JP5960416B2 - Rice transplanter - Google Patents

Description

  The present invention relates to a rice transplanter.

  The rice transplanter includes a traveling unit and a planting unit connected to the traveling unit. The traveling unit includes a power source, and the planting unit includes a planting mission case, planting claws, and a seedling stage. The planting claw is rotatably attached to the planting mission case. The power source is connected to the planting mission case via a power transmission mechanism, so that the planting claws can be rotated by power from the power source.

  The planting mission case is provided with a clutch mechanism (planting clutch). The planting claw rotates when the planting clutch is brought into a connected state by operation of an operation lever, and stops when the planting clutch is brought into a disconnected state. When the planting clutch is shifted from the connected state to the disconnected state, the planting claw is stopped at a predetermined upper position so that the planting claw does not stop rotating at a position where the planting claw contacts the field scene or the seedling mount. The power transmission is interrupted while rotating to a position (reference position) (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 60-21929

  By the way, there is also a rice transplanter configured such that the planting clutch shifts from a connected state to a disconnected state in accordance with the ascending operation of the planting unit. In the case of this configuration, for example, when changing the direction of the rice transplanter after performing planting work to the vicinity of the end of the field, if the planting part is raised while moving the rice transplanter, the planting clutch is Power transmission is cut off while the planting claw is rotated to the upper stop position. At this time, if the planting claw has already taken out the seedling from the seedling mat on the seedling platform, the seedling held by the planting claw is released while being rotated to the upper stop position. The seedling throwing operation will be performed. At the time of this seedling discarding operation, the planting part is lifted from the farm scene, so that the seedling released by the planting claws is floated on the farm scene (water surface) without being planted in the farm field.

  In the present invention, when the power transmission to the planting claw is cut off, the planting claw is turned to the upper stop position and when the power transmission to the planting claw is cut off, It aims at providing the rice transplanter which can select the state which is not rotated from the position of.

The rice transplanter according to the present invention includes a traveling unit, a planting unit, a planting clutch, and a transmission clutch.
And an interlocking mechanism and a check mechanism . The traveling unit has a power source. The planting part has a planting claw and is connected to the traveling part so as to be movable up and down. The said planting claw is comprised so that it may take out a seedling from the seedling mat on a seedling stand, and may be planted in a farm field, moving while motive power is transmitted from the said power source. The planting clutch is configured to be able to transmit power to the planting claw at the time of connection, while being configured to be cut off at the time of disconnection, and when switching from the connected state to the disconnected state, from the start to the end of the cutting operation. In the meantime, the planting claw is configured to be able to transmit power to the planting claw so that the planting claw moves to its reference position. The transmission clutch is disposed upstream of the planting clutch in the power transmission path of the power transmission path from the power source to the planting claw, and transmits or blocks power from the power source to the planting claw. Switch. The interlocking mechanism operatively connects the planting clutch and the transmission clutch so that the transmission state of the transmission clutch is switched according to switching of the transmission state of the planting clutch. The check mechanism prohibits the operation of the interlocking mechanism so as to allow the transmission clutch to be in the clutch engaged state while the planting clutch remains in the clutch disengaged state.

According to the rice transplanter according to the present invention, when the power to the planting claw is cut off, it is possible to select whether to move the planting claw to the reference position or hold it at the current position. it can.
That is, the power to the planting claws is cut off by an interlocking mechanism that operatively connects the planting clutch and the transmission clutch so that the transmission state of the transmission clutch is switched according to switching of the transmission state of the planting clutch. When the transmission clutch is switched from the connected state to the disconnected state, the planting claws can be held at the position at that time.
On the other hand, a check mechanism that inhibits the action of the interlocking mechanism is allowed so as to allow the transmission clutch to be in the clutch engaged state while the planting clutch remains in the clutch disengaged state, thereby The planting clutch is disposed in a connected state with a transmission clutch that is arranged on the upstream side in the transmission direction from the planting clutch and that switches between transmission and shutdown of power from a power source to the planting claw. When the switch is switched from the connected state to the disconnected state, the planting claws can be moved to the reference position.

  For example, the planting clutch includes a drive-side clutch forming body provided on a drive shaft located on the upstream side in the transmission direction, and a driven-side clutch formed on a driven shaft disposed coaxially with the drive shaft. And a cam groove provided in the driven shaft or the clutch-forming body on the driven side, which receives the driving force from the actuator and connects the driven shaft to a predetermined position around the axis (that is, operatively connected to the driven shaft). And a cam groove that separates from the drive shaft while rotating the planting claw to a position where the planting claw is positioned at the upper stop position.

  Here, in order to reduce the size and cost of the actuator, preferably, the magnitude of the driving force of the actuator is such that the driven shaft is rotated around the axis by the driving shaft. Can be separated from the drive shaft while rotating the shaft to a predetermined position. However, when the drive shaft is stopped rotating, the driven shaft is rotated away from the drive shaft while rotating around the axis. It is set to such an extent that it cannot be made.

  Therefore, the drive shaft rotates when the transmission clutch is in the connected state, and the driven shaft rotates about the axis together with the drive shaft when the planting clutch is in the connected state. When a driving force is applied from the actuator to the driven shaft, the driven shaft is rotated away from the driving shaft while rotating to a predetermined position around the axis, thereby interrupting power transmission to the planting claw. While being done, the planting claw is rotated to the upper stop position.

On the other hand, when the transmission clutch is in a disconnected state substantially simultaneously with the cutting operation of the planting clutch or earlier than the cutting operation of the planting clutch, the cutting operation of the transmission clutch causes the The power transmission is interrupted, and at this time, the planting claw is fixed at the current position.
Even if the actuator applies a driving force to the driven shaft so as to shift the planting clutch to the disconnected state, the driving of the actuator is stopped when the driving shaft and the driven shaft are stopped as described above. The driven shaft cannot be separated from the drive shaft while rotating the driven shaft to a predetermined position around the axis by force alone. Therefore, the planting claw remains stopped at that position without being rotated to the upper stop position.

The side view which shows the structure of a rice transplanter. The side view which shows the structure of the planting nail vicinity. The figure which shows the power transmission structure of a rice transplanter. The figure which shows the motive power transmission structure in the transmission part between shares. The partial cross section figure which shows the structure of a part of transmission clutch and interlocking mechanism which are a cutting | disconnection state. The partial cross section figure which shows the structure of a part of transmission clutch and interlocking mechanism which are a connection state. The partial cross section figure which shows the structure of a part of transmission clutch and interlocking mechanism in the time of switching from a cutting | disconnection state to a connection state in response to the downward movement of a planting part. Sectional drawing which shows the structure of a planting clutch. The side view which shows the structure of the remaining part of the interlocking mechanism at the time of the descending of a planting part. The side view which shows the structure of the remaining part of the interlocking mechanism at the time of a raise of a planting part. The side view which shows the structure of the remaining part of the interlocking mechanism in the middle of the descent | fall of a planting part. Control block diagram. The figure which shows the modification of an accommodation mechanism. (A) The figure which shows the said accommodation mechanism in case a planting clutch is a connection state. (B) The figure which shows the said accommodation mechanism in case a planting clutch is a cutting | disconnection state.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings, identical reference numbers indicate corresponding or identical elements.

  First, a schematic configuration of the riding rice transplanter 100 will be described.

  As shown in FIGS. 1 and 2, the rice transplanter 100 includes a traveling unit 10 and a planting unit 50.

  The traveling unit 10 includes a body frame 11, a power source, a traveling mission unit 13, left and right front wheels 15, and left and right rear wheels 18.

  The body frame 11 is provided so as to extend in the vehicle body length direction (front-rear direction) and the vehicle body width direction (left-right direction) of the rice transplanter 100. The engine 12 as a power source is supported by the front end portion of the body frame 11 and is covered with a hood 30.

  The traveling mission unit 13 is disposed behind the engine 12 and supported by the front portion of the vehicle body frame 11. A left front axle case 17 is provided on the left side of the traveling mission unit 13. A right front axle case 17 is provided on the right side of the traveling mission unit 13.

  The left front wheel 15 is disposed on the left side of the traveling mission unit 13 and is attached to the left front axle case 17 via the front axle 16. The right front wheel 15 is disposed on the right side of the traveling mission unit 13 and is attached to the right front axle case 17 via the front axle 16.

  A rear axle case 20 is coupled to the rear portion of the traveling mission unit 13 via a pipe-shaped coupling body 21. The rear axle case 20 is disposed behind the traveling mission unit 13 and supported by the rear part of the vehicle body frame 11.

  The left rear wheel 18 is disposed on the left side of the rear axle case 20 and is attached to the left side portion of the rear axle case 20 via a rear axle 19. The right rear wheel 18 is disposed on the right side of the rear axle case 20 and is attached to the right side portion of the rear axle case 20 via a rear axle 19.

  Further, a cover body 31 is provided behind the bonnet 30 so as to cover the vehicle body frame 11 from above. The cover body 31 has a step, and is divided into a front half and a rear half with the step as a boundary. The second half part of the cover body 31 is arranged at a position higher than the first half part in the vertical direction of the rice transplanter 100.

  A driver's seat 32 is provided behind the hood 30 and above the cover body 31. The driver's seat 32 is disposed on the rear half of the cover body 31 so as to face the bonnet 30. The upper half of the cover body 31 serves as a footrest for a driver of the rice transplanter 100 seated in the driver's seat 32 or a passage for the driver.

  An operation unit 35 is provided at the upper end of the bonnet 30. The operation unit 35 includes a display unit, a steering wheel 36, a main transmission lever, an elevating operation member, and a planting operation member. The raising / lowering operation member is for raising and lowering the planting part 50, and the planting operation member is for driving the planting part 50. In this embodiment, although the said raising / lowering operation member and the said planting operation member are comprised as one operation lever 38, the structure is not specifically limited.

  The steering wheel 36 is disposed above the bonnet 30 and is rotatably provided via a support shaft. The operation lever 38 is disposed on the right side of the steering wheel 36 and is provided so as to be tiltable in a plurality of directions.

  As shown in FIG.1 and FIG.2, the planting part 50 is connected with the rear part of the traveling part 10 via the raising / lowering link mechanism 70 so that raising / lowering is possible to an up-down direction. The planting unit 50 includes a planting frame 51, a planting mission unit 52, an interlocking case 53, a plurality of planting cases 54, a plurality of rotary cases 55, a plurality of planting claws 56, and a seedling mount. 57 and a plurality of floats 58.

  The planting mission unit 52 is disposed in front of the planting unit 50 and supported by the planting frame 51. The interlocking case 53 is provided so as to extend in the left-right direction from the planting mission unit 52.

  The plurality of planting cases 54 are provided so as to extend in the front-rear direction, respectively, and are arranged at predetermined intervals in the left-right direction behind the interlocking case 53. The front end portions of the plurality of planting cases 54 are connected to the interlocking case 53.

  The plurality of rotary cases 55 are attached to the rear portion of each planting case 54 by two (for two strips). Each rotary case 55 is rotatably supported by a respective planting case 54 via a planting rotation shaft 137 extending in the left-right direction at the center thereof, and is rotatable about the planting rotation shaft 137.

  The plurality of planting claws 56 are attached to each rotary case 55 two by two. The two planting claws 56 are arranged at symmetrical positions around the rotational axis of the rotary case 55 and are rotatable about the axis in the left-right direction with respect to the rotary case 55. The two planting claws 56 move around the planting rotation shaft 137 when the rotary case 55 rotates around the planting rotation shaft 137.

  The seedling stage 57 is disposed above the plurality of planting cases 54 and attached to the planting frame 51. The seedling stage 57 is provided so as to extend in the vertical direction, and is configured to be capable of being laterally fed in the horizontal direction. The seedling placing table 57 is configured so that the seedling mat placed thereon can be vertically fed in the vertical direction.

  The plurality of floats 58 are provided so as to extend in the front-rear direction, respectively, and are arranged at predetermined intervals in the left-right direction below the plurality of planting cases 54. The plurality of floats 58 are supported by the planting frame 51 and the planting case 54 so as to be swingable in the vertical direction so as to follow the ground with respect to the farm scene (water surface) W of the farm field G.

  As shown in FIGS. 1 and 9, the elevating link mechanism 70 is for connecting the planting unit 50 to the traveling unit 10 so as to be movable up and down in the vertical direction, and between the traveling unit 10 and the planting unit 50. Is provided. The elevating link mechanism 70 includes an upper link 71, a lower link 72, an arm 73, an intermediate link 74, and an elevating actuator.

  The upper link 71 is provided so as to extend in the front-rear direction. A front end portion of the upper link 71 is connected to the vehicle body frame 11 of the traveling unit 10 so as to be rotatable about a horizontal axis. The rear end portion of the upper link 71 is connected to the planting frame 51 of the planting unit 50 so as to be rotatable about a horizontal axis.

  The lower link 72 is provided so as to extend forward and rearward, and is disposed below the upper link 71. The lower link 72 is arranged in parallel with the upper link 71. A front end portion of the lower link 72 is connected to the vehicle body frame 11 so as to be rotatable about an axis in the left-right direction. The rear end portion of the lower link 72 is connected to the planting frame 51 so as to be rotatable around a horizontal axis.

  The arm 73 is disposed between the upper link 71 and the lower link 72. The arm 73 is connected to the front end portion of the lower link 72 and is provided so as to protrude toward the upper link 71 side.

  The intermediate link 74 is provided so as to extend in the front-rear direction, and is disposed between the upper link 71 and the lower link 72. The front end portion of the intermediate link 74 is rotatably connected to the protruding end portion of the arm 73. The rear end portion of the intermediate link 74 is coupled to the front-rear midway portion of the lower link 72 so as to be rotatable about an axis in the left-right direction.

  In the present embodiment, the lifting actuator is a lifting cylinder 75, which is a hydraulic cylinder. The elevating cylinder 75 is disposed in front of the upper link 71 and the lower link 72 and supported by the body frame 11. The rod of the elevating cylinder 75 is connected to the projecting end portion of the arm 73 and the front end portion of the intermediate link 74 so as to be rotatable about a horizontal axis.

  When the planting part 50 is disposed in the lowest position or between the lowest position and the highest position in the vertical direction of the rice transplanter 100, when the lifting cylinder 75 is shortened, the upper link 71 and the lower link 72 are Each rear end is rotated so as to move upward. Thereby, the planting part 50 will raise from a present position.

  On the other hand, when the planting part 50 is disposed at the highest position or between the highest position and the lowest position in the vertical direction of the rice transplanter 100, when the lifting cylinder 75 extends, the upper link 71 and the lower link 72 rotates so that each rear-end part moves below. Thereby, the planting part 50 descends from the current position.

  In such a configuration, when the planting operation of the rice transplanter 100 is started, the operation lever 38 is operated by the operator, and the planting unit 50 is grounded to the farm scene W by the lifting link mechanism 70. And the power of the engine 12 is transmitted to the plurality of rotary cases 55 and the plurality of planting claws 56. As a result, each rotary case 55 rotates at a constant speed in one direction, and each planting claw 56 is driven.

  In this state, when the rice transplanter 100 starts traveling, the two planting claws 56 attached to the rotary case 55 respectively feed the seedlings of one line in the horizontal direction and vertically while each rotary case 55 makes one rotation. It is taken out from the seedling mat on the seedling stand 57 to be fed and planted in the field G that has been leveled by the float 58. During the movement of the rice transplanter 100, the planting is continuously performed and the planting operation is performed.

  Next, the power transmission structure of the rice transplanter 100 will be described.

  As shown in FIG. 3, the output shaft 81 of the engine 12 is connected to the input shaft 82 of the traveling mission unit 13 via a belt transmission mechanism. Here, the traveling mission unit 13 includes a hydrostatic continuously variable transmission 83, a front wheel transmission mechanism 84, a rear wheel transmission mechanism 85, and a power take-out mechanism 86.

  The hydrostatic continuously variable transmission 83 is connected to the input shaft 82 of the traveling mission unit 13. The front wheel speed change mechanism 84 is connected to the hydrostatic continuously variable transmission 83 via a gear mechanism and is connected to the left and right front wheels 15 via the front axle 16.

  The rear wheel transmission mechanism 85 is connected to the hydrostatic continuously variable transmission 83 through a gear mechanism, and is connected to the rear wheel transmission mechanism 88 in the rear axle case 20 through a rear axle transmission shaft 87. The rear wheel transmission mechanism 88 is connected to the left and right rear wheels 18 via the rear axle 19.

  The power take-off mechanism 86 is connected to the hydrostatic continuously variable transmission 83 via a gear mechanism and is connected to the transmission mechanism 90 via a first transmission shaft 91. The transmission mechanism 90 is disposed on the downstream side of the traveling transmission unit 13 in the power transmission path from the engine 12 to the planting unit 50 (the rotary case 55 and the planting claw 56), and the second transmission shaft 92 and the third transmission are arranged. The shaft 93 is connected to the input shaft 115 of the inter-company transmission unit 110.

  Here, the transmission mechanism 90 has a transmission clutch 140. The transmission clutch 140 is provided between the first transmission shaft (drive shaft) 91 and the second transmission shaft (driven shaft) 92 and is located further downstream of the power transmission path than the power take-off mechanism 86 of the traveling mission unit 13. The power to the planting part 50 located can be transmitted or cut off. The transmission clutch 140 is disposed on the downstream side of the power transmission path with respect to the traveling mission unit 13 and on the upstream side of the power transmission path with respect to a planting clutch 170 described later.

  As shown in FIG. 4, the inter-company transmission unit 110 includes an inter-company transmission mechanism 112, a planting clutch 170, and an external power take-out mechanism 113. This inter-strain shifting unit 110 is for adjusting the planting strains by shifting the power to the planting unit 50.

  The stock shifting mechanism 112 includes a plurality of gear trains including an input shaft 115, an output shaft 116, a counter shaft 117, and a slide shaft 118. The inter-company transmission mechanism 112 is connected to an inter-company transmission lever provided in the operation unit 35, and is configured to be able to change the gear position according to the operation.

  The input shaft 115 is provided so as to extend into and out of the inter-stock transmission case 114. The output shaft 116 is provided so as to extend in and out of the inter-stock transmission case 114 and is disposed on the same axis as the input shaft 115. The output shaft 116 is connected to the input shaft of the planting mission unit 52.

  The counter shaft 117 is arranged in parallel with the input shaft 115 and the output shaft 116, and is disposed so as to face the input shaft 115 and the output shaft 116. The slide shaft 118 is fitted on the output shaft 116 so as to be rotatable relative to the output shaft 116, and is disposed so as to face the counter shaft 117.

  Between the input shaft 115 and the counter shaft 117, a main transmission gear train having two high and low speeds among a plurality of gear trains is interposed. Between the output shaft 116 and the counter shaft 117, an auxiliary transmission gear train having three high and low speeds among the plurality of gear trains is interposed.

  The planting clutch 170 is provided between the slide shaft (drive shaft) 118 and the output shaft (driven shaft) 116, and is disposed on the downstream side of the power transmission path from the power take-off mechanism 86 (rotary shaft 50 (rotary shaft). The power to the case 55 and the planting claw 56) can be transmitted or cut off. That is, in the power transmission structure, two clutches, the planting clutch 170 and the transmission clutch 140, are provided between the engine 12, the traveling mission unit 13, and the planting unit 50.

  In the external power take-out mechanism 113, the transmission shaft 121 is connected to the input shaft 115 and the output shaft 122 is connected to the transmission shaft 121. The output shaft 122 is provided so as to protrude from the inside of the inter-stock transmission case 114 to the outside. An external device (for example, a fertilizer application device) attached to the rice transplanter 100 can extract power from the output shaft 122.

  The input shaft of the planting mission unit 52 is connected to a plurality of transmission shafts 135 through a transmission mechanism. As shown in FIG. 2, each transmission shaft 135 is provided in each planting case 54 and is connected to a planting rotation shaft 137 of the rotary case 55. The planting rotary shaft 137 of the rotary case 55 is connected to the drive shaft of the planting claw 56.

  With such a configuration, in the power transmission structure, power from the engine 12 can be transmitted to the front wheel 15 after being transmitted to the traveling mission unit 13. Further, after the power of the engine 12 is transmitted to the traveling mission unit 13, it can be transmitted to the rear wheel 18 and can be transmitted to the planting unit 50. When the power of the engine 12 is transmitted to the planting unit 50, it can be transmitted from the planting mission unit 52 to the plurality of rotary cases 55 and the plurality of planting claws 56.

  In the present embodiment, two clutches, that is, the transmission clutch 140 and the planting clutch 170 are provided between the traveling mission unit 13 and the planting mission unit 52. Therefore, if the two clutches are both connected, the power of the engine 12 is transmitted to the rotary cases 55 and the planting claws 56 of the planting unit 50, while at least one of the two clutches is in a disconnected state. If so, the power of the engine 12 is not transmitted to the rotary cases 55 and the planting claws 56.

  Next, the transmission clutch 140 of the transmission mechanism 90 will be described.

  As shown in FIGS. 5, 6, and 7, the transmission clutch 140 is constituted by a mechanical clutch (claw clutch) in this embodiment, and is accommodated in the transmission clutch case 145. The transmission clutch case 145 is provided near the side of the traveling mission unit 13. However, the transmission clutch case 145 may be configured integrally with the inter-company transmission case 114 of the inter-company transmission unit 110.

  In this embodiment, the transmission clutch 140 includes a transmission clutch main body having a first clutch formation body (drive side clutch formation body) 141 and a second clutch formation body (driven side clutch formation body) 142, and a transmission clutch biasing member. 143. The transmission clutch 140 is provided between the first transmission shaft (drive shaft) 91 and the second transmission shaft (driven shaft) 92. The second transmission shaft 92 is disposed downstream of the first transmission shaft 91 in the power transmission path.

  Of the transmission clutch body, the first clutch forming body 141 has a claw portion 141a. The first clutch forming body 141 is externally fitted to the first transmission shaft 91 so as not to rotate relative to the first transmission shaft 91 and to slide in the axial direction. The 1st transmission shaft 91 and the 2nd transmission shaft 92 are arrange | positioned on a coaxial line, and are connected so that relative rotation is possible.

  Of the transmission clutch body, the second clutch forming body 142 has a claw portion 142a and an engaging portion 142b. The second clutch formation body 142 is externally fitted to the second transmission shaft 92 so as not to rotate relative to the second transmission shaft 92 and to be slidable in the axial direction, so that the claw portion 142a faces the claw portion 141a of the first clutch formation body 141. Has been placed.

  When the second clutch formation body 142 moves in a direction approaching the first clutch formation body 141, the claw portion 142a of the second clutch formation body 142 can be engaged with the claw portion 141a of the first clutch formation body 141. Yes. When the second clutch forming body 142 moves away from the first clutch forming body 141, the claw portion 142a of the second clutch forming body 142 releases the engaged state with the claw portion 141a of the first clutch forming body 141. It is possible.

  The engaging part 142b of the second clutch forming body 142 is disposed downstream of the claw part 142a in the power transmission path. The engaging portion 142b is formed as a concave groove on the peripheral surface of the second clutch forming body 142, and a transmission clutch side interlocking member 210 of the interlocking mechanism 200 described later can be engaged therein. .

  The transmission clutch urging member 143 includes a spring or the like. The transmission clutch urging member 143 is disposed on the downstream side of the power transmission path with respect to the second clutch forming body 142 and is externally fitted to the second transmission shaft 92. The transmission clutch biasing member 143 biases the second clutch formation body 142 so that the claw portion 142a of the second clutch formation body 142 engages with the claw portion 141a of the first clutch formation body 141.

  In such a configuration, when the transmission clutch 140 is in a disconnected state as shown in FIG. 5, the second clutch formation body 142 moves by the urging force of the transmission clutch urging member 143 if no operation force is received from the outside. 6 and 7, the claw portion 142a of the second clutch formation body 142 is engaged with the claw portion 141a of the first clutch formation body 141. Thereby, the transmission clutch 140 is in a connected state, and power can be transmitted from the first transmission shaft 91 to the second transmission shaft 92.

  On the other hand, when the transmission clutch is in the connected state as shown in FIGS. 6 and 7, the second clutch formation body 142 resists the urging force of the transmission clutch urging member 143 according to the operation of the interlocking mechanism 200. When moved, the engagement between the claw portion 142a of the second clutch forming body 142 and the claw portion 141a of the first clutch forming body 141 is released as shown in FIG. As a result, the transmission clutch 140 is switched from the connected state to the disconnected state, and the power is not transmitted from the first transmission shaft 91 to the second transmission shaft 92.

  Next, the planting clutch 170 of the inter-stock transmission unit 110 will be described.

  When the planting clutch 170 is shifted from the connected state to the disconnected state, the planting claw 56 will be described later so that the planting claw 56 is not stopped from rotating at a position where the planting claw 56 contacts the field scene W or the seedling stage 57. The power transmission can be cut off while rotating to a predetermined upper stop position (reference position). Specifically, in the present embodiment, as shown in FIG. 8, the planting clutch 170 includes a third clutch formation body (drive side clutch formation body) 173 and a fourth clutch formation body (driven side clutch formation body). The planting clutch main body which has 174, the cam body 175, and the planting clutch biasing member 177 are provided. The planting clutch 170 is provided with an interlocking mechanism 180 having a planting clutch operating member 176. The planting clutch 170 is housed in the inter-stock transmission case 114.

  The 3rd clutch formation body 173 among the planting clutch main bodies is arrange | positioned in the transmission direction upstream, and is comprised so that rotational power may be input from the transmission direction upstream. The third clutch forming body 173 has a claw portion. The third clutch forming body 173 is externally fitted to the rear end portion of the slide shaft 118 so as not to rotate relative to the slide shaft 118 and to slide in the axial direction.

  The 4th clutch formation body 174 is arrange | positioned among the planting clutch main bodies at the transmission direction downstream, and is comprised so that engagement / disengagement is possible with respect to the 3rd clutch formation body 173 in the state connected with the planting claw 56. . The fourth clutch forming body 174 has a claw portion and a connecting portion. The fourth clutch forming body 174 is externally fitted to the output shaft 116 so as not to rotate relative to the output shaft 116 and to be slidable in the axial direction, and is disposed so that the claw portion faces the claw portion of the third clutch forming body 173. The connecting part is arranged downstream of the claw part in the power transmission path.

  The claw portion of the fourth clutch formation body 174 can be engaged with the claw portion of the third clutch formation body 173 when the fourth clutch formation body 174 moves in the proximity direction approaching the third clutch formation body 173. . The claw portion of the fourth clutch forming body 174 can be disengaged from the claw portion of the third clutch forming body 173 when the fourth clutch forming body moves in the separating direction away from the third clutch forming body 173. Has been.

  The cam body 175 receives the driving force (clutch disengaging operation force) from the planting clutch actuating member 176 and operates the fourth clutch forming body 174 (output shaft 116) around a predetermined position (ie, the output shaft 116). A cam groove 175a that separates from the third clutch forming body 173 (slide shaft 118) while rotating the connected planting claw 56 to a position where the planting claw 56 is positioned at an upper stop position described below is provided. In the present embodiment, the cam groove 175a is formed in a predetermined range in the circumferential direction of the outer peripheral surface of the cam body 175, and has a cam surface made of an inclined surface. The cam body 175 is externally fitted to the connecting portion of the fourth clutch forming body 174 so as not to be relatively rotatable and non-slidable in the axial direction, and is connected to the fourth clutch forming body 174. You may form integrally with the clutch formation body 174. FIG.

  The planting clutch urging member 177 is composed of a spring or the like. The planting clutch urging member 177 is disposed on the downstream side of the power transmission path with respect to the fourth clutch forming body 174 and is externally fitted to the output shaft 116. The planting clutch urging member 177 urges the fourth clutch forming body 174 such that the claw portion of the fourth clutch forming body 174 engages with the claw portion of the third clutch forming body 173.

  The planting clutch actuating member 176 is a solenoid actuator in this embodiment, and can apply a clutch disengaging operation force to the cam groove 175a (fourth clutch forming body 174) of the cam body 175. The planting clutch operating member 176 is provided with an operating piece 178. The operating piece 178 is disposed so as to face the cam body 175, and can be moved forward and backward with respect to the cam body 175 by a clutch disengaging operation force from the planting clutch operating member 176. That is, the operating piece 178 can be advanced to an advanced position where it is engaged with the cam groove 175a so as to apply a clutch disengagement operation force to the cam groove 175a of the cam body 175. The operating piece 178 can be retracted from the advanced position to the retracted position where the engagement with the cam groove 175a is released.

  In such a configuration, when the operating piece 178 of the planting clutch operating member 176 is in the retracted position, when the cam groove 175a of the cam body 175 does not receive the clutch disengaging operation force from the planting clutch operating member 176, the first The four-clutch forming body 174 moves in the proximity direction by the urging force of the planting clutch urging member 177. At this time, the operating piece 178 does not contact the cam body 175. As a result, the claw portion of the fourth clutch forming body 174 engages with the claw portion of the third clutch forming body 173, and the planting clutch 170 is in the connected state. Therefore, the power is transmitted from the inter-part transmission unit 110 to the planting unit 50 (the rotary case 55 and the planting claw 56).

Here, even when the cam groove 175a of the cam body 175 receives a clutch disengaging operation force from the planting clutch operating member 176, the planting clutch 170 is not necessarily shifted from the connected state to the disconnected state. The clutch disengaging operation force of the clutch actuating member 176 is set.
More specifically, when the driven fourth clutch forming body 174 (output shaft 116) is rotated around the axis by the driving third clutch forming body 173 (slide shaft 118), the cam groove of the cam body 175 is provided. When 175a receives a clutch disengagement operation force from the planting clutch actuating member 176, the planting clutch 170 is disengaged, and the cam groove 175a of the cam body 175 is planted when the third clutch forming body 173 is stopped rotating. Even if the clutch disengaging operation force is received from the clutch operating member 176, the planting clutch 170 maintains the connected state. That is, in a state where the fourth clutch forming body 174 is rotating around the axis by the rotation of the third clutch forming body 173, the fourth clutch forming body 174 can be rotated while being separated from the third clutch forming body 173. However, in a state where the third clutch forming body 173 is not rotating, the fourth clutch forming body 174 cannot be rotated while being separated from the third clutch forming body 173.

  When the claw portion of the fourth clutch forming body 174 is engaged with the claw portion of the third clutch forming body 173 in this way, rotational power is input to the third clutch forming body 173 from the upper side in the transmission direction. When the operating piece 178 of the planting clutch operating member 176 advances from the retracted position into the cam groove 175a of the cam body 175, and the operating piece 178 and the cam groove 175a are engaged, the operating piece 178 advances. The cam body 175 and the fourth clutch forming body 174 rotate by a certain amount around the axis while moving in the separating direction against the urging force of the planting clutch urging member 177. As a result, the engagement between the claw portion of the fourth clutch forming body 174 and the claw portion of the third clutch forming body 173 is released, and the planting clutch 170 ends the cutting operation. That is, the planting clutch 170 is switched from the connected state to the disconnected state. Therefore, power is not transmitted from the inter-part transmission unit 110 to the planting unit 50.

  At this time, the planting rotary shaft 137 operatively connected to the output shaft 116 (fourth clutch forming body 174) rotates according to the rotation amount of the output shaft 116 by a certain amount of rotation of the output shaft 116. . As a result, the rotary case 55 rotates, and the planting claw 56 is driven to move to the upper stop position along with this rotation and stops. Thus, when the planting clutch 170 is switched from the connected state to the disconnected state, the planting claw 56 returns to the upper stop position regardless of the position when the planting clutch 170 starts the cutting operation. .

  Here, the upper stop position is a preset reference position of the planting claw 56, and when the rotation of the rotary case 55 stops, the planting claw 56 does not come into contact with the field scene W or the seedling mount 57. Position. When the planting claw 56 is in the upper stop position, for example, as shown in FIG.

Preferably, the planting clutch operating member is set such that there is a time delay between the time when the planting clutch operating member 176 is driven and the operating piece 178 acting on the cam body 175 (fourth clutch forming body 174). An accommodation mechanism is interposed between the 176 and the operating piece 178.
According to this accommodation mechanism, since the operating piece 178 does not act on the cam body 175 immediately after the driving of the planting clutch operating member 176 is started, the third clutch forming body 173 is stopped (for example, the rice transplanter 100). When the planting clutch operating member 176 is driven in the stop state immediately before starting), the driving force applied by the planting clutch operating member 176 to the cam body 175 in the rotation stopped state can be reduced as much as possible. . Therefore, the operating piece 178 can be effectively applied to the cam body 175 while reducing the load applied to the planting clutch operating member 176.

Specifically, in this embodiment, as shown in FIG. 8, the accommodation mechanism includes a spring 179. When the planting clutch 170 shifts from the connected state to the disconnected state, for example, if the third clutch forming body 173 is stopped, the spring 179 acts as follows.
That is, when the planting clutch actuating member 176 is driven in the planting clutch disengagement direction, the actuating piece 178 is pushed through the spring 179 by the driving of the planting clutch actuating member 176 and contacts the cam body 175. When the planting clutch operating member 176 continues to be driven in the planting clutch disengagement direction, the spring 179 is compressed by a predetermined amount. In this state, the operating piece 178 remains in contact with the cam body 175 and is not moved.
When the spring 179 is compressed by a predetermined amount and the retained elasticity (the urging force of the spring 179) is increased, the planting clutch operating member 176 is driven in the planting clutch disengagement direction with the spring 179 compressed by a predetermined amount. The force is transmitted to the operating piece 178 through the spring 179 as a clutch disengaging operation force, and the operating piece 178 is pushed. In this state, when the fourth clutch forming body 174 (third clutch forming body 173) rotates and the operating piece 178 engages with the cam groove 175a of the cam body 175, the operating piece 178 is moved in the circumferential direction of the cam groove 175a. It moves along the cam surface of the cam groove 175a until it reaches the end of the cam groove 175a. The movement of the operating piece 178 causes the fourth clutch forming body 174 to rotate about the axis while being separated from the third clutch forming body 173. As a result, the planting clutch 170 is disconnected and the planting claw 56 is moved to the upper stop position. Move up. If the planting clutch actuating member 176 is further driven in the clutch disengagement direction after the planting claw 56 has moved to the upper stop position, the spring 179 is in the maximum compression state and the operating piece 178 is not moved.

Further, the accommodation mechanism can be constituted by a cam 192, for example.
FIG. 13A shows the state of the accommodation mechanism when the planting clutch 170 is in the connected state. FIG. 13B shows the accommodation mechanism when the planting clutch 170 is in a disconnected state.

  In this case, as shown in FIGS. 13A and 13B, a wiper motor 191 is used instead of the planting clutch actuating member 176 which is a solenoid actuator. A cam 192 having a large-diameter portion 192a and a small-diameter portion 192b between the wiper motor 191 and the operating piece 178 and rotatable about the rotation shaft 194, and a drive shaft of the wiper motor 191. A gear 195 meshed with 191a and rotatable about a rotation shaft 194, and one end 196a can be pressed against a cam surface of the cam 192 by a spring (not shown), and the other end 196b is operated. A rotation arm 196 connected to the piece 178 is provided, and a rotation arm 196 that is rotatable about a support shaft 197 parallel to the rotation shaft 194 is provided. The rotating arm 196 is bent or curved between one end 196a and the other end 196b so as to be substantially L-shaped, and is supported by the support shaft 197 at the bent portion.

In such a configuration, when the planting clutch 170 shifts from the connected state to the disconnected state, for example, if the third clutch forming body 173 is in a rotation stopped state, the cam 192 acts as follows. become.
That is, when the wiper motor 191 is driven in the disengagement direction of the planting clutch in the state shown in FIG. 13 (a), the gear 195 is rotated in the direction of the arrow in FIG. 13 (a) by the rotation of the drive shaft 191a. The cam 192 is also rotated in the same direction as the gear 195. As a result, the engagement between the one end portion of the rotating arm 196 and the large-diameter portion 192a of the cam 192 is released, and the rotating arm 196 can be rotated by the biasing force of the spring. The rotating arm 196 rotates around the support shaft 197 in the direction of the arrow in FIG. 13A, and the operating piece 178 is pushed by the rotation of the rotating arm 196 to contact the cam body 175.
Here, since the fourth clutch forming body 174 (third clutch forming body 173) is in a stopped state, the operating piece 178 is not moved any further, and the one end 196a of the rotating arm 196 is moved to the cam 192. And is not engaged. When the fourth clutch forming body 174 is rotated from this state and the operating piece 178 is engaged with the cam groove 175a, the operating piece 178 reaches the end of the cam groove 175a in the circumferential direction by using the biasing force of the spring. Until it moves along the cam surface of the cam groove 175a. The movement of the operating piece 178 causes the fourth clutch forming body 174 to rotate about the axis while being separated from the third clutch forming body 173. As a result, the planting clutch 170 is disconnected and the planting claw 56 is moved to the upper stop position. Move up. When the planting claw 56 moves to the upper stop position, as shown in FIG. 13B, the one end 196a of the rotating arm 196 is engaged with the small diameter portion 192b, and the operating piece 178 is not moved.

  When the wiper motor 191 is driven in the planting clutch engagement direction with the cam 192 in the pivot position shown in FIG. 13B, the planting clutch operating member 176 is driven in the clutch connection direction. Since the force is transmitted to the rotating arm 196 and then to the operating piece 178 via the pressing surface 192c between the large diameter portion 192a and the small diameter portion 192b, the planting clutch operating member 176 is driven. There is almost no time delay until the operating piece 178 moves to disengage the cam body 175 from the cam groove 175a.

  Next, a structure for bringing the transmission clutch 140 and the planting clutch 170 into a connected state or a disconnected state will be described.

  As shown in FIGS. 5, 6, 7, 8, 9, 10, 11, and 12, the rice transplanter 100 includes an interlocking mechanism 200 and a check mechanism 250.

  The interlocking mechanism 200 includes the planting clutch 170 and the transmission clutch 140 so that the transmission state (connected state and disconnected state) of the transmission clutch 140 is switched in accordance with the switching of the transmission state (connected state and disconnected state) of the planting clutch 170. Connect between the operation.

  In this embodiment, the interlocking mechanism 200 basically transmits the transmission clutch 140 when the planting clutch 170 is switched to the disconnected state, and when the planting clutch 170 is switched to the connected state. The planting clutch 170 and the transmission clutch 140 are operatively connected so that the clutch 140 can be switched to the connected state.

  As shown in FIGS. 5, 6, and 7, the interlocking mechanism 200 includes a transmission clutch side interlocking member 210 and a planting clutch side interlocking member 220.

  The transmission clutch side interlocking member 210 moves in response to switching of the transmission state of the transmission clutch 140. The transmission clutch side interlocking member 210 includes a transmission clutch side first interlocking member 211 and a transmission clutch side second interlocking member 212.

  The transmission clutch side first interlocking member 211 is provided in the vicinity of the second clutch forming body 142 in the transmission clutch case 145. One end portion of the transmission clutch side first interlocking member 211 in the longitudinal direction is engaged with the engaging portion 142 b of the second clutch forming body 142. The other end of the transmission clutch side first interlocking member 211 in the longitudinal direction is connected to the first reference shaft 241. The first reference shaft 241 is provided so as to extend in a direction substantially orthogonal to the second transmission shaft 92 and is rotatably supported by the transmission clutch case 145.

  Thus, the transmission clutch side first interlocking member 211 can swing in the clutch connecting direction or the clutch disengaging direction around the first reference shaft 241. Here, the clutch engagement direction is a direction in which the second clutch formation body 142 approaches the first clutch formation body 141 in the axial directions of the first transmission shaft 91 and the second transmission shaft 92, and the clutch disconnection direction is the first direction. Of the axial directions of the transmission shaft 91 and the second transmission shaft 92, the second clutch forming body 142 is away from the first clutch forming body 141.

  The transmission clutch side second interlocking member 212 is provided to extend along the transmission clutch side first interlocking member 211 outside the transmission clutch case 145. One end of the transmission clutch side second interlocking member 212 in the longitudinal direction is connected to the first reference shaft 241. The other end of the transmission clutch side second interlocking member 212 in the longitudinal direction is a free end.

  Thus, the transmission clutch side second interlocking member 212 can swing integrally with the transmission clutch side first interlocking member 211 around the first reference shaft 241 in the clutch connecting direction or the clutch disengaging direction.

  Further, an engagement protrusion 215 extending in the axial direction of the first reference shaft 241 is provided at the other end portion that is the free end side of the transmission clutch side second interlocking member 212.

  The planting clutch side interlocking member 220 moves in response to switching of the transmission state of the planting clutch 170. The planting clutch side interlocking member 220 includes a planting clutch side first interlocking member 221, a planting clutch side second interlocking member 222, and a planting clutch side interlocking member engaging biasing member 223.

  The planting clutch side first interlocking member 221 is disposed outside the transmission clutch case 145 and closer to the clutch disconnection direction than the transmission clutch side second interlocking member 212. One end of the planting clutch side first interlocking member 221 in the longitudinal direction is externally fitted to the first reference shaft 241 so as to be relatively rotatable. The other end of the planting clutch side first interlocking member 221 in the longitudinal direction is disposed near the tip of the transmission clutch side second interlocking member 212.

  Thus, the planting clutch-side first interlocking member 221 can swing around the first reference shaft 241 in the clutch connecting direction or the clutch disengaging direction. In the present embodiment, in order to simplify the structure, the planting clutch side first interlocking member 221 can swing around the first reference shaft 241, but the second reference shaft parallel to the first reference shaft 241 is used. The planting clutch side first interlocking member 221 may be swingable about the second reference axis.

  The planting clutch side second interlocking member 222 has an engaging surface 222a. The planting clutch side second interlocking member 222 is provided so as to extend substantially in the axial direction of the second transmission shaft 92. One end of the planting clutch side second interlocking member 222 in the longitudinal direction is connected to the tip of the planting clutch side first interlocking member 221 via a third reference shaft 243 parallel to the first reference shaft 241. . The other end portion of the planting clutch side second interlocking member 222 in the longitudinal direction is a free end, and is near the distal end portion of the transmission clutch side second interlocking member 212 and from the first reference shaft 241 rather than the engagement protrusion 215. It is located at a distance.

  The planting clutch side second interlocking member 222 swings around the third reference shaft 243 toward one side approaching the engagement protrusion 215 of the transmission clutch side second interlocking member 212 or to the other side away from the engagement protrusion 215. It is possible.

  The engaging surface 222a has a pushing surface 222b and a cam surface 222c. The engagement surface 222a is between one end and the other end of the planting clutch side second interlocking member 222 and is in the longitudinal direction on the end surface facing the engagement protrusion 215 of the planting clutch side second interlocking member 222. It is formed over and can engage with the engaging protrusion 215.

  The pushing surface 222b is provided in the middle of the planting clutch side second interlocking member 222 in the longitudinal direction. When the transmission clutch side interlocking member 210 swings around the first reference shaft 241 in the clutch engagement direction, the pushing surface 222b is inserted in a state where the engaging surface 222a is engaged with the engaging protrusion 215. When the attached clutch-side first interlocking member 221 is swung around the first reference shaft 241 in the clutch disengaging direction, the transmission clutch-side interlocking member 210 is rotated around the first reference shaft 241 via the engagement protrusion 215 in the clutch disengaging direction. It is comprised so that it can push to.

  The cam surface 222c is provided at the other end portion of the planting clutch side second interlocking member 222 in the longitudinal direction. The cam surface 222c is connected to the transmission clutch 140 while the planting clutch 170 is in a disconnected state when the planting clutch side second interlocking member 222 is swung to the other side around the third reference shaft 243. It is configured to be able to engage with the engaging protrusion 215 when in contact.

  The urging member 223 for engaging the planting clutch side interlocking member is located on the middle in the longitudinal direction of the planting clutch side second interlocking member 222 and the third reference shaft 243 among the planting clutch side first interlocking member 221. It is interposed between a portion close to one reference shaft 241. The planting clutch side second interlocking member 222 is configured by a spring or the like.

  The planting clutch side interlocking member engaging biasing member 223 is implanted so that the engagement protrusion 215 of the transmission clutch side second interlocking member 212 engages with the engagement surface 222a of the planting clutch side second interlocking member 222. The attached clutch side second interlocking member 222 is urged to one side around the third reference shaft 243.

  Further, a link member 225 is interposed between the planting clutch side interlocking member 220 and the planting clutch actuating member 176. The link member 225 is configured to be able to move the planting clutch side second interlocking member 222 in the clutch connecting direction in conjunction with the connection operation of the planting clutch operating member 176 (planting clutch 170). . The link member 225 is configured to be able to move the planting clutch side second interlocking member 222 in the clutch disconnecting direction in conjunction with the disconnecting operation of the planting clutch operating member 176 (planting clutch 170). .

  And the planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 are comprised so that a cooperation state and a cancellation | release state can be taken. The linked states are linked so that the transmission clutch 140 switches from the connected state to the disconnected state against the urging force of the transmission clutch urging member 143 in accordance with the switching operation of the planting clutch 170 from the connected state to the disconnected state. It is the state that was done. The released state is a state in which the linked state is released so as to allow the transmission clutch 140 to be connected by the urging force of the transmission clutch urging member 143 regardless of the transmission state of the planting clutch 170. It is.

  The check mechanism 250 prohibits the operation of the interlocking mechanism 200 so as to allow the transmission clutch 140 to be in the clutch engaged state while the planting clutch 170 remains in the clutch disengaged state. Then, the check mechanism 250 is arranged so that the planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 are in the released state in accordance with the descending operation of the planting unit 50 from the ascending position to the descending position. 50 and the interlocking mechanism 200 are operatively connected.

  As shown in FIGS. 9, 10, and 11, the restraining mechanism 250 includes a planting part side first interlocking member 251, a planting part side second interlocking member 252, and a long connecting member 253. .

  The planting part side first interlocking member 251 is provided near the front end of the lower link 72 of the elevating link mechanism 70 and is provided so as to extend along the lower link 72. One end portion of the planting portion side first interlocking member 251 in the longitudinal direction is connected to a fourth reference shaft 244 that is connected to the front end portion of the lower link 72. The other end portion in the longitudinal direction of the planting portion side first interlocking member 251 is a free end. The fourth reference shaft 244 is provided so as to extend in the left-right direction.

  Thus, the planting part side first interlocking member 251 can swing in the upward and downward directions around the fourth reference shaft 244 in conjunction with the ascending operation and the descending operation of the planting part 50. That is, the planting part side first interlocking member 251 swings in the upward direction when the lower link 72 rotates in the upward direction (upward), and when the lower link 72 rotates in the downward direction (downward). It swings in the downward direction.

  The planting part side second interlocking member 252 has a contact part 252a and a connecting part 252b. The planting part side second interlocking member 252 is mainly provided on the side closer to the planting part 50 than the planting part side first interlocking member 251. The center part in the longitudinal direction of the planting part side second interlocking member 252 is supported by the support frame 271 via a fifth reference axis 245 parallel to the fourth reference axis 244, and can swing around the fifth reference axis 245. Has been. The support frame 271 is fixed to the vehicle body frame 11.

  One end part of the planting part side second interlocking member 252 in the longitudinal direction is arranged to face the other end part of the planting part side first interlocking member 251. The other end portion in the longitudinal direction of the planting portion side second interlocking member 252 is disposed on the opposite side to the one end portion with the fifth reference shaft 245 in the front-rear direction.

  The contact part 252a is provided at one end of the planting part side second interlocking member 252. The contact part 252a is arranged so as to overlap the other end part of the planting part side first interlocking member 251 in the vertical direction, and temporarily contacts the other end part when the planting part side first interlocking member 251 swings. Can be contacted.

  The connecting part 252b is provided at the other end of the planting part side second interlocking member 252. A neutral position biasing member 255 is interposed between the connecting portion 252b and a portion of the support frame 271 that is located closer to the planting portion 50 than the connecting portion 252b. The neutral position biasing member 255 is configured by a spring or the like.

  The neutral position biasing member 255 biases the planting part side second interlocking member 252 so that the planting part side second interlocking member 252 swings around the fifth reference shaft 245 and returns to the neutral position. . Here, the neutral position means that the one end and the other end of the planting part side second interlocking member 252 are substantially at the same height in the vertical direction, and the long connecting member 253 is located on the planting part side. 2 A position where the interlocking member 252 is not pulled.

  Thus, the planting part side second interlocking member 252 can swing around the fifth reference axis 245, and the planting part side first interlocking member 251 swings around the fourth reference axis 244 in the upward and downward directions. According to the movement, it swings in the upward and downward directions around the fifth reference shaft 245 so that the contact portion 252a and the connecting portion 252b can be moved in the opposite directions when swinging in one direction. It has become. The planting part side second interlocking member 252 can swing around the fifth reference axis 245 independently of the planting part side first interlocking member 251 and can return to the neutral position. .

  Here, when the planting part side second interlocking member 252 swings around the fifth reference shaft 245 in the upward direction, the contact part 252a moves in the upward direction and the connecting part 252b moves in the downward direction. When the planting part side second interlocking member 252 swings around the fifth reference shaft 245 in the downward direction, the contact part 252a moves in the downward direction, and the connecting part 252b moves in the upward direction.

  The long linkage member 253 is formed of a wire and is interposed between the planting clutch side second interlocking member 222 and the planting part side second interlocking member 252. One end portion of the linkage member 253 is connected to the middle portion of the planting clutch side second interlocking member 222 from the support unit side while being supported by the other end portion of the planting clutch side first interlocking member 221. The other end of the linking member 253 is supported by the support frame 271 below the planting part side second interlocking member 252, while the planting part side second interlocking member 252 located above the support part side. Are connected to the connecting portion 252b.

  In addition, as shown in FIG. 12, the rice transplanter 100 includes a control device 260 in order to switch the planting clutch 170 to a connected state or a disconnected state.

  The control device 260 includes an arithmetic device (CPU) and a storage device. The storage device includes, for example, a ROM that stores a control program, control data, and the like, an EEPROM that stores setting values and the like that are not lost even when the power is turned off, and the setting values and the like can be rewritten, and the arithmetic unit And a storage unit including a RAM or the like that temporarily holds data generated during the calculation.

  The control device 260 is connected to the ascending operation detecting device 261, the descending operation detecting device 262, the planting clutch engagement operation detecting device 263, and the planting clutch disengaging operation detecting device 264, as well as the highest ascending detection device 265 and the most descending detection device. H.266. The control device 260 is also connected to the planting clutch operating member 176 of the planting clutch 170 and the electromagnetic valve 268 of the elevating cylinder 75.

  The ascending operation detection device 261 is constituted by a limit switch, for example, and is provided at the base end portion of the operation lever 38. The raising operation detecting device 261 is configured to detect the raising operation when the raising operation for raising the planting unit 50 is performed on the operation lever 38.

  The descending operation detection device 262 is constituted by a limit switch, for example, and is provided at the base end portion of the operation lever 38. The lowering operation detection device 262 is configured to detect the lowering operation when the lowering operation for lowering the planting unit 50 is performed on the operation lever 38.

  The planting clutch connection operation detection device 263 is configured by a limit switch, for example, and is provided at the proximal end portion of the operation lever 38. The planting clutch connection operation detection device 263 is configured to detect this connection operation when a connection operation for connecting the planting clutch 170 to the operation lever 38 is performed.

  The planting clutch disengagement operation detection device 264 is constituted by a limit switch, for example, and is provided at the proximal end portion of the operation lever 38. The planting clutch disconnection operation detection device 264 is configured to detect this connection operation when a disconnection operation for disconnecting the planting clutch 170 is performed on the operation lever 38.

  The highest rise detection device 265 is composed of, for example, a rotor lipotensometer and is provided in the lift link mechanism 70. The highest rise detection device 265 is configured to detect that the planting unit 50 has moved to the highest rise position with respect to the traveling unit 10 by the operation of the lifting link mechanism 70. This elevated position can be arbitrarily set.

  The lowest-falling detection device 266 is composed of, for example, a rotary potentiometer and is provided in the lifting link mechanism 70. The lowest detection device 266 is configured to detect that the planting unit 50 has moved to the lowest position with respect to the traveling unit 10 by the operation of the lifting link mechanism 70. This lowest position is a planting work position where the float 58 contacts the farm scene W.

  When the control device 260 determines that the operation lever 38 has been lifted based on the detection signal detected by the lift operation detection device 261, the control device 260 outputs a control signal to the electromagnetic valve 268 to contract the lift cylinder 75. Thereby, the planting part 50 rises with respect to the traveling part 10.

  When the control device 260 determines that the operation lever 38 has been lowered based on the detection signal detected by the lowering operation detection device 262, the control device 260 outputs a control signal to the electromagnetic valve 268 to extend the elevating cylinder 75. Thereby, the planting part 50 descends with respect to the traveling part 10.

  When the control device 260 determines that the operation lever 38 is connected based on the detection signal detected by the planting clutch connection operation detecting device 263, the control device 260 outputs a control signal to the planting clutch operating member 176 of the planting clutch 170. Then, the operating piece 178 is retracted to the retracted position. Thereby, the planting clutch 170 will be in a connection state.

  When the control device 260 determines that the operation lever 38 is connected based on the detection signal detected by the planting clutch disengagement operation detection device 264, the control device 260 outputs a control signal to the planting clutch operating member 176 of the planting clutch 170. Then, the operating piece 178 is advanced to the advanced position. Thereby, the planting clutch 170 is in a disconnected state.

  When it is determined that the planting unit 50 has reached the highest position based on the detection signal detected by the highest rise detection device 265 when the planting unit 50 is raised, the control device 260 controls the electromagnetic valve 268. A signal is output to stop the contraction operation of the lifting cylinder 75. Thereby, the raise of the planting part 50 stops and the planting part 50 is located in the highest rise position.

  When the planting unit 50 is descending, the control device 260 controls the solenoid valve 268 to control the planting unit 50 when the planting unit 50 has reached the lowest position based on the detection signal detected by the lowest-falling detection device 266. A signal is output to stop the extending operation of the lifting cylinder 75. Thereby, the descent | fall of the planting part 50 stops and the planting part 50 is located in the lowest fall position.

  Further, the control device 260 raises the operation lever 38 based on the detection signal detected by the raising operation detection device 261 in a state where the planting unit 50 is located at the lowest position and the planting clutch 170 is connected. If it is determined that it has been operated, a control signal is output to the electromagnetic valve 268 to contract the elevating cylinder 25 and a control signal is output to the planting clutch operating member 176 to advance the operating piece 178 to the advanced position. Let Thereby, the planting part 50 raises and the planting clutch 170 is cut | disconnected.

  In such a configuration, for example, the connected state and the disconnected state of the transmission clutch 140 and the planting clutch 170 are switched in association with the ascending / descending operation of the planting unit 50 as follows.

  When the rice transplanter 100 is planting while traveling straight, when it reaches the shore, it temporarily stops the planting and turns to change the direction. Do. When the rice transplanter 100 turns in this way, the operation lever 38 is raised by the operator at the start of turning. By this raising operation, the planting part 50 is raised from the lowest position, and the planting clutch 170 is switched from the connected state to the disconnected state shown in FIG.

  Then, in conjunction with the switching of the planting clutch 170 from the connected state to the disconnected state, the transmission clutch 140 is switched from the connected state shown in FIG. 6 to the disconnected state shown in FIG. At this time, in the interlocking mechanism 200, the planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 are in a linked state.

  Specifically, when the planting clutch 170 starts the cutting operation, the interlocking mechanism 200 is operated and the transmission clutch 140 starts the cutting operation. In the interlocking mechanism 200, the planting clutch side second interlocking member 222 is pulled and moved in the clutch disengagement direction via the link member 225 by the operation of the planting clutch operating member 176.

  At this time, since the pushing surface 222b of the engagement surface 222a of the planting clutch side second interlocking member 222 is engaged with the engagement protrusion 215 of the transmission clutch side second interlocking member 212, the planting clutch Due to the movement of the second side interlocking member 222, the transmission clutch side interlocking member 210 (the transmission clutch side first interlocking member 211 and the transmission clutch side second interlocking member 212) swings around the first reference shaft 241 in the clutch disengagement direction.

  Therefore, the second clutch formation body 142 of the transmission clutch 140 moves in the clutch disengagement direction, and the engagement between the claw portion 142a of the second clutch formation body 142 and the claw portion 141a of the first clutch formation body 141 is released. Thereby, the disconnection operation of the transmission clutch 140 is completed, and the transmission clutch 140 is switched from the connected state to the disconnected state.

  Here, the transmission clutch 140 is operatively connected to the planting clutch 170 by the link member 225 so that the operation piece 178 of the planting clutch operating member 176 is disconnected, for example, when the operation piece 178 is operated by a small amount. Thus, the cutting operation is configured to end earlier than the cutting operation of the planting clutch 170.

  When the disengaging operation of the transmission clutch 140 is completed, no rotational power is input to the third clutch forming body 173 of the planting clutch 170, so that the third clutch forming body 173 is stopped and the planting clutch operating member 176 is stopped. However, even if the clutch disengaging operation force is applied to the cam groove 175a of the cam body 175, the fourth clutch forming body 174 engaged with the third clutch forming body 173 does not rotate around the axis. Therefore, the cutting operation of the planting clutch 170 does not proceed and the output shaft 116 does not rotate by a certain amount as described above. Here, since the clutch disengagement operating force of the planting clutch actuating member 176 is set as described above, even if the cam groove 175a of the cam body 175 receives this operating force, the fourth clutch forming body 174 (output shaft 116). Does not rotate while being separated from the third clutch forming body 173 (slide shaft 118). Therefore, the rotary case 55 does not rotate so that the planting claw 56 moves to the upper stop position. As a result, the planting claw 56 attached to the rotary case 55 moves from the position when the transmission clutch 140 is disconnected. do not do.

  Therefore, even if the planting claw 56 takes out the seedling from the seedling mat on the seedling placing table 57 and holds it when the planting part 50 is raised from the lowest lowered position for turning the rice transplanter 100. Since the planting claw 56 does not move in a substantially stopped state as soon as possible, the seedling is still rising even if the rice transplanter 100 starts moving for turning after the operation lever 38 is operated. It is not emitted from the planting claw 56 of the planting part 50. This seedling is held by the planting claws 56 when the planting part 50 is raised.

  During the ascent of the planting part 50, the first interlocking member 251 of the planting part side swings in the upward direction around the fourth reference shaft 244 integrally with the lower link 72 from the state shown in FIG. The other end part of the planting part side 1st interlocking member 251 contacts the contact part 252a of the planting part side 2nd interlocking member 252 from the downward direction. The other end portion of the planting part side first interlocking member 251 swings the planting part side second interlocking member 252 so as to push up the contact part 252a as the planting part 50 rises.

  And if the planting part 50 raises to a predetermined | prescribed height position, the contact state of the said other end part of the planting part side 1st interlocking | linkage member 251 and the contact part 252a will be cancelled | released. Thereafter, the planting part side second interlocking member 252 returns to the neutral position, and the other end part of the planting part side first interlocking member 251 is positioned above the contact part 252a as shown in FIG. Become.

  When the contact part 252a of the planting part side second interlocking member 252 is pushed up by the other end part of the planting part side first interlocking member 251, the planting part side second interlocking member 252 swings, and its connecting part 252b moves in the downward direction. As a result, the linkage member 253 is pushed downward by the connecting portion 252b, but is loosened between the connecting portion 252b and the planting clutch side second interlocking member 222.

  Therefore, the planting clutch side second interlocking member 222 does not operate in conjunction with the planting part side second interlocking member 252, and neither the transmission clutch side second interlocking member 212 nor the transmission clutch side first interlocking member 211 operates. Therefore, the transmission clutch 140 is not affected by the rise of the planting part 50 via the interlocking mechanism 200 when the planting part 50 is raised, and holds the transmission state without changing.

  When the turning of the rice transplanter 100 is completed after the operation lever 38 is raised in this way, the operation lever 38 is lowered by the operator to resume the planting operation. By this lowering operation, the planting part 50 is lowered from the highest position to the lowest position.

  During the descending of the planting part 50, the first interlocking member 251 in the restraining mechanism 250 swings in the downward direction integrally with the lower link 72 from the state shown in FIG. 10 with the fourth reference shaft 244 as a fulcrum. When the planting part 50 reaches the set height position, the other end of the planting part side first interlocking member 251 contacts the contact part 252a of the planting part side second interlocking member 252 from above. As shown in FIG. 11, the other end portion of the planting part side first interlocking member 251 pushes down the contact part 252 a of the planting part side second interlocking member 252 as the planting part 50 descends. The side second interlocking member 252 is swung.

  And if the planting part 50 descend | falls only the predetermined amount from the said setting height position, the contact state of the other end part of the planting part side 1st interlocking member 251 and the contact part 252a of the planting part side 2nd interlocking member 252 will be demonstrated. Is released. After that, the planting part side second interlocking member 252 returns to the neutral position, and the other end of the planting part side first interlocking member 251 is positioned below the contact part 252a as shown in FIG. Become. The set height position can be set as appropriate so that the planting claw 56 approaches the field G when the planting unit 50 reaches this position.

  As shown in FIG. 11, when the contact part 252a of the planting part side second interlocking member 252 is pushed down by the other end part of the planting part side first interlocking member 251, the planting part side second interlocking member 252 swings. The connecting portion 252b moves in the upward direction. As a result, the linkage member 253 is pulled upward by the connecting portion 252b, and the planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 are released in conjunction with this.

  That is, in the interlocking mechanism 200, the planting clutch side second interlocking member 222 resists the biasing force of the planting clutch side continuous member engaging biasing member 223, and the engagement protrusion 215 of the transmission clutch side second interlocking member 212 is engaged. And the engagement state between the pushing surface 222b and the engaging protrusion 215 of the transmission clutch side second interlocking member 212 is released. In this way, the check mechanism 250 enters a state in which the action of the interlock mechanism 200 is prohibited.

  In this state, the transmission clutch side second interlocking member 212 can swing in the clutch engagement direction without being regulated by the planting clutch side second interlocking member 222. Therefore, in the transmission clutch 140, the second clutch formation body 142 moves in the clutch engagement direction by the urging force of the transmission clutch urging member 143, and the claw portion 142a engages with the claw portion 141a of the first clutch formation body 141. To do. Thus, the transmission clutch 140 performs a connection operation according to the operation of the interlocking mechanism 200 while the planting unit 50 is descending, and is switched from the disconnected state to the connected state.

  After the transmission clutch 140 is in a connected state when the planting portion 50 is lowered, power is transmitted from the slide shaft 118 to the third clutch forming body 173 in the inter-shaft transmission portion 110 located further downstream of the power transmission path. The Therefore, the fourth clutch forming body 174 (cam body 175) rotates around the axis so that the operating piece 178 of the planting clutch operating member 176 reaches the advanced position, and the transmission clutch 140 is disengaged when the planting part 50 is raised. The disengaging operation of the planting clutch 170 that has been stopped halfway ends.

  Therefore, the planting clutch 170 is completely disconnected. At the same time, since the output shaft 116 rotates together with the fourth clutch forming body 174, the rotary case 55 rotates according to the rotation of the output shaft 116, and the planting claws 56 attached to the rotary case 55 reach the upper stop position. Move while driving.

  At this time, since the planting part 50 is lowered from the set height position and the planting claw 56 is in a position close to the field G, when the planting claw 56 holds a seedling, this seedling Is planted in the field G in the process of the planting claw 56 moving to the upper stop position. Further, although the transmission clutch 140 is in a connected state, the planting clutch 170 is in a disconnected state, so that the power of the engine 12 is not transmitted to the planting unit 50.

  When the transmission clutch 140 is connected, the transmission clutch-side first interlocking member 211 swings in the clutch connection direction by the movement of the second clutch forming body 142 in the clutch connection direction. Accordingly, the transmission clutch side second interlocking member 212 also swings in the clutch engagement direction.

  Therefore, when the planting part side second interlocking member 252 returns to the neutral position, the pulling of the linkage member 253 is released, and the planting clutch side second interlocking member 222 is energized for engaging the planting clutch side coupling member. The member 223 is oscillated in a direction (one side) approaching the engagement protrusion 215 of the transmission clutch side second interlocking member 212 by the urging force of the member 223. The planting clutch side second interlocking member 222 stops in a state where the cam surface 222c of the engagement surface 222a is engaged with the engagement protrusion 215 as shown in FIG. In this state, the transmission clutch 140 is held in the connected state.

  When the planting part 50 reaches the lowest position, the transmission clutch 140 is in a connected state and the planting clutch 170 is in a disconnected state. Further, the planting claw 56 is returned to the upper stop position from the position where the planting claw 56 is stopped by the disconnection of the transmission clutch 140. In this state, after the rice transplanter 100 moves to an appropriate position for planting work, the operation lever 38 is connected. By this connection operation, the planting clutch 170 is switched from the disconnected state to the connected state.

  When the planting clutch 170 starts the connection operation, the interlocking mechanism 200 operates. In the interlocking mechanism 200, the planting clutch side second interlocking member 222 is pushed and moved in the clutch engagement direction via the link member 225 by the operation of the planting clutch operating member 176. By the movement of the planting clutch side second interlocking member 222, the engagement state between the cam surface 222c and the engaging protrusion 215 of the transmission clutch side second interlocking member 212 is released, and the pushing surface 222b is engaged with the engaging protrusion 215. Engage with. Thus, the planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 change from the released state to the linked state.

  At this time, the transmission clutch side second interlocking member 212 does not swing as the planting clutch side second interlocking member 222 moves. That is, the connected state of the transmission clutch 140 is maintained. Therefore, the transmission clutch 140 and the two clutches of the planting clutch 170 on the downstream side of the power transmission path are both connected, and the power of the engine 12 is transmitted to the planting unit 50. Therefore, it is possible to restart the planting work by driving the planting claws 56.

  As described above, the rice transplanter 100 according to the embodiment of the present invention includes the traveling unit 10, the planting unit 50, the planting clutch 170, and the transmission clutch 140. The traveling unit 10 includes an engine (power source) 12. The planting part 50 has the planting nail | claw 56, and is connected with the driving | running | working part 10 so that raising / lowering is possible. The planting claw 56 is configured to take out a seedling from a seedling mat on the seedling placing stand 57 and plant it in the field G while moving along with the rotation of the rotary case 55 when power is transmitted from the engine 12. Yes. The planting clutch 170 is configured to be able to transmit power to the planting claw 56 at the time of connection, and is configured to be cut off at the time of disconnection, and when switching from the connected state to the disconnected state, from the start to the end of the cutting operation. In the meantime, the planting claw 56 is configured to be able to transmit power to the planting claw 56 so that it moves to its reference position (upper stop position). The transmission clutch 140 is disposed on the upstream side of the planting clutch 170 in the power transmission path from the engine 12 to the planting claw 56.

  According to this configuration, when the power to the planting claw 56 is cut off, it is possible to select whether the planting claw 56 is moved to the reference position or held at the position at that time. That is, when the power to the planting claw 56 is cut off, if the planting clutch 170 is switched from the connected state to the disconnected state while the transmission clutch 140 is maintained in the connected state, the planting claw 56 is set to the reference. It can be moved to a position. On the other hand, when the transmission clutch 140 is switched from the connected state to the disconnected state when the power to the planting claw 56 is cut off, the planting claw 56 can be held at the current position.

  For example, when the planting section 50 is raised and the planting clutch 170 is to be disconnected when the planting operation is interrupted or terminated, the transmission clutch 140 is set substantially simultaneously with the cutting operation of the planting clutch 170 or the planting clutch 170. If the cutting operation is performed earlier than the cutting operation, the power to the downstream side of the transmission clutch 140 in the power transmission path is cut off, and the movement of the planting claws 56 to the reference position can be stopped. Therefore, in the case where the planting claw 56 has a configuration for returning the planting claw 56 to the reference position, and the planting claw 56 takes out the seedling from the seedling mat on the seedling mounting table 57 and holds it when the planting operation is interrupted or ended. Even so, the planting claw 56 is prevented from moving to the reference position when the planting part 50 is raised, and the seedling held by the planting claw 56 falls off or scatters from the planting claw 56. Or being released into the field G.

  The rice transplanter 100 according to the embodiment of the present invention further includes an interlocking mechanism 200 and a check mechanism 250. The interlocking mechanism 200 operatively connects the planting clutch 170 and the transmission clutch 140 so that the transmission state of the transmission clutch 140 is switched in accordance with the switching of the transmission state of the planting clutch 170. The interlocking mechanism 200 is configured to place the transmission clutch 140 in the disconnected state as soon as possible after the planting clutch 170 starts the disconnecting operation and until the disconnecting operation ends. The check mechanism 250 prohibits the operation of the interlock mechanism 200 so as to allow the transmission clutch 140 to be in the clutch engaged state while the planting clutch 170 remains in the clutch disengaged state.

  In the rice transplanter 100, the transmission clutch 140 has a transmission clutch main body (the first clutch forming body 141 and the second clutch forming body 142) and the transmission clutch urging member 143, and is not subjected to an external operation force. Is configured to be maintained in the connected state by the urging force of the transmission clutch urging member 143.

  The interlocking mechanism 200 includes a planting clutch side interlocking member 220 and a transmission clutch side interlocking member 210. The planting clutch side interlocking member 220 moves in response to switching of the transmission state of the planting clutch 170. The transmission clutch side interlocking member 210 moves in response to switching of the transmission state of the transmission clutch 140.

  The planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 are configured to be able to take a linked state and a released state. The linked states are linked so that the transmission clutch 140 switches from the connected state to the disconnected state against the urging force of the transmission clutch urging member 143 in accordance with the switching operation of the planting clutch 170 from the connected state to the disconnected state. It is the state that was done. The released state is a state in which the linked state is released so as to allow the transmission clutch 140 to be connected by the urging force of the transmission clutch urging member 143 regardless of the transmission state of the planting clutch 170. It is.

  The check mechanism 250 is connected to the planting unit 50 and the interlocking unit so that the planting clutch side interlocking member 220 and the transmission clutch side interlocking member 210 are released according to the descending operation of the planting unit 50 from the ascending position to the descending position. The mechanisms 200 are operatively connected.

  Further, in the rice transplanter 100, the planting clutch 170 includes a planting clutch body (a third clutch forming body 173 and a fourth clutch forming body 174) and a planting clutch operating member 176. The planting clutch actuating member 176 performs a clutch connecting / disconnecting operation with respect to the planting clutch body in accordance with an artificial operation on the operation lever 38.

  The transmission clutch side interlocking member 210 can swing in the clutch connecting direction and the clutch disengaging direction around the first reference shaft 241, and an engagement protrusion 215 is provided on the free end side.

  The planting clutch side interlocking member 220 includes a planting clutch side first interlocking member 221, a planting clutch side second interlocking member 222, and a planting clutch side interlocking member engaging biasing member 223. The planting clutch side first interlocking member 221 is clutched around a second reference axis (first reference axis 241) parallel to the first reference axis 241 in accordance with the clutch connecting operation and clutch disconnecting operation of the planting clutch actuating member 176. Swings in the connecting direction and the clutch disengaging direction. The planting clutch side second interlocking member 222 is connected to and engaged with the planting clutch side first interlocking member 221 so as to be swingable around a third reference shaft 243 parallel to the second reference shaft (first reference shaft 241). An engagement surface 222 a that engages with the mating protrusion 215 is provided. The planting clutch side interlocking member engaging biasing member 223 applies the planting clutch side second interlocking member 222 to one side around the third reference shaft 243 so that the engaging protrusion 215 engages with the engaging surface 222a. Rush.

  The engaging surface 222a has a pushing surface 222b. The pushing surface 222b swings in the clutch disengagement direction around the second reference shaft (first reference shaft 241) when the planting clutch side first interlocking member 221 is engaged with the engagement surface 222a engaged with the engagement protrusion 215. When moved, the transmission clutch side interlocking member 210 is pushed around the first reference shaft 241 in the clutch disengagement direction via the engagement protrusion 215.

  The check mechanism 250 includes a planting part-side first interlocking member 251, a planting part-side second interlocking member 252, and a long connecting member 253. The planting part side first interlocking member 251 swings in the ascending direction (upward) and the descending direction (downward) around the fourth reference shaft 244 in conjunction with the ascending operation and the descending operation of the planting part 50. The planting part side second interlocking member 252 can swing around the fifth reference axis 245 parallel to the fourth reference axis 244. The planting part side second interlocking member 252 moves in the upward direction around the fifth reference axis 245 according to the swinging in the upward direction and the downward direction around the fourth reference axis 244 of the planting part side first interlocking member 251. It swings in the downward direction and can swing around the fifth reference shaft 245 independently of the planting part side first interlocking member 251. The long connecting member 253 has one end connected to the planting clutch side second interlocking member 222 and the other end connected to the planting part side second interlocking member 252.

  The long connecting member 253 is engaged with the engaging surface 222a in conjunction with the swinging operation of the planting part side second interlocking member 252 in the downward direction around the fifth reference shaft 245 when the planting part 50 is descending. The transmission clutch side second interlocking member 222 is swung to the other side around the third reference shaft 243 in a direction away from the protrusion 215, so that the transmission clutch 140 is transmitted regardless of the transmission state of the planting clutch 170. While allowing the clutch engagement state to be established by the urging force of the urging member 143, the planting part side second interlocking is performed with the engagement surface 222 a engaged with the engagement protrusion 215 during the ascending operation of the planting part 50. The member 252 is loosened to allow the member 252 to swing around the fifth reference axis 245 in the upward direction.

  The engagement surface 222a further has a cam surface 222c. The cam surface 222c is configured such that the transmission clutch 140 is in a connected state while the planting clutch 170 is in a disconnected state when the planting clutch side second interlocking member 222 is swung to the other side around the third reference shaft 243. When engaged, it engages with the engaging protrusion 215.

  With the engagement protrusion 215 engaged with the cam surface 222c, the planting clutch 170 is switched from the disconnected state to the connected state, and the planting clutch side first interlocking member 221 is moved to the second reference shaft (first reference shaft 241). ) When swung in the direction in which the rotating clutch is connected, the planting clutch side second interlocking member 222 is swung around the third reference shaft 243 to the other side by the engaging protrusion 215 and the cam surface 222c, and the engaging protrusion 215 is moved. The state returns to the state of engaging with the pushing surface 222b.

  In the rice transplanter 100, the first reference axis 241 is coaxial with the second reference axis. In the present embodiment, the structure is simplified as a configuration in which the first reference shaft 241 also serves as the second reference shaft.

  The rice transplanter 100 also includes a neutral position biasing member 255 that returns the planting part-side second interlocking member 252 to the neutral position around the fifth reference shaft 245.

  According to this configuration, for example, when the planting part 50 is raised with the interruption or termination of the planting operation, the transmission clutch 140 is substantially simultaneously with the disconnecting operation of the planting clutch 170 or the disconnecting operation of the planting clutch 170. If it is cut earlier, power is not transmitted to the planting clutch 170. As a result, the planting claw 56 does not move to the reference position. Therefore, even when the planting claw 56 takes out and holds the seedling from the seedling mat on the seedling placing stand 57 at the time when the planting operation is interrupted or finished, the planting portion 50 is planted when the planting unit 50 is raised. The movement of the attached claw 56 to the reference position can be prevented, and the seedlings held by the planted claw 56 can be prevented from falling off or scattered from the planted claw 56 and being released to the field G.

  Furthermore, when lowering the planting part 50 with the start of the planting operation, the transmission clutch 140 is connected in the middle of the lowering, and the power is transmitted to the planting clutch 170 in the middle of the cutting operation. As a result, the planting clutch 170 resumes the cutting operation, and at the end of the cutting operation, the planting claw 56 moves to the upper stop position (reference position). At this time, since the planting claws 56 are approaching the field G due to the descending of the planting unit 50, the seedlings held by the planting claws 56 are moved to the field G before the planting claws 56 move to the reference position. Planted. Therefore, the seedlings fall off from the planting claws 56 or scatter and are not released to the field G, that is, do not float on the field (water surface) W.

  Further, when the rice transplanter 100 is moved in a state where the planting part 50 is lowered, the planting claws 56 are in the upper stop position where they do not contact the seedling mat and the field scene W, so that the planting claws 56 are cultivated in the field G. There is no change by dragging down on the board g, and seedling clogging does not occur.

  In addition to the embodiments described herein, the present invention can take various modifications and variations from the viewpoint of the above description. It is therefore contemplated that the invention may be practiced otherwise than as described herein within the scope of the appended claims.

DESCRIPTION OF SYMBOLS 10 Traveling part 12 Engine 50 Planting part 56 Planting claw 57 Seedling stand 140 Transmission clutch 170 Planting clutch 200 Interlocking mechanism 210 Transmission clutch side interlocking member 220 Planting clutch side interlocking member 250 Checking mechanism

Claims (5)

A traveling unit having a power source;
It has a planting claw configured to take out a seedling from a seedling mat on a seedling stage while it is moved by transmitting power from the power source and plant it on a field, and is connected to the traveling unit so as to be able to move up and down Planted part,
While the power to the planting claw can be transmitted at the time of connection, the planting nail is configured to be cut off at the time of disconnection, and when switching from the connected state to the disconnected state, A planting clutch configured to transmit power to the planting claw so that the claw moves to its reference position;
A transmission clutch disposed upstream of the planting clutch in the power transmission path from the power source to the planting claw, and for switching transmission or interruption of power from the power source to the planting claw; ,
An interlocking mechanism that operatively connects the planting clutch and the transmission clutch so that the transmission state of the transmission clutch is switched in response to switching of the transmission state of the planting clutch;
A rice transplanter comprising a check mechanism that inhibits the operation of the interlocking mechanism so as to allow the transmission clutch to be in a clutch engaged state while the planting clutch remains in a clutch disengaged state . The transmission clutch includes a transmission clutch main body and a transmission clutch biasing member, and is configured to be maintained in a connected state by the biasing force of the transmission clutch biasing member in a state where no operation force is applied from the outside. And
The interlocking mechanism has a planting clutch side interlocking member that moves according to switching of the transmission state of the planting clutch, and a transmission clutch side interlocking member that moves according to switching of the transmission state of the transmission clutch,
The planting clutch side interlocking member and the transmission clutch side interlocking member are configured such that the transmission clutch resists the biasing force of the transmission clutch biasing member in response to a switching operation from the connected state of the planting clutch to the disconnected state. The transmission clutch is allowed to be connected by the urging force of the transmission clutch urging member regardless of the linkage state linked to each other so as to switch from the connected state to the disconnected state and the transmission state of the planting clutch. Configured to be able to take a released state in which the mutual linkage state is released,
The check mechanism is configured so that the planting clutch side interlocking member and the transmission clutch side interlocking member are in a released state in accordance with a descending operation from the ascending position of the planting unit to the descending position. The rice transplanter according to claim 1 , wherein the interlocking mechanisms are operatively connected. The planting clutch has a planting clutch main body and a planting clutch actuating member that performs a clutch connecting / disconnecting operation with respect to the planting clutch main body according to an artificial operation,
The transmission clutch side interlocking member is swingable in the clutch connecting direction and the clutch disengaging direction around the first reference axis, and an engagement protrusion is provided on the free end side,
The planting clutch side interlocking member swings in a clutch connecting direction and a clutch disconnecting direction about a second reference axis parallel to the first reference axis in accordance with a clutch connecting operation and a clutch disconnecting operation of the planting clutch operating member. A first engaging member on the side of the planting clutch that engages with the first interlocking member on the side of the planting clutch so as to be swingable about a third reference axis that is parallel to the second reference axis and engages with the engaging protrusion. The planting clutch side second interlocking member provided with an engagement surface, and the planting clutch side second interlocking member around the third reference axis so that the engagement protrusion engages with the engagement surface. A urging member for engaging a planting clutch side interlocking member that urges toward the side,
The engaging surface engages with the engagement surface when the engaging clutch side first interlocking member is swung in the clutch disengagement direction around the second reference axis in a state where the engaging surface is engaged with the engaging protrusion. Having a pushing surface for pushing the transmission clutch side interlocking member around the first reference axis in the clutch disengagement direction via a mating protrusion;
The check mechanism includes a planting portion-side first interlocking member that swings in a rising direction and a descending direction around a fourth reference axis in conjunction with an ascending operation and a descending operation of the planting portion, and the fourth reference shaft. A planting part side second interlocking member capable of swinging around a parallel fifth reference axis, wherein the planting part side first interlocking member swings in the upward and downward directions around the fourth reference axis. A planting that swings in the upward and downward directions around the fifth reference axis in accordance with the movement and that can swing around the fifth reference axis independently of the first interlocking member on the planting portion side. A part-side second interlocking member, and a long connecting member having one end connected to the planting clutch-side second interlocking member and the other end connected to the planting-part-side second interlocking member,
The long connecting member is engaged with the engaging surface in conjunction with the swinging motion of the second interlocking member-side second interlocking member in the downward direction around the fifth reference axis when the planting portion is descending. The planting clutch side second interlocking member is swung to the other side around the third reference axis in a direction away from the mating projection, so that the transmission clutch is independent of the transmission state of the planting clutch. While allowing the clutch engagement state to be established by the urging force of the clutch urging member, the planting portion side second member is engaged with the engagement projection when the planting portion is raised. The interlocking member is slackened to allow it to swing in the upward direction around the fifth reference axis;
The engagement surface is further connected to the transmission clutch while the planting clutch is in the disconnected state by the second clutch-side second interlocking member being swung to the other side around the third reference axis. Having a cam surface that engages with the engaging projection when
With the engaging protrusion engaged with the cam surface, the planting clutch is switched from the disconnected state to the connected state, and the planting clutch side first interlocking member moves in the direction of clutch connection around the second reference shaft. When swung, the planting clutch side second interlocking member is swung to the other side around the third reference axis by the engaging projection and the cam surface, and the engaging projection is engaged with the push surface. The rice transplanter according to claim 2 , wherein the rice transplanter returns to a matching state. The rice transplanter according to claim 3 , wherein the first reference axis and the second reference axis are coaxial. Planting machine according to claim 3 or 4, characterized in that it comprises a neutral position biasing member for returning the second interlocking member the planting portion in the fifth reference axis neutral position.

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