JP6214456B2 - Paddy field machine - Google Patents

Description

  The present invention relates to a paddy field work machine in which a work device is connected to a traveling machine body so as to be movable up and down, such as a ride type rice transplanter and a ride type direct seeding machine.

  In a rice transplanter as an example of a paddy field work machine, a seedling planting device as a work device is connected via a link mechanism so that it can be driven up and down by a hydraulic cylinder as an actuator, and is provided at the center in the width direction of the seedling planting device. The sensor float is supported so as to be swingable up and down around the rear fulcrum, and the machine is connected to the hydraulic control valve as the control means via the operation member connected to the front portion of the sensor float and the operation wire linked thereto. In some cases, hydraulic cylinders are controlled so that the ground height of the seedling planting device is maintained at a set height. That is, the sensor float functions as a grounding body that can move up and down relatively with respect to the work device, and the operation member and the operation wire constitute an interlocking operation member that links the sensor float and the hydraulic control valve. . And the interlocking operation member was provided in the state which connected the lower end part to the machine float lateral direction center vicinity vicinity of the sensor float, and extended upwards (for example, refer patent document 1).

Japanese Patent Laid-Open No. 2003-284412

  In the above conventional configuration, the lower end portion of the interlocking operation member that links the grounding body (sensor float) and the control means is connected to the vicinity of the center of the grounding body in the lateral direction of the machine body and extends upward. It passes through a narrow portion sandwiched between a pair of left and right lower links in the link mechanism.

  As a result, when performing a work such as assembling the interlocking operation member or a maintenance work such as inspection and repair, there is a disadvantage that the operator's body interferes with the link mechanism and the work becomes difficult.

  Therefore, it is desirable to make it easy to perform assembly work, maintenance work, etc. in the paddy field work machine in which the interlocking operation member provided for controlling the ground height of the work device is interlocked with the grounding body. It was rare.

The characteristic configuration of the paddy field working machine according to the present invention is as follows:
A working device is connected to the rear portion of the traveling machine body through a link mechanism so as to be movable up and down, an actuator that can drive the working device up and down, a control unit that controls the actuator, and a central part of the working device in the lateral direction of the machine body. A grounding body that is positioned and follows the grounding device and is movable up and down relatively with respect to the work device, and is linked to the grounding body and extends upward from a link point to the grounding body and linked to the control means. An interlocking operation member,
Together with the interlock operation member and the ground member are connected to each other via the relay member along the vehicle body width direction, the one end side in the vehicle body width direction of the relay member with the machine body lateral width direction on one side outside of the link mechanism The other end side of the relay member in the lateral width direction of the relay member is connected to the interlocking operation member, and is connected to the grounding body at the center position in the lateral width direction of the grounding body .

  According to the present invention, the grounding body and the control means are interlocked and linked via the interlocking operation member that is linked and linked to the grounding body and extends upward from the link location with respect to the grounding body, and is controlled based on the relative vertical movement of the grounding body. The actuator is controlled by the means. And since the interlocking operation member is provided on the outer side in the body width direction of the link mechanism, the interlocking operation member can be deployed in a state where the interval between the link operation member and the member constituting the link mechanism is widened.

  In other words, if the link mechanism is provided with a plurality of link members that are spaced apart in the lateral direction, one of the plurality of link members in the lateral direction of the body further than the link member located at one end of the lateral direction of the lateral direction of the body. The interlocking operation member will be provided in a state located on the outside of the side, and the gap between the link mechanism and the member constituting the link mechanism is widened in a widely open part on the one side outside in the width direction of the fuselage. It becomes possible to deploy the interlocking operation member in the state.

  As a result, the interval between the interlocking operation member and the member constituting the link mechanism is widened, so that when the assembling work or the maintenance work is performed, the operator's body interferes with the link mechanism and it is difficult to perform those work. Such disadvantages can be avoided.

  Therefore, in the paddy field work machine in which the interlocking operation member provided for controlling the height of the working device with respect to the ground is linked to the grounding body, the assembly work and the maintenance work can be easily performed.

  In the present invention, it is preferable that the interlocking operation member is provided on the outer side in the lateral direction of the fuselage of the grounding body.

  According to this configuration, the interlocking operation member is provided at a position closer to the outer side in the body width direction than the one end portion in the body width direction of the grounding body. By shifting the position of the interlocking operation member along the lateral width direction of the aircraft in this way, power is transmitted from the various members located on the center side of the lateral width direction of the aircraft, for example, the members constituting the link mechanism or the working body side to the work device. Therefore, the interlocking operation member is less likely to interfere with members and the like constituting the transmission mechanism.

  Therefore, it is possible to make assembly work and maintenance work easier.

  In the present invention, a fertilizer supplying device for supplying fertilizer to the field is provided at the rear of the traveling machine body, and a transmission mechanism for transmitting engine power to the fertilizer apparatus is provided on the outer side in the lateral width direction of the link mechanism. Preferably.

  According to this configuration, the power of the engine is transmitted to the fertilizer through the transmission mechanism, and fertilizer is supplied to the field by the fertilizer. And since the transmission mechanism for transmitting motive power to a fertilizer application apparatus is provided in the body width direction other side outer side of a link mechanism, it arrange | positions in the state which made the space | interval between the members which comprise a link mechanism wide. be able to.

  As a result, the transmission mechanism and the link mechanism are less likely to come into contact with each other, and assembly work and maintenance work can be easily performed.

  In the present invention, the working device is provided with a leveling float extending over substantially the entire width in the horizontal width direction, the leveling float including a front overhanging portion on the center side in the horizontal width direction as the grounding body and a rear side of the front overhanging portion. It is preferable that the float main body portion located at a position extending in the horizontal width direction of the working device is integrally formed.

  According to this configuration, the ground leveling float is integrally formed with the front projecting portion that projects forward from the center in the lateral width direction of the float main body portion that extends over substantially the entire width of the working device. That is, since it is configured by one leveling float, the configuration can be simplified as compared with the configuration including a plurality of leveling floats arranged side by side.

  Further, since the leveling float is integrally formed over substantially the entire width in the width direction, even in a soft field, only a part of the width direction sinks greatly, and there is little possibility that the left and right tilt posture will fluctuate greatly. It becomes easy to maintain the ground parallel posture. As a result, even if the interlocking operation member is provided on the outer side in the lateral direction of the body of the forward projecting portion that functions as a grounding body, it is possible to accurately detect the vertical movement displacement relative to the work device. .

  Therefore, the ground posture of the working device is stable and the paddy field work can be performed satisfactorily, and the lifting / lowering control of the working device associated with the vertical movement of the forward projecting portion can be performed satisfactorily.

It is the whole rice transplanter side view. It is a whole top view of a rice transplanter. It is a top view which shows the transmission mechanism of a fertilizer application, and the support structure of a seedling planting apparatus. It is a side view which shows the arrangement | positioning state of a leveling float and an interlocking operation member. It is a top view which shows the arrangement | positioning state of a leveling float and an interlocking operation member. It is a bottom view of a leveling float.

  Hereinafter, the case where the embodiment of the present invention is applied to a riding type rice transplanter as an example of a paddy field working machine will be described based on the drawings.

  As shown in FIGS. 1 and 2, the rice transplanter is linked to the rear portion of a four-wheel drive type traveling machine body 3 having a steerable front wheel 1 and a non-steerable rear wheel 2 by a driving force of a hydraulic cylinder 4. A seedling planting device 6 is connected via a mechanism 5 so as to be movable up and down. Further, the traveling machine body 3 is provided with a driving part 8, a driving part 9, a spare seedling stand 10, etc., which are located in the bonnet 7, and the driving part 9 is provided with a driving seat 11, and a handle post 12 is provided in front of it. And a steering handle 13 is provided on the upper portion of the handle post 12. Further, a fertilizer application device 14 is provided in the rear part of the traveling machine body 3 on the rear side of the driver seat 11.

  A mission case 15 is provided at the lower part of the front side of the traveling machine body 3 and is operated around the longitudinal axis at the end of the front axle case 16 projecting sideways from the left and right sides of the front side of the mission case 15. The front wheel 1 is supported so as to be turnable. A pair of left and right swing cases 18 elastically supported by a suspension mechanism 17 are mounted on the rear part of the transmission case 15 so as to be able to swing up and down independently around a fulcrum a. Are pivotally supported. Further, the prime mover 8 accommodated in the bonnet 7 is provided with an engine 20 mounted on a front frame 19 projecting forward from the mission case 15.

  A hydrostatic continuously variable transmission (HST) 21 is connected to the side surface of the mission case 15, and the power of the engine 20 is shifted by the continuously variable transmission 21, and the shift output is transmitted to the mission case 15. The Although not shown, the power transmitted to the mission case 15 is branched into the traveling transmission system and the planting transmission system, transmitted to the front and rear wheels 1 and 2, and transmitted to the seedling planting device 6.

  The link mechanism 5 is configured in a parallel quadruple link structure including a top link 5a and a lower link 5b in a parallel posture. That is, the front end of one top link 5a is pivotally connected to the upper part of the front vertical link 5c so as to be swingable around the horizontal axis, and the front ends of the pair of left and right lower links 5b are front vertical. The lower part of the link 5c is pivotally connected so as to be swingable around the horizontal axis. The rear end of the top link 5a is pivotally connected to the upper part of the rear vertical link 5d in the vertical orientation so as to be swingable around the horizontal axis, and the rear ends of the pair of lower links 5b are rear vertical links. It is pivotally connected to the lower part of 5d so as to be swingable around the horizontal axis. One end of the hydraulic cylinder 4 is pivotally connected to the upper portion of the front vertical link 5c so as to be swingable around the horizontal axis, and the other end of the hydraulic cylinder 4 is connected to the lower portion of the rear vertical link 5d. It is pivotally connected so that it can swing around the core.

  The fertilizer application device 14 feeds the granular fertilizer stored in the fertilizer hopper 22 by a set amount by a feeding mechanism 23 provided at the lower end portion of the hopper, and feeds the fed fertilizer with four supply hoses by the conveying air from the electric blower 24. The fertilizer grooves formed on the rice field near the lateral side of the planted seedlings by the grooving device 27 are fed to the grooving devices 27 attached to the leveling float 26 provided in the seedling planting device 6. It is configured to fill with fertilizer.

  The fertilizer application 14 has a configuration in which power is transmitted through an operation rod 29 (an example of a transmission mechanism) that extends in the front-rear direction from a rotary shaft 28 that protrudes laterally from the front-rear intermediate portion of the mission case 15 and a feeding operation is performed. It has become. That is, as shown in FIG. 3, the driven shaft 30 is supported on the rear side of the feeding mechanism 23 so as to be rotatable. A crank arm 31 attached to the rotary shaft 28 and a swing arm 32 attached to the driven shaft 30 are pivotally connected via an operation rod 29. The operation rod 29 reciprocates with the rotation of the rotation shaft 28, and the driven shaft 30 is driven to reciprocate.

  The driven shaft 30 extends from the position where it is linked to the operating rod 29 to the right end, and the reciprocating rotational power of the driven shaft 30 is transmitted to the adjustment mechanism 33 located at the right end of the fertilizer application device 14. Although not described in detail, the adjusting mechanism 33 is provided with an operating amount adjusting means (not shown) that adjusts the operating stroke of the input reciprocating rotational power so that the amount of fertilizer fed can be adjusted. ing. The power adjusted by the adjusting mechanism 33 is transmitted to a feeding drive shaft 34 provided near the feeding mechanism 23 via a one-way clutch (not shown), and the power of the feeding drive shaft 34 is supplied to the feeding mechanism. The fertilizer stored in the fertilizer hopper 22 is fed out by a set amount.

  Therefore, the operation rod 29 extending rearward and upward from the lateral side portion of the front and rear intermediate portion of the mission case 15 functions as a transmission mechanism that transmits the power of the engine 20 to the fertilizer 14, and as shown in FIG. The operation rod 29 is provided on the left outer side of the link mechanism 5 (an example of the outer side on the other side in the body width direction). In other words, the pair of left and right lower links 5b and 5b are provided in a state of being located at a location spaced outwardly from the left side of the left side lower link 5b.

  As shown in FIG. 3, the seedling planting device 6 includes a rectangular tube-shaped main frame 35 extending in the width direction, a feed case 36 connected to the middle portion of the main frame 35 in the width direction, and a main frame 35. A pair of left and right planting transmission cases 37 that are connected and extend rearward constitute a frame that supports the entire seedling planting device 6. A seedling platform 38 on which a seedling is placed and is capable of reciprocating horizontally by a fixed stroke is supported by the frame, and is positioned on both left and right sides of the pair of left and right planting transmission cases 37. Four sets of rotary planting mechanisms 39 for cutting out seedlings one by one from the lower end of the platform 38 and planting the seedlings on the rice field are configured in a four-row planting specification. Further, a leveling float 26 is provided at the bottom of the seedling planting device 6 for leveling the planting location on the rice field.

  As shown in FIG. 3, a feed case 36 is connected to the lower end portion of the rear-side vertical link 5d via a support shaft (not shown) so as to be rotatable around the longitudinal axis X. As described above, the feed case 36 is integrally connected to the main frame 35 to form a frame, so that the entire seedling planting device 6 is supported by the link mechanism 5 so as to be swingable around the longitudinal axis X. Will be. Although not described in detail, the seedling planting device 6 is urged to return to a neutral posture from a left-right inclined posture by balance springs (not shown) stretched on both left and right sides.

  As shown in FIGS. 5 and 6, the leveling float 26 is provided over substantially the entire width in the lateral width direction of the seedling planting device 6, has a lateral width corresponding to the planting width corresponding to the total number of planting strips, and is horizontally long. A rectangular float main body 26A, a front overhang 26B extending forward from the left and right center position of the float main body 26A, and a pair of left and right extending rearward from two left and right directions of the float main body 26A The rear overhanging portion 26C. Thus, the leveling float 26 including the float main body 26A, the front overhanging portion 26B, and the rear overhanging portion 26C is integrally formed of a synthetic resin material by blow molding.

  The front projecting portion 26B projects from the left and right center position of the front end of the float main body portion 26A toward the front, and has a function as a sensor float used for elevation control as will be described later. The pair of left and right rear projecting portions 26C are provided so as to be located on the rear side of the left and right front wheels 1 and the rear wheels 2, respectively, and the front wheels 1 and the rear wheels 2 so as to level the passage marks of the front wheels 1 and the rear wheels 2. It is formed wider than the lug width of the wheel 2.

  Further, as shown in FIG. 6, a mud intake recess 41 is formed at the center of the bottom surface of the leveling float 26 in the lateral width direction from the bottom surface of the front overhanging portion 26B to the bottom surface of the float main body portion 26A. The mud intake recessed portion 41 is formed in a state extending from the front end position of the front overhang portion 26B to the vicinity of the rear end portion of the float main body portion 26A, while maintaining a substantially constant recessed depth along the curved state of the bottom surface. The front side is wide and the lateral width is gradually narrowed so as to be continuous with the rear side.

  Since such a mud intake recessed portion 41 is formed, mud soil from the front can be guided into the mud intake recessed portion 41 to flow backward during traveling on the field, and the leveling float 26 is more than necessary. It is possible to prevent the existing planted seedlings and the like from lying down without flowing laterally outward.

The leveling float 26 is supported by the frame so that the rear side portion can swing around the lateral axis P1.
That is, as shown in FIGS. 4 and 5, there is provided a cylindrical float fulcrum shaft 42 that is located on the rear side of the main frame 35 and extends in the lateral width direction with substantially the same length as the entire length of the main frame 35. A pair of left and right support arms 43 extend from the float fulcrum shaft 42 to the rear lower side. The rear end portions of the pair of support arms 43 are pivotally connected to a connection bracket 44 fixed to the rear projecting portion 26C of the leveling float 26 so as to be rotatable around the horizontal axis. Accordingly, the leveling float 26 is supported so as to be swingable around the horizontal axis P <b> 1 at the connection point between the support arm 43 and the connection bracket 44.

  The float fulcrum shaft 42 is supported by a support bracket 45 that is fixedly extended from both ends of the main frame 35 so as to be rotatable around a lateral axis, and the planting depth adjustment lever is integrated with the float fulcrum shaft 42. 46 is fixed. By manually operating the planting depth adjustment lever 46, the float fulcrum shaft 42 is rotated, and the rear fulcrum position of the leveling float 26 can be adjusted vertically.

  The planting depth adjustment lever 46 is provided so as to be able to maintain its position in any one of the plurality of locking grooves 48 provided in the lever guide 47, and the vertical position of the rear fulcrum position of the leveling float 26 is adjusted in a plurality of stages. The position can be held at any of the positions.

  The leveling float 26 is restricted in the amount of vertical movement in a state where the front side can swing up and down within a predetermined range. Specifically, the forward projecting portion 26B is provided to be movable up and down within a predetermined range relative to the seedling planting device 6. The front overhanging portion 26 </ b> B and a hydraulic control valve V as a control means for controlling the hydraulic cylinder 4 are linked and linked through a linked operating member 49. Accordingly, the front overhanging portion 26B of the leveling float 26 is located at the center of the seedling planting device 6 in the lateral direction of the body, and is a grounding body S that can move up and down relatively with respect to the seedling planting device 6 while following the ground. Function.

When the description is added, as shown in FIG. 5, the connecting plate 51 is bolt-connected to the mounting portion 50 formed at the front side left and right center portion of the front projecting portion 26 </ b> B of the leveling float 26. A round rod-like connecting rod 52 is fixedly extended toward the direction. The connecting rod 52 is provided in a state of protruding to the right outer side than the right end portion of the front projecting portion 26B, and a U-shaped bracket 53 in a plan view is connected and fixed to the protruding end portion.
The connecting plate 51, the connecting rod 52, and the bracket 53 function as a relay member that connects the grounding body S and an interlocking operation member 49 described later. That is, the interlocking operation member 49 is connected to one end side of the relay member in the body width direction of the relay member, and the center portion of the front projecting portion 26B as the grounding body S in the body width direction is connected to the other end side of the relay member in the body width direction of the relay member. The positions are linked.

  As shown in FIG. 4, as described above, the bracket 53 provided in a state of protruding to the right outer side of the front overhanging portion 26 </ b> B is formed in a substantially portal shape in front view with the left and right sides sandwiched therebetween, and in the vertical direction. A long operation member 54 is fixed along the operation member 54, and one end portion of an operation wire 55 is linked to the operation member 54. The other end of the operation wire 55 is linked to the hydraulic control valve V. Therefore, the operation member 54 and the operation wire 55 constitute an interlocking operation member 49 that interlocks the front overhanging portion 23B and the hydraulic control valve V.

  The interlocking operation member 49 is provided on the right outer side of the link mechanism 5 (an example of the outer side on the one side in the body width direction). That is, as shown in FIG. 5, the interlocking operation member 49 is located above the bracket 53 in a state where the interlocking operation member 49 is located at a position separated from the right lower link 5 b to the right outside of the pair of left and right lower links 5 b and 5 b. The operation wire 55 extends toward the hydraulic control valve V provided on the traveling machine body 3 side while being curved.

  As shown in FIG. 4, the operation wire 55 includes an inner wire 55 a that can be pushed and pulled, and an outer wire 55 b that slidably covers the inner wire 55 a, and one end of the outer wire 55 b is an upper surface of the operation member 54. The inner wire 55 a is connected and fixed to 54 A and is provided in a state where one end of the inner wire 55 a enters the inside of the operation member 54. Although not shown, the other end portion of the operation wire 55 is linked to the hydraulic control valve V so that the operation oil supply state to the hydraulic cylinder 4 can be switched.

  An elongated hole 56 is formed in the left and right side surfaces 54B of the operation member 54 in the vertical direction, and an inner wire receiver 57 to which an end portion of the inner wire 55a is connected in a state of being inserted through the left and right elongated holes 56. Is provided. As will be described later, the inner wire receiver 57 is linked to the planting depth adjusting lever 46, and when the planting depth adjusting lever 46 is swung, the inner wire receiving member 57 moves up and down accordingly. When the planting depth adjustment lever 46 is in a fixed position, the position is fixed.

  As shown in FIGS. 4 and 5, a linkage member 58 that links and links the inner wire receiver 57 and the planting depth adjustment lever 46 is provided. The linking member 58 is formed by bending a bar in a substantially U shape in plan view to form a laterally extending portion 58a on the front side, a longitudinally extending portion 58b, and a laterally extending portion 58c on the rear side. ing. Further, the engaging action portion 58d is extended from the right end portion of the laterally extending portion 58c on the rear side in a state of being bent into a substantially L shape.

  A laterally extending portion 58c on the rear side of the linking member 58 is rotated around the horizontal axis P2 by a rotation support member 59 formed by bending a plate material into a substantially J-shape in a side view and fixed to the main frame 35. It is supported freely. The front side laterally extending portion 58a is provided so as to pass through the left and right elongated holes 56 of the operation member 54, and the inner wire receiver 57 is coupled to the front side laterally extending portion 58a. . Further, the engaging action portion 58d located on the rear side enters and engages with a locking recess 61 formed in the operation arm 60 fixedly extending from the float fulcrum shaft 42.

  Therefore, when the planting depth adjustment lever 46 is operated to rotate the float fulcrum shaft 42, the operation arm 60 swings, and the engagement action portion 58d is engaged with the operation arm 60. The linkage member 58 rotates integrally around the horizontal axis. As a result, the position of the inner wire receiver 57 is changed in the vertical direction. When the planting depth adjusting lever 46 is held in position by any of the locking grooves 48, the inner wire receiver 57 is fixed in position relative to the frame.

  A tension spring 62 is stretched between the inner wire receiver 57 and the operation member 54 and is elastically biased in a direction in which they are attracted to each other. Since the position of the inner wire receiving member 57 is fixed with respect to the frame body, the leveling float 26 is oscillated and biased downward.

  When the leveling float 26 that is urged to swing downward is grounded and receives ground pressure, it can swing relatively upward against the urging force of the tension spring 62. That is, the leveling float 26 swings up and down as the seedling planting device 6 moves up and down. However, the leveling float 26 is restricted in the amount of vertical movement within the range of the long hole 56.

  In the planting work on the farm field, when the leveling float 26 is grounded and the seedling planting device 6 becomes lower than the set height, in other words, the vertical swinging posture of the leveling float 26 is higher than the set posture (for example, horizontal posture). When the upper overhanging portion 26B is also swung upward, the operation wire 55 is operated and the hydraulic control valve V is switched to the raised state, and the seedling planting device 6 is raised by the hydraulic cylinder 4 to increase the set height. When it happens, the climb stops.

  When the seedling planting device 6 becomes higher than the set height, in other words, when the vertical swing posture of the leveling float 26 swings downward from the set posture, the front overhanging portion 26B is lowered downward, and the operation wire 55 is operated. The hydraulic control valve V is switched to the lowered state, the seedling planting device 6 is lowered by the hydraulic cylinder 4, and the lowering is stopped when the set height is reached.

  In this way, the forward projecting portion 26B of the leveling float 26 and the hydraulic control valve V for the hydraulic cylinder 4 are linked and linked via the linkage operating member 49, and based on the relative vertical movement displacement of the leveling float 26 with respect to the seedling planting device 6. Thus, the hydraulic cylinder 4 is controlled so that the seedling planting device 6 is maintained at a set height corresponding to the adjustment position of the planting depth adjustment lever 46.

[Another embodiment]
(1) In the above-described embodiment, the interlocking operation member 49 is provided on one side outward in the lateral width direction of the front overhang portion 26B of the leveling float 26. However, the interlocking operation member 49 is provided in the lateral width direction of the front overhang portion 26B. It is good also as a structure provided in the position which approached the horizontal width direction center side rather than the one side edge part.

(2) In the above-described embodiment, the fertilizer 14 that supplies fertilizer to the farm is provided at the rear of the traveling machine body 3, and the operation rod (transmission mechanism) 29 that transmits the power of the engine 20 to the fertilizer 14 is the link mechanism 5. However, the operation rod 29 may be provided in a state of being positioned between the left and right lower links 5 b in the link mechanism 5.
Further, the fertilizer application device 14 is not limited to the one located at the rear portion of the traveling machine body 3 and may be configured to be provided on the rear portion side of the seedling planting device 6.

(3) In the above embodiment, the interlock operation member 49 is provided on the right outer side of the link mechanism 5 and the operation rod (transmission mechanism) 29 is provided on the left outer side of the link mechanism 5. Instead of such a configuration, the interlocking operation member 49 may be provided on the left outer side of the link mechanism 5, and the operation rod (transmission mechanism) 29 may be provided on the right outer side of the link mechanism 5.

(4) In the above-described embodiment, the integrated leveling float 26 is provided that extends over substantially the entire width of the seedling planting device 6, but instead of such a configuration, the seedling planting device 6 is arranged along the width direction. A structure including a plurality of leveling floats may be used, and a structure located at the left and right center of the plurality of leveling floats may function as a grounding body that can move up and down relatively with respect to the seedling planting device 6.

(5) In the above embodiment, the link mechanism 5 includes a pair of left and right lower links 5b. However, the link mechanism 5 may include three or more lower links 5b arranged in the left-right direction. It may be configured by one link member.

(6) A soil covering member for backfilling mud into the groove after the fertilizer fed by the fertilizer application device 14 is supplied to the groove formed by the groove forming device 27 on the machine body rear side of the groove forming device 27 for fertilization. It is good also as a structure which provides (not shown). And, this soil covering member is provided in a state of projecting obliquely rearward sideways from the leveling float, and is formed in a blade shape so that the front portion projects higher than the upper surface of the leveling float, It is good to comprise so that mud can be filled in the groove efficiently.
Moreover, this soil covering member can be used not only for a groove for a fertilizer application but also for backfilling a groove in which seed pods have been sown by a seeding device.

(7) In the above embodiment, the number of planting strips is not limited to 4 but may be 3 or less or 5 or more.
For example, in the case where the seedling planting device 6 including the integrated leveling float 26 extending over substantially the entire width in the lateral width direction is configured in a five-row planting type as in the above embodiment, the integrated leveling float It is preferable that the bottom surface is formed as a flat surface without forming the mud-intake recess 41 as described above on the bottom surface of 26.

(8) In the above embodiment, the seedling planting device 6 is provided as a working device. However, the working device may be provided with another type of working device such as a seeding device that supplies seed pods to the field.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a paddy field work machine in which a work device is connected to a traveling machine body so as to be movable up and down, such as a ride type rice transplanter and a ride type direct seeder.

DESCRIPTION OF SYMBOLS 3 Traveling machine body 4 Actuator 5 Link mechanism 6 Working device 14 Fertilizer 20 Engine 26 Leveling float 26A Float main-body part 26B Front overhang | projection part (grounding body)
29 Transmission mechanism 49 Interlocking operation member V Control means

Claims (4)

A working device is connected to the rear part of the traveling machine body through a link mechanism so as to be movable up and down.
An actuator that can drive the working device up and down, a control unit that controls the actuator, and a vertical movement relative to the working device while following the grounding located at the center of the working device in the width direction of the machine body A grounding body, and an interlocking operation member that is linked to the grounding body and that extends upward from a link location to the grounding body and that is linked to the control means,
The grounding body and the interlocking operation member are connected to each other via a relay member along the body width direction,
One end side of the relay member in the lateral width direction of the relay member is connected to the interlocking operation member on the outer side of the lateral width direction of the link mechanism, and the other end side of the relay member in the lateral width direction of the relay member in the lateral width direction of the grounding body. A paddy field machine connected to the grounding body at a central position .   The paddy field work machine according to claim 1, wherein the interlocking operation member is provided on one outer side in the machine body width direction of the grounding body. A fertilizer application device for supplying fertilizer to the farm is provided at the rear of the traveling machine body,
The paddy field work machine of Claim 1 or 2 with which the transmission mechanism which transmits the motive power of an engine to the said fertilizer is provided in the body width direction other side outer side of the said link mechanism. The working device is provided with a leveling float extending over substantially the entire width in the width direction,
The leveling float is integrally formed with a front projecting portion on the center side in the lateral width direction as the grounding body and a float main body portion positioned on the rear side of the front projecting portion and extending over substantially the entire width in the lateral width direction of the working device. The paddy field machine according to any one of claims 1 to 3, wherein the paddy field work machine is formed on the paddy field.

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