JP7171368B2 - Work machine with mulch film laying device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a working machine equipped with a mulching film laying device for laying a mulch film in a field.

BACKGROUND ART Conventionally, a working machine disclosed in Patent Document 1 is known.
The work machine disclosed in Patent Document 1 includes a rotary work machine, a ridge forming device, and a mulch film laying device, and forms ridges in a field plowed by the rotary work machine to lay a mulch film. can be done.

JP 2006-271316 A

However, with the working machine described above, it is not possible to lay a mulch film by narrowing the gap between two adjacent ridges.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a working machine equipped with a mulching film laying device capable of laying a mulch film by narrowing the space between two adjacent ridges.

A work machine equipped with a mulch film laying device according to an aspect of the present invention comprises a mulch film laying device that is attached to the rear of a traveling body and that lays a mulch film on ridges formed in a field ; A work machine comprising: a rotary cultivator mounted on a The mulch film laying device includes a front mounting portion and a rear mounting portion provided at the rear portion of the ridge riser, and the mulch film laying device receives a first film roll around which the mulch film to be laid on the first ridge is wound. A first roll support shaft for supporting and a second roll support shaft for supporting a second film roll around which a mulch film is laid on a second ridge adjacent to the first ridge, The first roll support shaft and the second roll support shaft extend in the width direction of the traveling body and overlap in the width direction. The shaft is movable in the width direction, and the movement can change the overlapping range of the first roll support shaft and the second roll support shaft, and the end portion of the first roll support shaft is , the end of the second roll support shaft is supported by a second shaft support, the first shaft support and the second shaft support are supported by the It is attached to an intermediate connector connecting the rear attachment portion and the attachment attached to the rotary tiller.

Also, the first roll support shaft and the second roll support shaft are arranged to be shifted in the front-rear direction.
Also, the first roll support shaft and the second roll support shaft are arranged to be shifted in the vertical direction.
Further, the mulch film laying apparatus includes a first soil covering member for covering the end of the mulch film laid on the first ridge on the second ridge side with soil, and a mulch film laid on the second ridge. and a second soil-covering member for covering the end portion on the first ridge side with soil, wherein the first soil-covering member and the second soil-covering member are arranged to be shifted in the front-rear direction.

Further, the first soil covering member and the second soil covering member are arranged so as to overlap each other in the width direction.
In addition, one of the first soil covering member and the second soil covering member is arranged behind the other soil covering member, and the lower end of the one soil covering member is located on the other soil covering member. Positioned below the lower end , the one soil covering member can gather soil from a deeper position than the other soil covering member.

Further, the mulch film laying apparatus includes a first film retainer for pressing the end portion of the mulch film laid on the first ridge on the second ridge side, and the mulch film laid on the second ridge. and a second film presser that presses the end portion on the side of the first ridge, and the first film presser and the second film presser are arranged to be shifted in the front-rear direction.
Further, the work machine includes the mulch film laying device, and a transplanter attached to the rear of the traveling body for planting seedlings on the ridges.

According to the work machine equipped with the multi-film laying device, since the first roll support shaft and the second roll support shaft overlap in the width direction of the traveling vehicle, the gap between two adjacent ridges is narrowed. A mulch film can be laid.

It is a side view of a working machine. It is a top view of a ground work apparatus. It is a side view of a ground work apparatus. 1 is a system diagram of a power transmission device of a tractor; FIG. It is a rotary cultivator, a side view of a ridger. 1 is a plan view of a rotary cultivator and a ridger; FIG. FIG. 4 is a side cross-sectional view showing a transmission system of power transmitted to the rotary tiller; It is a rotary cultivator, a rear perspective view of a ridger. 1 is a side view of a rotary tiller, a ridger, and a mounting; FIG. Fig. 2 is a rear view of the rotary tiller, ridger and mounting body; 1 is a configuration diagram showing a power transmission system of a working machine; FIG. It is a front perspective view showing a chair support and a seedling feeder. It is a top view which shows a rotary tiller, a connection link mechanism, and a preliminary seedling stand. FIG. 11 is a side view showing movement of the chair support and transplanter when the lift drive is activated; It is a rear perspective view which shows the attachment structure of an intermediate ridge riser. It is a top view of a machine frame. It is a side view of a machine frame. It is a front view of a machine frame. FIG. 4 is a front view showing the operation of an angle adjustment mechanism that adjusts relative angles between multiple planting devices; It is a top view which shows a seedling supply apparatus, a 1st rear chair, a 2nd rear chair, etc. FIG. It is a rear perspective view of a connection frame and a stand. It is a rear view of a connection frame and a stand. 4 is a side view of the connecting frame and the stand; FIG. Fig. 2 is a plan view showing part of the power transmission system of the transplanter; It is a top view explaining the expansion-contraction structure of a main shaft. 4 is a cross-sectional view of a main shaft and a cover cylinder; FIG. It is a side view which shows a part of power transmission system of a transplanter, a planting apparatus, etc. FIG. 1 is a plan view of a planting device; FIG. It is a front perspective view showing an angle adjustment mechanism for adjusting the relative angle between a plurality of planting devices, a position adjustment section (first position adjustment section) for adjusting the position of the soil covering device, and the like. FIG. 4 is a side view showing a state in which the detection member (covering soil wheel) and the support frame are vertically swinging with respect to the machine frame; It is a top view of a detection member (covering soil wheel), a support rod, and a support frame. 4 is a side view showing a support frame, first rocking plate, wires, and the like; FIG. It is a perspective view which shows a rear position adjustment mechanism. FIG. 11 is a front view showing a state in which the positions of the support frame and the detection member (covering soil wheel) are being adjusted by the front position adjustment mechanism and the rear position adjustment mechanism; FIG. 4 is a side view showing control valves, wires, etc. FIG. It is a side view which shows operation|movement of a 1st control lever. It is a top view of a seedling supply apparatus. FIG. 4 is a plan view showing the arrangement of the lid of the supply cup; It is a perspective view which shows the circumference|surroundings of a 2nd open position as seen from upper direction. It is a perspective view which shows the periphery of a 2nd open position seen from the downward direction. FIG. 3 is a side view showing the supply cup, intermediate hopper and planting tool; It is a longitudinal cross-sectional view of the first guide member, the second guide member, etc. in the second open position. It is a front view which shows a 1st position adjustment mechanism. It is a side view which shows a 2nd position adjustment mechanism. It is a side view which shows a 3rd position adjustment mechanism. It is a perspective view which shows a part of position adjustment mechanism and a support mechanism. It is a perspective view which shows a 1st front chair, a footrest board, etc. FIG. It is a perspective view which shows the attachment method of a footrest board. 1 is a side view of a transplanter; FIG. It is a perspective view which shows the effect|action (operation) of a rotation support mechanism. It is a rear view which shows the effect|action (operation) of a rotation support mechanism. It is a perspective view which shows a movement of a seedling supply stand. It is a perspective view which shows another movement of a seedling supply stand. It is a top view which shows the replacement method of a seedling supply stand. It is a front perspective view which shows a preliminary seedling stand etc. FIG. 1 is a plan view of a rotary tiller and a mulch film laying device; FIG. FIG. 2 is a side view of the rotary cultivator and the mulch film laying device at substantially the center in the machine width direction. It is a rotary tiller, a top view of the left part of a mulch film laying apparatus. It is a rotary cultivator, a side view of the left part of a mulch film laying apparatus. It is a rear view around the left part of a 1st film roll. Fig. 2 is a plan view of the rotary cultivator and the mulch film laying device at substantially the center in the machine width direction;

An embodiment of the present invention will be described below with appropriate reference to the drawings.
FIG. 1 shows a work machine 1 that can perform ground work (cultivation, etc.) and seedling planting (transplanting) while traveling. The working machine 1 has a traveling body 1A and a ground working device 1B attached to the rear portion of the traveling body 1A. The ground working device 1B includes a first ground working machine 2 attached to the rear part of the traveling body 1A so as to be able to be raised and lowered, and a second ground working machine 3 attached to the rear part of the first ground working machine 2 so as to be raised and lowered. ing.

In this embodiment, a tractor, which is a traveling vehicle, is exemplified as the traveling body 1A. Further, a rotary tiller is exemplified as the first ground working machine 2 . A transplanter for planting seedlings in a field is illustrated as the second ground working machine 3 . Hereinafter, the traveling body will be referred to as a tractor 1A, the first ground working machine will be referred to as a rotary tiller 2, and the second ground working machine will be referred to as a transplanter 3.
In addition, the traveling body 1A is not limited to a tractor, and may be another traveling vehicle. Further, the first ground working machine 2 is not limited to a rotary tiller, and may be any machine that works on a field. Further, although the rotary tiller 2 is a center drive rotary tiller, it may be a side drive rotary tiller.

FIG. 1 shows a side view of a working machine 1. FIG. Unless otherwise specified in the embodiments, the front side of the driver (left side in FIG. 1) sitting in the driver's seat 5 of the tractor 1A is the front side, the rear side of the driver (right side in FIG. 1) is the rear side, and the left side of the driver ( 1) is the left side, and the driver's right side (back side in FIG. 1) is the right side. Also, a horizontal direction K2 (see FIG. 2), which is a direction orthogonal to the front-rear direction K1 (see FIG. 1) of the tractor 1A, will be described as a machine width direction K2.

Also, the direction from the center of the tractor 1A in the machine width direction to the right or left will be described as the machine width outer side. In other words, the machine width outward direction is the machine width direction K2 and the direction away from the machine width direction central portion of the tractor 1A. A direction from the right side or the left side of the tractor 1A to the center is defined as the inner side of the machine width. That is, the machine width inner side is the opposite direction to the machine width direction outer side. In other words, the machine width inner side is the machine width direction K2 and the direction approaching the machine width direction central portion of the tractor 1A.

As shown in FIG. 1, the tractor 1A has a vehicle body 6 and a traveling device 7 including front wheels 7F attached to the front portion of the vehicle body 6 and rear wheels 7R attached to the rear portion of the vehicle body 6. As shown in FIG. The vehicle body 6 has a prime mover (driving source) E1 and a power transmission case T1 connected to the rear portion of the prime mover E1.
Prime mover E1 is, for example, a diesel engine. Further, the prime mover E1 may be a gasoline engine, an LPG engine, an electric motor, or a hybrid type having an engine and an electric motor.

The power transmission case T1 is configured by directly connecting a clutch housing containing a clutch, a transmission case containing a transmission, a differential case containing a differential, and the like.
A driver's seat 5 is mounted on the rear portion of the vehicle body 6, and a power take-off shaft (so-called PTO shaft) 22 for taking out the power of the prime mover E1 is provided so as to protrude rearward. That is, the traveling body 1A has a power take-off shaft 22 for taking out the power of the prime mover E1. A steering wheel 8 is provided in front of the driver's seat 5 . The tractor 1A also has a battery (not shown) mounted in the front.

FIG. 4 shows the power transmission device 4 that transmits the power of the prime mover E1 to the power take-off shaft 22 and the travel device 7. As shown in FIG.
The power transmission device 4 has a main propulsion shaft 4a, a main transmission portion 4b, an auxiliary transmission portion 4c, a shuttle portion 4d, a PTO clutch 4e, and a PTO propulsion shaft 4f.
Power from the prime mover E1 is intermittently transmitted to the main propulsion shaft 4a via a clutch. The main transmission section 4b has a plurality of gears and a shifter for changing the connection of the gears. By appropriately changing the connection (engagement) of the plurality of gears with the shifter, the rotation input from the main propulsion shaft 4a is changed. and output (change speed). Like the main transmission portion 4b, the auxiliary transmission portion 4c has a plurality of gears and a shifter for changing the connection of the gears. It changes the rotation input from 4b and outputs it (changes speed). The shuttle portion 4d transmits the rotational power from the auxiliary transmission portion 4c to the output shaft 4g in a forward rotation state (forward rotation) or in a reverse rotation state (reverse rotation). The power transmitted to the output shaft 4g is transmitted to the rear wheels 7R via the rear wheel differential device 4h. The power transmitted to the output shaft 4g may also be transmitted to the front wheels 7F. That is, the prime mover E1 drives the travel device 7 .

The PTO clutch 4e intermittently transmits rotational power from the main propulsion shaft 4a to the PTO propulsion shaft 4f. The rotational power from the prime mover E1 transmitted to the PTO propulsion shaft 4f is transmitted to the power take-off shaft 22 via gears and the like. Therefore, by changing the vehicle speed of the tractor 1A by changing the rotation speed of the prime mover E1, the rotation of the power take-off shaft 22 is interlocked with the vehicle speed.
As shown in FIG. 1, the rotary cultivator 2 is attached to the rear portion of the tractor 1A via an attachment mechanism such as a three-point link mechanism 9 so as to be able to move up and down. The three-point link mechanism 9 has a top link 9A and a lower link 9B and is attached to the rear portion of the vehicle body 6. As shown in FIG. A lift link 10A that can swing up and down is provided at the rear portion of the vehicle body 6, and the lift link 10A is connected to a lower link 9B via a lift rod 10B. The lift link 10A is driven up and down by a hydraulic device 10C provided at the rear upper portion of the vehicle body 6, and the lower link 9B is raised and lowered by vertical movement of the lift link 10A. As a result, the rotary tiller 2 moves up and down.

As shown in FIGS. 5 , 6 and 8 , the rotary tiller 2 has a rotary machine frame 11 . The rotary machine frame 11 has a transmission case 12, a front support frame 13F, a rear support frame 13R, a left side frame 15L and a right side frame 15R. The transmission case 12 is positioned at the center of the rotary cultivator 2 in the width direction (the same direction as the machine width direction K2). The front support frame 13F is arranged in front of the transmission case 12 and extends in the machine width direction K2. The rear support frame 13R is arranged behind the transmission case 12 so as to extend in the machine width direction K2. The front support frame 13F and the rear support frame 13R are connected to the transmission case 12. As shown in FIG. The left side frame 15L connects the left ends of the front support frame 13F and the rear support frame 13R. The right side frame 15R connects the right ends of the front support frame 13F and the rear support frame 13R. A mounting frame 14 to which the three-point link mechanism 9 is connected is attached to the rotary machine frame 11 .

As shown in FIG. 6, the mounting frame 14 has forward extending portions 34L and 34R extending forward from the front support frame 13F. A lower link 9B of the three-point link mechanism 9 is connected to the forward extending portions 34L, 34R. Front portions of extension members 35L and 35R extending rearward from the upper portions of the forward extending portions 34L and 34R are attached to the upper portions of the forward extending portions 34L and 34R. Rear portions of the extension members 35L and 35R are attached to the upper portion of the rear support frame 13R.

As shown in FIGS. 5 to 7, a rotating shaft 16 having an axis in the machine width direction K2 is provided at the lower portion of the transmission case 12 so as to protrude from one side and the other side in the machine width direction K2. A large number of tillage tines 17 are fixed to the outer periphery of the rotary shaft 16 via brackets. As the rotating shaft 16 rotates about its axis in the direction of arrow X1 in FIG. 5, the plowing tines 17 plow the field and throw the plowed soil to the rear rear cover 19B. The rotary shaft 16 and the tillage tines 17 constitute a tillage section 18 for tilling the field.

As shown in FIGS. 5, 6, and 8, the tilling section 18 is covered with a rotary cover 19 attached to the rotary machine frame 11. As shown in FIGS. The rotary cover 19 has an upper cover 19A, a rear cover 19B and side covers 19C. The upper part of the plowing section 18 is covered with an upper cover 19A. The rear part of the tilling section 18 is covered with a rear cover 19B. The upper end of the rear cover 19B is pivotally supported by the rotary machine frame 11 via a pivot 19D so as to be rotatable around the axis in the machine width direction K2, and is vertically swingable. The rear cover 19B is biased downward by a pressing device 20. As shown in FIG. The pressing device 20 is a device that urges the rear cover 19B downward with the force of a spring. The rear cover 19B forms the upper surface of ridges formed by a ridge riser 51, which will be described later.

The sides of the plowing section 18 are covered with a side cover 19C. The side cover 19C has a first side cover 19CL and a second side cover 19CR. The first side cover 19CL is arranged on one side (left side) of the rotary tiller 2 in the width direction (machine width direction K2). The second side cover 19CR is arranged on the other side (right side) of the rotary tiller 2 in the width direction (machine width direction K2).

The first side cover 19CL is attached to the left side frame 15L. The second side cover 19CR is attached to the right side frame 15R. The first side cover 19CL and the second side cover 19CR have the same configuration except for the mounting position. Therefore, the configuration of the first side cover 19CL will be described, and the description of the second side cover 19CR will be omitted.

As shown in FIGS. 8 and 9, the first side cover 19CL has an upper side cover 19C1, a lower side cover 19C2, a front side cover 19C3, and a support cover 19C4. The upper side cover 19C1 covers the upper side of the tilling section 18. As shown in FIG. The lower side cover 19C2 covers the lateral lower portion of the plowing section 18. As shown in FIG. The upper cover 19C1 is attached to the left side frame 15L. The lower cover 19C2 is connected to the upper cover 19C1 via a connection plate 19C5. The front side cover 19C3 extends forward from the front end of the upper side cover 19C1.

As shown in FIGS. 8 and 9, the support cover 19C4 has a side plate 19Cs, an upper plate 19Cu, and a lower plate 19Cd. The side plate 19Cs is attached to the surface of the left side frame 15L on the machine width outer side. The upper plate 19Cu and the lower plate 19Cd extend outward from the side plate 19Cs. The upper plate 19Cu and the lower plate 19Cd are arranged with a gap therebetween in the vertical direction. A front portion of the mounting body 196 is supported between the upper plate 19Cu and the lower plate 19Cd.

As shown in FIGS. 2 and 8, the mounting body 196 has a first side member 196A, a second side member 196B, and an intermediate member 196C. The first side member 196A is arranged on the left side of the rotary tiller 2 and attached to the left support cover 19C4. The second side member 196B is arranged on the right side of the rotary tiller 2 and attached to the right support cover 19C4. The first side member 196A and the second side member 196B extend rearward from the front end of the rotary tiller 2 . The intermediate member 196C is arranged between the first side member 196A and the second side member 196B. The intermediate member 196</b>C is arranged at the center of the rotary tiller 2 in the width direction (machine width direction K<b>2 ) and attached to the rear support frame 13</b>R of the rotary machine frame 11 .

As shown in FIGS. 8 to 10, the mounting body 196 has a ridge riser 51 mounted thereon. The ridge erector 51 is composed of, for example, a ridger. The ridge riser 51 has a shape in which the width (the length in the machine width direction) widens from the front to the rear in a plan view. As shown in FIGS. 8 and 10, the ridge riser 51 includes side ridge risers 51L, 51R and an intermediate ridge riser 51M. The side ridgers 51L, 51R include a first side ridger 51L and a second side ridger 51R. Therefore, by forming grooves in the soil plowed by the rotary tiller 2 with three ridgers (first side ridger 51L, intermediate ridger 51M, and second side ridger 51R), two ridges can be obtained. can be formed. The upper surface of the ridge is formed by the rear cover 19B. Note that three or more ridges may be formed.

The first side ridger 51L is arranged on one side (left side) of the rotary tiller 2 in the width direction. The second side ridger 51R is arranged on the other side (right side) of the rotary tiller 2 in the width direction. The intermediate ridge riser 51M is arranged in the center of the rotary tiller 2 in the width direction.
The first side ridge riser 51L forms the left side of the left ridge of the two ridges. The second side ridge riser 51R forms the right side of the right ridge of the two ridges. The intermediate ridge riser 51M forms the right flank of the left ridge and the left flank of the right ridge.

The first side ridger 51L has attachment portions 51La and 51Lb attached to the rotary tiller 2 . The attachment portions 51La and 51Lb include a front attachment portion 51La provided at the front portion of the first side ridge riser 51L and a rear attachment portion 51Lb provided at the rear portion of the first side ridge riser 51L. .
As shown in FIGS. 6, 8, and 9, the front attachment portion 51La of the first side ridge riser 51L is provided at the front end of the first side ridge riser 51L, and the front attachment body 52 is attached to the front attachment portion 51La. It is attached to the first side cover 19CL via the first side cover 19CL. The front portion of the front attachment body 52 is attached to the outer surface (surface on the machine width outer side) of the first side cover 19CL. The front mounting body 52 is bent so as to move outward in the width direction toward the rear. A front attachment portion 51La of the first side ridge riser 51L is attached to the rear portion of the front attachment body 52 . The vertical position of the front mounting portion 51La with respect to the front mounting body 52 can be adjusted.

A rear attachment portion 51Lb of the first side ridge riser 51L is attached to the first side member 196A via a side connector 53. As shown in FIG. A rear mounting portion 51Lb of the first side ridge riser 51L protrudes rearward from the first side ridge riser 51L. The side connector 53 extends vertically, and has a lower end connected to the rear mounting portion 51Lb of the first side ridge riser 51L and an upper end connected to the first side member 196A. The length of the side connecting body 53 can be adjusted by moving the lower member 53b in and out of the upper member 53a. By adjusting the length of the side connector 53, the height of the first side ridge riser 51L can be adjusted.

Since the mounting structure of the front mounting portion 51Ra and the rear mounting portion 51Rb of the second side ridge riser 51R is the same as the mounting structure of the front mounting portion 51La and the rear mounting portion 51Lb of the first side ridge riser 51L, Description is omitted.
As shown in FIG. 6, the outer ends of the side ridgers 51L and 51R in the width direction of the rotary tiller 2 (ends on the outer side of the width of the machine) are aligned with the width of the rotary tiller 2 of the side cover 19C. It is located outside the outer end in the direction (the end on the outer side of the machine width). Specifically, the left end of the first side ridge riser 51L is positioned to the left of the left end of the first side cover 19CL. The right end of the second side ridge riser 51R is positioned to the right of the right end of the second side cover 19CR.

As shown in FIGS. 7 and 15, the front attachment portion 51Ma of the intermediate ridge 51M is attached to the lower portion of the transmission case 12 via an intermediate attachment 54. As shown in FIGS. The intermediate attachment body 54 has a front end attached to the front lower portion of the transmission case 12 and a rear end attached to the front attachment portion 51Ma of the intermediate ridge riser 51M. The intermediate mounting body 54 has a length adjusting portion 54a whose length can be adjusted in the middle portion between the front end portion and the rear end portion. The position of the front mounting portion 51Ma with respect to the transmission case 42 can be adjusted by adjusting the length of the length adjusting portion 54a.

As shown in FIGS. 8 and 15, the rear attachment portion 51Mb of the intermediate ridge riser 51M is attached to the intermediate member 196C via the intermediate connector 55. As shown in FIGS. A rear mounting portion 51Mb of the intermediate ridge riser 51M protrudes rearward from the intermediate ridge riser 51M. The intermediate connecting body 55 extends vertically, has a lower end connected to the rear mounting portion 51Mb of the intermediate ridge erector 51M, and an upper end connected to the intermediate member 196C. The length of the intermediate connecting body 55 can be adjusted by inserting and removing the lower member 55b with respect to the upper member 55a. By adjusting the length of the intermediate connector 55, the height of the intermediate ridge riser 51M can be adjusted.

As shown in FIGS. 5, 6, 8 and 9, earth gathering disks 56L and 56R are arranged in front of the rotary tiller 2. As shown in FIGS. The soil gathering disks 56L and 56R are members for gathering soil toward the tillage section 18 inwardly of the width of the machine. The earth gathering disk 56</b>L is arranged on one side (left side) in the machine width direction, and is positioned on the front left side of the rotary tiller 2 . The earth gathering disk 56</b>R is arranged on the other side (right side) in the machine width direction, and is positioned on the front right side of the rotary tiller 2 . The earth gathering discs 56L and 56R are obliquely arranged so as to shift from the outer side of the machine width to the inner side of the machine width from the front to the rear in a plan view. The earth gathering discs 56L and 56R are attached to the front support frame 13F of the rotary machine frame 11 via a disc attachment body 57 and a bracket (not shown). The length of the disk mounting body 57 can be adjusted by moving the lower member 57b in and out of the upper member 57a. By adjusting the length of the disc mounting body 57, the height of the earth gathering discs 56L and 56R can be adjusted.

As shown in FIGS. 5 and 7 , an input shaft (so-called PIC shaft) 21 for introducing power into the rotary cultivator 2 is provided at the front portion of the upper portion of the transmission case 12 . As shown in FIG. 1, the input shaft 21 is interlockingly connected to the power take-off shaft 22 by a joint (universal joint) J1. Therefore, power is transmitted from the power take-off shaft 22 to the input shaft 21 via the joint J1. In other words, power is transmitted from the power take-off shaft 22 to the rotary tiller (first ground working machine) 2 .

As shown in FIGS. 7 and 11, the rear portion of the input shaft 21 is provided with a first gear (bevel gear) G1. The first gear G1 meshes with the second gear (bevel gear) G2. The second gear G2 is provided on the first transmission shaft S1 having an axis in the machine width direction K2. A third gear (spur gear) G3 is provided on the first transmission shaft S1. The third gear G3 meshes with a fourth gear (spur gear) G4 located below the third gear G3. The fourth gear G4 meshes with a fifth gear (spur gear) G5 located below the fourth gear G4. A fifth gear G5 is provided on the rotating shaft 16 . Therefore, the power transmitted to the input shaft 21 is transmitted to the rotating shaft 16 via the first to fifth gears G1 to G5, and the rotating shaft 16 rotates in the direction of arrow X1 in FIG.

As shown in FIG. 6, the first transmission shaft S1 extends from substantially the widthwise center of the rotary tiller 2 toward one (left) widthwise outward. A first sprocket SP1 is provided at one end (left end) of the first transmission shaft S1 on the machine width outer side. A second transmission shaft S2 extending in the machine width direction is provided in front of the first transmission shaft S1. A second sprocket SP2 is provided on the second transmission shaft S2. A chain 26 is stretched over the first sprocket SP1 and the second sprocket SP2. Thereby, the power transmitted to the first transmission shaft S1 is transmitted to the second transmission shaft S2.

As shown in FIG. 11, a sixth gear G6 is provided at one end (left end) of the second transmission shaft S2. The sixth gear G6 rotates integrally with the second transmission shaft S2. The sixth gear G6 is a pulse detection gear for measuring the number of revolutions of the second transmission shaft S2. By measuring the rotation speed of the second transmission shaft S2, the rotation speed of the motor E1 can be calculated.
As shown in FIG. 11, a pulse sensor 25 is provided near the sixth gear G6 to output a pulse signal (generate a pulse) by detecting the unevenness of the sixth gear G6. The pulse sensor 25 employs, for example, a magnetoresistive element type rotation sensor. The pulse sensor 25 is connected to a control device (not shown), and the generated pulses are input to the control device. The control device measures the rotation speed of the second transmission shaft S2 based on the signal from the pulse sensor 25 (performing signal processing). By measuring the rotation speed of the second transmission shaft S2, the rotation speed of the prime mover E1 can be calculated, and the movement amount of the work implement 1 can be calculated from the rotation speed of the prime mover E1. Also, the position (upper limit position) of the planting tool 64 can be detected. The control device is constructed using a microcomputer having a CPU, an EEPROM, and the like. The control device is, for example, connected to the battery of the tractor 1A and supplied with power from this battery.

As shown in FIG. 11, an electromagnetic clutch 24 is provided on one end side (left end side) of the second transmission shaft S2. The electromagnetic clutch 24 intermittently transmits the power transmitted to the second transmission shaft S2 to the third transmission shaft S3. The power transmitted to the third transmission shaft S3 is transmitted to the transplanter 3 via the power transmission system shown in FIG. A planting tool 64 and seedling supply devices 38A and 38B, which will be described later, are driven).

The electromagnetic clutch 24 is connected to and controlled by the control device described above. The electromagnetic clutch 24 is disconnected by a clutch disengagement signal from the control device and then connected by a clutch connection signal from the control device. That is, the electromagnetic clutch 24 is disconnected for the required time by the command signal from the control device. The transplanter 3 may be continuously driven without disconnecting the electromagnetic clutch 24 (without stopping the driving of the planting tool 64 and the seedling supply devices 38A and 38B).

Next, referring to FIG. 11, the power transmission system from the third transmission shaft S3 to the transplanter 3 will be described.
A worm 30 is provided on the third transmission shaft S3, and the worm 30 meshes with a worm wheel 31. As shown in FIG. The worm wheel 31 is provided on the fourth transmission shaft S4. The fourth transmission shaft S<b>4 is connected to the output shaft 32 via the brake 27 . The power transmitted to the third transmission shaft S3 is transmitted to the output shaft 32 via the worm 30, the worm wheel 31, the fourth transmission shaft S4 and the brake 27. Therefore, the power from the prime mover E1 is transmitted from the output shaft 32 to the transplanter 3 via the worm 30 and the like.

By transmitting power from the prime mover E1 to the transplanter 3 via the worm 30, the self-locking function of the worm (a state in which the worm cannot be rotated from the worm wheel) causes the planting tool 64 to jerk (planting tool). 64 stops short of the stop position (top dead center position) and reverses). In addition, the brake 27 prevents a situation in which the planting tool 64 does not move by inertia to the top dead center and reverses (falls) even if the electromagnetic clutch 24 is disconnected before the top dead center due to the biasing force of the spring. To prevent.

As shown in FIG. 6 , the worm 30 and the worm wheel 31 are housed in a casing 28 provided on the upper left portion of the rotary tiller 2 . A cover 29 is provided on the right side of the casing 28 to cover the electromagnetic clutch 24, the sixth gear (pulse detection gear) G6, and the pulse sensor 25 from above.
The brake 27, sixth gear (pulse detection gear) G6, pulse sensor 25, and electromagnetic clutch 24 are provided on one end side (left end side) of the rotary tiller 2 in the width direction (machine width direction K2). This allows the operator to easily access and adjust the brake 27, the sixth gear (pulse detection gear) G6, the pulse sensor 25, and the electromagnetic clutch 24 from the side of the rotary tiller 2. FIG.

The output shaft 32 is composed of a propeller shaft. The output shaft 32 extends rearward from the upper left portion of the rotary tiller 2 . As shown in FIG. 11 , a power branching mechanism 35 including a chain transmission mechanism or the like is provided in the forward halfway portion of the output shaft 32 . A part of the rotational power of the output shaft 32 is branched by the power branching mechanism 35 and transmitted to the irrigation pump 50 via the gear mechanism 49 to drive the irrigation pump 50 . As shown in FIG. 6, the irrigation pump 50 is mounted on the upper left part of the rotary tiller 2, and an irrigation tube (illustrated ) to send water.

Next, the transplanter 3 will be described.
As shown in FIGS. 2 and 11, the transplanter 3 has a plurality of transplantation units (first transplantation unit 36A, second transplantation unit 36B). The first transplanting unit 36A is provided on one side (left side) of the transplanter 3 in the machine width direction K2. The second transplanting unit 36B is provided on the other side (right side) of the transplanter 3 in the machine width direction K2.

The first transplanting unit 36A includes one machine frame (referred to as first machine frame) 37A, one seedling supply device (referred to as first seedling supply device) 38A, and a plurality of planting devices (referred to as first planting devices). 39A and a number of soil covering devices (referred to as first soil covering devices) 40A corresponding to the number of planting devices 39A. 38 A of 1st seedling supply apparatuses, 39 A of 1st planting apparatuses, and 40 A of 1st soil covering apparatuses are mounted in 37 A of 1st machine frames.

The second transplanting unit 36B includes one machine frame (referred to as a second machine frame) 37B, one seedling supply device (referred to as a second seedling supply device) 38B, and a plurality of planting devices (referred to as second planting devices). 39B, and the number of soil covering devices (referred to as second soil covering devices) 40B corresponding to the number of planting devices 39B. The second seedling supply device 38B, the second planting device 39B and the second soil covering device 40B are mounted on the second machine frame 37B.

In the following, the first machine frame 37A and the second machine frame 37B are collectively referred to as the machine frame 37 as well. Also, the first seedling supply device 38A and the second seedling supply device 38B are collectively referred to as the seedling supply device 38 . Moreover, the 1st planting apparatus 39A and the 2nd planting apparatus 39B are collectively called the planting apparatus 39. As shown in FIG. The first soil-covering device 40A and the second soil-covering device 40B are also collectively referred to as the soil-covering device 40 .
The seedling supply device 38 is a device that supplies seedlings (such as soil block seedlings) to the planting device 39 . The planting device 39 is a device for planting the seedlings supplied from the seedling supply device 38 in a field. 64. The soil-covering device 40 is a device for covering the roots of the planted seedlings with earth and pressing down the roots of the seedlings.

As shown in FIG. 11, the plurality of first planting devices 39A includes a left first planting device 39AL and a right first planting device 39AR. The plurality of first covering devices 40A includes a left first covering device 40AL corresponding to the first planting device 39AL and a first covering device 40AR corresponding to the first planting device 39AR. The plurality of second planting devices 39B also includes a left second planting device 39BL and a right second planting device 39BR. The plurality of second covering devices 40B includes a left second covering device 40BL corresponding to the second planting device 39BL and a second covering device 40BR corresponding to the second planting device 39BR.

Note that the number of transplantation units may be three or more. In addition, although it is preferable that a plurality of transplantation units be provided, a single transplantation unit may be provided. That is, the transplanter 3 should have at least one transplant unit. Therefore, the transplanter 3 only needs to have at least one seedling supply device. Also, at least one implantation device may be provided for one implantation unit. That is, the transplanter 3 only needs to have at least one planting device (planting tool).

As shown in FIGS. 2 and 3, the transplanter 3 is connected to the rear part of the rotary tiller 2 via a working machine connecting mechanism 41 so as to be able to move up and down. In addition, the transplanter 3 is driven up and down by the elevation driving device 42 .
As shown in FIG. 13, the work machine connection mechanism 41 has a tool bar 43 to which the transplanter 3 is attached, and a connection link mechanism 44 that connects the tool bar 43 to the rotary tiller 2 so as to be able to move up and down.

The toolbar 43 is formed of a square pipe, and is provided behind the rear support frame 13R so as to extend in the machine width direction K2. A transplanter 3 is attached to the toolbar 43 . Specifically, a first transplanting unit 36A (first machine frame 37A) and a second transplanting unit 36B (second machine frame 37B) are attached to the toolbar 43 . Also, the first transplanting unit 36A and the second transplanting unit 36B are attached to the tool bar 43 so as to be positionally adjustable in the machine width direction K2.

As shown in FIG. 12 and the like, a chair support 150 is connected to the toolbar 43 . The chair support 150 supports the chairs (first front chair 187A and second front chair 187B) on which workers working on the transplanter 3 sit. A chair support 150 is positioned between the rotary tiller 2 and the transplanter 3 . The chair support 150 has a first support 151 , a second support 152 , a connector 153 and a position adjustment mechanism 230 .

The first support 151 has a front support 151a, a rear support 151b, and a connecting support 151c. The front support member 151a and the rear support member 151b are spaced apart in the front-rear direction and extend parallel to each other in the machine width direction K2. The connection support member 151c extends in the front-rear direction and connects the front support member 151a and the rear support member 151b. The connection support member 151c includes a plurality of (six) connection support members 151c. The plurality of connecting support members 151c are arranged parallel to each other at intervals in the machine width direction. Column members 155L and 155R extending upward are attached to two connecting support members 151c1 and 151c2, which are arranged across the center in the machine width direction among the plurality of connecting support members 151c. . A support shaft 156 extending in the machine width direction is attached to the top of the pillar 155L and the top of the pillar 155R.

The second support 152 has vertical supports 157L and 157R and a horizontal support 158 . The vertical support member 157L is connected to the left end of the front support member 151a and extends upward from the left end. The vertical support member 157R is connected to the right end of the front support member 151a and extends upward from the right end. The horizontal support member 158 extends in the machine width direction and connects the upper end portion of the vertical support member 157L and the upper end portion of the vertical support member 157R.

A position adjustment mechanism 230 is attached to the second support 152, and the chairs (the first front chair 187A and the second front chair 187B) are supported via the position adjustment mechanism 230. As shown in FIG. The configuration of the position adjustment mechanism 230 will be described later.
The connection body 153 has first connection members 153L1 and 153R1 and second connection members 153L2 and 153R2. The first connecting members 153L1 and 153R1 extend in the front-rear direction. The first connection member 153L1 connects the left portion of the toolbar 43 and the vertical support member 157L. The first connection member 153R1 connects the right portion of the toolbar 43 and the vertical support member 157R. A support shaft 159L projecting leftward is provided at the rear portion of the first connection member 153L1. A support shaft 159R projecting rightward is provided at the rear portion of the first connection member 153R1. The second connecting members 153L2 and 153R2 extend vertically. The second connection member 153L2 connects the left end portion of the rear support member 151b and the front portion of the first connection member 153L1. The second connection member 153R2 connects the right end portion of the rear support member 151b and the front portion of the first connection member 153R1.

As shown in FIGS. 2, 3, 12, and 13, the connecting link mechanism 44 includes a lower link (first lower link 44A, second lower link 44B), an upper link 44C, and a connecting member 44D. have. The connecting link mechanism 44 is composed of a parallel link mechanism.
The first lower link 44A and the second lower link 44B are arranged parallel to each other at the same height position. The upper link 44C is arranged above the first lower link 44A and the second lower link 44B. The first lower link 44A, the second lower link 44B, and the upper link 44C extend at the same inclination angle with respect to the horizontal plane so as to move upward toward the rear. The connecting member 44D extends in the machine width direction, and connects the front-rear middle portion of the first lower link 44A and the front-rear middle portion of the second lower link 44B.

The first lower link 44A connects the chair support 150 and the rotary tiller 2 on one end side (left side) of the tool bar 43 in the longitudinal direction (machine width direction K2). The second lower link 44B connects the chair support 150 and the rotary tiller 2 on the other end side (right side) of the tool bar 43 in the length direction (machine width direction K2). Specifically, the front end portion of the first lower link 44A is pivotally supported via a support shaft 161L on a left bracket 160L (see FIG. 13) fixed to the left portion of the rear support frame 13R of the rotary tiller 2. . A rear end portion of the first lower link 44A is pivotally supported on a spindle 159L (see FIGS. 12 and 13) of the chair support 150. As shown in FIG. A front end portion of the second lower link 44B is pivotally supported by a right bracket 160R (see FIG. 13) fixed to the right portion of the rear support frame 13R of the rotary tiller 2 via a support shaft 161R. A rear end portion of the second lower link 44B is pivotally supported on a spindle 159R (see FIGS. 12 and 13) of the chair support 150. As shown in FIG.

The upper link 44C connects the chair support 150 and the rotary tiller 2 at the center of the tool bar 43 in the longitudinal direction (machine width direction K2). Specifically, the front end of the upper link 44C is pivotally supported by a central bracket 160M (see FIG. 13) fixed to the upper portion of the transmission case 12 of the rotary tiller 2 via a support shaft 161M. The rear end of the upper link 44C is pivotally supported on the spindle 156 of the chair support 150. As shown in FIG.

In the working machine coupling mechanism 41 having the above configuration, when the lower links 44A and 44B swing up and down around the support shafts 161L and 161R by driving the lift drive device 42, the upper link 44C moves up and down around the support shaft 161M. swing to. As a result, the chairs (the first front chair 187A and the second front chair 187B) supported by the chair support 150 and the transplanter 3 move up and down integrally. Here, since the connecting link mechanism 44 is composed of a parallel link mechanism, the chairs 187A and 187B and the transplanter 3 move up and down parallel to the ground.

As shown in FIGS. 13 and 14, the elevation driving device 42 has an elevation cylinder (hydraulic actuator) C1. The elevating cylinder C1 is composed of a hydraulic cylinder having a cylinder body C1a and a piston rod C1b. A tip portion of the piston rod C1b is pivotally supported on the upper support shaft 162 . The upper support shaft 162 is attached to an intermediate portion in the front-rear direction of the upper link 44C. The bottom side of the cylinder body C1a is pivotally supported by the lower support shaft 163. As shown in FIG. As shown in FIGS. 6 and 15 , the lower support shaft 163 is attached to a shaft attachment member 164 . The shaft attachment member 164 has a front portion attached to the upper portion of the rear support frame 13R of the rotary machine frame 11, and a rear portion attached to the upper portion of the intermediate member 196C.

As shown in FIG. 14, when the elevating cylinder C1 is extended (the piston rod C1b is advanced from the cylinder body C1a), the upper link 44C and the lower links 44A and 44B swing upward and are supported by the chair support 150. The chairs (first front chair 187A and second front chair 187B) and transplanter 3 (machine frame 37) are raised. Further, when the elevating cylinder C1 is shortened (the piston rod C1b is retracted), the upper link 44C and the lower links 44A, 44B swing downward, and the chairs supported by the chair support 150 (the first front chair 187A and The second front chair 187B) and the transplanter 3 (machine frame 37) are lowered.

The lift drive device 42 is connected to a control valve 165 (see FIG. 35) that controls the lift cylinder C1. The control valve 165 is connected via a hydraulic hose to the cylinder body C1a of the lifting cylinder C1 and also to the hydraulic pump and hydraulic oil tank. A hydraulic pump and a hydraulic oil tank are mounted on the work implement 1 . By switching the flow of hydraulic fluid in the hydraulic fluid tank, the control valve 165 supplies hydraulic fluid to the bottom side of the cylinder body C1a to extend the elevating cylinder C1, or supplies hydraulic fluid to the rod side of the cylinder body C1a. can be supplied to shorten the lift cylinder C1.

The lift drive device 42 may be configured by an electric cylinder (electric actuator) or an electric hydraulic cylinder (electric hydraulic actuator). An electric cylinder is an electrically driven cylinder, for example, a cylinder that rotates a ball screw around its axis by an electric motor to move a ball screw nut, and advances and retreats a rod by the movement of the ball screw nut. An electric hydraulic cylinder is, for example, an actuator that integrates an electric motor, an oil tank, a hydraulic pump, a valve, a hydraulic cylinder, etc. When the electric motor rotates, the hydraulic pump rotates and the valve is switched to operate the hydraulic cylinder. is a cylinder.

Next, the machine frame 37 of the transplanter 3 will be described with reference to FIGS. 16 to 18. FIG.
Since the first machine frame 37A and the second machine frame 37B have the same configuration, only the first machine frame 37A will be described, and the second machine frame 37B will be omitted.
The machine frame 37 has a main frame 65 and a connection bracket 61 . A seedling supply device 38A, a planting device 39A, a soil covering device 40A, etc. are mounted on the main frame 65 of the first machine frame 37A, and a seedling supply device 38B, a planting device 39B, and a soil covering device are mounted on the main frame 65 of the second machine frame 37B. 40B etc. are installed.

The connection bracket 61 is a member that connects the main frame 65 to the toolbar 43 . The connection bracket 61 includes a mounting wall 61a that abuts on the upper surface of the tool bar 43 so as to be movable in the machine width direction K2, one side wall 61b that extends upward from the left end of the mounting wall 61a, and a wall that extends upward from the right end of the mounting wall 61a. It has an extended side wall 61c. The mounting wall 61a is fixed to the tool bar 43 by a fixture 77 having a U-bolt or the like. Therefore, by loosening the fixture 77, the position of the machine frame 37 in the machine width direction K2 can be changed (adjusted). That is, the connection bracket 61 can move along the tool bar 43 in the machine width direction K2.

As shown in FIG. 20, the connecting bracket 61 of the first machine frame 37A (hereinafter also referred to as "first fixture 61A") and the connecting bracket 61 of the second machine frame 37B (hereinafter also referred to as "second mounting fixture 61B"). ) are arranged side by side in the machine width direction K2. The first fixture 61A and the second fixture 61B are attached movably along the toolbar 43, respectively. This allows the first implantation unit 36A and the second implantation unit 36B to move along the toolbar 43 respectively. Since the first implantation unit 36A and the second implantation unit 36B are each movable along the toolbar 43, the distance between the first implantation unit 36A and the second implantation unit 36B can be adjusted.

That is, the transplanter 3 has an adjusting mechanism for adjusting the distance between the first transplanting unit 36A and the second transplanting unit 36B. Hereinafter, for convenience of explanation, this adjustment mechanism will be referred to as a "distance adjustment mechanism". The distance adjustment mechanism has a connection bracket 61 (first fixture 61A) for the first machine frame 37A and a connection bracket 61 (second fixture 61B) for the second machine frame 37B.
The main frame 65 has a plurality of frame members (first frame member 65a to nineteenth frame member 65t) formed of square pipes. The first frame member 65a constitutes the upper left portion of the main frame 65 and is arranged to extend in the front-rear direction K1. The second frame member 65b constitutes the upper right portion of the main frame 65 and is arranged to extend in the front-rear direction K1. The third frame member 65c connects the front portions of the first frame member 65a and the second frame member 65b. The fourth frame member 65d and the fifth frame member 65e connect rear portions of the first frame member 65a and the second frame member 65b. The fourth frame member 65d is positioned in front of the fifth frame member 65e. The sixth frame member 65f is arranged above the main frame 65 and substantially at the center in the machine width direction K2.

The sixth frame member 65f and the seventh frame member 65g are arranged to extend in the front-rear direction K1. The sixth frame member 65f is positioned above the main frame 65. As shown in FIG. The seventh frame member 65g is positioned below the main frame 65. As shown in FIG. The eighth frame member 65h connects the central portion of the third frame member 65c in the machine width direction K2 and the front end portion of the seventh frame member 65g. The nineteenth frame member 65t connects the second frame member 65b and the sixth frame member 65f. The nineteenth frame member 65t is arranged behind the third frame member 65c and in front of the fourth frame member 65d. The ninth frame member 65i connects the nineteenth frame member 65t and the seventh frame member 65g. The tenth frame member 65j connects the fourth frame member 65d and the seventh frame member 65g. The ninth frame member 65i is positioned in front of the tenth frame member 65j.

The eleventh frame member 65k is positioned between the first frame member 65a and the sixth frame member 65f and extends downward from the third frame member 65c. The twelfth frame member 65m is positioned between the second frame member 65b and the sixth frame member 65f and extends downward from the third frame member 65c. A connecting bracket 61 is arranged between the eleventh frame member 65k and the twelfth frame member 65m. One side wall 61b of the connecting bracket 61 is fixed to the eleventh frame member 65k, and the other side wall 61c is fixed to the twelfth frame member 65m.

The thirteenth frame member 65n extends downward from a rear portion of the first frame member 65a. The thirteenth frame member 65n is arranged parallel to the tenth frame member 65j. The fourteenth frame member 65o extends downward from the rear end of the first frame member 65a. The fifteenth frame member 65p extends downward from a rear portion of the second frame member 65b. The fifteenth frame member 65p is arranged parallel to the ninth frame member 65i. The sixteenth frame member 65q extends downward from the rear end of the second frame member 65b. The seventeenth frame member 65r connects the lower end portions of the fourteenth frame member 65o and the sixteenth frame member 65q. The eighteenth frame member 65s extends upward from the front portion of the seventh frame member 65g.

A first mounting plate 65u is fixed across the lower portion of the eleventh frame member 65k and the lower portion of the twelfth frame member 65m. A front plate 78La provided at the front of the first planting frame 78L is bolted to the left portion of the first mounting plate 65u. A front plate 78Ra provided at the front of the second planting frame 78R is bolted to the right portion of the first mounting plate 65u. A first planting device 39AL is attached to the first planting frame 78L. A first planting device 39AR is attached to the second planting frame 78R.

As shown in FIG. 18, an adjustment groove 66L and an adjustment hole 67L are provided on the left side of the first mounting plate 65u. The adjustment groove 66L is provided above the adjustment hole 67L. An adjustment groove 66R and an adjustment hole 67R are provided on the right portion of the first mounting plate 65u. The adjustment groove 66R is provided above the adjustment hole 67R.
Two adjustment grooves 66L are provided side by side with an interval in the machine width direction K2. The two adjustment grooves 66L are arranged along a downwardly convex arc-shaped line. A plurality of (five) adjustment holes 67L are provided side by side at intervals in the machine width direction K2.

A bolt B1 is inserted through each of the two adjustment grooves 66L, and the bolt B1 is inserted through a through hole in the upper portion of the front plate 78La and fastened with a nut. A bolt B2 is inserted through one of the plurality of adjustment holes 67L, and the bolt B2 is inserted through a through hole in the lower portion of the front plate 78La and fastened with a nut. That is, the front plate 78La is attached to the left portion of the first mounting plate 65u by a total of three points, two points (two bolts B1) at the top and one point (one bolt B2) at the bottom.

By moving the bolt B1 inserted through the adjustment groove 66L along the adjustment groove 66L and changing the adjustment hole 67L through which the bolt B2 is inserted among the plurality of adjustment holes 67L, the first mounting plate 65u The mounting angle of the first planting frame 78L with respect to can be changed (see left part of FIG. 18, phantom line and double-headed arrow in FIG. 19). Thereby, the mounting angle of the first planting device 39AL with respect to the first mounting plate 65u can be changed. In other words, the inclination angle of the first planting device 39AL with respect to the vertical line can be changed.

Two adjustment grooves 66R are provided side by side with an interval in the machine width direction K2. The two adjustment grooves 66R are arranged along a downwardly convex arc-shaped line. A plurality of (five) adjustment holes 67R are provided side by side at intervals in the machine width direction K2.
A bolt B3 is inserted through each of the two adjustment grooves 66R, and the bolt B3 is inserted through a through hole in the upper portion of the front plate 78Ra and fastened with a nut. A bolt B4 is inserted through one of the plurality of adjustment holes 78Ra, and the bolt B4 is inserted through a through hole in the lower portion of the front plate 78Ra and fastened with a nut. That is, the front plate 78Ra is attached to the right portion of the first mounting plate 65u by a total of three points, two points (two bolts B3) at the top and one point (one bolt B4) at the bottom.

By moving the bolt B3 inserted through the adjustment groove 66R along the adjustment groove 66R and changing the adjustment hole 67R through which the bolt B4 is inserted among the plurality of adjustment holes 67R, the first mounting plate 65u The attachment angle of the second planting frame 78R can be changed with respect to (see the virtual line and double-headed arrow on the right side of FIG. 18). Thereby, the mounting angle of the first planting device 39AR with respect to the first mounting plate 65u can be changed. In other words, the inclination angle of the first planting device 39AR with respect to the vertical line can be changed.

As described above, the adjustment grooves 66L, 66R and the adjustment holes 67L, 67R can be used to adjust the relative angle between the first planting device 39AL and the first planting device 39AR. In other words, the adjustment grooves 66L, 66R and the adjustment holes 67L, 67R form an angle adjustment mechanism ( hereinafter referred to as "first angle adjustment mechanism"). The first angle adjustment mechanism can individually adjust the mounting angles of the plurality of first planting devices (the first planting device 39AL and the first planting device 39AR) with respect to the first machine frame 37A.

The second machine frame 37B is also provided with an angle adjusting mechanism similar to the above-described first machine frame 37A. An angle adjustment mechanism (hereinafter referred to as a "second angle adjustment mechanism") provided in the second machine frame 37B can adjust the relative angle between the second planting device 39BL and the second planting device 39BR. That is, the second angle adjustment mechanism enables adjustment of the relative angle between the plurality of second planting devices (the second planting device 39BL and the second planting device 39BR). The second angle adjustment mechanism can individually adjust the mounting angles of the plurality of second planting devices (the second planting device 39BL and the second planting device 39BR) with respect to the second machine frame 37B.

According to the first angle adjustment mechanism, it is possible to adjust the interval (between rows) between the seedling planting position by the first planting device 39AL and the seedling planting position by the first planting device 39AR. According to the second angle adjustment mechanism, it is possible to adjust the interval (between rows) between the seedling planting position by the second planting device 39BL and the seedling planting position by the second planting device 39BR.
The first planting frame 78L and the second planting frame 78R may be attached to the machine frame 37 (first machine frame 37A, second machine frame 37B) so as to be positionally adjustable in the machine width direction K2. good.

As shown in FIGS. 16 to 18, a second mounting plate 65v is fixed across the lower portion of the tenth frame member 65j and the lower portion of the thirteenth frame member 65n. A third mounting plate 65w is fixed across the lower portion of the ninth frame member 65i and the lower portion of the fifteenth frame member 65p. The rear portion of the first soil covering device 40AL is attached to the second mounting plate 65v. The rear portion of the first soil covering device 40AR is attached to the third mounting plate 65w.

As shown in FIGS. 2 and 20, the working machine 1 includes a connecting frame 130 that connects the first transplanting unit 36A and the second transplanting unit 36B. As shown in FIG. 21, the connection frame 130 includes a first connection frame member 131, a second connection frame member 132, a third connection frame member 133, a fourth connection frame member 134, a fifth connection frame member 135, a sixth connection frame member 135, and a sixth connection frame member 135. It has a frame member 136 .

As shown in FIG. 20, the first connecting frame member 131 extends in the machine width direction and connects the rear part of the first machine frame 37A and the rear part of the second machine frame 37B. As shown in FIGS. 20 and 21, the second connecting frame member 132 is attached to the center upper surface of the first connecting frame member 131 in the machine width direction and extends upward from the upper surface. The third connecting frame member 133 extends forward from the middle portion of the second connecting frame member 132 in the vertical direction. The front of the third connecting frame member 133 is connected to the second support 152 of the chair support 150 . The fourth connection frame member 134 extends upward from a position closer to the front of the third connection frame member 133 . The fifth connecting frame member 135 connects the upper portion of the second connecting frame member 132 and the upper portion of the fourth connecting frame member 134 . The sixth connecting frame member 136 extends downward from the front side position of the third connecting frame member 133 . A lower end of the sixth connecting frame member 136 is attached to the upper portion of the toolbar 43 .

By connecting the first transplanting unit 36A and the second transplanting unit 36B with the connecting frame 130, the height of the first transplanting unit 36A and the height of the second transplanting unit 36B can be aligned. Therefore, the seedlings planted by the first transplanting unit 36A and the seedlings planted by the second transplanting unit 36B can be planted to the same depth. Moreover, the distance between the seedlings planted by the first transplanting unit 36A and the seedlings planted by the second transplanting unit 36B can be accurately adjusted.

As shown in FIGS. 21 to 23, the connecting frame 130 is attached with stands 137L and 137R. The stand 137L is attached to the left end of the first connecting frame member 131. As shown in FIG. The stand 137R is attached to the right end of the first connecting frame member 131. As shown in FIG. The stands 137L and 137R can be changed between a standing posture extending downward from the first connecting frame member 131 and a folded posture extending inward along the first connecting frame member 131 in the width direction of the machine. In FIGS. 21 and 22, the folded postures of the stands 137L and 137R are indicated by solid lines, and the standing postures thereof are indicated by phantom lines. FIG. 23 shows standing postures of the stands 137L and 137R.

By placing the stands 137L and 137R in a standing posture and grounding the lower ends of the stands 137L and 137R, the transplanter 3 can be supported while floating from the ground. Therefore, it is possible to easily store and transport the working machine 1, and attach/detach the transplanter 3 to/from the rotary tiller 2, and the like. The stands 137L and 137R are folded when performing work (transplantation work, etc.).

A housing body 166 housing a control valve 165 and the like is attached to the connecting frame 130 . The container 166 is attached to the upper portion of the third connecting frame member 133 and the front portion of the fourth connecting frame member 134 . A first operating lever 167 and a second operating lever 168 for operating the control valve 165 and the like protrude from the top of the container 166 .
Next, the power transmission mechanism 105 which transmits the power from the prime mover E1 to the seedling supply apparatus 38 and the planting apparatus 39 is demonstrated.

As shown in FIGS. 11 and 24, a seventh gear (bevel gear) G7 is provided at the rear end of the output shaft 32 that transmits power from the prime mover E1. The seventh gear G7 meshes with the eighth gear (bevel gear) G8. The eighth gear G8 is provided at one end (left end) of the main shaft 107 . As a result, the power from the prime mover E1 is transmitted from the output shaft 32 to the main shaft 107. As shown in FIG.

As shown in FIGS. 20 and 24, the main shaft 107 extends perpendicularly to the output shaft 32 in the machine width direction K2. As shown in FIG. 20, the main shaft 107 is provided over the first machine frame 37A and the second machine frame 37B. The main shaft 107 is composed of a plurality of shafts and a connecting shaft that interlocks and connects the shafts, and is capable of expanding and contracting according to the position adjustment of the machine frames 37A and 37B in the machine width direction K2. The main shaft 107 rotates by receiving power from the prime mover E<b>1 transmitted from the output shaft 32 . Power is transmitted from the main shaft 107 to the seedling supply device 38 and the planting device 39 of each transplantation unit 36A, 36B.

As shown in FIG. 11, the spindle 107 is provided with a first torque limiter 108 and a second torque limiter 109 . The first torque limiter 108 cuts off transmission of power (torque transmission) from the main shaft 107 to the first implantation unit 36A when an overload is applied to the first implantation unit 36A. The second torque limiter 109 cuts off power transmission (torque transmission) from the main shaft 107 to the second implantation unit 36B when an overload is applied to the second implantation unit 36B.

As shown in FIGS. 24 and 25, the main shaft 107 has rotating shafts (first rotating shaft 107A, second rotating shaft 107B, and third rotating shaft 107C) and connecting shafts 107L and 107R. The first rotating shaft 107A rotates by receiving power from the prime mover E1. The second rotating shaft 107B rotates by receiving power from the first rotating shaft 107A. The second rotating shaft 107B is composed of a left shaft 107B1 and a right shaft 107B2 connected by a coupling CP. The third rotating shaft 107C rotates by receiving power from the second rotating shaft 107B.

An eighth gear G8 that meshes with the seventh gear G7 is provided at the left end of the first rotating shaft 107A, and the first rotating shaft 107A receives power transmitted from the output shaft 32 and rotates. The connecting shaft 107L connects the right end of the first rotating shaft 107A and the left end of the second rotating shaft 107B. The connecting shaft 107R connects the right end of the second rotating shaft 107B and the left end of the third rotating shaft 107C.

107 A of 1st rotating shafts, the 2nd rotating shaft 107B, and 107 C of 3rd rotating shafts are spline shafts which have unevenness|corrugation in the circumferential direction. The connecting shafts 107L and 107R are cylindrical spline bearings with which the spline shafts mesh. The first rotating shaft 107A and the second rotating shaft 107B are movable in the width direction of the transplanter 3 (the same as the machine width direction K2) with respect to the connecting shafts 107L and 107R. In other words, the first rotating shaft 107A and the second rotating shaft 107B can move in the machine width direction K2 (leftward or rightward) by changing the length of the meshing portion with the connecting shafts 107L and 107R. As shown in FIG. 25, by moving the first rotating shaft 107A and the second rotating shaft 107B relative to the connecting shafts 107L and 107R in the machine width direction K2, the main shaft 107 can be extended and contracted in the machine width direction K2. That is, by sliding the spline shaft relative to the spline bearing, the main shaft 107 can be expanded and contracted in the machine width direction K2.

The outer periphery of the main shaft 107 is covered with a cover cylinder 110 extending in the machine width direction K2. The cover tube 110 is formed by rolling a flexible sheet (for example, a resin sheet) into a cylindrical shape. As shown in FIG. 26, the cover cylinder 110 is rounded so as to have an overlapping portion OL in the circumferential direction. The diameter of the cover tube 110 can be increased or decreased by changing the length of the overlapping portion OL. This makes it possible to accommodate main shafts 107 of various thicknesses. Further, the cover cylinder 110 can be opened without overlapping portions. Accordingly, after the main shaft 107 is mounted, the outer circumference of the main shaft 107 can be covered with the cover tube 110 .

As shown in FIG. 25, the cover tube 110 includes a plurality of cover tubes (first cover tube 110A, second cover tube 110B). The plurality of cover cylinders 110A and 110B are movable along the main shaft 107 in the machine width direction K2. The first cover cylinder 110A covers the outer periphery of the connecting shaft 107L. The second cover cylinder 110B covers the outer circumference of the connecting shaft 117R.
Since the outer circumference of the main shaft 107 is covered with the cover cylinder 110, the first rotating shaft 107A, the second rotating shaft 107B, the third rotating shaft 107C, and the connecting shafts 107L and 107R, which constitute the main shaft 107, are protected from the outside. be able to. In addition, since the cover cylinder 110 includes a plurality of cover cylinders 110 that are movable in the machine width direction along the main shaft 107, it is possible to accommodate expansion and contraction of the main shaft 107 in the machine width direction K2.

The power transmitted to the main shaft 107 (the first rotating shaft 107A, the second rotating shaft 107B, the third rotating shaft 107C, and the connecting shafts 107L and 107R) is transmitted to the first transplanting unit 36A and the second transplanting unit 36B via a transmission mechanism. is transmitted to As shown in FIG. 11, the transmission mechanism includes a first transmission mechanism 115a to a twelfth transmission mechanism 115m.
As shown in FIGS. 11, 24 and 27, the power transmitted to the main shaft 107 is transmitted to the first shaft 111 via the first transmission mechanism (chain winding transmission mechanism) 115a. Further, the power transmitted to the main shaft 107 is transmitted to the second shaft 112 via the second transmission mechanism (chain winding transmission mechanism) 115b.

The power transmitted to the first shaft 111 is transmitted to the first seedling supply device 38A via the third transmission mechanism (bevel gear transmission mechanism) 115c and the fourth transmission mechanism (chain winding transmission mechanism) 115d. The power transmitted to the second shaft 112 is transmitted to the second seedling supply device 38B via the fifth transmission mechanism (bevel gear transmission mechanism) 115e and the sixth transmission mechanism (chain winding transmission mechanism) 115f.

In addition, the power transmitted to the first shaft 111 is transmitted to the right first planting device 39AR via the seventh transmission mechanism (chain winding transmission mechanism) 115g, and the eighth transmission mechanism 115h and the third shaft 113, transmitted to the left first planting device 39AL via the ninth transmission mechanism 115i. The power transmitted to the second shaft 112 is transmitted to the right second planting device 39BR via the tenth transmission mechanism (chain winding transmission mechanism) 115j, and the eleventh transmission mechanism 115k, fourth shaft 114, It is transmitted to the left second planting device 39BL via the twelfth transmission mechanism 115m.

Next, the planting device 39 will be described.
Since the first planting device 39A and the second planting device 39B are similarly configured, the structure of the first planting device 39A illustrated in FIGS. A description of the structure is omitted. In addition, since the left first planting device 39AL and the right first planting device 39AR are configured in the same manner except that they are bilaterally symmetrical, description of common parts will be omitted.

As shown in FIGS. 27 and 28, the first planting device 39AL and the first planting device 39AR are arranged side by side in the machine width direction K2 and at different positions in the front-rear direction K1. The first planting device 39AL is attached to the first planting frame 78L and the first planting device 39AR is attached to the second planting frame 78R.
The first planting device 39AL has a planting tool 64 and a planting lift mechanism 139 . The first planting device 39AR has a planting tool 64 and a planting elevating mechanism 139, similar to the first planting device 39AL.

Hereinafter, the planting tool 64 in the first planting device 39AL may be referred to as the planting tool 64AL, and the planting tool 64 in the first planting device 39AR may be referred to as the planting tool 64AR. Also, the planting lifting mechanism 139 in the first planting device 39AL may be referred to as the planting lifting mechanism 139AL, and the planting lifting mechanism 139 in the first planting device 39AR may be referred to as the planting lifting mechanism 139AR.
The planting tool 64 is a member for planting seedlings in a field (ridge). The planter 64 has a beak shape with a downward tip (see FIG. 27) and has a front structure 140 and a rear structure 141 . The planting tool 64 can be opened and closed by moving the front structure 140 and the rear structure 141 away from each other in the front-rear direction K1. The front structure 140 and the rear structure 141 are biased in the closing direction by a tension spring.

As shown in FIG. 27, the seventh transmission mechanism 115g includes a driving sprocket 116R that rotates integrally with the first shaft 111, a driven sprocket 117R that is supported by the first planting frame 78R via a spindle 118R, and a driving sprocket. 116R and a chain 119R wound over the driven sprocket 117R. Power is transmitted from the first shaft 111 to the support shaft 118R by the seventh transmission mechanism 115g to rotate the support shaft 118R.

The ninth transmission mechanism 115i includes a drive sprocket 116L that rotates integrally with the third shaft 113, a driven sprocket 117L that is supported by the second planting frame 78L via a support shaft 118L, and extends across the drive sprocket 116L and the driven sprocket 117L. It has a chain 119L wrapped around it. Power is transmitted from the third shaft 113 to the support shaft 118L by the ninth transmission mechanism 115i to rotate the support shaft 118L.

The tenth transmission mechanism 115j is configured similarly to the seventh transmission mechanism 115g. Power is transmitted from the second shaft 112 to the support shaft 118R of the right second planting device 39BR by the tenth transmission mechanism 115j, and the support shaft 118R of the second planting device 39BR rotates.
The twelfth transmission mechanism 115m is configured similarly to the ninth transmission mechanism 115i. Power is transmitted from the fourth shaft 114 to the support shaft 118L of the left second planting device 39BL by the 12th transmission mechanism 115m, and the support shaft 118L of the second planting device 39BL rotates.

As shown in FIGS. 27 and 28 , the planting lifting mechanism 139 is a device that supports the planting tool 64 and lifts the planting tool 64 . Specifically, the planting elevating mechanism 139AL is a device for elevating the planting tool 64AL, and the planting elevating mechanism 139AR is a device for elevating the planting tool 64AR.
The lifting mechanism 139 with planting has a first case 120 , a second case 121 and a mounting member 122 . The first case 120 of the planting lifting mechanism 139L is rotatably supported by the first planting frame 78L via a spindle 118L. The first case 120 of the planting lifting mechanism 139R is rotatably supported by the second planting frame 78R via a spindle 118R. The second case 121 is rotatably supported on the free end side of the first case 120 . The mounting member 122 is supported by the second case 121 . Mounting member 122 supports planter 64 .

The first case 120 and the second case 121 rotate as the support shafts 118L and 118R rotate. Inside the first case 120 and the second case 121, when the first case 120 rotates in one direction around the horizontal axis, the second case 121 and the first case 120 move in conjunction with the rotation of the first case 120. A power transmission device is provided to rotate in the opposite direction (the other around the horizontal axis).

By rotating the first case 120 and the second case 121, the mounting member 122 moves back and forth while parallelly moving up and down, and the planting tool 64 moves up and down while drawing an elliptical trajectory that is elongated in the vertical direction. (lifting).
Seedlings are dropped and supplied to the planting tool 64 at an elevated position (top dead center position). At this time, the planting tool 64 is in a closed state, and the seedling is contained and held inside the planting tool 64 . After that, the planting tool 64 descends while holding the seedling, and the lower portion plunges into the field. Also, the planting tool 64 opens when it rushes into the field, forms a planting hole in the field, and releases the seedlings by dropping them in the open state. Thereby, seedlings are planted in the field.

In the planting device 39 configured as described above, the planting tool 64 reciprocates up and down once when the support shafts 118L and 118R rotate once.
The first planting device 39AL and the first planting device 39AR are arranged side by side in the width direction K2 and at different positions in the front-rear direction K1. As a result, two rows of seedlings are planted on the ridge in a staggered manner by one transplanting unit (one of the seedlings adjacent in the width direction K2 of the machine is planted while being shifted forward and backward with respect to the other).

In this embodiment, the left and right planters 64 are raised and lowered simultaneously. Also, when the planter 64 stops, the left and right planters 64 stop at the top dead center position.
As shown in FIG. 11, the transplanter 3 has a plurality of assist devices 123. As shown in FIG. The plurality of assisting devices 123 includes a first assisting device 123A provided on the first implantation unit 36A and a second assisting device 123B provided on the second implantation unit 36B. The assist device 123 is a device that assists the lifting operation of the planting tool 64 . The assist device 123 has an assist spring that urges the planting tool 64 in the upward direction. By having the assist device 123, even if the electromagnetic clutch 24 is disconnected before the top dead center, it is possible to prevent the planting tool 64 from moving in reverse to the top dead center due to inertia.

Next, the soil covering device 40 will be described.
Since the structures of the first soil covering device 40A and the second soil covering device 40B are configured in the same manner, the first soil covering device 40A will be described, and the description of the structure of the second soil covering device 40B will be omitted.
Also, since the structures of the first soil covering device 40AL and the first soil covering device 40AR are configured in the same manner, the structure of the first soil covering device 40AL will be described, and the description of the structure of the first soil covering device 40AR will be omitted.

As shown in FIGS. 29 to 32, the first earth covering device 40AL includes a plurality of earth covering devices (first earth covering device 81L, second earth covering device 81R) and a support frame 82 that supports the earth covering devices 81L and 81R. have. In the case of this embodiment, the earth-covering devices 81L and 81R are earth-covering rings. It will be described as 81R.
The earth covering rings 81L and 81R rotate in contact with the upper surface of the farm field (ground) behind the planting tool 64, cover the roots of the planted seedlings with soil, and suppress the roots of the seedlings.

The soil covering ring 81L and the soil covering ring 81R are independently vertically movable, and move vertically following irregularities in the field. When the planting device 39 is positionally adjustable in the machine width direction K2, the soil covering device 40 is configured to be positionally adjustable in the machine width direction K2.
The soil covering ring 81L and the soil covering ring 81R function as a detection member 83 that detects the height of the machine frame 37 with respect to the ground. The ground height of the machine frame 37 is the relative height of the lower end of the machine frame 37 to the planting surface on which seedlings are planted. The planting surface is the field surface leveled by the rear cover 19B of the rotary tiller 2 . When ridges are formed in the field, the planting surface is the upper surface of the ridges.

The detection member 83 (covering soil wheel 81L and covering soil wheel 81R) is attached to the rear portion of a support frame 82 supported by the machine frame 37 so as to be vertically swingable. The support frame 82 supports the detection member 83 so as to be vertically movable with respect to the machine frame 37 . The support frame 82 is provided with a cylindrical boss 84 having an axis in the machine width direction K2 at its front portion. The boss 84 is supported by a support rod 85 provided on the machine frame 37 . The support rod 85 has an axis extending in the machine width direction K2, and is supported via bearings by a support member 86 extending downward from the seventh frame member 65g. The support rod 85 is rotatable around an axis extending in the machine width direction K2. The boss 84 is fitted on the outer circumference of the support rod 85 and is rotatable around the axis together with the support rod 85 . The boss 84 is fitted to the support rod 85 so as to be movable in the machine width direction K2. As a result, the support frame 82 can swing up and down, and its position can be adjusted in the machine width direction K2. As the support frame 82 swings up and down, the detection member 83 can move up and down.

The boss 84 can be fixed to the support rod 85 by a fixture at any position in the machine width direction K2. Specifically, the support rod 85 is provided with a plurality of through holes 85a spaced apart in the machine width direction K2, and fasteners (pins) 87 are inserted into the through holes 85a on the left and right sides of the boss 84, respectively. By doing so, the position of the boss 84 in the machine width direction can be determined. By changing the position of the boss 84 in the machine width direction and changing the position of the through hole 85a into which the fixing tool (pin) 87 is inserted, the position of the boss 84 in the machine width direction can be changed and positioned. can be done. By changing the position of the boss 84 in the machine width direction, the position of the front portion of the support frame 82 can be adjusted in the machine width direction. Hereinafter, a mechanism for adjusting the position of the front portion of the support frame 82 in the width direction of the machine will be referred to as a "front position adjusting mechanism".

As shown in FIGS. 30 to 32, the support frame 82 is arranged to pass over the detection member 83 (covering soil ring 81L and covering soil ring 81R). The support frame 82 has a left rear portion 82a arranged above the soil covering ring 81L and extending in the front-rear direction, and a right rear portion 82b arranged above the soil covering ring 81R and extending in the front-rear direction. A cover soil ring 81L is attached to the left rear portion 82a via an attachment plate 88L. A cover soil ring 81R is attached to the right rear portion 82b via an attachment plate 88R.

The support frame 82 also has a connecting portion 82c that connects the rear portion of the left rear portion 88a and the rear portion of the right rear portion 88b, and a front portion 82d that extends forward from the left rear portion 88a.
A rod member 90 is attached to the connecting portion 82c via attachment stays 89U and 89D. The attachment stay 89U is attached to the lower portion of the rod member 90. As shown in FIG. The attachment stay 89D is attached to the connecting portion 82c. A lower shaft 91 extending in the machine width direction K2 is attached to the attachment stays 89U and 89D. A lower portion of the rod member 90 is rotatably supported around the axis of the lower shaft 91 . An upper portion of the rod member 90 is inserted through a through hole provided in an upper shaft 92 arranged above the lower shaft 91 . The upper shaft 92 is supported by a shaft support member 93 attached to the second mounting plate 65v, and is rotatable about the axis in the machine width direction. The rod member 90 tilts and moves up and down as the detection member 83 moves up and down.

As shown in FIGS. 33 and 34, a second mounting plate 65v provided on the first machine frame 37A is provided with a plurality of through holes 68 spaced apart in the machine width direction. The pivot member 93 is attached to the second mounting plate 65v with a bolt B5 inserted through the through hole 68. As shown in FIG. By changing (shifting) the position of the through-hole 68 through which the bolt B5 is inserted in the machine width direction K2, the position of the shaft support member 93 with respect to the second mounting plate 65v can be changed in the machine width direction. 34, the positions of the rear portions of the rod members 90 and the support frame 82 can be adjusted in the machine width direction K2. Hereinafter, a mechanism for adjusting the position of the rear portion of the support frame 82 in the width direction of the machine will be referred to as a "rear position adjusting mechanism".

The front position adjustment mechanism and the rear position adjustment mechanism constitute an adjustment section (first position adjustment section) that adjusts the position of the first soil covering device 40A in the machine width direction K2. That is, the transplanter 3 has an adjuster (first position adjuster) that adjusts the position of the first soil covering device 40A in the machine width direction. In addition, the transplanter 3 has an adjustment section (second position adjustment section) that adjusts the position of the second soil covering device 40B in the machine width direction. Since the configuration of the second position adjusting section is the same as that of the first position adjusting section, the description thereof is omitted.

As shown in FIG. 33 and the like, a weight 94 is placed on the mounting stay 89U. The rod member 90 penetrates through the weight 94 . The weight 94 pushes the rear portion (connection portion 82c) of the support frame 82 downward to ground the detection member 83 (covering soil rings 81L and 81R).
As shown in FIGS. 29 and 31, the front end of the front portion 82d of the support frame 82 is attached to the boss 84 via the mounting plate 95. As shown in FIG. As a result, the support rod 85 rotates around the axis as the support frame 82 swings up and down. A first rocking plate 96 is attached to the support rod 85 . The rear portion of the first swing plate 96 is fixed to the support rod 85, and the front portion swings up and down as the support rod 85 rotates (see FIG. 30).

As shown in FIG. 32 , one end (lower end) of a wire (cable) 97 is connected to the front portion of the first rocking plate 96 . The wire 97 is covered with an outer shell 98 at a middle portion except for one end and the other end, and is movable (advanceable and retractable) along the outer shell 98 . One end (lower end) of the outer shell 98 is fixed to a front projection member 99 that projects forward from the support member 240 . One end of the wire 97 protrudes from one end of the outer shell 98 and is connected to the front portion of the first rocking plate 96 .

The first rocking plate 96 to which the wire 97 is connected may be provided on either the support rod 85 that supports the first soil covering device 40A or the support rod 85 that supports the second soil covering device 40B. . That is, only one wire 97 is sufficient regardless of the number of soil covering devices.
As shown in FIG. 35 , the other end (upper end) of the outer shell 98 is fixed to the second rocking plate 100 housed in the housing 166 . The second rocking plate 100 is connected to the lower end of the first operating lever 167 . The first operating lever 167 protrudes upward from a groove 166a (see FIG. 21) formed in the upper portion of the container 166, and can swing back and forth along the groove 166a. The first operating lever 167 can selectively stop at a plurality of positions in the front-rear direction along the groove 166a. By stopping the first operating lever 167, the position of the second rocking plate 100 and the position of the other end of the outer shell 98 are determined.

As shown in FIG. 35, the other end (upper end) of the wire 97 protrudes from the other end of the outer shell 98 and is connected to the swinging piece 165a of the control valve 165 housed in the housing 166. . The swinging piece 165 a is connected to the spool of the control valve 165 . As the swinging piece 165a swings, the spool of the control valve 165 moves to switch the flow of hydraulic oil. As a result, hydraulic oil is supplied to the bottom side or the rod side of the cylinder body C1a, and the elevating cylinder C1 extends or shortens.

When the detecting member 83 (soil covering wheels 81L, 81R) moves up and down following the unevenness of the field, the support frame 82 moves up and down, and the bosses 84 and the support rods 85 rotate about their axes in the machine width direction. As a result, the front portion of the first rocking plate 96 moves up and down, and the wire 97 moves upward or downward. As the wire 97 moves, the control valve 165 switches the elevation drive device 42 between a first state in which the machine frame 37 is raised and a second state in which the machine frame 37 is lowered. Specifically, when the detecting member 83 moves upward, the wire 97 moves upward, the control valve 165 shortens the lifting cylinder C1 of the lifting drive device 42, and the machine frame 37 (transplanter 3) rises. When the detecting member 83 moves downward, the wire 97 moves downward, the control valve 165 extends the lifting cylinder C1 of the lifting drive device 42, and the machine frame 37 (transplanter 3) descends. As a result, it is possible to prevent variations in planting depth of seedlings due to irregularities in the field.

Further, as shown by a phantom line in FIG. 36, by swinging the first operating lever 167 in the front-rear direction, the second swing plate 100 swings in the vertical direction. As the second rocking plate 100 rocks, the position of the other end of the outer shell 98 fixed to the second rocking plate 100 can be changed in the vertical direction. As a result, the relative positional relationship between the detection member 83 and the wire 97 changes, so that the amount of movement of the wire 97 caused by the vertical movement of the detection member 83 can be adjusted. Therefore, the planting depth set based on the detection result by the detection member 83 can be changed. That is, by swinging the first control lever 167, the planting depth (the relationship between the height of the detecting member 83 and the planting depth) based on the detection result by the detecting member 83 can be changed.

More specifically, the planting depth is set in advance according to the detection result (the height of the detection member 83 ) by the detection member 83 , and the detection result by the detection member 83 is determined by the amount of movement of the wire 97 . Therefore, the first operating lever 167 is swung to change the reference position of the movement of the wire 197 (the position of the outer shell 98), thereby increasing or decreasing the amount of movement of the wire 97 accompanying the vertical movement of the detection member 93 (the detection member By changing the correspondence relationship between the magnitude of vertical movement of 83 and the amount of movement of wire 97, the planting depth corresponding to the vertical movement of detection member 93 can be changed.

Further, as shown in FIG. 35, a third rocking plate 169 is attached to the lower end of the second operating lever 168 . The third rocker plate 169 is connected to the spool of control valve 165 via wire 170 . By swinging the second control lever 168 in the front-rear direction, the control valve 165 is also actuated to move the lift drive device 42 between the first state in which the machine frame 37 is raised and the second state in which the machine frame 37 is lowered. You can switch.

Elevation control of the transplanter 3 according to the unevenness of the field is performed independently of the rotary tiller 2 attached to the rear portion of the tractor 1A. Thereby, planting accuracy of seedlings can be improved.
Next, the seedling supply device 38 will be described.
As shown in FIG. 3, the seedling supply device 38 is arranged above the first planting device 39A and the second planting device 39B. Specifically, the first seedling supply device 38A is arranged above the first planting device 39A. The second seedling supply device 38B is arranged above the second planting device 39B.

The seedling supply device 38 is a device that drops and supplies seedlings to a planting tool 64 positioned below the seedling supply device 38 .
Since the first seedling supply device 38A and the second seedling supply device 38B have the same configuration, the structure of the first seedling supply device 38A will be illustrated in FIGS. is omitted.

As shown in FIGS. 3, 20 and 37, the first seedling supply device 38A has a device frame 176 supported by the first machine frame 37A. Similarly, the second seedling supply device 38B also has a device frame 176 supported by the second machine frame 37B.
As shown in FIGS. 20 and 37, the seedling supply device 38 has a large number of supply cups 171 and 172 into which seedlings are fed. The multiple supply cups include multiple first supply cups 171 and multiple second supply cups 172 . In the case of this embodiment, there are eleven first supply cups 171 and eleven second supply cups 172, and the total number of supply cups is twenty-two. The first supply cup 171 and the second supply cup 172 are arranged along a loop-shaped transfer route R1 extending in the front-rear direction K1.

Specifically, the first supply cup 171 and the second supply cup 172 are arranged side by side in a loop shape so as to have an oval shape elongated in the front-rear direction K1 in a plan view. Also, the first supply cups 171 and the second supply cups 172 are alternately arranged along the oval transfer route R1.
As shown in FIG. 20, the arrangement of the supply cups (the first supply cup 171 and the second supply cup 172) of the first seedling supply device 38A and the supply cups (the first supply cup 171 and the second supply cup 172) of the second seedling supply device 38B. The arrangement of the two supply cups 172) is symmetrical across the center line in the machine width direction K2.

As shown in FIG. 37, the first supply cup 171 and the second supply cup 172 are intermittently transported along the transport path R1 by the transport mechanism 177 in the arrow Y1 direction. The transfer mechanism 177 has a first rotating body 178 , a second rotating body 179 and a cord body 180 . The first rotating body 178 and the second rotating body 179 are composed of sprockets, and the cable body 180 is composed of an endless (loop-shaped) chain wound over the first rotating body 178 and the second rotating body 179. ing. The first rotating body 178 and the second rotating body 179 are supported by the apparatus frame 176 so as to be rotatable about the vertical axis (the axis extending in the vertical direction). The first supply cup 171 and the second supply cup 172 are arranged on the outer peripheral side of the cord body 180 along the cord body 180 .

As shown in FIGS. 11 and 24, the first rotating body 178 rotates as power is transmitted through the third transmission mechanism 115c and the fourth transmission mechanism 115d. As a result, the cable 180, the first supply cup 171 and the second supply cup 172 move in the arrow Y1 direction (see FIG. 37). In addition, as shown in FIG. 11, power is transmitted to the first rotating body 178 of the second seedling supply device 38B via the fifth transmission mechanism 115e and the sixth transmission mechanism 115f.

As shown in FIG. 41, the first supply cup 171 includes a storage portion 181a that stores seedlings N1 to be fed, an attachment portion 182a that is attached to the cord body 180, and a lid 183a that closes the opening at the lower end of the storage portion 181a. have The second supply cup 172 similarly has a housing portion 181b, a mounting portion 182b, and a lid 183b. The lids 183a and 183b are pivotally supported by hinges on the lower portions of the storage portions 181a and 181b to open and close the lower end openings of the storage portions 181a and 181b. By closing the lids 183a and 183b, the seedling N1 can be held in the storage portions 181a and 181b. Moreover, the seedling N1 can be discharged downward from the storage portions 181a and 181b by opening the lids 183a and 183b.

As shown in FIG. 38, the lid 183a of the first supply cup 171 has a first engaging portion 184a. The lid 183b of the second supply cup 172 has a second engaging portion 184b. The first engaging portion 184a protrudes to the inner peripheral side of the transfer route R1 (the cord body 180) of the supply cups 171 and 172. As shown in FIG. The second engaging portion 184b protrudes to the outer peripheral side of the transfer route R1 (rope 180) of the supply cups 171 and 172. As shown in FIG.

As shown in FIG. 37, the lid 183a of the first supply cup 171 opens on the left side of the transfer route R1. The first supply cup 171 indicated by reference numeral OP1 is the first supply cup 171 with the lid 183a open. The position indicated by D1 is the first open position (open position on one side in the machine width direction) where the lid 183a of the first supply cup 171 is opened. The lid 183b of the second supply cup 172 opens on the right side of the transfer route R1. The second supply cup 172 indicated by reference numeral OP2 is the second supply cup 172 with the lid 183b open. A position indicated by reference symbol D2 is a second open position (an open position on the other side in the machine width direction) where the lid 183b of the second supply cup 172 is opened. FIG. 40 shows a state in which the lid 183b is opened at the second open position D2.

The first open position D1 and the second open position D2 are seedling dropping positions where the seedlings are dropped onto the planting tool 64 and supplied. That is, the seedling supply device 38 has a seedling dropping position, which is a position where the seedlings are dropped onto the planting tool 64 and supplied, in the middle of the transfer route R1 in the front-rear direction.
As shown in FIG. 37, the first open position D1 and the second open position D2 are set at different positions in the front-rear direction K1. In this embodiment, the first open position D1 is rearwardly displaced from the second open position D2. The left implantation device in each implantation unit is rearwardly offset relative to the right implantation device corresponding to the rearward offset of the first open position D1 relative to the second open position D2. ing.

As shown in FIG. 38, the seedling supply device 38 has a setting member 185 for setting the open positions of the supply cups 171 and 172 (the first open position D1 and the second open position D2 can be set). The setting member 185 includes a plurality of regulating rods (first regulating rod 186a to sixth regulating rod 186f).
The first restricting rod 186a contacts the lower surfaces of the lids 183a and 183b on the front side of the first open position D1 and the second open position D2. Therefore, the first restricting rod 186a restricts opening of the lids 183a and 183b on the front side of the first open position D1 and the second open position D2. The second restricting rod 186b contacts the lower surfaces of the lids 183a and 183b on the rear side of the first open position D1 and the second open position D2. Therefore, the second restricting rod 186b restricts opening of the lids 183a and 183b behind the first open position D1 and the second open position D2.

The third restricting rod 186c contacts the first engaging portion 184a of the lid 183a on the front side of the first open position D1. Thereby, the third restricting rod 186c restricts the opening of the lid 183a on the front side of the first open position D1. The fourth restricting rod 186d contacts the second engaging portion 184b of the lid 183b on the rear side of the second open position D2. Thereby, the fourth restricting rod 186d restricts the opening of the lid 183b on the rear side of the second open position D2.

The fifth restricting rod 186e is located on the left side of the first open position D1 and contacts the second engaging portion 184b of the lid 183b in the first open position D1. This restricts the opening of the lid 183b at the first open position D1. Also, the lid 183a is allowed to open at the first open position D1. The sixth restricting rod 186f is located on the left side of the second open position D2 and contacts the first engaging portion 184a of the lid 183a in the second open position D2. This restricts the opening of the lid 183a at the second open position D2. Also, the lid 183b is allowed to open at the second open position D2.

As shown in FIG. 41, the planting tool 64 is positioned below the first open position D1. N1 is supplied. The planting tool 64 is also positioned below the second open position D2, and when the lid 183b opens and the seedling N1 falls, the seedling N1 is supplied to the planting tool 64 via the intermediate hopper 126. .

As shown in FIG. 37, the first seedling supply device 38A has a device frame 176 that supports a transfer mechanism 177. As shown in FIG. The device frame 176 is fixed to the top of the first machine frame 37A. The device frame 176 has a left rod 176a, a right rod 176b, a base rod 176c, front rods 176d and 176e, rear rods 176f and 176g, intermediate rods 176h and 176i, and curved bodies 176j and 176k.

The left rod 176a extends in the front-rear direction on the left side of the first seedling supply device 38A. The right rod 176b extends in the front-rear direction on the right side of the first seedling supply device 38A. The base rod 176c extends in the front-rear direction between the left rod 176a and the right rod 176b. The front rods 176d and 176e extend in the machine width direction at the front portion of the first seedling supply device 38A. The front rod 176d connects the front portion of the base rod 176c and the front portion of the left rod 176a. The front rod 176e connects the front portion of the base rod 176c and the front portion of the right rod 176b. The rear rods 176f and 176g extend in the machine width direction at the rear of the first seedling supply device 38A. The rear rod 176f connects the rear portion of the base rod 176c and the rear portion of the left rod 176a. The rear rod 176g connects the rear portion of the base rod 176c and the rear portion of the right rod 176b. A front end portion of the base rod 176c is located forward of the front rods 176d and 176e. A rear end portion of the base rod 176c is located behind the rear rods 176f and 176g.

The intermediate rod 176h connects the forward portion of the base rod 176c and the forward portion of the left rod 176a. The intermediate rod 176i connects the rear portion of the base rod 176c and the rear portion of the right rod 176b. The curved bodies 176j and 176k are U-shaped in plan view. The curved body 176j is arranged in the front part of the device frame 176, and the open side of the U-shape faces rearward. The curved body 176k is arranged in the rear part of the device frame 176, and the open side of the U-shape faces forward. The curved bodies 176j and 176k are provided on the outer peripheral side of the transfer route R1 (rope 180) of the supply cups 171 and 172. As shown in FIG. A front portion of the curved body 176j is fixed to a front standing body 176m erected on the front end portion of the base rod 176c. The rear part of the curved body 176k is fixed to a rear erected body 176n erected on the rear end of the base rod 176c.

A first rotating body 178 is supported on the front portion of the base rod 176c so as to be rotatable about a vertical axis (an axis extending in the vertical direction). A second rotor 179 is rotatably supported around the vertical axis at the rear portion of the base rod 176c. A first idler 251 is rotatably supported around the vertical axis on the left side of the front rod 176d. A second idler 252 is rotatably supported around the vertical axis on the right side of the front rod 176e. A third idler 253 is rotatably supported around the vertical axis on the left portion of the rear rod 176f. A fourth idler 254 is rotatably supported around the vertical axis on the right side of the rear rod 176g. A fifth idler 255 is rotatably supported around the vertical axis on the left side of the intermediate rod 176h. A sixth idler 256 is rotatably supported around the vertical axis on the right side of the intermediate rod 176i. The first idler 251 to sixth idler 256 are composed of sprockets. The sprocket rotates while meshing with the chain that forms the cable 180 .

The first idler 251 to sixth idler 256 constitute a tension imparting body that imparts tension to the cord 180 wound over the first rotating body 178 and the second rotating body 179 . The tension applying bodies (first idler 251 to sixth idler 256) apply tension toward the outer circumference of the cord body 180 so that the cord body 180 does not loosen. Of the tensioning bodies, the fifth idler 255 and the sixth idler 256 apply tension to the cord body 180 at the open positions D1, D2 of the lids 183a, 183b. Specifically, the fifth idler 255 applies tension to the cord body 180 in the first open position D1. The sixth idler 256 applies tension to the cord body 180 in the second open position D2.

As shown in FIGS. 37, 39, and 40, the transfer mechanism 177 has a guide member 173 that guides the movement of the cable 180. As shown in FIGS. The guide member 173 includes first guide members 174L, 174R and a second guide member 175. As shown in FIG.
The first guide members 174L, 174R are arranged on the outer peripheral side of the transfer route R1 (rope 180) of the supply cups 171, 172. As shown in FIG. The first guide members 174L, 174R are attached to the device frame 176. As shown in FIG. Specifically, the first guide member 174L is attached to the upper portion of the left rod 176a of the device frame 176 and extends in the front-rear direction along the left rod 176a. The first guide member 174R is attached to the upper portion of the right rod 176b of the device frame 176 and extends in the front-rear direction along the right rod 176b.

The first guide members 174L, 174R have extended surfaces 174La, 174Ra extending along the movement direction of the cord body 180 . In this embodiment, the extended surfaces 174La and 174Ra extend along the front-rear direction K1. The extension surface 174La is a surface facing rightward. The extension surface 174Ra is a surface facing leftward. The extension surface 174La and the extension surface 174Ra are arranged in parallel and facing each other.

A cover 176o covers the upper side and the machine width outer side (left side) of the first guide member 174L. The cover 176o is attached to the left rod 176a. A cover 176p covers the upper side and the machine width outer side (right side) of the first guide member 174R. The cover 176p is attached to the right rod 176b.
The second guide member 175 is attached to the cord body 180 and moves together with the cord body 180 . The second guide member 175 has a mounting portion 175a, a contact portion 175b, and a connecting portion 175c. The attachment portion 175a has an inner portion 175a1 and an outer portion 175a2. The internal site 175a1 is attached to the top of the cord body 180 via a pin PN. The pin PN extends upward from the cable body 180, and the inner portion 175a1 has a hole through which the pin PN is inserted. The outer portion 175a2 is arranged outside the inner portion 175a1 (the side farther from the supply cups 171 and 172 than the inner portion 175a1). The outer portion 175a2 and the inner portion 175a1 are in contact (surface contact) or connected to each other. That is, the outer portion 175a2 and the inner portion 175a1 may be integrated or separated.

The contact portion 175b is arranged on the outer peripheral side of the cord 180, and sequentially contacts the first guide member 174L and the first guide member 174R as the cord 180 rotates. In other words, the contact portion 175b moves while contacting the extended surfaces 174La and 174Ra of the first guide members 174L and 174R. The connection portion 175c connects the attachment portion 175a and the contact portion 175b. The external portion 175a2, the contact portion 175b and the connecting portion 175c are integrally formed.

The second guide member 175 is arranged corresponding to each of the supply cups 171 and 172 . That is, the number of second guide members 175 and the number of supply cups 171 and 172 are equal. The attachment portion 175a of the second guide member 175 is arranged on the inner peripheral side (on the cord body 180 side) of the corresponding supply cup 171 (or 172). The contact portion 175b of the second guide member 175 is arranged on the outer peripheral side (the side opposite to the cable 180 side) of the corresponding supply cup 171 (or 172). The connecting portion 175c is arranged from the inner peripheral side to the outer peripheral side of the corresponding supply cup 171 (or 172). The shape of the second guide member 175 can be changed, and the second guide member 175 may be formed integrally with the supply cups 171 and 172 . For example, a flange-shaped extension may be formed on the outer periphery of the supply cups 171 and 172 and the extension may be used as the second guide member 175 .

The contact portion 175b of the second guide member 175 and the extended surfaces 174La and 174Ra of the first guide member 174L and the first guide member 174R contact each other to prevent the cable body 180 from swinging in the machine width direction and loosening. can be prevented. Further, as shown in FIG. 42, the contact portion 175b of the second guide member 175 and the extended surfaces 174La and 174Ra of the first guide member 174L and the first guide member 174R are in contact with each other (surface contact). do). Therefore, it is possible to suppress the swing and slack of the cable body 180 in the machine width direction and the swing and slack of the cable body 180 in the vertical direction.

When the cable body 180 swings or loosens in the vertical direction, the contact portion 175b is inclined (high or low) with respect to the attachment portion 175a. are in surface contact with each other, the contact portion 175b cannot be inclined. Therefore, it is possible to suppress the swaying and loosening of the cable body 180 in the vertical direction.
The guide member 173 guides the movement of the cable 180 at least in the open positions of the lids 183a and 183b. Specifically, the first guide member 174L guides the movement of the cable 180 at least at the open position (first open position D1) of the lid 183a. The first guide member 174R guides the movement of the cable 180 at least at the lid 183b (second open position D2). In other words, the guide member 173 guides the cord 180 along the movement direction when the cord 180 moves through the open positions D1 and D2 of the lids 183a and 183b.

As a result, at least at the open positions of the lids 183a and 183b, the swaying and loosening of the cable 180 can be suppressed. Therefore, it is possible to prevent the lids 183a and 183b from opening at an unintended position or timing and dropping seedlings.
The guide member 173 may guide the cord 180 at least when the cord 180 passes through the open positions D1 and D2, but may guide the cord 180 before and after passing through the open positions D1 and D2. preferable.

As shown in FIGS. 2 and 3, the working machine 1 has a plurality of chairs on which workers who work with the second ground working machine (transplanter 3) of the ground working device 1B sit. The plurality of chairs are a plurality of front chairs (first front chair 187A, second front chair 187B) and a plurality of rear chairs (first rear chair 187C, second rear chair 187D). A first front chair 187A is provided in front of the first implanted unit 36A and a second front chair 187B is provided in front of the second implanted unit 36B. Also, the first rear chair 187C is provided behind the first implantation unit 36A, and the second rear chair 187D is provided behind the second implantation unit 36B.

In other words, in the transplanter 3 having the first seedling supply device 38A and the second seedling supply device 38B arranged side by side in the machine width direction K2, the first front chair 187A is provided in front of the first seedling supply device 38A. , the second front chair 187B is provided in front of the second seedling feeder 38B. Also, the first rear chair 187C is provided behind the first seedling supply device 38A, and the second rear chair 187D is provided behind the second seedling supply device 38B.

The first front chair 187A and the second front chair 187B are chairs on which the worker sits facing the rear (the seedling supply device 38 side). The first rear chair 187C and the second rear chair 187D are chairs on which the worker sits facing forward (toward the seedling supply device 38 side).
By providing chairs for workers to sit on before and after the seedling supply device 38, it is possible to reduce (narrow) the width of the work machine 1 (the ground work device 1B) in the machine width direction K2, making it easy to move between fields. It becomes easier (advantageous) to transport by truck. In addition, since the first open position D1 (seedling dropping position) and the second open position D2 (seedling dropping position) are located in the front-rear direction midway of the transfer route R1 of the supply cups 171 and 172, they are the seedling dropping positions. is not in front of you, the work of supplying seedlings to the supply cups 171 and 172 is facilitated. In addition, since the work of the front worker and the rear worker is unified, the change of workers is facilitated.

As shown in FIGS. 43-45, the first front chair 187A and the second front chair 187B are supported by a chair support 150 via a position adjustment mechanism 230. As shown in FIGS.
The position adjustment mechanism 230 is a mechanism that enables adjustment of the positions of the chairs (first front chair 187A and second front chair 187B) with respect to the transplanter (second ground working machine) 3 . The position adjustment mechanism 230 includes a first position adjustment mechanism 231 , a second position adjustment mechanism 232 and a third position adjustment mechanism 233 . The first position adjusting mechanism 231 is a mechanism that allows the positions of the chairs (the first front chair 187A and the second front chair 187B) to be adjusted in the machine width direction K2. The second position adjustment mechanism 232 is a mechanism that allows the positions of the chairs (the first front chair 187A and the second front chair 187B) to be adjusted in the front-rear direction. The third position adjustment mechanism 233 is a mechanism that allows the positions of the chairs (the first front chair 187A and the second front chair 187B) to be adjusted in the vertical direction.

The position adjustment mechanism 230 includes a position adjustment mechanism 230A for adjusting the position of the first front chair 187A and a position adjustment mechanism 230B for adjusting the position of the second front chair 187B. Since the configuration of the position adjustment mechanism 230A and the configuration of the position adjustment mechanism 230B are the same, the configuration of the position adjustment mechanism 230A will be described, and the description of the configuration of the position adjustment mechanism 230B will be omitted.

As shown in FIGS. 43 and 46, the first position adjustment mechanism 231 of the position adjustment mechanism 230A includes a fixed plate 231a fixed to the second support 152 of the chair support 150 and a fixture attached to the fixed plate 231a. and a movable plate 231b attached by (a bolt 231c and a nut 231d). As shown in FIG. 12, the fixed plate 231a is fixed to the left portion of the lateral support member 158 of the second support 152. As shown in FIG. As shown in FIGS. 46 and 52, the fixing plate 231a is formed with a plurality of through holes 231e arranged in the machine width direction K2. The movable plate 231b is also formed with a plurality of through holes 231f arranged in the machine width direction.

The plurality of through holes 231e formed in the fixed plate 231a and the plurality of through holes 231f formed in the movable plate 231b are arranged side by side at the same interval (pitch). The through hole 231e formed in the fixed plate 231a and the through hole 231f formed in the movable plate 231b are overlapped, the bolt 231c is inserted, and the nut 231d is screwed, whereby the movable plate 231b is attached to the fixed plate 231a. Positioned and attached. 43, the position of the movable plate 231b with respect to the fixed plate 231a can be changed by shifting the movable plate 231b in the machine width direction K2 with respect to the fixed plate 231a and changing the overlapping through-holes. can be adjusted in the machine width direction K2.

As shown in FIGS. 45 and 46, the third position adjusting mechanism 233 of the position adjusting mechanism 230A includes a cylindrical body 233a fixed to the movable plate 231b and a fixture (pin) 233c attached to the cylindrical body 233a. and a column 233b. The tubular body 233a has a rectangular tubular shape and extends in the vertical direction. 233 d of through-holes are formed in the cylinder 233a. The columnar body 233b has a square tubular shape that is thinner than the tubular body 233a, is inserted into the tubular body 233a, and extends in the vertical direction. A plurality of through holes 233e arranged in the vertical direction are formed in the column 233b. By overlapping the through hole 233d formed in the cylindrical body 233a and the through hole 233e formed in the cylindrical body 233b and inserting the pin 233c, the cylindrical body 233b is positioned and attached to the cylindrical body 233a. Further, as shown by the phantom lines in FIG. 45, by vertically shifting the pillar 233b with respect to the cylinder 233a and changing the through-holes to be overlapped, the pillar 233b can be vertically moved with respect to the cylinder 233a. direction can be adjusted.

As shown in FIGS. 44 and 46, the second position adjusting mechanism 232 of the position adjusting mechanism 230A includes a support base 232a fixed to the upper end of a column 233b and a mounting fixture (bolt) 232c attached to the support base 232a. and a bottom receiving member 232b which is attached by and receives the bottom of chair 187A. The support base 232a has a front portion 232d, an intermediate portion 232e, and a rear portion 232f. The intermediate portion 232e extends in the front-rear direction, and the front portion thereof is fixed to the upper end portion of the column 233b. The front portion 232d is fixed to the front end of the intermediate portion 232e. A spring 234 is attached to the front portion 232d to support the bottom rear portion of the chair 187A. The rear portion 232f is fixed to the rear end of the intermediate portion 232e. As shown in FIG. 54, the rear portion 232f has a through hole 232i through which a shaft 232h extending in the machine width direction K2 is inserted.

As shown in FIGS. 46 and 54, the bottom receiving member 232b is attached to the top of the rear portion 232f of the support base 232a. The bottom receiving member 232b has an upper portion 232b1 and side portions 232b2. The upper portion 232b1 is a horizontally arranged plate-like portion, and the bottom front portion of the first front chair 187A is attached to the upper surface thereof. The side portions 232b2 extend downward from one end side and the other end side of the upper portion 232b1 in the machine width direction. A plurality of through holes 232g are formed in the side portion 232b2 at intervals in the front-rear direction. When the bottom receiving member 232b is placed on the upper part of the support base 232a, one of the plurality of through holes 232g of the side part 232b2 overlaps with the through hole formed in the rear part 232f of the support base 232a. The bottom receiving member 232b is positioned with respect to the support base 232a by inserting the shaft 232h through the through hole 232g of the overlapping side portion 232b2 and through the through hole of the rear portion 232f, and preventing it from slipping off with a stopper such as a β pin. installed. Further, as shown by the phantom lines in FIG. 44, by shifting the bottom receiving member 232b in the front-rear direction with respect to the support base 232a and changing the through-holes to be overlapped, the position of the bottom receiving member 232b with respect to the support base 232a can be changed. can be adjusted forwards and backwards.

By adjusting the position of the bottom receiving member 232b in the front-rear direction by the second position adjusting mechanism 232, the position of the first front chair 187A attached to the bottom receiving member 232b can be adjusted in the front-rear direction. Further, the position of the first front chair 187A can be adjusted vertically by adjusting the position of the column 233b relative to the cylinder 233a by the third position adjusting mechanism 233 in the vertical direction. Further, by adjusting the position of the movable plate 231b relative to the fixed plate 231a in the machine width direction by the first position adjustment mechanism 231, the position of the first front chair 187A can be adjusted in the machine width direction.

Therefore, according to the position adjusting mechanism 230A, the position of the first front chair 187A can be adjusted in the longitudinal direction, the vertical direction, and the machine width direction. Further, according to the position adjusting mechanism 230B, the position of the second front chair 187B can be adjusted in the longitudinal direction, the vertical direction, and the machine width direction by the same action as the position adjusting mechanism 230A.
The configurations of the first position adjustment mechanism 231, the second position adjustment mechanism 232, and the third position adjustment mechanism 233 are not limited to the configurations described above. For example, regarding the first position adjustment mechanism 231, the horizontal support member 158 of the second support 152 is a square pipe, and instead of the fixing plate 231a, a fixture having a U-bolt is fixed to the horizontal support member 158, and the fixture is fixed to the horizontal support member 158. A configuration in which the movable plate 231b is attached can be employed. According to this configuration, by loosening the fixture, the movable plate 231b can be moved in the machine width direction along the lateral support member 158 together with the fixture. Therefore, the position of the movable plate 231b with respect to the fixed plate 231a can be adjusted in the machine width direction.

As shown in FIG. 2, a footrest plate 235A is provided between the first front chair 187A and the transplanter 3 for placing the feet of the worker sitting on the first front chair 187A. A footrest plate 235B is provided between the second front chair 187B and the transplanter 3 for placing the feet of the worker sitting on the second front chair 187B. The footrest plates 235A and 235B are rectangular plates in plan view.
The footrest plate 235A is arranged behind and below the first front chair 187A. The footrest plate 235B is arranged behind and below the second front chair 187B. The footrest plates 235A and 235B are arranged behind and above the pressing device 20 of the rotary tiller 2 . Also, the footrest plate 235A is arranged in front and above the connection bracket 61 (first fixture 61A) of the first machine frame 37A. The footrest plate 235B is arranged on the upper front side of the connection bracket 61 (the second fixture 61B) of the second machine frame 37B.

As shown in FIGS. 47 and 48, the footrest plate 235A is formed with a large number of ribbed holes 236 and a plurality (four) of through holes 237 through which bolts (wing bolts) B6 are inserted. The same applies to the footrest plate 235B.
The footrest plates 235A and 235B are detachably attached to the chair support 150. As shown in FIG. Specifically, the footrest plates 235A and 235B are detachably attached to attachment portions 260A and 260B (see FIG. 12) provided on the chair support 150. As shown in FIG. The mounting portion 260A is a portion for mounting the footrest plate 235A. The mounting portion 260B is a portion for mounting the footrest plate 235B. Mounting portions 260 A and 260 B are provided on first support 151 of chair support 150 .

As shown in FIGS. 12 and 48, the mounting portion 260A is composed of a front support member 151a and a rear support member 151b of the first support member 151, and a connecting support member 151c arranged on the left side of the first support member 151. It is A plurality (four) of first stays 261 are attached to the front support member 151a and the rear support member 151b, with nuts fixed between the connection support members 151c adjacent to each other in the machine width direction K2. The footrest plate 235A is placed on the front support member 151, the rear support member 151b, and the connecting support member 151c arranged on the left side of the first support member 151 behind and below the first front chair 187A. , and bolts (wing bolts) B6.

As shown in FIG. 12, the mounting portion 260B is composed of a front support member 151a and a rear support member 151b of the first support member 151, and a connecting support member 151c arranged on the right side of the first support member 151. . A second stay 262 is attached to the front support member 151a and the rear support member 151b, with a nut fixed between the connection support members 151c adjacent to each other in the machine width direction K2. A plurality of (four) second stays 262 are provided in the same manner as the first stay 261 . The footrest plate 235B is mounted on the front support member 151a, the rear support member 151b, and the connecting support member 151c arranged on the right side of the first support member 151, and is attached to the second stay 262 by bolts (wing bolts). fixed to

The footrest plate 235A can be removed from the attachment portion 260A provided on the chair support 150 by removing the bolt (wing bolt) B6 from the first stay 261. As shown in FIG. Similarly, the footrest plate 235B can be removed from the mounting portion 260B provided on the chair support 150 by removing the bolt (wing bolt) from the second stay 262. As shown in FIG. This makes it possible to easily adjust the spring of the pressure device 20 of the rotary tiller 2 . Also, the distance between the first transplant unit 36A and the second transplant unit 36B is adjusted by moving the connection bracket 61 of the first machine frame 37A and the connection bracket 61 of the second machine frame 37B along the toolbar 43. (row spacing adjustment) can be easily performed. In addition, it is possible to easily adjust the position of an irrigation tube, which will be described later.

Note that the footrest plates 235A and 235B may be attached to the chair support 150 so as to be openable and closable. For example, the front portions of the footrest plates 235A and 235B are attached to the front support member 151a of the first support 151 via hinges, or the rear portions of the footrest plates 235A and 235B are attached via hinges. It can be attached to the rear support 151 b of the first support 151 . With this configuration, the footrest plates 235A, 235B are opened relative to the chair support 150 to adjust the springs of the compression device 20 and the distance between the first and second implantable units 36A, 36B. It is possible to easily perform (row spacing adjustment), position adjustment of the irrigation tube, and the like.

As shown in FIG. 20 and the like, the first rear chair 187C and the second rear chair 187D are attached to the seat frame 197. As shown in FIG. Seat frame 197 is the frame to which the chair is attached. Specifically, the seat frame 197 is attached with a first rear chair 187C and a second rear chair 187D. The seat frame 197 is connected to a mounting body 196 attached to the rotary cultivator 2 so as to be vertically movable.

The seat frame 197 has a frame body 199, a frame coupling mechanism 200, and a plurality of wheels (first wheel 206A to third wheel 206C).
A first rear chair 187C and a second rear chair 187D are attached to the frame body 199 . The frame main body 199 includes a first frame portion 201 arranged on the left side (one side) of the transplanter 3, a second frame portion 202 arranged on the right side (the other side) of the transplanter 3, and a second frame portion 202 arranged on the right side (the other side) of the transplanter 3. It has a third frame portion 203 connecting rear portions of the first frame portion 201 and the second frame portion 202 . The first frame portion 201 and the second frame portion 202 are made of square pipe material. The first frame portion 201 is arranged behind the first side member 196A so as to extend in the front-rear direction K1. The second frame portion 202 is arranged behind the second side member 196B so as to extend in the front-rear direction K1.

The third frame portion 203 is arranged behind the transplanter 3 so as to extend in the machine width direction K2. The third frame portion 203 is composed of a plurality of square pipe materials (first member 203A, second member 203B, third member 203C). The left end of the first member 203A is connected to the rear portion of the first frame portion 201 . The right end of the second member 203B is connected to the rear portion of the second frame portion 202 . The third member 203C connects the first member 203A and the second member 203B. The first member 203A and the second member 203B are positionally adjustable in the machine width direction K2 along the third member 203C.

As shown in FIGS. 20 and 49, a first rear chair 187C is attached to the left portion of the third member 203C of the third frame portion 203 via a seat support member 227A. The first rear chair 187C is attached to the seat support member 227A so that its position can be adjusted in the front-back direction and the up-down direction. As shown in FIG. 20, a second rear chair 187D is attached to the right portion of the third member 203C via a seat support member 227B. The configuration of the seat support member 227B is the same as the configuration of the seat support member 227A. The second rear chair 187D is attached to the seat support member 227B so that its position can be adjusted in the front-back direction and the up-down direction. Also, the sheet support members 227A and 227B are attached to the third member 203C so as to be positionally adjustable in the machine width direction K2. In other words, the seat support members 227A and 227B have position adjustment mechanisms that can adjust the positions of the first rear chair 187C and the second rear chair 187D in the longitudinal direction, machine width direction, and vertical direction. The configuration of this position adjustment mechanism is a position adjustment mechanism 230 (first position adjustment mechanism 231, second position adjustment mechanism 232, third position adjustment mechanism 233) that adjusts the positions of the first front chair 187A and the second front chair 187B. is similar to

As shown in FIGS. 20 and 49, a footrest plate 235C is arranged on the front and lower side of the first rear chair 187C for the worker sitting on the first rear chair 187C to put his/her feet on. A footrest plate 235D for placing the feet of an operator seated on the second rear chair 187D is arranged in front and below the second rear chair 187D. The footrest plates 235C and 235D are supported on the frame body 199 of the seat frame 197. As shown in FIG. Specifically, the footrest plates 235C and 235D are supported on the third member 203C of the third frame portion 203. As shown in FIG.

The frame connecting mechanism 200 is a mechanism that connects the frame main body 199 to the mounting body 196 so as to be vertically movable. The frame connecting mechanism 200 has a first mechanism 200A and a second mechanism 200B. The first mechanism 200A connects the first frame portion 201 to the first side member 196A. The second mechanism 200B connects the second frame portion 202 to the second side member 196B. 200 A of 1st mechanisms and the 2nd mechanism 200B are comprised by the parallel link mechanism.

A plurality of wheels (first wheel 206A to third wheel 206C) are composed of tires, for example, and support the frame body 199 by contacting the ground. Therefore, the seat frame 197 moves up and down with respect to the rotary cultivator 2 and the transplanter 3 following irregularities in the field.
A first wheel 206A is provided on one side (left side) of the frame body 199 in the machine width direction K2, and a second wheel 206B is provided on the other side (right side) of the frame body 199 in the machine width direction K2. there is The third wheel 206C is provided in the middle portion (central portion) of the frame main body 199 in the machine width direction K2. In other words, the third wheel 206C is positioned between the first rear chair 187C and the second rear chair 187D.

As shown in FIGS. 20 and 49 , a link member 215 is provided across the working machine coupling mechanism 41 and the seat frame 197 . Link member 215 includes a first link member 215A and a second link member 215B. The link member 215 is provided across the toolbar 43 and the upper link 209A of the frame coupling mechanism 200. As shown in FIG.
Note that the number of link members 215 may be one. In other words, it is sufficient to have at least one link member 215 . Also, the link member 215 may be provided across the seat frame 197 and the member that moves up and down together with the transplanter 3 or the transplanter 3 .

As shown in FIG. 20, the first link member 215A is arranged inward of the machine width of the first side member 196A and the first mechanism 200A. The second link member 215B is arranged inwardly of the second side member 196B and the second mechanism 200B.
As shown in FIGS. 20 and 49, the front end (upper end) of the first link member 215A is attached to a bracket member 228A fixed to the rear surface of the tool bar 43 via a pivot 229A around the axis in the machine width direction K2. It is rotatably pivoted. An upper portion (front portion) of the second link member 215B is rotatably supported by a bracket member 228B fixed to the rear surface of the tool bar 43 via a pivot 229B about an axis in the machine width direction K2.

The engagement pin 221 is provided on the link 209A of the first mechanism 200A and the link 209B of the second mechanism 200B so as to protrude inward in the machine width. The left engaging pin 221 is inserted through the elongated hole 220 of the first link member 215A, and the right engaging pin 221 is inserted through the elongated hole 220 of the second link member 215B. Note that the engagement pin 221 may be provided on the frame main body 199 . Also, the front end portion of the link member 215 may be pivotally supported on the machine frame 37 .

When the seat frame 197 moves up and down during work, the engaging pin 221 moves inside the elongated hole 220 to allow the up and down movement of the seat frame 197 . When the tool bar 43 is lifted to lift the transplanter 3 when the working machine 1 is loaded onto or unloaded from a truck or the like, the link member 215 moves upward and the engaging pin 221 is pulled into the elongated hole 220 . The seat frame 197 can be lifted (pulled up) by moving the link member 215 upward while the engaging pin 221 is in contact with the lower end of the elongated hole 220 .

As described above, the link member 215 allows the seat frame 197 to move up and down during work, and when the transplanter 3 is lifted by the lift drive device 42, the link member 215 moves upward as the second ground working machine rises. , the seat frame 197 can be lifted.
As shown in FIG. 2 and the like, a seedling supply table 188A is provided behind the first front chair 187A. A seedling supply table 188B is provided behind the second front chair 187B. A seedling supply table 188C is provided in front of the first rear chair 187C. A seedling supply table 188D is provided in front of the second rear chair 187D. 188 A of seedling supply stands are located in the front side of the operator seated on 187 A of 1st front chairs. The seedling supply table 188B is positioned in front of the worker seated on the second front chair 187B. 188 C of seedling supply stands are located in the front side of the operator who sat down on the 1st back chair 187C. The seedling supply table 188D is positioned in front of the operator seated on the second rear chair 187D.

Seedling trays having a large number of seedlings can be placed on the seedling feeders 188A-188D. An operator can supply seedlings to the supply cups 171 and 172 of the seedling supply device 38 from seedling trays placed on the seedling supply bases 188A to 188D.
First, the configuration of the seedling supply bases 188A and 188B will be described.
As shown in FIG. 12, the seedling supply bases 188A and 188B are attached to a position adjustment mechanism 230 that supports the front chairs in a position-adjustable manner. Specifically, the seedling supply base 188A is attached to a position adjustment mechanism 230 that supports the first front chair 187A. The seedling feeder 188B is attached to a position adjustment mechanism 230 that supports the second front chair 187B. The seedling supply base 188A and the seedling supply base 188B are configured symmetrically across the center line of the working machine 1 in the machine width direction K2. Except for this configuration (symmetrical configuration), the configuration of the seedling supply base 188A and the configuration of the seedling supply base 188B are the same, so the configuration of the seedling supply base 188A will be explained, and the explanation of the configuration of the seedling supply base 188B will be omitted. do.

As shown in FIGS. 12 and 43 to 48, the seedling supply base 188A is attached to the support base 232a of the second position adjustment mechanism 232 via a support mechanism 270. As shown in FIG. The support mechanism 270 has a receiving tube 271 , a support arm 272 and a rotation support mechanism 273 . The receiving tube 271 is cylindrical, extends in the machine width direction, and is fixed to the intermediate portion 232e of the support base 232a. The support arm 272 is formed by bending a cylindrical pipe at two points. As shown in FIG. 47 and the like, the support arm 272 has an arm proximal end portion 272a, an arm intermediate portion 272b, and an arm distal end portion 272c. As shown in FIGS. 43 and 46, the arm base end portion 272a extends in the machine width direction K2, and one end side is inserted into the receiving tube 271 from the machine width inside (right side). As shown in FIGS. 45 to 47, the arm intermediate portion 272b extends rearward by bending from the other end side of the arm base end portion 272a, and shifts upward as it extends rearward. The arm intermediate portion 272b is located on the machine width inner side of the first front chair 187A. As shown in FIGS. 45 and 47, the arm tip portion 272c is bent and extends upward from the rear end of the arm intermediate portion 272b.

As shown in FIG. 50 , the rotation support mechanism 273 has a base 274 and a support shaft 275 . The base 274 has an outer cylindrical body 274a, a substrate 274b, and a regulation plate 274c. The outer cylindrical body 274a is fitted onto the upper portion of the arm tip portion 272c. The substrate 274b is fixed to the top of the outer cylindrical body 274a. The substrate 274b has two standing portions 274d standing respectively from the front portion and the rear portion, and a first locking portion 274e to which one end of the spring 276 is locked. The regulation plate 274c is fixed to the substrate 274b. The restricting plate 274c has an outward projecting portion 274c1 projecting upward on the machine width outside side (left side) and an inward projecting portion 274c2 projecting upward on the machine width inside side (right side). . The outward projecting portion 274c1 projects upward from the substrate 274b on the left side of the substrate 274b. The inward protruding portion 274c2 protrudes upward from the substrate 274b on the right side of the substrate 274b. As shown in FIG. 51, the height of the outwardly protruding portion 274c1 is higher than the height of the inwardly protruding portion 274c2. The support shaft 275 extends across the two standing portions 274d of the substrate 274b. The support shaft 275 extends in the front-rear direction between the inward protruding portion 274c2 and the outward protruding portion 274c1.

As shown in FIGS. 50 to 53, the seedling supply base 188A is rotatably supported by a rotation support mechanism 273. As shown in FIGS. 188 A of seedling supply bases have the mounting part 191 which can place a seedling tray, and the support structure 192 which supports this mounting part 191. As shown in FIG. The support structure 192 has flexures 193F and 193B and a bar 194 . The bending members 193F and 193B are bent in an obtuse V shape in the middle between one end and the other end. Hereinafter, a portion between one end of the bending members 193F and 193B and a middle portion (bending portion) is referred to as a “one end side portion”, and a portion between the other end of the bending members 193F and 193B and a middle portion (bending portion) is referred to as the "other end side portion".

One end of the bending member 193F is attached to the front portion of the support shaft 275 . One end of the bending member 193B is attached to the front portion of the support shaft 275 . The bar 194 is provided at one end side portion of the bending members 193F and 193B. The bar 194 extends in the front-rear direction across the bending member 193F and the bending member 193B. One end of the bar 194 is provided with a second locking portion 194a to which the other end of the spring 276 is locked.

The mounting portion 191 is provided at the other end side portions of the bending members 193F and 193B. The mounting portion 191 has a plurality (two) of receiving members 191a extending in the front-rear direction over the bending members 193F and 193B, and a rectangular annular receiving frame 191b attached to the receiving members 191a. there is The receiving member 191a and the receiving frame 191b constitute a substantially rectangular seedling placement surface that supports the bottom surface of the seedling tray.

As shown in FIGS. 50 to 52, the bending members 193F and 193B can rotate around the shaft 275. As shown in FIGS. A rotation range of the bending members 193F and 193B is restricted by a restriction plate 274c.
When the bending members 193F and 193B are rotated outward in the width direction of the machine, the bar member 194 comes into contact with the outward projecting portion 274c1 of the restricting plate 274c, and further rotation is disabled. In this state, the seedling supply base 188A assumes the first posture in which the seedling placement surface faces the horizontal direction. When the bending members 193F and 193B are rotated inward in the width direction of the machine, the bar member 194 comes into contact with the inward projecting portion 274c2 of the restricting plate 274c, and further rotation is disabled. In this state, the seedling supply base 188A assumes the second posture in which the seedling placement surface faces the vertical direction. The second posture includes the case where the seedling placement surface faces the vertical direction (the vertical direction) and the case where the seedling placement surface faces the direction slightly inclined with respect to the vertical direction.

The spring 276 pulls the bar 194 toward the inward projecting portion 274c2 when the seedling supply base 188A assumes the first posture. As a result, unless the operator applies a particular force, the bar 194 is maintained in contact with the inwardly protruding portion 274c2, thereby maintaining the first posture. The spring 276 pulls the bar 194 toward the outward projecting portion 274c1 when the seedling supply base 188A assumes the second posture. As a result, unless the operator applies a particular force, the bar 194 is maintained in contact with the outward protrusion 274c1, so that the second posture is maintained.

A seedling tray is placed on the seedling placement surface when the seedling supply base 188A is in the first posture. The mounting portion 191 is located behind the first front chair 187A and in front of the first seedling supply device 38A when the seedling supply base 188A is in the first posture. Therefore, the worker sitting on the first front chair 187A and facing the first seedling supply device 38A picks up the seedlings on the seedling tray placed on the seedling placement surface of the placing section 191 in front of her. Then, the seedling can be supplied to the supply cups 171, 172 of the first seedling supply device 38A.

When the seedling tray is not placed on the seedling placement surface of the placing portion 191 (before or after the seedling supply work is started or completed), the seedling supply table 188A is set to the second posture in which the seedling placement surface faces up and down. When the seedling supply base 188A is in the second posture, the placing portion 191 is positioned on the machine width inner side of the first front chair 187A. Further, when the seedling supply base 188A assumes the second posture, the placing portion 191 is positioned on the machine width inner side of the second front chair 187B. Thereby, the operator can get on and off the first front chair 187A and the second front chair 187B without being disturbed by the seedling supply stands 188A and 188B.

46, the arm proximal end portion 272a of the support arm 272 is rotatable around the axis of the receiving tube 271 (around the axis in the machine width direction). As shown in FIG. 53, by rotating the arm base end portion 272a around the axis of the receiving tube 271, the placement portion 191 can be moved laterally from the front side of the first front chair 187A.
In addition, as described above, the seedling supply base 188A and the seedling supply base 188B are configured symmetrically with respect to the center line in the machine width direction of the work machine 1. Therefore, the seedling supply base 188A and the seedling supply base 188B can be used interchangeably. Specifically, as shown in FIG. 54, the seedling supply base 188A is removed, and one end of the arm base end portion 272a of the seedling supply base 188B is attached to the receiving cylinder 271 of the support mechanism 270 that supports the seedling supply base 188A. It can also be attached to the support base 232a by inserting it from the width outside (left side).

Similarly, the seedling supply base 188B is removed, and one end side of the arm base end portion 272a of the seedling supply base 188A is inserted into the receiving tube 271 of the support mechanism 270 that supports the seedling supply base 188B from the machine width outside (right side). and can be attached to the support base 232a.
When the seedling supply base 188A and the seedling supply base 188B are exchanged, the placement section 191 is arranged to move the first front chair 187A and the second front chair 187B to the second position when the seedling supply base 188A and 188B are in the second posture. Located on the width outer side.

Next, the configuration of the seedling supply bases 188C and 188D will be described.
The seedling feeder 188C is attached to the seat support member 227A that supports the first rear chair 187C. The seedling feeder 188D is attached to the seat support member 227B that supports the second rear chair 187D. The seedling supply base 188C and the seedling supply base 188D are configured symmetrically across the center line of the working machine 1 in the machine width direction. Except for this configuration (symmetric configuration), the configuration of the seedling supply base 188C and the configuration of the seedling supply base 188C are the same.

In addition, the seedling supply base 188C and the seedling supply base 188A are positioned at the center of the first seedling supply device 38A in the front-rear direction when the first rear chair 187C and the first front chair 187A are arranged at the same position in the machine width direction. It is symmetrical across the line. Except for this configuration (the symmetrical configuration) and the mounting position (attached to the seat support member 227A instead of the chair support 150), the configuration of the seedling feeder 188A is the same as that of the seedling feeder 188C.

In addition, when the second rear chair 187D and the second front chair 187B are arranged at the same position in the width direction of the machine, the seedling supply base 188D and the seedling supply base 188B are positioned at the center of the second seedling supply device 38B in the longitudinal direction. It is symmetrical across the line. Except for this configuration (a symmetrical configuration) and the mounting position (attached to seat support member 227B instead of chair support 150), the configuration of seedling feeder 188B is the same as that of seedling feeder 188D.

Since the seedling supply base 188C and the seedling supply base 188D are configured symmetrically across the center line in the machine width direction of the working machine 1, the seedling supply base 188C and the seedling supply base 188D can be used interchangeably. can.
As shown in FIGS. 2 and 20, a seedling tray 190 is provided above the first seedling supply device 38A and the second seedling supply device 38B. A plurality of seedling trays can be placed on the seedling placement table 190 .

As shown in FIG. 21, the seedling platform 190 has a rectangular frame 190a and a bottom plate 190b provided below the frame 190a. The bottom plate 190b may be composed of a flat plate, or may be composed of a mesh or punching metal. Multiple seedling trays can be placed on the bottom plate 190b.
The seedling mounting table 190 is formed longer in the machine width direction K2 than in the front-rear direction K1, and is arranged so as to straddle above the first seedling supply device 38A and above the second seedling supply device 38B. However, the seedling placement table 190 does not cover the supply cups 171 and 172 located in front of the workers seated on the respective chairs.

As shown in FIG. 21, the seedling mounting base 190 is mounted on a base holder 189 provided on the connecting frame 130 connecting the first transplanting unit 36A and the second transplanting unit 36B. The stand support 189 is provided on the fifth connecting frame member 135 . The stand receiver 189 is arranged above the first seedling supply device 38A and the second seedling supply device 38B.
An operator can supply seedlings from a seedling tray on the seedling placement table 190 to the seedling supply cups 171 and 172 . Since the seedling mounting table 190 is arranged to straddle the top of the first seedling supply device 38A and the top of the second seedling supply device 38B, the first front chair 187A, the second front chair 187B, and the first rear chair. Workers seated on the chairs 187C and 187D can pick up the seedlings from the seedling tray on the seedling placing table 190 . That is, the seedling platform 190 is arranged at a position where a worker sitting on each chair can pick up seedlings from the seedling tray on the seedling platform 190 .

When the seedling tray on the seedling supply table 188 runs out of seedlings, the operator can supply the seedlings in the seedling tray on the seedling mounting table 190 to the supply cups 171 and 172 . That is, the seedling placement table 190 is a table on which a spare seedling tray is placed. Also, when the seedling tray on the seedling supply table 188 runs out of seedlings, the empty seedling tray may be replaced with the seedling tray on the seedling placing table 190 . Further, the seedling placement table 190 may be used as a common seedling supply table for each worker without providing the seedling supply table 188 located in front of each worker.

As shown in FIGS. 2, 13, and 55, the work machine 1 includes spare seedling stands 280L and 280R for placing containers CN containing seedling trays. The spare seedling stands 280L and 280R are arranged above the rotary tiller 2. As shown in FIG. The spare seedling stand 280L is arranged above the left portion of the rotary tiller 2 and in front of the first front chair 187A. The spare seedling stand 280R is arranged above the right portion of the rotary tiller 2 and in front of the second front chair 187B.

The spare seedling stand 280L and the spare seedling stand 280R differ only in arrangement and have the same configuration. Therefore, the configuration of the spare seedling stand 280L will be described below, and the explanation of the configuration of the spare seedling stand 280R will be omitted.
As shown in FIG. 55, the preliminary seedling stand 280L includes a first support 281, a second support 282, a third support 283, a fourth support 284, a first bracket 285, a second bracket 286, a mounting frame 287, and a mounting plate. 288. The first support 281, the second support 282, the third support 283, and the fourth support 284 extend vertically. As shown in FIG. 13, the first support 281 and the second support 282 are fixed to the lower plate 19Cd of the support cover 19C4. As shown in FIG. 55, the third strut 283 and the fourth strut 284 are fixed to an extension member 289 attached to the front extension portion 34L of the mounting frame 14. As shown in FIG. The first strut 281 is arranged in front of the second strut 282 . The third strut 283 is arranged in front of the fourth strut 284 . The first support 281 is arranged to the left of the third support 283 . The second strut 282 is arranged to the left of the fourth strut 284 .

The first bracket 285 connects the upper part of the first support 281 and the upper part of the second support 282 . The second bracket 286 connects the upper part of the third support 283 and the upper part of the fourth support 284 . The mounting frame 287 is a frame having a rectangular outer shape in a plan view. The mounting frame 287 is constructed by combining angle members having an L-shaped cross section. A lower portion of the mounting frame 287 is supported by a first bracket 285 and a second bracket 286 . As shown in FIGS. 13 and 55 , the mounting plate 288 is placed on the mounting frame 287 . Note that the mounting plate 288 is omitted in FIG.

The mounting plate 288 is a rectangular plate whose length in the machine width direction is longer than its length in the front-rear direction. A space SPA is formed between the mounting plate 288 and the rotary tiller 2 (between the upper cover 19A). In other words, the mounting plate 288 is arranged to float above the rotary tiller 2 .
As shown in FIGS. 1 and 3, a container CN for accommodating a seedling tray is placed on the mounting plate 288 of the preliminary seedling stands 280L and 280R. The container CN is a rectangular parallelepiped box whose length in the vertical direction is longer than the length in the front-rear direction and the length in the machine width direction. A plurality of seedling trays can be arranged in the vertical direction and accommodated in the container CN. The front of the container CN is open, and the worker can take out the seedling tray accommodated in the container CN from the front. Also, an empty seedling tray on the seedling supply table 188 or the seedling placing table 190 can be replaced with the seedling tray in the container CN. This exchange of seedling trays is performed by workers seated on the first front chair 187A and the second front chair 187B.

As shown in FIGS. 2 and 3, the working machine 1 includes a tube roll 290 around which an irrigation tube is wound. Irrigation tubes are tubes that supply water to planted seedlings. The tube roll 290 is arranged between the traveling body 1A and the rotary tiller 2. As shown in FIG. That is, the tube roll 290 is arranged behind the traveling body 1A and in front of the rotary tiller 2. As shown in FIG. Also, the tube roll 290 is arranged in front of the irrigation pump 50 . Further, the tube roll 290 is arranged between the transmission case 12 and the left side frame 15L in the machine width direction. Moreover, although not shown, the tube roll 290 can also be arranged between the transmission case 12 and the right side frame 15R in the machine width direction.

The tube roll 290 is supported by a roll support 291 so as to be rotatable around the machine width direction axis. As shown in FIG. 55, the roll support 291 has a shaft 292, bearings 293L and 293R, and support rods 294L and 294R. As shown in FIG. 2, the shaft 292 is arranged in front of the rotary tiller 2 and extends in the machine width direction K2. As shown in FIG. 55, the shaft 292 is arranged at a position lower than the mounting plate 288 of the preliminary seedling bed 280L of the rotary tiller 2. As shown in FIG.

The bearing 293L rotatably supports one end of the shaft 292 . The bearing 293R rotatably supports the other end of the shaft 292. As shown in FIG. The support rod 294L extends in the front-rear direction and is connected to the first support 281 and the second support 282 . The support rod 294R extends in the front-rear direction and is connected to the third support 283 and the fourth support 284 . A bearing 293L is supported at the rear portion of the support rod 294L. A bearing 293R is supported at the rear portion of the support rod 294R.

Tube roll 290 is mounted on shaft 292 . The tube roll 290 rotates around the machine width direction axis as the shaft body 292 rotates. By rotating the tube roll 290, the irrigation tube can be paid out. The irrigation tube can extend rearward through the space SPA between the mounting plate 288 of the preliminary seedling bed 280L and the rotary tiller 2 . Also, the irrigation tube can be passed under the footrest plates 235A and 235B.

One end of the irrigation tube (the end on the unwinding side) is fixed to the field before the work implement 1 is driven. The working machine 1 is run with this one end fixed to the field. Then, the irrigation tube is pulled, and the tube roll 290 and the shaft 292 rotate integrally. As a result, the irrigation tube is unwound from the tube roll 290 and laid on the ridge formed by the working machine 1 . The seedlings planted in the ridges can be watered from the laid watering tubes.

As shown in FIGS. 1, 56, and 57, the working machine 1 may include a mulching film laying device 300 for laying a mulch film on ridges formed in a field as the ground working device 1B. The mulch film laying device 300 is attached to the rear of the tractor 1A. Specifically, the mulch film laying device 300 is attached to the rotary tiller 2 attached to the rear portion of the tractor 1A. The mulch film laying device 300 is arranged behind the rotary tiller 2 and in front of the transplanter 3 .

The mulch film laying apparatus 300 lays mulch films on two ridges UN1 and UN2 formed side by side in the width direction of the tractor 1A (the same as the machine width direction K2). Hereinafter, for convenience of explanation, of the two ridges UN1 and UN2, the ridge formed on the left side is called "first ridge UN1", and the ridge formed on the right side is called "second ridge UN2".
As shown in FIG. 56, the mulch film laying apparatus 300 has a first roll support shaft 301 and a second roll support shaft 302. As shown in FIG. The first roll support shaft 301 supports the first film roll 303 around which the mulch film laid on the first ridge UN1 is wound. The second roll support shaft 302 supports a second film roll 304 around which the mulch film laid on the second ridges UN2 is wound.

The first roll support shaft 301 and the second roll support shaft 302 extend in the width direction (machine width direction K2) of the tractor 1A. The first roll support shaft 301 and the second roll support shaft 302 overlap in the width direction (machine width direction K2) of the tractor 1A. In other words, the machine width inner side portion 301a of the first roll support shaft 301 overlaps the machine width inner side portion 302a of the second roll support shaft 302 in the machine width direction K2.

The right end of the first roll support shaft 301 (the end on the inner side of the machine width) is positioned to the right of the center of the mulch film laying apparatus 300 in the machine width direction K2. Also, the right end of the first roll support shaft 301 is positioned to the right of the left end of the second roll support shaft 302 and the left end of the second film roll 302 .
The left end of the second roll support shaft 302 (the end on the inner side of the machine width) is positioned leftward of the center of the multi-film laying apparatus 300 in the machine width direction K2. Further, it is positioned to the left of the right end of the first roll support shaft 301 and the right end of the first film roll 301 .

As shown in FIG. 56, the first roll support shaft 301 and the second roll support shaft 302 are staggered in the front-rear direction K1. As a result, as shown in FIGS. 1 and 57, the first film roll 303 and the second film roll 304 are staggered in the front-rear direction K1. In the case of this embodiment, the first roll support shaft 301 is arranged in front of the second roll support shaft 302 . However, the first roll support shaft 301 may be arranged behind the second roll support shaft 302 . Also, although not shown, the first roll support shaft 301 and the second roll support shaft 302 may be arranged to be shifted in the vertical direction.

Both ends of the first roll support shaft 301 are supported by first shaft supports 305L and 305R. The first shaft support 305L supports the left end of the first roll support shaft 301 (the end on the outer side of the machine width). The first shaft support 305R supports the right end (the end on the inner side of the machine width) of the first roll support shaft 301 .
Both ends of the second roll support shaft 302 are supported by second shaft supports 306L and 306R. The second shaft support 306L supports the left end of the second roll support shaft 302 (the end on the inner side of the width of the machine). The second shaft support 306R supports the right end of the second roll support shaft 302 (the end on the outer side of the machine width).

As shown in FIGS. 58 to 60, the first shaft support 305L is attached to the first side member 196A of the attachment 196 and extends in the machine width direction K2. The first shaft support 305L has a first support member 307 to a fifth support member 311. As shown in FIG. The first support member 307 is fixed to the first side member 196A. A second support member 308 is attached to the first support member 307 via a third support member 309 and extends downwardly from the first support member 307 . The fourth support member 310 is attached to the lower portion of the second support member 308 and extends outward (leftward) from the lower portion. One end (front end) of the fifth support member 311 is connected to the outer end of the fourth support member 310 in the machine width direction via a support shaft 312 . The fifth support member 311 can swing upward or downward around the support shaft 312 . The other end (rear end) of the fifth support member 311 is formed with a recessed engaging portion 311a that is notched downward from above. One end (left end) of 301 is locked. A cover plate 313 for preventing detachment of one end of the first roll support shaft 301 locked to the locking portion 311a is fixed by bolts or the like above the locking portion 311a. As a result, one end (left end) of the first roll support shaft 301 is supported by the first shaft support 305L.

As shown in FIG. 60, the first support member 307 has a plurality of mounting holes 307a arranged side by side at intervals in the machine width direction K2. The third support member 309 has mounting holes 309a corresponding to one or more of the mounting holes 309a. The first support member 307 and the third support member 309 are fixed by overlapping the mounting hole 307a and the mounting hole 309a, inserting a bolt, and screwing a nut. By shifting the third support member 309 with respect to the first support member 307 in the machine width direction K2 and changing the mounting hole 309a that overlaps with the mounting hole 307a, the third support member 309 is shifted from the first support member 307. can be shifted in the machine width direction K2 and fixed. Thereby, the first roll support shaft 301 can be moved in the machine width direction K2. Similarly, the second roll support shaft 302 can also be moved in the machine width direction K2. Therefore, the overlapping range (length) of the first roll support shaft 301 and the second roll support shaft 302 can be changed.

As shown in FIGS. 57 and 61, the first shaft support 305R is attached to the intermediate connector 55. As shown in FIGS. As described above, the intermediate connecting member 55 connects the rear mounting portion 51Mb of the intermediate ridged device 51M and the intermediate member 196C of the mounting member 196. As shown in FIG. The first shaft support 305R has a fifth support 313 and a sixth support 314 . The fifth support member 313 is fixed to the intermediate connecting body 55 (upper member 55a) and extends rightward. The sixth support member 314 extends rearward from the right end of the fifth support member 313 . A front portion of the sixth support member 314 is pivotally supported to the fifth support member 313 so as to be able to swing. Thereby, the sixth support member 314 can swing upward or downward with respect to the fifth support member 313 . A mounting piece 315 provided at the other end (right end) of the first roll support shaft 301 is attached to the rear end of the sixth support member 314 . As a result, the other end (right end) of the first roll support shaft 301 is supported by the first shaft support 305R.

As shown in FIG. 56, the second shaft support 306R is attached to the second side member 196B of the mounting body 196. As shown in FIG. The second shaft support 306R is arranged behind the first shaft supports 305L and 305R. The second shaft support 306R is symmetrical with the first shaft support 305L across the center in the machine width direction K2 when aligned with the first shaft support 305L in the longitudinal direction K1. Except for this point, the configuration of the second shaft support 306R is the same as the configuration of the first shaft support 305L, so the description is omitted.

As shown in FIGS. 56 and 61, the second shaft support 306L is attached to the intermediate connector 55. As shown in FIGS. The second shaft support 306L is arranged behind the first shaft supports 305L and 305R. The second shaft support 306L and the second shaft support 306R are arranged at the same position in the front-rear direction K1. The second shaft support 306L is symmetrical with the first shaft support 305R across the center in the machine width direction K2 when aligned with the first shaft support 305R in the longitudinal direction K1. Except for this point, the configuration of the second shaft support 306L is the same as the configuration of the first shaft support 305R, so the description is omitted.

As shown in FIG. 56 , the mulch film laying device 300 has a first soil covering member 321 , a second soil covering member 322 , a third soil covering member 323 and a fourth soil covering member 324 . The first soil-covering member 321, the second soil-covering member 322, the third soil-covering member 323, and the fourth soil-covering member 324 are composed of disc-shaped soil-covering disks.
The first soil-covering member 321 and the third soil-covering member 323 are provided in a slanted shape that shifts toward the first ridge UN1 as it goes rearward. The second soil-covering member 322 and the fourth soil-covering member 324 are provided in a slanted shape that shifts toward the second ridge UN2 as it goes rearward.

The first soil covering member 321 is arranged behind the right portion of the first film roll 303 . The first soil covering member 321 covers one end (right end) on the second ridge UN2 side of the mulch film unwound from the first film roll 303 and laid on the first ridge UN1 with soil. The second soil covering member 322 is arranged behind the left portion of the second film roll 304 . The second soil covering member 322 covers one end (left end) on the first ridge UN1 side of the mulch film unwound from the second film roll 304 and laid on the second ridge UN2 with soil.

The third covering member 323 is arranged behind the left portion of the first film roll 303 . The third soil covering member 323 covers the other end (left end) of the mulch film unwound from the first film roll 303 and laid on the first ridge UN1 with soil. The fourth covering member 324 is arranged behind the right portion of the second film roll 304 . The fourth soil covering member 324 covers the other end (right end) of the mulch film unwound from the second film roll 304 and laid on the second ridge UN2 with soil.

The first soil covering member 321 and the second soil covering member 322 are arranged to be shifted in the front-rear direction K1. In the case of this embodiment, the first soil covering member 321 is arranged in front of the second soil covering member 322 . However, any one of the first soil covering member 321 and the second soil covering member 322 may be arranged behind the other of the soil covering members. Which of the first soil covering member 321 and the second soil covering member 322 is arranged rearward can be determined by the front-rear relationship between the first roll support shaft 301 and the second roll support shaft 302 . Specifically, when the second roll support shaft 302 is arranged behind the first roll support shaft 301 , the second soil covering member 322 is arranged behind the first soil covering member 321 . When the first roll support shaft 301 is arranged behind the second roll support shaft 302 , the first soil covering member 321 is arranged behind the second soil covering member 322 .

In addition, the first soil covering member 321 and the second soil covering member 322 are arranged so as to overlap in the width direction (machine width direction K2) of the tractor 1A. The first soil covering member 321 and the second soil covering member 322 also overlap in the front-rear direction K1.
The third soil covering member 323 is arranged at the same position as the first soil covering member 321 in the front-rear direction K1. The fourth soil covering member 324 is arranged at the same position as the second soil covering member 322 in the front-rear direction K1. In other words, the third soil covering member 323 and the fourth soil covering member 324 are staggered in the front-rear direction K1 in the same manner as the first soil covering member 321 and the second soil covering member 322 are arranged.

It is preferable that the lower end of the soil-covering member (one of the soil-covering members) arranged in the rear is positioned lower than the lower end of the soil-covering member (the other soil-covering member) arranged in front. In this embodiment, it is preferable that the lower end of the second soil covering member 322 is positioned below the lower end of the first soil covering member 321 . According to this configuration, since the second soil covering member 322 can gather soil from a position deeper than the first soil covering member 321, the first soil covering member 321 and the second soil covering member 322 overlap in the machine width direction K2. Even if it is arranged in such a way that the second soil covering member 322 arranged at the rear side does not run short of the soil collected.

As shown in FIGS. 56, 57, and 61, the first soil covering member 321 and the second soil covering member 322 are attached to the intermediate connecting body 55 via the first connection frame 325 and the bracket 326. As shown in FIGS. The first connection frame 325 is connected to a bracket 326 fixed to the intermediate connecting body 55 so as to be able to swing upward or downward.
As shown in FIGS. 56, 58, and 59, the third covering member 323 is attached to the first side member 196A via the second connection frame 327, the bracket 328, and the first supporting member 307. As shown in FIGS. The second connection frame 327 is connected via a support shaft 316 to a bracket 328 fixed to the first support member 307 so as to be able to swing upward or downward.

As shown in FIG. 56, the fourth soil covering member 324 is attached to the second side member 196B via the third connecting frame 329 and the like. Since the mounting structure of the fourth soil covering member 324 to the second side member 196B is the same as the mounting structure of the third soil covering member 323 to the first side member 196A, description thereof will be omitted.
As shown in FIG. 56, the multi-film laying apparatus 300 has a first film presser 331, a second film presser 332, a third film presser 333, and a fourth film presser 334. As shown in FIG. The first film presser 331, the second film presser 332, the third film presser 333, and the fourth film presser 334 are composed of wheels, for example.

The first film presser 331 and the third film presser 333 are provided in a slanted shape that shifts toward the first ridge UN1 as it goes forward. The second film presser 332 and the fourth film presser 334 are provided in a slanted shape that moves toward the second ridge UN2 as it goes forward.
The first film presser 331 is arranged behind the first film roll 303 . The first film presser 331 presses one end (right end) on the second ridge UN2 side (right side) of the mulch film laid on the first ridge UN1. The second film presser 332 is arranged behind the second film roll 304 . The second film presser 332 presses one end (left end) on the first ridge UN1 side (left side) of the mulch film laid on the second ridge UN2. The third film presser 333 is arranged behind the first film roll 303 . The third film presser 333 presses the other end (left end) of the mulch film laid on the first ridge UN1. A fourth film presser 334 is arranged behind the second film roll 304 . The fourth film presser 334 presses the other end (right end) of the mulch film laid on the second ridge UN2.

The first film presser 331 and the second film presser 332 are staggered in the front-rear direction K1. In this embodiment, the first film presser 331 is arranged in front of the second film presser 332 . When the first roll support shaft 301 is arranged behind the second roll support shaft 302 , the first film presser 331 is arranged behind the second film presser 332 .

The third film presser 333 is arranged at the same position as the first film presser 331 in the front-rear direction K1. The fourth film presser 334 is arranged at the same position as the second film presser 332 in the front-rear direction K1. In other words, the third film retainer 333 and the fourth film retainer 334 are staggered in the front-rear direction K1 in the same manner as the first film retainer 331 and the second film retainer 332 are arranged.

As shown in FIG. 61, the first film retainer 331 is connected to the first connection frame 325 via the first connector 335. As shown in FIG. The second film retainer 332 is connected to the first connection frame 325 via a second connector 336 . As shown in FIGS. 58 and 59, the third film retainer 333 is attached to the second connection frame 327 via the third connector 337. As shown in FIGS. As shown in FIG. 56, the fourth film presser 334 is attached to the third connecting frame 329 via the fourth connecting body 338. As shown in FIG.

The working machine 1 of this embodiment has the following effects.
The working machine 1 includes a first ground working machine 2 attached to the rear part of the traveling body 1A, a second ground working machine 3 mounted to the rear part of the first ground working machine 2 so as to be able to ascend and descend, and for planting seedlings in a field. A lift drive device 42 for driving the second ground work machine 3 to move up and down; chairs (first front chair 187A, second front chair 184B) on which workers who work on the second ground work machine 3 sit; A working machine connection mechanism 41 is provided for integrally connecting the second ground working machine 3 and the chairs 187A and 184B to the ground working machine 2 so as to be vertically movable.

According to this configuration, since the working machine connection mechanism 41 for integrally connecting the second ground working machine 3 and the chairs 187A and 187B to the first ground working machine 2 so as to be vertically movable, the traveling body 1A In a working machine including the first ground working machine 2 mounted and the second ground working machine 3 mounted to the second ground working machine 3 so as to be able to move up and down, the height of the chairs 187A and 187B on which the worker sits and the second The relationship with the height of the ground working machine 3 can be made constant. Therefore, even when the second ground working machine 3 is raised and lowered, workers sitting on the chairs 187A and 187B can easily work on the second ground working machine 3 .

The working machine connection mechanism 41 also includes a tool bar 43 to which the second ground working machine 3 is attached, and a chair support 150 connected to the tool bar 43 and supporting the chairs (the first front chair 187A and the second front chair 184B). , and a connection link mechanism 44 that connects the tool bar 43 and the chair support 150 to the first ground working machine 2 so as to be able to ascend and descend.
According to this configuration, the tool bar 43 and the chair support 150 can be raised and lowered integrally by the connecting link mechanism 44. Therefore, by raising and lowering the tool bar 43, the chairs 187A and 187B on which the worker sits and the second ground working machine can be moved. 3 can be raised and lowered integrally.

Further, the connecting link mechanism 44 has lower links 44A, 44B and an upper link 44C. and a second lower link 44B that connects the chair support 150 and the first ground working machine 2 on the other longitudinal end side of the tool bar 43, and the upper link 44C connects the chair support 150 and the first ground working machine 2 at the central portion of the tool bar 43 in the longitudinal direction.

According to this configuration, the connecting link mechanism 44 can be configured as a parallel link, so that the chair support 150 and the second ground working machine 3 can be raised and lowered parallel to the ground.
The connecting link mechanism 44 also has a connecting member 44D that connects the first lower link 44A and the second lower link 44B.
According to this configuration, the first lower link 44A and the second lower link 44B can be connected and integrated, thereby preventing twisting between the first lower link 44A and the second lower link 44B. can do.

The elevation drive device 42 also has an elevation cylinder C1 that connects the first ground working machine 2 and the upper link 44C.
According to this configuration, the upper link 44C is moved up and down by extending and contracting the lifting cylinder C1, and the chair support 150 and the second ground working machine 3 can be moved up and down with respect to the first ground working machine 2.

Further, the second ground working machine 3 includes a machine frame 37 that is connected to the working machine connection mechanism 41 and is moved up and down by the lifting drive device 42, and is supported by the machine frame 37 so as to be able to go up and down. and a planter 64 for planting seedlings, and the machine frame 37 is attached to the tool bar 43 .
According to this configuration, by raising and lowering the tool bar 43 by the elevation driving device 42, the planting tool 64 can be raised and lowered together with the machine frame 37 to adjust the planting depth.

The work machine 1 also includes spare seedling stands 280L, 280R on which containers CN containing seedling trays are placed.
According to this configuration, the container CN containing the seedling tray can be placed on the preliminary seedling stands 280L, 280R arranged above the first ground working machine 2. As shown in FIG. Therefore, the seedling tray can be replenished above the first ground working machine 2 in a state accommodated in the container CN without taking it out of the container CN.

The work machine 1 also includes a tube roll 290 wound with an irrigation tube for supplying water to the planted seedlings. .
According to this configuration, the tube roll 290 can be arranged at a lower position than when the tube roll 290 around which the irrigation tube is wound is arranged above the first ground working machine 2 . Therefore, attachment and detachment of the tube roll 290 can be easily performed.

The working machine 1 includes a first ground working machine 2 attached to the rear part of the traveling body 1A, a second ground working machine 3 attached to the rear part of the first ground working machine 2 and for planting seedlings in the field, A chair (first front chair 187A, second front chair 184B) arranged above the first ground working machine 2 and on which a worker who works on the second ground working machine 3 sits; and a position adjustment mechanism 230 capable of adjusting the positions of the chairs 187A and 184B.

According to this configuration, since the position adjusting mechanism 230 capable of adjusting the position with respect to the second ground working machine 3 for receiving the seedlings is provided, the chair can be adjusted according to changes in the distance between the rows of the seedlings to be planted, the height of the ridges, and the like. The positions of 187A and 187B can be adjusted.
The position adjusting mechanism 230 also has a first position adjusting mechanism 231 capable of adjusting the positions of the chairs (the first front chair 187A and the second front chair 184B) in the machine width direction K2, which is the width direction of the working machine 1. ing.

According to this configuration, the positions of the chairs 187A and 187B can be adjusted in the machine width direction K2 by the first position adjusting mechanism 231 in response to changes in the distance between rows of seedlings to be planted.
The position adjusting mechanism 230 also has a second position adjusting mechanism 232 that can adjust the positions of the chairs (first front chair 187A, second front chair 184B) in the front-rear direction K1.
According to this configuration, the positions of the chairs 187A and 187B can be adjusted in the front-rear direction by the second position adjustment mechanism 232 according to the physique of the operator.

The position adjusting mechanism 230 also has a third position adjusting mechanism 232 capable of vertically adjusting the positions of the chairs (the first front chair 187A and the second front chair 184B).
According to this configuration, the third position adjusting mechanism 233 adjusts the chairs 187A and 187B according to the height of the ridges, the height of the sleeves (sleeves fitted into the supply cups 171 and 172), the physique of the operator, and the like. The position can be adjusted vertically.

The work machine 1 also includes a work machine connection mechanism that integrally connects the second ground work machine 3 and the chairs (the first front chair 187A and the second front chair 184B) to the first ground work machine 2 so as to be vertically movable. 41, the work machine connection mechanism 41 includes a tool bar 43 to which the second ground work machine 3 is attached, and a chair support connected to the tool bar 43 and supporting chairs (first front chair 187A, second front chair 184B). 150 , and the positioning mechanism 230 is provided on the chair support 150 .

According to this configuration, the positions of the chairs 187A and 187B are adjusted by the position adjustment mechanism 230 after the relationship between the height of the chairs 187A and 187B on which the worker sits and the height of the second ground working machine 3 is fixed. can be done. Therefore, the positions of the chairs 187A and 187B with respect to the second ground working machine 3 can be adjusted accurately and easily.
In addition, the work machine 1 is arranged between the chairs (first front chair 187A, second front chair 184B) and the second ground work machine 3 and is positioned between the chairs (first front chair 187A, second front chair 184B). Equipped with footrest plates 235A and 235B on which a seated worker places his or her feet, the chair support 150 has mounting portions 260A and 260B to which the footrest plates 235A and 235B are detachably attached or can be opened and closed.

According to this configuration, by removing or opening the footrest plates 235A and 235B from the mounting portions 260A and 260B, access to the lower portion of the footrest plates 235A and 235B is facilitated. Therefore, for example, adjustment of the spring of the pressure device 20 of the rotary tiller 2, adjustment of the distance between the first transplant unit 36A and the second transplant unit 36B (adjustment between rows), adjustment of the position of the irrigation tube, etc. can be easily performed. It can be carried out.

The work machine 1 also includes a seedling supply device 38 for transferring a large number of supply cups 171 and 172 containing seedlings along a loop-shaped transfer route R1, and a seedling supply device 38 for placing the seedlings supplied to the seedling supply device 38. a feeder platform 188 , which is attached to the chair support 150 .
According to this configuration, since the seedling supply base 188 is attached to the chair support 150, the positional relationship between the seedling supply base 188 and the chair supported by the chair support 150 can be fixed. Therefore, seedlings can be stably supplied from the seedling supply table 188 to the seedling supply device 38 .

In addition, the seedling supply table 188 can be changed between a first position in which the seedling placement surface faces the horizontal direction and a second position in which the seedling placement surface faces the vertical direction.
According to this configuration, when seedlings are not supplied to the seedling supply device 38, the seedling placement table 188 is in the second posture, thereby preventing the seedling placement table 188 from interfering with the movement of the operator. .

The work machine 1 also includes a transplanter 3 having a traveling body 1A, a machine frame 37 attached to the rear of the traveling body 1A, and a planting device 39 supported by the machine frame 37 for planting seedlings in a field. , a lifting drive device 42 for lifting and lowering the machine frame 37 with respect to the traveling body 1A; a detection member 83 that moves up and down following irregularities in the field; a wire 97 that moves along with the vertical movement of the detection member 83; and a control valve 165 for switching the elevation drive device 42 between a first state in which the machine frame 37 is raised as the machine frame 97 moves and a second state in which the machine frame 37 is lowered.

According to this configuration, the movement of the wire 97 associated with the vertical movement of the detection member 83 that follows the unevenness of the field causes the control valve 165 to move between the first state in which the machine frame 37 of the transplanter 3 is raised and the second state in which the frame 37 of the transplanter 3 is lowered. Since it can be switched, it is possible to accurately adjust the planting depth with a simple configuration. As a result, variations in planting depth can be reduced.
The work machine 1 also includes a support frame 82 that supports the detection member 83 so as to be vertically movable with respect to the machine frame 37 . It is arranged passing above 83 .

According to this configuration, compared to the case where the support frame 82 is arranged along the side of the detection member 82, the adjacent detection members 83 (for example, the soil covering wheels 81L and 81R of the left first soil covering device 40AL and the right The interval between the earth covering rings 81L, 81R) of the first earth covering device 40AR can be narrowed. Therefore, it is possible to narrow the distance between rows for planting seedlings while avoiding interference between the support frames 82 .

In addition, the transplanter 3 includes a first transplant unit 36A arranged on one side in the width direction of the transplanter 3 and having a plurality of first planting devices 39AL and 39AR, and the other side in the width direction of the transplanter 3. a second implantation unit 36B having a plurality of second implantation devices 39BL, 39BR disposed in a second implantation device; a distance adjustment mechanism for adjusting the distance between the first implantation unit 36A and the second implantation unit 36B; A first angle adjusting mechanism for adjusting the relative angle between the first planting devices 39AL and 39AR, and a second angle adjusting mechanism for adjusting the relative angle between the plurality of second planting devices 39BL and 39BR. I have.

According to this configuration, the distance between the first implantation unit 36A and the second implantation unit 36B can be adjusted by the distance adjustment mechanism. In addition, the first angle adjustment mechanism and the second angle adjustment mechanism adjust the relative angle between the implantation devices in each implantation unit, thereby adjusting the distance between the implantation devices in each implantation unit. can. That is, it is possible to perform adjustment on a unit-by-unit basis and adjustment on a planting device-by-unit basis within each unit. Therefore, it is possible to adjust the row spacing corresponding to various planting forms such as 1-ridge 4-row, 2-ridge 2-row, and the like.

The working machine 1 also includes a toolbar 43 arranged behind the traveling body 1A and extending in the width direction, and the distance adjusting mechanism is attached movably along the toolbar 43 and fixed to the first transplanting unit 36A. and a second attachment 61B movably mounted along the toolbar 43 and secured to the second implantation unit 36B.

According to this configuration, the first and second implantation units 36A and 36B can be independently moved along the toolbar 43, so that the distance between the first and second implantation units 36A and 36B can be reduced. Adjustments can be made easily.
The machine frame 37 includes a first machine frame 37A to which a plurality of first planting devices 39AL and 39AR are mounted, and a second machine frame 37B to which a plurality of second planting devices 39BL and 39BR are mounted. The first implantation unit 36A has a first machine frame 37A, the second implantation unit 36B has a second machine frame 37B, and the first angle adjustment mechanism is adapted to adjust the plurality of first implantation devices 39AL, 39AR. The mounting angle with respect to the first machine frame 37A can be individually adjusted, and the second angle adjustment mechanism can individually adjust the mounting angle of the plurality of second planting devices 39BL and 39BR with respect to the second machine frame 37B.

According to this configuration, the mounting angle of the plurality of first planting devices 39AL and 39AR with respect to the first machine frame 37A and the mounting angle of the plurality of second planting devices 39BL and 39BR with respect to the second machine frame 37B are different. Since it can be adjusted individually, it is possible to easily adjust the distance between rows corresponding to various planting forms.
Further, the first transplanting unit 36A has a plurality of first soil covering devices 40AL, 40AR attached to the first machine frame 37A corresponding to the plurality of first planting devices 39AL, 39AR, respectively. The unit 36B has a plurality of second soil covering devices 40BL and 40BR attached to the second machine frame 37B corresponding to the plurality of second planting devices 39BL and 39BR, respectively. It has a first position adjusting section that adjusts the positions of the devices 40AL and 40AR in the width direction, and a second position adjusting section that adjusts the positions of the second soil covering devices 40BL and 40BR in the width direction.

According to this configuration, the positions of the plurality of soil-covering devices can be adjusted in accordance with the adjustment of the positions of the plurality of planting devices, so that the planting and soil-covering operations can be performed in accordance with various planting forms. becomes possible.
The work machine 1 also includes a prime mover E1, a main shaft 107 that receives power from the prime mover E1 and rotates about the axis extending in the width direction, and the rotational power of the main shaft 107 into the first transplant unit 36A and the second transplant unit 36B. the main shaft 107 includes a first rotating shaft 107A that rotates by receiving power from the prime mover E1, a second rotating shaft 107B that rotates by receiving power from the first rotating shaft 107A, A connecting shaft 107L that connects the first rotating shaft 107A and the second rotating shaft 107B, and the first rotating shaft 107A and the second rotating shaft 107B are movable in the width direction with respect to the connecting shaft 107L. be.

According to this configuration, the length of the main shaft 107 can be adjusted corresponding to the adjustment of the distance between the first implantation unit 36A and the second implantation unit 36B, and the length of the first implantation unit 36A and the second implantation unit 36B can be adjusted. Power transmission to the implantation unit 36B can be reliably performed.
The first rotating shaft 107A and the second rotating shaft 107B are spline shafts, and the connecting shaft 107L is a spline bearing with which the spline shafts mesh.

According to this configuration, it is possible to easily adjust the length of the main shaft 107 corresponding to the adjustment of the distance between the first transplant unit 36A and the second transplant unit 36B, and the first transplant unit 36A. And the transmission of power to the second implantation unit 36B can be performed reliably.
The working machine 1 is a traveling body 1A and a ground working machine attached to the rear of the traveling body 1A, and transfers a large number of supply cups 171 and 172 containing seedlings along a loop-shaped transfer route R1. and a ground working machine (second ground working machine) 3 having a seedling supply device 38 including a transfer mechanism 177 that feeds seedlings, and a planting tool 64 for planting the seedlings supplied from the seedling supply device 38 in a field. 177 is wound over a first rotating body 178, a second rotating body 179, the first rotating body 178 and the second rotating body 179, and rotates as the first rotating body 178 and the second rotating body 179 rotate. It has an endless cord body 180 that moves together with the supply cups 171 and 172 and a guide member 173 that guides the movement of the cord body 180 .

According to this configuration, since the guide member 173 that guides the movement of the endless cable 180 that moves together with the supply cups 171 and 172 is provided, the cable 180 is prevented from becoming slack and the supply cups 171 and 172 can be transferred. It can be done smoothly.
The seedling supply device 38 also has a device frame 176 that supports the transfer mechanism 177, and the guide member 173 includes first guide members 174L and 174R attached to the device frame 176, and a second guide member 175 that moves while contacting the first guide members 174L and 174R.

According to this configuration, as the cable 180 moves, the second guide member 175 moves while contacting the first guide members 174L and 174R. Therefore, the supply cups 171 and 172 can be smoothly transferred by preventing the cable 180 from becoming loose during movement.
Further, the supply cups 171 and 172 include storage portions 181a and 181b that store seedlings and have openings at their lower ends, mounting portions 182a and 182b that are attached to the cord body 180, and can be opened and closed to close the openings of the storage portions 181a and 181b. The seedling supply device 38 has a setting member 185 for setting the open positions D1 and D2 of the lids 183a and 183b in a part of the transfer route R1, and the guide member 173 is at least open. It guides the movement of the cord body 180 at positions D1 and D2.

According to this configuration, the guide member 173 can suppress swinging and loosening of the cable 180 at the open positions D1 and D2 of the lids 183a and 183b. Therefore, it is possible to prevent the lids 183a and 183b from opening at an unintended position or timing and dropping seedlings.
The work machine 1 also has tension applying bodies (fifth idler 255, sixth idler 256) that apply tension to the cord body 180, and the tension applying bodies apply tension to the cord body 180 at the open positions D1 and D2. Give.

According to this configuration, at the open positions D1 and D2 of the lids 183a and 183b, it is possible to suppress the swaying and loosening of the cord body 180 by the tension applying body. Therefore, it is possible to prevent the lids 183a and 183b from opening at an unintended position or timing and dropping seedlings.
The cord body 180 is a chain, and the tensioning bodies (fifth idler 255, sixth idler 256) are sprockets that mesh with the chain and rotate.

According to this configuration, the tension applying body can apply tension to the cord body 180 without hindering the rotation of the cord body 180 .
In addition, the first guide members 174L and 174R have extended surfaces 174La and 174Ra extending along the moving direction of the cord body 180, and the second guide member 175 includes an attachment portion 175a attached to the cord body 180, and a contact portion 175b that moves while contacting the extended surfaces 174La and 174Ra.

According to this configuration, the contact portion 175b of the second guide member 175 and the extended surfaces 174La and 174Ra of the first guide member 174L and the first guide member 174R can be brought into contact with each other. Therefore, it is possible to suppress the swing and slack of the cable body 180 in the machine width direction and the swing and slack of the cable body 180 in the vertical direction.
Further, the working machine 1 includes a traveling body 1A, a rotary tiller 2 attached to the rear portion of the traveling body 1A, and a ridge-raiser 51 having an attachment portion attached to the rotary tiller 2. The attachment portion is , front attachment portions 51La, 51Ra and 51Ma provided at the front portion of the ridge riser 51, and rear attachment portions 51Lb, 51Rb and 51Mb provided at the rear portion of the ridge riser 51.

According to this configuration, since the ridge riser 51 is attached to the rotary tiller 2 by the front attachment portions 51La, 51Ra, 51Ma and the rear attachment portions 51Lb, 51Rb, 51Mb, the load applied to the attachment portion of the ridge riser is reduced. can be dispersed. Therefore, even in a field that has not been sufficiently plowed in advance, it is possible to prevent an excessive load from being applied to the mounting portion of the ridge erector 51 .

Further, the rotary tiller 2 includes a tilling unit 18 for tilling a field, a rotary machine frame 11, a rotary cover 19 attached to the rotary machine frame 11 to cover the tilling unit 18, and a transmission for transmitting power to the tilling unit 18. a transmission case 12 that houses the mechanism, a mounting body 196 is attached to the rotary machine frame 11, the front mounting portions 51La, 51Ra, 51Ma are attached to the rotary cover 19 or the transmission case 12, The rear attachment portions 51Lb, 51Rb, 51Mb are attached to the attachment body 196. As shown in FIG.

According to this configuration, the front attachment portions 51La, 51Ra, 51Ma and the rear attachment portions 51Lb, 51Rb, 51Mb can be securely attached to the rotary tiller 2 . In particular, in the center drive type rotary tiller 2, if there is a ridger behind the transmission case 12, the ridger is likely to wear out due to residual plowing. , the wear and tear of the ribbing device behind the transmission case 12 can be prevented.

Further, the rotary cover 19 has an upper cover 19A that covers the top of the tillage section 18, a rear cover 19B that covers the rear of the tillage section 18, and a side cover 19C that covers the sides of the tillage section 18. The case 12 is arranged in the center in the width direction of the rotary tiller 2, and the ridge riser 51 includes side ridge risers 51L and 51R having front attachment portions 51La and 51Ra attached to the side cover 19C, and front attachment portions 51La and 51Ra attached to the side cover 19C. The portion 51Ma includes an intermediate ridged device 51M attached to the transmission case 12. As shown in FIG.

According to this configuration, the side ridge raisers 51L, 51R and the intermediate ridge raisers 51M can be reliably attached to different positions of the rotary tiller 2 in the width direction.
Further, the widthwise outer ends of the side ridges 51L and 51R are located outside the widthwise outer ends of the side cover 19C.
According to this configuration, the distance between the side ridge erectors 51L, 51R and the intermediate ridge erector 51M can be increased, so that the width of the ridges can be widened.

The side cover 19C includes a first side cover 19CL arranged on one side in the width direction and a second side cover 19CR arranged on the other side in the width direction. is a first side member 196A attached to the first side cover 19CL, a second side member 196B attached to the second side cover 19CR, and between the first side member 196A and the second side member 196B. The side ridgers 51L and 51R have a first side ridger 51L arranged on one side in the width direction and an intermediate member 196C arranged on the other side in the width direction. and a second side ridger 51R disposed with a rear mounting portion 51Lb of the first side ridger 51L attached to the first side member 196A and a rear mounting portion 51Lb of the second side ridger 51R. The attachment portion 51Rb is attached to the second side member 196B, and the rear attachment portion 51Mb of the intermediate ridge riser 51M is attached to the intermediate member 196C.

According to this configuration, the rear attachment portions 51Lb and 51Rb can be attached to the side cover 19C via the first side member 196A and the second side member 196B. Also, the rear attachment portion 51Mb can be arranged between the first side member 196A and the second side member 196B by the intermediate member 196C.
The work machine 1 also includes a transplanter 3 attached to the rear of the rotary tiller 2 and for planting seedlings in the field. Seedlings are planted in the ridge formed by 51.

According to this configuration, even in a field that has not been sufficiently plowed in advance, ridges can be surely formed by the ridge erector 51 and seedlings can be planted on the ridges formed by the transplanter 3.
Also, the multi-film laying device 300 is: A mulch film laying device installed at the rear of a traveling body 1A for laying a mulch film on ridges formed in a field, comprising a first film roll around which a mulch film to be laid on the first ridges UN1 is wound. 303, and a second roll support shaft 302 that supports a second film roll 304 around which the mulch film laid on the second ridge UN2 adjacent to the first ridge UN1 is wound. The first roll support shaft 301 and the second roll support shaft 302 extend in the width direction of the traveling body 1A and overlap in the width direction.

According to this configuration, the space between the first film roll 303 and the second film roll 303 can be narrowed, so that the mulch film can be laid with a narrower gap between two adjacent ridges. Therefore, it is possible to lay a mulch film satisfactorily even in an agricultural field in which many ridges are formed at narrow intervals.
Also, the first roll support shaft 301 and the second roll support shaft 302 are arranged to be shifted in the front-rear direction.

According to this configuration, the first roll support shaft 301 and the second roll support shaft 302 are displaced in the front-rear direction, thereby displacing the first roll support shaft 301 and the second roll support shaft 302 in the width direction of the traveling body 1A. You can definitely overlap.
Also, the first roll support shaft 301 and the second roll support shaft 302 are arranged to be shifted in the vertical direction.

According to this configuration, the first roll support shaft 301 and the second roll support shaft 302 are displaced in the vertical direction, thereby displacing the first roll support shaft 301 and the second roll support shaft 302 in the width direction of the traveling body 1A. You can definitely overlap.
In addition, the mulch film laying apparatus 300 includes a first soil covering member 321 for covering the end of the mulch film laid on the first ridge UN1 on the second ridge UN2 side with soil, and a mulch layer laid on the second ridge UN2. A second soil-covering member 322 for covering the end of the film on the first ridge UN1 side with soil is provided, and the first soil-covering member 321 and the second soil-covering member 322 are staggered in the front-rear direction.

According to this configuration, the interval between the first soil covering member 321 and the second soil covering member 322 can be narrowed in the width direction of the traveling vehicle 1A. Therefore, it is possible to satisfactorily cover the ends of the mulch film laid on the ridges formed at narrow intervals.
The first earth covering member 321 and the second earth covering member 322 are arranged so as to overlap each other in the width direction of the traveling vehicle 1A.

According to this configuration, after laying the mulch film by narrowing the space between two adjacent ridges (the first ridge and the second ridge), the first covering soil is applied to the end of the laid mulch film. The member 321 and the second soil covering member 322 can reliably cover the soil.
One of the first soil covering member 321 and the second soil covering member 322 is arranged behind the other soil covering member, and the lower end of one soil covering member is the lower end of the other soil covering member. located below.

According to this configuration, after the soil is covered by the front soil covering member of the first soil covering member 321 and the second soil covering member 322, the soil is gathered from a position deeper than the front soil covering member by the rear soil covering member. can be covered with soil. Therefore, since the soil is collected by the front soil covering member, the soil collected by the rear soil covering member is not insufficient, and both the first soil covering member 321 and the second soil covering member 322 can reliably cover the soil. It becomes possible.

In addition, the mulching film laying apparatus 300 includes a first film retainer 331 that holds down the end portion of the mulching film laid on the first ridge UN1 on the second ridge UN2 side, and a mulching film laid on the second ridge UN2. The first film presser 331 and the second film presser 332 are arranged to be shifted in the front-rear direction.

According to this configuration, when laying the mulch film by narrowing the space between two adjacent ridges (the first ridge and the second ridge), one end of the mulch film to be laid is The film presser 331 and the second film presser 332 can reliably press the film.
The work machine 1 also includes the mulch film laying device 300 and a transplanter 3 that is attached to the rear of the traveling body 1A and that plants seedlings in ridges.

According to this configuration, the operation of transplanting the seedlings and the operation of laying the mulch film can be performed together.
Although one embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative in all respects and is not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

1 work machine 3 transplanter 300 mulch film laying device 303 first film roll 301 first roll support shaft 304 second film roll 302 second roll support shaft 321 first soil covering member 322 second soil covering member 331 first film retainer 332 Second film presser UN1 First ridge UN2 Second ridge

Claims (8)

a mulching film laying device mounted on the rear of the traveling body for laying the mulch film on the ridge formed in the field ;
a rotary cultivator attached to the rear portion of the traveling body;
a ridger having an attachment portion attached to the rotary tiller;
A working machine comprising
The mounting portion includes a front mounting portion provided at a front portion of the ridge riser and a rear mounting portion provided at a rear portion of the ridge riser,
The multi-film laying device is
a first roll support shaft that supports a first film roll around which the mulch film laid on the first ridge is wound;
a second roll support shaft for supporting a second film roll on which a mulch film is laid on a second ridge adjacent to the first ridge;
with
The first roll support shaft and the second roll support shaft extend in the width direction of the traveling body and overlap in the width direction,
The first roll support shaft and the second roll support shaft are movable in the width direction, and the movement can change the overlapping range of the first roll support shaft and the second roll support shaft. can
The end of the first roll support shaft is supported by a first shaft support,
The end of the second roll support shaft is supported by a second shaft support,
The first shaft support and the second shaft support are attached to an intermediate connector that connects the rear attachment portion and an attachment attached to the rotary tiller. The working machine according to claim 1, wherein the first roll support shaft and the second roll support shaft are arranged to be shifted in the front-rear direction. The working machine according to claim 1, wherein the first roll support shaft and the second roll support shaft are arranged to be shifted in the vertical direction. a first soil covering member that covers the end portion of the mulch film laid on the first ridge on the second ridge side with soil;
a second soil covering member that covers the end of the mulch film laid on the second ridge on the first ridge side with soil;
with
The working machine according to any one of claims 1 to 3, wherein the first earth-covering member and the second earth-covering member are staggered in the front-rear direction. The working machine according to claim 4, wherein the first soil covering member and the second soil covering member are arranged so as to overlap each other in the width direction. Either one of the first soil covering member and the second soil covering member is arranged behind the other soil covering member,
The working machine according to claim 5, wherein a lower end portion of the one soil-covering member is positioned below a lower end portion of the other soil-covering member. a first film presser that presses the end of the mulch film laid on the first ridge on the second ridge side;
a second film presser that presses the end of the mulch film laid on the second ridge on the first ridge side;
with
The working machine according to any one of claims 1 to 6, wherein the first film presser and the second film presser are arranged to be shifted in the front-rear direction. The working machine according to any one of claims 1 to 7, further comprising a transplanter attached to the rear of the running body and for planting seedlings on the ridges.

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