JP2009291146A - Paddy field working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paddy field working machine having a land grading apparatus between a paddy field working apparatus and a machine body and effective for avoiding the interference of the land grading apparatus with the paddy field working apparatus and the machine body in the case of making the paddy field working apparatus to enable free lifting and lowering motion and the land grading apparatus to enable free change of the height of the apparatus. <P>SOLUTION: The paddy field working apparatus 5 is supported in a freely liftable state at the back of the machine body through a link mechanism 3, and the land grading apparatus 53 is supported in a freely liftable state between the paddy field working apparatus 5 and the machine body. The machine is further provided with a changing means 56 to freely change the height of the land grading apparatus 53 relative to the paddy field working apparatus 5 or the machine body. The machine is additionally provided with a controlling means to apply a restriction on the change of the height of the land grading apparatus 53 by the changing means 56 according to the height of the paddy field working apparatus 5 relative to the machine body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a paddy field work machine such as a riding type rice transplanter or a riding type direct seeding machine in which a paddy field work device such as a seedling planting device or a direct seeding device is supported at the rear part of the machine body through a link mechanism.

  In a riding type rice transplanter that is an example of a paddy field work machine, for example, as disclosed in Patent Document 1, seedling planting is performed at the rear part of the machine body via a link mechanism (3 in FIGS. 1 and 2 of Patent Document 1). A device (corresponding to a paddy field working device) (5 in FIGS. 1 and 2 of Patent Document 1) is supported so as to be movable up and down, and a leveling device (53 in FIGS. 1 and 2 of Patent Document 1) is used as a seedling planting device. There is one that can be moved up and down between the aircraft. Thereby, it is possible to plant seedlings with the seedling planting device while leveling the surface with the leveling device, and the height (leveling depth) of the leveling device can be changed.

  In patent document 1, it is equipped with the raising / lowering control means which raises / lowers a seedling planting apparatus automatically with respect to a body so that a seedling planting apparatus may be maintained from a rice field regardless of the attitude | position change of a body. The seedling planting device is maintained at the set height from the rice field, so that the seedling planting depth by the seedling planting device is maintained at the set depth (paragraph numbers [0044] to [0049 of Patent Document 1). ]). In this case, the planting depth (set depth) of the seedling by the seedling planting device can be changed by changing the above-described set height up and down (see paragraph number [0050] of Patent Document 1). .

  In Patent Document 1, when the set height is changed up and down as described above, the height of the leveling device with respect to the seedling planting device (or body) is also changed up and down, and the leveling depth of the leveling device is constant. (See paragraph numbers [0068] to [0073] of Patent Document 1). Even after the height of the leveling device with respect to the seedling planting device (or body) is changed up and down, by operating the leveling setting switch (84 in FIG. 7 of Patent Document 1), the seedling planting device (or body) ) Can be arbitrarily changed up and down, and the leveling depth of the leveling device can be changed.

JP 2007-300827 A

  When moving up and down a paddy field work device with a link mechanism in a paddy field work machine, the link mechanism lifts and lowers the paddy field work device while drawing an arc trajectory, so depending on the height of the paddy field work device relative to the body, the front and back direction of the paddy field work device (The paddy field work device moves forward and approaches the machine body, or the paddy field work apparatus moves backward and leaves the machine body).

  In the state as described above, if the height of the leveling device disposed between the paddy field work device and the machine body is changed up and down, the leveling device may interfere with the paddy field work device and the machine body. Even if the leveling device does not interfere with the paddy field work device or the machine body, if the leveling device is too close to the paddy field work device, mud scattered from the leveling device to the rear tends to adhere to the paddy field work device.

  The present invention relates to a paddy field work machine equipped with a leveling device between the paddy field work device and the machine body, when the paddy field work device is configured to be movable up and down and the height of the leveling device can be changed up and down. The purpose is to avoid interference with the device and the machine body, to avoid a situation where the leveling device is too close to the paddy field work device and mud scattered backward from the leveling device tends to adhere to the paddy field work device. It is aimed.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a paddy field work machine.
A paddy field work device is supported at the rear of the machine body through a link mechanism so as to be movable up and down, and a leveling device is supported between the paddy field work apparatus and the machine body so as to be raised and lowered. A change means is provided that can freely change the height of the leveling device relative to the paddy field work device or the machine body. According to the height of the paddy field working device with respect to the machine body, there is provided limiting means for limiting the height change of the leveling device by the changing means.

(Function)
According to the first feature of the present invention, when the position of the paddy field working device in the longitudinal direction of the paddy field working device changes according to the height of the paddy field working device with respect to the body when the paddy field working device is lifted and lowered by the link mechanism, In the state of moving forward and approaching the body, it is only necessary to limit the height change of the leveling device relative to the paddy field work device or the body (for example, limiting the height change of the leveling device in the direction approaching the paddy field work device) do it).

As a result, even if the operator operates the changing means and changes the height of the leveling device up and down, the leveling device interferes with the paddy field work device or the leveling device is too close to the paddy field work device. It can be avoided.
For example, when the leveling device is supported by the front part of the paddy field working device, if the paddy field working device moves forward and approaches the aircraft, the leveling device also approaches the aircraft. In this state, by restricting the height change of the leveling device in the direction approaching the airframe, it is possible to avoid the state where the leveling device interferes with the airframe or the state where the leveling device is too close to the airframe.

(The invention's effect)
According to the first feature of the present invention, in a paddy field working machine equipped with a leveling device between the paddy field working device and the machine body, the paddy field working device can be raised and lowered and the height of the leveling device can be changed up and down. Thus, it was possible to avoid the state where the leveling device interfered with the paddy field work device and the machine body, and the damage to the leveling device and the paddy field work device could be avoided. The leveling device was too close to the paddy field working device, so that mud scattered backward from the leveling device was likely to adhere to the paddy field working device, and a situation that hindered the operation of the paddy field working device could be avoided.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
When the height of the paddy field work apparatus with respect to the machine body is set above or below the lifting range, the limiting means is configured so that the range of height change of the leveling apparatus by the changing means is limited to the narrow side.

The third feature of the present invention resides in the following configuration in the paddy field working machine of the second feature of the present invention.
When the height of the paddy field work device with respect to the aircraft is set above the lifting range, the change of the height of the leveling device by the changing means is restricted, so that the change of the height of the leveling device by the changing means is limited. The limiting means is configured so that the range is limited to the narrow side.

A fourth feature of the present invention resides in the following configuration in the paddy field working machine of the second or third feature of the present invention.
When the height of the paddy field work device relative to the aircraft is set below the lifting range, the change means limits the change of the height of the leveling device to the upper side. The limiting means is configured so that the range is limited to the narrow side.

(Function)
According to the second, third, and fourth features of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “action” is provided. ing.
When paddy field work equipment is moved up and down by a link mechanism in a paddy field work machine, in general, when the paddy field work apparatus is positioned at an intermediate position of the lifting range, the leveling equipment can work in paddy fields even if the height of the leveling equipment is changed up and down. It is unlikely to interfere with the device or the aircraft or be too close. Conversely, if the paddy field work device is positioned above or below the lifting range, there is a high possibility that the leveling device will interfere with the paddy field work device or the machine body when the height of the leveling device is changed up and down.

  According to the second, third, and fourth features of the present invention, the height of the paddy field work device relative to the machine body is set above or below the lifting range, and the leveling device is more likely to interfere with the paddy field work device and the machine body. In this case, the range of height change of the leveling device is limited to the narrow side, avoiding the situation where the leveling device interferes with the paddy field work device or machine body, or the state where the leveling device is too close to the paddy field work device or machine body can do.

(The invention's effect)
According to the second, third and fourth features of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. It has an “effect”.
According to the second, third, and fourth features of the present invention, even if the height of the paddy field working device relative to the machine is set above or below the lifting range, the range of height change of the leveling device is limited to the narrow side, Damage to the leveling equipment and paddy field equipment could be avoided appropriately. Since the mud scattered backward from the leveling device easily adheres to the paddy field work device, it was possible to avoid a state that hindered the operation of the paddy field work device.

[III]
(Constitution)
The fifth feature of the present invention resides in the following configuration in any one of the first to fourth features of the present invention.
Load detecting means for detecting a load applied from the surface to the leveling device is provided. When the detection value of the load detection means increases, the height of the leveling device relative to the paddy field work device or machine is changed upward, and when the detection value of the load detection means decreases, the height of the leveling device relative to the paddy field work device or machine decreases downward The adjustment means to change to is provided.

(Function)
According to the fifth feature of the present invention, the “action” described in the preceding paragraphs [I] and [II] is provided as in any one of the first to fourth features of the present invention. It has “action” like
When the aircraft is in a state where the leveling device is in contact with the field surface, the leveling device performs leveling of the field surface, so that a load is applied from the surface to the leveling device. In this case, in general, when the load applied to the leveling device from the surface is large, it can be determined that the leveling device is deeply entering the surface, and that the mud on the surface is being pushed by the leveling device. Conversely, if the load applied to the leveling device from the surface is small, it can be determined that the leveling device has not entered the surface very much.

  According to the fifth aspect of the present invention, when the load applied to the leveling device from the paddy surface increases, the height of the leveling device relative to the paddy field work device or the machine body is changed upward, and when the load applied to the leveling device from the paddy surface decreases, the paddy field The height of the leveling device relative to the work device or the machine body is changed downward. This avoids the situation that the leveling device goes too deep into the surface and pushes the mud on the surface, and the state that the leveling device does not enter the surface much and the leveling of the surface is not performed sufficiently. Avoided.

(The invention's effect)
According to the fifth aspect of the present invention, the “effect of the invention” described in the preceding paragraphs [I] and [II] is provided in the same manner as any one of the first to fourth aspects of the present invention. The following “effects of the invention” are provided.
According to the fifth feature of the present invention, a malfunction caused by the leveling device penetrating too deeply into the field and pushing mud on the field (for example, mud pushed by the leveling device flows sideways and has already been planted on the field. ) And a state that the leveling of the paddy field is not sufficiently performed can be avoided, and the work performance of the leveling device can be improved.

[IV]
(Constitution)
The sixth feature of the present invention resides in the following configuration in any one of the first to fourth features of the present invention.
A speed detecting means for detecting the traveling speed of the airframe is provided. When the detection value of the speed detection means increases, the height of the leveling device relative to the paddy field work device or machine is changed upward, and when the detection value of the speed detection means decreases, the height of the leveling device relative to the paddy field work device or machine decreases downward The adjustment means to change to is provided.

(Function)
According to the sixth aspect of the present invention, the “action” described in the preceding paragraphs [I] and [II] is provided in the same manner as any one of the first to fourth aspects of the present invention. It has “action” like
When the aircraft advances while the leveling device is in contact with the field, the leveling device may push the mud on the surface if the traveling speed of the aircraft becomes high with the leveling device deeply entering the field. On the other hand, if you want to reduce the plane's running speed and level the surface sufficiently (for example, leveling when the aircraft is turning, etc.), if the leveling device does not enter the surface sufficiently, It may not be done sufficiently.

  According to the sixth aspect of the present invention, when the traveling speed of the aircraft increases, the height of the leveling device relative to the paddy field working device or the aircraft is changed upward, and when the traveling speed of the aircraft decreases, the paddy field working device or the aircraft. The height of the leveling device with respect to is changed downward. This avoids a situation where the leveling device goes too deep into the surface and pushes the mud on the surface when the traveling speed of the aircraft is high. When leveling is desired, the state where the leveling device does not sufficiently enter the field and the leveling of the field is not sufficiently performed is avoided.

(The invention's effect)
According to the sixth aspect of the present invention, as in any one of the first to fourth aspects of the present invention, the “effect of the invention” described in the preceding paragraphs [I] and [II] is provided. The following “effects of the invention” are provided.
According to the sixth aspect of the present invention, a malfunction caused by the leveling device penetrating too deeply into the field and pushing mud on the field (eg, mud pushed by the leveling device flows sideways and has already been planted on the field. ) And a state that the leveling of the paddy field is not sufficiently performed can be avoided, and the work performance of the leveling device can be improved.

[V]
(Constitution)
A seventh feature of the present invention resides in the following configuration in any one of the first to sixth features of the present invention.
A leveling device is configured by including a rotating body that is rotationally driven by power to level the field. The transmission system for the leveling device is branched from the transmission upper side of the transmission for traveling and the transmission for the paddy field working device, and the power is transmitted to the leveling device via the transmission system for the leveling device. A transmission for the leveling device is provided in the transmission system for the leveling device.

(Function)
According to the seventh aspect of the present invention, in addition to any one of the first to sixth characteristics of the present invention, the “action” described in the preceding paragraphs [I] to [IV] is provided. It has the following “actions”.
In general, the power of the engine is transmitted to a traveling wheel through a traveling transmission, and is transmitted to the paddy working apparatus through a transmission for a paddy working apparatus. Accordingly, the traveling speed of the aircraft can be arbitrarily set by operating the traveling transmission, and the state of the paddy field working device (for example, seedling planting) can be set by operating the transmission for the paddy field working device. The planting interval (between stocks) of the device can be arbitrarily set.

According to the seventh aspect of the present invention, the transmission system for the leveling device is branched from the upper transmission side of the transmission for traveling and the transmission for paddy field working device, and the leveling device is transmitted via the transmission system for the leveling device. The power transmission is configured, and a transmission for the leveling device is provided in the transmission system for the leveling device.
As a result, even when the transmission for traveling and the transmission for paddy field work are operated as described above, power that is not affected by this operation is transmitted to the leveling device. Regardless of the transmission for the paddy field work device, the leveling device is driven at a constant rotational speed. By operating the transmission for the leveling device, the rotational speed of the leveling device can be set to an arbitrary value regardless of the transmission for traveling and the transmission for paddy field work device.

(The invention's effect)
According to the seventh feature of the present invention, as in any one of the first to sixth features of the present invention, the “effect of the invention” described in the preceding items [I] to [IV] is provided. In addition, the following “effects of the invention” are provided.
According to the seventh aspect of the present invention, the leveling device can be driven at a constant rotational speed regardless of the transmission for traveling and the transmission for paddy field work device, and the rotational speed of the leveling device can be reduced. An arbitrary value can be set, and the number of rotations of the leveling device can be appropriately set according to various working conditions, thereby improving the work performance of the leveling device. .

[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. A planting type seedling planting device 5 (corresponding to a paddy field working device) is supported so as to be movable up and down, and a hydraulic cylinder 4 that drives the link mechanism 3 to move up and down is provided to constitute a riding type rice transplanter that is an example of a paddy field working machine. Has been.

Next, the seedling planting device 5 will be described.
As shown in FIGS. 1, 2, and 4, 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 center center float 9 and side floats 11, a seedling platform 10 which is provided with six seedling mounting surfaces and is reciprocally laterally driven in the horizontal direction. A vertical feed mechanism 25 and the like provided on each of the seedling setting surfaces of the seedling setting table 10 are provided. A feed case 17 and a transmission case 6 are fixed to a support frame 18 arranged in the left-right direction, and the feed case 17 is supported so as to be able to roll around a front and rear axis P1 (see FIG. 3) at the rear lower portion of the link mechanism 3. Has been.

  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. 2 and 3, 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. 2, 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 the support member 37, and the longitudinal feed is performed by the power of the input shaft 28. The shaft 36 is rotationally driven, and a pair of drive arms 36 a are fixed to the longitudinal feed shaft 36. 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.

  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 the center float 9 and the side float 11, and six groovers 15 are provided. Six hoses 16 extend between the feeding portion 13 and the groover 15. Is connected.

[2]
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. 7, the power of the engine 49 is changed from a hydrostatic continuously variable transmission 73 (corresponding to a traveling transmission) to a gear transmission-type auxiliary transmission 76 (corresponding to a traveling transmission). And transmitted to the front wheel 1 and the rear wheel 2. A transmission system branched from between the hydrostatic continuously variable transmission 73 and the auxiliary transmission 76 is connected to the planting clutch 87 and the PTO shaft 22 (see FIG. 1) from the inter-strain transmission 85 (corresponding to a transmission for paddy field work equipment). ) 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, the vertical feed shaft 36 is rotationally driven, and the power of the input shaft 28 is transmitted to the horizontal feed shaft 19 via the horizontal feed speed change mechanism 29. The transverse feed shaft 19 is rotationally driven. The power of the input shaft 28 is transmitted to the transmission chain 30, the transmission shaft 23 installed across 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.

  4 and FIG. 7, when the planting clutch 87 is operated in the transmission state, the rotary case 7 is moved as shown in FIG. The planting arm 8 is driven to rotate counterclockwise on the page, and the planting arms 8 alternately take out the seedlings from the lower part of the seedling platform 10 and plant them on the field G. The seedling platform 10 reaches the right or left end of the reciprocating lateral feed drive. Then, the seedlings on the seedling table 10 are sent downward by the six vertical feeding mechanisms 25. 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 FIG. 7, the power of the auxiliary transmission 76 is transmitted to the feeding portion 13 via the fertilizer clutch 90, and when the fertilizer clutch 90 is operated in the transmission state, the fertilizer is fed from the hopper 12 by a predetermined amount. The fertilizer is fed by the section 13 and supplied by the blower 14 through the hose 16 to the groove producing device 15, and the fertilizer is supplied to the rice field G through the groove producing device 15. When the fertilizer clutch 90 is operated in the disconnected state, the feeding unit 13 stops.

[3]
Next, the leveling device 53 will be described.
As shown in FIGS. 2, 3, and 4, the boss member 64 is fixed to the left end portion of the support frame 18, and the transmission case 81 is attached to the boss member 64 around the horizontal axis P <b> 2 of the transmission shaft 23 and the input shaft 32. It is supported so as to be swingable up and down and extends obliquely forward and downward. A bracket 82 is fixed to the right end of the support frame 18, and a support arm 83 is swingably supported around the horizontal axis P <b> 2 of the bracket 82 (the horizontal axis P <b> 2 of the transmission shaft 23 and the input shaft 32). The drive shaft 61 having a square cross section is rotatably supported across the transmission case 81 and the support arm 83.

  As shown in FIG. 6, a small-width rotating body 62 integrally formed of a synthetic resin is provided. The rotating body 62 includes a boss portion 62a, a mounting hole 62b having a square cross section formed in the boss portion 62a, a flange portion 62c connected to the boss portion 62a, and a convex leveling portion connected to the outer peripheral portion of the flange portion 62c. 62d is provided. As shown in FIGS. 2, 3, and 4, the drive shaft 61 is inserted into the boss portions 62 a (mounting holes 62 b) of the large number of rotating bodies 62, and the rotating body 62 is fixed to the driving shaft 61. A spacer 63 is externally fitted to the position of the rotating body 62.

  As shown in FIGS. 2, 3, and 4, the bracket 65 is fixed to the transmission case 81 and the support arm 83, and the synthetic resin cover 66 is attached to the bracket 65 so as to be positioned outside the transmission case 81 and the support arm 83. It is fixed. A round pipe-shaped support frame 67 is fixed across the bracket 65, and a synthetic resin cover 66 is fixed to the support frame 67. The cover 66 is a relatively soft thin plate and is located behind the rotator 62. With the cover 66 not in contact with the surface G, the lower end of the outer periphery of the rotator 62 and the lower end of the cover 66 Are located at approximately the same height.

  As shown in FIGS. 2, 3, and 4, the leveling device 53 is configured by the drive shaft 61, the rotating body 62, the cover 66, the support frame 67, the transmission case 81, the support arm 83, and the like. The leveling device 53 is supported on the front part of the seedling planting device 5 (center float 9 and side float 11), the leveling device 53 is arranged behind the rear wheel 2, and the transmission case 81 and the support arm 83 are on the horizontal axis. By swinging up and down around the core P2, the leveling device 53 is supported by the front portion of the seedling planting device 5 so as to be movable up and down (corresponding to a state in which the leveling device is provided between the machine body and the paddy field work device). ).

[4]
Next, the transmission structure to the leveling device 53 and the lifting structure of the leveling device 53 will be described.
As shown in FIG. 4, the transmission shaft 75 connected to the input shaft 32 is disposed inside the boss member 64 and the transmission case 81. Inside the transmission case 81, a sprocket 78 is fitted on the transmission shaft 75 so as to be relatively rotatable, a sprocket 79 is fixed to the drive shaft 61, and a transmission chain 80 is wound around the sprockets 78, 79. A torque limiter 77 is provided between the transmission shaft 75 and the sprocket 78.

  As shown in the preceding item [2] and FIGS. 1, 4 and 7, the power of the engine 49 is transmitted to the input shaft 28, the transmission chain 30, the transmission shaft 23 and the input shaft 32 via the planting clutch 87 and the PTO shaft 22. Then, the power of the input shaft 32 is transmitted to the drive shaft 61 via the transmission shaft 75, the torque limiter 77, and the transmission chain 80, and the drive shaft 61 and the rotating body 62 are driven to rotate counterclockwise in FIG. Is done.

  In this case, the drive shaft 61 and the rotating body 62 are rotationally driven at a speed higher than the traveling speed of the airframe (the peripheral speed of the outer peripheral portion of the rotating body 62 is higher than the peripheral speed of the outer peripheral portion of the right and left rear wheels 2. The drive shaft 61 and the rotating body 62 are rotationally driven at a high speed so as to be high speed). As a result, the front surface G of the planting arm 8 is leveled (scraped) by the drive shaft 61 and the rotating body 62, and mud is scattered from the drive shaft 61 and the rotating body 62 to the seedling planting device 5 behind. Is stopped by the cover 66.

  As shown in FIG. 7, the seedling planting device 5 (planting seedlings with the planting arm 8) and the feeding portion are operated by operating the planting and fertilization clutches 87, 90 to the transmission and shut-off state by the electric motors 89, 91. At the same time, the leveling device 53 (the drive shaft 61 and the rotating body 62) is activated and stopped. When a large load is generated on the drive shaft 61 and the rotating body 62 due to foreign matters such as stones being caught in the drive shaft 61 and the rotating body 62, the drive shaft 61 and the rotating body 62 are driven by the torque limiter 77 (see FIG. 4). The driving shaft 61 and the rotating body 62 are stopped.

  As shown in FIGS. 2, 3, and 5, the support frame 52 is fixed to the support frame 18 so as to be positioned on the left side of the link mechanism 3, and a fan-shaped elevating gear around the horizontal axis P <b> 3 of the support frame 52. 54 is supported so as to be swingable up and down, and a gear mechanism 55 provided with a pinion gear 55 a and an electric motor 56 (corresponding to a changing means) for driving the gear mechanism 55 are fixed to the support frame 52. The pinion gear 55a is engaged with the elevating gear 54. At the center of the drive shaft 61, a boss member 57 is externally fitted to the drive shaft 61 so as to be relatively rotatable by a bearing (not shown), and a rod 58 is connected across the elevating gear 54 and the boss member 57. Yes. A spring 59 is connected across the bracket 65 and the support member 26, and the leveling device 53 is biased upward by the biasing force of the spring 59.

  With the above structure, as shown in FIGS. 2, 3, and 5, the pinion gear 55a of the gear mechanism 55 is rotated forward and backward by the electric motor 56, and the elevating gear 54 is driven to swing up and down around the horizontal axis P3. By doing so, the leveling device 53 is raised and lowered with respect to the seedling planting device 5. In this case, in the state where the seedling planting device 5 is located at the work position as shown in FIG. 8, the electric motor is within the range of the retreat position A3 located above the field surface G and the work position A4 contacting the field surface G. The leveling device 53 can be moved up and down by 56.

  As shown in FIGS. 5 and 8, the potentiometer 74 is fixed to the support frame 52 so as to be positioned on the horizontal axis P3, and the potentiometer 74 and the lifting gear 54 are connected, and the detection value of the potentiometer 74 is controlled. It is input to the device 40. Thereby, the height of the leveling device 53 with respect to the seedling planting device 5 is detected by detecting the angle of the elevating gear 54 with respect to the support frame 52 by the potentiometer 74.

[5]
Next, raising and lowering of the seedling planting device 5 and the leveling device 53 will be described with reference to FIG.
As shown in FIGS. 1 and 8, an elevating operation lever 72 is provided on the right side of the driver seat 31, and the elevating operation lever 72 is configured to be freely operated in an ascending position, a neutral position, a descending position, and a planting position. The operation position of the lifting operation 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. By detecting the angle of the link mechanism 3 with respect to the airframe, seedling planting for the airframe The height of the device 5 can be detected.

  As shown in FIG. 8, a control valve 71 that supplies and discharges hydraulic oil to and from the hydraulic cylinder 4 to expand and contract the hydraulic cylinder 4, an electric motor 89 that operates the planting clutch 87 in a transmission and shut-off state, and a fertilizer clutch 90. Is provided with an electric motor 91 for operating in a transmission and shut-off state. As described in [6] to [10], which will be described later, an elevating control means, a rolling control means, and a leveling control means are provided.

  As a result, the control device 71 operates the control valve 71, the electric motors 56, 89, 91, the raising / lowering control means, the rolling control means, and the leveling control means, and this item [5] and [7] [9 [ 10] is performed.

  When the elevating lever 92 is operated to the raised position (step S1), the planting and fertilizing clutches 87 and 90 are operated to the disconnected state (steps S2 and S3), and the leveling device 53 is operated to the retracted position A3 (step S4). When the leveling control means, the lifting control means and the rolling control means are stopped (steps S5, S6, S7), the hydraulic cylinder 4 is contracted and the seedling planting device 5 is raised (steps S8, S9). When the seedling planting device 5 reaches the upper limit position of the link mechanism 3 (step S10), the hydraulic cylinder 4 stops and the seedling planting device 5 stops at the upper limit position (step S11).

  When the elevating lever 92 is operated to the neutral position (step S1), the planting and fertilizing clutches 87 and 90 are operated to the disconnected state (steps S2 and S3), and the leveling device 53 is operated to the retreat position A3 (step S4). In a state where the leveling control means, the elevation control means and the rolling control means are stopped (steps S5, S6, S7), the hydraulic cylinder 4 is stopped and the raising / lowering of the seedling planting device 5 is stopped (steps S8, S11). .

  When the elevating lever 92 is operated to the lowered position (step S1), the planting and fertilizing clutches 87 and 90 are operated to the disconnected state (steps S2 and S3), and the leveling device 53 is operated to the retracted position A3 (step S4). Then, with the leveling control means, the lifting control means and the rolling control means stopped (steps S5, S6, S7), the hydraulic cylinder 4 is extended and the seedling planting device 5 is lowered (steps S8, S12). When the center float 9 contacts the surface G (step S13), the lifting control means and the rolling control means are activated (steps S18, S19).

  When the elevating operation lever 92 is operated to the planting position (step S1), the planting and fertilization clutches 87 and 90 are operated to the transmission state (steps S14 and S15), and the leveling device 53 is operated to the work position A4 (step S16). ), The leveling control means, the elevation control means and the rolling control means are activated (steps S17, S18, S19).

[6]
Next, the structure of the raising / lowering control means of the seedling planting apparatus 5 will be described.
As shown in FIGS. 2, 5, and 8, the support shaft 41 is rotatably supported around the horizontal axis P <b> 4 at the bottom of the transmission case 6, and the support arm 41 a fixed to the support shaft 41 extends obliquely rearward and downward. The rear portions of the center float 9 and the side float 11 are swingably supported up and down around the horizontal axis P5 at the rear end of the support arm 41a. As shown in FIGS. 3 and 8, an artificially operable planting setting height lever 42 is fixed to the support shaft 41 and extends forward and upward, and a lever guide 43 fixed to the support frame 18. In addition, a planting setting height lever 42 is inserted.

  As shown in FIGS. 5 and 8, the support shaft 41 and the support arm 41 a are rotated by the planting setting height lever 42, and the horizontal axis P <b> 5 (center float 9 and side float 11) is moved up and down. By changing, the setting height A1 (setting depth) described later can be changed. By engaging the planting setting height lever 42 with the lever guide 43, the horizontal axis P5 (center float) 9 and the side float 11) can be fixed, and the set height A1 (set depth) can be set.

  As shown in FIG. 8, a potentiometer 44 that detects the angle of the support shaft 41 is fixed to the support frame 18, and a detection value of the potentiometer 44 is input to the control device 40. By detecting the angle of the support shaft 41 with the potentiometer 44, the position of the horizontal axis P5 (center float 9 and side float 11) can be detected. As described above, the planting setting height lever 42 When the set height A1 (set depth) is set by the control device 40, the set height A1 (set depth) is recognized by the control device 40 based on the detection value of the potentiometer 44 (described in [7] described later and FIG. 10). Step S21).

  As shown in FIGS. 5 and 8, a bracket 45 is fixed to the support frame 18 above the center float 9, and a potentiometer 68 is fixed to the bracket 45, and the detection arm 68 a of the potentiometer 68 and the front part of the center float 9 The rod 69 is connected over the. A spring 86 that biases the detection arm 68a of the potentiometer 68 downward is provided, and the front portion of the center float 9 is biased downward by the spring 86, and the detection value C1 of the potentiometer 68 is input to the control device 40. ing. An artificially operable dial type sensitivity setting switch 70 is provided, and an operation position of the sensitivity setting switch 70 is input to the control device 40.

  The state shown in FIG. 5 and FIG. 8 is a state in which the position of the horizontal axis P5 (center float 9 and side float 11) is set by the planting setting height lever 42, and based on the detection value of the potentiometer 44, This is a state in which a set height A1 (set depth) corresponding to the position of the shaft core P5 (center float 9 and side float 11) is set. In this state, for example, the detection value C1 of the potentiometer 68 where the bottom surface of the center float 9 is horizontal is set as the set detection value B1 corresponding to the set height A1 (set depth).

[7]
Next, the operation of the lifting control means of the seedling planting device 5 (previous item [5] and step S18 in FIG. 9) will be described based on FIG.
As shown in the preceding item [6] and FIG. 8, the set height A1 (set depth) is recognized by the control device 40 based on the detected value of the potentiometer 44 (step S21), and corresponds to the set height A1 (set depth). The set detection value B1 to be set is set (step S22).

  As shown in FIGS. 5 and 8, the center float 9 follows the ground surface G while the seedling planting device 5 moves up and down, and accordingly, seedling planting from the field surface G (center float 9). The height to the device 5 (planting depth of the seedling by the planting arm 8) tends to change. As a result, the height from the rice field G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is detected by the potentiometer 68 (step S26), and the set detection value B1 A difference E1 between (the set height A1 (set depth)) and the detected value C1 of the potentiometer 68 is detected (step S27).

When the height from the field G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is higher than the set height A1 (set depth) (step S28), The hydraulic cylinder 4 is extended and the seedling planting device 5 is lowered (step S29).
When the height from the rice field G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is the same height as the set height A1 (set depth) (step S28) ), The hydraulic cylinder 4 stops, and the raising and lowering of the seedling planting device 5 stops (step S30).
When the height from the surface G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is lower than the set height A1 (set depth) (step S28), The hydraulic cylinder 4 is contracted to raise the seedling planting device 5 (step S31).

  As described above, the hydraulic cylinder 4 is extended and contracted to raise and lower the seedling planting device 5 so that the detection value C1 of the potentiometer 68 becomes the set detection value B1 (set height A1 (set depth)). Then, the planting depth of the seedling by the seedling planting device 5 (planting arm 8) is maintained at the set depth (height from the rice field G (center float 9) to the seedling planting device 5 (planting arm). 8) is maintained at the set height A1 (set depth)) (elevation control means).

  As shown in FIGS. 5 and 8, when the position of the horizontal axis P5 (center float 9 and side float 11) is changed by the planting setting height lever 42, a new setting height A1 (setting depth) is set. (Step S21). Along with this, based on the detection value of the potentiometer 44, for example, the detection value C1 of the potentiometer 68 in which the bottom surface of the center float 9 is horizontal corresponds to the new set height A1 (set depth) described above. This is set as the set detection value B1 (step S22), whereby the seedling planting depth by the seedling planting device 5 (planting arm 8) can be changed.

  In this case, the set detection value B1 (set height A1 (set depth)) can be slightly changed by the sensitivity setting switch 70. When the sensitivity setting switch 70 is operated to the neutral position N between the sensitive side and the insensitive side (step S23), the setting detection value B1 (setting height A1 (setting depth)) is not changed (planting setting). With the position of the horizontal axis P5 (center float 9 and side float 11) set by the height lever 42, the set detection value B1 (setting) corresponding to the position of the horizontal axis P5 (center float 9 and side float 11) State in which height A1 (set depth)) is set).

  When the sensitivity setting switch 70 is operated from the neutral position N to the sensitive side (step S23), the setting detection value B1 (setting height A1 (setting depth)) shown in FIG. 8 corresponds to the operating position of the sensitivity setting switch 70. Is slightly changed to a lower side (step S24). 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 contact area of the center float 9 to the surface G increases, and the center float 9 becomes the surface. Since it comes to follow G sensitively, the raising / lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be sensitive.

  When the sensitivity setting switch 70 is operated from the neutral position N to the insensitive side (step S23), the setting detection value B1 (setting height A1 (setting depth)) shown in FIG. 8 corresponds to the operating position of the sensitivity setting switch 70. Is slightly changed to a higher side (step S25). Thereby, the bottom surface of the center float 9 at the set height A1 (set depth) is slightly upward, the contact area of the center float 9 to the surface G is reduced, and the center float 9 follows the surface G insensitively. Therefore, the raising / lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be insensitive.

[8]
Next, the structure of the rolling control means of the seedling planting device 5 will be described.
As shown in the description in [1] and FIG. 3, 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 is the rear part of the link mechanism 3. It is supported so as to be able to roll around the lower front and rear axis P1). As shown in FIGS. 3 and 8, the tilt sensor 48 is fixed to the feed case 17, and the tilt angle in the left-right direction of the seedling planting device 5 with respect to the horizontal plane (field G) is detected by the tilt sensor 48. The detection value C2 of the sensor 48 is input to the control device 40.

  As shown in FIG. 3, a rolling mechanism 46 is provided at the upper rear portion of the link mechanism 3. The rolling mechanism 46 is a pair of wires 46a that are pushed and pulled in the left-right direction, and a gear mechanism that pushes and pulls the wires 46a. (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 the preceding item [1] and FIG. 3, the right or left spring 47 is extended as the seedling setting table 10 is driven to reciprocate laterally, and the seedling setting table 10 is moved to the right. When driven laterally (left), the right (left) spring 47 is stretched, and the urging force of the right (left) spring 47 causes the seedling planting device 5 to tilt to the right (left). It can be suppressed.

[9]
Next, the operation of the rolling control means of the seedling planting device 5 (previous item [5] and step S19 in FIG. 9) will be described based on FIG.
An inclination angle in the left-right direction of the seedling planting device 5 with respect to the horizontal plane (field G) is detected by the inclination sensor 48 (step S41), and a difference E2 between the horizontal plane (field G) and the detection value C2 of the inclination sensor 48 is detected. (Step S42).

  When the seedling planting device 5 is displaced from the horizontal plane (field G) to the right-inclined side (step S43), the electric motor 46b of the rolling mechanism 46 is operated, and the wire 46a of the rolling mechanism 46 is pushed and pulled. The seedling planting device 5 rolls to the left (step S47). In this case, when the difference E2 (absolute value) between the horizontal plane (field G) and the detected value C2 of the inclination sensor 48 is smaller than the set value E3 (step S44), the leveling device 53 is operated to the work position A4. (Step S45), the seedling planting device 5 rolls to the left (Step S47).

  When the difference E2 (absolute value) between the horizontal plane (field G) and the detected value C2 of the inclination sensor 48 is larger than the set value E3 (step S44), the right side of the leveling device 53 is in a state where it has entered the field G greatly. The leveling device 53 is operated to the retreat position A3 (step S46), and the seedling planting device 5 rolls to the left (step S47). Thus, by operating the leveling device 53 to the retreat position A3, a state where mud on the surface G is pushed by the right side portion of the leveling device 53 is avoided.

  When the seedling planting device 5 is displaced from the horizontal plane (field G) to the left inclined side (step S43), the electric motor 46b of the rolling mechanism 46 is operated, and the wire 46a of the rolling mechanism 46 is driven to be pulled and pulled. The seedling planting device 5 rolls to the right (step S51). In this case, when the difference E2 (absolute value) between the horizontal plane (field G) and the detection value C2 of the inclination sensor 48 is smaller than the set value E3 (step S48), the leveling device 53 is operated to the work position A4. (Step S49), the seedling planting device 5 rolls to the right (Step S51).

  When the difference E2 (absolute value) between the horizontal plane (table surface G) and the detected value C2 of the inclination sensor 48 is larger than the set value E3 (step S48), the left side of the leveling device 53 is in a state where it has entered the surface G greatly. Therefore, the leveling device 53 is operated to the retreat position A3 (step S50), and the seedling planting device 5 rolls to the right (step S51). Thus, by operating the leveling device 53 to the retreat position A3, a state in which the mud on the surface G is pushed by the left side portion of the leveling device 53 is avoided.

When the seedling planting device 5 has the same inclination angle as the horizontal plane (field G) (step S43), the rolling of the seedling planting device 5 is stopped while the leveling device 53 is operated to the work position A4 (step S52). (Step S53).
As described above, the seedling planting device 5 is maintained horizontally (maintained parallel to the rice field G in the left-right direction).

[10]
Next, the operation of the leveling control means of the leveling device 53 (previous item [5] and step S17 in FIG. 9) will be described based on FIG.
As shown in FIG. 8, an artificially operable dial-type leveling setting switch 84 (corresponding to the changing means) is provided, and the operation position of the leveling setting switch 84 is input to the control device 40, and the leveling setting is performed. The leveling set height A2 (leveling depth) can be arbitrarily set by operating the switch 84 (step S61).

  In this case, as shown in FIG. 8, the upper limit position A4U is set at the upper position (shallow leveling depth) and the lower limit position A4D is set at the lower position (depth leveling side) with the work position A4 as the center position. By operating the leveling setting switch 84, the leveling setting height A2 (leveling depth) can be arbitrarily set and changed in the range of the upper limit and lower limit positions A4U and A4D with the work position A4 as the center position. Can do.

  In the state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, if the sensitivity setting switch 70 is operated to the neutral position N in the middle of the sensitive side and the insensitive side, it is set by the leveling setting switch 84. The set leveling height A2 (leveling depth) is maintained (step S62).

  If the sensitivity setting switch 70 is operated from the neutral position N to the sensitive side in the state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, as shown in [7] above and step S24 in FIG. In addition to setting detection value B1 (setting height A1 (setting depth)) being slightly lowered and setting the raising and lowering of seedling planting device 5 by hydraulic cylinder 4 to be sensitive, leveling setting Height A2 (leveling depth) is changed to a slightly higher side (state where the leveling depth of leveling device 53 becomes shallow) (steps S62 and S63).

  In the state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, when the sensitivity setting switch 70 is operated from the neutral position N to the insensitive side, as in the previous item [7] and step S25 in FIG. In addition to the setting detection value B1 (setting height A1 (setting depth)) being changed to a slightly higher side and raising and lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be insensitive, the leveling setting The height A2 (leveling depth) is slightly changed to a lower side (state where the leveling depth of the leveling device 53 becomes deeper) (steps S62 and S64).

As shown in FIG. 8, the leveling device 53 is positioned at the work position A4 and the lift control means and the rolling control means are activated (the detection value C1 of the potentiometer 68 is the set detection value B1 (set height A1 (set depth The height from the rice field G (center float 9) to the seedling planting device 5 (the seedling planting depth by the planting arm 8) is set to the set height A1 (set depth). In the state where the seedling planting device 5 moves up and down and rolls so that the seedling planting device 5 is kept horizontal), the potentiometer 74 detects the height of the leveling device 53 relative to the seedling planting device 5. The height from the surface G to the leveling device 53 is calculated by the control device 40.
As a result, the electric motor 56 is operated so that the height from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61) becomes the leveling set height A2 (leveling depth). The device 53 moves up and down with respect to the seedling planting device 5 (leveling control means) (step S73).

  As shown in the preceding item [7] and FIG. 10, the position of the horizontal axis P5 (center float 9 and side float 11) is changed by the planting setting height lever 42 (seedling planting device 5 (planting arm 8). When the planting depth of the seedling is changed) and a new set detection value B1 (set height A1 (set depth)) is set, the detection value C1 of the potentiometer 68 becomes the new set detection value B1. The height from the rice field G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is new so as to be (set height A1 (set depth)). The seedling planting device 5 is moved up and down by the hydraulic cylinder 4 so as to reach the set height A1 (set depth). Along with this, the height from the surface G to the leveling device 53 changes.

  In this case, as shown in FIG. 8, in the state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61). When the height changes, based on the detection value of the potentiometer 44, the leveling device 53 (for example, the axis of the drive shaft 61) from the surface G corresponding to the new setting detection value B1 (setting height A1 (setting depth)). The electric motor 56 is operated and operated by the control device 40 so that the height up to the position) becomes the leveling set height A2 (leveling depth), and the leveling device 53 moves up and down with respect to the seedling planting device 5. (Level control means) (Step S73).

  As shown in FIG. 8, when the set detection value B1 (set height A1 (set depth)) is changed to the upper side (the seedling planting device 5 (planting arm 8)), the seedling planting depth is shallow. The position of the leveling device 53 is changed downward with respect to the seedling planting device 5, and the height from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61) is increased. The leveling set height A2 (leveling depth) is maintained. When the set detection value B1 (set height A1 (set depth)) is changed to the lower side (when the seedling planting depth by the seedling planting device 5 (planting arm 8) is changed to the deep side. ), The position of the leveling device 53 is changed upward with respect to the seedling planting device 5, and the height from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61) is the leveling set height A2 ( Leveling depth).

[11]
In the state of the previous item [10], the following restrictions are applied to the setting of the leveling set height A2 (leveling depth) by the leveling setting switch 84 based on the set height A1 (set depth). Next, this limitation will be described.
As shown in FIGS. 2 and 8, the support arm 41a fixed to the support shaft 41 extends obliquely rearward and downward, and the center float 9 and the side are arranged around the horizontal axis P5 at the rear end of the support arm 41a. The rear portion of the float 11 is supported so as to be swingable up and down. A transmission case 81 and a support frame 83 are supported swingably up and down around the horizontal axis P2 (the horizontal axis P2 of the transmission shaft 23 and the input shaft 32) and extend obliquely forward and downward.

  As shown in FIG. 8, the position of the horizontal axis P <b> 5 (center float 9 and side float 11) by the planting setting height lever 42 (planting depth of seedlings by the seedling planting device 5 (planting arm 8)). When the position of the horizontal axis P5 (center float 9 and side float 11) is changed (set) downward (seedling planting depth by the seedling planting device 5 (planting arm 8)) When it is changed (set) to the shallow side), the horizontal axis P5 (center float 9 and side float 11) is moved downward and forward by the support arm 41a of the support shaft 41, and the center float 9 and side float 11 front parts approach the leveling device 53.

  As shown in FIG. 8, when the position of the horizontal axis P5 (center float 9 and side float 11) is changed (set) upward (planting depth of seedlings by the seedling planting device 5 (planting arm 8)) Is changed (set) to a deeper side), the horizontal axis P5 (center float 9 and side float 11) is moved upward and rearward by the support arm 41a of the support shaft 41, and the center float 9 and The front part of the side float 11 is separated from the leveling device 53.

  As shown in FIG. 8, when the leveling set height A2 (leveling depth) is changed to the low side (state where the leveling depth of the leveling device 53 becomes deep) by the leveling setting switch 84, the transmission case 81 and the support frame 83 are moved. The ground leveling device 53 approaches the front part of the center float 9 and the side float 11 as it moves downward and rearward. When the leveling setting height A2 (leveling depth) is changed to the high side (state where the leveling depth of the leveling device 53 becomes shallow) by the leveling setting switch 84, the transmission case 81 and the support frame 83 move upward and forward. Thus, the leveling device 53 approaches the support frames 18 and 52.

  As shown in FIG. 8, planting of seedlings by the range change position of the horizontal axis P5 (center float 9 and side float 11) by the planting setting height lever 42 (seedling planting device 5 (planting arm 8)) In the depth change range), the horizontal axis P5 (the center float 9 and the side float 11) has an intermediate position in the change range (seedling planting device 5 (planting arm 8)). When set to (intermediate position) (step S65), the setting of the leveling set height A2 (leveling depth) by the leveling setting switch 84 is not limited, and the upper limit and lower limit positions A4U and A4D are not changed (upper limit and The lower limit positions A4U and A4D are returned to the original positions shown in FIG. 8) (step S66).

  As shown in FIGS. 8 and 13 (a), when the position of the horizontal axis P5 (center float 9 and side float 11) is changed (set) downward from the middle position of the change range (seedling planting device 5). (When the planting depth of the seedling by the planting arm 8 is changed (set) from the middle position of the change range to the shallow side) (step S65), the horizontal axis P5 (center float 9 and side float 11) Depending on the position (planting depth of the seedling by the seedling planting device 5 (planting arm 8)), the lower limit position A4D is changed upward (the working position A4 side) (corresponding to the limiting means) (step S67). (Corresponding to the first, second and third features of the present invention (corresponding to claims 1, 2 and 3)).

  Accordingly, as shown in FIG. 13A, when the leveling set height A2 (leveling depth) is set below the lower limit position A4D (step S68), the leveling set height A2 (leveling depth). ) Is changed to the lower limit position A4D (the lower limit position A4D is set as the leveling set height A2 (leveling depth)) (step S69), the process proceeds to step S73. Thus, by changing the leveling set height A2 (leveling depth) to the upper side (working position A4 side), the state where the leveling device 53 approaches the front part of the center float 9 and the side float 11 is avoided.

  As shown in FIGS. 8 and 13 (b), when the position of the horizontal axis P5 (center float 9 and side float 11) is changed (set) upward from the middle position of the change range (seedling planting device 5). (When the planting depth of the seedling by the planting arm 8 is changed (set) from the middle position of the change range to the deep side) (step S65), the horizontal axis P5 (center float 9 and side float 11) Depending on the position (planting depth of seedlings by the seedling planting device 5 (planting arm 8)), the upper limit position A4U is changed to the lower side (working position A4 side) (corresponding to the limiting means) (step S70). (Corresponding to the first, second and fourth features of the present invention (corresponding to claims 1, 2 and 4)).

  Thus, as shown in FIG. 13B, when the leveling set height A2 (leveling depth) is set above the upper limit position A4U (step S71), the leveling set height A2 (leveling depth) ) Is changed to the upper limit position A4U (the upper limit position A4U is set as the leveling set height A2 (leveling depth)) (step S72), and the process proceeds to step S73. Thus, by changing the leveling set height A2 (leveling depth) to the lower side (working position A4 side), the state where the leveling device 53 approaches the support frames 18 and 52 is avoided.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], instead of [11] in the previous section and steps S62, S63, and S64 in FIG. 12, the following configuration may be used (the previous section [11] and FIG. The following configuration may be added to the 12 steps S61 to S73).

  The rod 58, the transmission case 81, and the support frame 83 shown in FIG. 2 are provided with load sensors (corresponding to load detection means) (not shown), and the load applied to the leveling device 53 from the surface G is detected by the load sensors. When the detected value of the load sensor becomes larger than the set value, the leveling set height A2 (leveling depth) is changed upward. When the detected value of the load sensor becomes smaller than the set value, the leveling set height A2 (leveling depth) Is changed downward (corresponding to the adjusting means) (corresponding to the fifth feature of the present invention (claim 5)).

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], instead of [11] in the previous section and steps S62, S63, and S64 in FIG. 12, the following configuration may be used (the previous section [11] and FIG. The following configuration may be added to the 12 steps S61 to S73).

  A speed sensor (corresponding to speed detecting means) for detecting the traveling speed of the aircraft is provided. When the detection value of the speed sensor becomes larger than the set value, the leveling set height A2 (leveling depth) is changed upward, and when the value detected by the speed sensor becomes smaller than the set value, the leveling set height A2 (leveling depth) Is changed downward (corresponding to the adjusting means) (corresponding to the sixth feature of the present invention (claim 6)).

[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] [Second Alternative Embodiment of the Invention], the following configuration may be used instead of FIG. .

  As shown in FIG. 14, the transmission system is branched from between the engine 49 and the hydrostatic continuously variable transmission 73 (corresponding to the upper transmission side of the transmission for traveling and the transmission for paddy field work) This transmission system is provided with a leveling gear 92 (corresponding to a gearing for the leveling device) and a leveling clutch 93 so that power is transmitted to the leveling device 53 via the leveling gear 92 and the leveling clutch 93 ( (Seventh feature of the present invention (corresponding to claim 7)).

  As a result, the leveling device 53 (the drive shaft 61 and the rotating body 62) is driven at a constant rotational speed without being affected by the hydrostatic continuously variable transmission 73 and the inter-shaft transmission 85, and the leveling transmission By operating 92, the rotation speed of the leveling device 53 (the drive shaft 61 and the rotating body 62) can be set to an arbitrary value. The leveling device 53 can be operated and stopped without being influenced by the planting clutch 87 by independently operating the leveling clutch 93 to the transmission and disconnection state.

[Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Third Alternative Embodiment of the Invention], steps [23] and steps S23, S24, and S25 of FIG. It may replace with and may be comprised as follows.

When the leveling set height A2 (leveling depth) is set at the work position A4 (center position), the set detection value B1 (set height A1 (set depth)) is not changed.
If the leveling set height A2 (leveling depth) is changed from the work position A4 (center position) to the upper side (the shallow side of the leveling depth) by the leveling setting switch 84, the set detection value B1 (set height A1 ( The bottom surface of the center float 9 at the set depth)) is slightly downward, the contact area of the center float 9 to the surface G increases, and the center float 9 follows the surface G in a sensitive manner. The raising / lowering of the seedling planting device 5 by 4 is set to be sensitive.

  When the leveling setting switch 84 changes the leveling set height A2 (leveling depth) from the work position A4 (center position) to the lower side (the side where the leveling depth is deeper), the set height A1 (set depth) is reached. The bottom surface of the center float 9 is slightly upward, the contact area of the center float 9 with the surface G is reduced, and the center float 9 follows the surface G insensitively. 5 is set to be insensitive.

[Fifth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of Invention] to [Fourth Alternative Embodiment of Invention], the planting setting height lever 42 is abolished and shown below. You may comprise as follows.

  As shown in FIG. 15, a support arm 94 is supported around the horizontal axis P <b> 6 of the transmission case 6 behind the support shaft 41 so as to be swingable up and down, and spans between the support arm 41 a and the support arm 94 of the support shaft 41. The link 95 is connected, and the parallel quadruple link mechanism is configured by the support arm 41 a of the support shaft 41, the support arm 94, and the link 95. Around the horizontal axis P5 of the support arm 94, the rear portions of the center float 9 and the side float 11 are supported so as to be swingable up and down.

  As shown in FIG. 15, a fan-shaped elevating gear 97 is swingably supported around the horizontal axis P7 of the frame 96 fixed to the transmission case 6, and the support arm 41a of the support shaft 41 and the link 95 are supported. A link 98 is connected across the connection point and the lifting gear 97, and an electric motor 99 that swings and drives the lifting gear 97 is fixed to the frame 96.

  Thereby, the electric motor 99 is operated via the control device 40 by operating a steering handle (not shown) or a planting setting height dial (not shown) provided near the driver's seat 31. The support arm 94 is operated up and down via the elevating gear 97 and the link 98, and the set detection value B1 (set height A1 (set depth)) is set.

[Sixth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Fifth Alternative Embodiment of the Invention], as a paddy field work device, paste-like fertilizer is supplied to the rice field. You may provide a fertilizer application apparatus, a direct sowing apparatus, a chemical spraying apparatus, a rice bran spraying apparatus, etc. Instead of supporting the leveling device 53 on the paddy field working device (seed planting device 5), the leveling device 53 may be supported by a link mechanism (not shown) extended from the rear of the machine body. .

Overall side view of riding rice transplanter Side view of seedling planting device and leveling device Front view of seedling planting device and leveling device Top view of seedling planting device and leveling device Side view of the front of the leveling device and center float Whole perspective view of rotating body of leveling device The figure which shows the transmission system from an engine to a front wheel and a rear wheel, a seedling planting device, a feeding part, and a leveling device The figure which shows the cooperation state of a control apparatus and each part The figure which shows the flow of the raising / lowering of the seedling planting device and leveling device by the raising / lowering operation lever The figure which shows the flow of an operation | movement of a raising / lowering control means. The figure which shows the flow of an operation | movement of a rolling control means. The figure which shows the flow of operation of leveling control means The figure which shows the state where the restriction was added to the setting of the leveling setting height (leveling depth) by the leveling setting switch The figure which shows the transmission system from an engine to a front wheel and a rear wheel, a seedling planting apparatus, a delivery part, and a leveling apparatus in 3rd another form of implementation of invention. The side view of the vicinity of the center float in the fifth alternative embodiment of the invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Link mechanism 5 Paddy field work device 53 Leveling device 56,84 Change means 62 Rotating body 73,76 Traveling transmission device 85 Transmission device for paddy field work device 92 Transmission device for leveling device G

Claims (7)

Support the paddy field work device to be raised and lowered via a link mechanism at the rear of the machine body, and support the leveling device to be raised and lowered between the paddy field work apparatus and the machine body,
A change means that can freely change the height of the leveling device relative to the paddy field work device or the machine body,
The paddy field machine provided with the restriction | limiting means which restrict | limits the height change of the leveling apparatus by the said change means according to the height of the said paddy field working apparatus with respect to a body.   When the height of the paddy field work device with respect to the machine body is set above or below the lifting range, the limiting means is configured so that the range of height change of the leveling device by the changing means is limited to the narrow side. The paddy field machine according to claim 1.   When the height of the paddy field work device with respect to the machine body is set above the lifting range, the change means restricts the change of the height of the leveling device to the lower side, whereby the height of the leveling device by the change means is reduced. The paddy field work machine according to claim 2, wherein the restriction means is configured so that a range of change in height is restricted to a narrow side.   When the height of the paddy field working device with respect to the machine body is set below the lifting range, the change means restricts the change of the height of the leveling device to the upper side. The paddy field work machine according to claim 2 or 3, wherein the restricting means is configured so that a range of change in height is restricted to a narrow side. Comprising load detecting means for detecting a load applied to the leveling device from the surface,
When the detection value of the load detection means increases, the height of the leveling device relative to the paddy field work device or machine body is changed upward, and when the detection value of the load detection means decreases, the leveling device of the paddy field work device or machine body The paddy field work machine according to any one of claims 1 to 4, further comprising adjusting means for changing the height downward. Equipped with speed detection means for detecting the traveling speed of the aircraft,
When the detection value of the speed detection means increases, the height of the leveling device with respect to the paddy field work device or machine body is changed upward, and when the detection value of the speed detection means decreases, the leveling device for the paddy field work device or machine body The paddy field work machine according to any one of claims 1 to 4, further comprising adjusting means for changing the height downward. The ground leveling device is configured with a rotating body that is rotationally driven by power to level the field,
The transmission system for the leveling device is branched from the transmission side of the transmission for traveling and the transmission for the paddy field working device, and the power is transmitted to the leveling device via the transmission system for the leveling device. ,
The paddy field work machine according to any one of claims 1 to 6, wherein a transmission for the leveling device is provided in the transmission system for the leveling device.

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