JP2009255915A5 - - Google Patents

Description

Riding work machine

  The present invention relates to a riding work machine such as a riding rice transplanter or a riding paddy direct sowing machine.

  In passenger rice transplanters, when the aircraft is put in and out of the field, or loaded onto a truck bed, etc., the aircraft may be greatly tilted back and forth. It is desirable to do. As means for responding to such a request, for example, as disclosed in Patent Document 1 or Patent Document 2, an auxiliary handle lever is attached to a pitman arm that steers the front wheel, and an operator standing on the ground moves in front of the aircraft. Means have been proposed for forcibly operating the pitman arm by swinging the auxiliary handle lever at the section.

JP 7-96839 A JP-A-7-96840

  According to the above proposed means, the operator can control the loading / unloading of the aircraft to / from the field and loading / unloading of the aircraft to / from the truck bed, etc., but the auxiliary handle lever is integrated with the pitman arm. Since it will turn left and right, it is necessary to make it possible to detach and attach the auxiliary handle lever so that it can be removed from the pitman arm during normal work traveling on board the aircraft.

However, in the riding rice transplanter performing paddy work, the pitman arm located under the fuselage front and of course that mud is likely to adhere, the mud adheres to the auxiliary handle lever connecting portion provided on the pitman arm There is also a problem in practical use because there is a possibility that it is difficult to attach and detach the auxiliary handle lever.

In addition, because the rice paddy machine uses the rear wheels as the main propulsion wheels, when traveling uphill, the front of the fuselage is lifted by the propulsion reaction force, and the grounding pressure of the front wheels decreases and the propulsion force by the front wheels decreases. There are things . In such a case, an operator on the ground depresses the front part of the fuselage to suppress the lift of the front part of the fuselage, but since the conventional auxiliary handle lever was connected to the pitman arm, If an operation that pushes down the front of the fuselage with the applied force is performed, the pitman arm may be deformed or damaged.

The present invention was made in view of such point, the steering operation of the aircraft from the ground can be easily carried out, also, the front wheels or the like irregularities of road surface is freely steered It is an object of the present invention to provide a riding work machine that can avoid such a situation .

  [Configuration, operation and effect of the invention according to claim 1]

(Configuration) The riding work machine of the invention according to claim 1 is configured to be switchable between a first posture retracted toward the traveling aircraft body and a second posture protruding forward of the traveling aircraft body at a front portion of the traveling aircraft body. A grip operation tool, and the steering operation of the front wheel is prevented from being restrained by a downward pressing operation of the grip operation tool when the grip operation tool is switched to the second posture. Features.

( Operation ) According to the above configuration, the traveling body is allowed to self-run at a low speed, the grip operation tool at the front of the body is switched to the second position protruding forward, and the grip operation tool is pressed from the ground to operate the front of the body. While restraining the lift, swinging the grip operation tool to the left and right and correcting the direction of the aircraft slightly, overloading the aircraft and loading / unloading the aircraft to / from the vehicle. In this case, by pushing down the grip operation tool switched to the second position, the steering operation of the front wheels is restrained, and the front wheels are caused to fall into the unevenness of the traveling road surface or to react due to riding up. It is possible to avoid being steered in an arbitrary direction with force.

(Effect) Therefore, according to the invention of claim 1, when the steering from the ground with the grip operating member to the second position, by operating push down the grip operation device downwards, traveling machine body is believed by road surface conditions There is no possibility of moving in the direction of the vehicle, and it is possible to safely and surely cross the ridge or load and unload the vehicle on the vehicle.

[Configuration, operation and effect of invention of claim 2 ]

(Configuration) The riding work machine of the invention according to claim 2 is configured such that, in the invention according to claim 1 , the steering operation of the front wheel is not restrained in a state where the front wheel is steered beyond a set angle. It is.

( Operation ) According to the above configuration, even when the gripping operation tool is switched to the second posture and pushed downward while the front wheel is largely steered , the function of inhibiting the steering operation of the front wheel is exhibited. The front wheel cannot be fixed. Accordingly, if the vehicle is driven unattended in such a state, the front wheels become unstable and the moving direction of the airframe is not stable, so that it can be easily recognized that the vehicle is not suitable for ground control. In such a case, after returning to a state close to the front wheels to the straight, again, may be Re to pressed down the grip operation device of the second position downward.

(Effects) Therefore, according to the invention according to claim 2 , it is possible to prevent the ground maneuvering from being performed by pushing down the grip operation tool in the second posture downward while the front wheel is largely steered. Effective above.

[Configuration, operation and effect of invention of claim 3 ]

(Configuration) The riding work machine of the invention according to claim 3 is the invention according to claim 1 or 2 , wherein the grip operating tool is switched between the first posture and the second posture, and in the second posture. The grip operating tool is pushed down by swinging up and down the grip operating tool, and the tilt angle of the grip operating tool that inhibits the steering operation of the front wheel can be adjusted. .

( Operation ) According to the above configuration, the grip operation tool whose posture is switched in a swinging manner is not necessarily used in the second posture having a constant lying angle, but according to the lying angle at the time of use , The timing at which the steering operation of the front wheels is restrained by the downward pressing operation of the grip operating tool can be adjusted.

(Effect) Therefore, according to the invention according to claim 3 , by using the grip operation tool in the second posture at any lying angle, by pressing down the grip operation tool in the second posture, front wheel steering operation can it to suitably restrain blocking, and excellent in handling properties.

[Configuration, operation and effect of the invention according to claim 4 ]

(Configuration) A riding work machine according to a fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the front wheel has a larger push-down operation amount in the second posture. It is configured so that the force to prevent the steering operation of the is increased.

(Action / Effect ) According to the above configuration, the greater the amount of push-down operation of the gripping operation tool in the second posture, the stronger the force to prevent the front wheel from being steered, and the front wheel is steered by the unevenness of the road surface. It is prevented from being done.

[Configuration, operation and effect of the invention according to claim 5 ]

(Configuration) A riding work machine according to a fifth aspect of the present invention is configured as in any one of the first to fourth aspects of the present invention, wherein the steering operation of the front wheel is restrained by elastic engagement. It is.

( Operation / Effect ) According to the above configuration, the front wheels can be steered by forcibly turning the steering handle. In other words, if the gripping operation tool in the second posture is pushed down to prevent the front wheel from being steered, the front wheel will not be steered due to unevenness on the road surface, but another operator will be forced to steer the steering wheel. The front wheel can be steered if you go through.

It is a whole side view of a riding rice transplanter. It is a front view of a machine body front part. It is a perspective view of a machine body front part. It is a top view of a machine body front part. It is a side view of the front part of the body which changed the operation arm to the action posture. (A) is a side view showing the base of the operating arm in the retracted posture, and (b) is a side view showing the base of the operating arm in the working posture. (A) is a top view which shows the base of the operation arm of a retracted attitude | position, (b) is a top view which shows the assembly | attachment procedure of an urging | biasing mechanism. It is a perspective view which shows the structural member of a steering check mechanism. It is a front view which shows the base of an operation arm. It is a side view which shows a belt transmission apparatus and its operation structure. (A) is a side view showing a brake in a brake released state, and (B) is a side view showing the brake in a brake state. It is a top view which shows the operation part of a main clutch and a brake. It is a front view of a brake. It is a side view of a fulcrum shaft end. It is the partially cutaway side view which looked at the lower part of the reserve seedling stand on the left side from the inner side of the body. It is the xx sectional view taken on the line in FIG. It is a cross-sectional top view which shows a front part support structure. It is a cross-sectional top view of a rear part lower part. It is a longitudinal front view of the upper part of the reserve seedling platform. It is a side view which shows an example of a ground control state. It is a side view which shows the modification of a steering control mechanism. It is a block diagram which shows another embodiment of a steering check mechanism. It is a block diagram which shows another embodiment of a steering control mechanism. It is a perspective view of the machine body front part provided with the operation arm of other embodiments.

  FIG. 1 shows a riding rice transplanter as an example of a riding work machine according to the present invention. This riding rice transplanter has a seedling planting device 5 via a hydraulically driven link mechanism 4 at the rear of a four-wheel drive type traveling machine body 3 having a steerable front wheel 1 and a rear wheel 2 as a main propulsion wheel. Are configured to be movable up and down. An engine 6 mounted on the front part of the traveling machine body 3 and a transmission case 7 supporting the front wheels 1 are linked together via a belt transmission device 8, and the gear shift and forward / reverse switching are performed in the transmission case 7. While the front wheel 1 is driven, the traveling transmission power taken out from the transmission case 7 is transmitted to the rear transmission case 9 so that the rear wheel 2 is driven at a speed synchronized with the front wheel 1. The working power taken out from the rear portion is transmitted to the seedling planting device 5 in an axial manner.

  As shown in FIG. 2 to FIG. 4, an engine bonnet 10 that houses the engine 6 is disposed at the front of the traveling machine body 3, and reserve seedling stands 11 are erected on the left and right lateral sides, In addition, a boarding / alighting passage 12 is formed between the engine bonnet 10 and the reserve seedling platform 11 for allowing walking movement between the front end of the machine body and the driving unit.

A battery-mounted front frame 13 is provided at the lower front end of the traveling machine body 3, and the front portion of the guard frame 14 provided so as to surround the left and right side portions from the front portion of the front frame 13 serves as a pipe material. The traction frame 15 is bent into a shape. An operation arm 16 for ground control is attached to the left and right outer sides of the guard frame 14 so as to swing up and down around a lateral fulcrum a. The operation arm 16 is formed by bending the round pipe material into an arch shape that expands downward and connecting the middle portion with a stay 16a to form an A shape so as not to hinder the walking movement in the getting-on / off passage 12. The upper end of the operation arm 16 is positioned at a height at which the operator seated on the driver seat 17 can visually check through the engine bonnet 10 when vertically standing. It is configured to Further, the left and right base end portions of the operation arm 16 are pivotally connected to the left and right side portions of the front frame 13 by bolts 18 so as to be able to swing up and down, and the disc spring 19 provided at one bolt connection portion is tightened. Appropriate frictional resistance is imparted to the swinging motion of the operating arm 16, so that the lifting operation can be arbitrarily performed manually and the standing posture can be frictionally held.

A stopper 20 is fixed to the left and right outer sides of the front frame 13 by welding. As shown in FIG. 6A, the base of the operation arm 16 abuts against the front end of the stopper 20 so that the operation arm 16 with upright limitation of is restricted, as shown in Figure 6 (b), by the base extensions of the operating arm 16 is brought into contact with the lower surface of the stopper 20, lodging limit is restricted to the front of the operating arm 16 It is like that. Then, the operation arm 16 standing up to the limit is in a substantially vertical retracted posture, and the operation arm 16 in the action posture lying down to the limit is in a state of being slightly raised and inclined forward.

  Further, the front end portion of the operation arm 16 is configured as a side grip portion 16b having an appropriate width enough to be able to be gripped so that the operation arm 16 in the lying down posture can be pushed down and pulled forward easily. . On the rear surface of the stay 16a of the operation arm 16, a center mascot 21 as a sighting tool indicating the center of the left and right sides of the machine body is provided so as to be rotatable up and down around a fulcrum b. A name plate 22 indicating the commercial nickname of the arm 16 and the model name of the machine is affixed.

The operation arm 16 can be manually operated to swing up and down arbitrarily. In order to assist the operation of swinging the operation arm 16 having a relatively large weight, the following erection urging mechanism 30 is provided. ing. That is, as shown in FIGS. 6 and 7, the rod 31 extends rearward from the linkage metal fitting 16 c provided near the left fulcrum of the operation arm 16, and the rod 31 is provided on the left side of the front frame 13. The fixed bracket 32 is inserted and protrudes rearward, and a coil spring 34 is mounted between the spring receiving washer 33 provided at the tip of the rod 31 and the fixed bracket 32, and the operation arm 16 sways forward from the standing posture. As it is moved, the rod 31 is pulled forward, the coil spring 34 is compressed and deformed, and the operating arm 16 is urged in the standing direction by the elastic restoring force of the coil spring 34.

  Here, in the range where the operating arm 16 is swung slightly forward from the vertical standing limit position, the frictional resistance at the fulcrum a is set larger than the standing biasing force by the coil spring 34. In this swinging range, The operation arm 16 can be held at an arbitrary standing angle. In other words, the position of the center mascot 21 can be adjusted and held back and forth within a certain range, and the center mascot 21 can be set and used at a position that is easy for the driver to see. Further, in the state where the operation arm 16 is largely tilted forward, the urging force exerted by the coil spring 34 is larger than the frictional resistance at the fulcrum a. Therefore, when the operation arm 16 is released, it automatically returns to a position where it stands up to some extent. Move.

  The rod 31 and the coil spring 34 are assembled as follows. That is, first, as shown in FIG. 7B, the spring receiving washer 33 and the coil spring 34 are attached to the rod 31 before assembly, and the coil spring 34 received by the spring receiving washer 33 is compressed using a jig or the like. At the same time, a temporary fixing pin 36 is inserted into a pin hole 35 formed in the middle of the rod 31 to prevent the compressed coil spring 34 from being restored. Next, the rod 31 on which the coil spring 34 has been compression-fitted is inserted from the side into a rod insertion hole 37 that is formed by cutting the fixing bracket 32 laterally, and the front end of the rod 31 is attached to the fulcrum a in advance. It is pivotally connected to the lower end. Next, the operating arm 16 is largely tilted forward around the fulcrum a, and the rod 31 is pulled forward to the position shown in FIG. Accordingly, the temporary fixing pin 36 that has received the front end of the coil spring 34 that has been compressed in advance passes through the rod insertion hole 37 of the fixing bracket 32 forward. At this time, the coil spring 34 is received by the fixed bracket 32 and further compressed and deformed, whereas the temporary fixing pin 36 is detached from the coil spring 34 and exposed to the front of the fixed bracket 32, and the reaction force of the coil spring 34. The temporary fixing pin 36 that is in a free state that is not subjected to receiving can be easily pulled out from the rod 31, whereby the assembly of the rod 31 and the coil spring 34 is completed.

Further, near the base of the operation arm 16, a steering check mechanism 40 that restricts and controls the steering of the front wheel 1 when the operation arm 16 is tilted forward is configured and deployed as follows. That is, as shown in FIGS. 6 and 7, the steering check member 42 is attached to the bracket 41 fixed to the front end portion of the mission case 7 so as to be rotatable around the lateral axis c via the support shaft 43. In addition, a projection 45 is provided on the upper surface of the front wheel steering pitman arm 44 mounted on the transmission case 7 to engage the steering check member 42. Further, an upper extension end 46 a of a torsion spring 46 that is externally fitted to the support shaft 43 is wound around the rear end portion of the rod 31 and supported by the pin 47 to prevent the torsion spring 46 from coming off. The lower extension end 46b is engaged and connected to the steering check member 42, and the upper extension end 46a of the torsion spring 46 is pushed and moved forward in accordance with the forward movement of the rod 31. The entire torsion spring 46 rotates around the support shaft 43 and the lower extension end 46b moves rearward. Therefore, the steering check member 42 locked to the lower extension end 46b is moved around the axis c. The engaging action portion 42 a provided at the lower end of the steering restraining member 42 is elastically engaged with the protrusion 45 of the pitman arm 44 from the front, and the front of the rod 31 is rotated. As the amount of movement increases, the amount of torsional deformation of the torsion spring 46 increases. Is, the engaging pressing action on the projection 45 of the engaging action for section 42a is day become stronger.

  As shown in FIG. 7 (a), the protrusion 45 is formed in a mountain shape toward the front, and the engaging action portion 42a of the steering check member 42 is formed in a V shape opened rearward. Even if the pitman arm 44 is steered slightly to the left and right from the rectilinear position, the pitman arm 44 is corrected to the rectilinear position by pressing the V-shaped engaging portion 42a to the mountain-shaped protrusion 45. And is stably engaged and held at that position. Therefore, when the operation arm 16 is largely tilted forward, the pitman arm 44 is stably held at the straight traveling position, and the front wheel 1 is prevented from being steered by the unevenness of the road surface.

  However, since the engaging action part 42a of the steering check member 42 is elastically engaged with the protrusion 45 of the pitman arm 44, if the steering handle 23 of the driving part is forcibly rotated, the protrusion 45 is operated. The pitman arm 44 can be steered so as to move over the engaging action portion 42a while pushing the direction check member 42 forward against the torsion spring 46. In other words, when the operating arm 16 is operated to fall down and the steering check mechanism 40 is in an activated state, the front wheel 1 is not steered by the unevenness of the road surface, but another operator can forcibly remove the steering handle 23. For example, the front wheel 1 can be steered.

In addition, the mounting position of the pin 47 mounted to receive the upper extending end 46a of the torsion spring 46 at the tip of the rod 31 that links the operation arm 16 and the steering check mechanism 40 can be changed. and which can be by changing the mounting position, adjusting the lodging angle of the operating arm 16 when the steering check mechanism 40 starts to check operation.

  As shown in FIG. 10, the belt transmission 8 includes two sets of output pulleys 51a and 51b and input pulleys 52a and 52b having different transmission ratios on the output shaft 6a of the engine 6 and the input shaft 7a of the transmission case 7, respectively. The belts 53a and 53b are wound around the belt 53a and the tension rollers 54a and 54b acting on the belts 53a and 53b are selectively actuated to perform two shifts of “high” and “low”. A so-called double-tension type speed change function is provided, and tension arms 55a and 55b including the respective tension rollers 54a and 54b are connected to the sub-speed change lever 24 provided on the left side of the driver's seat 17 with two sets of link mechanisms. They are linked via 56a and 56b. Note that the main gear transmission in the transmission case 7 is operated in three stages to change to “high speed” for moving traveling, “low speed” for planting traveling, and “super” for overloading and unloading on vehicles. A main speed change lever 25 for selecting “low speed” is installed on the center front portion of the driving unit step 26 so as to be capable of lateral movement, and performs a gear shift in the transmission case 7 by swinging back and forth to move forward and backward. A shuttle lever 27 is provided on the left side of the steering handle 23.

  Here, the two sets of tension rollers 54 a and 54 b that perform two-stage shifting are configured to function also as the main clutch 57. That is, the contact arm 59 is provided on the pedal arm 58a of the main clutch pedal 58 disposed on the left front of the operation unit step 26, and the base end extensions of the tension arms 55a and 55b in the belt transmission 8 are provided. Opposed to the contact portion 59, and by depressing the main clutch pedal 58, both tension arms 55a and 55b are operated to the “clutch disengagement” side, and transmission from the engine 6 to the transmission case 7 A so-called tension clutch type main clutch 57 is configured. Also, a brake 60 that brakes the input shaft 7a of the transmission case 7 and stops the machine body is provided below the transmission of the main clutch 57.

As shown in FIGS. 11 and 12, a stop lever 62 for simultaneously operating the main clutch 57 and the brake 60, and a brake arm 63 are loosely mounted on a fulcrum shaft 61 that loosely supports the pedal arm 58a. The pedal arm 58a and the stop lever 62 are urged to return upward by torsion springs 64 and 65, respectively, while being fitted and supported and extended forward. A washer 66 for preventing the pedal arm 58a, the stop lever 62, and the brake arm 63 from coming off is attached to the tip of the fulcrum shaft 61 via a bolt 67. As shown in FIG. The extended end of the gear 66 is non-rotatably engaged with the lateral frame 68 constituting the fuselage frame, and a part of the washer 66 is bent so as to engage with the head flat surface of the bolt 67. The detent is made.

The stop lever 62 is arranged so as to cross the pedal arm 58a from above. When the stop lever 62 is swung downward, the pedal arm 58a is pushed down by the one-sided contact of the stop lever 62 from above and is mainly operated. When the clutch 57 is disengaged and the main clutch pedal 58 is depressed, the stop lever 62 is left at the return position. The stop lever 62 is provided close to the left side surface of the engine bonnet 10 so as not to obstruct walking movement in the getting-on / off passage 12. Here, the left and right side surfaces of the engine bonnet 10 are formed in curved surfaces that are outwardly three-dimensionally curved, and the stop lever 62 is extended further forward than the convex top of the bonnet side surface. Even if the lever main body is arranged close to the bonnet side surface, the lever grip portion 62b can be arranged away from the bonnet side surface so as to be easily operated.

Further, wherein the distal end of the brake arm 63, the input pulley 52a in the belt transmission device 8, together with the brake pads 70 acting provided in the belt winding grooves of the input pulley 52a of the outer of the 52 b, the stop lever 62 And the brake arm 63 are interlocked with each other via a rod 72 fitted with a compression coil spring 71, and the brake arm 63 is also operated downward as the main clutch 57 is disengaged by depressing the stop lever 62. Thus, the brake 60 is configured so that the input pulley 52a is braked. Here, when the stop lever 62 is pushed down, the operation timing of the main clutch 57 and the brake 60 is set so that the brake 60 starts to work before the main clutch 57 is completely disengaged.

As shown in FIG. 13, even at the brake release position where the brake arm 63 has returned, the brake pad 70 is slightly engaged in the groove of the input pulley 52a, and even if the brake arm 63 moves slightly laterally. When the brake is applied, the brake pad 70 is correctly press-fitted into the groove of the input pulley 52a. Further, by adjusting the mounting position of the pin 73 provided at the lower end of the rod 72, the reference position of the brake arm 63 at the brake release position can be adjusted, and the timing at which the brake 60 starts to work can be adjusted. Further, by adjusting the position of the spring receiving pin 74 attached to the upper portion of the rod 72, the initial compression state of the compression coil spring 71 can be adjusted, whereby the brake pad 70 is applied to the input pulley 52a when the brake is operated. The pressing force can be adjusted.

As shown in FIGS. 11 and 12, a locking lever 75 that engages with a hanging bracket 58b of the main clutch pedal 58 that has been depressed is swingable back and forth around a fulcrum d and forward in the left passageway 12. The main clutch pedal 58 that has been deployed and depressed in return is locked and held by a locking lever 75 so that the main clutch disengaged state can be held.

A locking pin 76 with a head is provided on the side surface of the locking lever 75 on the stop lever 62 side. The head locking pin 76 is off the swing operation path of the stop lever 62, but as shown by the phantom line in FIGS. 11 (b) and 12, the stop position (main clutch disengagement and The stop lever 62 oscillated until the brake operation state) is forcibly elastically deformed to the locking lever 75 side as it is and locked to the locking pin 76 with the head from below, so that the stop lever 62 is brought into the stop position. It is possible to keep it.

Further, the upper exposed portion of the stop lever 62 is provided with a stepped portion 62a that overlaps from the rear at the right end portion of the main clutch pedal 58. When the stop portion 62a of the stop lever 62 held and held at the stop position by the stop pin 76 is stepped on and the stop lever 62 is further swung downward, the stop lever 62 released from the headed stop pin 76 is moved. When the stepping part 62a is released in this state, the stop lever 62 returns to the initial position (main clutch engaged and brake released state) without interfering with the head locking pin 76. As a result, the main clutch pedal 58 also returns to the clutch engaged position.

A reserve seedling base 11 provided outside the boarding passage 12 next to the engine bonnet 10 is provided with an arch-shaped support 80 that is erected on a support base 81 fixed on the machine body side. The seedling support plate 82 is mounted in an outward cantilevered manner, and the entire preliminary seedling support base 11 is about 180 degrees behind the vertical axis e on the rear support 80b side of the support 80. Can be stored in a state where the seedling plate 82 is prevented from projecting laterally outward from the machine body, and when the machine body is loaded on a vehicle or stored in a garage. It has become a convenient thing. In particular, when the left-side reserve seedling platform 11 is pivoted and retracted rearward, the periphery of the stop lever 62 is wide and the lever operation is facilitated when operating the ground using the operation arm 16 as described above.

The support 80 of the reserve seedling table 11 has a vertical axis e, which is the axis of rotation, set vertically, but in a normal use posture, it has a small angle (for example, several degrees). If the entire reserve seedling bed 11 is tilted about 180 degrees backward about the longitudinal axis e of the rear column 80b, the column 80 will be inclined to the outside of the vehicle. As a result, it is avoided that the seedling plate 82 of the preliminary seedling base 11 that has been rotated rearwardly enters the inside of the machine body and interferes with the shuttle lever 27 and the like.

  On the seedling plate 82 of the preliminary seedling table 11, the mat-like seedlings placed on and supported by the seedling scooping plate 83 are placed and accommodated. The seedling scooping plate 83 is configured to be stored on the uppermost seedling setting plate 82. That is, on the upper part of the support 80, a presser bar 84 bent in an arch shape is inserted and installed around the fulcrum f so as to be able to rotate up and down around the supporter f, and between the presser bar 84 and the rear support 80b. As shown in FIG. 19, a toggle spring 85 is mounted over the dead point DP so as to be able to switch and hold between a non-acting posture in which the presser bar 84 is swung upward and an acting posture that rests on the seedling plate 82. Has been. Accordingly, when the reserve seedlings are fully loaded, the presser bar 84 is switched and held in the non-acting posture in which the presser bar 84 is swung upward. When the seedlings are replenished and the uppermost seedling resting plate 82 is free, this seedling resting plate is used. The used seedling scooping plate 83 is placed on 82, and as shown by the phantom line in FIG. 19, the seedling scooping plate 83 is elastically pressed and clamped by the presser bar 84 switched to the action posture. The seedling scoop plate 83 is collected and stored so as not to be blown away by wind or the like.

  As shown in FIG. 15, the rear strut 80 b of the preliminary seedling raising base 11 is externally fitted to a rear support shaft 86 that is erected and fixed to the support base 81 so as to be rotatable around the longitudinal axis e. And the lower end of the front support column 80a is connected to the upper end of the front support shaft 88 that is erected and fixed to the support base 81 so as to face each other. That is, as shown in FIGS. 16 and 17, the lower end of the front column 80a is provided with a U-shaped positioning bracket 89 that projects downward toward the inner side of the machine body. By fitting 89 to the front support shaft 88 from the lateral outer side, the front support shaft 88 and the front support column 80a are positioned concentrically and abutted vertically.

  In addition, a horizontal support shaft 90 is pierced through the lower portion of the front column 80a so as to be slidable laterally. A hanging metal fitting 91 is loosely mounted on the projecting end of the support shaft 90 inside the machine body, and The hook 91 is urged together with the support shaft 90 toward the front support shaft 88 by a spring 92 that is externally fitted. A lever 93 is connected to the hook 91, and a positioning bracket 89 is fitted to the front support shaft 88 from the lateral outer side so that the front support shaft 88 and the front support column 80a are positioned concentrically. Then, the lever 93 is pivoted upward around the support shaft 90 in a state of being vertically butted so that the hook 91 is locked to the back portion of the front support shaft 88, and the front column 80a is moved to the front support shaft. It is prevented from leaving laterally outward from 88. A locking groove 94 is formed in an annular shape on the outer peripheral surface of the front support shaft 88, and a locking pin 95 projects from the inner surface of the positioning fitting 89, so that the front support column 80a is supported by the front support shaft. In the state of being butt-connected to the shaft 88, the locking pin 95 is engaged with the locking groove 94, so that the front column 80 a does not come off upward with respect to the front support shaft 88.

Further, the lever 93 can be swung forward to remove the hook 91 from the front support shaft 88 so that the entire reserve seedling base 11 can be rotated rearward around the rear vertical axis e. it can.

It should be noted that the rear support shaft 86 is equipped with a seedling marker 100 that is used when the machine body is driven by tracing the seedling row planted previously. The seedlings marker 100 is configured to swingably connected marker arm 102 around the fulcrum g portrait to a bracket 101 fixed to the rear shaft 86, the marker rod 103 attached to the distal end of the marker arm 102, The rubber cap 104 is vertically penetrated, and the marker rod 103 can be slid to an arbitrary height and held by the frictional resistance of the penetrating portion with the rubber cap 104. Yes.

As shown in FIG. 18, the bracket 101 is provided with a locking member 105 made of a spring plate material in a cantilever shape, and when the reserve seedling table 11 is rotated about 180 degrees rearward, the rear column 80b. A vertical pin 106 that is fixed near the lower end of the spring is elastically engaged with the locking metal fitting 105 so that the reserve seedling base 11 is held in a rearward rotation state.

  The riding rice transplanter according to the present invention is configured as described above, and during normal work travel where an operator gets on the driver's seat 17 and operates, as shown in FIGS. The center mascot 21 is kept standing while being switched to the standing posture. In this case, even if the main clutch pedal 58 is depressed and the main clutch 57 is disengaged, the stop lever 62 remains, so that the brake 60 is not braked.

When the traveling machine body 3 tilts back and forth, such as when moving over the ridges for loading / unloading the passenger rice transplanter into / from the field, or when loading / unloading the passenger rice transplanter onto a loading platform such as a truck, with selecting main shift lever 25 to "very slow", select the sub transmission lever 24 to the "slow", and set appropriately high engine output by the accelerator operation, and ready for slow-speed travel in high-torque running The operator descends to the ground and steers while the body 3 is self-propelled. In this case, the front wheel 1 is in a straight traveling state and the operation arm 16 is switched to the action posture that protrudes greatly forward.

For example, as shown in FIG. 20, when the vehicle moves forward with an upward slope, the front part of the traveling machine body 3 may be lifted by the propulsion reaction force. In such a case, the operation arm 16 is pushed down. By applying a downward load to the front part of the aircraft, it is possible to suppress the lift of the front part of the aircraft. When the road surface is bad and it is difficult to climb, it is possible to assist the climbing by pulling the operation arm 16 forward. Further, the direction of the aircraft can be forcibly corrected by pushing and pulling the operation arm 16 left and right as necessary. In such an operation, the front wheel 1 is stably held in the straight traveling direction by the steering check mechanism 40, and the front wheel 1 is steered by the unevenness of the road surface and the aircraft moves in an unexpected direction. Absent.

  Further, in order to stop the aircraft during maneuvering from the ground, if the stop lever 62 is pushed down, the main clutch 57 is disengaged, the brake 60 is braked, and the aircraft immediately stops. In this case, since the brake 60 works first, only the main clutch 57 is cut first, and the freed body does not slide down.

Then, when it is desired to maintain the airframe stop state, the stop lever 62 at the stop position may be slightly shifted to the side as it is and held by the locking pin 76 with the head of the locking lever 75. Further, the release from the stop position of the stop lever 62, either manually disengage from the headed locking pin 76, it may be returned to once depressing the tread addition unit 62a from the driver seat 17.

[Other Embodiments]
The present invention can also be implemented in the following forms.

(1) As shown in FIG. 21, a nut 108 with a washer that receives the upwardly extending end 46a of the torsion spring 46 is attached to the tip of the rod 31 that links the operating arm 16 and the steering check mechanism 40. Thus, by adjusting the position of the nut 108, the tilt angle of the operation arm 16 when the steering check mechanism 40 starts the check operation can be adjusted steplessly. Further, if the nut 108 is largely shifted backward, it is possible to bring about a state in which the steering check mechanism 40 does not function even if the operating arm 16 is swung over to the limit.

(2) As shown in FIG. 22, the stopper 109 that prevents the steering check member 42 from swinging from the retracted position to the check making position can be moved in and out of the paper surface by an actuator 110 such as a solenoid. In addition, the actuator 110 may be connected to the control device 111, and the stopper 109 may be controlled to be moved in and out as follows according to the working conditions. That is, the control device 111 determines whether or not the main transmission sensor S1 that detects whether or not the main transmission lever 25 is in the “ultra-low speed” position, and whether or not the auxiliary transmission lever 24 is in the “low speed” position. It is determined whether or not the auxiliary transmission sensor S2 to be detected and the planting lever 112 which is arranged on the right side of the driver's seat 17 and controls the raising and lowering of the seedling planting device 5 and the transmission of power to the seedling planting device 5 are in the “planting” position. A planting sensor S3 to detect, a seat sensor S4 to detect seating on the driver's seat 17, and a spare seedling platform sensor S5 to detect whether or not the left standby seedling platform 11 is rotated backward are connected. The main transmission lever 25 is in the “ultra-low speed” position, the auxiliary transmission lever 24 is in the “low speed” position, the planting lever 112 is not in the “planting” position, and the operator is seated on the driver seat 17. And the reserve seedling table 11 is When it is recognized that the vehicle is being rotated backward, that is, the conditions suitable for overpassing and loading and unloading are satisfied, the stopper 109 is controlled to move backward, and the steering check member 42 is swung. This enables the steering check mechanism 40 to function.

  In addition, since the above condition is not satisfied in a normal planting operation state or a traveling traveling state on a road, even if the stopper 109 is controlled to project and the operating arm 16 is laid down to the acting posture, only the torsion spring 46 is used. Is torsionally deformed and the swinging operation of the steering restraining member 42 is prevented from coming into contact, thereby bringing about a state where the steering restraining mechanism 40 does not function.

  Further, the control device 111 is connected with a check release switch SW for releasing the steering check function of the steering check mechanism 40 by projecting the stopper 109 so that the operation arm 16 is switched to the operating posture. In addition, it is possible to arbitrarily present a check release state in which the steering check mechanism 40 is not operated.

(3) As shown in FIG. 23, a stopper 113 that prevents the operation arm 16 from swinging from the standing posture to the working posture is provided so as to be able to move out and withdrawn by an actuator 114 such as a solenoid. May be connected to the control device 111, and the stopper 113 may be controlled to be withdrawn / removed as follows according to work conditions. That is, as in the previous example, the control device 111 is connected to the main transmission sensor S1, the auxiliary transmission sensor S2, the planting sensor S3, the seat sensor S4, and the spare seedling platform sensor S5. In the “low speed” position, the auxiliary transmission lever 24 is in the “low speed” position, the planting lever 112 is not in the “planting” position, the operator is not seated on the driver seat 17, and the spare seedling platform 11 Is moved backward, that is, when it is recognized that the conditions suitable for overpassing and loading and unloading the vehicle are satisfied, the stopper 113 is controlled to be retracted and the operating posture of the operating arm 16 is A state in which the switching swing to is allowed is brought about. Further, since the above condition is not satisfied in the normal planting work state or the traveling traveling state on the road, the stopper 113 is controlled to be protruded, and the operation arm 16 cannot be laid down in the acting posture.

  Further, when the operating arm 16 is tilted to the action posture in a state where the above conditions are satisfied, this is detected by a tilting sensor S6 composed of a potentiometer, and is detected in each of the operating path of the main transmission lever 25 and the operating path of the auxiliary transmission lever 24. The provided stoppers 115 and 116 are controlled to be protruded by actuators 117 and 118 such as solenoids to prevent the main transmission lever 25 from shifting from the “ultra low speed” position to the speed increasing side (transition to the neutral position is possible) ), The auxiliary transmission lever 24 is configured to prevent the shift from the “low speed” position to the high speed side, the operation arm 16 is laid down to the working posture, and the maneuvering from the ground is carried over the rod or loaded onto the vehicle. It may be possible to prevent the traveling shift from being switched from an extremely low speed state to a high speed side inadvertently.

(4) As a means for releasing the operation of the steering check mechanism 40, in addition to the means for blocking the operation of the steering check member 42 as described above, the protrusion 45 provided on the pitman arm 44 is an actuator. It is also possible to leave.

(5) As the operating arm 16 is not limited to what has been equipped as to be raised and lowered swing body front end, for example, as shown in FIG. 24, the lower left and right passenger passage 12, longitudinal It is also possible to implement by implementing a U-shape that is slidably mounted on and off. In this case, the front end of the retracted operating arm 16 in the retracted posture can be used as a protector for the front end of the machine body.

(6) The steering check mechanism 40 that operates when the operating arm 16 is switched to the operating posture is configured to stably hold the front wheel 1 in the straight traveling state, and at the time when the operating arm 16 is switched to the operating posture. The front wheel posture may be fixed or braked.

(7) The steering check mechanism 40 may be configured such that the posture of the front wheel 1 when the operation arm 16 is switched to the working posture is engaged, fixed, elastically held, or frictionally held.

(8) The steering check mechanism 40 may be configured to engage and lock the steering handle shaft in addition to acting on the pitman arm 44.

1 front wheel 3 traveling machine body 16 grip operating tool