right and left rolling posture of the machine body To prevent the aircraft from becoming unstable in the horizontal tilting posture. In addition, the left-right inclination posture of the airframe can be adjusted by changing and adjusting the length of the right connecting rod (20) by the expansion / contraction part (24).

  The seedling planting device (10) and the seedling mount (11) are operated by power from the planting transmission case (7). The seedling mount (11) is supported from both left and right ends of a left and right moving shaft (29) protruding left and right of the planting transmission case (7) via left and right connecting members (30). It moves back and forth along (27) and supplies seedlings one by one to the seedling inlet (28) of each strip provided on the seedling receiving plate (27). A left / right moving rail (34) is fixedly provided on the upper part of the seedling stage (11), and the left / right moving rail (34) is supported from the upper part of the rear frame (8). 33) and supported so as to be movable left and right. Accordingly, the seedling stage (11) is supported by the seedling receiving plate (27) so as to be movable left and right at the lower part and supported by the support roller (33) so as to be movable left and right at the upper part. It is configured to reciprocate to the left and right via the left and right moving shaft (29) by power. In addition, the seedling stage (11) is provided with a seedling feeding belt (35) for each strip for transferring seedlings to the seedling outlet (28) side (lower side) at the left and right moving ends. The seedling feeding belt (35) is operated by the power from the planting transmission case (7), transfers one mat seedling at the left and right moving ends of the seedling mounting base (11), and transfers the seedling to the seedling outlet (28 ).

  The seedling planting device (10) is a crank type that is attached to the lower portion of the planting transmission case (7) and is operated by power from the planting transmission case (7), and the separation claw (31) is a seedling outlet. (28) The upper seedling is scraped off and the scraped seedling is pushed out by the pushing tool (32) toward the field scene to plant the seedling in the field.

  By the way, the left and right seedling receiving plate protection frames (105) for protecting the seedling receiving plate (27) are provided on the left and right outer sides of the seedling receiving plate (27). The seedling plate protection frame (105) is formed to be bent in a U shape in plan view. The left and right ends of the left and right seedling receiving plate protection frames (105) are the left and right outermost ends of the aircraft. In addition, in order to narrow the left-right width | variety of a body, it is good also as a structure which does not mount | wear with the right and left seedling receiving plate protection frame (105).

  The transmission configuration in the planting transmission case (7) will be described. The plant is transmitted to the bevel gear (107) via the safety clutch (106) on the planting transmission shaft (15). The safety clutch (106) is a clutch that cuts off transmission when overloaded, and is configured to adjust the load when the clutch is disengaged by adjusting the spring load of the clutch. Power is transmitted to the transmission shaft (108) extending in the left-right direction via the bevel gear (107), and a plurality of sets (three sets) of planting drive sprockets (109), a planting chain (110), and It transmits to a several seedling planting apparatus (10) via the planting transmission member (112) which consists of a driven sprocket (111) for planting. The plurality of planting transmission members (112) are transmitted to the seedling planting device (10) at the center of the left and right through the planting transmission member (112) at the left and right center among the plurality of planting transmission members (112). The left and right outermost planting transmission members (112) of (112) are transmitted to the left and right outermost one seedling planting device (10). Further, the seedling platform (11) is connected to the transmission shaft (108) via a left / right movement transmission member (115) comprising a plurality of (two pairs) left / right movement drive gears (113) and a left / right movement driven gear (114). ) Is transmitted to a left / right moving mechanism (116) that moves the left / right. The left-right movement transmission member (115) is a gear train that is transmitted from a plurality of pairs of gear trains composed of a plurality of pairs (two pairs) of left-right movement drive gears (113) and a left-right movement driven gear (114). Alternatively, the transmission ratio can be switched. The left / right moving mechanism (116) is driven by power from the left / right moving transmission member (115) (rotates integrally with the left / right moving driven gear (114)) and extends in the left / right direction, and a lead cam shaft. A lead cam (118) that moves left and right by the rotation of (117) and a left and right moving shaft (29) that moves left and right integrally with the lead cam (118) are provided. The lead cam shaft (117) has a well-known configuration having an oblique lead groove. The left and right end portions of the left and right moving shaft (29) protrude to the left and right outside of the planting transmission case (7) and are connected to the seedling table (11) via the connecting member (30). Accordingly, the seedling stage (11) is configured to reciprocate left and right integrally with the left and right moving shaft (29) as the left and right moving shaft (29) moves left and right. In addition, it has the structure which transmits to the seedling feed belt (35) of each strip | line through the seedling feed drive shaft which rotates integrally with a lead cam shaft (117).

  The planting transmission shaft (15) is arranged immediately on the right side of the left and right center planting transmission member (112), and the left and right movement transmission member (115) is on the left side of the middle planting transmission member (112). Is arranged. Further, the planting transmission shaft (15) and the left-right movement transmission member (115) are arranged in the left-right direction closest to the planting transmission member (112) at the center of the left and right of the plurality of planting transmission members (112). Placed in position. Therefore, the planting transmission shaft (15) and the left-right movement transmission member (115) are arranged separately on the left and right of the planting transmission member (112) at the center of the left and right. Further, the centering left and right planting transmission member (112) and the planting transmission shaft (15) are larger than the space between the left and right centering planting transmission member (112) and the left and right moving transmission member (115). ) Between the left and right directions.

  A main clutch that can cut off transmission to the wheel (5), the seedling planting device (10), and the seedling stage (11) on the front side of the steering handle (9) and on the rear side of the seedling stage (11). Lever (36), planting lifting lever for switching the oil passage of the hydraulic valve unit to cut off transmission to the seedling planting device (10) and seedling mounting base (11) and to operate the hydraulic lifting cylinder (16) (37). The main clutch lever (36) is configured to be operated in two operation positions, an on position and a disengagement position. The main clutch lever (36) is operated by operating the main clutch in the main transmission case (3) to be in a transmission state and a non-transmission state. Switch to. The planting lifting / lowering lever (37) is configured to be operated in four operation positions including a planting position, a lowered position, a neutral position, and a raised position, and operates a planting clutch in the main transmission case (3). Then, the planting transmission shaft (15) is switched between a driving state and a non-driving state, and the hydraulic lifting cylinder (16) is operated to move the left and right wheels (5) up and down. That is, when operated to the planting position, the planting clutch (10) and the planting platform (11) are operated with the planting clutch in the transmission state, and the left and right wheels (5) are brought into contact with the ground due to their own weight. As a result, the hydraulic pressure in the hydraulic lift cylinder (16) is returned to the main transmission case (3), the left and right wheels (5) are moved up, the aircraft is lowered, and the float (12) is brought into a grounded state. When operated to the lowered position, the planting clutch is brought into a non-transmission state in a state where the machine body is lowered as described above, and the operations of the seedling planting device (10) and the seedling placing stand (11) are stopped. When operated to the neutral position, the hydraulic passage is closed by shutting off the oil passage to the hydraulic lifting cylinder (16) with the operation of the seedling planting device (10) and the seedling mounting stand (11) stopped as described above. The operation of the cylinder (16) is fixed, and the left and right wheels (5) are fixed at an arbitrary vertical position to stop the elevation of the aircraft. When operated to the raised position, hydraulic pressure is supplied into the hydraulic lifting cylinder (16) with the operation of the seedling planting device (10) and the seedling mounting stand (11) stopped as described above, and the left and right wheels (5) is moved downward to raise the fuselage, and the float (12) is in a non-grounded state. Moreover, it is the structure which switches the oil path of a hydraulic valve unit via the rod connected with the front part of this center float (12a) by the vertical motion of a center float (12a), and the front part of a center float (12a) When the motor moves upward, the hydraulic pressure is supplied into the hydraulic lifting cylinder (16) to move the left and right wheels (5) downward. Therefore, when the planting lift lever (37) is in the planting position and the lowered position, the center float (12a) contacts the field scene and moves up and down to bring the center float (12a) into a desired front and back posture. The left and right wheels (5) move up and down so that the aircraft is controlled to rise and fall to a predetermined ground height.

  On the front side of the steering handle (9) and the seedling platform (11), there are a transmission lever (38) for operating the transmission section in the main transmission case (3), and a recoil knob (for starting the engine (2)) ( 39). The engine (2) and the recoil knob (39) at the front end of the machine body are connected by a recoil rope (40). The left and right side clutch levers (41) are provided below the left and right handle grips (9a) of the steering handle (9), and the left and right side clutch levers (41) are provided in the main transmission case (3). The side clutch (61) is operated. A planting depth adjusting lever (42) is provided on the left side of the rear frame (8) on the diagonally lower front side of the steering handle (9), and the lever (42) is operated by operating the planting depth adjusting lever (42). 42) the planting depth adjusting shaft (53) in the left-right direction rotating integrally with the planting depth adjusting shaft (53), and each planting depth adjusting arm (54) rotating together with the planting depth adjusting shaft (53). By changing the vertical position of the rotation fulcrum shaft (13) of each float (12) with respect to the machine body, the planting depth of the seedlings by the seedling planting device (10) can be changed and adjusted. . The pivot fulcrum shaft (13) is welded and fixed to the planting depth adjusting arm (54). A seedling collection amount adjusting lever (65) is provided on the right side of the rear frame (8) on the diagonally lower front side of the steering handle (9), and the seedling receiving plate (27) is operated by operating the seedling amount adjusting lever (65). ) To the seedling planting device (10) is changed, and the amount of seedlings per strain by the seedling planting device (10) can be changed and adjusted.

A bonnet cover (43) is provided above the engine (2) and the main transmission case (3). A fuel tank (44) is provided above the engine (2).
A preliminary seedling stage (45) on which a preliminary seedling is placed is provided at a position extending from above the rear part of the bonnet cover (43) to above the front part of the planting transmission case (7). This preliminary seedling stage (45) is composed of a frame that combines rods, and is fixed to and supported by the preliminary seedling stage support frame (46). Therefore, the preliminary seedling stage (45) is configured not to move back and forth. Rising parts (47) are provided on the front, rear, left and right sides of the preliminary seedling stage (45) so that the seedlings mounted by the rising parts (47) do not fall off. The preliminary seedling stage (45) has a width of about 60 cm in front and rear and a width of about 120 cm in width so that four mat seedlings with a length of about 60 cm and a width of about 30 cm can be placed. Therefore, the preliminary seedling mounting table (45) can be mounted by arranging four mat seedlings with the longitudinal direction in the front-rear direction. In order to facilitate seedling transportation, seedlings may be handled in the form of rolled seedlings wound with matted seedlings, but these rolled seedlings can also be placed on the spare seedling stage (45). At this time, since the rising parts (47) on the four sides are set relatively high, it is possible to prevent the rolled seedlings placed on the preliminary seedling placing table (45) from falling off and falling. In addition, the preliminary seedling stage (45) is disposed above the axles (14) of the left and right wheels (5) in a side view, and the front and rear center of the preliminary seedling stage (45) and the axle (14) are the same front and rear. The position is set.

  The preliminary seedling support frame (46) is disposed between the bonnet cover (43) and the planting transmission case (7) (planting section). A bonnet cover support member (50) extending obliquely forward and upward to support the rear part of the bonnet cover (43) is fixed to the fixing member (49) for fixing the preliminary seedling stage support frame (46) with the main frame (6). It is stuck. Thereby, the support intensity | strength of a bonnet cover support member (50) improves, and a bonnet cover (43) can be supported firmly reliably. Even if the bonnet cover support member (50) is supported from the main frame (6) without the fixing member (49), the bonnet cover support member (50) is supported near the fixing member (49). If comprised, the support strength of a bonnet cover support member (50) can be improved. Further, if the bonnet cover support member (50) is supported from the preliminary seedling support base frame (46), the bonnet cover support member (50) is improved while improving the support strength of the bonnet cover support member (50). It can be shortened and made compact, reducing the weight and cost.

  A protective frame (51) for protecting the engine (2), the main transmission case (3), the bonnet cover (43) and the like from obstacles ahead of the aircraft is provided at the front of the aircraft. The protective frame (51) includes left and right attachment portions (51a) extending from the left and right side surfaces of the main transmission case (3) to the front side, and a protection portion (a front end portion of the machine body connecting the left and right attachment portions (51a)). 51b). The protective portion (51b) is configured in a horizontal shape extending straight from side to side.

  When loading and fixing the airframe on the truck bed, the ropes are hung on the left and right ends of the left and right central parts of the protective part (51b), and the ropes are hung on the hooks (52) fixed to the upper part of the rear frame (8). The three parts of the fuselage are fixed and firmly fixed to the loading platform.

  In this walking type rice transplanter (1), the operator holds the left and right handle grips (9a) of the steering handle (9) and operates the planting lift lever (37) to the planting position to lower the aircraft. By putting the planting part into an operable state and operating the main clutch lever (36) to the on position to operate the planting part while driving the aircraft, four seedlings are planted simultaneously in the field. When reaching the edge of the field, the planting lift lever (37) is operated to the raised position to stop the operation of the planting unit, the machine body is raised, and the side clutch lever (41) inside the turn is operated to turn. The side clutch (61) of the inner wheel (5) is disconnected, and the aircraft is turned. When the aircraft is turning, the aircraft is raised by operating the planting lift lever (37) to the raised position. When the aircraft is raised to a desired height, the planting lift lever (37) is operated to the neutral position. For example, the aircraft can be fixed at the height, and the operator can easily turn the aircraft. Thereafter, similarly, the planting lift lever (37) is operated to the planting position to perform the planting operation in the next step, and planting seedlings in the field. When traveling on the road or the like, the body is raised and travels by appropriately operating the speed change lever (38).

  In the above description, the configuration in which the compression spring (22) is used as the first urging device has been described, but a configuration in which a rolling suppression leaf spring (83) is provided instead of the compression spring (22) may be employed. The rolling restraining leaf spring (83) is attached to the leaf spring mounting member (84) fixed to the rear end of the cylinder rod (17) and the fulcrum shaft (19), and both left and right sides of the fulcrum shaft (19). Are provided respectively. On the other hand, the relay link member (18) is provided with a contact member (85) constituted by a pin in the vertical direction at a position where the rolling suppression leaf spring (83) is in contact with the left and right rolling suppression leaf springs (83). Correspondingly, left and right are fixedly provided. Therefore, when the left and right rolling restraining leaf springs (83) and the left and right contact members (85) are in contact, the left and right rolling restraining leaf springs (83) bias the relay link member (18) toward the neutral side. To do. Thereby, the left-right inclination posture of the airframe can be stabilized, and the straightness of the airframe is improved. Instead of the rolling restraining leaf spring (83), a torsion spring may be used.

  Moreover, it can also be set as the structure which provides a right-and-left expansion | extension part in the middle part of a right-and-left connection rod (20), and provides the 2nd urging | biasing apparatus which urges | contracts expansion / contraction to an expansion / contraction part. The expansion / contraction part is constituted by a spring case that allows the front and rear rod parts of the connecting rod (20) to slide relative to each other. The expansion / contraction part is expanded / contracted according to the ground load of the wheel (5) by an expansion / contraction compression spring provided inside the spring case. It is the composition to do. And the load of the compression spring for expansion / contraction in contraction of the expansion / contraction part is a first urging device (for example, compression spring (22)) when the connecting rod (20) is moved back and forth by the same amount as the contraction amount of the expansion / contraction part. ) Is set smaller than the load. Therefore, the quick extension / contraction operation of the extension / contraction part allows the left and right wheels (5) to be moved up and down independently corresponding to the local unevenness of the field, and the aircraft tilts left and right due to the local unevenness of the field. It can be suppressed. The extendable part may be constituted by a hydraulic or pneumatic damper instead of the spring case. Thereby, since an impact can be absorbed efficiently, durability of an expansion-contraction part also improves. In addition, when the expansion / contraction part is composed of a damper, it is possible to adjust the speed of vertical movement of the wheel (5) (adjustment of response to the field) by providing a flow rate adjustment valve such as the hydraulic pressure or air of the damper. Good running performance can be obtained corresponding to the conditions.

  In addition, you may comprise an elastic member (80) not with the above-mentioned leaf | plate spring but with a round shaft with a circular cross section. A support tool (86) extending upward from the hydraulic lift cylinder (16) is provided, and the support tool (86) can support the left and right intermediate portions of the elastic member (80) so as not to move back and forth. . When the elastic member (80) is constituted by a round shaft, the round shaft is supported so as to be rotatable around the left and right axis in a cylinder provided at the upper end of the support (86). This further increases the resistance of the left and right connecting rods (20) to move in the opposite direction, thereby further suppressing the opposite vertical movements of the left and right wheels (5). In addition, it is good also as a structure which comprises a support tool (86) with an elastic material and the elastic restoring force of a support tool (86) acts on the vertical motion of a right-and-left wheel (5).

  Further, as a different configuration, the main transmission case (3) may be configured to transmit to the traveling transmission case (4) through the counter case, and the height of the wheel (5) may be adjusted depending on the mounting posture of the counter case. . More specifically, when the counter case is configured to transmit from the input shaft to the output shaft by a pair of gears, and the counter case is attached to the main transmission case (3) in a posture in which the output shaft is higher than the input shaft, If the counter case is attached to the main transmission case (3) in a posture where the output shaft is lower than the input shaft, the wheel (5) is set to a low position. Thus, the height position of the wheel (5) can be set to correspond to the depth of the cultivating field in the field. For example, the wheel (5) can be set to a low position to correspond to the wet field. The mounting flange portion of the counter case to the main transmission case (3) is configured such that the plurality of bolt insertion holes are arranged at the same position even when rotated 180 degrees around the transmission shaft. Even if the counter case is rotated 180 degrees so as to switch the height of the shaft, it can be attached to the main transmission case (3).

  Further, as a different configuration, a rolling drive device (87) for forcibly changing the vertical position of the left and right wheels (5) by providing an expansion / contraction actuator on one of the left and right connecting rods (20) is provided. A pendulum (88) for detecting the tilting posture may be provided, and the rolling driving device (87) may be controlled based on the operation of the pendulum (88) so as to make the left-right tilting posture of the airframe desired. At this time, when hunting occurs in rolling control of the airframe in a field with severe unevenness, the pendulum (88) can be fixed so as not to swing left and right, and the rolling drive device (87) cannot be operated. If the pendulum (88) is fixed by raising a friction plate (89) such as a rubber plate from the lower side and bringing it into contact with the bottom surface of the pendulum (88), the pendulum (88) will swing slightly from side to side. The pendulum (88) can be fixed even when the pendulum is in the fixed state, and the pendulum (88) can be easily fixed. Conventionally, since the pendulum is fixed by inserting a fixing pin into the pendulum or the like, it is necessary to insert the fixing pin after the pendulum is adjusted to the fixing position, and it may be difficult to fix the pendulum.

  As described above, the walking type rice transplanter (1) according to the embodiment of the present invention has the left and right wheels (5) and the left and right travelings that support the wheels (5) on the rear end and rotate in the vertical direction. Following the movement in the front-rear direction of the transmission case (4), the left and right arms (21) that rotate integrally with the traveling transmission case (4), and the cylinder rod (17) of the lift cylinder (16) A relay link member (18) that moves to the left and right, and left and right connecting rods (20) that connect the left and right ends of the relay link member (18) and the arm (21). The relay link member (18) It is configured to be rotatable around a vertical fulcrum shaft (19) disposed between the left and right connecting rods (20), and the right and left connecting rods (20) are extended and adjusted by the extension / contraction part (24). The right and left other connecting rod 20) has a configuration that can not change the length.

  Accordingly, the relay link member (18) rotates around the fulcrum shaft (19) in the vertical direction following the left-right inclination of the farm cultivator and the unevenness of the farm cultivator, and the left and right wheels (5) conflict. Then, it moves up and down to maintain the left and right tilting posture of the aircraft in a desired posture. Since the length of one of the left and right connecting rods (20) can be adjusted by the telescopic part (24), the left and right wheels such as the relay link member (18), the left and right connecting rods (20), and the left and right arms (21). Regardless of the assembly error of the vertical movement mechanism of (5) or the secular change of the vertical movement mechanism, the left and right wheels (5) can be evenly linked, and the vertical movement of the left and right wheels (5) is balanced. It is possible to perform right and left rolling of the aircraft properly and maintain the seedling planting posture and planting depth appropriately. In addition, since the length of the other connecting rod (20) on the left and right cannot be changed and the length of only the one connecting rod (20) on the left and right is adjusted, the relative upper and lower sides of the left and right wheels (5) can be adjusted. The position can be easily adjusted, and the structure can be simplified and the cost can be reduced by providing the expansion / contraction part (24) only on the left and right connecting rods (20).

  The left and right connecting rods (20) are each provided with a restricting member (26), and the right and left restricting members (26) are moved as the elevating cylinder (16) is operated to lower the left and right wheels (5). Is configured to restrict the left and right wheels (5) from moving up and down reciprocally in contact with the frame (25) of the fuselage.

  Therefore, when the aircraft is traveling on the road or when the aircraft is loaded onto a truck, if the left and right wheels (5) are lowered and the aircraft is raised, the right and left wheels (5) are moved up and down by the restricting member (26). Since it is regulated, it can travel with the attitude of the airframe stabilized, and the operability and safety are improved.

  Further, the power from the prime mover (2) is transmitted into the main transmission case (3), and transmitted from the main transmission case (3) into the planting transmission case (7) via the planting transmission shaft (15). And it is set as the structure transmitted to a some seedling planting apparatus (10) via the some transmission member (112) from the transmission shaft (108) provided in the planting transmission case (7) extended in the left-right direction. The plurality of planting transmission members (112) are transmitted to the seedling planting device (10) at the center of the left and right through the planting transmission member (112) at the center of the left and right. Each of the members (112) is transmitted to the outermost right and left outermost seedling planting device (10) via the left and right outermost planting transmission member (112), and moved left and right from the transmission shaft (108). Is transmitted to the left-right movement mechanism (116) for moving the seedling stage (11) to the left and right via the transmission member (115). It is set as the structure, and it is set as the structure which a seedling planting apparatus (10) scrapes the seedlings on a seedling mounting stand (11) one by one at a time, and plantes it in a farm field, a planting transmission shaft (15) and a transmission member for right-and-left movement (115) Of the plurality of planting transmission members (112) at a position in the left-right direction closest to the central planting transmission member (112) in the left and right, and the planting transmission member (112) in the middle of the left and right A safety clutch (106) that is arranged to be distributed to the left and right and cuts off the transmission due to overload is provided on the planting transmission shaft (15).

  Therefore, the mechanical lock can be prevented from occurring in the plurality of seedling planting devices (10) by the common safety clutch (106). Moreover, since the common safety clutch (106) is disposed near the planting transmission member (112) that is transmitted to the two seedling planting devices (10) in the center of the left and right, a plurality of seedling planting devices (10 ) Can be efficiently received and the operation can be ensured, and the plurality of seedling planting devices (10) and the transmission mechanism to the plurality of seedling planting devices (10) can be reliably prevented.

  Further, the centering left and right planting transmission member (115) and the planting transmission shaft (15) are larger than the space between the left and right centering planting transmission member (112) and the left and right movement transmission member (115). ) Between the left and right directions.

Therefore, the drive resistance of a plurality of seedling planting devices (10) can be received efficiently, and the operation can be ensured.
Further, the power from the prime mover (2) is transmitted into the main transmission case (3) and transmitted from the main transmission case (3) to the left and right wheels (5) via the left and right traveling transmission cases (4). Then, a plurality of seedling planting devices are transmitted from the main transmission case (3) to the planting transmission case (7) through the planting transmission shaft (15), and transmitted from the planting transmission case (7). (10) and the seedling mounting table (11) are configured to transmit, and the seedling planting device (10) for each strain of seedlings on the seedling mounting table (11) while moving the seedling mounting table (11) left and right. Scraping and planting in the field, the prime mover (2) and the main transmission case (3) are arranged in front of the axles (14) of the left and right wheels (5), and the planting transmission case (7), multiple The seedling planting device (10) and the seedling mounting stand (11) are connected to the axles (14) of the left and right wheels (5). Arranged on rear side, disposed above each of the axles of the left and right wheels preliminary seedling load platform which does not move in the longitudinal direction relative to the body (45) in side view (5) (14).

  Therefore, the prime mover (2) and the main transmission case (3), which are heavy objects, and the planting part are arranged separately on the front and rear of the axle (14), and the spare seedling platform (45) that becomes heavy by placing seedlings is viewed from the side. Therefore, the front / rear weight balance of the airframe can be improved, and the driving propulsion force by the left and right wheels (5) can be improved. Moreover, since the preliminary seedling stage (45) does not move in the front-rear direction with respect to the airframe, it is possible to prevent the front-rear weight balance of the airframe from being lost and further improve the running performance.

  Further, in each of the left and right traveling transmission cases (4), a traveling output shaft (101) and an axle (14) protruding laterally from the main transmission case (3) are inserted and provided on the traveling output shaft (101). The transmission chain (104) is wound around the drive sprocket (102) and the driven sprocket (103) provided on the axle (14).

  Therefore, since the traveling propulsion force by the left and right wheels (5) is improved, the traveling transmission case (4) can be transmitted to the wheels (5) with a small reduction ratio by the single transmission chain (104). The transmission configuration can be simplified and the cost can be reduced.

In addition, the steering handle (9) provided at the rear end of the aircraft is fixed to the aircraft so that the position cannot be changed.
Therefore, the operation load applied to the steering handle (9) can be properly maintained, and the operability is improved. Further, the mechanism for changing the position of the steering handle (9) can be omitted, and the cost can be reduced.

  The seedling stage (11) moves left and right along the seedling receiving plate (27) and supplies seedlings one by one to the seedling inlet (28) of each strip provided on the seedling receiving plate (27). The seedling planting device (10) is configured to scrape the seedling on the seedling outlet (28) and plant it in the field, and is provided with a line-drawing marker that draws a line at the field position that serves as an indicator for the next stroke. The right and left ends of the seedling receiving plate (27) or the left and right ends of the seedling receiving plate protection frame (105) that protects the seedling receiving plate (27) are the left and right outermost ends of the aircraft.

  Therefore, conventionally, the drawing marker located on the left and right outermost sides of the airframe can be omitted even in a standing state that generally does not draw, so the left-right width of the airframe can be reduced, and the airframe can be made compact and the cost can be reduced.

  The seedling stage (11) moves left and right along the seedling receiving plate (27) and supplies seedlings one by one to the seedling inlet (28) of each strip provided on the seedling receiving plate (27). The seedling planting device (10) is configured to scrape the seedling on the seedling outlet (28) and plant it in the field without providing a seedling receiving plate protection frame for protecting the seedling receiving plate (27). The left and right ends of the seedling receiving plate (27) are the left and right outermost ends of the aircraft.

  Therefore, since the seedling receiving plate protection frame (105) for protecting the seedling receiving plate (27) can be omitted, the left and right widths of the aircraft can be reduced, the aircraft can be made compact, and the cost can be reduced.

  Further, a plurality of floats (12) that come in contact with the farm scene are supported so as to be pivotable up and down around each of the left and right pivot points (13), and the pivot point (13) is welded to the tip. Each planting depth adjusting arm (54) fixed in this manner is fixed to the planting depth adjusting shaft (53) and the planting depth adjusting shaft is centered on the planting depth adjusting shaft (53). The planting depth adjusting lever (42) for rotating the planting depth adjusting shaft (53) is provided so as to rotate up and down integrally with (53).

Therefore, since the rotation fulcrum shaft (13) is welded and fixed to the planting depth adjusting arm (54), the structure can be simplified and the cost can be reduced.
The walking type rice transplanter (1) includes left and right wheels (5), left and right traveling transmission cases (4) that support the wheels (5) at the rear end and rotate in the vertical direction, A relay link member (18) that moves back and forth following the movement in the front-rear direction of the left and right arms (21) that rotate integrally with the travel transmission case (4) and the cylinder rod (17) of the lift cylinder (16). ) And the left and right connecting rods (20) for connecting the left and right ends of the relay link member (18) and the arm (21). The relay link member (18) is connected to the left and right connecting rods (20). An elastic member (80) that is configured to be rotatable about a vertical fulcrum shaft (19) disposed therebetween and that connects the left and right connecting rods (20) separately from the relay link member (18) is provided.

  Accordingly, the relay link member (18) rotates around the fulcrum shaft (19) in the vertical direction following the left-right inclination of the farm cultivator and the unevenness of the farm cultivator, and the left and right wheels (5) conflict. Then, it moves up and down to maintain the left and right tilting posture of the aircraft in a desired posture. In addition, the elastic member (80) provides resistance to opposite vertical movements of the left and right wheels (5), prevents the aircraft from abruptly tilting left and right, stabilizes the attitude of the aircraft, and improves operability and safety. Improvement can be achieved and driving performance and planting performance can be improved. Moreover, the elastic member (80) is attached to the left and right connecting rods (20) that move back and forth as the left and right wheels (5) move up and down, and moves back and forth as the wheels (5) move up and down. In addition, the vertical width of the moving space of the elastic member (80) can be reduced, and thus the center of gravity of the aircraft can be lowered, operability and safety can be improved, and traveling performance and planting performance can be improved. .

Moreover, the elastic member (80) was arrange | positioned above the raising / lowering cylinder (16) or the cylinder rod (17).
Therefore, the elastic member (80) can be arranged as high as possible, and mud in the field is attached to reduce the function of the elastic member (80), or the elastic member (80) interferes with the float leveling the field and leveling is possible. It is possible to prevent malfunctions that become worse.

  The left and right connecting rods (20) are each provided with a restricting member (26), and the right and left restricting members (26) are moved as the elevating cylinder (16) is operated to lower the left and right wheels (5). Is configured to restrict the left and right wheels (5) from moving up and down reciprocally in contact with the frame (25) of the fuselage, and is opposite to the regulating member (26) in the front-rear direction with respect to the frame (25). An elastic member (80) was placed on the side.

  Therefore, when the aircraft is traveling on the road or when the aircraft is loaded onto a truck, if the left and right wheels (5) are lowered and the aircraft is raised, the right and left wheels (5) are moved up and down by the restricting member (26). Since it is regulated, it can travel with the attitude of the airframe stabilized, and the operability and safety are improved. Since the elastic member (80) is disposed on the opposite side of the restricting member (26) in the front-rear direction with respect to the frame (25), the restricting member (26) and the elastic member (80) are arranged in the front and rear of the frame (25). The aircraft can be made compact.

  Further, a center float (12a) disposed between the left and right wheels (5) and a side float (12b) disposed on the left and right outer sides of the left and right wheels (5) are provided, and left and right of the center float (12a) are provided. The left and right width of the side float (12b) is smaller than the width, and the traveling transmission case (4) is transmitted to the left and right counter shaft (71) by the first transmission chain (73), and the counter shaft (71 ) To the axle (14) of the wheel (5) via the second transmission chain (104), and a first transmission chain housing part (75) for housing the first transmission chain (73); A counter shaft accommodating portion (76) for accommodating the counter shaft (71); and a second transmission chain accommodating portion (77) for accommodating the second transmission chain (104), the first transmission chain (73) and first The second transmission chain (104) and the second transmission chain are positioned with the second transmission chain (104) and the second transmission chain storage part (77) positioned outward in the left-right direction with respect to the dynamic chain storage part (75). The wheel (5) was arranged on the outer side in the left-right direction of the housing part (77).

  Therefore, the first transmission chain (73) and the second transmission chain (104) can be decelerated in stages, so that the rotational speed of the wheel (5) can be set as desired. Furthermore, since the first transmission chain housing portion (75) is located on the inner side in the left-right direction with respect to the second transmission chain housing portion (77), the traveling transmission case (4) as a whole is based on the wheels (5) as much as possible. It can be placed inside the aircraft in the left-right direction, can suppress mud pushing to the left and right outside generated by the traveling transmission case (4), and prevents mud pushing to the left and right outside of the aircraft even with side floats (12b) with small left and right widths And planting performance can be improved.

  Moreover, the center float (12a) levels the planting position of the two seedling planting devices (10) on the left and right inner sides, and the side float (12b) has one seedling planting device (10) on each of the left and right outer sides. The planting position was set to level, and a rake (78) for leveling the farm was placed behind the wheel (5).

  Therefore, even if the side float (12b) has a small left-right width in which the planting position of the single seedling planting device (10) on each of the left and right outer sides is leveled, a rake (78) is provided near the planting position. Can improve the leveling and improve the planting performance.

  Also, left and right side clutches (61) for turning on and off the transmission to the left and right wheels (5) are provided, and the side clutch (61) includes an input side member (63) that rotates about the rotation axis, and an input A ball (65) that enters the groove (64) provided in the side member (63), and the ball (65) is rotated by the input side member (63) rotating in a state where the ball (65) enters the groove (64). And an output side member (66) that rotates about the rotation axis, and moves the output side member (66) in a direction along the rotation axis to thereby move the ball (65) and the input side. The transmission between the member (63) or the output side member (66) is cut off, and six balls (65) are provided at every rotation phase angle of 60 degrees around the rotation axis.

  Therefore, it is possible to turn the airframe with the side clutch (61) inside the turning turned off. Further, the movement resistance that moves the output side member (66) in the direction along the rotational axis can be reduced by a large number (six) of the balls (65) arranged at every rotation phase angle of 60 degrees. 61), the operability is improved, and the side clutch (61) can be immediately disengaged to make a proper small turn.

A first urging device that urges rotation about the fulcrum shaft (19) of the relay link member (18) is provided between the cylinder rod (17) and the relay link member (18). It was.
Therefore, since the first urging device urges the relay link member (18) to the side that suppresses the height difference between the left and right wheels (5), it is possible to suppress the aircraft from being greatly inclined to the left and right. It is possible to improve the performance and improve the running performance and planting performance.

  In addition, the left and right connecting rods (20) are configured to be extendable / contractable by the respective expansion / contraction portions, and the expansion / contraction portions are provided with a second urging device that urges expansion / contraction, and the first urging device connects the connecting rods ( The biasing force for biasing the connecting rod (20) by the second biasing device is smaller than the biasing force for biasing 20).

  Therefore, the left and right wheels (5) can be moved up and down independently in correspondence with local unevenness in the field, and the aircraft can be prevented from tilting left and right due to local unevenness in the field. This improves the operability and safety, and improves the running performance and planting performance.

Further, a support tool (86) for supporting the left and right intermediate portions of the elastic member (80) so as not to move back and forth is provided.
Therefore, the opposite vertical movements of the left and right wheels (5) can be suppressed, the aircraft can be prevented from inclining to the left and right, the attitude of the aircraft can be stabilized, and the operability and safety can be improved. Performance and planting performance can be improved.

Claims (9)

  The left and right wheels (5), the left and right traveling transmission cases (4) that support the wheels (5) at the rear end and rotate in the vertical direction, and the traveling transmission case (4) rotate together. Each of the left and right arms (21), the relay link member (18) that moves back and forth following the movement of the cylinder rod (17) of the elevating cylinder (16), and the relay link member (18). Left and right connecting rods (20) for connecting the left and right ends and the arm (21) are provided, and the relay link member (18) is a vertical fulcrum shaft (19) disposed between the left and right connecting rods (20). ), And is provided with an elastic member (80) that connects the left and right connecting rods (20) separately from the relay link member (18).   The walking type rice transplanter according to claim 1, wherein the elastic member (80) is arranged above the elevating cylinder (16) or the cylinder rod (17).   The left and right connecting rods (20) are each provided with a restricting member (26), and the right and left restricting members (26) are mounted on the fuselage as the elevating cylinder (16) is operated to lower the left and right wheels (5). The frame (25) is in contact with the left and right wheels (5) to prevent the left and right wheels (5) from moving up and down in a reciprocal manner. The walking type rice transplanter according to claim 1 or 2, wherein an elastic member (80) is arranged.   A center float (12a) disposed between the left and right wheels (5) and a side float (12b) disposed on the left and right outer sides of the left and right wheels (5) are provided, and from the lateral width of the center float (12a) The side float (12b) has a small left and right width, and the traveling transmission case (4) is transmitted to the counter shaft (71) in the left and right direction by the first transmission chain (73), from the counter shaft (71). A first transmission chain accommodating portion (75) for accommodating the first transmission chain (73), a counter shaft, and a structure for transmitting to the axle (14) of the wheel (5) via the second transmission chain (104) A counter shaft housing portion (76) for housing (71) and a second transmission chain housing portion (77) for housing the second transmission chain (104), the first transmission chain (73) and the first transmission chain (73) Power transmission The second transmission chain (104) and the second transmission chain are positioned on the outer side in the left-right direction with the second transmission chain (104) and the second transmission chain storage (77) positioned on the basis of the shaft housing (75). The walking type rice transplanter according to any one of claims 1 to 3, wherein a wheel (5) is arranged on the outer side in the left-right direction of the housing portion (77).   The center float (12a) levels the planting position of the two seedling planting devices (10) on the left and right inner sides, and the side float (12b) plantes one seedling planting device (10) on each of the left and right outer sides. The walking type rice transplanter according to claim 4, wherein the position is leveled, and a rake (78) for leveling the field is arranged behind the wheel (5).   Left and right side clutches (61) for turning on and off the transmission to the left and right wheels (5) are provided, and the side clutch (61) includes an input side member (63) that rotates about a rotation axis, and an input side member A ball (65) that enters the groove (64) provided in (63), and the input side member (63) rotates through the ball (65) when the ball (65) enters the groove (64). And an output side member (66) that rotates about the rotation axis, and moves the output side member (66) in a direction along the rotation axis to move the ball (65) and the input side member ( 63) or the output side member (66) is cut off, and six balls (65) are arranged at every rotation phase angle of 60 degrees around the rotation axis. The walking type rice transplanter according to claim 5.   A first urging device for urging the rotation about the fulcrum shaft (19) of the relay link member (18) is provided between the cylinder rod (17) and the relay link member (18). The walking type rice transplanter according to any one of claims 1 to 6.   The left and right connecting rods (20) are configured to be extendable / contractable by the respective expansion / contraction portions, and the expansion / contraction portions are provided with a second urging device for urging expansion / contraction, and the linking rod (20) is provided by the first urging device. The walking type rice transplanter according to claim 7, wherein the urging force for urging the connecting rod (20) by the second urging device is smaller than the urging force for urging.   The walking type rice transplanter according to any one of claims 1 to 8, further comprising a support (86) that supports the left and right intermediate portions of the elastic member (80) so as not to move back and forth.

Images