JP2008260533A5 - - Google Patents

Description

Riding paddy field machine

  The present invention relates to a riding paddy field work machine such as a riding rice transplanter or a riding paddy direct seeding 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 rice transplanter that performs paddy field work, naturally mud tends to adhere to the pitman arm located at the lower part of the front part of the machine body, and if mud adheres to the auxiliary handle lever connecting part provided in this pitman arm, There was a possibility that it would be difficult to detach the auxiliary handle lever, and there was a problem in practical use.

  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. In such a case, it is desirable that an operator on the ground depresses the front part of the fuselage to suppress the lift of the front part of the fuselage, but the conventional auxiliary handle lever is connected to the pitman arm. For this reason, if an operation that pushes down the front of the fuselage with the force applied to the auxiliary handle lever is performed, the pitman arm may be deformed or damaged.

The present invention has been made paying attention to such points, and can easily control the aircraft from the ground, and restrains the front wheels from being steered by the unevenness of the road surface. an object of the present invention is to provide a ride-working machine that can be prevented.

  The configuration, operation, and effect of the invention according to claim 1 are as follows.

(Structure) The riding paddy field machine according to the first aspect of the present invention projects a ground control operating arm equipped at the front part of the traveling machine body to a retracted posture retracted toward the traveling machine body and forward of the traveling machine body. posture changeable so constructed into a front projecting position, front wheels of the operating arm in a state that is substantially straight orientation and correct changing posture forwardly projecting orientation front wheels in the straight position to restrain retain its straight posture Misao It is characterized by having a direction check mechanism .

(Operation) According to the above-described configuration, the operating arm is retracted to the retracted posture so as not to obstruct the operator when working on the field, traveling on the road, or not working. In addition, when overpassing or loading / unloading the aircraft to / from the vehicle, the traveling aircraft is allowed to self-propel at low speed, and the operation arm at the front of the aircraft is switched to a forward projecting posture that projects forward, so that the operation arm is To suppress the lift of the front part of the machine body, pull the operation arm forward to assist propulsion, or swing the operation arm left and right to make some aircraft direction corrections.

In addition, when the rear wheel falls into a recess in the field or on the ground, or the rear wheel hits a projection on the ground and it becomes difficult to move over, the weight of the operation arm that protrudes forward is projected. Applying a strong push-down operation, such as by hanging, gives the passenger aircraft a rotational moment in the front-down direction centered on the front wheels, lifts the rear of the fuselage, and makes the rear wheels get over recesses and protrusions. be able to.

In addition, it is equipped with a steering check mechanism that corrects the front wheel to a straight running posture when the operating arm is changed to a forward projecting posture and checks the straight running posture. It can prevent restraint.

(Effect) Therefore, according to the invention according to claim 1, by operating the operating arm of the forward projection attitude which projects forwardly, Ru can be performed aircraft maneuvers from the ground readily.

  The configuration, operation, and effect of the invention according to claim 2 are as follows.

(Configuration) The riding paddy field work machine of the invention according to claim 2 is provided in the invention of claim 1, wherein the operation arm is arranged to swing up and down at a location in front of the engine bonnet arranged at the front of the machine body, The base of the operating arm is configured to be wide and pivotally connected to the front of the aircraft, and the lateral width of the operating arm is set to a size that fits within the lateral width of the engine bonnet, and a boarding passage is provided laterally outside the engine bonnet. It is provided .

(Operation) According to the above configuration, it is possible to have a larger width supporting the base of the operating arm to the fuselage. The operation arm wide which is erected stored at a location on the front side of the engine hood, things like projects laterally outwardly from the engine hood is rather name, wide operating arm which is erected stored, engine bonnet next passenger passage Does not protrude.

(Effect) Therefore, according to the invention according to claim 2, the base of the operation arm can be widely and firmly supported on the airframe, and the operation load applied by the operation arm can be transmitted to the reliable traveling aircraft to control the ground. Thus, the above-mentioned effect of the invention of claim 1 can be exhibited accurately. In addition, since the operation arm stood and stored does not protrude laterally from the engine bonnet, it is possible to avoid interfering with other device parts and function units arranged near the engine bonnet. In addition, when going back and forth between the kite and the driving section through the boarding passage next to the engine bonnet, the wide operation arm does not get in the way, and it is possible to easily get on and off from the kite, and the above effect Is more prominent.

  The configuration, operation, and effect of the invention according to claim 3 are as follows.

(Structure) The riding paddy field machine of the invention according to claim 3 is the invention according to claim 1 or 2 , wherein the operation arm is arranged to swing up and down at a position in front of the engine bonnet arranged at the front of the machine body. In addition, the height of the tip of the operation arm stowed and stored is set to be substantially equal to the height of the engine bonnet.

( Operation ) According to the above configuration, it can be seen whether or not the operating arm is correctly stored over the engine bonnet even if the driver who has boarded and seated does not consciously monitor when performing normal boarding travel. Can be judged. In addition, the height of the operating arm stowed and stored is substantially the same as the height of the engine bonnet, and does not hinder the forward view.

(Effect) Therefore, according to the invention according to claim 3, after using the operation arm in overpass or lowering the vehicle body, forgetting to store the operation arm and moving to traveling or working on the field Even so, it is effective in avoiding an accident in which a driver who has boarded can accurately recognize that he / she has forgotten to store the vehicle, and accidentally hit the protruding operation arm against another object. Moreover, boarding operation can be performed lightly without disturbing the forward view with the operation arm stood and stored.

  The configuration, operation, and effect of the invention according to claim 4 are as follows.

(Structure) The riding paddy field machine of the invention according to claim 4 is the invention according to any one of claims 1 to 3 , wherein the operating arm is undulated at a position in front of an engine bonnet provided at the front of the machine body. Friction resistance providing means for providing a friction resistance to the undulating rotation of the operation arm is provided at the proximal end pivotal support portion of the operation arm.

( Operation ) According to the above configuration, the retracted posture of the operating arm can be frictionally held within a certain range.

(Effect) Therefore, according to the invention which concerns on Claim 4, the handleability of an operation arm improves and it becomes a user-friendly thing.

  The configuration, operation, and effect of the invention according to claim 5 are as follows.

(Configuration) A riding paddy field machine according to a fifth aspect of the present invention is the invention according to the fourth aspect , further comprising urging means for urging and urging the operation arm, and in the vicinity of the retracted posture of the operation arm , the friction The friction resistance of the resistance applying means overcomes the urging force of the urging means to frictionally hold the operation arm in the standing state.

(Operation) According to the above configuration, when the operating arm is raised and swung from the forward projecting posture protruding forward to the retracted posture, the urging means assists the standing up, so that the operating arm is heavy in order to increase the strength. Even if it is a thing, the standing storage operation can be performed easily.

(Effect) Therefore, according to the invention which concerns on Claim 5, the handleability of an operation arm improves and it becomes a user-friendly thing.

The configuration, operation, and effect of the invention according to claim 6 are as follows.

(Structure) The riding paddy field working machine of the invention according to claim 6 is the invention of claim 4 or 5, wherein a center mascot for aiming is attached to the distal end side of the operation arm.
(Operation) According to the above configuration, the center mascot equipped on the operation arm can be adjusted within the stowed storage range of the operation arm, and the front and rear positions of the center mascot can be adjusted and set so that the driver can easily see. By running the traveling aircraft so that the center mascot located at the center of the aircraft is aligned with the traveling reference line formed in the field scene, this work route can be made to follow the previous work process, or By traveling with the center mascot in alignment with the target in the above, the traveling machine body can travel straight ahead.
(Effects) Therefore, according to the invention of claim 6, the handleability of the operation arm is improved and it is easy to use, and the front and rear positions of the center mascot are utilized using the holding structure in the retracted posture of the operation arm. Adjustment is also possible, and it becomes more excellent in functionality and can be used conveniently.

The configuration, operation, and effect of the invention according to claim 7 are as follows.
(Configuration) A riding paddy field working machine according to a seventh aspect of the present invention is the invention according to any one of the first to sixth aspects, in which a stop lever extending forward is disposed on the traveling machine body. The length of the stop lever is set so that the operator who holds the tip of the operation arm can operate the stop lever in the forward projecting posture in which the operation arm projects most forward.

(Operation) According to the above configuration, when the aircraft must be stopped when the operation arm is in the forward projecting posture and the aircraft is stopped, the operation arm is changed by holding the operation arm with one hand. In such a state, the stop lever can be operated with the other hand.

(Effect) Therefore, according to the invention according to claim 7 , the aircraft can be stopped immediately without releasing the operation arm, and the operation arm is used to go over the ridge or to load and unload the vehicle. It is possible to quickly and surely perform an emergency stop of the aircraft at the time, and it becomes easy to handle.

  FIG. 1 shows a riding rice transplanter as an example of a riding paddy working 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 that is used when going back and forth between the basket and the driving unit without getting off the field.

  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 a round pipe material into a downwardly expanding arch shape and connecting an intermediate portion thereof with a reinforcing stay 16a into a highly rigid A-shape. It is configured to fit within the width of the engine bonnet 10 so as not to hinder the walking movement, and the upper end of the operating arm 16 is visually observed through the engine bonnet 10 when the operator arm 16 is seated on the driver's seat 17 when standing upright. To confirm, it is set to the same or slightly higher than the hood height. 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 14 by bolts 18 so as to be able to swing up and down, and the disc spring 19 provided at one bolt connecting 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 14 by welding, and the base of the operation arm 16 comes into contact with the front end of the stopper 20 as shown in FIG. 6 is restricted, and as shown in FIG. 6 (b), the base extension of the operation arm 18 contacts the lower surface of the stopper 20, so that the fall limit is restricted to the front of the operation 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 lateral 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. . Further, a center mascot 21 as a sighting tool indicating the center of the left and right sides of the airframe is provided on the rear surface of the stay 16a in the operation arm 16 so as to be able to swing up and down around the fulcrum b. A name plate 22 indicating the commercial nickname of the arm 16 and the model name of the machine is affixed.

  Then, as shown in FIG. 5, the distance L1 between the front end of the operating arm 16 and the axis of the front wheel 1 in the acting posture that has been lowered to the limit is the distance between the axes of the front wheel 1 and the rear wheel 2 (wheel The length L3 of the operation arm 16 itself is set to be smaller than the distance L2 between the axial centers of the front wheel 1 and the rear wheel 2. By adopting such a dimension setting, the tip of the operation arm 16 in the acting posture is pushed down to increase the ground load of the front wheel 1 or the operation arm 16 is pushed down more strongly to lift the rear wheel 2 up. Can be used.

  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 14. 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 θ in which the operating arm 16 is swung slightly forward from the vertical standing limit position, the frictional resistance at the fulcrum a is set to be larger than the standing biasing force by the coil spring 34. At θ, 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. 6A, 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, a steering check mechanism 40 that restricts and controls the steering of the front wheel 1 when the operating arm 16 is tilted forward is provided and configured near the base of the operating arm 16 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 extending end 46b is locked and connected to the steering check member 42, and the upper extending end 46a of the torsion spring 34 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 downward extending end 46b moves rearward, so that the steering check member 42 locked to the downward extending end 46b is moved around the axis c. Rotating counterclockwise in the figure, the engaging action part 42 a provided at the lower end of the steering check member 42 elastically engages with the projection 45 of the pitman arm 44 from the front, and the rod 31 moves forward. As the amount increases, the torsional deformation amount of the torsion spring 46 increases. I, engaging the pressing action of the projection 45 of the engaging action for the portion 42a is day become stronger.

Then, as shown in FIG. 7 , the projection 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 arm 44 is steered slightly to the left and right from the straight travel position, the pitman arm 44 is corrected to the straight travel position by pressing and engaging the V-shaped engaging portion 42 a with the mountain-shaped protrusion 45. Are stably held. 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.

  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 fulcrum shaft 61 that loosely supports the main clutch pedal arm 58a is provided with a stop lever 62 for simultaneously operating the main clutch 57 and the brake 60, and a brake arm 63, respectively. The main clutch pedal arm 58a and the stop lever 62 are urged to return upward by torsion springs 64 and 65, respectively. Note that a washer 66 for securing the main clutch pedal arm 58a, the stop lever 62, and the brake arm 63 through bolts 67 is attached to the tip of the fulcrum shaft 61, as shown in FIG. The extension end of the washer 66 is non-rotatably engaged with the horizontal frame 68 constituting the body frame, and a part of the washer 66 is bent so as to engage with the head flat surface of the bolt 67, The bolt 67 is prevented from rotating.

  The stop lever 62 is arranged so as to intersect the main clutch pedal arm 58a from above, and when the stop lever 62 is swung downward, the main clutch pedal arm 58a is pushed down by one contact of the stop lever 62 from above. When operated, the main clutch 57 is disengaged and the main clutch pedal 58 is depressed, so that the stop lever 62 is left in 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 62a can be arranged away from the bonnet side surface so as to be easily operated.

  A brake pad 70 is provided at the tip of the brake arm 63 and acts on a belt winding groove of the outer input pulley 52a of the input pulleys 52a and 52b in the belt transmission device 8 and a 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 friction braking is applied to the driven pulley 52a. 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 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.

  Further, as shown in FIGS. 11 and 12, a locking lever 75 that engages with the hanging bracket 58b of the depressed main clutch pedal 58 is swingable back and forth around the fulcrum d in the left and right passage 12. The main clutch pedal 58 that has been deployed and pushed forward is locked and held by the 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 is activated is forcibly deformed to the locking lever 75 side as it is and is locked to the locking pin 76 with the head from below, so that the stop lever 54 is brought into the stop position. It is possible to keep it.

  Further, a stepped portion 62a that overlaps from the rear is attached to the right end portion of the main clutch pedal 58 in the upper exposed portion of the stop lever 62. 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 plate 82 is mounted in an outward cantilevered manner, and the entire preliminary seedling bed 11 is about 180 degrees behind the vertical axis e on the rear column 80b side of the column 80. By rotating, it is possible to store the reserve seedling table 11 in a state where the overhanging of the seedling plate 82 to the lateral side of the machine body is avoided, and when the machine body is loaded on the vehicle or stored in the garage It is convenient. In particular, when the left-side reserve seedling base 13 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 stand 11 is rotated about 180 degrees about the longitudinal axis e of the rear column 80b, the column 80 is inclined outward. As a result, it is avoided that the seedling plate 82 of the preliminary seedling base 13 rotated rearwardly enters the inside of the machine body and interferes with the shuttle lever 27 and the like.

  In the seedling plate 82 of the preliminary seedling table 11, mat-like seedlings placed on and supported by the seedling scooping plate 83 are placed and accommodated. The seedling scoop plate 83 is configured to be stored on the top 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. 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 fitted to the projecting end of the support shaft 90 on the inner side of the machine body. 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.

  In addition, the lever 93 is swung forward to remove the hook 91 from the front support shaft 88, whereby the entire reserve seedling table 11 can be rotated backward about the rear vertical axis e. .

  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. This seedling marker 100 is connected to a bracket 101 fixed to a rear support shaft 86 so that a marker arm 102 can swing around a longitudinal fulcrum g, and a marker rod 103 attached to the tip of the marker arm 102 is attached to a rubber Each of the caps 104 is made to penetrate vertically, 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. .

  Further, as shown in FIG. 18, the bracket 101 is provided with a locking metal fitting 105 made of a spring plate material in a cantilever shape, and when the reserve seedling base 11 is rotated backward about 180 degrees, The vertical pin 106 fixed near the lower end of the support 80b is elastically engaged with the locking metal fitting 105, so that the reserve seedling table 11 is held in the backward 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.

Ridge beyond the movement for loading and unloading of the rice transplanter to fields, or the like when unloading Masonry rice transplanter in the carrier such as a truck, when traveling machine body 3 is the driver's difficult tilted back and forth, the main shift lever 25 is selected to be “ultra-low speed”, the sub-shift lever 24 is selected to be “low speed”, and the engine output is set to an appropriately high value by operating the accelerator so that the vehicle can be driven at high speed and at a very low speed. The operator descends to the ground and steers while self-propelled. In this case, the front wheel 1 is moved straight 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 inclination, the front portion of the traveling machine body 3 may be lifted by the propulsion reaction force. In such a case, the operation arm 18 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 18 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 travel check mechanism 40, and the front wheel 1 is not steered by the unevenness of the road surface and the body does not move in an unexpected direction. .

  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. Further, an operator in front of the machine body can hold the tip grip portion 16b of the operation arm 16 with one hand and extend the other hand to grip the grip portion 62b of the stop lever 62.

  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 of the stop lever 62 from the stop position may be manually released from the headed locking pin 76 or may be returned by depressing the stepping portion 62a once from the driver seat 17.

  In the above-mentioned [Best Mode for Carrying Out the Invention], the following configuration may be adopted.

  The operation arm 16 is not limited to the one that is provided at the front end of the machine body so as to be able to swing up and down. For example, as shown in FIG. It can also be implemented in a U-shape that is removably equipped. 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.

Overall side view of riding rice transplanter Front view of the front of the aircraft Perspective view of the front of the aircraft Plan view of the front of the aircraft Side view of the front of the fuselage with the operating arm switched to the working position (B) Side view showing the base of the operating arm in the retracted posture (b) Side view showing the base of the operating arm in the working posture Plan view of a base of the operation arm of the store attitude The perspective view which shows the structural member of a steering check mechanism Front view showing the base of the operation arm Side view showing belt transmission and its operating structure (B) Side view showing brake in brake released state (b) Side view showing brake in brake state Top view showing main clutch and brake operation section Front view of brake Side view of fulcrum shaft end Partially cutaway side view of the lower part of the left seedling stand from the inside of the aircraft Xx sectional view in FIG. Cross-sectional plan view showing front strut fixing structure Transverse plan view of the lower part of the rear column Longitudinal front view of the upper part of the stand Side view showing ground maneuvering condition The perspective view of the front part of the body provided with the operation arm of other embodiments

Explanation of symbols

1 front wheel 2 rear wheel 3 run line aircraft
10 Engine bonnet
12 Getting on / off passage 16 Operation arm
19 Friction resistance applying means 21 Center mascot
30 Energizing means
40 Steering check mechanism 62 Stop lever