JP2005151914A - Seedling transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seedling transplanter provided with a device for adjusting the lift position of a parallel link member of a seedling transplanting apparatus and a mechanism to enable the lift of the adjusting device above an upper link member. <P>SOLUTION: A link device 2 for lifting a seedling transplanter having a seedling transplanting apparatus 3 through the lifting link device 2 to the back of a traveling vehicle body is provided with a lift cylinder 160 supported its front end with the traveling vehicle body, placed in a state inclined forward and provided with a spring-type planting level adjusting device 161 at the rear end, a lift link base frame 15 erected on the traveling vehicle body, a pair of upper and lower parallel link members 2 rotatably supported by the lift link base frame 15, and an arm 58 integrated to the lower link member 2a2 between the upper and lower parallel link members 2a1, 2a2. The upper protrusion 58a of the arm 58 is brought into contact with the adjusting device 161 of the lift cylinder 160 above the upper link member 2a1 at least in an unloaded state contacting the seedling transplanting apparatus 3 with the ground. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seedling transplanter such as a riding rice transplanter.

  A seedling planting device in a riding type rice transplanter, which is currently widely used, is connected to the rear of the traveling vehicle body, and when seedlings are planted, they are lowered onto paddy fields to plant seedlings.

  A conventional seedling planting device is a seedling transplanter equipped with a mechanism for raising the seedling planting device by pushing up the parallel link by extending a hydraulic cylinder around the base of the parallel link that raises and lowers the seedling planting device. Machines are commonly used.

However, there is also known a seedling transplanting machine equipped with a mechanism for raising the seedling planting device by rotating the parallel link upward by the operation of the lifting cylinder in the contracting direction (Japanese Patent Laid-Open No. 2002-369607).
JP 2002-369607 A

  In the configuration that raises the seedling planting device by extending the hydraulic cylinder, the tip of the hydraulic cylinder and the lifting link move in the same direction up and down, so the adjustment tool provided at the tip of the hydraulic cylinder is above the upper link. It is difficult to make the adjustment tool protrude above the upper link in the no-load state where the seedling planting device is lowered and grounded.

  Further, a seedling transplanting machine provided with a mechanism for raising the seedling planting device by rotating the lifting link upward by the operation in the contraction direction of the lifting cylinder described in JP-A-2002-369607 discloses that the adjustment tool is an upper link. Therefore, the adjustment tool could not be easily adjusted.

  Then, the subject of this invention is providing the seedling transplanting machine provided with the mechanism in which the adjustment tool of the raising position of the parallel link of a seedling planting apparatus can be raised above an upper link.

The above-mentioned problem of the present invention is solved by the following means.
In the seedling transplanting machine in which the seedling transplanting device 3 is connected to the rear portion of the traveling vehicle body via the lifting link device 2, the lifting link device 2 supports the front end portion of the traveling vehicle body. A lift cylinder 160 provided in a rear-upward manner and provided with a spring-type planting lifting / lowering adjustment tool 161 at the rear end, a lifting / lowering link base frame 15 erected on the traveling vehicle body, and the lifting / lowering link base frame 15 And a pair of upper and lower parallel link members 2 that are pivotally supported by each other, and an arm 58 that is integral with the lower link member 2a2 of the pair of upper and lower parallel link members 2a1 and 2a2. The seedling transplanting machine having an arrangement relationship that abuts against the adjusting tool 161 of the lift cylinder 160 at a position above the upper link member 2a1 in a state of no load with at least the seedling planting device 3 grounded. A.

  According to the first aspect of the present invention, when the seedling planting device 3 is grounded and no load is applied, the spring-type planting lifting / lowering adjustment tool 161 of the lift cylinder 160 is located above the pair of upper and lower parallel link members 2a1 and 2a2. Since the upper and lower pair of parallel link members 2a1 and 2a2 do not interfere with each other, the planting elevating / lowering adjustment tool 161 can be adjusted from the upper side of the upper link member 2a1, and the seedling planting device 3 is located above the link member 2a1. Can be stabilized (no hunting or the like).

An 8-row planted rice transplanter as an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in the side view of FIG. 1 and the plan view of FIG. 3, the riding type rice transplanter attaches a seedling planting device 3 which is a kind of working device to a traveling vehicle 1 with a lifting link device 2 and a fertilizer application device 4. It is configured to function as a riding fertilizer transplanter as a whole. The traveling vehicle 1 is a four-wheel drive vehicle having a pair of left and right front wheels 6 and 6 and rear wheels 7 and 7 as drive wheels.
In this specification, the left and right sides in the forward direction of the rice transplanter are referred to as the left side and the right side, respectively, the forward direction is referred to as the front side, and the reverse direction is referred to as the rear side.

FIG. 4 is a side view, FIG. 5 is a plan view, and FIG. 6 is a rear view of the frame structure of the main part of the traveling vehicle body of the riding type rice transplanter of this embodiment.
In the frame structure of the passenger rice transplanter of the present embodiment, a transmission case 11 is fixed to the front portion of the main frame 10 with bolts, and a water-cooled engine 12 is mounted on the main frame 10 behind it. A steering post 14 projects upward from the front portion of the mission case 11.

  The feature of the frame structure of the riding rice transplanter of the present embodiment is that a long main frame 10 is provided in the front-rear direction disposed between the front and rear wheels, and an elevating link base frame 15 extending upward is provided at the rear of the main frame 10, The elevating link base frame 15 is configured so that the bases of elevating parallel link members 2a and 2b for elevating a working device such as a rotary (not shown) provided on the rear side of the vehicle body can be mounted.

  Further, a connecting frame 18 is provided for supporting the pair of floor frames 9, 9 from side to side, and a lifting link base frame 15 extending in the vertical direction is connected to the connecting frame 18. A support frame 26 is provided on the base side of the lift link base frame 15, and the main frame 10 is connected to the support frame 26, so that the support frame 26 serves to connect the main frame 10 and the lift link base frame 15. In addition, a rear wheel rolling frame 27 is connected to the support frame 26.

  The rear portion of the floor frame (front frame) 9 that receives the bottom surface of the step floor 19 higher than the main frame 10 is bent downward, and is lifted and lowered via the connecting frame 18 near the main frame 10 in a side view of the traveling vehicle body. Connected to the base frame 15. The lifting link base frame 15 is connected to the main frame 10 via a support frame 26.

  Since the rear portion of the floor frame 9 is bent downward and connected to the lifting link base frame 15 near the main frame 10 in a side view of the traveling vehicle body, the base side of the lifting and lowering parallel link members 2a and 2b of the seedling planting device 3 Is sufficiently secured, the rigidity of the rolling fulcrum portion and the link fulcrum portion (not shown) of the seedling planting device 3 is increased, and the support of the seedling planting device 3 is stabilized.

  Further, a part of the floor frame 9 is used as a part of a frame for attaching the fuel tank 29, and the fuel tank 29 is held together with the fuel tank attaching frame 30 attached to the floor frame 9, so that the floor frame 9 is attached to the fuel tank 29. It will also be a protective frame. Two fuel tanks 29 are provided at symmetrical positions.

  Further, by providing the auxiliary step stay 28 with the fuel tank 29 interposed therebetween and above the fuel tank 29, the auxiliary step stay 28 can also serve as a mounting member for the fuel tank 29. There is no need to use a member. Further, there is a fuel filler opening (not shown) of the fuel tank 29 in the vicinity of the auxiliary step stay 28, and the operator can easily refuel with his / her feet. In addition, the area below the auxiliary step stay 28 is originally a dead space, but this space can be used effectively and the body can be made compact.

  In addition, a battery 45 is disposed at the front ends of the pair of floor frames 9, 9, but is spanned between the pair of floor frames 9, 9 below the front ends of the pair of floor frames 9, 9 where the batteries 45 are disposed. A bumper frame 55 is provided, and the bumper frame 55 has a bumper function. By using the pair of floor frames 9 and 9 as part of the bumper member in this way, the number of parts, weight and man-hours of the bumper can be reduced, and the function of the bumper frame 55 can be achieved while maintaining the overall rigidity of the floor frame 9. Can also be demonstrated.

  As shown in the plan view of FIG. 5, the main frame 10 and the lift link base frame 15 are connected via a support frame 26 in a plan view, and the floor frame 9 and the lift link base frame are on the left and right sides of the main frame 10. 15 is connected via a connecting frame 18, and the pair of floor frames 9, 9 and the pair of lifting link base frames 15, 15 are connected by a pair of standing frames 37, 37, respectively, The tip of 37 is supported by a U-shaped upper connecting plate 8 in plan view via a rear step frame 38, and the base of the upper connecting plate 8 is supported and fixed to the lift link base frames 15 and 15.

  Thus, the left and right directions of the pair of lifting link base frames 15 and 15 have a rigid frame structure that prevents torsion, and the pair of connecting portions of the floor frames 9 and 9 and the connecting frame 18 are left and right. Since they are separated from each other, twisting can be prevented well, and stress applied to the connecting portion of the main frame 10 and the support frame 26 can be distributed to the floor frames 9 and 9 via the connecting frame 18 when the traveling vehicle turns. The weight of the frame structure including the frame 10 and the pair of floor frames 9, 9 can be reduced.

  Further, the transmission case 11, the engine 12 and the steering post 14 can be installed inside the frame structure of the present embodiment, and the floor frame 9 can be installed while the transmission case 11, the engine 12 and the steering post 14 are mounted. Since 9 can be removed, maintenance of the engine 12 and the like is facilitated.

  Furthermore, in the frame structure of the present embodiment, a connecting plate 39 that connects the connecting portion between the mission case 11 and the main frame 10 and the floor frame 9 in the vertical direction is provided via a transfer member 41 between the floor frames 9 and 9. By providing each of them, a frame structure having high rigidity can be obtained. In particular, a pair of rhombus-shaped frame structures composed of the floor frame 9, the main frame 10, and the transmission case 11 greatly contribute to the rigidity of the traveling vehicle body.

  Since the front wheel axles 42 and 42 are provided outside the floor frames 9 and 9, front wheel axle fixing portions 49 and 49 can be attached to the floor frames 9 and 9, respectively.

  Further, the HST 5 is disposed above the mission case 11, and the hydraulic pump 13 (FIGS. 1 and 21) feeds oil to the power steering cylinder 59 and the lift valve unit 67 for the lift cylinder 160 of the seedling planting device.

  As shown in FIG. 1, a mission case 11 and an engine 12 are arranged on the front and rear of a main frame 10, and a hydraulic pump 13 is integrally assembled on the rear upper surface of the mission case 11. A steering post 14 projects upward from the front.

  A steering handle 16 and an operation panel 17 are provided at the upper end of the steering post 14. A step floor 19 serving as a control floor is attached to the upper part of the airframe, and a cockpit seat 20 is installed above the engine 12. The front wheels 6, 6 are pivotally supported by front wheel support cases 22, 22 provided on the side of the mission case 11 so that the direction can be changed. The rear wheels 7 and 7 are pivotally supported by rear wheel support cases 24 and 24 that are integrally attached to the left and right ends of the rolling rod 23. The rolling rod 23 is supported by a rolling shaft 25 protruding from the rear end of the main frame 10 so as to be rotatable in a plane perpendicular to the traveling direction.

  A cover 99 protruding from the step floor 19 is provided, and operating tools such as a transmission lever 110 and a saddle clutch lever 127 are arranged only on one side of the cover 99. As shown in FIG. 6, the cover 99 can be rotated in the left-right direction around the rotation fulcrum opposite to the operation tool such as the speed change lever 110 so that the inside of the cover can be opened. The cover 99 is opened and closed not in the longitudinal direction of the machine body but in the lateral direction.

  For this reason, the cover 99 can be largely rotated without the operation tool getting in the way. There is also an advantage that the operating tool can be operated even when the cover 99 is opened and closed. Further, maintenance inside the cover can be performed from the step floor 19 on the operation tool side.

An engine 12, an air cleaner 21, a radiator 44, an air filter / plug (not shown), and the like are disposed inside the cover 99, and the air cleaner, the 21 radiator 44, and a plug are disposed on the opposite side of the cover 99 from the rotation fulcrum. Therefore, maintenance of these devices can be easily performed after the cover is opened.
Further, not only the transmission lever 110 but also all the operation levers such as the throttle lever 130 and the saddle clutch lever 127 and the brake pedal 140 are laid out on the right side of the body.
As described above, since the operation lever and the pedal are laid out only on the right side of the machine body, the space on the left side during the actual work is wide and there is no obstacle, so the workability is improved.

  In addition, two fuel tanks 29 are arranged on both sides of the engine 12 in communication with each other to improve the weight balance. However, by arranging the fuel supply port only on the right side where the fuel gauge is located, the fuel tank 29 can contain fuel when refueling. The amount is easy to understand. Further, since the fuel supply port of the fuel tank is arranged on the right side opposite to the muffler (not shown) of the engine exhaust part, it is possible to eliminate the risk of fuel being applied to the muffler during refueling and ignition.

  Further, on the left side of the engine 12, there are a muffler and a pulley belt, which may cause interference. Although it is easily affected by heat, in the configuration of this embodiment, by concentrating and arranging the hydraulic hose and harness on the cooling side (right side) of the engine 12, heat and interference of the drive unit (pulley and belt) are prevented. You can avoid it.

  As shown in the power transmission mechanism diagram for the front and rear wheels in FIG. 7, the rotational power of the engine 12 is transmitted to the counter shaft 32 that is the drive shaft of the hydraulic pump 13 via the belt 31, and further from the counter shaft 32 to the belt. 33 is transmitted to the input shaft 35 of the hydraulic transmission HST5 through the transmission shaft 33, and is transmitted from the output shaft 36 of the hydraulic transmission HST5 to the mission input shaft 34 through the belt.

  A main clutch 43 is provided on the mission input shaft 34, and the driving force of the hydraulic transmission HST 5 is transmitted to the mission input shaft 34 via the main clutch 43. The main clutch 43 is a well-known multi-plate clutch.

  The turning clutch and the rear wheel brake device (not shown) are operated by a pedal 140 disposed on the right side of the handle post 14 in the forward direction provided on the step floor 19.

The seedling planting device 3 is mounted on the traveling vehicle 1 so as to be movable up and down by the lifting and lowering link device 2, and the configuration of the lifting mechanism and the seedling planting device 3 will be mainly described with reference to FIGS. 1 and 2.
First, a spring type planting part lifting / lowering adjustment tool 161 provided at the upper end of a piston of a general lift cylinder 160 whose base part is rotatably provided in the traveling vehicle 1 is brought into contact with the arm 58 of the lifting / lowering link device 2. The hydraulic pump 13 provided in the traveling vehicle 1 supplies and discharges the pressure oil to and from the lift cylinder 160 through the lift valve 80 (FIG. 21), and the piston of the lift cylinder 160 is extended and retracted to raise and lower the link device. The seedling planting device 3 connected to 2 is configured to be moved up and down.

  The elevating link device 2 includes an elevating link base frame 15 erected on the main frame 10, elevating parallel link members 2 a and 2 b that move up and down of the elevating link device 2, and a lift cylinder 160. A spring type planting part elevation adjustment tool 161 is provided at the tip of the cylinder rod 160a, and the bottom part of the spring type planting part elevation adjustment tool 161 contacts the link 2a2 below the parallel link member 2a (2a1, 2a2). An arm 58 having a protrusion 58a at the site is fixed.

  The base of the lift cylinder 160 is supported by the main frame 10 at a position below the engine 12, and a cylinder rod 160a that expands and contracts is disposed on the opposite side of the support, and the cylinder rod 160a has the above-described tip at the tip. A spring type planting part lifting adjustment tool 161 is attached. When the lift cylinder 160 contracts, the arm 58 rotates counterclockwise about the lower link 2a2, so that the seedling planting device 3 side of the parallel link members 2a and 2b rises.

  As shown in FIG. 2, a swing spring 161c that extends and contracts in the longitudinal direction of the cylinder rod 160a is disposed inside the two plates 161a and 161b whose distance can be adjusted. The allowable distance in the longitudinal direction of the cylinder rod 160a between the two plates 161a and 161b is such that the rod 161d fixed to one plate 161b penetrates the other plate 161a, and the penetrated rod portion is tightened with a lock nut 161e. Can be adjusted.

  If the sensitivity of the elevation sensor 207 (FIG. 12) of the sensor float 165 attached to the support portion on the distal end side of the sensor float 165 is too high, the elevating link device 2 causes hunting at the time of elevating. Adjust the tool 161. In addition, since the spring type planting part lift adjustment tool 161 is above the link 2a1 above the parallel link 2a, the operator puts his body between the traveling vehicle 1 and the seedling planting device 3 from the side of the machine body and is spring type. The position of the lock nut 161e of the planting part raising / lowering adjustment tool 161 can be easily adjusted from above without the upper link 2a1 getting in the way.

  In the above configuration, since the lift cylinder 160 is connected to the lower link 2a2 so that the lift link device 2 is lifted by contraction of the lift cylinder 160, the lift cylinder 160 is lifted so that the lift link device 2 is lifted by extension. Compared to the configuration in which the cylinder 160 is connected to the upper link 2a1, the cylinder 160 can be arranged at a lower position, and the position of the center of gravity of the elevating link device 2 can be lowered.

  Further, the lift cylinder 160 can be made small by using a pull, and by providing a fulcrum on the main frame 10, a space can be provided above the lift cylinder 160, so that the lift cylinder 160 and the engine 12 can be easily maintained. Became.

  The seedling planting device 3 is supported by a planting transmission case 162 that also serves as a frame that is freely mounted on the rear part of the lifting link device 2 via a rolling shaft, and a support member provided in the planting transmission case 162. The seedling mounting table 163 that reciprocates in the left-right direction of the machine body and the seedling planting that is attached to the rear end portion of the planting transmission case 162 and that separates seedlings for one stock from the lower end of the seedling mounting table 163 and is planted in the field. And a sensor (center) float 165, a side float 166, etc., which are leveling bodies whose rear part is pivotally supported at the lower part of the planting transmission case 162 and whose front part is swingably movable up and down. It is configured. The sensor float 165 and the side float 166 are provided to level the field and level the front of the field where the seedlings are planted by the seedling planting tools 164.

  The PTO transmission shaft 167 has universal joints at both ends, and is provided to transmit the power of the fertilization drive case 168 to the planting transmission case 162 of the seedling planting device 3. The elevating link sensor 169 is provided between the elevating link base frame 15 erected on the main frame 10 and the elevating parallel link members 2a and 2b that move up and down of the elevating link device 2, and detects the movement of the link 169a. It is a potentiometer and can detect that the seedling planting device 3 has been raised to the highest position by manual operation or the like. And the angle-of-attack sensor 207 (FIG. 1) provided in the front part of the sensor float 165 detects the height of the seedling planting device 3 with respect to the ground, and controls based on the detection value of the angle-of-attack sensor 207. The lift valve 80 is controlled by the device 215 (FIG. 26), and the vertical position of the seedling planting device 3 is controlled by the lift cylinder 160.

  That is, when the angle sensor 207 detects that the front part of the center float 165 has been lifted to an appropriate range or more by an external force, the hydraulic oil pumped from the transmission case 11 by the hydraulic pump 13 is transferred to the lift cylinder 160. Then, the piston is protruded and the lifting link device 2 is moved up to raise the seedling planting device 3 to a predetermined position, and the angle sensor 207 is used to detect that the front part of the center float 165 has fallen beyond the proper range. Is detected, the pressure oil in the lift cylinder 160 is returned into the mission case 11 and the lifting link device 2 is moved downward to lower the seedling planting device 3 to a predetermined position. When the front part of the center float 165 is in the proper range (when the detection value of the angle-of-attack sensor 207 is in the proper range and the seedling planting device 3 has the proper ground height), It is provided to stop the pressure oil from entering and leaving the seedling planting device 3 in a fixed position. Thus, the center (senser) float 165 is used as a grounding sensor for automatic height control of the seedling planting device 3.

  Further, the lifting valve unit 67 (FIG. 21) for operating the hydraulic cylinder (lifting cylinder) 160 of the seedling planting device 3 is disposed in the vicinity of the steering valve unit 62 (FIG. 21) for operating the power steering cylinder 59.

  The seedling planting device 3 is supplied to a transmission case 162 that also serves as a frame, a seedling mounting table 162 that feeds the seedlings to the seedling outlets 162a of each line by placing the seedlings and reciprocating left and right, and supplied to the seedling outlets 163a. The seedling mounting base 163 is slidable to the left and right by the power on the traveling vehicle body via the planting transmission shaft 167 (FIG. 1). The seedling located at the lowermost stage of the seedling stage 163 is supplied to the seedling outlet 163a (FIG. 3), and the planting device 3 plants the seedling in the field. When the seedling stage 163 moves to the end of the left and right stroke and all the seedlings in the lowermost stage are planted, the seedling feeding belt 184 (FIGS. 1 and 10) operates to lower the seedling on the stage by one stage. Transfer to In addition, a pair of left and right drawing markers 223, 223 and the like for drawing the aircraft course in the next stroke to the topsoil surface are provided.

  The floats 165 and 166 provided at the lower part of the seedling planting device 3 are rotatably mounted so that the front end side moves up and down according to the unevenness of the soil surface of the field, and the sensor (center) float 165 at the time of planting work. Is detected by a vertical motion detection mechanism (elevation angle sensor 207), and the seedling planting apparatus 3 is moved up and down by switching the lifting valve 80 that controls the lift cylinder 160 according to the detection result. The planting depth is always kept constant.

  Moreover, the clutch which switches the operation | movement and stop of the planting apparatus 3 by two adjacent units is provided. Since this clutch is often operated to “disengage” at the time of work at the heel side, it is usually called “the heel clutch”. The hook clutch 186 is turned on and off by a hook clutch lever 127 provided on the handle post 14.

  FIG. 8 shows the power transmission to the heel clutch 186 and the seedling feed belt 185 in the configuration of 6 rows (FIG. 3 shows the case of 6 rows for the sake of simplicity). The rear view of the principal part of an apparatus is shown. The number of cables 189 for 畦 clutch operation controlled by the 畦 clutch lever 127 is three up to the seedling planting device 3 (in the case of six-row planting). However, in this embodiment, the cable 189 is operated simultaneously with the seedling planting. The feed belt 185 is activated and simultaneously deactivated.

  Three seedling clutch operating portions 216 (FIG. 8) for actuating the saddle clutch are respectively fixed to the rear surface of the seedling mount 163, and the swinging clutch arm 212 is provided with a swing arm 212, respectively. A cable 189 for operating each hook clutch is connected to one end of the arm 212 with the center portion of the arm as a rotation fulcrum. Further, the tip of the cable 217 for operating the seedling feeding belt 185 is fixed to the other end of the swing arm 212.

  If the cable 217 is routed between two adjacent seedling platforms 163, the cable 217 is not damaged. This is because the seedling stage 163 moves laterally to the left and right, so that the right and left balance of the seedling planting device 3 is corrected in response to the left and right movement of the seedling stage 163, the seedling stage 163 and the parallel link member 2b Since it may interfere with the balance spring (not shown) stretched right and left just before the seedling stage 163 so as to bridge the gap and damage the outer of the cable 217, if it is inserted into the joint of the seedling stage 163, The balance spring can be bypassed without contacting other parts.

  Further, FIG. 9 shows a connection portion between the heel clutch 186 and its operating cable 189, and FIG. 10 shows a connection portion between the seedling feeding belt 185 and its operating cable 217. The heel clutch 186 provided in the transmission case 162 has a drive side clutch body 187 fixed to the transmission shaft 3a of the seedling planting device 3, a passive side having a clutch tooth 187a of the clutch body 187 and a detachable clutch tooth 188a. A clutch body 188 is provided, and the passive clutch body 188 is always urged to the transmission shaft 3a side by a spring 218, a sprocket 220 and a washer 221, and the saddle clutch 186 is normally in an operating state (the cable 189 is pulled). State).

  A clutch pin groove 188b is provided on the side surface of the passive clutch body 188, and a hook clutch pin 222 connected to the tip of the cable 189 is detachably provided in the groove.畦 Clutch pin 222 is provided in the hole so as to pass through the hole in the wall surface of transmission case 162, and can be protruded from the wall surface of case 162 to the inside of case 162 by spring 224. Accordingly, when the cable 189 is pulled, the saddle clutch pin 222 is moved in the direction of being pulled out of the clutch pin groove 188b of the passive clutch body 188. When the saddle clutch pin 222 is pulled out from the clutch pin groove 188b of the passive clutch body 188 by a predetermined pulling amount, the saddle clutch 186 is "on" by the urging force of the spring 224. The heel clutch 186 is a fixed position stop clutch when the seedling is not planted (the heel clutch 186: “OFF”), and when the cable 189 is pulled, the heel clutch 186 is “ON”.

  When the hook clutch 186 is disengaged, the cable 189 is loosened, so that the hook clutch pin 222 enters the clutch pin groove 188b by the urging of the compression spring 224, and the passive side clutch body 188 rotates in that state. The passive side clutch body 188 is gradually moved to the compression spring 218 side against the compression spring 218 by the guide of the clutch pin groove 188b, and a predetermined rotational position of the passive side clutch body 188 (the rotational direction of the clutch pin groove 188b). The clutch teeth 187a and 188a are disengaged for the first time in a state where the hook clutch pin 222 is located at the end), and the passive clutch body 188 stops at a fixed position.

  It should be noted that the compression spring 224 is not contracted by the urging force of the compression spring 218 and the hook clutch pin 222 is not pushed back to the cable 189 side.

The saddle clutch 186 is a fixed position stop clutch. The reason is that the planting tool of the seedling planting device 52 is stopped at a predetermined position (one planting tool is stopped just before seedling scraping and the other planting tool is stopped at a phase after planting). This is because the planting tool keeps the seedling and does not stop. Incidentally, the transmission ratio by the chain 225 from the sprocket 220 that rotates integrally with the passive clutch body 188 to the transmission shaft 3a of the seedling planting device 3 is reduced by half, and the operation cycle of the seedling planting device 3 is reduced. Is half of one rotation of the transmission shaft 3a (half rotation), so that the transmission shaft 3a of the seedling planting device 3 has a 180 degree phase with respect to one stop position by the passive clutch body 188. It is configured to stop at two different places.
When the heel clutch 186 is “on”, the chain 225 locked to the sprocket 220 is driven, and the seedling planting device 3 operates.

  Further, in the configuration shown in FIG. 8, the hook clutch operating cable 189 is moved to the operating side by swinging the swing arm 212 in the direction of arrow A, so that the seedling feeding belt 185 operating cable 217 is simultaneously operated. Can be moved in the direction in which the seedling feeding belt 185 operates.

  FIG. 10 shows the configuration of the operating portion of the seedling feeding belt 185. The cable 217 is connected to one end of an L-shaped shifter arm 227, and the other end of the shifter arm 227 is connected to the drive side clutch body 187 of the seedling feed drive roller 228. The drive-side clutch body 187 is switched between “ON” and “OFF” in accordance with the movement toward the “OFF” side. The drive side clutch body 187 can be engaged with and disengaged from the seedling feed roller 228 via the clutch teeth 228a and 187a, and the seedling feed drive roller 228 is adjacent to the side of the seedling feed drive roller 187 opposite to the drive side clutch body 187. They are connected via clutch teeth 228a and 228a that are always meshed with the roller 228. A seedling feed driven roller 229 is provided at a position parallel to the seedling feeding drive roller 228, and a seedling feeding belt 185 is wound between the rollers 228 and 229. In addition, since the central shaft 228b of the roller 228 is loosely fitted to the roller 228 and is integrated with the driving side clutch body 187, the roller 228 is engaged when the driving side clutch body 187 and the roller 228 are engaged. The seedling feed belt 185 can be driven.

  Therefore, the drive side clutch body 187 of the seedling feeding belt 185 can be switched between operating and non-operating by switching the passive side clutch body 188 of the heel clutch 186 by the cable 189 for operating the heel clutch. In this way, with the configuration shown in FIG. 8, when the swing arm 212 swings in the direction of arrow A, the hook clutch operating cable 189 is moved to the operating side and the seed feeding belt 185 operating cable 217 is simultaneously driven. The seedling feed belt 185 can be actuated by moving to the side where the side clutch body 187 and the roller 228 are engaged. Further, when the swing arm 212 swings in the direction opposite to the arrow A direction, the hook clutch operating cable 189 moves the hook clutch 186 to the non-operating side, and at the same time, the seedling feeding belt 185 operating cable 217 is moved to the seedling feeding belt. 185 can be moved to the non-actuated side.

  That is, the hook clutch 186 and the seedling feeding belt 185 can be simultaneously operated by the operation of each hook clutch lever 127, and can be simultaneously disabled.

  In addition, as shown in the rear view of the main part of the seedling planting part in FIG. 11, the seedling planting gear transmission gear case 246 in the seedling planting device 3 is located on the right side of the aircraft in the rear view of the seedling planting part. By arranging the drawing marker driving device 232 for drawing and the seedling feeding device of the seedling mounting table 163 on the left side, the weight balance can be improved.

  Further, the engine power is transmitted to the transmission shaft 3 a by the bevel gear mechanism in the seedling planting tool transmission gear case 246 of the planting transmission case 162. When the clutch 186 is engaged, the claw (not shown) of each seedling planting tool 164 is driven by the chain 225.

  Further, a lead cam that moves to the left and right while engaging with a groove 247a provided on a constantly rotating lead cam shaft 247 extending from the seedling planting gear transmission gear case 246 and engaging with a projection provided on the inner periphery toward the central axis. The seedling mount 163 connected to the H.248 moves to the left and right.

  When the lead cam 248 moves left and right, for example, when it moves to the left, the left and right lateral feed pieces (with one-way clutch) 249a and 249b in which the contact piece 247b at the tip of the lead cam shaft 247 is directly connected to the vertical feed transmission shaft 249, The transmission shaft 249 is rotated by the amount of one planting of the seedling of the vertical feed belt 185 when it hits the right lateral feed piece 249b. The transmission shaft 249 is interlocked with the shaft 228b of the roller 228, and when the drive side clutch body 187 and the roller 228 are engaged, the longitudinal feed belt 185 for three strips can be moved by one planting of the seedling. it can.

Further, the sensitivity adjustment device of the sensor float 165 can be configured as shown in the side view of FIG. 12 so that the output of the angle-of-attack sensor 207 is changed by expansion and contraction of a single spring.
A float support arm 261 having one end rotatably connected to the rear end portion of the sensor float 165 rotates around the axis of a planting depth adjusting pipe (rotating shaft) 260 provided at the front end portion. When the rear end of the arm 261 moves up and down by operating the depth adjustment lever (located on the seedling planting device 3 side), the rear part of the sensor float 165 moves up and down to increase the seedling planting depth. It can be adjusted.

  Since the planting depth adjusting pipe (rotating shaft) 260 is provided integrally with the angle-of-attack interlocking arm 262, the angle-of-attack interlocking arm 262 also moves integrally with the rotation of the float support arm 261. The attack angle interlocking arm 262 is rotatably connected to the upper link 265 of the parallel links 265 and 266 via the attack angle interlocking rod 264. Ends of the upper and lower links 265 and 266 are rotatably supported by the machine body. An angle sensor base plate 268 is supported at the front ends of the parallel links 265 and 266. The angle-of-attack sensor base plate 268 is a U-shaped member with a short left side when viewed from the front, and a float arm 269 disposed in the angle-of-attack sensor base plate 268 is connected by a rotation fulcrum 268a. The float arm 269 is a U-shaped member in plan view, and the tip portions on both sides thereof are rotatably supported by the sensor float 165 and are rotatable to a front-side U-shaped float link 270 rising upward in the vertical direction. Supported by pins 276.

  In addition, an angle-of-attack sensor 207 is attached to the right side surface of the angle-of-attack sensor base plate 268 via an angle-of-attack sensor mounting portion 267. Further, a hook 274 having two locking portions is attached to the planting depth adjustment pipe 260, and a float sensing load adjustment spring 273 is interposed between the hook 274 and the lower end of the float arm 269. It is stretched.

  The spring 273 has a function of adjusting the load of the sensor float 165, and the spring 273 is attached to the tips of the two U-shaped ends of the float arm 269. The attachment position of the float sensing load adjustment spring 273 to the float arm 269 is on the same side (left side) with respect to the angle-of-attack adjustment rod 264 attached to the upper link 265 and the center line in the front-rear direction on the sensor float 165.

  Thus, since both the float sensing load adjustment spring 273 and the angle-of-attack interlocking rod 264 are offset from the center line in the front-rear direction of the sensor float 165, the float sensing load adjustment spring 273 is connected to the hook 274. Not only is it easy to select the step locking position and adjust the length of the turnbuckle angle-of-attack interlocking rod 264, but also the center of the sensor float 165 in the front-rear direction with respect to the angle-of-attack sensor 207. Since it is on the opposite side of the line, both adjustments can be made from the left and right sides of the sensor float 165, making adjustment easier.

  In addition, since the pulling direction of the spring 273 that increases the sensitivity load at the angle of attack of the sensor float 165 is horizontal, mud does not accumulate between the springs 273, the performance is stable, and the appearance is simple. Become.

  Further, the output of the angle-of-attack sensor 207 changes according to the sensitivity of the spring 273, and the sensor float 165 can be moved up and down.

  In the rice transplanter of this embodiment, a finger lever 171 (FIG. 3) is arranged below the steering handle 16, and when the finger lever 171 is operated in the vertical direction, a finger lever switch (not shown) is activated, and the PTO of the control device 215 is operated. The PTO clutch operation SOL is operated by the clutch operation means, the PTO clutch 170 (FIG. 22) for connecting / disconnecting the power provided in the fertilization drive case 168 (FIG. 1) is operated, and the fertilizer application device 4 and the seedling planting device 3 are operated. The seedling planting device 3 is manually operated by operating the lifting valve 80 (FIG. 21) by the lifting means of the seedling planting device 3 of the control device 215. It is configured to move up and down.

  That is, when the finger lever 171 is operated to “up”, the PTO clutch 170 is disengaged, the operations of the fertilizer application device 4 and the seedling planting device 3 are stopped, and the lifting valve 80 forcibly raises the seedling planting device 3. Is switched to.

  Then, after the finger lever 171 is operated “up” and then the finger lever 171 is operated once “down”, the lift valve 80 is automatically controlled by the vertical movement of the sensor float 165, and the seedling planting device If 3 is raised, the seedling planting device 3 is lowered until the sensor float 165 comes into contact with the ground and reaches an appropriate posture. Further, when the finger lever 171 is operated to “down” once more, the PTO clutch 170 is entered and the fertilizer application device 4 and the lift valve 80 (FIG. 21) remain in the automatic control state in which the lift valve 165 is switched by the vertical movement of the sensor float 165. The seedling planting device 3 is driven. Thereafter, each time the finger lever 171 is operated to “down”, the PTO clutch 170 (FIG. 22) is alternately turned on and off in the automatic control state in which the elevating valve 80 is switched by the vertical movement of the sensor float 165. Can be switched.

Here, the configuration of the portion where the steering wheel 16 steers the front wheels 6 will be described based on the plan view of FIG. 14 and the perspective view of FIG.
The steering handle 16 is fixed to the upper part of the steering shaft provided in the steering post 14, and the rotation of the steering shaft is decelerated via a steering transmission gear provided in the transmission case 11 and transmitted to the output shaft 174. The And the lower end of the output shaft 174 protrudes from the bottom face of the mission case 11, and the pitman arm 175 is fixed. The front left and right sides of the pitman arm 175 and the left and right front wheel support cases 22 and 22 (FIG. 1) are connected by left and right rods 176 and 176 (FIG. 1).

  Accordingly, when the steering handle 16 is turned, the steering wheel 16 is transmitted to the steering shaft, the steering speed change gear, the output shaft 174, the pitman arm 175, the left and right rods 176 and 176, and the left and right front wheel support cases 22 and 22, Is steered from side to side.

  On the other hand, an operating roller 177 is rotatably provided on the upper surface of the rear part of the pitman arm 175, and a notch 178 cut out in a U shape in plan view so as to surround the left and right sides of the operating roller 177 is provided. A follower 179 having the transmission case 11 is rotatably supported on the bottom surface of the mission case 11. The left and right side portions of the driven body 179 are connected to the front portions of the left and right rods 180 and 180 connected to the left and right clutch operation arms 86I and 86I. Therefore, when the steering handle 16 is turned to the right by a predetermined amount (the amount that the operator turns to the right with the intention of turning the aircraft to the right), the pitman arm 175 is also turned to the right, and the operation roller 177 is moved in the (c) direction. In order to push the left side surface 178a of the notch 178 of the driven body 179, the driven body 179 is rotated in the direction (D), the right rod 180 is pulled, and the right clutch operation arm 86I is operated. Since the right side clutch I is disengaged and the right rear wheel 7 on the turning center side is in an idle state, the right rear wheel 7 does not damage the cultivator and also makes the mud surface rough by lifting a large amount of mud. There is nothing that can be done to make the right turn smooth and clean.

  Conversely, when the steering handle 16 is turned to the left by a predetermined amount or more, the pitman arm 175 is also rotated to the left, the operating roller 177 is rotated in the opposite (C) direction, and the right side surface 178b of the notch 178 of the follower 179 is In order to push, the driven body 179 is rotated in the opposite direction (d), the left rod 180 is pulled, the left clutch operating arm 86I is operated, the left side clutch I is disengaged, and the left rear wheel 7 on the turning center side is Since it is in an idle state, the left rear wheel 7 does not damage the cultivator, and does not cause the mud surface to be lifted up by a large amount of mud, so that the left turn can be made smoothly and cleanly.

  Further, left and right sensor pressing pieces 182 and 182 are provided on the upper surface of the front portion of the pitman arm 175. When the steering handle 16 is rotated 200 degrees to either the left or right, an auto lift fixed to the bottom surface of the mission case 11 is provided. The switch 183 is turned on (the steering handle 16 rotates up to 360 to 400 degrees to the left and right).

  The HST (hydraulic transmission) 5 is operated by a shift lever 110 (FIG. 3) provided on the right side of the cockpit 20. As shown in FIG. 16, which is a perspective view for explaining the operation as seen from the front side of the machine body, the speed change lever 110 is supported by the shaft 113 on the operation lever base 112 that is rotatably supported by the machine body in the front-rear direction. It is supported so as to be rotatable in the left-right direction, and is configured to be operated in a crank shape. Further, the degree of rotation of the speed change lever 110 is detected by the speed change lever sensor 111 a that is in contact with the operation lever base 112. A long hole for restricting the operation stroke of the speed change lever 110 and a pin 112a on the operation lever 110 side are provided.

  The operation lever base 112 is connected to an arm 116 of a positioning shaft 115 that is rotatably supported by a body by a rod 114. A fan-shaped cam plate 117 is fixed to the positioning shaft 115, and an arc in which a position roller 119 urged by a spring 118 when the speed change lever 110 is in the neutral position N is fitted to the cam plate 117. The groove 117N, the arc groove 117F into which the position roller 119 urged by the spring 118 when the speed change lever 110 is at the maximum forward speed position F, and the spring 118 when the speed change lever 110 is at the maximum reverse speed position R. A circular arc groove 117R into which the biased position roller 119 is fitted is formed.

  The positioning shaft 115 is provided with an HST operation arm 120, and this HST operation arm 120 is connected to a trunnion operation arm 122 fixed to a trunnion shaft 121 of the HST 5 by a rod 123.

  Therefore, when the speed change lever 110 is in the neutral position N, the position roller 119 is fitted into the circular arc groove 117N of the cam plate 117, the HST 5 is held in the neutral state, and the airframe is stopped. As the shift lever 110 is operated from the neutral position N toward the maximum forward speed position F, the rod 114, the arm 116, the positioning shaft 115, the HST operation arm 120, the rod 123, the trunnion operation arm 122, and the trunnion shaft 121 are linked. The trunnion shaft 121 is gradually operated in the forward direction, and the forward speed of the aircraft gradually increases.

  On the contrary, as the shift lever 110 is operated from the neutral position N toward the maximum reverse speed position R, the rod 114, the arm 116, the positioning shaft 115, the HST operation arm 120, the rod 123, the trunnion operation arm 122, the trunnion shaft 121, Acting in cooperation, the trunnion shaft 121 is gradually operated in the reverse direction, and the reverse speed of the aircraft gradually increases.

  On the other hand, an operation wire 131 connected to a throttle lever 130 rotatably supported in the front-rear direction on the airframe is linked to the accelerator operation mechanism of the engine 12, and the operation wire 131 is operated when the throttle lever 130 is operated in the speed increasing direction. Is operated in the direction B, and the accelerator operating mechanism is operated in the fully open direction to increase the rotation of the engine 12. An engagement member 132 is fixed in the middle of the operation wire 131, and the operation wires 134R and 134F are respectively connected to the upper arm 133R and the lower arm 133F provided on the positioning shaft 115 in the vertical direction. Are connected to the lower end of the accelerator interlocking arm 135, the accelerator interlocking arm 135 is rotatably supported by the airframe, and the upper part thereof is a hook-shaped part 135 a, and the operation wire 131 on the engine 12 side of the engaging member 132. (The hook-shaped portion 135a can move freely outside the operation wire 131. In other words, the operation wire 131 can freely move inside the hook-shaped portion 135a. It can be moved in the direction and anti-bending direction).

  Accordingly, when the throttle lever 130 is operated in the speed increasing and deceleration directions, the rotational speed of the engine 12 can be adjusted via the operation wire 131. On the other hand, as the shift lever 110 is operated from the neutral position N toward the maximum forward speed position F or the maximum reverse speed position R, the operation wire 134F / 134R is pulled by the rotation of the lower arm 133F or the upper arm 133R, and the accelerator-linked arm. Since the hook-shaped part 135a of 135 is moved in the B direction, the hook-shaped part 135a contacts the engaging member 132 and operates the operation wire 131 in the direction B to operate the accelerator operating mechanism in the fully open direction. Increase the rotation of the engine 12. That is, the speed of the engine 12 is increased as the vehicle speed is increased by the speed change lever 110. Therefore, since the speed change operation and the speed of the engine 12 can be simultaneously performed by the speed change lever 110, the operability is good and the work efficiency is good (the throttle lever 130 need not be operated). Further, when the speed change lever 110 is decelerated to the lowest speed at the neutral position N, the hook-shaped portion 135a starts to come into contact with the engaging member 132, so that the speed change lever 110 is at the neutral position N. The speed of the engine 12 can be adjusted up and down freely with the throttle lever 130. When the shift lever 110 is operated halfway from the neutral position N to the maximum forward speed position F or the maximum reverse speed position R, it is automatically The rotational speed of the engine 12 can be freely increased by the throttle lever 130 from the throttle position raised in conjunction.

  Further, the pedal 140 can operate both the main clutch 43 (FIG. 7) and the left and right rear wheel brake devices (not shown), and is disposed on the lower right side of the steering handle 16. When the pedal 140 is depressed, The main clutch 43 is disengaged, the left and right rear wheel brakes are applied, and the aircraft stops.

  As for the operation position of the speed change lever 110, a lever guide 98 as shown in FIG. An enlarged plan view of the lever guide 98 is shown in FIG. In addition, a step floor 19 is provided on the left and right of the steering post 14 so as to be able to go to the front side of the aircraft.

  Guide grooves that guide the lever guide 98 to the forward travel position at the time of seedling planting extend in the front-rear direction on the handle post 14 side. Further, a PTO guide groove is provided on the outer side of the guide groove for forward and backward movement of the lever guide 98, and a guide groove for running on the road is further provided on the outer side. Therefore, the forward travel guide groove for seedling planting, the PTO guide groove, and the road travel guide groove are arranged in parallel.

  As described above, the guide groove for driving only the farm work apparatus (PTO) is provided on the side (right side) opposite to the steering post 14 with respect to the guide groove for forward and backward advancement of the lever guide 98 in the field. The traveling in a normal field with high frequency of use only requires an operation of moving in the guide groove for the forward / rearward movement on the steering post 14 side, that is, on the cockpit side, so that the operability of the shift lever 110 is good. Further, when the operator travels on the step floor 19 with the front end of the machine body attached to a heel or the like and gets on and off the machine for seedling replenishment or fertilizer replenishment work, for example, the speed change lever 110 is positioned in the forward / reverse operation path. Thus, it is difficult to interfere with an operator traveling on the step floor 19.

  Further, a guide groove for the forward / rearward movement of the lever guide 98 is disposed near the steering handle 16 that is easy to operate. Further, the guide groove for driving forward and backward and the guide groove for driving only the farm work device 3 are arranged separately on the left and right sides of the lever guide 98 and are clearly distinguished from each other, thereby preventing erroneous operation of the transmission lever 110. Further, since the guide groove for the forward / rearward movement is disposed near the steering handle 16 that is easy to operate, the shift lever 110 can be easily operated using the guide groove for the forward / backward movement during normal work.

  Further, the guide groove for driving forward and backward and the guide groove for driving only the agricultural working device 3 are arranged on the left and right sides, so that they are clearly distinguished, preventing erroneous operation of the shift lever 110, and excellent operation safety of the shift lever 110. ing.

Next, a cooperative configuration of the pedal 140 will be described based on a front view showing the cooperation of the operation members of the handle post portion of FIG. 17 and a perspective view of FIG.
The pedal 140 can operate both the main clutch 43 and the left and right rear wheel brake devices, and is disposed on the lower right side of the steering handle 16. When the pedal 140 is depressed, the main clutch 43 is disengaged, and then the left and right rear wheels. The brake is applied and the aircraft stops.

  A boss portion 140a provided at the base portion of the pedal 140 is externally fitted to a rotation support shaft 142 rotatably supported by the airframe, and is fixed to the rotation support shaft 142 by a split pin 140b. Then, the rotation support shaft 142 is also configured to rotate integrally. The base portion of the left and right brake operating arm 143 is welded and fixed to the boss portion 140a of the pedal 140, and an operating rod 144 is provided at the tip of the left and right brake operating arm 143 downward. The lower end of the actuating rod 144 is welded and fixed to the right end of the counter shaft 145 rotatably supported by the machine body through a long hole 144a formed in the lower end thereof. It is connected to the upper part of 146R. A left arm 146L is fixed to the left end of the counter shaft 145 by welding.

  Left and right connecting rods 147L and 147R are provided from the lower portions of the right arm 146R and the left arm 146L toward the rear, and the rear ends of the left and right connecting rods 147L and 147R are left and right shifters 85J for operating the left and right rear wheel brake devices, It is connected to left and right brake operation arms 86J and 86J for operating 85J.

  On the other hand, the base portion of the arm 148 is fixed to the rotating support shaft 142 by welding, and a main clutch operation cam roller (bearing) 148a is provided at the distal end portion of the arm 148 so that the pedal 140 is depressed. When the arm 148 is moved up, a clutch cam 149 provided with a base pivotally supported on the airframe is pushed up and operated. An operating rod 150 is provided at the front end of the clutch cam 149 downward, and the lower end of the operating rod 150 is connected to a front end portion of an arm 152 provided in a clutch shifter 151 that is rotatably supported by the airframe. Yes. The clutch shifter 151 is configured to be able to turn on and off the main clutch 43 by operating a sliding member (not shown).

  Further, the shape of the lower surface 149a of the clutch cam 149 with which the main clutch operating cam roller 148a contacts is formed so that the main clutch 43 is operated by pushing up the clutch cam 149 as soon as the pedal 140 is depressed and the arm 148 starts to move upward. After the main clutch 43 is disengaged and the main clutch 43 is disengaged, the main clutch actuating cam roller 148a is configured to roll only the linear portion 149b of the lower surface 149a and hardly move the clutch cam 149 upward.

  That is, when the operator depresses the pedal 140, the left and right brake operating arms 143 and 148 are pivoted upward. At that time, the main clutch operating cam roller 148a of the arm 148 immediately pushes up the clutch cam 149 to operate it. The main clutch 43 is turned off. Until the main clutch 43 is operated, the right arm 146R is not rotated because the elongated hole 144a is provided at the lower end of the operating rod 144 even if the left and right brake operating arm 143 is rotated upward.

  When the operator further depresses the pedal 140 after the main clutch 43 is turned off, the left and right brake operating arms 143 are further moved upward and rotated, and the right arm 146R is rotated by the operating rod 144. The left and right rear wheel brakes are activated. At this time, after the main clutch 43 is disengaged, the main clutch operation cam roller 148a only rolls the linear portion 149b of the lower surface 149a of the clutch cam 149 and hardly moves the clutch cam 149 upward. Therefore, the force that the operator depresses the pedal 140 is only lightly operated by first disengaging the main clutch 43 and only operating the left and right rear wheel brakes after the main clutch 43 is disengaged. The stepping force is good and the operability is very good.

  The seedling planting device 3 includes a transmission case 162 that also serves as a frame, a seedling mounting base 163 that feeds the seedlings to the seedling outlets 163a of each row by placing the seedlings and reciprocating left and right, and the seedling outlets 163a,. , Etc. for planting seedlings supplied to the farm.

  The fertilizer applicator 4 feeds the fertilizer in the fertilizer tank 46 downward by a fixed amount by the fertilizer feed section 48,..., Transfers the fed fertilizer to the fertilizer guide 154,... Through the fertilizer hose 153,. It is made to drop in the fertilization groove formed in the side part vicinity of a seedling planting strip by the groove production body 159 provided in the front side of 154.

  As shown in the side view of FIG. 20, a part of the fertilization hose 153 may be composed of a rigid hose 153b made of synthetic resin. An air vent 153b1 is provided upward and integrally with the rigid hose 153b. The air vent 153b1 is provided with a lid 153b2, and when the air pressure in the fertilizer hose 153 exceeds a predetermined value, the lid 153b2 is opened and the air in the fertilizer hose 153 is released to the outside. Alternatively, even if the fertilizer is clogged in the fertilizer hose 153, the flow of air in the fertilizer hose 153 is prevented so that the fertilizer clogging is prevented. The rigid hose 153b is configured to be short and is disposed higher than the lower end of the seedling feeding belt 185, and is a flexible rubber capable of extending and contracting from the lower end of the rigid hose 153b to the upper end of the fertilization guide 154. The hose 153a is connected. The lower part of the rubber hose 153c is provided with a bellows-like hose part, and the bellows-like hose part can be expanded and contracted. Therefore, by arranging the rigid hose 153b above the lower end of the seedling feeding belt 185, the rubber hose 153c can be set longer and a sufficient amount of bending can be obtained. It is possible to follow the movement of the fertilizer guide 154 due to the movement, and consequently, it is possible to prevent clogging of the fertilizer due to the hose 153 being bent at a steep angle at one place. Further, since the bellows-like hose portion and the hose portion connected to the upper side thereof are constituted by the integral rubber hose 153c, the number of parts can be reduced and the cost can be reduced.

  Conventionally, since the bellows-like hose and the flexible hose part connected to the upper side are configured separately, only the bellows-like hose is easily bent, and the hose is bent at a steep angle at one place. As a result, fertilizer clogging may occur, and the number of parts increases, resulting in an increase in cost. In addition, the lower end of the rigid hose with the air vent is arranged at a relatively lower position, and accordingly, the length of the bellows-like hose and the flexible hose portion connected to the upper side is shortened, and a sufficient amount of bending is achieved. There was a possibility that it could not be obtained.

  Further, as another configuration, the rigid hose 153b can be disposed above the upper end of the rigid hose 153b so as to be positioned higher than the upper end of the seedling feeding belt 185. Thereby, there is no possibility that the upper flexible hose 153a connected to the upper end of the rigid hose 153b contacts the seedling feeding belt 185, and the operation of the seedling feeding belt 185 is not hindered.

  Conventionally, the upper end of the rigid hose is lower than the upper end of the seedling feeding belt, and the fertilizer transfer path composed of various hoses is set closest to the upper end of the seedling feeding belt, and the fertilizer on the traveling vehicle body side The flexible hose on the upper side provided long from the vicinity of the feeding device to the seedling planting device side also has a large amount of deflection, so there is a possibility that the flexible hose on the upper side may contact the seedling feeding belt. May interfere with the operation of the.

FIG. 21 is a hydraulic circuit diagram of the entire hydraulic device of the agricultural machine.
Pressure oil delivered from a hydraulic pump 13 which is a pressure oil supply source for delivering oil from an oil tank (mission case) 11 is a steering hydraulic circuit (steering valve unit) 62 for operating a power steering cylinder 59 (59a, 59b) and a seedling. It is supplied to an elevating hydraulic circuit (elevating valve unit) 67 for operating the elevating cylinder 160 of the planting device 3 and the HST 5. The steering hydraulic circuit 62 is composed of a directional control valve 68 that is interlocked with the operation of the steering handle 16. When the steering handle 16 is in the neutral position, the pressure oil supplied to the steering hydraulic circuit 62 is supplied. When the steering handle 16 is turned to the right from the neutral position, oil with a flow rate corresponding to the operation amount is supplied to the left cylinder chamber 59a of the power steering cylinder 59, and the steering handle 16 is neutralized. When it is turned to the left from the position, pressure oil having a flow rate corresponding to the operation amount is supplied to the right cylinder chamber 59b of the power steering cylinder 59.

When the discharge amount of the pump 13 is equal to or greater than a predetermined amount, the pressure control valve 75 is opened, and the excess hydraulic oil is not passed through the steering hydraulic circuit 62 and is used for the lifting cylinder operation of the seedling planting device 3. 67.
In the lift hydraulic circuit 67, when the amount of oil flowing through the priority valve 78 increases from the illustrated state, the spool in the valve 78 shifts to the right side of the drawing and flows into the lift valve 80 provided with the lift lever 79. The pressure oil that has flowed into the lift valve 80 changes its spool position by the lift lever 79 and is sent to the seedling planting device 3 side or returned to the valve 78 side.

When the spool of the valve 84 moves to the left from the illustrated state, the pressure oil that has passed through the lift valve 80 and flows into the drop restriction valve 84 having the drop restriction lever 81 activates the lift cylinder 160.
The priority valve 78 is a 2-position 3-port pilot valve. When the engine 12 has a low rotation speed and the discharge amount of the pump 13 is small, the priority valve 78 is in the position shown in FIG. The On the contrary, during normal operation in which the rotational speed of the engine 12 is increased to some extent and the discharge amount of the pump 13 is increased, the spool is shifted to the right side of the drawing and is divided and supplied to the two ports of the lift valve 80. Thereby, at the time of ascent in the automatic height control of the seedling planting device 3, the elevating valve 80 is switched to the second position from the right side of the drawing, and the ascending operation is performed with the oil amount from one of the two ports divided into two ports, Obtain a suitable climb rate. When the seedling planting device 3 is manually lifted, the lift valve 80 is switched to the position on the right end of the drawing, the amount of oil from the two divided ports is merged and supplied to the lift cylinder 160, and the lifting speed is increased.

  At this time, since the spool is provided with a return side oil passage having a throttle 80a at the right end position of the lift valve 80 in the drawing, oil supply to the HST 5 is interrupted via the throttle 80a (return side oil passage). There is nothing. The return oil from the lift valve 80 and the hydraulic pressure escaping from the pressure control valve 96 are supplied to the HST 5 via the oil filter 97.

  Since the lowering restricting valve 84 includes the one-way valve 84a, the oil in the elevating cylinder 160 is not drained unless the lever 81 is operated.

  The hydraulic circuit of the present embodiment shown in FIG. 21 includes a steering hydraulic circuit 62 for operating the power steering cylinder 59, an operating hydraulic circuit 67 for the lifting cylinder 160 of the seedling planting device 3 and the HST 5 connected in series, and Since they are arranged close to each other, the discharge pressure of the hydraulic pump 13 can be reduced as compared with the case where these hydraulic circuits 62, 67, 5 are connected in parallel.

  22 and 23 show a side view and a plan view of the operation drive mechanism 173. The seedling planting device 3 is transmitted from the engine 12 through the PTO conduction shaft 167, and the transmission of the PTO conduction shaft 167 is performed. This is done via a PTO clutch 170 that turns on and off. The HST 5 is shifted by a shift lever 110 provided on the right side of the cockpit 20. When the speed change lever 110 is operated to the neutral position, the traveling transmission is stopped, the speed change lever 110 is moved forward to the high speed state by operating the gear shift lever 110 to the front, and the speed is changed to the reverse high speed state by operating from the neutral position to the rear side. The forward / reverse speed can be increased or decreased according to the inclination angle of the lever 110.

  FIG. 25 shows a power transmission path to the PTO, FIG. 26 shows a schematic configuration of the control device 215, and FIG. 22 shows a side view of the operation drive mechanism 173. As shown in FIG. 22, the lift valve 80 of the lift valve unit 67 that extends and contracts the lift cylinder 160 (FIG. 21) and the PTO clutch 170 include an operation drive mechanism 173 by an actuator 172 made of an electric motor or a stepping motor. Are linked through. The actuator 172 includes a lift switch 103 for moving the seedling planting device 3 up and down on the grip portion 102 of the speed change lever 110 shown in FIG. 24 (FIG. 24A is a front view and FIG. 24B is a side view). The work switch 104 and the like are turned on and off by the output from the controller 115.

  As shown in FIG. 24, a lifting switch 103 of the seedling planting device 3 and a work switch 104 for performing work transmission are provided on the grip portion 102 of the speed change lever 110, and the raising and lowering of the seedling planting device 3 from the vehicle speed shift. In a series of operations over work transmission, the grip portion 102 does not need to be held again, or a lifting operation or a planting transmission operation is performed while performing a speed change operation, and a quick operation is performed to improve operability. be able to.

  Further, by operating the speed change lever 110, the vehicle speed of the work implement can be changed by operating the HST5. The operator operates the ascending switch 103U or the descending switch 103D of the elevating switch 103 while holding the grip portion 102 of the speed change lever 110 to output the actuator 172, and via the operation driving mechanism 173. The lift cylinder 160 can be expanded and contracted by switching the lift valve 80, and the seedling planting device 3 can be lifted and lowered with respect to the main frame 10. Further, when the work switch 104 is operated, the actuator 172 is operated and the PTO clutch 170 is turned on and off via the operation drive mechanism 173, so that the seedling planting device 3 can be transmitted. The work switch 104 can be configured independently of the lowering switch 103D of the raising / lowering switch 103, but in the illustrated example, the actuator 172 and the operation driving mechanism 173 are shared with the interlocking of the raising / lowering valve 80. This work switch 104 can also be shared with the lowering switch 103D. In this case, when the seedling planting device 3 is lowered to a certain working position by detecting the ground contact state by the upper and lower sides of the sensor float 165, the PTO clutch 170 can be operated to perform seedling planting work. The configuration.

  The raising / lowering switch 103 has an ascending button 156 that switches between rising and stopping each time it is pressed, and a lowering button 157 that switches between descending and descending every time it is pressed, and each time the ascending button 156 and the descending button 157 are pressed. These operations are switched to ascending and descending stop, and descending and descending stop, respectively, so that these operations can be facilitated accurately. Further, the ascending and descending strokes can be maintained for a long time, and the ascending and descending can be performed quickly. Here, the ascending switch 103U is turned on by pushing the ascending button 156, and the descending switch 103D is turned on by pushing the descending button 157. Each time the lift button 156 is pushed in, the lift valve 160 is switched via the actuator 172 or the operation drive mechanism 173 to extend the lift cylinder 160, and the seedling planting device 3 is lifted or switched to stop the lift. it can. During this raising operation, the lift valve 80 is held in the raised position, and the seedling planting device 3 is continuously raised. Further, every time the lowering button 157 is pushed in, the lowering switch 103D is turned ON to similarly switch between the lowering of the seedling planting device 3 and the lowering stop. At the time of the descent, the seedling planting device 3 is continuously lowered.

  Further, the lowering button 157 can switch on / off of the work transmission by lowering the seedling planting device 3 to the working position, and the lowering button 157 lowers the seedling planting device 3 as described above. However, when the seedling planting device 3 reaches the work position, the work transmission to the seedling planting device 3 is switched between on and off every time the lowering button 157 is pressed, and the work is performed. Can be stopped. It is possible to switch between work transmission and this transmission stop with the same lowering button 157 for lowering the seedling planting device 3, and operability can be improved.

  Further, the protruding amount of the ascending button 156 and the descending button 157 is set to be different from each other, and the protruding amount of the ascending button 156 and the descending button 157 at the grip portion 102 is varied so that the operation feeling between the buttons is different. However, it is possible to improve the distinction between the up button 156 and the down button 157 and to reduce erroneous operations. Further, the ascending button 156 is positioned on the front end side of the grip portion 102, and the descending button 157 is disposed below the ascending button 156, and the ascending button 156 is disposed on the distal end side of the grip portion 102 of the transmission lever 110. Since the lowering button 157 is provided on the lower side, the selection of the operation is performed accurately corresponding to the same side as the raising and lowering direction of the seedling planting device 3, and the number of erroneous operations can be reduced.

  In addition, the grip portion 102 has a lowering button 158 that descends by pressing and stops descending when the pressing is released. The grip portion 102 of the speed change lever 110 has a lowering dedicated to lowering separately from the lowering button 157. By having the button 158, the position of the start of the planting device 3 can be lowered or stopped by pressing the lowering button 158 and releasing the pressing when the work is started at the heel. Positioning can be facilitated and operability can be improved.

  The lowering button 158 is arranged at the rear of the ascending button 156 and the lowering button 157, and the lowering button 158 that is less frequently used is arranged at the rear of the raising button 156 and the lowering button 157. Misoperations can be reduced. Here, each of the up button 156, the down button 157, and the down button 158 is arranged on the thumb side of the grip portion 102. However, the up button 156, the down button 157, and the down button 158 are arranged on the opposite side of the child finger and the ring finger side. It can also be configured to be operable. Also, the up button 156 and the down button 157 can be provided on the thumb side, and the down button 158 can be provided on the opposite side. Moreover, in order to make the sense of fingertip contact of each button 156, 157, 158 different, the outer shape and the uneven shape of the contact surface can be made different.

  As shown in FIG. 22 (side view of the operation drive mechanism 173) and FIG. 23 (front view of the operation drive mechanism 173), the rack gear 191 meshing with the pinion 190 as the operation drive mechanism 173 is electrically driven by the actuator (motor) 172. It is pivotally supported around a shaft 195 provided on a bracket 192 which is a component integral with the airframe. Further, a positioning cam 196 is rotatably provided on the shaft 195 as shown in FIG. The cam roller 198 of the swing arm 197 is slidably contacted with the outer periphery of the positioning cam 196, and the rotational position of the positioning cam 196 can be locked or unlocked. . The swing arm 197 is supported by a support shaft 199, and a spring 200 ejects a cam roller 198 toward the positioning cam 196. The shaft 195 is integrally provided with a clutch cam arm 201, and the clutch cam arm 201 presses the cam of the PTO clutch 170 for transmission to the seedling planting device 3 to cause the PTO clutch 170 to be turned on and off. Can do. In addition, a spool of the lift valve 80 is connected to a positioning cam 196 that is actuated by the actuator (motor) 172 electrically. The spool of the lift valve 80 is pressed to switch the lift link 160 from the neutral position to the lowered position or the raised position. It can be operated to.

  Between the arm 203 provided integrally with the shaft 195 and the arm 204 integrated with the positioning cam 196, a pin 205 constituting the positioning floating mechanism 219 and a long hole 206 for fitting the pin 205 are provided. A pin 205 is fixed to the arm 204, and a long hole 206 is formed in the arm 203. The relative position between the rack gear 194 and the positioning cam 196 on the shaft 195 is engaged through a floating gap formed by the pin 205 and the long hole 206 between the arms 204 and 203, so that the positioning cam for the rack gear 191 is engaged. The rotational position of 196 can be moved back and forth, and the positioning cam 196 and the cam roller 198 are engaged at a fixed position. For this reason, the position of the seedling raising / lowering lever 79 is locked in place by the positioning cam 196 and the cam roller 198.

  At this time, since the cam roller 198 acting on the positioning cam 196 is pressed by the elastic force of the spring 200, the positioning cam 196 driven by the actuator (motor) 172 to a certain position is engaged with the pin 205. Since it is rotated in advance by the backlash of the long hole 206, the positioning cam 196 is positioned quickly, and hunting can be prevented more effectively. The driving of the operation mechanism by the actuator (motor) 172 is performed by an output from the controller 215.

  As shown in FIG. 26, operation switches, sensor switches, control programs, and the like are input to the input side of the control device 215. The operation switches include the elevating switch 103, the work switch 104, the lowering switch 158, the switch 208 by operating the finger lever 171, the engine switch 210, and the like. And a grounding sensor comprising a sensor float (center float) 165 for detecting that it is in the seedling planting position, a lift link sensor 169 for detecting the lift position of the seedling planting device 3, and backward control when the backlift on / off lever is engaged There is a case where the reverse position sensor 209 is included. In addition, an actuator sensor 211 that detects the rotation position of the rack gear 191 is attached to the bracket 192 as the operation position. When the tip of the telescopic arm 213 rotated integrally with the rack gear 191 is engaged with the pin groove of the sensor arm 214 of the actuator sensor 211, the arm 213 is rotated together with the rack gear 191. The sensor arm 214 to be combined is rotated, and the actuator sensor 211 detects the rotation angle of the rack gear 191.

  The left and right drawing markers 223 (FIG. 1) are provided at both right and left ends of the transmission case 162 of the seedling planting device 3 so as to be able to stand upside down and are urged to fall by a spring (not shown).

  27 and the front view of FIG. 28, when the marker wires 231L and 231R that are interlocked with the raising and lowering operation of the seedling planting device 3 are drawn as shown in the front view of the drawing marker driving device 232, the drawing markers 223L and 223R are drawn. When the marker wires 231L and 231R are returned, the draw markers 223L and 223R fall over due to the tension of the spring. The drawing markers 223L and 223R are not drawn to the topsoil portion of the field in the standing posture, and are drawn to the topsoil portion of the field in the fall posture.

Next, the operation mechanism of the drawing marker 223 will be described.
Although not shown, the drawing marker driving device is provided at the center of the plate spanned by a support member (not shown) of the seedling mounting table 163 provided on the sensor float 165 and the side float 166 as shown in FIGS. It is done.

  The marker driving device is provided with a disk 236 provided at the periphery with a motor 235 supported on the lower side of the support plate 233 and a gear 236a that meshes with a gear 235a provided on a rotating shaft portion of the motor 235. . The rotary shaft 236b of the disc 236 is provided with a projection 239a on the surface side of the support plate 233 on the surface side of the support plate 233 on the periphery of the central axis every 90 degrees from the center axis for operating the switch 237 for detecting the position of the cam 234. Further, the cam 234 that passes through the switch plate 239 and the support plate 233 and is provided on the surface side opposite to the support plate 233 and the rotary shaft of the potentiometer detection pin support plate 238 provided in parallel with the cam 234 are also used. Since the switch 237 for detecting the position of the cam 234 is turned on every 90 degrees of rotation of the disk 239 with projections, the marker 223 can be controlled to the left, left, right, and non-acting states. .

  The cam 234 is configured so that the rotatable rollers 240R and 240L provided at the ends on the base side of the pair of L-shaped arms 230R and 230L for driving the pair of markers 223R and 223L are in contact with the side surfaces thereof. The pair of L-shaped arms 230 </ b> R and 230 </ b> L are supported so as to be rotatable about rotation shafts 230 </ b> Ra and 230 </ b> La provided on the support plate 233. The left and right marker driving wires 231R and 231L are connected to the distal ends of the pair of L-shaped arms 230R and 230L, and the ends of the pair of L-shaped arms 230R and 230L are supported by the support plate 233. The springs 242R and 242L are always urged toward the sides where the tip portions approach each other. When the tip ends of the pair of L-shaped arms 230R and 230L are biased toward the side approaching each other, the marker 223 is in an upright state and is not drawn on the field.

  When the pair of L-shaped arms 230R or 230L is rotated by the motor 235 and the roller 240R or 240L comes into contact with the large diameter portion of the cam 234, the movement of the pair of L-shaped arms 230R or 230L loosens the wires 231R and 231L. Then, the marker 223R or 223L falls over to the line drawing position of the field and performs line drawing. Further, when the roller 240R or 240L contacts the small diameter portion of the cam 234 by the rotation of the motor 235, the wires 231R and 231L are pulled by the movement of the pair of L-shaped arms 230R or 230L, and the markers 223R or 223L stand up. .

  A pin 238 a is fixed to the potentiometer detection pin support plate 238, the rotation shaft of the clamping tool 242 sandwiching the pin 238 a is provided on the surface portion of the potentiometer 243, and the potentiometer detection pin support plate 238 drives the motor 235. When rotating with force, the pin holder 242 rotates, and the degree of rotation can be detected by the potentiometer 243. The potentiometer 243 is fixed to a support base 245 on the support plate 233.

  In the marker driving device 232 having the above-described configuration, the geared disk 236 is rotated by the rotation of the motor 235, and the cam 234 that rotates integrally with the disk 236 moves to a position (marker standing position) that is initially close to each other. A pair of L-shaped arms 230R and 230L swing to drive the wires 231R and 231L. If the rotation of the motor 235 is, for example, a right rotation in the figure, the left marker L-shaped arm 230L swings to cause the left marker 223L to fall. At this time, the L-shaped arm 230R for the right marker maintains the initial position based on the shape of the cam 234. When the protrusion 239a of the disk 239 with protrusions hits the switch 237 by the rotation of the motor 235, the rotation of the motor 235 stops and the left and right markers are held at the respective positions.

  When the motor 235 rotates in the direction opposite to that described above, the L marker arm 230R for the right marker swings to the left (dotted line side), the right marker 223R falls, and the left marker 223L is in an upright state.

  The present invention can be applied to a working machine such as a riding rice transplanter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view showing an eight-row planting type rice transplanter that is an embodiment of the present invention. It is a side view of the spring type planting raising / lowering adjustment tool of the lift cylinder of the riding type rice transplanter shown in FIG. It is a whole top view of the riding type rice transplanter shown in FIG. It is a side view of the traveling vehicle body of the Example of this invention. It is a top view of the traveling vehicle body of the Example of this invention. It is a rear view of the traveling vehicle body of the Example of this invention. It is a schematic plan view which shows the transmission structure of the traveling vehicle of the riding type rice transplanter shown in FIG. It is a rear view of the principal part of the power transmission on / off apparatus to the heel clutch and seedling feed belt of embodiment of this invention. It is a block diagram of the connection part of the saddle clutch of embodiment of this invention, and the cable for the action | operation. It is a block diagram of the connection part of the seedling feed belt of embodiment of this invention, and the cable for the action | operation. It is a principal part rear view of the seedling planting tool part of embodiment of this invention. It is a side view which shows the interlocking mechanism of the sensor float of the riding type rice transplanter shown in FIG. It is a principal part top view of FIG. It is a top view which shows the operation structure of the main clutch and rear-wheel brake of the riding type rice transplanter shown in FIG. It is a perspective view which shows the steering structure of the left-right front wheel of the riding type rice transplanter shown in FIG. It is a perspective view which shows the operation structure of the hydraulic transmission HST of the riding type rice transplanter shown in FIG. It is a front view which shows cooperation of the operation member of the handle post part of the riding type rice transplanter shown in FIG. It is a perspective view which shows cooperation of the operation member of the handle post part of the riding type rice transplanter shown in FIG. It is a top view of the lever guide of the transmission lever of the riding type rice transplanter shown in FIG. It is a principal part side view of the vicinity of the fertilization hose of the riding type rice transplanter shown in FIG. FIG. 2 is a hydraulic circuit diagram of the farm seedling planting device in FIG. 1. It is a side view of the operation drive mechanism part of the riding type rice transplanter shown in FIG. It is a top view of the operation drive mechanism part of the riding type rice transplanter shown in FIG. It is a figure which shows the switch provided in the transmission lever of the riding type rice transplanter shown in FIG. FIG. 2 is a power transmission path diagram to wheels and a PTO of the riding type rice transplanter shown in FIG. 1. It is a one part control circuit block diagram of the riding type rice transplanter shown in FIG. It is a top view of the marker drive device of an embodiment of the invention. It is a front view of the marker drive device of an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling vehicle 2 Elevating link apparatus 2a1, 2a2, 2b Parallel link member 3 Seedling planting apparatus 4 Fertilizer 5 HST 6 Front wheel 7 Rear wheel 8 Upper connection plate 9 Floor frame 10 Main frame 11 Mission case 12 Engine 13 Hydraulic pump 14 Steering post 15 Lifting link base frame 16 Steering handle 17 Operation panel 18 Connection frame 19 Step floor 20 Pilot seat 21 Air cleaner 22 Front wheel support case 23 Rolling rod 24 Rear wheel support case 25 Rolling shaft 26 Support frame 27 Rear wheel rolling frame 28 Auxiliary step Stay 29 Fuel tank 30 Fuel tank mounting frame 31, 33 Belt 32 Counter shaft 34 Mission input shaft 35 Input shaft 36 Output shaft 37 Standing frame 38 Rear step frame 39 Connecting plate 40 Casing 41 Transfer member 42 Front wheel axle 43 Main clutch 44 Radiator 45 Battery 46 Fertilizer tank 47 Fixing member 48 for switching operation Feeding device 49 Front wheel axle fixing portion 55 Bumper frame 56, 57 Shifter 58 Arm with projection 58a Projection 59 Power steering cylinder 60 Rear axle 61 Front axle 62 Steering valve unit 67 Elevating valve unit 68 Direction control valve 63, 65 Container 64, 66 Vertical axis 69, 70, 73, 74 Claw 71, 72 Differential lock member 75 Pressure control valve 76 Side clutch shaft 77 Output shaft 78 Priority valve 79 Lifting lever 80 Lifting valve 81 Lowering control lever 84 Lowering control valve 85 Shifter 85J Left and right shifter 86I Left and right clutch operating arm 86J Left Brake operation arm 89 Left and right rear wheel transmission shaft 90 Change lever 91 Differential lock lever 91 'Differential lock pedal 96 Pressure control valve 97 Oil filter 98 Lever guide 99 Engine cover 102 Grip portion 103 Lift switch 104 Work switch 110 Shift lever 111 Shaft 112 Operation lever base 112a pin 113 shaft 114 rod 115 positioning shaft 116 arm 117 cam plate 117F, 117N, 117R arc groove 118 spring 119 position roller 120 HST operation arm 121 trunnion shaft 122 trunnion operation arm 123 rod 130 throttle lever 131 operation wire 132 engagement member 133 Arm 134 Wire 135 Accelerator interlocking arm 135a Hook part 140 Pedal 140a Boss part 140b Split pin 142 Rotating support shaft 143 Left and right brake operation arm 144 Operation rod 144a Long hole 145 Counter shaft 146 L-shaped arm 147 Connection rod 148 Arm 148a Main clutch operation cam roller 149 Clutch cam 150 Operation rod 151 Clutch shifter 152 Arm 153 Fertilization hose 154 Guide 155 Lift link sensor 156 Raising button 157 Lowering button 158 Lowering button 159 Groove body 160 Hydraulic cylinder 160a Cylinder rod 161 Spring type planting lifting adjustment tool 162 Planting transmission case 163 Seedling stand 164 Seedling planting tool 165 Sensor float 166 Side float 167 PTO transmission shaft 168 Fertilization drive case 169 Lift link sensor 170 PTO clutch 171 Finger lever 172 Actuator 1 3 Operation drive mechanism 174 Output shaft 175 Pitman arm 176 Left and right rod 177 Actuator roller 178 Notch 179 Driven body 180 Left and right rod 182 Left and right sensor push piece 183 Auto lift switch 185 Seedling feed belt 186 畦 Clutch 187 Drive side clutch body 188 Passive body Clutch body 189 Cable 190 Pinion 191 Rack gear 192 Bracket 194 Rack gear 195 Shaft 196 Positioning cam 197 Swing arm 198 Cam roller 199 Support shaft 200 Spring 201 Arm 202 Valve arm 203, 204 Arm 205 Pin 206 Long hole 207 Angle of attack sensor 208 Finger gap lever Switch 209 reverse position sensor 210 engine switch 219 idler mechanism 211 actuator sensor 212 swing arm 213 214 Sensor arm 215 Control unit 216 Clutch operation unit 217 Seedling feed belt operating cable 218 Spring 220 Sprocket 221 Washer 223 Drawing marker 224 Spring 225 Chain 227 Shifter arm 228 Seedling feed drive roller 229 Seedling feed driven roller 230 L-shaped arm 230Ra, 230La Rotating shaft 231 Marker wire 232 Drawing marker driving device 233 Support plate 234 Cam 235 Motor 235a, 236a Gear 236 Disc 236b Rotating shaft 237 Switch 238 Potentiometer detection pin support plate 238a Pin 239 Protrusion disc 239a Protrusion 240 Roller 242 Clamp 243 Potentiometer 245 Support base 246 Seedling planting operation gear case 247 Lead cam shaft 248 Lead cam 24 Vertical feed transmission shaft 252 Spring 260 Planting depth adjusting pipe 261 Float support arm 262 Angle of attack interlocking arm 264 Angle of attack interlocking rod 265, 266 Parallel link 267 Angle of attack sensor mounting portion 268 Angle of attack sensor base plate 269 Float arm 270 Float link 273 Spring 274 Hook 276 Pin

Claims (1)

In the seedling transplanting machine in which the seedling planting device 3 is connected to the rear portion of the traveling vehicle body via the lifting link device 2,
The lifting / lowering link device 2 is supported by a traveling vehicle main body at a front end portion and is provided in a rear-upward manner, and a lift cylinder 160 provided with a spring-type planting lifting / lowering adjustment tool 161 at a rear end portion, and a traveling vehicle main body. The lifted link base frame 15, the pair of upper and lower parallel link members 2 rotatably supported by the lift link base frame 15, and the lower link member 2a2 of the pair of upper and lower parallel link members 2a1 and 2a2. With an integral arm 58,
The upper end 58a of the arm 58 has an arrangement relationship that abuts against the adjustment tool 161 of the lift cylinder 160 at a position above the upper link member 2a1 at least when the seedling planting device 3 is grounded and in an unloaded state. A seedling transplanter characterized by that.

Images