JP2011030436A - Seedling tank moving device of seedling transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in extending/contracting boots for covering the outer circumference of a lead cam shaft for reciprocatively moving a seedling tank of a seedling planting machine in a right and left direction, suction and discharge of muddy water are likely to occur by suction and exhaust action of air in boot chambers, the muddy water to be sucked and discharged is mixed with a lubricating oil or the like in the boot chambers and the lubricating oil is discharged to the surface of a paddy field, which is often contaminated. <P>SOLUTION: The outer circumferential part of the lead cam shaft 3 that is fitted with a lead cam 2 integrally attached to the seedling tank 1 and reciprocatively moved along the direction of seedling tank width is equipped with the lead cam 2 fitted with and guided by the lead cam shaft 3 and a pair of right and left extending/contracting boots 4 and 5 for covering both end parts of the lead cam shaft 3 between both end parts, respectively, and the boot chambers 6 and 7 in the pair of the right and left extending/contracting boots 4 and 5 freely communicate with each other so as to perform free ventilation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seedling tank moving device of a seedling planting machine that moves and guides a lead cam by rotation of a lead cam shaft and moves a seedling tank connected to the lead cam in a lateral direction with respect to an operation position of a seedling planting claw. .

  By rotating the lead cam shaft, the lead cam fitted to the lead cam shaft is reciprocated in the axial direction, and the seed tank is reciprocated over one mat seedling width region. A technique for covering the expansion / contraction boot (for example, Patent Document 1) is known.

JP-A-58-88257 (first page, FIG. 1).

  In the seedling planting machine, there are many seedling planting operations by paddy field travel, and the seed cam and the lead cam shaft for reciprocating the seedling tank in the left and right direction move to a position close to the seedling planting soil surface. The expansion / contraction action of the expansion / contraction boot that covers the outer periphery of the shaft makes it easy to inhale and exhaust muddy water due to the intake and exhaust action into the boot chamber. In many cases, the lubricating oil is discharged and contaminated.

  According to the first aspect of the present invention, a lead cam 2 provided integrally with the seedling tank 1 is fitted and fitted to the lead cam shaft 3 on the outer periphery of the lead cam shaft 3 that reciprocates along the direction of the seedling tank width. A pair of left and right expansion / contraction boots 4 and 5 are provided so as to cover between the lead cam 2 to be guided and both ends of the lead cam shaft 3, and the boot chambers 6 and 7 in the pair of right and left expansion / contraction boots 4 and 5 are provided. It is set as the structure of the seedling tank moving apparatus of the seedling planting machine characterized by communicating freely. When the lead cam shaft 3 is rotated during seedling planting, the lead cam 2 fitted to the lead cam shaft 3 is reciprocated along the axial direction, and the seed tank 1 connected to the lead cam 2 is moved in the tank width direction. The seedling separation part at the front edge of the seedling tank 1 is fed out and supplied to a seedling planting claw that is operated at a fixed position to perform seedling planting operation. In such a reciprocating left and right movement of the lead cam 2, the expansion / contraction boots 4 and 5 disposed on the left and right sides of the lead cam 2 are expanded and contracted, and the boot chambers 6 and 7 covering the outer peripheral portion of the lead cam shaft 3 are expanded and contracted. When the lead cam 2 moves to the left side with respect to the lead cam shaft 3, the left boot chamber 6 is contracted, the right boot chamber 7 is expanded, and when the lead cam 2 moves to the right side, Conversely, the right boot chamber 7 is contracted and the left boot chamber 6 is expanded. In such expansion and contraction of the left and right boot chambers 6 and 7, the communication between the boot chambers 6 and 7 is communicated between the high pressure side and the low pressure side according to the air pressure difference. It flows in and does not become the resistance of the expansion / contraction operation of the expansion / contraction boots 4, 5, and smooth expansion / contraction is performed, and the suction of muddy water from the outside is prevented, and the lead cam shaft 3 slides with the lead cam 2 part and the like. A lubricating oil surface is formed on the dynamic friction portion, and the seedling tank 1 is moved smoothly.

  According to the second aspect of the present invention, lubrication is performed to lubricate the connecting and sliding portion of the lead cam 2 with respect to the lead cam shaft 3 to the communication pipe 8 communicating between the boot chambers 6 and 7 between the left and right expansion / contraction boots 4 and 5. A fueling device 9 is provided. As described above, the right and left expansion and contraction boots 4 and 5 expand and contract in the communication pipe 8, whereby the air in the left and right boot chambers 6 and 7 flows to reduce the expansion and contraction resistance of the expansion and contraction boots 4 and 5. At the same time, since the lubricating oil supply device 9 communicates with the communication pipe 8, the lubricating oil supplied from the lubricating oil supply device 9 is supplied to the lead cam shaft 3 and the lead cam 2 of the left and right boot chambers 6, 7. Lubricate the fitting sliding part.

  According to a third aspect of the present invention, the lubricating oil supply device 9 supplies the lubricating oil of the seedling planting transmission device 11 that transmits the lead cam shaft 3 and the seedling planting device 10. The seedling planting device 10 causes the seedling tank 1 to reciprocate left and right by driving the lead cam 2 or the lead cam shaft 3 by the transmission of the seedling planting transmission device 11 to feed and feed the seedlings, The seedlings fed from the seedling tank 1 are separated and held and planted on the soil surface. The lubricating oil supply device 9 supplies a part of the lubricating oil that performs the lubricating action of the seedling transmission device 11 to the left and right boot chambers 6 and 7 so that the lead cam shaft 3 and the lead cam 2 slide. Lubricate the part.

  According to a fourth aspect of the present invention, a convex portion 14 that forms a gap 13 between the folding overlapping surfaces 12 is formed between the folding overlapping surfaces 12 on the bellows outer periphery of the expansion / contraction boots 4 and 5. The expansion / contraction boots 4 and 5 expand and contract the boot chambers 6 and 7 by forming a bellows-shaped folding overlapping surface 12 and expanding and contracting the gap 13 between the adjacent folding overlapping surfaces 12. When the boot chambers 6 and 7 are contracted, the folding overlap surfaces 12 are compressed to be folded and overlapped with each other, and the convex portions 14 are held between the folding overlap surfaces 12. By interposing the convex portion 14 between the folding overlapping surfaces 12 of the expansion / contraction boots 4, 5, the close contact between the folding overlapping surfaces 12 is prevented. Make it easier to spread the gap.

  According to the first aspect of the present invention, when the expansion and contraction boot chambers 4 and 5 on both the left and right sides of the lead cam shaft 3 expand and contract, the air in the left and right boot chambers 6 and 7 moves through the mutual communication portion, Smooth lubrication and expansion / contraction operation of 4 and 5 are maintained, intake / exhaust from the outside, suction / discharge of muddy water, and the like are eliminated, and the lubricating oil is not leaked to the surface of the paddy field and contaminated.

  According to the second aspect of the present invention, lubricating oil can be supplied using the communication pipe 8 that guides the flow of pressure air between the left and right expansion / contraction boots 4, 5, and the left and right boot chambers 6, 7 can be supplied. Lubricating oil can be supplied by the common lubricating oil supply device 9, and weight reduction and cost reduction can be achieved. Further, since the lubricating oil can be supplied using the pressure change of the left and right boot chambers 6 and 7, the lubricating oil supply device 9 can be of a simple configuration.

  In the invention according to claim 3, the lubricating oil of the seedling transmission device 11 can be shared as the lubricating oil of the lead cam shaft 3 and the lead cam 2, and the lubricating oil supply device 9 can be made simpler, and the weight can be reduced. In addition, the cost can be reduced.

  The invention according to claim 4 can reduce the change in expansion / contraction resistance due to the close contact between the folding overlapping surfaces 12 of the expansion / contraction boots 4, 5. It is possible to prevent the intrusion of water and to operate the lead cam smoothly.

The top view of a lead cam shaft part. The side view of a seedling transplanter. The plan view. The front view of a leaf cam shaft part. The cross-sectional view and side view of the expansion / contraction boot part. The perspective view of the rotor axial part of a seedling planting transmission case. The side view of a main transmission lever and a brake pedal part. The side view which shows the operating state of a working tool attachment socket part, and the front view of an attachment pin. The front view and the top view of the attachment socket part. The front view of a steering case part. The control block diagram of a wheel damper. The side view which shows the wheel damper example of the rear-wheel side. The enlarged side view which shows a part of example of a wheel damper on the rear wheel side.

  On the basis of the drawings, the raising / lowering seedling planting device 10 is connected to the rear side of the vehicle body 15 in the four-wheel-riding traveling form having the front wheel 23 and the rear wheel 24 via the raising / lowering link 25 in the form of a parallel link, Configure the seedling transplanter. The vehicle body 15 has a driver's seat 21, the engine 22 is mounted on the lower portion thereof, and the steering wheel 20 is provided on the steering post on the front portion of the floor 36, so that the front wheel 23 can be steered. From the engine 22, a hydraulic continuously variable transmission 41 on the lower side of the floor 36 is belt-transmitted to transmit the input shaft of the transmission case 42. The transmission device of the transmission case 42 transmits the front wheel 23 and transmits the rear wheel shaft 45 of the rear axle housing 44 via the rear wheel transmission shaft 43. Further, a PTO shaft extending backward from the mission case 42 is provided, and a fertilizer 38 mounted on the rear portion of the vehicle body 15 is transmitted from the PTO shaft, and the input shaft 26 of the seedling planting device 10 is transmitted. An auxiliary seedling mounting frame 37 is provided outside the floor 36, and a seedling tray that stores seedlings to be supplied to the seedling tank 1 of the seedling planting device 10 can be mounted. Further, the fertilizer applying device 38 is formed by the groove forming device 40 by guiding the fertilizer fed from the fertilizer hopper on the rear side of the driver's seat 21 to the groove forming portion 40 of the float 16 through the fertilizing hose 39. Fertilize in the fertilizer groove on the seedling soil surface.

  The seedling planting device 10 includes a multi-row planting seedling tank 1, a seedling planting nail 29 that separates and holds seedlings fed from the seedling tank 1, and is planted on a soil surface leveled by the float 16. Is done. The seedling planting transmission device 11 has a transmission case 30 as a main body, and a lead cam shaft 3 extending in the left and right lateral directions is pivotally supported on the front upper portion of the transmission case 30 to be rotationally transmitted from a part of the seedling planting transmission device 11 inside. The lead cam 2 is fitted in the center portion of the lead cam shaft 3 and a slider is fitted in a spiral guide groove formed in a reciprocating form. It is configured to reciprocate. At the rear end of the seedling planting transmission case 30, a seedling planting rotor 17 having a rotary shape having a seedling planting nail 29 is axially mounted and transmitted through the seedling planting transmission device 11, and each seedling planting nail 29 is attached to the seedling planting nail 29. The soil is leveled with a float 16 at the lower end by operating the planting trajectory line D in an elliptical shape when viewed from the side, allowing the seedling 31 at the lower end of the seedling tank 1 to pass through the seedling inlet 31 to separate and hold the seedling. Plant seedlings to a certain depth.

  The seedling tank 1 is provided with a number of mat seedlings according to the number of planting strips, and is fed out to the seedling outlet 31 at the lower end of the rear end. A partition 46 is provided for each width, and a feeding belt 28 is provided between the partitions 46. The lead cam 2 by the rotation of the lead cam shaft 3 and the seedling tank 1 which is laterally moved integrally by the lead cam 2 reciprocate to the left or right by a distance corresponding to one mat seedling width between the left and right partitions 46. To do. As a result, the mat seedlings 29 are planted while separating the mat seedlings by acting the seedling planting claws 29 while moving the front edge of the mat seedling between the partitions 46 laterally with respect to the seedling inlet 31. Further, when the seedling tank 1 moves to the left end or the right end and reaches the turn-back stroke, the belt 47 that spans the feeding belt 28 at the bottom of the seedling tank 1 by the crank arms 48 at both ends of the lead cam shaft 3. The one-way clutch and the seedling feeding arm 50 are engaged and rotated, and each feeding belt 28 is intermittently rotated by one frame to feed the mat seedling toward the seedling outlet 31 side.

  Between the rear wheel 24 and the float 16 of the seedling planting device 10, a scraping rotor 54 for scraping and leveling the soil surface is arranged to improve the leveling by each float 16. This scraper rotor 54 is provided along the front side of the seedling tank 1 support frame 34 that is configured on the front side of the seedling planting transmission case 30, so that the scraping frame 35 can be moved up and down via the upper and lower link arms 37. The scraping frame 35 can be moved up and down by operating the lever 51. The machining position of the machining rotor 54 can be changed according to the depth of the soil surface. Each of the scraper rotors 54 is arranged differently in the front-rear direction depending on the position of the float 16, but the scraper rotor 54 is connected to a part of the rear axle housing 44 that mounts the rear wheel shaft 45 via the interlocking shaft 32. The rotor shaft 33 is transmitted. Reference numeral 49 denotes a balance spring that suspends the front scraper rotor 54.

  Here, the seedling tank moving device of this seedling transplanter is fitted with a lead cam 2 provided integrally with the seedling tank 1, and the lead cam shaft 3 is provided on the outer periphery of the lead cam shaft 3 that reciprocates along the tank width direction. 3 is provided with a pair of left and right expansion / contraction boots 4 and 5 covering the lead cam 2 fitted and guided to both ends of the lead cam shaft 3, and a boot chamber 6 in the pair of right and left expansion / contraction boots 4 and 5, 7 The seedling tank moving device is configured to communicate with each other in a freely ventilating manner. When the lead cam shaft 3 is rotated during seedling planting, the lead cam 2 fitted to the lead cam shaft 3 is reciprocated along the axial direction, and the seed tank 1 connected to the lead cam 2 is moved in the tank width direction. The seedling separation part at the front edge of the seedling tank 1 is fed out and supplied to a seedling planting claw that is operated at a fixed position to perform seedling planting operation. In such a reciprocating left and right movement of the lead cam 2, the expansion / contraction boots 4 and 5 disposed on the left and right sides of the lead cam 2 are expanded and contracted, and the boot chambers 6 and 7 covering the outer peripheral portion of the lead cam shaft 3 are expanded and contracted. When the lead cam 2 moves to the left side with respect to the lead cam shaft 3, the left boot chamber 6 is contracted, the right boot chamber 7 is expanded, and when the lead cam 2 moves to the right side, Conversely, the right boot chamber 7 is contracted and the left boot chamber 6 is expanded. In such expansion and contraction of the left and right boot chambers 6 and 7, since they communicate with each other so as to be freely permeable, the communication between the communication portions of the boot chambers 6 and 7 flows from the high pressure side to the low pressure side according to the air pressure. Thus, the expansion / contraction of the expansion / contraction boots 4 and 5 does not become a resistance of the expansion / contraction operation, and smooth expansion / contraction is performed, and the suction of muddy water from the outside is prevented, so that sliding friction with the lead cam 2 portion and the like on the lead cam shaft 3 is prevented. A lubricating oil surface is formed on the part, and the seedling tank 1 is moved smoothly.

  Further, a lubrication oil supply device 9 for lubricating the fitting sliding portion of the lead cam 2 with respect to the lead cam shaft 3 is provided in the communication pipe 8 communicating between the boot chambers 6 and 7 between the left and right expansion / contraction boots 4 and 5. As described above, the right and left expansion and contraction boots 4 and 5 expand and contract in the communication pipe 8, whereby the air in the left and right boot chambers 6 and 7 flows to reduce the expansion and contraction resistance of the expansion and contraction boots 4 and 5. At the same time, since the lubricating oil supply device 9 communicates with the communication pipe 8, the lubricating oil supplied from the lubricating oil supply device 9 is supplied to the lead cam shaft 3 and the lead cam 2 of the left and right boot chambers 6, 7. Supply to the fitting sliding part and lubricate.

  The lubricating oil device 9 supplies lubricating oil for the seedling transmission device 11 that transmits the lead cam shaft 3 and the seedling planting device 10. The seedling planting device 10 causes the seedling tank 1 to reciprocate left and right by driving the lead cam 2 or the lead cam shaft 3 by the transmission of the seedling planting transmission device 11 to feed and feed the seedlings, The seedlings fed from the seedling tank 1 are separated and held and planted on the soil surface. The lubricating oil supply device 9 supplies a part of the lubricating oil that performs the lubricating action of the seedling transmission device 11 to the left and right boot chambers 6 and 7 so that the lead cam shaft 3 and the lead cam 2 slide. Lubricate the part.

  Furthermore, the convex part 14 which forms the gap | interval 13 between this folding overlapping surfaces 12 between the folding overlapping surfaces 12 of the bellows outer periphery of the expansion / contraction boots 4 and 5 is formed. The expansion / contraction boots 4 and 5 expand and contract the boot chambers 6 and 7 by forming a bellows-shaped folding overlapping surface 12 and expanding and contracting the gap 13 between the adjacent folding overlapping surfaces 12. When the boot chambers 6 and 7 are contracted, the folding overlap surfaces 12 are compressed to be folded and overlapped with each other, and the convex portions 14 are held between the folding overlap surfaces 12. By interposing the convex portion 14 between the folding overlapping surfaces 12 of the expansion / contraction boots 4 and 5, the close contact between the folding overlapping surfaces 12 is prevented. It is easy to spread between twelve.

  The communicating portion that communicates between the left and right boot chambers 6, 7 is provided by bypassing the communication pipe 8 over the outer periphery of the lead cam 2 that connects the inner ends of the expansion / contraction boots 4, 5, and between the boot chambers 6, 7. Communicate to facilitate air flow. Further, without bypassing the communication pipe 8, for example, a communication path may be formed in the metal of the lead cam 2 so that the left and right boot chambers 6 and 7 communicate with each other.

  An oil tank communicating with the communication pipe 8 is connected as a lubricating oil supply device 9 by an oil supply hose 18, and the suction pressure is applied to the oil tank by expansion and contraction of the boot chambers 6, 7. It can also be configured to inhale into 7. Further, the lubricating oil supply device 9 may be configured such that the oil is sprayed into the boot chambers 6 and 7 by a plunger injection mechanism or the like.

  Further, as shown in FIG. 4, the boot chambers 6, 7 are communicated with the inside of the seedling planting transmission case 30 by the oil supply hose 19, and a part of the lubricating oil in the seedling planting transmission case 30 is sucked into the boot chamber 6. , 7 can also be configured to lubricate.

  The expansion / contraction boots 4 and 5 are formed in a bellows shape from a rubber material or the like. The outer peripheral surfaces of the expansion / contraction boots 4 and 5 are such that the adjacent folding polymerization surfaces 12 are polymerized in a close contact state at the time of reduction A. At this time, the convex part 14 is formed so as to form a gap 13 part between the folded overlapping surfaces 12, but this convex part 14 comes into contact with the opposing folded overlapping surface 12, and the periphery of the convex part 14 When the boot chambers 6 and 7 expand B by forming a gap 13 in the folding space, the folding surfaces 12 are easily opened.

  Next, mainly based on FIG. 1 and FIG. 6, in the transmission configuration of each seedling planting rotor 17 and this seedling planting claw 29, the sprocket 56 of the rotor shaft 55 is engaged with a chain 57 and an eccentric gear. The sprocket 56 is configured to rotate at an inconstant speed by the transmission rotation of the eccentric gear. Therefore, when a protrusion 58 is formed at a fixed position of the sprocket 56 and the protrusion 58 rotates and approaches the magnet 59 provided in the seedling planting transmission case 30, a magnetic speed rotation resistance is generated, and this non-uniform rotation is prevented. It is designed to alleviate and reduce the transmission phenomenon. In this case, the positions of the protrusion 58 and the magnet 59 are set immediately after the peak of the inconstant speed rotation due to the eccentric gear. Metal powder is adsorbed by the magnetic force of the magnet 59 to improve the durability of the rotating part.

  Next, mainly based on FIG. 7, the operation of the main transmission lever 60 that performs the shifting operation of the hydraulic continuously variable transmission 41 is fixed by the half-depressing operation of the brake pedal 61 to restrict the shifting operation. It is intended to improve safety by preventing sudden start-up and rapid acceleration when storing the seedling transplanter, when loading next to the truck for transportation, or when traveling over the ridge. The main transmission lever 60 rotates the trunnion shaft 62 of the hydraulic continuously variable transmission 41 and operates it from the neutral position N to the forward position F or the reverse position B to perform forward high speed or reverse high speed travel shift. It can be carried out. A bifurcated forward neutral arm 63 and a reverse neutral arm 64 which are integrally rotated around the trunnion shaft 62 by the main transmission lever 60 are provided, and an angle between the forward neutral arm 63 and the reverse neutral arm 64 is provided. Are connected to the connection plate 65 on the coaxial 62, the long holes 66 and 67 on the arms 63 and 64, and the bolts 68 and 69 which are fitted and tightened to the arms 63 and 64 so that the opening degree can be adjusted. The brake pedal 61 has a pedal shaft 70 disposed immediately below the trunnion shaft 62, and a forward neutral return cam 71 and a reverse neutral return cam 72 are formed around the pedal shaft 70 of the brake pedal 61. By depressing the brake pedal 61 and braking the traveling brake, the forward neutral return cam 71 or the reverse neutral return cam 72 pushes the opposite forward neutral arm 63 or reverse neutral arm 64 to move to the forward position F or reverse position. The main transmission lever 60 at B is operated to return to the neutral position N. Further, the depression position of the brake pedal 61 is often operated as a half depression state (half brake state). In these cases, the shift lever 61 is returned to the neutral position N or a position close to the neutral position N. Thus, the forward position F or the reverse position B is regulated so as not to be actuated to the speed increasing side. Next, mainly based on FIG. 8 and FIG. 9, when the work mounting shaft 76 is fitted and mounted to the hitch socket 75 and the mounting pin 79 is inserted into the pin holes 77 and 78 of the mounting portion and fixed, A base portion of the mounting pin 79 is formed in a crank shape, and an engaging portion 80 that rotates around the mounting pin 79 and fits to the outer peripheral surface of the hitch socket 75 is formed. The working tool is configured to be mounted as a stock rake 81 in place of the stock rotor 54. Reference numeral 82 denotes a bracket for mounting the hitch socket 75. A convex portion 83 for engaging the concave portion of the hitch socket 75 is formed inside the front end of the engaging portion 80 so that the mounting pin 79 can be easily prevented from coming off by the engagement.

  Next, mainly based on FIG. 10, FIG. 11, and FIG. 12, a damper is provided on the wheel of the seedling transplanter, and the vehicle body support pressure by the damper is switched between strong and weak depending on the steering operation, or the wheel lift is restricted. It is to be controlled. An axle steering case 86 that axially mounts the axle 85 of the front wheel 23 and the rear wheel 24 is provided around the steering shaft 88 at both left and right ends of the axle housing 87 so as to be steerable and rotated by the steering handle 20. Steering can be linked. The axle housing 87 is transmitted from the interlocking shaft 89 to the steering shaft 88 by meshing with the bevel gear 90, and further, the axle 85 can be driven to rotate by meshing with the bevel gear 91.

  A terminal case 92 at the end of the axle housing 87 is provided around the steering shaft 88, and the upper end of the steering case 86 is fitted around the terminal case 92 so as to be rotatable and slidable. Further, a coupling 94 containing springs 98 and 99 is provided at the upper end portion of the terminal case 92, and the arm of the upper end portion of the arm 93 projecting upward from the steering case 86 on the outer peripheral portion of the coupling 94. The cylinder 104 is fitted so as to be rotatable and slidable. The strong and weak springs 98 and 99 are interposed between the plate 95 at the upper end of the terminal case 92, the upper end of the coupling 94, and the seat 97 of the actuator 96. On the other hand, the weight of the vehicle body 15 on the axle housing 87 side is supported. By changing the compressive force of the weak spring 99 by the actuator 94, the wheel support force by both the springs 98 and 99 can be adjusted and switched.

  Further, an actuator 100 for regulating the rear wheel up and down is provided between the axle housing 87 of the rear wheel 24 and the steering case 86, and the vertical movement range of the axle housing 87 of the rear wheel 24 by expansion and contraction of the actuator 100. Can be regulated.

  The controller 101 that controls the front and rear wheel 23, the rear wheel 24 strength actuators 96, and the rear wheel 24 up-and-down regulating actuator 100 includes an auxiliary transmission lever sensor 102 on the input side, and a planting lifting operation switch. 103 etc. are provided. When the sub-shift lever sensor 102 detects the vehicle traveling speed of the vehicle speed, the actuator 96 controls the damper of the front wheel 23 or the rear wheel 24 to soften, and when the low speed seedling traveling speed is detected, the damper is controlled to harden. In addition, the seedling raising / lowering operation switch 103 can be used to raise and lower the seedling planting device 10 using the lift cylinder 27 to lower the seedling planting posture or raise it to a non-seedling posture. By doing so, the expansion and contraction of the actuator 100 can be fixed to prevent the rear portion of the vehicle body 15 from sinking.

  The damper mechanism as shown in FIG. 11 is constituted by an axle housing on the front wheel 23 or rear wheel 24 side, and the axle housing of the rear wheel 24 is simply supported by a damper spring so as to move up and down as shown in FIG. It is also possible to adopt a form that does not require steering. An axle case 105 having an axle 85 with respect to the vehicle body 15 is provided to be swingable up and down around the case support shaft 106. A damper is provided between a bracket 107 of the axle case 105 and a bracket 108 on the vehicle body 15 side. Springs 98 and 99 are provided. Of these, the weak spring 99 is configured to adjust the pressure by an actuator 96. Also, the bracket 108 on the vehicle body 15 side is provided with an actuator 109 for restricting the vertical movement of the rear wheel 24, and a pin 110 extended by the actuator 109 is applied to the stopper 111 of the axle case 105, The upward movement of the axle case 105 relative to the vehicle body 15 is locked.

DESCRIPTION OF SYMBOLS 1 Seedling tank 2 Lead cam 3 Lead cam shaft 4 Expansion / contraction boot 5 Expansion / contraction boot 6 Boot chamber 7 Boot chamber 8 Communication pipe 9 Lubricating oil supply device 10 Seedling device 11 Seedling transmission device 12 Folding overlapping surface 13 Gap 14 Convex

Claims (4)

  A lead cam (2) provided integrally with the seedling tank (1) is fitted and fitted to the lead cam shaft (3) on the outer periphery of the lead cam shaft (3) reciprocatingly moved in the width direction of the seedling tank. A pair of left and right expansion / contraction boots (4) and (5) covering the lead cam (2) and the both ends of the lead cam shaft (3) are provided, and the pair of left and right expansion / contraction boots (4) and (5) The boot chambers (6) and (7) are connected to each other so as to be able to ventilate each other.   In the communication pipe (8) communicating between the boot chambers (6) and (7) between the left and right expansion / contraction boots (4) and (5), a fitting sliding portion of the lead cam (2) with respect to the lead cam shaft (3) is provided. The seedling tank moving device of the seedling transplanter according to claim 1, further comprising a lubricating oil supply device (9) for lubrication.   The lubricating oil supply device (9) supplies the lubricating oil of the seedling planting transmission device (11) that transmits the lead cam shaft (3) and the seedling planting device (10). The seedling tank moving device of the seedling planting machine described.   A convex portion (14) forming a gap (13) between the folding overlapping surfaces (12) is formed between the folding overlapping surfaces (12) on the bellows outer periphery of the expansion / contraction boots (4) (5). The seedling tank moving device of the seedling transplanter according to claim 1, 2, or 3.

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