JP2013059267A - Sulky paddy implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sulky paddy implement which is composed such that its energizing force changing mechanism is easily operated in the case where the implement is provided with an energizing mechanism energizing down ward the front part of a sensor float, an energizing force changing mechanism and a lifting/lowering control means.SOLUTION: In the implement, a height sensor 68 is disposed at an upper part of a sensor float 9 in a working device, a linking member 55 is connected to the height sensor 68 and the front part of the sensor float 9 to detect with the height sensor 68 the vertical position of the sensor float 9 relative to the working device. A lifting/lowering means is provided so that the height from a paddy surface G to the working device is kept at a predetermined height based on a detected value of the height sensor 68. On a part of the linking member 55 front side and of the upper side of the sensor float 9 in the working device are disposed an energizing mechanism 57 energizing the linking member 55 to the lower side and an energizing force changing mechanism 56 changing the energizing force of the energizing mechanism 57.

Description

  The present invention relates to a working device at the rear of the machine body and a sensor float supported by the working device in a riding type paddy field working machine such as a riding type rice transplanter or a riding direct seeding machine.

  In a riding type rice transplanter, which is an example of a riding paddy field work machine, a seedling planting device (equivalent to a work device) is supported at the rear of the machine so that it can be moved up and down, and a hydraulic cylinder that moves the seedling planting device up and down Equivalent to the mechanism). The rear part of the sensor float is supported by the lower part of the working device so that it can move up and down, and a height sensor is provided in the upper part of the sensor float in the seedling planting device, and it is linked to the front part of the sensor float and the height sensor. By connecting the members, the vertical position of the sensor float relative to the seedling planting device is detected by the height sensor.

  As a result, when the seedling planting device moves up and down with the progress of the aircraft, the height of the sensor float relative to the seedling planting device is detected by the height sensor. The height from the paddy to the seedling planting device can be detected, and based on the detection value of the height sensor, the height from the paddy to the seedling planting device is maintained at the set height. The hydraulic cylinder is automatically operated by the control means, and the planting depth of the seedling by the seedling planting device is maintained at the set depth (see Patent Document 1 above).

JP 2000-270624 A (see FIG. 2)

  As described above, when the sensor float is brought into contact with the surface of the field, the sensor float is provided with a biasing mechanism (such as a spring) that biases the front part of the sensor float downward so that the sensor float does not flutter up and down. It is necessary to provide an urging force changing mechanism for changing the urging force of the spring to a strength depending on the state of the surface.

According to Patent Document 1, when the linkage member is connected across the front part of the sensor float and the height sensor, the position where the urging force changing mechanism enters the rear side when viewed from the front side (the body side) of the seedling planting device. Therefore, when the operator manually operates the biasing force changing mechanism from the front side (airframe side) of the seedling planting device, the worker crosses the linkage member and the rear (inward) of the seedling planting device. There is room for improvement in terms of operability of the biasing force changing mechanism.
In the riding paddy field machine according to the present invention, when the urging mechanism, the urging force changing mechanism, and the lifting control means for urging the front part of the sensor float downward are provided, the urging force changing mechanism can be easily operated. The purpose is to configure.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a riding paddy field working machine.
A work mechanism is supported at the rear of the machine body so as to be movable up and down, and includes a lifting mechanism for driving the work device up and down.
A rear part of the sensor float that follows the ground contact with the surface is supported on the lower part of the working device so as to be movable up and down, and a height sensor is provided in an upper part of the sensor float in the working device, and the front part of the sensor float and the A connecting member is connected across the height sensor, and the vertical position of the sensor float relative to the working device is detected by the height sensor,
Based on the detection value of the height sensor, comprising a lifting control means for operating the lifting mechanism so that the height from the surface to the working device is maintained at a set height,
An urging mechanism for urging the linkage member downward on the upper side of the sensor float in the working device and on the front side of the linking member; and an urging force changing mechanism for changing the urging force of the urging mechanism; Is provided.

(Operation and effect of the invention)
The rear part of the sensor float is supported on the lower part of the working device so as to be movable up and down, and a height sensor is provided in the upper part of the sensor float in the working device, and a linking member is provided across the front part of the sensor float and the height sensor. When connected, the linking member is located at the front of the working device.

In this configuration, according to the first feature of the present invention, the biasing mechanism that biases the linkage member downward on the upper side of the sensor float and the front side of the linkage member in the working device, and the biasing force of the biasing mechanism are provided. Since the urging force changing mechanism to be changed is provided, the urging mechanism and the urging force changing mechanism are positioned on the front side of the work device.
Thus, when the operator manually operates the urging force changing mechanism from the front side (machine body side) of the work device, the worker does not have to put his hand behind (inward) the work device beyond the linkage member. The urging force change mechanism can be easily operated, and the linkage member will not interfere with the operation of the urging force change mechanism, improving the workability of the riding paddy field machine. did it.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the type paddy field working machine of the first feature of the present invention.
The detection arm of the height sensor is configured to swing up and down around the left and right axis, and extends forward and backward from the height sensor, spanning the rear part of the detection arm and the front part of the sensor float. Connecting the linkage members;
The urging mechanism is connected to the front portion of the detection arm, and the urging force changing mechanism is provided on the front side of the height sensor.

(Operation and effect of the invention)
According to the second feature of the present invention, the linkage member is connected to the rear part of the detection arm of the height sensor, the biasing mechanism is connected to the front part of the detection arm of the height sensor, and the biasing force is connected to the front side of the height sensor. Since the changing mechanism is provided, the urging mechanism and the urging force changing mechanism are moved forward from the linkage member by the length of the detection arm of the height sensor.
As a result, the urging mechanism and the urging force changing mechanism are further positioned on the front side of the work device, and the linkage member does not interfere with the operation of the urging force changing mechanism. The workability of the work machine could be improved.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the riding paddy field working machine of the second feature of the present invention.
A front end portion of the sensor float is disposed on the rear side of the height sensor, and the linkage member is connected across the rear portion of the detection arm and the front end portion of the sensor float.

(Operation and effect of the invention)
According to the third feature of the present invention, the front end portion of the sensor float is positioned below the height sensor and the linkage member, and the sensor float is unlikely to protrude forward of the linkage member. As a result, when the operator manually operates the urging force change mechanism from the front side (airframe side) of the work device, the sensor float does not interfere with the operation of the urging force change mechanism. The workability of the work machine could be improved.

It is a whole side view showing a riding type rice transplanter. It is a whole top view showing a riding type rice transplanter. It is a front view which shows a seedling planting apparatus. It is a top view which shows a seedling planting apparatus. It is a side view which shows a seedling planting apparatus. It is the side view which shows the vicinity of the sensor float of a seedling planting apparatus and the potentiometer, and shows the state by which the setting depth of the seedling was set to the deep state by the planting depth lever. It is a top view which shows the vicinity of the potentiometer of a seedling planting apparatus. It is the side view which shows the vicinity of the sensor float of a seedling planting apparatus and the potentiometer, and shows the state by which the setting depth of the seedling was set to the shallow state by the planting depth lever. It is a block diagram which shows the control apparatus and the cooperation state of each part. It is a front view which shows the vicinity of a stand in another embodiment of invention. It is a side view which shows the vicinity of a stand in another embodiment of invention. It is a perspective view which shows the attachment plate of a stand, the flat plate of a support frame, and an attachment member in another embodiment of invention. It is a top view which shows the seedling planting apparatus in another form of implementation of invention.

[1]
As shown in FIG. 1, a link mechanism 3 that can swing up and down is provided at the rear of the machine body that is supported by the right and left front wheels 1 and the right and left rear wheels 2, and six links are provided via the link mechanism 3. An example of a riding paddy field working machine is provided with a planting type seedling planting device 5 (corresponding to a working device) that is supported so as to be movable up and down and a hydraulic cylinder 4 (corresponding to a lifting mechanism) that drives the link mechanism 3 to move up and down. A riding rice transplanter is constructed.

  As shown in FIG. 1 and FIG. 2, a hopper 12 for storing fertilizer and three feeding portions 13 corresponding to two planting strips are provided on the rear side of the driver seat 31. A blower 14 is provided on the side. Two groovers 15 are fixed to a sensor float 9 and a side float 11 which will be described later, and six groovers 15 are provided. Six groovers 15 are provided across the feeding portion 13 and the groover 15. A hose 16 is connected.

[2]
Next, the seedling planting device 5 will be described.
As shown in FIGS. 1, 2, and 5, the seedling planting device 5 includes one feed case 17, three transmission cases 6, and a pair of rotation cases 7 that are rotatably supported at the rear part of the transmission case 6. , A pair of planting arms 8 provided at both ends of the rotating case 7, a central sensor float 9, a right and left side float 11, and a seedling surface that is driven by reciprocating lateral feed in the horizontal direction. The bed 10 and the vertical feed mechanism 25 provided on each of the seedling surfaces of the seedling table 10 are provided.

  As shown in FIGS. 3, 4, and 5, a support frame 18 having a quadrangular cross section arranged in the left-right direction is provided. It is fixed. A feed case 17 is fixed to the upper surface of the left and right center of the support frame 18, and the feed case 17 is supported so as to be able to roll around a front and rear axis P <b> 1 (see FIG. 3) at the rear lower portion of the link mechanism 3.

  As shown in FIG. 4, the transverse feed shaft 19 extends from the feed case 17, and the end of the transverse feed shaft 19 is supported by the support frame 18 via the support member 20, and as the transverse feed shaft 19 rotates. A feed member 21 that is driven to reciprocate laterally is fitted on the transverse feed shaft 19, and the feed member 21 is connected to the seedling table 10. A guide rail 38 is supported by the transmission case 6 in the left-right direction, and a lower portion of the seedling bed 10 is supported along the guide rail 38 so as to be laterally movable. As shown in FIGS. 3 and 4, the support member 26 is fixed to the right and left ends of the support frame 18 and extends upward, and the support member 50 is fixed over the upper portion of the support member 26. The guide rail 27 is fixed to the front surface of the upper part of the seedling raising base 10, and the guide rail 27 is supported by the roller 51 supported by the support member 50 so as to be laterally movable.

  As shown in FIG. 3, a belt-type vertical feed mechanism 25 is provided on each of the six seedling setting surfaces of the seedling setting table 10. As shown in FIG. 4, the longitudinal feed shaft 36 extends from the feed case 17, the end of the longitudinal feed shaft 36 is supported by the support frame 18 via a support member 37, and a pair of drive arms is attached to the longitudinal feed shaft 36. 36a is fixed and the longitudinal feed shaft 36 is driven to rotate. An input unit (not shown) for transmitting power to the six vertical feed mechanisms 25 is provided in the seedling bed 10, and the input unit is located between the drive arms 36 a of the vertical feed shaft 36. As a result, when the seedling bed 10 reaches the right or left end of the reciprocating lateral feed drive, the input portion reaches one drive arm 36a of the vertical feed shaft 36 and is input by one drive arm 36a of the vertical feed shaft 36. The parts are driven, and the seedlings on the seedling table 10 are sent downward by the six vertical feeding mechanisms 25.

[3]
Next, the transmission structure to the front wheel 1 and the rear wheel 2, the seedling planting device 5, and the feeding part 13 will be described.
As shown in FIG. 1, the power of the engine 49 is transmitted from a hydrostatic continuously variable transmission (not shown) to a front wheel 1 and a rear wheel 2 via a gear transmission auxiliary transmission (not shown). Has been. The power branched from between the hydrostatic continuously variable transmission and the auxiliary transmission is input through the planting clutch 87 (see FIG. 9) and the PTO shaft 22 to the input shaft 28 (see FIG. 4) provided in the feed case 17. ).

  As shown in FIG. 4, the power of the input shaft 28 is transmitted to the vertical feed shaft 36, and the vertical feed shaft 36 is rotationally driven, and the power of the input shaft 28 is transmitted through the horizontal feed speed change mechanism 29 to the horizontal feed shaft. Then, the transverse feed shaft 19 is driven to rotate. The power of the input shaft 28 is transmitted to the transmission chain 30, the transmission shaft 23 installed over the transmission case 6, and the input shaft 32 provided in the transmission case 6, and the power of the input shaft 32 is transmitted to the torque limiter 33, the transmission It is transmitted to the rotating case 7 via the chain 34, the small number of clutches 24, and the drive shaft 35. A cylindrical cover 60 is fixed over the transmission case 6, and the transmission shaft 23 is covered by the cover 60.

  As shown in FIGS. 1, 4, and 5, when the planting clutch 87 is operated in the transmission state, the rotation case 7 is moved as shown in FIG. The planting arm 8 alternately takes out the seedlings from the lower part of the seedling platform 10 and plantes them on the field G. The seedling platform 10 is placed at the right or left end of the reciprocating lateral feed drive. When reaching, the six vertical feed mechanisms 25 feed the seedlings on the seedling table 10 downward. When the planting clutch 87 is operated in the disconnected state, the reciprocating lateral feed drive of the seedling platform 10, the rotational drive of the rotary case 7, and the vertical feed mechanism 25 are stopped.

  As shown in FIGS. 1 and 9, the power of the auxiliary transmission is transmitted to the feeding portion 13 through the fertilizer clutch 90, and when the fertilizer clutch 90 is operated in the transmission state, a predetermined amount of fertilizer is supplied from the hopper 12. The fertilizer is fed by the feed unit 13 one by one, and the fertilizer is supplied to the groove forming device 15 through the hose 16 by the blower 14, and the fertilizer is supplied to the rice field G through the groove forming device 15. When the fertilizer clutch 90 is operated in the disconnected state, the feeding unit 13 stops.

[4]
Next, the raising / lowering structure of the seedling planting apparatus 5 will be described.
As shown in FIGS. 6 and 7, three sets of support arms fixed to the support shaft 41 are supported by the support shaft 41 so as to be rotatable around the horizontal axis P <b> 2 over the lower portions of the three transmission cases 6. 41a extends obliquely rearward and downward, and the rear portions of the sensor float 9 and the side float 11 are supported so as to be swingable up and down around the horizontal axis P3 at the rear end of the support arm 41a. An artificially operated planting depth lever 42 is fixed to the support shaft 41 and extends forward and upward. The planting depth lever 42 is inserted into a lever guide 43 fixed to the support frame 18. By engaging the planting depth lever 42 with the lever guide 43, the planting depth lever 42 can be held at an arbitrary position.

  6 and 8, the support shaft 41 and the support arm 41a are rotated by the planting depth lever 42, and the position of the horizontal axis P3 (the rear part of the sensor float 9 and the side float 11) is moved up and down. The setting depth of the seedling described later can be changed by changing to, and by engaging the planting depth lever 42 with the lever guide 43, the horizontal axis P3 (sensor float 9 and side float) The setting depth of the seedling can be set by fixing the position of 11).

  As shown in FIGS. 6 and 7, the sensor float 9 is configured to be short so that the front end portion of the sensor float 9 is disposed below the front surface portion of the support frame 18 in a side view. A support bracket 44 is fixed to the front surface portion of the support frame 18. A first link 45 configured by bending a plate material in a U-shape is supported so as to be swingable around the horizontal axis P4 of the support bracket 44, and a second link configured by bending a bar material in a U-shape. The link 52 is swingably supported around the horizontal axis P5 of the support bracket 44.

As shown in FIGS. 6 and 7, a support member 53 made of a casting is swingably supported on the end portions of the first and second links 45 and 52, so that the support bracket 44, the first and second links are provided. 45 and 52 and the support member 53 form a vertical quadruple link. A connecting rod 58 is connected across the planting depth lever 42 and the lower part of the first link 45, and the planting depth lever 42 is engaged with and held by the lever guide 43. The position is fixed.
As a result, when the planting depth lever 42 is operated to set the seedling set depth, the first link 45 is swung around the horizontal axis P4 by the linkage rod 58 in conjunction with this, which will be described later. The vertical distance between the potentiometer 68 and the horizontal axis P3 (the rear part of the sensor float 9 and the side float 11) does not change.

As shown in FIGS. 6 and 7, a potentiometer 68 (corresponding to a height sensor) is fixed to the support member 53, and a detection arm 54 is fixed to a detection shaft 68 a (rotatable around the left and right axis) of the potentiometer 68. The detection arm 54 extends from the detection shaft 68a of the potentiometer 68 forward (leftward in FIG. 6) and rearward (rightward in FIG. 6). A bracket 9a is fixed to the right side of the front end portion of the sensor float 9, and a linkage rod 55 (corresponding to a linkage member) is connected across the rear portion of the detection arm 54 and the bracket 9a of the sensor float 9. The linkage rod 55 is provided with a turnbuckle 55a so that the length of the linkage rod 55 can be adjusted. By adjusting the length of the linkage rod 55, the rear part of the detection arm 54 and the sensor float 9 can be adjusted. The vertical distance from the front end (bracket 9a) can be adjusted.
As a result, the potentiometer 68 is positioned above the sensor float 9 in the seedling planting device 5, and the front end (bracket 9 a) of the sensor float 9 and the connecting rod 55 are located on the rear side of the potentiometer 68 (right side in FIG. 6). Is in a position.

  As shown in FIGS. 6 and 7, a bifurcated support arm 56 (corresponding to an urging force changing mechanism) formed by bending a plate material into a U-shape is around the horizontal axis P6 of the support member 53 (from a potentiometer 68). Also, a coil spring 57 (corresponding to an urging mechanism) is connected across the end of the support arm 56 and the front of the detection arm 54. By inserting a fixing pin 56 a slidably supported by the support arm 56 into one of the plurality of fixing holes 53 a of the support member 53, the angle of the support arm 56 with respect to the support member 53 is changed, and the support arm 56 is moved. The urging force of the coil spring 57 can be changed by changing the angle of the support arm 56 with respect to the support member 53.

  Accordingly, as shown in FIGS. 6 and 7, the detection arm 54 is urged clockwise by the coil spring 57 in FIG. 6, and the linkage rod 55 and the front end of the sensor float 9 are urged downward. Yes, by changing the biasing force of the coil spring 57, the downward biasing force of the linkage rod 55 and the front end of the sensor float 9 can be changed.

[5]
Next, the raising / lowering control of the seedling planting apparatus 5 will be described.
As shown in FIGS. 6 and 7, the sensor float 9 is moved to the surface G by the point that the connecting rod 55 and the front end of the sensor float 9 are urged downward by the coil spring 57 and the buoyancy acts on the sensor float 9. Follow the ground contact. On the other hand, when the seedling planting device 5 moves up and down, the height from the field G (sensor float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) tends to change.

  As a result, as shown in FIGS. 6 and 9, the detection shaft 68 a of the potentiometer 68 is rotated by the linkage rod 55 via the detection arm 54, and the height from the surface G (sensor float 9) to the seedling planting device 5 is increased. The planting depth of the seedling by the planting arm 8 is detected by the potentiometer 68, and the detected value of the potentiometer 68 is input to the control device 40 (elevation control means 74). A control valve 71 for extending and retracting the hydraulic cylinder 4 by supplying and discharging hydraulic oil to and from the hydraulic cylinder 4 is provided. The control valve 71 is operated by the control device 40 (elevation control means 74).

  The state shown in FIGS. 6 and 9 is a state in which the position of the horizontal axis P3 (the rear part of the sensor float 9 and the side float 11) is set by the planting setting height lever 42, and is based on the detected value of the potentiometer 68. The height from the surface G to the potentiometer 68 is a state in which the set height A1 (set depth) is set. In this state, the detection value of the potentiometer 68 in which the bottom surface of the sensor float 9 is horizontal is set as the set detection value B1 corresponding to the set height A1 (set depth).

  As a result, when the seedling planting device 5 moves up and down with respect to the sensor float 9 following the ground contact with the surface G, a difference occurs between the detected value of the potentiometer 68 and the set detected value B1, and the control valve 71 is controlled by the control device 40. By being operated, the seedling planting device 5 is moved up and down by the hydraulic cylinder 4 so that there is no difference between the detected value of the potentiometer 68 and the set detected value B1.

Thus, the hydraulic cylinder 4 extends and contracts and the seedling planting device 5 moves up and down so that the detection value of the potentiometer 68 becomes the set detection value B1 (set height A1 (set depth)). The planting depth of the seedlings by the seedling planting device 5 (planting arm 8) is maintained at the set depth (the height from the rice field G (center float 9) to the potentiometer 68 (the size of the seedlings by the planting arm 8). (Planting depth) is maintained at the set height A1 (set depth))
As described above, the elevation control means 74 is configured, and the elevation control means 74 is provided in the control device 40 as software.

  In this case, as shown in FIG. 6 and FIG. 8, when the position of the horizontal axis P3 (the rear part of the sensor float 9 and the side float 11) is changed by the planting setting height lever 42, as described in the preceding item [4]. In conjunction with this, the first link 45 is swung around the horizontal axis P4 by the linkage rod 58, and a potentiometer 68 and a horizontal axis P3 (rear parts of the sensor float 9 and the side float 11), which will be described later, are connected. The vertical position of the seedling planting device 5 with respect to the sensor float 9 and the potentiometer 68 is changed without changing the vertical interval (set height A1), and the planting depth of the seedling by the planting arm 8 is changed.

  As shown in FIGS. 6 and 7, a bracket 59 having a U-shape in plan view is fixed to the upper portion of the support member 53, and a round bar-shaped upper limit member 61 is slidably supported by the bracket 59. A coil spring 62 that urges the upper limit member 61 toward the protruding side (detection arm 54 side) is externally fitted between the front end portion of the upper limit member 61 and the bracket 59, and a pin for preventing the upper limit member 61 from being pulled out. 61a is attached.

  As a result, as shown in FIGS. 6 and 8, when the seedling planting device 5 is lowered with respect to the sensor float 9 following the ground contact with the surface G, the detection arm 54 is moved counterclockwise in FIG. Swing operation is performed. When the swing operation of the detection arm 54 is large, the cylindrical contact portion 54a fixed to the detection arm 54 contacts the tip of the upper limit member 61, the coil spring 62 is compressed, and the detection arm 54 swings. The operation is stopped.

  As shown in FIGS. 6 and 7, a plurality of attachment holes are formed in the rear part of the upper limit member 61, and the position of the tip of the upper and lower members 61 is changed by changing the attachment position of the pin 61 a to the upper limit member 61. The (initial biasing force of the coil spring 62) can be changed along the moving direction of the contact portion 54a of the detection arm 54.

[6]
Next, the sensitivity change of the raising / lowering control of the seedling planting apparatus 5 will be described.
As shown in FIG. 9, an artificially operable dial-type sensitivity setting switch 70 is provided, and the operation position of the sensitivity setting switch 70 is input to the control device 40, and the set detection value is detected by the sensitivity setting switch 70. B1 (set height A1 (set depth)) can be changed.

  As shown in FIG. 9, when the sensitivity setting switch 70 is operated to the neutral position N between the sensitive side and the insensitive side, the set detection value B1 (set height A1 (set depth)) is not changed. When the sensitivity setting switch 70 is operated from the neutral position N to the sensitive side, the setting detection value B1 (setting height A1 (setting depth)) is changed slightly downward corresponding to the operation position of the sensitivity setting switch 70. . As a result, the bottom surface of the center float 9 at the set detection value B1 (set height A1 (set depth)) is slightly downward, the ground contact area of the center float 9 to the surface G increases, and the coil spring 57 is attached. Since the power is slightly reduced and the center float 9 follows the field surface G sensitively, the raising and lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be sensitive.

  As shown in FIG. 9, when the sensitivity setting switch 70 is operated from the neutral position N to the insensitive side, the set detection value B1 (set height A1 (set depth)) corresponds to the operating position of the sensitivity setting switch 70. It is changed slightly upward. As a result, the bottom surface of the center float 9 at the set detection value B1 (set height A1 (set depth)) is slightly upward, the ground contact area of the center float 9 to the surface G is reduced, and the coil spring 57 is attached. Since the power is slightly increased and the center float 9 follows the surface G insensitively, the raising and lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be insensitive.

[7]
Next, the rolling control of the seedling planting device 5 will be described.
As shown in FIGS. 3 and 9, the feed case 17 is supported so as to be able to roll around the front and rear axis P <b> 1 at the rear lower part of the link mechanism 3 (the seedling planting device 5 has It is supported so as to roll around the core P1). An inclination sensor 48 is fixed to the feed case 17, and the inclination angle of the right and left direction of the seedling planting device 5 with respect to the horizontal plane (field G) is detected by the inclination sensor 48, and the detected value of the inclination sensor 48 is the control device 40 ( It is input to the rolling control means 75).

  As shown in FIGS. 3 and 9, a rolling mechanism 46 is provided at the upper rear portion of the link mechanism 3, and the rolling mechanism 46 pushes and pulls a pair of wires 46 a that are pushed and pulled in the left-right direction and the wires 46 a. And a gear mechanism (not shown) and an electric motor 46b. A bracket 27 a is fixed to the right and left ends of the guide rail 27, and a spring 47 is connected between the arm 46 c fixed to the rolling mechanism 46 and the bracket 27 a of the guide rail 27. A spring 39 is connected across the wire 46 a and the right and left side portions of the support member 50.

As a result, as shown in FIG. 3, the right or left spring 47 is extended as the seedling setting base 10 is driven to reciprocate laterally, and the right (left) spring 47 is biased. The inclination of the seedling planting device 5 to the right (left) is suppressed, and the rolling mechanism 46 (electric motor 46b) is operated by the control device 40 (rolling control means 75) based on the detection value of the inclination sensor 48. Thus, the seedling planting device 5 is maintained horizontal (parallel to the rice field G).
As described above, the rolling control means 75 is configured, and the rolling control means 75 is provided in the control device 40 as software.

[8]
Next, the lifting lever 72 will be described.
As shown in FIGS. 1, 2, and 9, an elevating lever 72 is provided on the right side of the driver's seat 31, and the elevating lever 72 is configured to be freely operated in a raised position, a neutral position, a lowered position, and a planting position. The operation position of the elevating lever 72 is input to the control device 40. A potentiometer 88 for detecting the angle of the link mechanism 3 with respect to the airframe is provided, and the detected value of the potentiometer 88 is input to the control device 40, and the seedling planting device for the airframe is detected by detecting the angle of the link mechanism 3 with respect to the airframe. A height of 5 can be detected.

  As shown in FIG. 9, an electric motor 89 that operates the planting clutch 87 in the transmission and disconnection state and an electric motor 91 that operates the fertilization clutch 90 in the transmission and disconnection state are provided. ], The control device 40 is provided with the lifting control means and the rolling control means. As a result, the control device 71 operates the control valve 71, the electric motors 89 and 91, the lifting control means and the rolling control means as follows.

When the elevating lever 92 is operated to the raised position, the planting and fertilizing clutches 87 and 90 are operated in the disconnected state, and the hydraulic cylinder 4 is contracted to operate the seedling planting device with the elevating control means and the rolling control means stopped. 5 goes up. When the seedling planting device 5 reaches the upper limit position of the link mechanism 3, the hydraulic cylinder 4 stops, and the seedling planting device 5 stops at the upper limit position.
When the elevating lever 92 is operated to the neutral position, the planting and fertilizing clutches 87 and 90 are operated in the disconnected state, and the hydraulic cylinder 4 is stopped and the seedling planting device 5 is stopped in a state where the elevating control means and the rolling control means are stopped. Ascent and descent stops.

When the elevating lever 92 is operated to the lowered position, the planting and fertilizing clutches 87 and 90 are operated in the disconnected state, and the hydraulic cylinder 4 is extended to operate the seedling planting device with the elevating control means and the rolling control means stopped. 5 is lowered, and when the center float 9 contacts the surface G, the lifting control means and the rolling control means are operated.
When the elevating lever 92 is operated to the planting position, the planting and fertilizing clutch are operated in the transmission state while the elevating control means and the rolling control means are activated.

[Another Embodiment of the Invention]
As shown in FIG. 13, the seedling planting device 5 may include a leveling device 63. The leveling device 63 includes a support arm 64 supported by the right transmission case 6 so as to swing up and down around the horizontal axis, and a drive case 65 supported by the left transmission case 6 so as to swing up and down around the horizontal axis. The ground leveling body 66 is supported by the support arm 64 and the drive case 65 so as to be rotatable around the horizontal axis. The power of the input shaft 32 of the left transmission case 6 is transmitted to the leveling body 66 via a transmission chain (not shown) inside the drive case 65, and the leveling body 66 is rotationally driven in the down cut direction. Field G is leveled.

  In the riding type rice transplanter, the stand 67 may be attached to the support frame 18 for transportation or maintenance. As shown in FIGS. 10 and 11, the stand 67 is formed by bending a round pipe into a U-shape, and includes a linear horizontal bar portion 67a, a first vertical bar portion 67b, and a second vertical bar portion 67c. ing.

  As shown in FIGS. 10, 11 and 12, a flat plate 18a is fixed to the right and left ends of the support frame 18, and two upper and lower mounting holes 18b are formed in the flat plate 18a. A nut 18c is fixed inside. A flat mounting plate 67d is fixed to the upper end portion of the second vertical rod portion 67c of the stand 67, and two upper and lower mounting holes 67e are formed in the mounting plate 67d.

  As shown in FIGS. 10, 11, and 12, a mounting member 69 is prepared. The attachment member 69 is integrally formed of a synthetic resin, and has a vertically long main body 69a, pins 69b and 69c formed on the front and back sides of one end of the main body 69a, and the other end of the main body 69a. A mounting hole 69d is formed.

  Thus, as shown in FIGS. 10, 11, and 12, when the stand 67 is attached to the support frame 18, the upper end portion of the first vertical rod portion 67 b of the stand 67 is bolted to the lower surface near the center of the support frame 18. The pin 69b of the attachment member 69 is inserted into the attachment hole 18b on the upper side of the support frame 18 while the attachment member 69 is sandwiched between the flat plate 18a of the support frame 18 and the attachment plate 67d of the stand 67, and the pin 69c of the attachment member 69 is inserted. Is inserted into the mounting hole 67e on the upper side of the stand 67. By screwing the bolt 73 into the lower mounting hole 67e of the stand 67, the mounting hole 69d of the mounting member 69, the lower mounting hole 18b of the support frame 18, and the nut 18c, the second vertical rod portion 67c ( The mounting plate 67d) is connected to the flat plate 18a of the support frame 18.

  In this way, the second vertical bar portion 67c of the stand 67 positioned on the laterally outer side of the seedling planting device 5 is connected to the flat plate 18a of the support frame 18 via the synthetic resin mounting member 69, so that it can be transported. In this case, even if the second vertical bar portion 67c of the stand 67 comes into contact with another object, the mounting member 69 is broken so that the impact is not transmitted to the mounting plate 67d of the stand 67 and the support frame 18.

  As shown in FIG. 13, in a state where the stand 67 is attached to the support frame 18, the stand 67 (second vertical bar portion 67 c) is located on the inner side (left and right center side) of the support arm 64 and the drive case 65. As shown in FIG. 11, the second vertical rod portion 67 c of the stand 67 is bent to the front side in a “<” shape in a side view, and the second vertical rod portion 67 c of the stand 67 is formed at the front portion of the side float 11. I try not to interfere.

  The present invention can be applied not only to a riding type rice transplanter but also to a riding type direct seeding machine in which a direct sowing device (corresponding to a working device) is supported at the rear of the machine body so as to be movable up and down.

DESCRIPTION OF SYMBOLS 4 Lifting mechanism 5 Working apparatus 9 Sensor float 54 Detection arm 55 Linking member 56 Energizing force change mechanism 57 Energizing mechanism 68 Height sensor 74 Elevating control means G surface

Claims (3)

A work mechanism is supported at the rear of the machine body so as to be movable up and down, and includes a lifting mechanism for driving the work device up and down.
A rear part of the sensor float that follows the ground contact with the surface is supported on the lower part of the working device so as to be movable up and down, and a height sensor is provided in an upper part of the sensor float in the working device, and the front part of the sensor float and the A connecting member is connected across the height sensor, and the vertical position of the sensor float relative to the working device is detected by the height sensor,
Based on the detection value of the height sensor, comprising a lifting control means for operating the lifting mechanism so that the height from the surface to the working device is maintained at a set height,
An urging mechanism for urging the linkage member downward on the upper side of the sensor float in the working device and on the front side of the linking member; and an urging force changing mechanism for changing the urging force of the urging mechanism; Riding type paddy field work machine. The detection arm of the height sensor is configured to swing up and down around the left and right axis, and extends forward and backward from the height sensor, spanning the rear part of the detection arm and the front part of the sensor float. Connecting the linkage members;
The riding type paddy field work machine according to claim 1, wherein the biasing mechanism is connected to a front portion of the detection arm, and the biasing force changing mechanism is provided on the front side of the height sensor.   The riding type according to claim 2, wherein a front end portion of the sensor float is disposed on a rear side of the height sensor, and the linkage member is connected across a rear portion of the detection arm and a front end portion of the sensor float. Paddy field machine.

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