JP2019115298A5 - - Google Patents

Description

Work vehicle

  The present invention relates to a work vehicle.

  Conventionally, a work vehicle connected with a seedling planting device as a working device has been provided with a mechanism for engaging all the hook clutches in conjunction with the raising operation of the seedling planting device, and the seedling planting device is raised. A mechanism is provided that enables the disengagement operation for any saddle clutch when in the state. (For example, see Patent Document 1)

JP 2002-262624 A

  However, in the case of Patent Document 1, a mechanism that engages the hook clutch in conjunction with the raising operation of the seedling planting device includes a hook clutch lever that manually operates the hook clutch in conjunction with the raising action. There is a member that moves directly in the “clutch” direction, and this member is always in contact with the saddle clutch lever even when the seedling planting device is raised (the contact is also in the lowered state). ). For this reason, there is a problem that the operating resistance is increased in the operation of the retracting clutch lever for disengaging an arbitrary retracting clutch among the retracting clutches returned to the full-row planting state.

  In view of the problems of the conventional work vehicle described above, the present invention is a work that can reduce the operation resistance in the turning operation of the partial clutch lever that performs the switching operation of partially entering or turning off the predetermined work of the working device. The object is to provide a vehicle.

If the first invention, the vehicle body (2), and working device (50) which is vertically movably coupled to the vehicle body (2), partially halting the work of the working device (50) whether the switching operation between the line power sale parts partial clutch lever (61, 62, 63), the return device for returning the partial clutch lever (61, 62, 63) to a state to work from a state of being the rest (200) The return device (200) is brought into contact with the partial clutch levers (61, 62, 63) in conjunction with the working device (50) being raised to a predetermined position. after the 61, 62 and 63) is moved in a direction to said return, said the predetermined direction back in the opposite direction, is a work vehicle, wherein the benzalkonium to release the abutment.

The second of the present invention, before Kifuku return device (200) includes a first actuating member (220) mounted for rotation, in conjunction with the rise of the working device (50) the first actuating member ( 220) and the second operating member (230) for rotating the first operating member (220) in a predetermined direction, and the partial clutch lever (61, 62, 63) and the partial clutch lever (61, 62, 63). 61, 62, 63) having a return arm member (240) for moving in the return direction, and a connecting member (250) for connecting the first actuating member (220) and the return arm member (240), After the first actuating member (220) is rotated in the predetermined direction by the contact of the second actuating member (230), the working device (50) is further raised, so that the second actuating member ( 230) is the first actuating member. Away from 220), the first actuating member (220) is a work vehicle of the first invention, wherein the rotation to Turkey in the predetermined direction and the opposite direction.

The third of the present invention, prior Symbol second actuating member (230) has one end rotatably attached to the elevating link member (100), the other end of the first actuating member (220) The second operating member (230) comes into contact with the first operating member (220) when the working device (50) is raised to the predetermined position. (220) rotates, and when the working device (50) descends from the ascending side to the predetermined position from the predetermined position, the second operating member comes into contact with an edge of the first operating member (220). The work vehicle according to the second aspect of the present invention is characterized in that (230) rotates to suppress the rotation of the first operating member (220) .

According to a fourth aspect of the present invention, the urging member (260) for urging the first operating member (220) in a direction opposite to the predetermined direction is attached to the first or second operating member (220) . It is a work vehicle of the work vehicle of this invention.

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According to the first aspect of the present invention, since the return device releases the contact after moving the partial clutch lever in the return direction, the return device is resistant to the switching operation by the partial clutch lever for partially stopping a predetermined operation. Can be relaxed.
Further, since the return device operates in conjunction with the work device being raised to a predetermined position, for example, when the traveling vehicle body is turned and moved backward to move to the next work process, the work device is raised. Therefore, when starting the work in the next work process, the partial clutch lever is always returned to the "clutch engaged position" by the return device, so that it is possible to prevent forgetting to put on the partial clutch and reduce the burden on the operator. Efficiency can be improved.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention , the return device can be configured with a simple configuration by using, for example, a cable as the connecting member .

According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, when the working device is lowered from the position further raised from the predetermined position, the other end portion of the second working member is an arc shape of the first working member. Therefore, the rotation of the first actuating member can be suppressed .

According to the fourth aspect of the present invention, in addition to the effects of the second or third aspect of the present invention, when the second operating member moves away from the first operating member and the first operating member rotates in the direction opposite to the predetermined direction, the reverse is achieved. The rotating operation in the direction is quickly and reliably performed by the biasing member .

(Delete)

The left view of the riding rice transplanter in embodiment concerning this invention Plan view of riding rice transplanter in the present embodiment The principal part expansion side view of the left side of the body which shows the restoration device of the riding rice transplanter in this embodiment In the riding rice transplanter of the present embodiment, the main part enlarged side view showing the return cam provided on the return cam support stay and the crank arm provided on the upper link arm when the lifting link device is at the lowest lowered position. Figure Schematic perspective view of the return cam and crank arm of FIG. The plane schematic diagram which shows typically the internal structure of the lever attachment frame in the riding rice transplanter of this Embodiment The principal part enlarged side view which shows the state just before a roller contact | abuts to the 1st edge part of a return cam in the middle of the raising / lowering link apparatus in the riding rice transplanter of this Embodiment rising from the lowest-falling position. While the lifting link device in the riding rice transplanter according to the present embodiment is further raised toward the highest position, after the roller rotates the return cam, the contact with the first edge by the roller is completed. , Enlarged side view of the main part showing the state immediately before the return cam tries to return to the original position (initial position) (A): It is the schematic left view which looked at the lever mounting frame in the riding rice transplanter of this Embodiment from the left side, and the schematic which shows the state in which a 1st partial clutch lever exists in a "clutch disconnection position", (b) ): Schematic left side view of the lever mounting frame as viewed from the left side, showing the state when the first partial clutch lever is forcibly moved from the “clutch disengagement position” to the “clutch engagement position”. The principal part expansion side view which shows the state which a roller moves along the 2nd edge part of a return cam in the middle of the raising / lowering link apparatus in the riding rice transplanter of this Embodiment falling from the highest position.

  Hereinafter, a six-row riding rice transplanter according to an embodiment of the work vehicle of the present invention will be described with reference to the drawings.

  FIG.1 and FIG.2 is the left view and top view of the riding rice transplanter concerning this Embodiment.

  As shown in FIGS. 1 and 2, the riding rice transplanter 1 according to the present embodiment has a planting device 50 mounted on the rear side of the traveling vehicle body 2 so as to be movable up and down via a lifting link device 100. A fertilizer hopper 3 is provided on the upper rear side. The lifting link device 100 is a parallel link including an upper link arm 110 and a lower link arm 120 (see FIGS. 1 and 3).

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 4 and 4 and a pair of left and right rear wheels 5 and 5 as drive wheels.

  Also, the front end of the vehicle body main frame 7 is fixed to the rear surface of the transmission case 6, while the left and right ends of the vehicle body main frame 7 support the lifting link device 100 so as to be rotatable. A pair of link support stays 10 are fixed.

  The engine 20 is mounted on the vehicle body main frame 7, and the rotational power of the engine 20 is transmitted to the transmission case 6 via a belt transmission and an HST (hydrostatic continuously variable transmission). The rotational power transmitted to the transmission case 6 is shifted by a speed change mechanism in the transmission case 6 and then separated into traveling power and external power to be extracted. The traveling power drives the front wheels 4 and 4 and the left and right rear wheels 5 and 5.

  Moreover, the external take-out power taken out from the transmission case 6 is transmitted to the planting device 50 by the planting transmission shaft 21 via a planting clutch (not shown).

  Moreover, as shown in FIG. 1, FIG. 2, the planting apparatus 50 is provided with the 1st seedling planting part 51, the 2nd seedling planting part 52, and the 3rd seedling planting part 53, and by each seedling planting part, A total of 6 seedlings are planted in the field by 2 strips.

  That is, in each of the first seedling planting part 51 to the third seedling planting part 53, two planting tools 55 having claws for planting seedlings are driven from the planting transmission shaft 21 on each of the left and right sides. It is arranged so that it can be rotated by force.

  In addition, the driving force from the planting transmission shaft 21 is configured to be able to enter and exit individually with respect to each of the first seedling planting unit 51 to the third seedling planting unit 53 via a partial clutch mechanism (not shown). ing.

  That is, the partial clutch mechanism of the riding rice transplanter 1 according to the present embodiment includes a first partial clutch device and a second part provided corresponding to each of the first seedling planting unit 51 to the third seedling planting unit 53. The mechanism is constituted by a clutch device and a third partial clutch device (not shown), and is a mechanism that allows the planting operations in the first seedling planting unit 51 to the third seedling planting unit 53 to be individually entered and separated.

  Also, a first partial clutch lever 61, a second partial clutch lever 62, and a third portion for individually performing on / off switching operations of the first partial clutch device, the second partial clutch device, and the third partial clutch device. A clutch lever 63 is rotatably provided on a lever mounting frame 60 on the left side of the control seat 22 disposed on the engine cover 21 (see FIGS. 1 and 2).

  Further, the first partial clutch lever 61, the second partial clutch lever 62, and the third partial clutch lever 63 can be rotated by a lever mounting frame 60 fixed to the floor stay 11 that fixes the floor step 23 at the rear end. (See FIG. 3). In addition, the structure of attachment of these partial clutch levers 61-63 is further mentioned later using FIG. 3, FIG.

  A steering handle 24 is provided in front of the steering seat 22. On the right or left side of the steering handle 24, the traveling vehicle 2 can be switched between forward traveling and backward traveling, the traveling speed can be set, and the planting device 50 can be moved up and down and the planting operation can be turned on and off. Various work operation levers (not shown) are provided.

In the riding rice transplanter 1 according to the present embodiment, when the traveling vehicle body 2 turns or reversely travels, the elevating link device 100 rises in conjunction with these operations, thereby the planting device 50.
The planting operation is stopped as the height rises.

  In the riding rice transplanter 1 according to the present embodiment, the first partial clutch lever 61 to the third portion are interlocked with the ascending operation of the planting device 50, that is, when the lifting link device 100 is raised to a predetermined height. Regardless of which partial clutch lever of the clutch lever 63 is set to the “clutch disengagement position”, the return device 200 that forcibly returns all the partial clutch levers 61 to 63 to the “clutch engagement position”. I have.

  According to the return device 200 of the present embodiment, all the partial clutch levers 61 to 63 are forcibly returned to the “clutch engaged position” to place all the first partial clutches to the third partial clutches in the “engaged” state. Since any partial clutch lever immediately shifts to the non-contact state after setting to, the partial clutch lever corresponding to the partial clutch is set to “clutch” in order to set any partial clutch to the “disengaged” state again. When operated to the “cutting position” side, the operation resistance is reduced as compared with the prior art, and the switching operation can be performed easily.

  The traveling vehicle body 2 of the present embodiment is an example of the traveling vehicle body of the present invention, and the planting device 50 of the present embodiment is an example of the working device of the present invention. The lever mounting frame 60 of the present embodiment is an example of the mounting frame of the present invention, and the first partial clutch lever 61 to the third partial clutch lever 63 of the present embodiment are examples of the partial clutch lever of the present invention. It hits. The return device 200 of the present embodiment is an example of the return device of the present invention, and the lift link device 100 of the present embodiment is an example of the lift link member of the present invention.

  Next, the return device 200 of the present embodiment will be described mainly with reference to FIGS.

  FIG. 3 is an enlarged side view of the main part of the left side of the fuselage showing the return device 200.

  4 shows the return cam 220 provided on the return cam support stay 210 and the upper link arm 110 when the lifting link device 100 is in the lowest lowered position, that is, when the planting device 50 is in the planting position. FIG. 5 is an enlarged side view of a main part showing a crank arm 230.

  FIG. 5 is a schematic perspective view of the return cam 220 and the crank arm 230 shown in FIG.

  FIG. 6 is a schematic plan view schematically showing the internal structure of the lever mounting frame 60.

  As shown in FIG.

(1) A return cam support stay 210 that is fixed to the left link support stay 10 so that the attachment position can be adjusted, and has a substantially right triangle shape in a side view and a front end portion 211 bent at a right angle in a plan view. When,

(2) a return cam 220 rotatably attached to the rear end portion of the return cam support stay 210;

(3) When the upper link arm 110 rises to a predetermined height, the crank shape attached to the upper link arm 110 so as to be pivoted counterclockwise in contact with the return cam 220 and viewed from the left side view. A crank arm 230 formed,

(4) Of the first partial clutch lever 61 to the third partial clutch lever 63, abut on a switching arm 61a (62a, 63a) provided on the rear end side of the partial clutch lever located at the “clutch disengagement position”. A full return arm 240 rotatably attached to the lever mounting frame 60 for forcibly moving the partial clutch lever to the “clutch position”;

(5) A connecting cable 250 that connects the return cam 220 and the full-line return arm 240 is provided.

  As shown in FIG. 4, the return cam 220 has a protruding portion 221 protruding downward in the front side, and a rear end portion of the connecting cable 250 is rotatably connected via a fixture 251. A first edge 222 that linearly extends rearward from the lower edge 221a of the lower edge 221a, and a second curve that rises rapidly from the first edge 222 and smoothly curves forward. Edge 223. Further, a torque spring 260 is wound around the outer peripheral surface of the cam rotation shaft 212 erected on the rear end upper portion of the left side surface of the return cam support stay 210, and one end (not shown) thereof is fixed at a predetermined position. The other end 261 is hooked on the upper recess 224 of the return cam 220. Thereby, the return cam 220 is always urged clockwise in the left side view with the cam rotation shaft 212 as the rotation center (see arrow A in FIG. 4). Therefore, after the upper link arm 110 is raised and the crank arm 230 rotates the return cam 220 counterclockwise in the left side view, the return cam 220 rotates clockwise by moving away from the return cam 220. In this case, the turning operation is performed quickly and reliably.

  However, since the return cam 220 is provided with a stopper (not shown) in order to effectively apply the urging force of the torque spring 260, the initial position where the first edge 222 is in a horizontal state (FIG. 4). (See reference), and no further clockwise rotation.

  In addition, the crank arm 230 has an upper crank arm portion 231a that is rotatably inserted into a hole of a cylindrical crank support holder 111 that is welded and fixed to the upper surface of the upper link arm 110 (FIG. 5). reference). Furthermore, a split pin (not shown) is attached to the tip of the upper crank arm portion 231a so that the upper crank arm portion 231a does not come off.

  In addition, the crank arm 230 is rotatably held by a roller 233 that can come into contact with the first edge 222 and the second edge 223 of the return cam 220 at the tip of the lower crank arm 231b. . The roller 233 has a cylindrical shape, and in order to ensure that the outer peripheral surface of the roller 233 can come into contact without being detached from the first edge 222 and the second edge 223 of the return cam 220, Disc-shaped guide flanges 233a are provided at both ends.

  A stopper pin 112 is fixed to the lower surface 110a of the upper link arm 110 by welding. As a result, the crank arm base 232 connecting the upper crank arm portion 231a and the lower crank arm portion 231b of the crank arm 230 contacts the stopper pin 112 at a position substantially orthogonal to the upper link arm 110 in the left side view. The crank arm 230 does not further rotate clockwise around the upper crank arm portion 231a.

  Further, one end portion 271 of the tension spring 270 is connected to the base side of the lower crank arm portion 231b, and is fixed to the lower surface 110a of the upper link arm 110 on the front side from the fixing position of the stopper pin 112. The other end 272 of the tension spring 270 is connected to the spring fixing pin 113.

  As a result, the crank arm 230 is constantly urged in the clockwise rotation direction with the upper crank arm portion 231a as the rotation center by the action of the restoring force (the force to shrink) of the tension spring 270.

  Here, the configuration of the lever mounting frame 60 and the mounting configuration of the first partial clutch lever 61, the second partial clutch lever 62, and the third partial clutch lever 63 to the lever mounting frame 60 will be described with reference to FIGS. Further explanation will be given.

  That is, as shown in FIG. 6, the lever mounting frame 60 is provided with a lever support shaft 65 having a circular cross section with both end portions 65a fixed to the left and right side wall portions 60a.

  On the other hand, at the rear ends of the first partial clutch lever 61, the second partial clutch lever 62, and the third partial clutch lever 63, a cylindrical first lever base 61b, second lever base 62b, and third lever are provided. A base 63b is fixed by welding, and a first lever switching arm 61a and a second lever switching arm are provided on the back side of the outer peripheral surface of the first lever base 61b, the second lever base 62b, and the third lever base 63b. 62a and the third lever switching arm 63a are fixed by welding so as to protrude rearward (see FIG. 6).

  The lever support shaft 65 is disposed through the through holes of the first lever base 61b to the third lever base 63b, and rotatably supports the first partial clutch lever 61 to the third partial clutch lever 63. is doing.

  Furthermore, since the first partial clutch lever 61 to the third partial clutch lever 63 are respectively provided with assist springs 64 (see FIG. 3) that exceed the dead center, the first partial clutch lever 61 to the third partial clutch lever. In the switching operation from “clutch engaged position” to “clutch disengaged position” 63 and switching operation from “clutch disengaged position” to “clutch engaged position” of 63, the first partial clutch lever 61 to the third partial clutch lever After the dead spring over assisting spring 64 exceeds the dead center only by moving each part 63 halfway, the first partial clutch lever 61 to the third partial clutch lever 63 are moved by the action of the force to shrink. It is configured to reach the “clutch disengagement position” or “clutch engagement position”.

  Further, as shown in FIGS. 3 and 6, the full-line return arm 240 has the left and right short sides 241 </ b> L and 241 </ b> R with tip ends 241 </ b> La and 241 </ b> Ra rotatably attached to the lever support shaft 65. It has a substantially U-shape when viewed, and a long side portion 241C at the center thereof is formed so as to be in contact with any lower surface of the first lever switching arm 61a to the third lever switching arm 63a.

  In addition, the front end portion of the connecting cable 250 is rotatably connected to the central long side portion 241C via a fixture 251 (see FIG. 6).

  The return cam 220 of the present embodiment is an example of the first operating member of the present invention, and the crank arm 230 of the present embodiment is an example of the second operating member of the present invention. Further, the full-arm return arm 240 of the present embodiment corresponds to an example of the return arm member of the present invention, and the connection cable 250 of the present embodiment corresponds to an example of the connection member of the present invention.

  Next, the operation of the return device 200 according to the present embodiment will be described mainly with reference to FIGS.

  FIG. 7 is an enlarged side view of a main part showing a state immediately before the roller 233 comes into contact with the first edge 222 of the return cam 220 while the lifting / lowering link device 100 is rising from the lowest position.

  Further, FIG. 8 shows that the roller 233 rotates the return cam 220 while the elevating link device 100 is further raised toward the highest position, and then the contact of the roller 233 with the first edge 222 is completed. And it is a principal part expanded side view which shows the state just before the return cam 220 tries to return to the original position (initial position).

  FIG. 9A is a schematic left side view of the lever mounting frame 60 as viewed from the left side, and is a schematic diagram showing a state in which the first partial clutch lever 61 is in the “clutch disengagement position”. (B) is a schematic left side view of the lever mounting frame 60 as viewed from the left side, when the first partial clutch lever 61 is forcibly moved from the “clutch disengagement position” to the “clutch engagement position”. It is the schematic which shows a state. In FIGS. 9A and 9B, the second partial clutch lever 62 and the third partial clutch lever 63 are both positioned at the “clutch engaged position”, but their illustration is omitted. did.

  The posture of the return cam 220 corresponding to the posture of the full-line return arm 240 shown in FIG. 9A is a posture obtained by further rotating the return cam 220 shown in FIG. The posture of the return cam 220 corresponding to the posture of the full-row return arm 240 shown in FIG. 9B is shown in FIG.

  Here, in the riding rice transplanter 1 according to the present embodiment, the operator sets only the first partial clutch lever 61 to the “clutch disengagement position” (see FIG. 9A), so that the first partial clutch ( (Not shown in the figure) only in the “cut” state, that is, the four-row planting is performed, and after the completion of the operation, it is turned and moved to the headland to perform the next planting operation. The operation will be described by taking the scene to start as an example.

  During the above-mentioned planting operation of the riding rice transplanter 1, the elevating link device 100 is located at the lowest lowered position, so that the roller 233 of the crank arm 230 attached to the upper link arm 110 is attached to the return cam 220. It is located below and does not contact the return cam 220 (see FIGS. 4 and 5).

  Next, when the planting work on the shore is finished and the operator turns the riding rice transplanter 1, the planting work is stopped and the planting device 50 is raised to the highest position in conjunction with the turning operation. Therefore, the lifting / lowering link device 100 starts to rise (see arrow B in FIG. 7).

  Then, when the roller 233 rising in the arrow B direction together with the upper link arm 110 contacts the first edge 222 of the return cam 220 as shown in FIG. The cam 220 is pushed up by the roller 233 and starts rotating counterclockwise around the cam rotation shaft 212 as a center of rotation (see arrow B ′ in FIG. 7).

  As the return cam 220 starts to rotate in the direction of the arrow B ′, the connecting cable 250 is pulled rearward (see the arrow P in FIGS. 7 and 9A). The central long side portion 241C of the connected full-line return arm 240 starts to rotate counterclockwise around the lever support shaft 65 (see arrow B in FIG. 9A).

  Thereafter, when the lifting / lowering link device 100 is further raised toward the highest position, the return cam 220 is further pushed up by the roller 233 (see FIG. 8), and the connecting cable 250 is further pulled rearward. The central long side portion 241C of the first partial clutch lever 61 is further rotated counterclockwise and is in contact with the lower surface of the first lever switching arm 61a of the first partial clutch lever 61. By rotating counterclockwise as viewed from the left side, the first partial clutch lever 61 is centered on the lever support shaft 65 against the force of the assist spring 64 that is beyond the dead center. Starts turning counterclockwise when viewed from the left side. Thereafter, when the first partial clutch lever 61 continues to rotate counterclockwise as the elevating link device 100 rises, the assist spring 64 exceeding the dead point will eventually exceed the dead point. The first partial clutch lever 61 is pulled to the “clutch engaged position” by the action of the force (see FIG. 9B).

  As a result, when the planting device 50 is raised to a position before reaching the highest lift position, the first partial clutch lever 61 located at the “clutch disengagement position” is reliably returned to the “clutch engagement position”. The

  Here, the case where only the first partial clutch lever 61 is located at the “clutch disengagement position” has been described. However, the present invention is not limited to this, for example, the first partial clutch lever 61 to the third partial clutch lever 63. Needless to say, even when all the partial clutch levers are positioned at the “clutch disengagement position”, all the partial clutch levers are reliably returned to the “clutch engagement position”.

  On the other hand, immediately after the first partial clutch lever 61 returns to the “clutch engaged position”, the lifting link device 100 further rises toward the highest rise position, so that the planting device 50 immediately before reaching the highest rise position. , That is, the roller 233 gets over the boundary 222a (see FIG. 8) between the first edge 222 and the second edge 223 of the return cam 220. After that, the return cam 220 is rotated clockwise as viewed from the left side by the action of the restoring force of the torque spring 260 (see arrow A in FIG. 8), and the rear end portion of the connecting cable 250 faces forward. Move (see arrow Q in FIG. 8).

  As a result, a slack is temporarily generated in the vicinity of the rear end of the connecting cable 250, but due to the slack, the full-strand return arm 240 rotates clockwise with the lever support shaft 65 as the center of rotation under its own weight. And the contact of the long side portion 241C with the first lever switching arm 61a is released, and a non-contact state is established (see FIG. 3).

  That is, after the elevating link device 100 reaches a predetermined height and the roller 233 passes over the boundary portion 222a (see FIG. 8), the return cam 220 is viewed from the left side by the action of the restoring force of the torque spring 260. Is rotated clockwise (see arrow A in FIG. 8), and the connecting cable 250 moves forward (see arrow Q in FIG. 8), so that the full-arm return arm 240 rotates the lever support shaft 65. As a center, it rotates by its own weight in the clockwise direction in the left side view, and the contact of the long side portion 241C with the first lever switching arm 61a is released, so that the long side portion 241C has the first lever switching arm 61a to Any switching arm of the three-lever switching arm 63a is in a non-contact state (see the position of the full-line return arm 240 in FIG. 3).

  Thereby, when any or all of the first partial clutch lever 61 to the third partial clutch lever 63 are located at the “clutch disengagement position”, the full-return return arm 240 is operated, All the partial clutch levers reliably return to the “clutch engagement position”, and immediately after the return, the long side portion 241C of the full-return return arm 240 is connected to the first lever switching arm 61a to the third lever switching arm 63a. Since any of the switching arms is in a non-contact state, when the operator switches any of the first partial clutch lever 61 to the third partial clutch lever 63 to the “clutch disengagement position”, the dead point is exceeded. Except for the point that requires a force to counteract the force of the assist spring 64 (see FIG. 3), the operating resistance is Fried, part clutch lever lightly do it can be a switching operation.

  Next, the operation of each part when the lifting / lowering link device 100 descends from the most elevated position will be described with reference to FIG.

  FIG. 10 is an essential part enlarged side view showing a state in which the roller 233 moves along the second edge 223 of the return cam 220 while the elevating link device 100 is being lowered from the highest position.

  When the lifting link device 100 is located at the highest position, the return cam 220 is located at the initial position as shown in FIG.

  While the lifting / lowering link device 100 is descending from the highest position to the lowest position (see arrow A in FIG. 10), the roller 233 of the crank arm 230 contacts the second edge 223 of the return cam 220. Since the return cam 220 is provided with the stopper (not shown) as described above, the return cam 220 is not further rotated clockwise from the initial position in the left side view.

  Therefore, the roller 233 of the crank arm 230 descends along the second edge 223 of the return cam 220 while resisting the restoring force of the tension spring 270 (the arrow M in FIG. 10). After the boundary portion 222a of the return cam 220 is exceeded, the restoring force of the tension spring 270 is pulled below the first edge portion 222 of the return cam 220, and the crank arm base portion 232 is moved to the upper crank arm portion 231a. Rotate clockwise about the rotation center and stop further rotation while maintaining contact with the stopper pin 112 welded and fixed to the lower surface of the upper link arm 110 and maintain the contact state. .

  Thereby, when the raising / lowering link apparatus 100 descends, the return apparatus 200 does not operate.

  As described above, the mounting position of the return cam support stay 210 with respect to the left link support stay 10 can be adjusted, for example, the mounting height in the vertical direction or the mounting position in the front-rear direction of the return cam support stay 210. Is changed to return the first partial clutch lever 61 to the third partial clutch lever 63 to the “clutch engagement position”, and the long side portion 241C of the full return arm 240 is switched to the first lever switching arm 61a to the third lever. The height of the planting device 50 that is in a non-contact state with any switching arm of the arm 63a can be freely changed, and the timing of the non-contact state can be freely changed by returning as described above. I can do it.

  In addition, by changing the shape of the return cam 220, the first partial clutch lever 61 to the third partial clutch lever 63 are returned to the “clutch engaged position”, and the timing of the non-contact state as described above can be freely changed. In addition, the tensile load by the connecting cable 250 can be freely changed.

  In addition, by adjusting the length of the connecting cable 250, the timing can be freely changed by returning as described above.

  Further, by adjusting the urging force of the torque spring 260, the long side portion 241C of the full return arm 240 is brought into a non-contact state with any of the switching arms of the first lever switching arm 61a to the third lever switching arm 63a. The timing can be changed freely. That is, for example, when the urging force of the torque spring 260 is set strongly, the return cam 220 returns to the initial position more quickly, and the non-contact state is realized more quickly. The timing at which the operator can manually and easily switch any lever of the third partial clutch lever 63 from the “clutch engaged position” to the “clutch disengaged position” is advanced.

  Further, since the full-arm return arm 240 and the return cam 220 of the present embodiment are connected by the connecting cable 250, the connecting cable 250 can be freely routed, the degree of design freedom is high, and the connecting cable 250 is provided. It is hard to load and has high durability. Further, by using such a connecting cable 250, it is possible to perform the full-return operation with one return cam 220 regardless of the number of partial clutch levers, and to reduce the number of parts. I can do it.

  Further, in the return device 200 of the present embodiment, for example, the contact between the central long side portion 241C of the full return arm 240 and the first lever switching arm 61a to the third lever switching arm 63a is a rotational contact, Less wear on contact surface and high durability. In addition, since the full-arm return arm 240 and the return cam 220 of the present embodiment are connected by the connecting cable 250, the sliding portion can be reduced and the durability is high.

  Further, in the return device 200 of the present embodiment, the contact between the central long side portion 241C of the full return arm 240 and the first lever switching arm 61a to the third lever switching arm 63a is a rotational contact, and the long side The part 241C can reliably move the first lever switching arm 61a to the third lever switching arm 63a to a position corresponding to the “clutch engaged position”.

  Further, in the return device 200 of the present embodiment, the lever support shaft 65 that rotatably supports the first partial clutch lever 61 to the third partial clutch lever 63 also serves as the rotary shaft of the full-row return arm 240. The structure is simple and the number of parts can be reduced.

  In the above-described embodiment, the case where the planting device 50 is connected as an example of the working device of the present invention has been described. However, the present invention is not limited to this. For example, the seeding device is connected as another example of the working device. May be.

  Further, in the above-described embodiment, the return device 200 returns the partial clutch lever from the “clutch disengagement position” to the “clutch engagement position” in conjunction with the ascending operation of the elevating link device 100, and then returns to the full-line return arm. Although the configuration has been described in which the contact of any of the first lever switching arm 61a to the third lever switching arm 63a with the long side portion 241C at the center of the 240 is released and brought into a non-contact state, the present invention is not limited thereto. For example, a full-strand return operation lever (not shown) may be provided as a dedicated lever, and the full-strand return operation lever and the central long side portion 241C of the full-strand return arm 240 described above may be connected by a connecting cable. In the case of this configuration, the operator operates the all-return operation lever in a predetermined direction, and the connecting cable is pulled in conjunction with the operation. The partial clutch lever located at "" is returned to the "clutch engaged position" (see FIGS. 9A and 9B), and after the lever is operated, the operator releases his hand from the full-line return operating lever. By the restoring action of the torque spring (not shown) provided on the full-strand return operation lever, the full-strand return operation lever rotates in the direction opposite to the predetermined direction and returns to the original position, and the full-strand return arm Contact with any switching arm of the first lever switching arm 61a to the third lever switching arm 63a by the central long side portion 241C of 240 is released, and a non-contact state is established. Even in this configuration, the same effects as described above are exhibited.

  In the above embodiment, when the roller 233 gets over the boundary portion 222a (see FIG. 8) of the return cam 220 as the elevating link device 100 is raised, the return cam 220 is restored to the restoring force of the torque spring 260. By this action, the left-hand side view rotates clockwise (see arrow A in FIG. 8), and the full-arm return arm 240 rotates by its own weight with the lever support shaft 65 as the center of rotation in the left-side view. It has been described that the long side portion 241C is released from contact with the first lever switching arm 61a and is in a non-contact state (see FIG. 3). A return arm torque spring (not shown) is provided separately, and due to the restoring force of the return arm torque spring, the full return arm 240 has the lever support shaft 65 as the center of rotation. Rotates clockwise in left side view, with any of the switching arm of the first lever switch arm 61a~ third lever switch arm 63a by the long side portion 241C abutment is released, it may be configured as a non-contact state.

  Moreover, although the said embodiment demonstrated the case where all the 1st partial clutch lever 61-the 3rd partial clutch lever 63 were arrange | positioned collectively on the left side of the control seat 22, it is not restricted to this, For example, a some partial clutch The levers may be arranged separately on the left and right sides of the control seat 22 or may be arranged on the right side. Even when a plurality of partial clutch levers are arranged separately on both the left and right sides of the control seat 22, the right full-arm return arm for returning the partial clutch lever arranged on the right side and the partial clutch lever arranged on the left side are provided. A left-side full-return arm for returning, the return cam 220 and the crank arm 230 are provided one by one as in the above embodiment, and the front end of the connecting cable connected to the return cam 220 Branch the right side and left side, connect the right front end of the connecting cable to the right full return arm, and connect the left front end of the connection cable to the left full return arm. This makes it easy to configure.

  Moreover, although the said embodiment demonstrated the case where the connection cable 250 was used as an example of the connection member of this invention, a connection member is not limited to this.

  In the above-described embodiment, the six-row riding rice transplanter 1 has been described as an example of the work vehicle of the present invention. However, the present invention is not limited to this. There may be, and it is not limited to the number of articles.

  ADVANTAGE OF THE INVENTION According to this invention, the work vehicle which can relieve | moderate resistance in the switching operation by the partial clutch lever for partially stopping a predetermined work can be provided, for example, it is useful as a riding rice transplanter etc. .

DESCRIPTION OF SYMBOLS 1 Passenger rice transplanter 2 Traveling vehicle body 3 Hopper 4 Front wheel 5 Rear wheel 6 Transmission case 7 Car body main frame 10 Link support stay 50 Planting device 60 Mounting frame 61 1st partial clutch lever 62 2nd partial clutch lever 63 3rd partial clutch lever DESCRIPTION OF SYMBOLS 100 Elevating / lowering link device 200 Return device 210 Return cam support stay 220 Return cam 230 Crank arm 240 Full-row return arm 250 Connecting cable

Claims (4)

The vehicle body and (2), row and vertically movably connected by the working apparatus (50), partially whether switching operation halting the work of the working device (50) to said vehicle body (2) cormorant part minute clutch lever and (61, 62, 63),
A return device (200 ) for returning the partial clutch lever (61, 62, 63) from the rested state to a working state ;
The return device (200) is brought into contact with the partial clutch lever (61, 62, 63) in conjunction with the working device (50) being raised to a predetermined position, so that the partial clutch lever (61, 62 , after moving the 63) in the direction to the return, the return in a direction opposite to the predetermined direction, a working vehicle, wherein the benzalkonium to release the abutment. Before Kifuku return device (200) includes a first actuating member (220) mounted for rotation, contact with the association with the rise of the working device (50) the first actuating member (220) said The second actuating member (230) for rotating the first actuating member (220) in a predetermined direction and the partial clutch lever (61, 62, 63) are brought into contact with the partial clutch lever (61, 62, 63). A return arm member (240) that moves in the return direction; a connecting member (250) that connects the first actuating member (220) and the return arm member (240);
After the first actuating member (220) is rotated in the predetermined direction by the contact of the second actuating member (230), the working device (50) is further raised, so that the second actuating member ( 230) the first remote from the actuating member (220), said first actuating member (220) the work vehicle according to claim 1, wherein the rotation to Turkey in the predetermined direction and the opposite direction. Before Stories second actuating member (230) has one end rotatably attached to the elevating link member (100), can contact a is formed in the other end portion the first actuating member (220) And
When the working device (50) moves up to the predetermined position, the second operating member (230) contacts the first operating member (220), and the first operating member (220) rotates,
When the working device (50) descends from the predetermined position to the predetermined position, the second operating member (230) rotates by contacting the edge of the first operating member (220). The work vehicle according to claim 2 , wherein rotation of the first operating member (220) is suppressed . The work vehicle according to claim 2 or 3 , wherein a biasing member (260) for biasing in the direction opposite to the predetermined direction is attached to the first operating member (220) .