JP2010035514A - Farm implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple structure riding type farm implement having a monocyclic driving wheel, which can ensure straightness on works and can improve steering performance. <P>SOLUTION: The riding type paddy field furrow opener comprises the monocyclic driving wheel, a body frame for supporting the driving wheel, and a furrow opening blade 40 disposed on the body frame. The furrow opening blade 40 has an upper attaching member 49 fixed to the body frame, and a lower attaching member 48 fixed to the upper side of the front end portion of the furrow opening blade 40. The lower attaching member 48 is attached to the upper attaching member 49 in a state capable of being axially freely moved and rotated in the longitudinal travel direction. By the biasing forces of coil springs 57, 57, movements from a neutral position in a state that the upper attaching member 49 and the lower attaching member 48 are approximately arranged within a plane are limited. When the lower attaching member 48 is moved from the neutral position, the biasing forces of the coil springs 57, 57 act to return the lower attaching member 48 to the neutral position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a riding or walking type farm working machine such as a paddy grooving machine, paddy field plowing weeding machine, or paddy fertilizing machine.

Conventionally, as a riding type agricultural working machine, a single riding type paddy field grooving machine is known. In this riding type paddy grooving machine, an engine and a speed reducer are respectively attached to a rear end portion and a front end portion of a transmission shaft pipe (main body frame) extending in the front-rear direction. The rotational power of the engine is transmitted to the speed reducer via the transmission shaft in the transmission shaft pipe. One driving wheel is attached to the output shaft of the speed reducer. A riding part (saddle) and a groove cutting blade (a groove cutting plate, a groove cutting body, a bite plate) are attached to the transmission shaft pipe via a stay. The riding section is provided obliquely upward and rearward of the center of the driving wheel, and the grooving blade is provided obliquely downward and rearward of the riding section.
Therefore, the riding paddy grooving machine is supported by the front driving wheel and the rear grooving blade with respect to the ground (paddy field).

  And, in order to perform grooving in a field such as paddy fields using this riding type paddy grooving machine, an operator rides over the riding section and rotates the driving wheel by the rotational driving force of the engine. The grooving machine is advanced by driving wheels. Then, since the operator's weight is supported by the driving wheel and the grooving blade, the grooving blade is pressurized, the grooving blade is held at a predetermined depth, and the grooving machine advances.

In addition, as described above, as a device for grooving in paddy fields, a frame that supports a plurality of grooving blades arranged side by side through an elevator is attached to the rear part of a four-wheel farm work machine such as a riding rice transplanter. Those are known (for example, see Patent Documents 1 and 2).
A machine using such a four-wheel farm work machine is inevitably expensive as a whole. In addition, a four-wheeled rice transplanter can relatively straighten the paddy field and can finely adjust the course by steering, but it may tilt forward, backward, left and right to some extent depending on the situation of the paddy field.

Therefore, when the frame is fixedly attached to the rice transplanter, or when the grooving blade is fixedly attached to the fixedly attached frame, the depth of the groove dug by the grooving blade is determined by the left and right grooving blades. May be different. Further, by providing a plurality of grooving blades, in a state where the grooving blades are arranged in the paddy field, it is difficult to turn the rice transplanter left and right due to the resistance received by the grooving blades in the paddy field.
Therefore, in Patent Document 1, a frame that supports the grooving blade is connected to the rice transplanter via an elastic mechanism so as to be able to roll to the left and right, and when a force greater than the urging force of the elastic mechanism acts on the frame, Rolling to the left or right is such that the depth of the grooves formed by the groove cutting blades provided on the left and right of the frame is substantially the same on the left and right.

In this case, if the rice transplanter tilts and the frame also tilts, a resistance force (reaction force, etc.) from the paddy field acts on the frame via the groove cutting blade, and the frame tilts against the tilted rice transplanter. As described above, it is possible to dig a groove having the same depth on the left and right.
In Patent Document 2, the tip of the grooving blade is connected to a frame so as to be rotatable about an axis substantially in the vertical direction, and the direction of the rice transplanter can be easily changed with the grooving blade lowered. It is said. That is, the direction change of the traveling machine body is prevented from being hindered by the groove cutting blades forming grooves in the paddy field.

Japanese Patent No. 3075672 Japanese Patent No. 3444960

  By the way, in the grooving machine provided with the frame attached to the traveling machine body such as the four-wheeled riding rice transplanter as described above, in order to form a groove of a stable depth with respect to the traveling machine body, the situation of the paddy field In addition, a mechanism for moving the frame up and down in accordance with the posture of the traveling machine body, etc. is required, and further, a mechanism for making the same depth with the left and right groove cutting blades as described above, and traveling of the traveling machine body are impaired. Therefore, a mechanism for preventing the above is required, and the structure is complicated and the cost is increased.

  On the other hand, in an agricultural machine having only one drive wheel, the cost can be reduced by using an extremely simple structure. For example, when a groove is formed in a paddy field, it is only necessary to form a straight groove basically. Therefore, a cost can be further reduced by adopting a configuration without a steering function.

However, in such a single farm work machine, bending stress may act on the farm work machine when the load on the farm work machine fluctuates due to the situation of the paddy field (field) at the time of grooving. In this case, there is a case where a deviation occurs between the direction of the single driving wheel that supports the agricultural machine and the direction of the grooving machine, and the straightness of the agricultural machine may be impaired.
In addition, since the structure is simple in order to reduce costs, there is no steering device, and it is difficult to finely adjust a slight shift in the traveling direction.

  The present invention has been made in view of the above circumstances, and in a riding-type agricultural work machine having a single drive wheel with a simple structure, it ensures straight advanceability and easily adjusts a slight shift in the traveling direction. An object of the present invention is to provide a riding farm machine that can be used.

  In order to achieve the object, the agricultural machine according to claim 1 includes a single drive wheel (4), a working unit (40) disposed on the ground side, the drive wheel (4), and A main body (10) connected to the working unit (40), and in a farm work machine supported by the driving wheel and the working unit, the working unit (40) is connected to the main body (10). It is provided with elastic means (57, 68) which is provided so as to be movable within a predetermined range and urges the working portion (40) to return to the neutral position when it moves from the neutral position.

  In the first aspect of the present invention, for example, since the working part (40) such as the grooving blade (40) is movably provided within a predetermined range with respect to the main body part (10), the agricultural working machine is externally provided. When the force is applied, the working part (40) of the driving wheel (4) and the working part (40) for supporting the agricultural machine in the paddy field can be moved (including changing the angle). The external driving force is absorbed by the part to prevent bending stress from being applied to the whole farming machine, and when the external force is applied, the grooving blade (40) side moves to drive wheels. By preventing the direction of the gear from being deviated, it is possible to ensure straightness.

  In addition, since the driving wheel (4) and the working unit (40) are basically supported at two points, it is possible to roughly change the traveling direction by tilting the agricultural working machine in substantially the same manner as a two-wheeled vehicle. However, conventionally, the fixed working part (40) is also tilted. For example, when a groove is formed, there is a problem that the groove is tilted, and the groove cutting blade (40) as the working part (40) is formed. Is in a state where a groove is formed in the mud of paddy fields, that is, a state in which a large resistance is applied, it is difficult to tilt the groove cutting blade (40) to a preferred angle, and the agricultural machinery is tilted to make a delicate path It was difficult to make changes.

On the other hand, in the present invention, the other parts (the driving wheel (4) and the main body (40)) of the farm work machine can be tilted without tilting the groove cutting blade (40) movable within a predetermined range. Therefore, it is possible to tilt the agricultural machine with a lighter force than when the grooving blade (40) is fixed, and fine adjustment of the traveling direction is possible. Moreover, when it inclines, it can prevent that a groove shape distorts because a groove cutting blade (40) inclines.
The working part (40) moved (tilted) relative to the main body part (10) by an external force is returned to the neutral position by the elastic means, and the elastic means (57, 68) is attached. It is possible to prevent a simple movement with a force less than the power. The movement within the predetermined range includes rotational movement and swinging. For example, if the main body (10) and the working part (40) are connected by a member that can be easily elastically deformed, It can swing left and right and up and down (including rotational movement), and can also move substantially in parallel.

  However, since it is difficult to support only with an elastic member in terms of strength, the direction of movement including swing is limited by using a combination of an elastic member and a rigid member for supporting the working unit (40). Are also included in the present invention. Further, in the combination of the elastic member and the rigid member, the elastic member may be the elastic means (57, 68) of the present invention.

  The riding type agricultural working machine according to claim 2 is the invention according to claim 1, wherein the working part (40) is attached to the main body part (10) so as to be rotatable about an axis substantially along the front-rear direction. A spring (57) is provided as the elastic means (57) for urging the working unit (40) rotated and moved from the neutral position in a direction to return to the neutral position. To do.

  In the invention according to claim 2, the working portion (40) is rotatable so as to be tilted to the left and right around an axis substantially along the front-rear direction, and the spring (57) as the elastic means (57). The work part that is tilted can be returned to its original neutral position, and as described above, the straight running stability is improved based on the prevention of the deviation in the traveling direction due to external stress, and the part excluding the work part (40) Fine adjustment of the traveling direction by tilting can be made possible.

  The riding-type agricultural work machine according to claim 3 is swingable by attaching the work part (40) to the main body part (10) via an elastic rubber (68) in the invention according to claim 1. The elastic rubber (68), as the elastic means (68), urges the working portion (40) swung from the neutral position in a direction to return to the neutral position.

  In the invention according to claim 3, since the working part is connected to the main body part through the elastic rubber (68), the working part can be moved by elastic deformation of the elastic rubber (68). When the working portion is swung by the elastic force of the elastic rubber (68), it can be returned to the original neutral position. Thereby, as described above, it is possible to improve the straight running stability based on the prevention of the deviation in the traveling direction due to the stress from the outside and to finely adjust the traveling direction by tilting the portion excluding the working portion. In terms of strength, it is preferable to limit the movement range using a member having rigidity higher than that of the elastic rubber (68).

  According to the riding type farm working machine of the present invention, the farm working machine travels by one driving wheel and is supported by the driving wheel and the working part, and the working part is movable to the main body part within a predetermined range. In addition, by allowing the elastic means to return to the neutral position, even in a situation where bending stress is applied depending on the situation of the field, this can be relaxed and the straightness can be improved. Further, by tilting other portions with respect to the swingable working portion, fine adjustment in the traveling direction can be facilitated.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
1 to 5 are views showing a riding paddy grooving machine according to a first embodiment of the present invention, in which FIG. 1 is a side view and FIG. 2 is a grooving blade as a main part. 3 is a plan view, FIG. 3 is a side view of a grooving blade as a main part, FIG. 4 is a rear view of the grooving blade as a main part, and FIG. 5 is a cross-sectional view taken along arrow AA in FIG. .

  This riding-type paddy grooving machine (riding-type agricultural working machine) includes a transmission shaft pipe 1 that is slightly higher on the rear side and extends obliquely in the front-rear direction. An engine (prime mover) 2 and a speed reducer 3 are attached to the rear end portion and the front end portion of the transmission shaft pipe 1, respectively. The rotational power of the engine 2 is transmitted to the speed reducer 3 via a transmission shaft (not shown) in the transmission shaft pipe 1. An output shaft (drive shaft) 3a of the speed reducer 3 projects horizontally from the case of the speed reducer 3 to the right in the traveling direction (right side when viewed from the rear side). The output shaft (axle) 3a includes a driving wheel. One 4 is attached. This driving wheel 4 is rotationally driven by the rotational power from the engine 2 that is decelerated and transmitted via the speed reducer 3.

  A front pipe 11 is attached to the upper portion of the speed reducer 3 and extends slightly diagonally backward toward the upper side. Further, in the vicinity of the rear end portion of the transmission shaft pipe 1, an intermediate pipe 14 and a rear pipe 15 are attached that extend obliquely forward and substantially vertically at an angle of approximately 45 degrees toward the upper side. That is, the lower ends of the middle pipe 14 and the rear pipe 15 are fixed to the upper side in the vicinity of the rear end of the transmission shaft pipe 1 by welding. The upper end portion of the middle pipe 14 is fixed to the vicinity of the upper end portion of the front pipe 11 by welding.

  Further, a lower pipe 16 extending obliquely rearward toward the lower side is attached in the vicinity of the rear end portion of the transmission shaft pipe 1. That is, the upper end portion of the lower pipe 16 is fixed to the lower side near the rear end portion of the transmission shaft pipe 1 by welding. The transmission shaft pipe 1, the front pipe 11, the middle pipe 14, the rear pipe 15, and the lower pipe 16 constitute a main body frame (main body portion) 10 made of pipes. The main body frame 10 has a frame structure that extends vertically in the front-rear direction. A reinforcing plate 17 is fixed to the lower side of the transmission shaft pipe 1 and the lower pipe 16 by welding.

  A riding part (saddle) 20 is attached to the upper side of the main body frame 10 as follows. That is, a plate-like square frame 21 is fixed to the upper end portions of the front pipe 11 and the rear pipe 15 of the main body frame 10, while two lower portions on the front side and a rear central portion 1 are provided on the lower portion of the riding portion 20. A mounting plate 22 extending downward is fixed to the location, and these mounting plates 22 are fixed to the front left and right and rear central portions of the square frame 21 by bolts 23, respectively. A plurality of mounting holes 24 are formed in the mounting plate 22 at intervals in the vertical direction, and the mounting height of the riding section 20 is changed by selecting the position of the mounting hole 24 into which the bolt 23 is inserted. Can be done.

  The rectangular frame 21 is fixed to the upper ends of the front pipe 11 and the rear pipe 15 of the main body frame 10 on the left side in the traveling direction (left side when viewed from the rear side), and is horizontally fixed to the upper ends of the front pipe 11 and the rear pipe 15. The frame 21 protrudes horizontally to the right in the traveling direction from the main body frame 10 extending vertically along the front-rear direction, so that the center in the left-right direction of the riding portion 20 is slightly to the right from the center in the left-right direction of the driving wheel 4. positioned. The riding section 20 is located obliquely above and behind the driving wheel 4.

  A handle 30 made of a pipe extending horizontally from side to side is attached to the riding section 20 at a position above the front of the riding section 20 as follows. That is, a handle support member 31 made of a pipe that extends in the front-rear direction at the lower part of the riding part 20 and extends slightly obliquely forward toward the upper side at the front side of the riding part 20 is fixed to the lower central part of the riding part 20. A support fitting 32 is fixed near the upper end of the handle support member 31, and the handle 30 is fixed to the support fitting 32.

  A throttle lever (not shown) is attached to the handle 30, and the throttle opening of the engine 2, that is, the output of the engine 2 is adjusted by this throttle lever. Further, a stop switch (not shown) is attached to the handle 30, and the current flow to the ignition plug of the engine 2 is short-circuited by the stop switch, and the driving of the engine 2 is stopped.

  Further, a handle member 34 for lifting and moving is attached to the riding section 20. The handle member 34 is made of a pipe and is formed in a flat U-shape. The gripping paddy grooving machine can be lifted and transported by gripping both ends with both hands. .

  A plurality of lugs 51 are fixed to the driving wheel 4. The driving wheel 4 includes an outer ring to which the lug 51 is fixed, a cylindrical hub to which the output shaft 3a of the speed reducer 3 is fixed, and a plurality of spokes that connect the outer ring and the hub. . Further, the driving wheel 4 is provided with a plate-like protective member 56 that prevents the operator's leg from being caught in the space formed by the outer ring, the hub, and the plurality of spokes. The protective member 56 is attached to the driving wheel 4 so as to close most of the space except the cross-shaped space at the center.

In addition, a groove cutting blade (working unit) 40 is provided obliquely below and behind the boarding unit 20. That is, the groove cutting blade 40 is attached to the lower end portion of the lower pipe 16 that extends obliquely rearward toward the lower side so as to be rotatable about an axis substantially along the front-rear direction as will be described later.
The grooving blade 40 as a working portion has a substantially bilaterally symmetric structure in an arbitrary cross section, and left and right side plate portions 41 and 41 for forming a side surface of a substantially V-shaped paddy field groove, and a side plate Left and right projecting plate portions 42, 42 projecting outward in the left-right direction from the upper ends of the portions 41, 41, and left and right bottom plate portions provided at the bottom of the rear end portion of the groove cutting blade 40 and forming the bottom surface of the groove 43, 43. Each of the left and right side plate portions 41 and 41, the overhang plate portions 42 and 42, and the bottom plate portions 43 and 43 is formed by bending a single metal plate made of aluminum alloy, stainless steel, steel plate, or the like.

  Each of the left and right side plate portions 41, 41 is formed so that the dimension in the height direction becomes shorter toward the front side, and the lower end portions so that these both side plate portions 41, 41 are substantially V-shaped in cross section. Most of them are abutted, and are arranged diagonally with the front side facing up. Of the lower end portions of both side plate portions 41, 41, the portion that is abutted excluding the rear portion is overlapped and joined with a certain narrow dimension, and thereby the joint that extends obliquely so that the front side is on top A portion 45 is formed.

  The left and right bottom plate portions 43, 43 are provided only at the rear end portions of the lower ends of the left and right side plate portions 41, 41. That is, a substantially triangular space extending toward the rear side is formed on the rear side of the joint portion 45 at the lower end portion of the both side plate portions 41, 41, and is respectively formed from the lower ends of the left and right side plate portions 43, 43. Each of the bottom plate portions 43 and 43 protrudes toward the left and right inward and is located in this space. Each of the bottom plate portions 43, 43 is formed in a substantially triangular shape that widens toward the rear side (however, the opposite corners on the rear side are formed in a round shape), and is positioned slightly above the rear side. To be a little inclined. A gap 46 is provided between the bottom plate portions 43 and 43.

  The left and right overhanging plate portions 42 and 42 are widened toward the rear side, and the front end portions of the both overhanging plate portions 42 and 42 are welded to the left and right overhanging plate portions 42 and 42 at the left end portion or the right end portion. It is connected by two plate-like connecting members 47 and 47 fixed by the above. Of these connecting members 47, 47, the left connecting member 47 has the left end fixed to the left overhanging plate portion 42 as described above, and the right end bent from a substantially horizontal state to a vertical state. Is formed.

The right connecting member 47 is formed such that the right end is fixed to the right overhanging plate portion 42 as described above, and the left end is bent from a substantially horizontal state to a vertical state. The right end portion of the left connecting member 47 and the left end portion of the right connecting member 47 are disposed substantially in parallel, and are joined together with a below-described lower mounting member 48 interposed therebetween.
The connecting member 47 and the lower mounting member 48 joined to the left and right projecting plate portions 42, 42 by the connecting member 47 are one of mounting structures for mounting the groove cutting blade 40 to the lower pipe 16 as will be described later. Part.

  The rear end portions of both projecting plate portions 42 and 42 are connected by a turnbuckle 50. The turnbuckle 50 is positioned above the gap 46 between the bottom plate portions 43, 43, and the operator can adjust the length of the turnbuckle 50 to adjust the dimension of the gap 46, that is, the front-rear direction. The distance between the left and right projecting plate portions 42, 42 at the position of the turnbuckle 50 can be adjusted.

As described above, the groove cutting blade 40 is attached to the lower pipe 16 of the main body frame 10 at the position of the connecting member 47 described above.
At this time, a substantially U-shaped support member 61 is attached to the lower pipe 16. The support member 61 is disposed in a state separated from the lower pipe 16 on the right side in the traveling direction of the lower pipe 16. The support member 61 is formed in a rectangular plate shape that extends long in the direction along the lower pipe 16, and has a flat plate shape along a substantially vertical direction. And the junction part which goes to the lower pipe 16 is formed in the front-and-rear both-ends part (the front-and-rear end part along the lower pipe 16) of the support member 61, and the front-end | tip part of the said junction part becomes the lower pipe 16 The support member 61 is fixed to the lower pipe 16 by welding.

Further, the support member 61 is formed with a bolt hole through which two bolts are inserted while being spaced apart along the length direction.
The groove cutting blade 40 includes an upper mounting member 49 that is fixed to the support member 61 and the lower mounting member 48 that is rotatably connected to the upper mounting member 49.
The upper mounting member 49 has a shape corresponding to the support member 61 whose upper portion is inclined downward from front to back along the lower pipe 16 as described above. Bolt holes 62 and 62 for inserting two bolts in a state where the upper side is formed so as to be inclined downward from the front to the rear along the longitudinal direction and spaced apart along the downward inclined upper side. Is formed.

The upper mounting member 49 is fastened to the support member 61 by a bolt that penetrates the bolt hole 62. Accordingly, the upper mounting member 49 is in a state parallel to the traveling direction and along the vertical direction.
The lower side of the upper mounting member 49 is substantially horizontal, and two cylindrical portions 52, 52 are formed on the same axis and spaced apart from each other. That is, two cylindrical portions 52 and 52 are provided at the lower end portion of the upper mounting member 49.
Moreover, the axial direction of the cylinder parts 52 and 52 is a thing along the advancing direction of a riding-type paddy field grooving machine, ie, along the front-back direction of a riding-type paddy field grooving machine.

Further, the length of the cylindrical portions 52, 52 along the axial direction is slightly shorter than the interval between the cylindrical portions 52, 52.
The cylindrical portions 52, 52 are formed by integrally providing two extending portions in a band shape at the lower portion of the upper mounting member 49, and rounding the band-shaped extending portions into a cylindrical shape.
One lower mounting member 48 has its upper and lower central portions fixed to the grooving blade 40 via the connecting members 47 and 47 as described above, and along the traveling direction (front-rear direction) of the riding paddy grooving machine. , Along the vertical direction. In addition, the lower end part of the lower attachment member 48 is in a state of extending below the end part facing downward below the end part fixed to the projecting plate parts 42, 42 of the connecting members 47, 47. Yes.

And the lower attachment member 48 fixed to the grooving blade 40 has two cylindrical portions 53, 53 formed on the upper end portion thereof in the same coaxial manner as the upper attachment member 49 with a space therebetween. The cylindrical portions 53 and 53 are substantially the same size as the cylindrical portions 52 and 52 of the upper mounting member 49, and the interval between the two cylindrical portions 53 and 53 is the same as that of the upper mounting member 49.
And the axial direction of the cylinder parts 52 and 52 shall be along the advancing direction of a riding-type paddy field grooving machine, ie, along the front-back direction of a riding-type paddy field grooving machine.

Then, a front cylindrical portion 53 of the lower mounting member 48 is disposed between the two lower cylindrical portions 52, 52 of the upper mounting member 49, and between the two cylindrical portions 53, 53 of the lower mounting member 48. In a state where the rear cylinder portion 52 is arranged, the four cylinder portions 52 and 53 are arranged coaxially.
Then, by inserting a single round bar-like core material (rotating shaft) so as to be inserted through all of the cylindrical portions 52 and 53, the cylindrical portions 52 and 53 are joined to each other in a freely rotatable manner. Become.

  Accordingly, the lower mounting member 48 to which the groove cutting blade 40 is fixed is inserted into the cylindrical portions 52 and 52 and the cylindrical portions 53 and 53 with respect to the upper mounting member 49 fixed to the lower pipe 16 of the main body frame 10. The core material can be rotated freely. The rotation axis at this time is along the front-rear direction of the riding paddy drainer, and the grooving blade 40 can rotate about the axis along the front-rear direction. In addition, it is good also as what fixes one side of the cylinder parts 52 and 52 and the cylinder parts 53 and 53 to a core material, and the other freely rotates with respect to a core material.

  Angle members 54 and 54 are fixed to the left and right side surfaces of the upper mounting member 49, respectively. The angle members 54, 54 are plate bodies having a shape in which the other plate portion is bent and joined to one plate portion at a right angle, and the one plate portion is placed on the side surface of the upper mounting member 48 with the one plate portion facing upward. The other plate portion is welded and extends to the left or right at a right angle to the upper mounting member 49 and substantially horizontally.

Further, the mounting positions of the left and right angle members 54, 54 with respect to the upper mounting member 49 are the same except that the side surfaces of the upper mounting member 49 to be mounted are different on the left and right, and the mounting positions in the front-rear direction and the vertical direction are the same. It has become.
Further, an insertion hole through which a bolt is inserted is formed in the plate portion extending to the left or right of the angle members 54, 54.

  On the other hand, bolts 55, 55 are joined to the left and right connecting members 47, 47 at right angles to the substantially horizontal upper surface of the connecting members 47, 47, and the upper ends of the bolts 55, 55 are angle members 54, 54. The upper ends of the bolts 55 and 55 are projected above the horizontal plate portions of the angle members 54 and 54. Further, the inner diameters of the insertion holes of the angle members 54, 54 are slightly larger than the outer diameters of the bolts 55, 55, and the connecting members 47, 47 are connected to the upper mounting member 49 via the lower mounting member 48. Is allowed to swing within a certain range.

Also, two nuts 58, 58 are screwed onto the upper ends of the bolts 55, 55 above the angle members 54, 54, and the two nuts 58, 58 are in contact with each other. By screwing, the positions of the nuts 58 and 58 relative to the bolts 55 and 55 are fixed.
In addition, when the grooving blade 40 is swung as described later, the angle members 54 and 54 move with respect to the nuts 58 and 58, so the positions of the bolts 55 and 55 need to be fixed. Further, the position of the nuts 58, 58, that is, the tightening amount, considers the relationship with the spring load of the coil springs 57, 57 described later, and how much force the rotational movement of the grooving blade 40 can be performed. Can be decided.

  Further, coil springs (springs) 57 and 57 are arranged on the left and right sides between the angle members 54 and 54 and the connecting members 47 and 47, respectively. Further, the above-described bolts 55 and 55 are inserted into the coil springs 57 and 57. The upper ends of the coil springs 57 and 57 are in contact with the angle members 54 and 54, and the lower ends of the coil springs 57 and 57 are in contact with the connecting members 47 and 47. Note that coil springs 57 and 57 may be joined to at least one of the connecting members 47 and 47 and the angle members 54 and 54.

  Due to the mounting structure of the grooving blade 40, the grooving blade 40 is rotatable and movable about an axis along the front-rear direction with respect to the main body frame 10, that is, swingable. The range of rotational movement of the grooving blade 40 is limited by the interference of the bolts 55 and 55 inserted into the insertion holes formed in the angle members 54 and 54. The limitation on the rotational movement range is to prevent the grooving blade 40 from being excessively inclined with respect to the main body frame 10, and the range is determined to be appropriate for use by, for example, experiments. There is a need.

  The coil spring 57 compresses the right coil spring 57 when the groove cutting blade 40 is tilted to the right, and compresses the left coil spring 57 when the groove cutting blade 40 is bent to the left. The force required for compression becomes a resistance when the groove cutting blade 40 is swung left or right. That is, the coil springs 57, 57 are rotated when the groove cutting blade 40 is rotated from the neutral position, that is, when the lower mounting member 48 and the upper mounting member 49 are substantially parallel. It is necessary to resist the urging power of.

  Further, when the groove cutting blade 40 is rotated to the left or right against the biasing force of the coil springs 57, 57, a force is applied to return the groove cutting blade 40 to the neutral position by the coil springs 57, 57. It will be. As a result, when the force for rotationally moving the groove cutting blade 40 becomes weaker than the urging force of the coil springs 57, 57, the groove cutting blade 40 is in the neutral position by the elastic force (spring force) of the elastically deformed coil springs 57, 57. Will be returned to.

  With this configuration, in this riding type paddy field grooving machine, external force acts on the riding type paddy field grooving machine that moves forward due to mud in the paddy field during grooving work in the paddy field. Even if bending stress is generated, that is, stress displacement occurs and the traveling direction of the riding paddy grooving machine is shifted, the grooving blade 40 is moved in the longitudinal direction of the riding paddy grooving machine ( The grooving blade 40 is rotated with respect to the driving wheel 4 in a state in which the riding paddy grooving machine is pulled by rotating around the axis along the traveling direction) against the urging force of the coil springs 57, 57. It moves in the following direction and acts to improve the straightness of the riding paddy grooving machine.

  In addition, the traveling direction of the riding paddy field grooving machine is finely adjusted based on the fact that the traveling direction of the riding paddy field grooving machine is slightly deviated and the row of planted seedlings deviates from the straight line. In doing so, the parts other than the grooving blade 40 of the riding paddy grooving machine (the driving wheel 4, the main body frame 10, the riding section 20, the main body frame 10, the handle 30, etc.) are inclined with respect to the grooving blade 40. The traveling direction can be finely adjusted by slightly bending the traveling direction.

Inclining the entire riding paddy grooving machine as in the past, that is, only tilting both the driving wheel 4 and the grooving blade 40 at least partially in the paddy field, The tilting can be performed with a small force, and fine adjustment of the traveling direction can be easily performed.
That is, it is possible to improve the steering performance of the riding paddy grooving machine.

  6 and 7 show the mounting structure of the support member 61 of the lower pipe 16 of the main body frame 10 and the grooving blade 40 of the riding type paddy grooving machine (agricultural working machine) according to the second embodiment of the present invention. 6 is a side view, and FIG. 7 is a cross-sectional view of the main part. In the second embodiment, the portions other than the mounting structure of the support member 61 and the groove cutting blade 40 have the same configuration as the first embodiment, and the description of the portions other than the mounting structure is omitted. To do.

  In the grooving blade 40 shown in FIG. 6, the lower mounting member 48, the upper mounting member 49, the angle members 54, 54, the bolts 55, 55, the nuts 58, 58, etc. of the first embodiment are not provided. 40, a mounting member 63 having a plate-like shape in which the lower mounting member 48 and the upper mounting member 49 are fixedly integrated is sandwiched between the connecting members 47 and 47 in the same manner as the lower mounting member 48. It is in a fixed state.

The attachment member 63 is formed in a single plate shape along the traveling direction of the riding paddy grooving machine when the grooving blade 40 is in the neutral position along the vertical direction. Two bolt holes 62 similar to the member 49 are formed.
The mounting structure of the mounting member 63 is not necessarily the same as that of the lower mounting member 48 of the first embodiment. For example, the connecting member 47 is bridged between the two left and right projecting plate portions 42 and 42. One plate body in a state may be used, and the lower end of the mounting member 63 may be welded to the single plate body, or another structure may be employed.

  And the attachment member 63 has the two bolt holes 62 similarly in the part which has the same structure as the upper end part of the upper attachment member 49 of 1st Embodiment which has the two bolt holes 62 and 62, The bolt 65 is fastened to the support member 61. However, in this example, the mounting structure of the support member 61 and the mounting member 63 has a rectangular plate shape similar to the plate-shaped portion excluding the portions bent to the lower pipe 16 side at both ends of the support member 61, and the support member A mounting washer 67 having two bolt holes 64 at the same position as 61, and two elastic rubber plates (elastic rubber) 68 having the same shape as the mounting washer 67 and provided with bolt holes 64, 64, 68 and a cylindrical mounting spacer 69 that is inserted into the bolt hole 62, the bolt hole 64, and a bolt hole 66 described later, and has an insertion hole through which the bolt 65 is inserted.

The support member 61 also has two bolt holes 66 at the same interval as the above-described bolt holes 62 and 64.
In these, the upper end portion of the attachment member 63 is disposed between the plate-like portion of the support member 61 and the attachment washer 67, and between the plate-like portion of the support member 61 and the upper end portion of the attachment member 63. One elastic rubber plate 68 is disposed, and the elastic rubber plate 68 is disposed between the upper end portion of the attachment member 63 and the attachment washer 67. That is, the attachment structure when attaching the attachment member 63 to the support member 61 is the plate-like portion of the support member 61, the elastic rubber plate 68, the upper end of the attachment member 63, the elastic rubber plate 68, and the attachment washer 67 in this order. Have a laminated structure in which are stacked.

As a material of the elastic rubber plate 68, various known synthetic rubbers, natural rubbers, various rubber-like synthetic resins other than so-called synthetic rubbers can be used.
Further, a cylindrical mounting spacer 69 is inserted into the bolt holes 62, 64, 69 of the laminated members so as to penetrate them.
The stacked members are integrally fastened by the bolt 65 inserted into the mounting spacer 69 and the nut 70. The length of the mounting spacer 69 is, for example, slightly shorter than the total thickness of the support member 61, the mounting member 63, the mounting washer 67, and the elastic rubber plate 68. It is in a slightly compressed state.

With this mounting structure, the mounting member 63 of the grooving blade 40 is sandwiched between the two elastic rubber plates 68, and thereby swings so as to compress the left and right elastic rubber plates 68. Is possible.
It is also possible to make a slight translation along the direction of the bolt 65 and the mounting spacer 69. Further, the movement range of the mounting member 63, that is, the grooving blade 40 is basically limited to the support member 61 and the mounting washer 67 disposed on the left and right of the mounting member 63, and the elastic rubber plate 68 is compressed. Since the thickness cannot be zero, it is also limited by the two elastic rubber plates 68.

  Further, the attachment spacer 69 also restricts the movement along the plane direction along the vertical direction as well as along the traveling direction. That is, the movement in the direction perpendicular to the mounting spacer 69 is restricted. The inner diameter of the bolt holes 64 and 64 of the mounting member 63 needs to be slightly larger than the outer diameter of the mounting spacer 69 inserted into the bolt holes 64 and 64, thereby causing the mounting member 63 to swing. It becomes possible.

  Note that the mounting member 63 is basically supported in a state of being sandwiched between two elastic rubber plates 68 and 68, and the elastic rubber plates 68 and 68 supported by the support member 61 and a mounting spacer 69 (bolt 65) and is supported by the main body frame 10 via an elastic rubber.

Further, in the second embodiment, it is possible to swing substantially the same as the rotational movement around the axis along the front-rear direction similar to the first embodiment, and around the axis along the vertical direction. Can be swung.
Basically, it can swing around the axis of a shaft that can be arranged in a plane along the front-rear direction and in the vertical direction, that is, in a plane orthogonal to the bolt 65 and the mounting spacer 69.
With such a configuration, as in the first embodiment, it is possible to improve the straight traveling performance of the riding-type farm work machine and to improve the steering performance.

  Moreover, although the case where this invention was applied to the riding type paddy field grooving machine was demonstrated in the above-mentioned embodiment, this invention is not limited to this, The riding type paddy field plowing weeder or the riding type paddy field fertilizer is also used. Can be applied. In this case, the grooving blade as the working part is replaced with a weeding part or a fertilizing part. Further, the present invention can also be applied to a walking type farm working machine that does not have the above-described boarding portion and performs work in a state where the worker walks and is supported by hand.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the riding type paddy field grooving machine which concerns on embodiment of this invention, Comprising: It is a side view It is a top view which shows the grooving blade of the said riding type paddy grooving machine, and its attachment structure. It is a side view which shows the said groove cutting blade and its attachment structure. It is a front view which shows the said groove cutting blade and its attachment structure. It is AA arrow sectional drawing of FIG. It is a front view which shows the said groove cutting blade and attachment structure of 2nd Embodiment. It is BB arrow sectional drawing of FIG.

Explanation of symbols

4 Driving Wheel 10 Body Frame (Main Body)
40 Groove cutting edge (working part)
57 Coil spring (elastic means, spring)
68 Elastic rubber plate (elastic means, elastic rubber)

Claims (3)

One driving wheel (4), a working unit (40) disposed on the ground side, and a main body (10) connected to the driving wheel (4) and the working unit (40), In the agricultural machine supported by the driving wheel and the working unit,
The working part (40) is provided movably within a predetermined range with respect to the main body part (10),
An agricultural working machine provided with elastic means (57, 68) for urging the working unit (40) in a direction to return to the neutral position when the working unit (40) moves from the neutral position.   The working part (40) is attached to the main body part (10) so as to be rotatable about an axis substantially in the front-rear direction so that the working part can be rotated to the left and right, and the working part rotated from the neutral position is moved to the neutral position. The agricultural working machine according to claim 1, further comprising a spring (57) as the elastic means for urging in a direction to return to the vertical direction.   By attaching the working part (40) to the main body part (10) via an elastic rubber (68), the working part (40) is movable within a predetermined range, and the elastic rubber (68) is moved from the neutral position as the elastic means. The agricultural working machine according to claim 1, wherein the working unit (40) is urged in a direction to return to the neutral position.

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