JP2019208406A - Implement - Google Patents

Abstract

To perform excellently lifting operation of a planting tool.SOLUTION: An implement includes: a planting tool lifted by power of a driving source, lowered in the holding state of a seedling, and plunging into a field and planting the seedling; a compression spring energizing the planting tool in a lifting direction; and a spring operative mechanism operated by power for lifting the planting tool, for compressing the compression spring when lowering the planting tool, and elongating the compression spring when lifting the planting tool.SELECTED DRAWING: Figure 29

Description

  The present invention relates to a working machine for planting seedlings in a field, for example.

Conventionally, a working machine disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Document 1 has a planting tool that moves up and down by the power of a drive source, holds and lowers the seedling, and enters the farm to plant the seedling.

JP 2013-215177 A

The working machine disclosed in Patent Document 1 has a large load and its fluctuation required when lifting the planting tool. For this reason, the volume of the drive source becomes large, and the machine becomes large while being expensive and heavy.
Further, when the planting tool descends, it falls freely and moves faster than the drive source, and when it rises, it is lifted by the power of the drive source. For this reason, the planting tool may stagnate at the bottom dead center of the moving range and also vibrate, so that the seedling may be picked up.

In addition, seedlings are dropped and supplied to the planting tool at the top dead center position of the moving range. There is a case where a “shaking phenomenon” occurs in which the planting tool reverses without moving to the top dead center position after cutting.
Moreover, although the tension spring which urges | biases a planting tool upwards is provided, the urging | biasing force hardly acts in the top dead center position.

  Therefore, an object of the present invention is to provide a work machine that can solve the above-described problem.

  The work machine according to one aspect of the present invention is moved up and down by the power of the drive source, holds the seedling, descends and enters the farm to plant the seedling, and in a direction to raise the planting tool It operates by a compression spring that urges and the power to raise and lower the planting tool, compresses the compression spring when the planting tool is lowered, and extends the compression spring when the planting tool is raised. A spring operating mechanism.

  The spring actuating mechanism includes a movable rod that reciprocates in the axial direction along with an operation in which the planting tool reciprocates up and down, a holder that supports the movable rod so as to be movable in the axial direction, A restricting tool attached to the movable rod so as to be integrally movable, and the compression spring is interposed between the restricting tool and the holder, and the restricting tool is moved when the planting tool is lowered. It compresses by moving in the direction approaching the holder, and when the planting tool ascends, the restricting tool moves in a direction away from the holder and extends.

In addition, the spring operating mechanism has a rotating member that rotates once while the planting tool reciprocates up and down, and one end of the movable rod is pivotally supported on a portion that is biased from the rotation center of the rotating member. The restricting tool is attached between the one end of the movable rod and the holder.
Moreover, the said control tool is attached so that position change is possible to the axial center direction of the said movable rod.

Further, the work machine includes an adjustment unit that adjusts the relationship between the position of the planting tool and the expansion / contraction state of the compression spring.
The working machine includes a planting lifting mechanism that supports the planting tool so that the planting tool can be lifted and lowered, and a power transmission mechanism that transmits the power of the drive source to the planting lifting mechanism. A rotating shaft that is driven around the axis by the power of the drive source, and the planting tool is reciprocated up and down once and the compression spring is expanded and contracted by one rotation around the axis of the rotating shaft, and the adjustment The portion is a first transmission member that rotates integrally with the rotation shaft, and a second transmission member that is coupled to the first transmission member and rotates integrally with the first transmission member, and transmits power to the planting lifting mechanism. And a second transmission member that is capable of adjusting a rotational position of the rotation shaft around the axis of the transmission shaft.

  The working machine includes a planting lifting mechanism configured by a link mechanism that supports the planting tool so that the planting tool can be moved up and down, and the spring operating mechanism is operated by a swinging motion of the planting lifting mechanism to perform the compression. Extend and retract the spring.

  According to said structure, when a planting tool descend | falls, a compression spring compresses, so that the force which becomes resistance of free fall can fully be made to act on a planting tool, and when a planting tool raises, a compression spring By extending | stretching, the force to lift can fully be made to act on a planting tool. Thereby, the raising / lowering operation | movement of a planting tool can be performed favorably.

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. It is a systematic diagram of the power transmission device of a tractor. It is a side view of a rotary tiller. It is a top view of a rotary tiller. It is a side view which shows the transmission system of the motive power transmitted to the rotary tiller. It is a top view which shows the transmission system of the motive power transmitted to the rotary tiller. It is a block diagram which shows the power transmission system of a working machine. It is a block diagram which shows the control system of an electromagnetic clutch, and the power transmission system of a transplanter. It is a top view which shows the mounting state of the transplanter with respect to a rotary tiller. It is a side view of a side link. It is a top view of a side link. It is a top view of the connection part with respect to the toolbar of a side link. It is a side view of a center link and a raising / lowering cylinder. It is a top view of a center link and a raising / lowering cylinder. It is a block diagram of a raising / lowering drive apparatus and a control circuit. 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. It is a top view of a holding frame. It is a side view of a holding frame. It is a side view of a soil covering apparatus. It is a side view of the soil covering apparatus provided with the detection mechanism. It is a rear view of a soil covering apparatus. It is a side view of the attachment part of a 2nd angle sensor. It is a top view of the attachment part of a 2nd angle sensor. It is a top view which shows the power transmission system of a transplanter, an assist apparatus, etc. It is a side view which shows a planting apparatus, an assist apparatus, etc. It is a top view which shows a part of power transmission system of a transplanter. It is a top view of a planting apparatus. It is a side view of an assist device. It is a top view of an assist device. It is a side view which shows operation | movement of a planting apparatus and an assist apparatus. It is a side view which shows operation | movement of a planting apparatus and an assist apparatus. It is a side view which shows operation | movement of a planting apparatus and an assist apparatus. It is a side view which shows operation | movement of a planting apparatus and an assist apparatus. It is a side view of an adjustment part. It is a side view of the planting tool equipped with the intermediate hopper. It is a top view of the planting tool equipped with the intermediate hopper. It is a side view of an intermediate hopper. It is a rear view of an intermediate hopper. It is a side view which shows the relationship between a planting tool and a soil removal tool. It is a top view of a seedling supply device and a chair. It is a side view of a seedling supply device. It is a top view of a seedling supply device. It is an arrangement plan of a lid of a supply cup. It is a side view of a supply cup, an intermediate hopper, and a planting tool. It is a top view of a seedling stand. It is a top view of a seat frame. It is a side view of a seat frame. It is a side view of the connection part of a seat frame. It is a top view of the connection part of a seat frame. It is a top view which shows a sheet | seat lifting mechanism. It is a side view which shows a sheet | seat lifting mechanism. It is a side view which shows the operation state of a sheet | seat lifting mechanism. It is a side view of the working machine which concerns on other embodiment. It is a top view of the working machine which concerns on other embodiment. It is a side view of the arrangement part of a link member. It is a top view of the arrangement part of a link member. It is a side view which shows the state which raised the transplant machine and the seat frame. It is a top view of the detection mechanism which detects the ground height of a machine frame. It is a side view of the detection mechanism which detects the ground height of a machine frame. It is a top view of a soil covering apparatus. It is a side view of a machine frame rear part. It is a top view of a machine frame rear part. It is a side view of a detection part. It is a top view of a detection part. It is a top view of a supporting member. It is a circuit diagram of the control apparatus which controls a raising / lowering drive device. It is a side view which shows the operation | movement of a cam and a limit switch. It is a side view which shows the operation | movement of a cam and a limit switch. It is a side view which shows the operation | movement of a cam and a limit switch. It is a side view of another type of planting device. It is a systematic diagram of the power transmission mechanism which controls a transplanter by several electromagnetic clutches. It is a systematic diagram of the power transmission mechanism which controls a transplanter by several electromagnetic clutches. It is a block diagram which shows the control system of the electromagnetic clutch which concerns on other embodiment, and the power transmission system of a transplanter. It is a block diagram which shows the control system of the electromagnetic clutch which concerns on other embodiment, and the power transmission system of a transplanter. It is a block diagram which shows the control system of the electromagnetic clutch which concerns on other embodiment, and the power transmission system of a transplanter. It is a block diagram which shows the manual adjustment function between stocks. It is a block diagram which shows the automatic adjustment function between stocks.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 shows a working machine 1 that can plant seedlings (transplant) together with ground work (cultivation, etc.) while traveling. The work machine 1 includes a traveling body 1A and a ground work device 1B attached to the rear portion of the traveling body 1A. The ground work apparatus 1B includes a first ground work machine 2 that is mounted on the rear part of the traveling body 1A so as to be able to be raised and lowered, and a second ground work machine 3 that is mounted on the rear part of the first ground work machine 2 so that it can be raised and lowered. ing.

In this embodiment, the tractor which is a traveling vehicle is illustrated as the traveling body 1A. Further, a rotary tiller is illustrated as the first ground work machine 2. Moreover, the transplanting machine which plantes a seedling in a farm field is illustrated as a 2nd ground work machine. Hereinafter, the traveling body is referred to as a tractor 1A, the first ground working machine is referred to as a rotary tiller 2, and the second ground working machine is referred to as a transplanter 3.
The traveling body 1A is not limited to a tractor and may be another traveling vehicle. Moreover, the 1st ground work machine 2 is not limited to a rotary tiller, What is necessary is just a machine which works with respect to an agricultural field. For example, the first ground work machine 2 may be a ridger that raises ridges on a farm field. Moreover, although the rotary cultivator 2 illustrates the center drive type rotary cultivator, it may be a side drive type rotary cultivator.

FIG. 1 shows a side view of the work machine 1. Unless otherwise specified in the embodiment, the front side (left side in FIG. 1) of the driver seated in the driver's seat 5 of the tractor 1A is front, the rear side (right side in FIG. 1) is back, and the left side of the driver (FIG. 1). The description will be made with the front side of 1 as the left side and the right side of the driver (the back side in FIG. 1) as the right side.
Further, the 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 the machine width direction.

  The direction from the center in the machine width direction of the tractor 1A toward the right part or the left part will be described as the outside of the machine width. In other words, the outside of the machine width is the direction in the machine width direction K2 and away from the center of the tractor 1A in the machine width direction. A description will be given assuming that the right part of the tractor 1A in the machine width direction or the direction from the left part to the center part is inward of the machine width. That is, the machine width inward is the direction opposite to the machine width direction outward. In other words, the inward of the machine width is the direction in the machine width direction K2 and approaching the center of the tractor 1A in the machine width direction.

As shown in FIG. 1, the tractor 1 </ b> A includes a vehicle body 6 and a traveling device 7 including a front wheel 7 </ b> F attached to the front portion of the vehicle body 6 and a rear wheel 7 </ b> R attached to the rear portion of the vehicle body 6. The vehicle body 6 includes a prime mover (drive source) E1 and a power transmission case T1 coupled to the rear portion of the prime mover E1.
The prime mover E1 is, for example, a diesel engine. The prime mover E1 may be a gasoline engine, an LPG engine or an electric motor, or may be a hybrid type having an engine and an electric motor.

The power transmission case T1 is configured by directly connecting a clutch housing incorporating a clutch, a transmission case incorporating a transmission, a differential case incorporating a differential, and the like.
A driver's seat 6 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 in a rearward projecting manner. That is, the traveling body 1A has a power take-out shaft 22 that takes out the power of the prime mover E1. A steering wheel 8 is provided in front of the driver seat 5. The tractor 1A has a battery B1 mounted on the front.

FIG. 4 shows the power transmission device 4 that transmits the power of the prime mover E <b> 1 to the power take-out shaft 22 and the traveling device 7.
The power transmission device 4 includes a main propulsion shaft 4a, a main transmission unit 4b, an auxiliary transmission unit 4c, a shuttle unit 4d, a PTO clutch 4e, and a PTO propulsion shaft 4f.
Power from the prime mover E1 is transmitted to the main propulsion shaft 4a through a clutch so as to be intermittent. The main transmission unit 4b includes a plurality of gears and a shifter that changes the connection of the gears, and changes the rotation input from the main propulsion shaft 4a by appropriately changing the connection (meshing) of the plurality of gears with the shifter. And output (shift). Similar to the main transmission unit 4b, the sub-transmission unit 4c includes a plurality of gears and a shifter for changing the connection of the gears, and appropriately changes the connection (meshing) of the plurality of gears with the shifter. The rotation input from 4b is changed and output (shifted). The shuttle unit 4d transmits the rotational power from the sub-transmission unit 4c to the output shaft 4g in a normal rotation (forward rotation) state or reverse rotation (reverse rotation). The power transmitted to the output shaft 4g is transmitted to the rear wheel 7R via the rear wheel differential device 4h. The power transmitted to the output shaft 4g may also be transmitted to the front wheel 7F. That is, the prime mover E1 drives the traveling device 7.

The PTO clutch 4e transmits the rotational power from the main propulsion shaft 4a to the PTO propulsion shaft 4f so as to be intermittent. The rotational power from the prime mover E1 transmitted to the PTO propulsion shaft 4f is transmitted to the power take-out shaft 22 via a gear or the like. Therefore, the rotation of the power take-off shaft 22 is linked to the vehicle speed by changing the vehicle speed of the tractor 1A by changing the rotation speed of the prime mover E1.
As shown in FIG. 1, the rotary cultivator 2 is mounted on the rear portion of the tractor 1 </ b> A through a mounting mechanism such as a three-point link mechanism 9 so as to be lifted and lowered. 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. A lift link 10A that can swing up and down is provided at the rear of the vehicle body 6, and the lift link 10A is connected to the 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 part of the vehicle body 6, and the lower link 9B is raised and lowered by the vertical movement of the lift link 10A. Thereby, the rotary tiller 2 moves up and down.

  As shown in FIGS. 5 and 6, the rotary tiller 2 has a rotary machine frame 11. The rotary machine casing 11 includes 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 located at a substantially central portion of the rotary tiller 2 in the machine width direction K2. The front support frame 13F is disposed in front of the transmission case 12 so as to extend in the machine width direction K2. The rear support frame 13R is disposed 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. 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.

  A rotating shaft 16 having an axis in the machine width direction K2 is provided at the lower part of the transmission case 12 so as to protrude from one and the other in the machine width direction K2. A number of tilling claws 17 are fixed to the outer periphery of the rotary shaft 16 via brackets. As the rotary shaft 16 rotates about the axis in the direction of the arrow X1 in FIG. 5, the tilling claws 17 plow (plow) the field and release the plowed soil to the rear rear cover 19B. The rotating shaft 16 and the tilling claw 17 constitute a tilling unit 18 that tills the field.

  The upper part of the tillage part 18 is covered with an upper cover 19A. The rear of the tillage part 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 the pivot 19C so as to be rotatable about the axis in the machine width direction K2, and can swing up and down. The rear cover 19 </ b> B is biased downward by the pressure device 20. The pressure device 20 is a device that urges the rear cover 19B downward by the force of a spring. Accordingly, the rear cover 19 </ b> B leveles the traces plowed by the tiller 18.

In addition, the working machine 1 may include a soil cultivator that forms a ridge by cutting a groove in the soil cultivated by the cultivator 18. In this case, the rear cover 19B forms the upper surface of the bag.
As shown in FIG. 5, an input shaft (a so-called PIC shaft) 21 that takes power into the rotary tiller 2 is provided at the front portion of the upper portion of the transmission case 12. The input shaft 21 is interlocked and connected to the power take-off shaft 22 by a joint (universal joint) J1 (see FIG. 1). Therefore, power is transmitted from the power take-out 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 work machine) 2.

  As shown in FIGS. 7 and 9, a first gear (bevel gear) G <b> 1 is provided at the rear portion of the input shaft 21. 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. The first transmission shaft S1 is provided with a third gear (spur gear) G3. 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. The 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 the arrow X1 in FIG.

  As shown in FIGS. 7, 8, and 9, the power transmitted to the first transmission shaft S <b> 1 is provided on the upper portion of the transmission case 12 via the first transmission mechanism (chain winding transmission mechanism) 23 </ b> A. 2 is transmitted to the transmission shaft S2. A sixth gear G6 is provided at one end (right 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 rotation speed of the second transmission shaft S2. By measuring the rotation speed of the second transmission shaft S2, the rotation speed of E1 of the prime mover can be calculated.

  As shown in FIG. 8, in the vicinity of the sixth gear G6, a pulse sensor 25 that outputs a pulse signal (generates a pulse) by detecting the unevenness of the sixth gear G6 is provided. As the pulse sensor 25, for example, a magnetoresistive rotation sensor is employed. The pulse sensor 25 is connected to the control device 26, and the generated pulse is input to the control device 26. The control device 26 measures the rotation speed of the second transmission shaft S2 based on the signal from the pulse sensor 25 (by performing signal processing). By measuring the rotational speed of the second transmission shaft S2, the rotational speed of the prime mover E1 can be calculated, and the movement amount of the work machine 1 can be calculated from the rotational speed of the prime mover E1. The control device 26 is configured using a microcomputer provided with a CPU, an EEPROM, and the like.

  As shown in FIG. 8, an electromagnetic clutch 24 is provided at the other end (left end) of the second transmission shaft S2. The electromagnetic clutch 24 transmits the power transmitted to the second transmission shaft S2 to the third transmission shaft S3 in an intermittent manner. The power transmitted to the third transmission shaft S3 is transmitted to the transplanter 3 via the power transmission system shown in FIG. 9, and the transplanter 3 is driven (specifically, the transplanter 3 is equipped with the power). The planting tool 64 and the seedling supply devices 38A to 38C described later are driven).

  As shown in FIGS. 8 and 10, the electromagnetic clutch 24 is connected to a control device 26 and controlled by the control device 26. The electromagnetic clutch 24 is disconnected by a clutch disconnection signal from the control device 26 and then connected by a clutch connection signal from the control device 26. That is, the electromagnetic clutch 24 is disconnected for a required time by a command signal from the control device 26. In addition, 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 to 38C).

  In addition, an inter-stock setting device 27 is connected to the control device 26. The inter-strain setting device 27 is a device that sets (changes) a planting interval (between strains) of seedlings planted by the planting tool 64. The inter-strain setting unit 27 includes, for example, a dial-type operation member, and can set the seedling inter-strain according to the operation position (rotation position) of the operation member. In addition, the control device 26 includes a stock setting unit 26 a that controls the disconnection time of the electromagnetic clutch 24. The inter-strain setting unit 26a acquires signals from the pulse sensor 25 and the inter-strain setting unit 27, and based on the set value between the strains set by the inter-strain setting unit 27 and the movement amount of the work machine 1 obtained by the pulse sensor 25. Thus, the disconnection time of the electromagnetic clutch 24 is set. Thereby, it can plant accurately between the stocks which set up seedlings.

  At the time of planting work, the vehicle speed of the tractor 1A is changed by an accelerator operation member such as an accelerator pedal or an accelerator lever. By changing the vehicle speed of the tractor 1A only by the rotation of the prime mover E1, the driving of the planting tool 64 and the seedling supply devices 38A to 38C is interlocked with the vehicle speed. Since the driving (operation) of the planting tool 64 is linked to the vehicle speed, it is possible to prevent the locus of the planting tool 64 from changing with the change in the vehicle speed. It is possible to prevent the planting posture of the seedlings from being deteriorated.

As shown in FIG. 10, the control device 26 is connected to, for example, a battery B1 of the tractor 1A and supplied with power from the battery B1.
Next, a power transmission system from the third transmission shaft S3 to the transplanter 3 will be described with reference to FIGS.
The power transmitted to the third transmission shaft S3 is transmitted to the fourth transmission shaft S4 via the second transmission mechanism (chain winding transmission mechanism) 23B. The fourth transmission shaft S <b> 4 is provided with a worm 30, and the worm 30 meshes with the worm wheel 31. The worm wheel 31 is provided on the fifth transmission shaft S5, and the fifth transmission shaft S5 is connected to the output shaft 32 via a torque limiter (referred to as a first torque limiter) 33. Therefore, the power transmitted to the fourth transmission shaft S4 is transmitted to the output shaft 32 via the worm 30, the worm wheel 31, the fifth transmission shaft S5, and the first torque limiter 33. The output shaft 32 is connected to a joint (universal joint) J2. The power from the prime mover E1 is transmitted to the transplanter 3 via the joint J2.

It should be noted that at least one torque limiter may be provided in the power transmission path from the worm 30 to the planting lifting mechanism 139 described later.
By transmitting the power from the prime mover E1 to the transplanter 3 through the worm 30, the worm self-locking function (a state in which the worm cannot be turned from the worm wheel) causes the shaving of the planting tool 64 (planting tool 64). Is stopped before the stop position (top dead center position) and reverse rotation).

The first torque limiter 33 interrupts transmission of power (torque transmission) from the fifth transmission shaft S5 to the output shaft 32 when an overload is applied to the transplanter 3 side.
As shown in FIGS. 7 and 8, the worm 30, the worm wheel 31, and the first torque limiter 33 are built in a casing 28 provided on the upper front side of the transmission case 12, and the second transmission mechanism 23 </ b> B and the electromagnetic clutch 24 are The cover 28 is covered with a transmission cover 29 located on the left side of the casing 28.

Next, the transplanter 3 will be described.
As shown in FIGS. 2, 3, and 9, the transplanter 3 includes a plurality of transplant units (first to third transplant units 36A to 36C). The first transplanting unit 36A is provided on one side (left side) of the machine width direction K2 of the transplanter 3. The second transplanting unit 36B is provided on the other side (right side) of the transplanter 3 in the machine width direction K2. The third transplanting unit 36C is provided between the first transplanting unit 36A and the second transplanting unit 36B (the central part in the machine width direction K2 of the transplanting machine 3).

  The first transplant unit 36A includes one machine frame (referred to as a first machine frame) 37A, one seedling supply device (referred to as a 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. The first seedling supply device 38A, the first planting device 39A, and the first soil covering device 40A are mounted on the first machine casing 37A.

  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 a 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 casing 37B.

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

  Hereinafter, the first machine casing 37A, the second machine casing 37B, and the third machine casing 37C are collectively referred to as a machine casing 37. The first seedling supply device 38A, the second seedling supply device 38B, and the third seedling supply device 38C are also collectively referred to as a seedling supply device 38. The first planting device 39A, the second planting device 39B, and the third planting device 39C are also collectively referred to as a planting device 39. The first soil covering device 40A, the second soil covering device 40B, and the third soil covering device 40C are collectively referred to as a 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 seedling supplied from the seedling supply device 38 in the field. The planting device 39 is moved up and down by the power of the prime mover E1, holds the seedling, descends and enters the field to plant the seedling. 64. The soil covering device 40 is a device that gathers and covers the root part of the planted seedling and suppresses the root part of the seedling.

  As shown in FIG. 9, 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 soil covering devices 40A include a left first soil covering device 40AL corresponding to the first planting device 39AL and a first soil covering device 40AL corresponding to the first planting device 39AR. The plurality of second planting devices 39B include a left second planting device 39BL and a right second planting device 39BR. The plurality of second soil covering devices 40B include a left second soil covering device 40BL corresponding to the second planting device 39BL and a second soil covering device 40BL corresponding to the second planting device 39BR. The plurality of third planting devices 39C includes a left third planting device 39CL and a right third planting device 39CR. The plurality of third soil covering devices 40C include a left third soil covering device 40CL corresponding to the third planting device 39CL and a third soil covering device 40CL corresponding to the third planting device 39CR.

  Note that the number of transplant units may be two, or four or more. Also, there is no need to provide a plurality of transplant units, and one transplant unit may be provided. That is, the transplanter 3 may have at least one transplant unit. Therefore, the transplanter 3 should just have at least 1 seedling supply apparatus. Moreover, the planting apparatus should just be provided with respect to one transplant unit. In other words, 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 portion of the rotary cultivator 2 via a work machine connection mechanism 41 so as to be movable up and down. The transplanter 3 is driven up and down by a lift drive device 42 provided across the rotary tiller 2 and the transplanter 3.
As shown in FIG. 11, the work machine connection mechanism 41 includes 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 3 so as to be movable up and down.

  The tool bar 41 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. The transplanter 3 is attached to the tool bar 41. Specifically, the first transplanting unit 36A (first machine casing 37A), the second transplanting unit 36B (second machine casing 37B), and the third transplanting unit 36C (third machine casing 37C) are attached to the toolbar 43. ing. The first transplantation unit 36A, the second transplantation unit 36B, and the third transplantation unit 36C are attached to the tool bar 41 so that the position thereof can be adjusted in the machine width direction K2.

  The connecting link mechanism 44 includes a first side link 44A, a second side link 44B, and a central link 44C. The first side link 44A connects the left end portions of the rear support frame 13R and the tool bar 43 to each other. The second side link 44B connects the rear support frame 13R and the right ends of the toolbar 43 to each other. The central link 44 </ b> C connects the transmission case 12 and the central portion of the toolbar 43.

  As shown in FIGS. 12 and 13, the first side link 44 </ b> A includes a link 47, a front bracket 48 on which one end (front end) of the link 47 is pivotally supported, and the other end (rear end) of the link 47. And a rear bracket 48 that is pivotally supported. A boss 47 a is fixed to the front end portion of the link 47, and a boss 47 b is fixed to the rear end portion of the link 47. The front bracket 48 includes a first plate 48a and a second plate 48b that are arranged opposite to each other in the machine width direction K2 and fixed on the rear support frame 13R. A boss 47a is disposed between the first plate 48a and the second plate 48b, and the boss 47a is supported by the front bracket 48 via the pivot 50F so as to be rotatable about the axis in the machine width direction K2. . The said link 47 is a link which connects the machine frame 37 to the rotary tiller 2 so that raising / lowering is possible.

  As shown in FIGS. 12, 13, and 14, the rear bracket 48 includes a first plate portion 49a and a second plate portion 49b, and a first plate portion 49a and a second plate arranged opposite to each other in the machine width direction K2. It has the 3rd board part 49c which connects the upper parts of the board part 49b. A boss 47b is disposed between the first plate portion 49a and the second plate portion 49b, and the boss 47b is supported by the rear bracket 49 via the pivot 50R so as to be rotatable about the axis in the machine width direction K2. ing. The third plate portion 49c is attached to the tool bar 43 by a fixture 51 having a U bolt or the like.

Since the second side link 44B is configured in the same manner as the first side link 44A, description thereof is omitted.
As shown in FIGS. 15 and 16, the center link 44 </ b> C is pivotally supported by the link 52 and the link 53 that are arranged to face each other in the machine width direction K <b> 2 and one end (front end) of the link 52 and the link 53. It has a front bracket 54 and a rear bracket 55 on which the other ends (rear ends) of the link 52 and the link 53 are pivotally supported.

A boss 52 a is fixed to one end (front end) of the link 52, and a boss 52 b is fixed to the other end (rear end) of the link 52. A boss 53 a is fixed to one end (front end) of the link 53, and a boss 53 b is fixed to the other end (rear end) of the link 53.
The front bracket 54 is fixed to the upper wall 12a of the transmission case 12. The front bracket 54 includes a first side wall 54a and a second side wall 54b that are arranged to face each other in the machine width direction K2, and a front wall 54c that connects the front end portions of the first side wall 54a and the second side wall 54b. A boss 52a and a boss 53a are arranged between the first side wall 54a and the second side wall 54b, and the boss 52a and the boss 53a rotate around the axis in the machine width direction K2 to the front bracket 54 via the pivot 56F. It is supported freely.

  The rear bracket 55 has a first member 58 and a second member 57. The 1st member 58 has the 1st side wall 58a, the 2nd side wall 58b, and the upper wall 58c which connects the upper end of the front part of the 1st side wall 58a and the 2nd side wall 58b. The first member 58 is fixed to the front surface and the lower surface of the tool bar 43. The 2nd member 57 has the 1st side wall 57a, the 2nd side wall 57b, and the connection wall 57c which connects the front end and upper and lower ends of the 1st side wall 57a and the 2nd side wall 57b. The first side wall 57a is bolted to the first side wall 58a at the middle of the upper and lower sides, and the second side wall 57b is bolted to the second side wall 58b at the middle of the upper and lower sides.

  A support cylinder 60 penetrating the first side wall 57a and the second side wall 57b is fixed to the upper portion of the second member 57, and the pivot 56R is supported by the support cylinder 60 so as to be rotatable around the axis in the machine width direction K2. ing. A boss 52b is rotatably fitted to the left part of the pivot 56R, and a boss 53b is rotatably fitted to the right part of the pivot 56R. Further, the second member is provided with a support shaft 63 at a lower portion across the first side wall 57a and the second side wall 57b.

In the work machine connection mechanism 41 having the above configuration, the link 47 swings up and down around the pivot 50F, and the link 52 and the link 53 swing up and down around the pivot 56F, so that the transplanter 3 is parallel. Move up and down (lift).
As shown in FIGS. 15 and 16, the elevating drive device 42 has an elevating cylinder (hydraulic actuator) C1. The elevating cylinder C1 is composed of a hydraulic cylinder having a cylinder body C1a and a piston rod C1b. The base of the connecting member 62 is attached to the tip of the piston rod C1b. The distal end portion of the connecting member 62 is positioned between the first side wall 57a and the second side wall 57b through the connecting wall 57c. A boss 59a is provided on the bottom side of the cylinder body C1a, and a boss 59b is provided on the tip of the connecting member 62. The boss 59a is rotatably supported by the pivot shaft 56F, and the boss 59b is rotatably supported by the support shaft 63.

  When the elevating cylinder C1 is extended (the piston rod C1b is advanced from the cylinder body C1a), the link 47, the link 52, and the link 53 swing downward, and the transplanter 3 (machine frame 37) is lowered. Further, when the elevating cylinder C1 is contracted (the piston rod C1b is retracted), the link 47, the link 52, and the link 53 swing upward, and the transplanter 3 (machine frame 37) is raised.

  As shown in FIG. 17, the elevating drive device 42 includes an electromagnetic valve 71 that controls the elevating cylinder C1. The electromagnetic valve 71 is a three-position direction switching valve that can be switched to a neutral position 71a, a raised position 71b, and a lowered position 71c. The electromagnetic valve 71 includes a first solenoid 71d and a second solenoid 71e connected to the control device 26. The solenoid valve 71 is connected to the cylinder body C1a of the elevating cylinder C1 and is connected to the hydraulic pump P1 and the hydraulic oil tank 72.

  When the raising command signal is transmitted from the control device 26 to the first solenoid 71d, the first solenoid 71d is excited and the electromagnetic valve 71 is switched to the raised position 71b. Thereby, hydraulic fluid is supplied to the rod side of the cylinder body C1a, the elevating cylinder C1 contracts, and the machine frame 37 rises. When a lowering command signal is transmitted from the control device 26 to the second solenoid 71e, the second solenoid 71e is excited and the electromagnetic valve 71 is switched to the lowering position 71c. As a result, hydraulic oil is supplied to the bottom side of the cylinder body C1a, the elevating cylinder C1 extends, and the machine casing 37 descends.

  In addition, the raising / lowering drive apparatus 42 may be comprised with the electric cylinder (electric actuator) or the electric hydraulic cylinder (electric hydraulic actuator). The electric cylinder is an electrically driven cylinder, for example, a cylinder in which a ball screw is rotated around an axis by an electric motor to move a ball screw nut, and a rod is advanced and retracted by the movement of the ball screw nut. The electric hydraulic cylinder is, for example, an actuator in which an electric motor, an oil tank, a hydraulic pump, a valve, a hydraulic cylinder, and the like are integrated. The hydraulic pump is rotated by the rotation of the electric motor and the valve is switched to operate the hydraulic cylinder. Cylinder.

Next, the machine casing 37 of the transplanter 3 will be described with reference to FIGS. 18, 19, and 20.
Since the first machine frame 37A, the second machine frame 37B, and the third machine frame 37C have the same configuration, only one of these machine frames will be described, and description of the other machine frames will be omitted.
The machine frame 37 includes a main frame 65 and a connection bracket 61. A seedling supply device 38A, a planting device 39A, a soil covering device 40A, and the like 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 and the like are mounted, and the seedling supply device 38C, the planting device 39C, the soil covering device 40C, and the like are mounted on the main frame 65 of the third machine casing 37C.

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

  The main frame 65 has a plurality of frame members (first frame member 65a to twentieth 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 extending in the front-rear direction K1. The second frame member 65b constitutes the upper right part of the main frame 65, and is arranged extending 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 the rear portions of the first frame member 65a and the second frame member 65b. The fourth frame member 65d is located in front of the fifth frame member 65e. The sixth frame member 65f is disposed at the upper part of the main frame 65 and at the center in the machine width direction K2. The sixth frame member 65f is arranged to extend in the front-rear direction K1 below the third frame member 65c to the fifth frame member 65e. The seventh frame member 65g is arranged in parallel below the sixth frame member 65f. The eighth frame member 65h connects the lower surface of the front end portion of the sixth frame member 65f and the front end portion of the seventh frame member 65g. The ninth frame member 65i and the tenth frame member 65j connect the sixth frame member 65f and the seventh frame member 65g at the rear part. The ninth frame member 65i is located in front of the tenth frame member 65j.

  The eleventh frame member 65k is located 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 65w is located between the second frame member 65a and the sixth frame member 65f, and extends downward from the third frame member 65c. A connecting bracket 61 is disposed between the eleventh frame member 65k and the twelfth frame member 65w. 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 65w.

  The thirteenth frame member 65m extends downward from a portion closer to the rear of the central portion of the first frame member 65a. The fourteenth frame member 65n extends downward from the rear end portion of the first frame member 65a. The fifteenth frame member 65o extends downward from the rear portion of the second frame member 65b. The sixteenth frame member 65p extends downward from the rear end portion of the second frame member 65b. The seventeenth frame member 65q connects the lower ends of the fourteenth frame member 65n and the sixteenth frame member 65p. The eighteenth frame member 65r extends downward from the front portion of the sixth frame member 65f. The nineteenth frame member 65s and the twentieth frame member 65t extend rearward from the lower part of the twelfth frame member 65w. The nineteenth frame member 65s is located above the twentieth frame member 65t.

  A first mounting plate 65u is fixed between lower portions of the eighth frame member 65h and the eleventh frame member 65k. The second mounting plate 65v is fixed across the 19th frame material 65s, the 20th frame material 65t, and the 18th frame material 65r. The first planting frame 78L is bolted to the first mounting plate 65u, and the second planting frame 78R is bolted to the second mounting plate 65v.

In addition, the 1st planting frame 78L and the 2nd planting frame 78R may be attached so that position adjustment is possible in the machine width direction K2.
As shown in FIG. 11, the work machine 1 includes a holding frame 66 that extends rearward from the work machine connection mechanism 41 and supports the rear portion of the transplanter 3.
As shown in FIGS. 21 and 22, the holding frame 66 includes a plurality of support rods (first support rod 67L, second support rod 67R) and holding rods 69 provided at the rear of the support rods 67L and 67R. Have

Note that at least one support rod may be provided. Further, the holding rod 69 does not need to be configured by a single member, and may be configured by connecting a plurality of members.
The first support rod 67L is disposed on the left side of the third machine casing 37C. The first support rod 67L includes a horizontal member 68A and a vertical member 68B. The front end of the horizontal member 68 </ b> A is fixed (connected) to the upper surface of the toolbar 43 and extends rearward from the toolbar 43. The horizontal member 68A extends to the rear part of the first machine casing 37A to the third machine casing 37C, and the rear end portion is positioned in front of the rear ends of the first machine casing 37A to the third machine casing 37C. Yes. The vertical member 68B has an upper end fixed to the lower surface of the rear end of the horizontal member 68A and extends downward from the rear end of the horizontal member 68A.

The second support rod 67R is disposed on the right side of the third machine casing 37C. The second support rod 67R also has a horizontal member 68A and a vertical member 68B similar to the first support rod 67L.
The holding rod 69 is disposed below the rear part of the first machine casing 37A to the third machine casing 37C. The holding rod 69 is provided from the left end portion of the first machine casing 37A to the right end portion of the second machine casing 37B, and is fixed to the lower ends of the vertical members 68B of the first support rod 67L and the second support rod 67R. ing. Further, the holding rod 69 is in contact with the lower surface of the seventh frame member 65g. In other words, the seventh frame member 65g (machine frame 37) is placed on the holding rod 69 so as to be movable in the machine width direction K2. The holding rod 69 is fixed to the seventh frame member 65g of each of the machine casings 37A to 37C by a fixture 70 having a U bolt or the like. By removing the fixture 70, the first machine frame 37A to the third machine frame 37C can move (slidable) on the holding rod 69 in the machine width direction K2. The fixing tool 70 can fix the seventh frame member 65g at a plurality of positions on the holding rod 69. The holding rod 69 may not be fixed to the seventh frame material 65g.

  In the present embodiment, by supporting the rear portions of the first machine frame 37A to the third machine frame 37C by the holding frame 66, vibrations of the first machine frame 37A to the third machine frame 37C can be suppressed, and the planting depth can be stabilized. And the mutual heights of the first machine casing 37A to the third machine casing 37C can be matched. Further, when assembling or adjusting the position of the first machine frame 37A to the third machine frame 37C, it is possible to reduce the labor during the assembly or the position adjustment by sliding on the holding rod 69.

Here, the soil covering apparatus 40 will be described.
Since the structures of the first soil covering device 40A, the second soil covering device 40B, and the third soil covering device 40C are configured similarly, the first soil covering device 40A will be described, and the structures of the second soil covering device 40B and the third soil covering device 40C. Description of is omitted.
Moreover, since the structure of 1st earth covering apparatus 40AL and 1st earth covering apparatus 40AR is comprised similarly, the structure of 1st earth covering apparatus 40AL is demonstrated and description of the structure of 1st earth covering apparatus 40AR is abbreviate | omitted.

As shown in FIGS. 23, 24, and 25, the first earth covering device 40AL includes a plurality of earth covering rings (a left earth covering ring 81L and a right earth covering ring 81R), and a earth covering ring that supports the earth covering ring 81L and the earth covering ring 81R. Frame 82.
The cover ring 81L and the cover ring 81R rotate the upper surface of the farm field behind the planting tool 64, put the soil on the root part of the planted seedling, cover the soil, and suppress the root part of the seedling.

The soil covering frame 82 includes an attachment member 83, a plurality of vertical support members (left vertical support member 84L, right vertical support member 84R), and a plurality of foil brackets (left foil bracket 85L, right foil bracket 85R). And a plurality of connection links (left connection link 86L, right connection link 86R) and a plurality of springs (biasing members) 87.
The attachment member 83 includes a first member 83A, a second member 83B, a first support shaft 83C, and a second support shaft 83D. The first member 83A is located above the soil covering ring 81R. The first member 83A is attached to an attachment plate 88 provided over the ninth frame member 65i and the thirteenth frame member 65m so that the height can be adjusted. The second member 83B is located above the cover ring 81L, and is disposed on the side (left side) below the first member 83A with a gap. The first support shaft 83C is provided across the lower part of the first member 83A and the upper part of the second member 83B. The second support shaft 83D is located below the first support shaft 83C, and is provided across the lower portion of the first member 83A and the lower portion of the second member 83B.

  The vertical support member 84L is disposed behind the second member 83B. A third support shaft 89A and a fourth support shaft 89B located below the third support shaft 89A are provided on the upper portion of the vertical support member 84L. The vertical support member 84R is disposed behind the first member 83A. On the upper portion of the vertical support member 84R, a fifth support shaft 90A and a sixth support shaft 90B positioned below the fifth support shaft 90A are provided.

The wheel bracket 85L is attached to the lower part of the vertical support member 84L, and the earthen ring 81L is rotatably attached to the wheel bracket 85L. The wheel bracket 85R is attached to the lower part of the vertical support member 84R, and a cover ring 81R is rotatably attached to the wheel bracket 85R.
The connecting link 86L includes an upper link 91A provided over the first support shaft 83C and the third support shaft 89A, and a lower link 91B provided over the second support shaft 83D and the fourth support shaft 89B. The connecting link 86R includes an upper link 92A provided over the first support shaft 83C and the fifth support shaft 90A, and a lower link 92B provided over the second support shaft 83D and the sixth support shaft 90B. The connecting link 86L and the connecting link 86R are parallel links, and are inclined so as to move downward as going backward.

The cover ring 81L and the cover ring 81R can move up and down independently.
The springs 87 are constituted by tension coil springs, and four springs 87 are provided in this embodiment. The two springs 87 are provided over the second support shaft 83D and the third support shaft 89A, and the other two springs 87 are provided over the second support shaft 83D and the fifth support shaft 90A. The spring 87 urges the cover rings 81L and 81R downward.

  In the first soil covering device 40AL configured as described above, the earth covering ring 81L is supported by the connecting link 86L so as to be movable up and down, and the earth covering ring 81R is supported by the connecting link 86R so as to be movable up and down, and the earth covering ring 81L and The soil covering ring 81 </ b> R is biased in the grounding direction by a spring 87. Accordingly, the cover ring 81L and the cover ring 81R move up and down following the unevenness of the field.

In addition, when the position of the planting apparatus can be adjusted in the machine width direction K2, the soil covering apparatus is configured so that the position can be adjusted in the machine width direction K2 correspondingly.
As shown in FIG. 24, the transplanter 3 has a height detection mechanism 93 that detects the height of the machine frame 37 with respect to the ground. As shown in FIG. 3, the ground height is a relative height H1 of the lower end of the machine frame 37 with respect to the planting surface W1 on which the seedling is planted. The planting surface W1 is a field surface that is leveled by the rear cover 19B of the rotary cultivator 2. When a cocoon is formed in the field, the planting surface W1 is an upper surface of the cocoon. The height detection mechanism 93 may be provided in any of the first soil covering device 40A, the second soil covering device 40B, and the third soil covering device 40C. Here, a case where the first earth covering device 40A is provided will be described as an example.

The height detection mechanism 93 includes a detection member 94, a first connection link 95, and a first angle sensor 73. The detection member 94 is a member that moves up and down following the unevenness of the field. In the present embodiment, the cover ring 81L or the cover ring 81R.
The 1st connection link 95 is a member which connects the detection member 94 to the machine frame 37 so that a vertical motion is possible. In the present embodiment, the first connection link 95 is the connection link 86L when the detection member 94 is the cover ring 81L, and the connection link 86R when the detection member 94 is the cover ring 81R.

The first angle sensor 73 is a sensor that detects the rotation angle of the first connection link 95. The first angle sensor 73 is composed of, for example, a potentiometer. The first angle sensor 73 is attached to the attachment member 83.
The height detection mechanism 93 includes a detection arm 97 having one end attached to the first angle sensor 73 (rotation shaft of the potentiometer), and an interlock that links and connects the other end of the detection arm 97 and the first connection link 95. And a link 98. The interlocking link 98 is connected to the third support shaft 89A or the fifth support shaft 90A, for example.

When the detection member 94 moves up and down following the unevenness of the field, the first connection link 95 swings up and down and the detection arm 97 swings up and down via the interlocking link 98. When the first angle sensor 73 detects the swing of the detection arm 97, the rotation angle of the first connection link 95 is detected. Thereby, the change of the ground height H1 of the machine casing 37 can be detected.
As illustrated in FIGS. 26 and 27, the work machine 1 includes a second connection link 101 that connects the machine frame 37 to the rotary tiller 2 so as to be movable up and down, and a second angle that detects a rotation angle of the second connection link 101. Sensor 74. In the present embodiment, the second connecting link 101 is the link 47 of the first side link 44A. The second connecting link 101 may be the link 47 of the second side link 44B, or the link 52 or the link 53 of the central link 44C.

The second angle sensor 74 is composed of, for example, a potentiometer. Further, the second angle sensor 74 is disposed on the side of the front bracket 48 and is attached to a mounting bracket 99 erected on the rear support frame 13R.
One end of the interlocking arm 100 is connected to the second angle sensor 74 (rotation shaft of the potentiometer). The other end of the interlocking arm 100 is attached to the second connecting link 101 so as to be integrally rotatable.

When the second connecting link 101 swings up and down, the interlocking arm 100 swings up and down together with the second connecting link 101. When the second angle sensor 74 detects the swing of the interlocking arm 100, the rotation angle of the second connecting link 101 is detected.
As shown in FIG. 17, the first angle sensor 73 and the second angle sensor 74 are connected to the control device 26.

  Further, a height setting member 75 is connected to the control device 26. The height setting member 75 is an operation member for setting (determining) the ground height H1 of the machine casing 37 to a desired ground height (referred to as a set ground height). Consists of members. The planting depth of the seedling planted by the planting tool 64 can be set by performing the setting operation of the set ground height with the height setting member 75. Moreover, the planting depth of a seedling can be changed by changing the set ground height set by the height setting member 75 by the height setting member 75.

The set ground height is determined from the rotation angle of the first connection link 95 detected by the first angle sensor 73 and the rotation angle of the second connection link 101 detected by the second angle sensor 74.
The control device 26 includes a height setting unit 26b and a height control unit 26c.
The height setting unit 26b acquires a signal from the height setting member 75 and sets the ground height H1 of the machine casing 37 to the set ground height determined by the height setting member 75. In addition, when the height setting member 26 changes the set ground height with the height setting member 75, the height setting unit 26b drives the lifting drive device 42 to change the ground height H1 of the machine frame 37 to the set ground height. .

  The height control unit 26 c controls the lift drive device 42 to set the ground height H 1 of the machine frame 37 to the set ground height based on the rotation angle of the first connection link 95 detected by the first angle sensor 73. In other words, the control device 26 controls the rotary frame tiller 2 to move up and down the machine frame 37 based on the detection result of the height detection mechanism 93 so that the ground height H1 of the machine frame 37 becomes the set ground height. To do.

As described above, the control device 26 controls the lifting drive device 42 so as to raise and lower the machine frame 37 following the unevenness of the field.
Specifically, the detection member 94 moves up following the upper surface of the field from the state in which the ground height H1 of the machine frame 37 is the set ground height, that is, the ground height H1 of the machine frame 37 is set to the set ground height. If it becomes relatively lower than this, the elevator drive device 42 is driven (the elevator cylinder C1 is contracted) so that the ground height H1 of the machine frame 37 becomes the set ground height, and the machine frame 37 is moved up. Further, the detection member 94 moves down following the upper surface of the field from the state in which the ground height H1 of the machine frame 37 is the set ground height, that is, the ground height H1 of the machine frame 37 is relative to the set ground height. Is increased, the elevator drive device 42 is driven so that the ground height H1 of the machine casing 37 becomes the set ground height (the elevator cylinder C1 is extended) to lower the machine casing 37.

Independent of the rotary cultivator 2 attached to the rear part of the tractor 1A, the transplanting machine 3 can be raised and lowered according to the unevenness of the field, thereby improving the seedling planting accuracy.
Next, the power transmission mechanism 105 that transmits the power from the prime mover E1 to the seedling supply device 38 and the planting device 39 will be described.
As shown in FIGS. 9, 28, and 29, the front portion of the third machine casing 37C is provided with an intake shaft 103 located at the center in the machine width direction K2, and the intake shaft 103 is connected to a joint J2. Are connected. The intake shaft 103 has a seventh gear (bevel gear) G7 at the rear. The seventh gear G7 meshes with an eighth gear (bevel gear) G8 in a gear case 106 attached to the second member 57 of the rear bracket 55. The eighth gear G8 is attached to the sixth transmission shaft S6 so as to be integrally rotatable. The power transmitted to the sixth transmission shaft S6 is transmitted to the main shaft 107 via the third transmission mechanism (chain winding transmission mechanism) 23C. The third transmission mechanism 23C includes a drive sprocket 108a that rotates integrally with the sixth transmission shaft S6, a driven sprocket 108b that rotates integrally with the main shaft 107, and a chain 180c wound around the drive sprocket 108a and the driven sprocket 108b. Configured.

  The main shaft 107 is provided over the first machine casing 37A, the third machine casing 37B, and the second machine casing 37C. The main shaft 107 includes a plurality of shafts and a coupling that interlocks and connects the shafts, and can be expanded and contracted in accordance with the position adjustment of the machine frames 37A to 37C in the machine width direction K2. Power is transmitted from the main shaft 107 to the seedling supply device 38 and the planting device 39 of each of the transplanting units 36A to 36C.

  Specifically, the power transmitted to the main shaft 107 is transmitted to the first seedling supply device 38A via the fourth transmission mechanism (bevel gear transmission mechanism) 23D and the fifth transmission mechanism (chain winding transmission mechanism) 23E. Power is transmitted to the second seedling supply device 38B via a sixth transmission mechanism (bevel gear transmission mechanism) 23F and a seventh transmission mechanism (chain winding transmission mechanism) 23G, and an eighth transmission mechanism (bevel gear transmission mechanism) 23H and The power is transmitted to the third seedling supply device 38C via the 9 transmission mechanism (chain winding transmission mechanism) 23I.

  Further, the power transmitted to the main shaft 107 is transmitted to a cylinder shaft (referred to as a first cylinder shaft) 110A via a torque limiter (referred to as a second torque limiter) 109A, and a torque limiter (referred to as a third torque limiter) 109B. Power is transmitted to the cylindrical shaft (referred to as the second cylindrical shaft) 110B via the shaft, and power is transmitted to the cylindrical shaft (referred to as the third cylindrical shaft) 110C via the torque limiter (referred to as fourth torque limiter) 109C.

  The power transmitted to the first cylinder shaft 110A is transmitted to the left first planting device 39AL via the tenth transmission mechanism 23J, and the eleventh transmission mechanism 23K, the rotation shaft (referred to as the first rotation shaft) 111A, It is transmitted to the right first planting device 39AR via the twelfth transmission mechanism 23L. The power transmitted to the second cylinder shaft 110B is transmitted to the left second planting device 39BL via the thirteenth transmission mechanism 23M, and the fourteenth transmission mechanism 23N, the rotation shaft (referred to as the second rotation shaft) 111B, It is transmitted to the right second planting device 39BR via the fifteenth transmission mechanism 23P. The power transmitted to the third cylindrical shaft 110C is transmitted to the left third planting device 39CL via the sixteenth transmission mechanism 23Q, and the seventeenth transmission mechanism 23R, the rotation shaft (referred to as the third rotation shaft) 111C, It is transmitted to the right third planting device 39CR via the eighteenth transmission mechanism 23S.

The rotating shafts 111A to 111C are driven around the axis by the power of the prime mover E1.
As shown in FIG. 30, the fourth torque limiter 109 </ b> C includes a hub 112, a spring (biasing spring) 113, a spring receiver 114, and a meshing portion 115. The hub 112 is coupled to the main shaft 107 by spline fitting or the like. That is, the hub 112 is fitted to the main shaft 107 so as to be able to rotate integrally and move in the axial direction. The spring 113 is formed by a coil spring, for example, and is interposed between the hub 112 and the spring receiver 114. The spring receiver 114 is fitted on the main shaft 107 and is restricted from moving away from the hub 112. The meshing portion 115 is configured by meshing engagement teeth provided on the hub 114 and meshing teeth provided on the third cylindrical shaft 110C. When the meshing portion 115 is engaged by the urging force of the spring 113, power is transmitted from the main shaft 107 to the third cylindrical shaft 110C. When an overload acts on at least one of the third planting device 39CL and the third planting device 39CR, the overload acts on the third cylindrical shaft 110C, and thereby the hub 114 resists the biasing force of the spring 113. Moves and the meshing portion 115 is disengaged. Thereby, power transmission (torque transmission) from the main shaft 107 to the third cylindrical shaft 110C is interrupted.

Since the second torque limiter 109A and the third torque limiter 109B are also configured in the same manner as the fourth torque limiter 109C, description of the structures of the second torque limiter 109A and the third torque limiter 109B is omitted. Further, the first torque limiter 33 is configured similarly to the third torque limiter 109B.
When an overload acts on at least one of the first planting device 39AL and the first planting device 39AR, the meshing portion 115 is disengaged, the transmission of power from the main shaft 107 to the first cylinder shaft 110A is cut off, and the second planting is performed. When an overload acts on at least one of the device 39BL and the second planting device 39BR, the meshing portion 115 is disengaged and the transmission of power from the main shaft 107 to the second cylindrical shaft 110B is interrupted.

Further, the first torque limiter 33 is configured similarly to the fourth torque limiter 109C. When an overload is applied to the seedling supply device 38, the meshing portion of the first torque limiter 33 is disengaged, and the transmission of power from the fifth transmission shaft S5 to the output shaft 32 is interrupted.
Next, the planting device 39 will be described.
Since the first planting device 39A, the second planting device 39B, and the third planting device 39C are similarly configured, the structure of the third planting device 39C illustrated in FIGS. 29 and 31 will be described. The description of the structure of the first planting device 39A and the second planting device 39B will be omitted. Further, the left third planting device 39CL and the right third planting device 39CL are configured in the same manner except that they are configured symmetrically, so that description of common parts will be omitted.

As shown in FIGS. 29 and 31, the third planting device 39CL and the third planting device 39CR are arranged side by side in the machine width direction K2, and are arranged at different positions in the front-rear direction K1. The third planting device 39CL is attached to the transplant frame 78L, and the third planting device 39CR is attached to the transplant frame 78R.
The third planting device 39CL includes a planting tool 64 and a planting lifting mechanism 139. 3rd planting apparatus 39CR has the planting tool 64 and the planting raising / lowering mechanism 139 similarly to 3rd planting apparatus 39CL.

Hereinafter, the planting tool 64 in the third planting apparatus 39CL may be referred to as a planting tool 64CL, and the planting tool 64 in the third planting apparatus 39CR may be referred to as a planting tool 64CR. Further, the planting lifting mechanism 139 in the third planting apparatus 39CL may be referred to as a planting lifting mechanism 139CL, and the planting lifting mechanism 139 in the third planting apparatus 39CR may be referred to as a planting lifting mechanism 139CR.
The planting tool 64 is a member for planting seedlings in a farm field (a cocoon). The planting tool 64 has a beak shape whose tip is directed downward (see FIG. 34), and includes a front component 140 and a rear component 141. The planting tool 64 can be opened and closed by separating and approaching the front component 140 and the rear component 141 in the front-rear direction K1 (see FIG. 29). The front component 140 and the rear component 141 are urged in a closing direction by a tension spring.

  As shown in FIG. 29, the sixteenth transmission mechanism 23Q includes a drive sprocket 116L that rotates integrally with the third cylindrical shaft 110C, a driven sprocket 117L that is supported by the first planting frame 78L via a support shaft 118L, and a drive. The chain 119L is wound around the sprocket 116L and the driven sprocket 117L. Power is transmitted from the second cylindrical shaft 110C to the support shaft 118L by the sixteenth transmission mechanism 23Q, and the support shaft 118L rotates.

  The eighteenth transmission mechanism 23S includes a driving sprocket 116R that rotates integrally with the third rotating shaft 111C, a driven sprocket 117R supported by the second planting frame 78R via a support shaft 118R, a driving sprocket 116R, and a driven sprocket 117R. And a chain 119R wound around. Power is transmitted from the third rotating shaft 111C to the support shaft 118R by the 18th transmission mechanism 23S, and the support shaft 118R rotates.

  The tenth transmission mechanism 23J and the thirteenth transmission mechanism 23M are configured similarly to the sixteenth transmission mechanism 23Q. Further, in the first transplanting unit 36A, the drive sprocket 116L of the tenth transmission mechanism 23J rotates integrally with the first cylindrical shaft 110A, and the tenth transmission mechanism 23J rotates from the first cylindrical shaft 110A to the support shaft of the first implantation device 39A. Power is transmitted to 118L. In the second transplanting unit 36B, the drive sprocket 116L of the thirteenth transmission mechanism 23M rotates integrally with the second cylindrical shaft 110B, and the support shaft of the second transplanting device 39B from the second cylindrical shaft 110B by the thirteenth transmission mechanism 23M. Power is transmitted to 118L.

  The twelfth transmission mechanism 23L and the fifteenth transmission mechanism 23P are configured by this, similarly to the eighteenth transmission mechanism 23S. Further, in the first transplanting unit 36A, the drive sprocket 116R of the twelfth transmission mechanism 23L rotates integrally with the first rotation shaft 111A, and the support shaft of the first implantation device 39A from the first rotation shaft 111A by the twelfth transmission mechanism 23L. Power is transmitted to 118R. In the second transplanting unit 36B, the drive sprocket 116R of the fifteenth transmission mechanism 23P rotates integrally with the second rotation shaft 111B, and the support shaft of the second transplanting device 39B is moved from the second rotation shaft 111B by the fifteenth transmission mechanism 23P. Power is transmitted to 118R.

As shown in FIGS. 29 and 30, the planting lifting mechanism 139 is a device that supports the planting tool 64 and lifts the planting tool 64. Specifically, the planting lifting mechanism 139CL is a device that lifts and lowers the planting tool 64CL, and the planting lifting mechanism 139CR is a device that lifts and lowers the planting tool 64CR.
The planting lifting mechanism 139 includes a first case 120, a second case 121, and an attachment member 122. The first case 120 of the planting elevating mechanism 139L is rotatably supported by the first planting frame 78L via a support shaft 118L. The first case 120 of the planting lifting / lowering mechanism 139R is rotatably supported by the second planting frame 78R via a support shaft 118R. The second case 121 is rotatably supported on the free end side of the first case 120. The attachment member 122 is supported by the second case 121. A planting tool 64 is supported by the mounting member 122.

  As shown in FIG. 34, when the rotating shaft 111C and the drive sprocket 116R rotate in the direction of arrow Y3, the support shaft 118R rotates in the direction of arrow Y1. Similarly, when the drive sprocket 116L rotates in the arrow Y3, the support shaft 118L rotates in the arrow Y1 direction. When the support shaft 118R (118L) rotates in the direction of the arrow Y1, the first case 120 also rotates together. In the first case 120 and the second case 121, when the first case 120 rotates in the direction of the arrow Y1, the second case 121 moves in the direction opposite to the first case 120 (indicated by the arrow) in conjunction with the rotation of the first case 120. A power transmission device is provided to rotate in the Y2 direction (see FIGS. 34 to 35).

Further, when the first case 120 and the second case 121 are rotated, the mounting member 122 moves in parallel up and down while moving back and forth, and the planting tool 64 follows the elliptical locus A1 shown in FIG. Draw up and down (up and down).
As shown in FIG. 34, seedlings are dropped and supplied to the planting tool 64 at the raised position (top dead center position). At this time, the planting tool 64 is in a closed state, and the seedling N1 is accommodated and held in the planting tool 64. Thereafter, as shown in FIGS. 35 and 36, the planting tool 64 descends while holding the seedling N1, and the lower part enters the field F1. In addition, the planting tool 64 opens when it enters the farm field F1, forms a planting hole F2 in the farm field F1, and drops the seedling N1 downward and releases it. Thereby, the seedling N1 is planted in the field F1.

In the planting device 39 having the above-described configuration, when the rotation shaft 111C (111A, 111B) makes one rotation, the support shaft 118R also makes one rotation, and when the support shaft 118R makes one rotation, the planting tool 64 reciprocates up and down once.
As described above, the third planting device 39CL and the third planting device 39CR are arranged in different positions in the front-rear direction K1 along the machine width direction K2. Thereby, two transplanted seedlings are planted in a staggered manner in the cocoon by one transplanting unit (one of the seedlings adjacent in the machine width direction K2 is planted with a position shifted forward or backward relative to the other).

In the present embodiment, the left and right planting tools 64 are lifted and lowered simultaneously. Further, when the planting tool 64 stops, the left and right planting tools 64 stop at the top dead center position.
As shown in FIG. 9, the transplanter 3 has a plurality of assist devices 151. The plurality of assist devices 151 include a first assist device 151A provided in the first transplant unit 36A, a second assist device 151B provided in the second transplant unit 36B, and a third assist device 151 provided in the third transplant unit 36C. Assist device 151C. The assist device 151 is a device that assists the lifting operation of the planting tool 64.

Note that the number of assist devices 151 corresponding to the number of transplant units is provided. That is, when there is one transplant unit, there is also one assist device 151. Therefore, the transplanter 3 has at least one assist device 151.
Since the first assist device 151A, the second assist device 151B, and the third assist device 151C are configured similarly, the third assist device 151C illustrated in FIGS. 28 and 29 will be described, and the first assist device 151A, Description of the structure of the two assist device 151B is omitted. As shown in FIGS. 32 and 33, the assist device 151 includes an assist spring 152 and a spring operating mechanism 153.

The assist spring 152 is composed of a compression spring (specifically, a compression coil spring). Moreover, the assist spring 152 is urging | biasing in the direction which raises the planting tool 64. FIG.
The spring actuating mechanism 153 is operated by power that moves the planting tool 64 up and down (power of the prime mover E1), and compresses the assist spring 152 when the planting tool 64 descends and assists when the planting tool 64 ascends. This is a mechanism for extending the spring 152.

  The spring operating mechanism 153 includes a rotating member 154 that is provided on the rotating shaft 111C so as to be integrally rotatable. The rotating member 154 of the first assist device 151A is provided on the rotating shaft 111A, and the rotating member 154 of the second assist device 151B is provided on the rotating shaft 111B. Since the rotation member 154 is provided so as to be integrally rotatable with the rotation shaft 111C, the rotation member 154 rotates once while the planting tool 64 reciprocates up and down once.

  The rotating member 154 is provided on one end side of the rotating shaft 111C, and includes a first member 154a and a second member 154b. The first member 154a is coupled to the rotating shaft 111C by spline fitting or the like and rotates integrally with the rotating shaft 111C. The first member 154a is formed in a circular shape centered on the axis of the rotation shaft 111C. The second member 154b is fixed to the first member 154a with a bolt or the like, and protrudes radially outward from the first member 154a. A support shaft 158 is attached to the protruding end side of the second member 154b.

As shown in FIGS. 32 and 33, the spring operating mechanism 153 includes a movable rod 155, a holder 156, and a restricting tool 157.
The movable rod 155 is formed of a round bar, and is arranged in the front-rear direction behind the support shaft 158. A boss 159 constituted by a bearing is provided at one end (front end side) of the movable rod 155. The boss 159 is rotatably fitted to the support shaft 158. Therefore, one end of the movable rod 155 is pivotally supported by a portion of the rotating member 154 that is deviated from the rotation center.

  The holder 156 is rotatably attached to a holder bracket 160 fixed to the lower surface of the fourth frame member 65d. The holder 156 has a through hole 156a through which the rear portion of the movable rod 155 is inserted. The through hole 156a is formed in a direction orthogonal to the rotational axis of the holder 156, and the holder 156 supports the movable rod 155 so as to be movable in the axial direction. While the rotating member 154 rotates once, the planting tool 64 reciprocates up and down and the movable rod 155 reciprocates in the axial direction. That is, the movable rod 155 reciprocates once in the axial direction along with the movement of the planting tool 64 reciprocating up and down once.

  The restricting tool 157 is formed in a cylindrical shape, is provided between the holder 156 and one end portion (boss 159) of the movable rod 155, and is fitted to the outside of the movable rod 155 so as to be movable in the axial direction. . The restricting tool 157 is attached to the movable rod 155 so as not to move in the axial direction by a pin 161 penetrating the restricting tool 157 and the movable rod 155. That is, the restricting tool 157 is attached to the movable rod 155 so as to be movable together. A plurality of pin holes 162 formed in the movable rod 155 and through which the pins 161 are inserted are formed at intervals in the axial direction of the movable rod 155. Therefore, the attachment position of the restricting tool 157 can be changed in the axial direction of the movable rod 155.

  The assist spring 152 is interposed between the restricting tool 157 and the holder 156. A movable rod 155 is inserted through the assist spring 152. One end (front end) of the assist spring 152 abuts on a spring receiver 163 provided on the restricting tool 157, and the other end (rear end) of the assist spring 152 contacts a spring receiver 164 provided on the holder. It touches. Therefore, the urging force Z1 of the assist spring 152 acts in a direction in which the movable rod 155 presses the protruding end portion (the connecting portion of the movable rod 155) of the rotating member 154 (see FIG. 34).

FIG. 34 shows a state where the planting tool 64 is located at the top dead center of the vertical movement range. At this time, the boss 159 is positioned in front of the rotation shaft 111C, and the axis 155a of the movable rod 155 is orthogonal to the axis of the rotation shaft 111C and the extension of the axis of the support shaft 158. Therefore, at this time, the urging force Z <b> 1 of the assist spring 152 does not act on the planting tool 64.
When the rotating member 154 rotates in the Y3 direction from the position of the top dead center by rotating the rotating shaft 111C, the planting tool 64 is lowered as shown in FIG. The upper side of 111C is rotated rearward to move the movable rod 155 rearward. When the movable rod 155 moves rearward, the restricting tool 157 moves in a direction approaching the holder 156, and the assist spring 152 is compressed. Therefore, the assist spring 152 is compressed by the restricting tool 157 moving in the direction approaching the holder 156 when the planting tool 64 is lowered. At this time, the urging force Z1 of the assist spring 152 acts in a direction opposite to the rotation direction Y3 of the rotation shaft 111C, and acts in a direction in which the planting tool 64 is raised. Thereby, it can prevent that the planting tool 64 moves faster than the force which drives this planting tool 64 by free fall. Thereby, it can prevent that the planting tool 64 stagnates and vibrates at the bottom dead center of the up-and-down movement range. In addition, it is possible to prevent the planting tool 64 from picking up the seedling by stagnating and vibrating at the bottom dead center position. Thereby, in order to improve a planting attitude | position, the front-end | tip (lower end) of the planting tool 64 can be narrowed.

  As shown in FIG. 36, in the state where the planting tool 64 is located at the bottom dead center of the vertical movement range, the axis 155a of the movable rod 155 is an extension of the axis of the rotating shaft 111C and the axis of the support shaft 158. It is orthogonal to the line. Therefore, at this time, the urging force Z <b> 1 of the assist spring 152 does not act on the planting tool 64. That is, the assist spring 156 is compressed while the planting tool 64 moves from the top dead center position to the bottom dead center position.

  As shown in FIG. 37, when the planting tool 64 is lifted from the bottom dead center position, the protruding end of the rotating member 154 rotates the lower side of the rotating shaft 111C forward and moves the movable rod 155 forward. When the movable rod 155 moves forward, the restricting tool 157 moves away from the holder 156, and the assist spring 152 extends. Therefore, the assist spring 152 extends when the restricting tool 157 moves away from the holder 156 when the planting tool 64 moves up. The assist spring 152 extends while the planting tool 64 moves from the bottom dead center position to the top dead center position.

  The urging force Z1 of the assist spring 152 acts in the rotational direction Y3 of the rotating shaft 111C when the planting tool 64 is raised. As a result, when the assist spring 152 assists the ascent of the planting tool 64 and stops the planting tool 64 at the top dead center, the electromagnetic clutch 24 is disconnected before the top dead center to improve the delivery of seedlings. In addition, it is possible to prevent a situation where the planting tool 64 reverses without moving to the top dead center due to inertia.

  In addition, in the case where the planting tool is lifted upward by a tension spring as in the prior art, almost no load is applied to the planting tool at the top dead center position, but the assist spring 152 is configured by a compression spring. In addition, a large spring load can be obtained at the top dead center position of the planting tool 64 by urging the rotating member 154 rotated by the rotating shaft 111C. Further, by providing the assist device 151 in the middle of the power transmission system that drives the planting tool 64, the assist device 151 can be made compact.

In addition, the transplanter 3 of this embodiment has a mechanism (planting tool stop mechanism) for stopping the planting tool 64 at the top dead center position.
As illustrated in FIGS. 33 and 38, the work machine 1 includes an adjustment unit 166 that adjusts the relationship between the position of the planting tool 64 and the stretched state (compressed state) of the assist spring 152. The adjusting unit 166 is provided on the other end side of the rotating shaft 111C.

In the first transplantation unit 36A, the adjustment unit 166 is provided on the other end side of the rotation shaft 111A, and in the second transplantation unit 36B, the adjustment unit 166 is provided on the other end side of the rotation shaft 111B.
The adjustment unit 166 is coupled to the rotation shafts 111C, 111A, and 111B (referred to as the rotation shaft 111) by spline fitting or the like, and is integrally connected to the first transmission member 167 and integrally rotated. And a drive sprocket 116 </ b> R that is a second transmission member that transmits power to the planting lift mechanism 139.

  A driving sprocket (second transmission member) 116R is attached to the first transmission member 167 by a plurality of bolts 168a to 168c. The bolt 168a is threaded into (threaded into) a screw hole 170a formed in the first transmission member 167 through a bolt insertion hole 169a formed in the drive sprocket 116R. The bolt 168b is threaded into a screw hole 170b formed in the first transmission member 167 through a bolt insertion hole 169b formed in the drive sprocket 116R. The bolt 168c is screwed into a screw hole 170c formed in the first transmission member 167 through a bolt insertion hole 169c formed in the drive sprocket 116R.

  Each of the bolt insertion holes 169a to 169c is formed as an arc-shaped long hole with the axis of the rotation shaft 111 as the center. Therefore, by loosening the bolts 168a to 168c, the drive sprocket 116R can be rotated around the rotation shaft 111C with respect to the first transmission member 167. In other words, the rotational position of the drive sprocket 116R around the axis of the rotary shaft 111 can be adjusted with respect to the first transmission member 167. By rotating the drive sprocket 116R with respect to the first transmission member 167, the position of the planting tool 64 is changed without changing the position of the movable rod 155. Therefore, by adjusting the position of the drive sprocket 116R around the rotation shaft 111 with respect to the first transmission member 167, the relationship between the position of the planting tool 64 and the compressed state of the assist spring 152 can be adjusted.

As shown in FIGS. 39 and 40, the planting device 39 includes a soil removal tool 125 and an intermediate hopper 126.
The earth dropping tool 125 is attached to the lower end of a support rod 127 whose upper end is pivotally supported by the planting frame 78L (78R) so as to swing back and forth. The support rod 127 is provided with a rotatable roller 129 via a bracket member 128, and the roller 129 is in contact with the outer periphery of the cam ring 130 fixed to the first case 120. A tension spring 131 is provided between the support rod and the planting frame 78L (78R). The spring 131 urges the support rod 127 in a direction in which the roller 129 contacts the outer periphery of the cam ring 130.

  As shown in FIGS. 39 to 42, the intermediate hopper 126 is a member that relays seedlings that are dropped and supplied toward the planting tool 64. The intermediate hopper 126 has a hopper body 132 and a stay 133. The hopper main body 132 is made of rubber, and has an upper end and a lower end formed in a cylindrical shape having an opening. The hopper body 132 is formed in a truncated cone shape that becomes tapered as it goes downward in a side view. The upper end of the hopper body 132 is formed in an oval shape that is long in the front-rear direction K1, and the lower end of the hopper body 132 is formed in a circular shape. The hopper body 132 is disposed above the planting tool 64, and the lower end portion is inserted into the upper part of the planting tool 64. A plurality of slits 132 a are formed in the lower portion of the hopper body 132. The slits 132 a are formed upward from the lower end of the hopper body 132 and are formed at intervals in the circumferential direction of the hopper body 132. Thereby, the lower part of the hopper main body 132 is made into a goodwill shape.

  The stay 133 is made of sheet metal, and has a main body attachment portion 133a and a stay attachment portion 133b. The main body attachment portion 133 a is formed in an annular shape surrounding the upper end portion of the hopper main body 132. The upper end portion of the hopper main body 132 is attached to the main body attaching portion 133a. The stay attachment portion 133 b extends downward from the main body attachment portion 133 a and is attached to an attachment plate 134 fixed to the attachment member 122.

  As shown in FIG. 43, the earth dropping tool 125 swings back and forth as the cam ring 130 rotates integrally with the first case 120 and the roller 129 rolls on the outer periphery of the cam ring 130. Moreover, the soil drop tool 125 is located at a position where it does not interfere with the planting tool 64 while the planting tool 64 moves from the top dead center position to the bottom dead center position. When ascending, the soil enters the planting tool 64 from above and drops the soil in the planting tool 64.

  In addition, the earth dropping tool 125 passes through the lower portion of the intermediate hopper 126 when entering the planting tool 64. Conventionally, the intermediate hopper is made of sheet metal, and a hole through which the earth dropping tool 125 passes is formed. The seedling may fall from this hole. In the present embodiment, there is no hole through which the earth dropping tool 125 passes in the intermediate hopper 126, and the seedling can be prevented from falling. Moreover, since the lower part of the hopper main body 132 becomes a goodwill shape, the earth dropping tool 125 can pass. Further, since the hopper body 132 is made of rubber, it can be designed without considering interference with other members, and a large hopper can be formed so that the seedlings are not boring. Further, since the hopper body 132 is made of rubber, processing is also easy.

Next, the seedling supply device 38 will be described.
As shown in FIG. 3, the first seedling supply device 38A is arranged above the first planting device 39A, and the second seedling supply device 38B is arranged above the second planting device 39B, and the third seedling The supply device 38C is disposed above the third planting device 39B.
The seedling supply device 38 is a device that drops and supplies the seedling to the planting tool 64 positioned below.

  As shown in FIG. 44, the third seedling supply device 38C is longer in the front-rear direction than the first seedling supply device 38A and the second seedling supply device 38B. The front part of the third seedling supply device 38C is located at the same position in the front-rear direction as the first seedling supply device 38A and the second seedling supply device 38B, and the rear part of the third seedling supply device 38C is the first seedling supply. It protrudes backward from the device 38A and the second seedling supply device 38B (the first transplant unit 36A and the second transplant unit 36B).

Since the first seedling supply device 38A, the second seedling supply device 38B, and the third seedling supply device 38C have the same configuration except for the front and rear lengths, the third seedling supply device is shown in FIGS. The structure of 38C is illustrated and described, and the description of the first seedling supply device 38A and the second seedling supply device 38B is omitted.
As shown in FIGS. 45 and 46, the third seedling supply device 38C has a device frame 176 supported by the third machine casing 37C. Similarly, the first seedling supply device 38A also has a device frame supported by the first machine frame 37A, and the second seedling supply device 38B also has a device frame supported by the second machine frame 37B.

As shown in FIGS. 44 and 46, the seedling supply device 38 has a large number of supply cups 171 and 172 into which seedlings are introduced. The multiple supply cups include multiple first supply cups 171 and multiple second supply cups 172. The 1st supply cup 171 and the 2nd supply cup 172 are arrange | positioned along the loop-shaped transfer path | route P extended in the front-back direction K1.
Specifically, the first supply cup 171 and the second supply cup 172 are arranged in a loop so as to exhibit a long oval shape in the front-rear direction K1 in plan view. Further, the first supply cup 171 and the second supply cup 172 are alternately arranged along the oval transfer path P.

  As shown in FIG. 46, the first supply cup 171 and the second supply cup 172 are intermittently transferred in the direction of arrow Y4 along the transfer path R1 by the transfer mechanism 177. The transfer mechanism 177 includes a first rotating body 178, a second rotating body 179, and a rope body 180. The first rotating body 178 and the second rotating body 179 are configured by sprockets, and the rope body 180 is configured by an endless chain wound around the first rotating body 178 and the second rotating body 179. The first rotator 178 and the second rotator 179 are supported by the device frame 176 so as to be rotatable about a vertical axis (an axis extending in the vertical direction). The first supply cup 171 and the second supply cup 172 are disposed along the cable body 180 on the outer peripheral side of the cable body 180. The first rotating body 178 rotates by receiving power through the ninth transmission mechanism 23I, whereby the rope body 180, the first supply cup 171 and the second supply cup 172 move in the direction of arrow Y4.

Power is transmitted to the first rotating body 178 of the first rotating body 178 of the first seedling supply device 38A via the fifth transmission mechanism 23E, and the first rotating body 178 of the second seedling supply device 38B is transmitted to the first rotating body 178. The power is transmitted through the seventh transmission mechanism 23G.
As shown in FIG. 48, the first supply cup 171 includes an accommodating portion 181a that accommodates the seedling N1 to be charged, an attachment portion 182a that is attached to the cable body 180, and a lid 183 that closes the opening at the lower end of the accommodating portion 181a. Have Similarly, the second supply cup 172 includes a storage portion 181b, a mounting portion 182b, and a lid 183b. The lids 183a and 183b are pivotally supported by hinges below the housing portions 181a and 181b so that the lower end openings of the housing portions 181a and 181b can be opened and closed. When the lids 183a and 183b are closed, the seedling N1 can be held in the accommodating portions 181a and 181b, and when the lids 183a and 183b are opened, the seedling N1 can be discharged downward from the accommodating portions 181a and 181b. .

  As shown in FIG. 47, the lid 183a of the first supply cup 171 has a first engagement portion 184a. The lid 183b of the second supply cup 172 has a second engagement portion 184b. The first engaging portion 184a protrudes to the inner peripheral side of the transfer path R1 (the cord body 180) of the supply cups 171 and 172. The second engaging portion 184b protrudes on the outer peripheral side of the transfer path R1 (the cord body 180) of the supply cups 171 and 172.

  As shown in FIG. 46, the lid 183a of the first supply cup 171 opens on the left side of the transfer path R1. The position indicated by reference sign D1 is a first opening position (opening position on one side in the machine width direction) where the lid 183a of the first supply cup 171 opens. The lid 183b of the second supply cup 172 opens on the right side of the transfer path R1. The position indicated by reference sign D2 is a second open position (open position on the other side in the machine width direction) where the lid 183 of the second supply cup 172 opens.

Moreover, the 1st open position D1 and the 2nd open position D2 are seedling drop positions which are the positions which drop and supply a seedling to the planting tool 64. FIG. That is, the seedling supply device 38 has a seedling dropping position, which is a position where the seedling is dropped and supplied to the planting tool 64 in the midway portion in the front-rear direction of the transfer path R1.
The first opening position D1 and the second opening position D2 are set at different positions in the front-rear direction K1. In the present embodiment, the second opening position D2 is displaced backward with respect to the first opening position D1. Corresponding to the second open position D2 being displaced backward relative to the first open position D1, the right planting device in each transplant unit is displaced backward relative to the left planting device. ing.

As shown in FIG. 47, the seedling supply device 38 includes a setting member 185 that sets the opening positions of the supply cups 171 and 172 (can set the first opening position D1 and the second opening position D2). The setting member 185 includes a plurality of restriction rods (first restriction rod 186a to fourth restriction rod 186d).
The first restriction rod 186a contacts the lower surfaces of the lids 183a and 183b on the front side of the first opening position D1 and the second opening position D2. Accordingly, the first restriction rod 186a restricts the opening of the lids 183a and 183b on the front side of the first opening position D1 and the second opening position D2. The second restriction rod 186b contacts the lower surfaces of the lids 183a and 183b on the rear side of the first opening position D1 and the second opening position D2. Therefore, the second restriction rod 186b restricts the opening of the lids 183a and 183b on the rear side of the first opening position D1 and the second opening position D2.

  The third restriction rod 186c is located on the left side of the first opening position D1, and contacts the second engagement portion 184b of the lid 183b at the first opening position D1. This restricts the opening of the lid 183b at the first opening position D1. Further, the lid 183a is allowed to open at the first opening position D1. The fourth restriction rod 186d is located on the left side of the second opening position D2, and abuts on the first engagement portion 184a of the lid 183a at the second opening position D2. This restricts the opening of the lid 183a at the second opening position D2. Further, the lid 183b is allowed to open at the second open position D2.

  As shown in FIG. 48, the planting tool 64 is located below the first opening position D1, and when the lid 183a is opened and the seedling N1 falls, the planting tool 64 is transferred to the planting tool 64 via the intermediate hopper 126. N1 is supplied. In addition, the planting tool 64 is located below the second opening position D2, and when the lid 183b is opened and the seedling N1 falls, the seedling N1 is supplied to the planting tool 64 through the intermediate hopper 126. .

As shown in FIG. 44, the work machine 1 includes a plurality of chairs 187A to 187F (for the worker U1 to sit) for the worker U1 who works on the transplanter 3. The plurality of chairs includes a plurality of front chairs (first front chair 187A, second front chair 187B) and a plurality of side chairs (first side chair 187C to fourth side chair 187F).
The first front chair 187A is disposed in front of the first seedling supply device 38A, and the second front chair 187B is disposed in front of the second seedling supply device 38B. The first side chair 187C is disposed on the left side of the first seedling supply device 38A, and the second side chair 187D is disposed on the right side of the second seedling supply device 38B. The third side chair 187E is disposed on the left side of the rear portion of the third seedling supply device 38C, and the fourth side chair 187F is disposed on the right side of the rear portion of the third seedling supply device 38C.

  The worker U1 sitting on the first front chair 187A and the worker U1 sitting on the first side chair 187C supply seedlings to the supply cups 171 and 172 of the first seedling supply device 38A. The worker U1 sitting on the second front chair 187B and the worker U1 sitting on the second side chair 187D supply seedlings to the supply cups 171 and 172 of the second seedling supply device 38B. The worker U1 sitting on the third side chair 187E and the worker U1 sitting on the fourth side chair 187F supply seedlings to the supply cups 171 and 172 of the third seedling supply device 38C.

  As shown in FIG. 45, a seedling supply base 188 is provided in front of the first front chair 187A and the second front chair 187B (worker U1). Similarly, a seedling supply stand is also provided in front of each of the first side chair 187C to the fourth side chair 187F. The seedling supply stand 188 can place a seedling tray having a large number of seedlings. The worker U1 can supply seedlings to the supply cups 171 and 172 from the seedling tray placed on the seedling supply base 188.

As shown in FIG. 44 and FIG. 45, a seedling placing table 190 on which a seedling tray 189 can be placed is provided above the third seedling supply device 38C. A plurality of seedling trays 189 (in this embodiment, four seedling trays 189) can be placed on the seedling mount 190.
The worker U1 can supply seedlings from the seedling tray 189 on the seedling mount 190 to the supply cups 171 and 172. Since the seedling stage 190 is provided above the third seedling supply device 38C, that is, above the central seedling supply device, the first front chair 187A, the second front chair 187B, An operator U1 seated on each of the first side chair 187C to the fourth side chair 187F can take seedlings from the seedling tray 189 on the seedling table 190. That is, the seedling stage 190 is disposed at a position where the worker U1 seated on each chair can take seedlings from the seedling tray 189 on the seedling stage 190.

  The worker U1 can supply the seedlings on the seedling tray 189 on the seedling placing stand 190 to the supply cups 171 and 172 when the seedlings on the seedling tray 190 on the seedling supply stand 188 are exhausted. That is, the seedling stage 190 is a stage on which a spare seedling tray is placed. In addition, when there are no seedlings on the seedling tray on the seedling supply stand 188, the empty seedling tray may be replaced with a seedling tray on the seedling placing stand 190. Further, the seedling placing stand 190 may be a common seedling feeding stand for each worker without providing the seedling feeding stand 188 positioned in front of each worker U1.

In addition, a container (not shown) such as a container that can store a replenishing seedling tray is provided on the side of the front portion of the rotary cultivator 2, and an empty seedling tray on the seedling supply stand 188 or the seedling placing stand 190 is accommodated. The seedling in the container can be exchanged with a seedling tray in which the seedling is accommodated. This seedling tray replacement is performed by the worker U1 seated on the first front chair 187A and the second front chair 187B.
The third seedling supply device 38 </ b> C is formed to be longer rearward than the first seedling supply device 38 </ b> A and the second seedling supply device, and the rear portion protrudes rearward from the seedling mount 190. The operator U1 seated on the third side chair 187E and the fourth side chair 187F can supply seedlings to the supply cups 171 and 172 located in a portion protruding rearward from the seedling mount 190. In other words, the seedling placing stand 190 is provided from the front part of the third seedling supply device 38C to the middle part in the front-rear direction K1. Further, the front portion of the seedling mount 190 protrudes forward from the third seedling supply device 38C. Further, the seedling placing stand 190 protrudes rightward and leftward from the third seedling supply device 38C. As described above, the seedling mount 190 covers the upper part of the third seedling supply device 38C from the front part to the middle part.

  When planting is started, seedlings must be contained in the supply cups 171 and 172 located at the first opening position D1 and the second opening position D2. If the seedling stage 190 is provided above the third seedling supply unit 38C, it is considered that seedlings cannot be put into the supply cups 171 and 172 located below the seedling stage 190. Therefore, as shown in FIGS. 44 and 49, the seedling stage 190 is formed with an opening 191 through which seedlings can be supplied to the supply cups 171 and 172. The opening 191 is formed along the transfer path R1. Specifically, the opening 191 is formed along a portion of the transfer path R1 corresponding to the lower part of the seedling table 190, and is formed in an open U shape rearward in plan view. The worker U1 can put seedlings into the supply cups 171 and 172 located below the seedling stage 190 through the opening 191 before starting the planting work. After feeding the seedlings, a seedling tray 189 having seedlings is placed on the seedling placing stand 190.

  As shown in FIG. 49, the seedling mount 190 includes a front frame portion 190a, a rear frame portion 190b, a first side frame portion 190c that connects the left ends of the front frame portion 190a and the rear frame portion 190b, and a front frame. It has a rectangular frame portion formed by a second side frame portion 190d that connects the right ends of the portion 190a and the rear frame portion 190b. Further, a bottom plate 190e on which a seedling tray 189 is placed and an opening 191 is formed is provided at the lower end of the frame portion. The bottom plate 190e is made of, for example, punching metal.

  As shown in FIGS. 45 and 46, a plurality of front struts (first front strut 190f, second front strut 190g) are provided at the front portion of the seedling mount 190. In addition, a plurality of rear struts (first rear strut 190h and second rear strut 190i) are provided at the rear portion of the seedling mount 190. The first front support 190 f is provided on the left side of the seedling table 190 and is fixed on the tool bar 43. The second front strut 190 g is provided on the right side of the seedling mount 190 and is fixed on the tool bar 43. The first rear support 190h is provided on the left side of the seedling table 190 and is fixed to the apparatus frame 176. The second rear support 190 i is provided on the right side of the seedling mount 190 and is fixed to the apparatus frame 176.

As shown in FIGS. 2 and 3, the work machine 1 includes an attachment body 196 attached to the rotary tiller 2 and a seat frame 197 connected to the attachment body 196 so as to be movable up and down.
The attachment body 196 includes a first side frame member 196A, a second side frame member 196B, and a connection frame member 196C. The first side frame member 196 </ b> A is disposed on the left side of the lower portion of the rotary tiller 2 and is attached to the rotary tiller 2. The second side frame member 196 </ b> B is disposed on the right side of the lower portion of the rotary tiller 2 and is attached to the rotary tiller 2. The first side frame member 196 </ b> A and the second side frame member 196 </ b> B extend rearward from the front end portion of the rotary tiller 2. The rear portions of the first side frame member 196 </ b> A and the second side frame member 196 </ b> B protrude rearward from the rotary tiller 2 and are located on the front side of the transplanter 3. The connecting frame member 196C is disposed on the rear side of the rear support frame 13R along the machine width direction K2, and connects the first side frame member 196A and the second side frame member 196B.

As shown in FIG. 3, the first front chair 187 </ b> A is supported by the connecting frame member 196 </ b> C via the seat support member 198. The second front chair 187B is also supported by the connecting frame member 196C via the seat support member 198.
As shown in FIGS. 50 and 51, the seat frame 197 is a frame to which a chair is attached. Specifically, the first side chair 187C to the fourth side chair 187F are attached to the seat frame 197.

The seat frame 197 includes a frame main body 199, a frame connection mechanism 200, and a plurality of wheels (first wheel 206A to fifth wheel 206E).
A plurality of chairs are attached to the frame body 199. The frame main body 199 includes a first frame portion 201 disposed on the left side (one side) of the transplanter 3, a second frame portion 202 disposed on the right side (the other side) of the transplanter 3, The first frame unit 201 and the third frame unit 203 that connect the rear portions of the second frame unit 202 are provided. The first frame part 201 and the second frame part 202 are formed of a square pipe material. The first frame portion 201 is disposed so as to extend in the front-rear direction behind the first side frame member 196A. The second frame portion 202 is disposed so as to extend in the front-rear direction behind the second side frame member 196B.

  The third frame portion 203 is disposed 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 members (first member 203A, second member 203B, and third member 203C). The left end of the second 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 part of the second frame part 202. The third member 203C connects the first member 203A and the second member 203B. The position of the third member 203C can be adjusted in the machine width direction K2.

  As shown in FIGS. 50 and 51, the first side chair 187C is attached to the first frame portion 201 via the seat support member 204A. The first side chair 187C is attached to the seat support member 204A so that its position can be adjusted in the machine width direction K2. A second side chair 187D is attached to the second frame portion 202 via a seat support member 204B. The second side chair 187D is attached to the seat support member 204B so that its position can be adjusted in the machine width direction K2.

  A third side chair 187E is attached to the left part of the third member 203C of the third frame portion 203 via a seat support member 204C. The third side chair 187E is attached to the seat support member 204C so that its position can be adjusted in the front-rear direction K1. A fourth side chair 187F is attached to the right part of the third member 203C via a seat support member 204D. The fourth side chair 187F is attached to the seat support member 204D so that its position can be adjusted in the front-rear direction K1.

  The frame coupling mechanism 200 is a mechanism that couples the frame main body 199 to the attachment body 196 so as to be movable up and down. The frame coupling mechanism 200 includes a first mechanism 200A and a second mechanism 200B. The first mechanism 200A connects the first frame portion 201 to the first side frame member 196A. The second mechanism 200B connects the second frame portion 202 to the second side frame member 196B. The first mechanism 200A and the second mechanism 200B are configured by a parallel link mechanism.

Since the first mechanism 200A and the second mechanism 200B have the same structure, the structure of the first mechanism 200A will be described in detail, and the detailed description of the second mechanism 200B will be omitted.
As shown in FIGS. 52 and 53, the first mechanism 200A is connected to two front plates 207A and 207B, two rear plates 208A and 208B, front plates 207A and 207B, and rear plates 208A and 208B. Two links 209A and 209B.

  The front plate 207A is fixed to the side surface on the outer side in the machine width of the rear end portion of the first side frame member 196A, and the front plate 207B is the side surface on the inner side in the machine width of the rear end portion of the first side frame member 196A. It is fixed to. The rear plate 208A is fixed to the side surface on the machine width outward side of the front end portion of the first frame portion 201, and the rear plate 208B is fixed to the side surface on the machine width inner side of the front end portion of the first frame portion 201. Yes. The front part of the link 209A is rotatably supported between the front plates 207A and 207B around the axis in the machine width direction K2, and the rear part is provided between the rear plates 208A and 208B around the axis in the machine width direction K2. It is pivotally supported. The link 209B is disposed below the link 209A, the front part is pivotally supported between the front plates 207A and 207B so as to be rotatable around the axis in the machine width direction K2, and the rear part is provided between the rear plates 208A and 208B. It is pivotally supported around an axis in the width direction K2.

Similarly to the first mechanism 200A, the second mechanism 200B includes front plates 207A and 207B, rear plates 208A and 208B, and links 209A and 209B.
The frame main body 199 can be moved up and down in parallel by the first mechanism 200A and the second mechanism 200B.
The plurality of wheels (first wheel 206 </ b> A to fifth wheel 206 </ b> E) are constituted by, for example, tires, and are grounded to support the frame body 199. Therefore, the seat frame 197 moves up and down following the unevenness of the field with respect to the rotary tiller 2 and the transplanter 3.

As shown in FIGS. 50 and 51, the first wheel 206A is attached to the rear portion of the first frame portion 201 via a wheel support member 210A. The first wheel 206A is attached to the wheel support member 210A so that the height can be adjusted.
The second wheel 206B is attached to the rear portion of the second frame portion 202 via a wheel support member 210B. The second wheel 206B is attached to the wheel support member 210B so that the height can be adjusted.

The third wheel 206C is attached to the middle part (center part) of the third frame part 203 via a wheel support member 210C. The third wheel 206C is attached to the wheel support member 210C so that the height can be adjusted. The third wheel 206C is provided between the third side chair 187E and the fourth side chair 187F.
The fourth wheel 206D is attached to the front portion of the first frame portion 201 via a wheel support member 210D. The fourth wheel 206D is attached to the wheel support member 21DC so that the height can be adjusted. The fourth wheel 206D is provided in front of the first side chair 187C.

The fifth wheel 206E is attached to the front portion of the second frame portion 202 via a wheel support member 210E. The fifth wheel 206E is attached to the wheel support member 210E so that the height can be adjusted. The fifth wheel 206E is provided in front of the second side chair 187D.
As illustrated in FIGS. 50 and 51, the work machine 1 includes a lifting mechanism 211 that lifts the seat frame 197. The lifting mechanism 211 includes a swing member 213, a swing actuator 214, and a link member 215. The attachment body 196 includes a support frame 212 to which the lifting mechanism 211 is attached.

  As shown in FIGS. 54 and 55, the support frame 212 includes an arm member 212A and a vertical member 212B. The arm member 212A has a front portion connected to the connecting frame member 196C and protrudes rearward from the connecting frame member 196C. An attachment plate 216 is fixed to the lower surface of the front portion of the arm member 212A, and this attachment plate 216 is attached to the connection frame member 196C by a fixture 217 having a U bolt. In the vertical member 212B, a midway portion in the vertical direction is fixed to the rear end of the arm member 212A.

The swing member 213 has a front portion pivotally supported on an upper portion of the vertical member 212B so as to be rotatable about an axis in the machine width direction K2, and can swing up and down. Therefore, the swing member 213 is attached to the attachment body 196 so as to be swingable up and down.
The swing actuator 214 is an electric cylinder in this embodiment. The swing actuator 214 may be a hydraulic cylinder or an electric hydraulic cylinder.

The bottom side of the cylinder body 214a of the swing actuator 214 is pivotally supported by a stay 218a fixed to the lower portion of the vertical member 212B so as to be rotatable about the axis in the machine width direction K2. The piston rod 214b of the swing actuator 214 is pivotally supported by a stay 218b fixed to the front portion of the swing member 213 so as to be rotatable about an axis in the machine width direction K2. By moving the piston rod 214b back and forth, the swing member 213 swings up and down. That is, the swing actuator 214 is attached to the attachment body 196 and swings the swing member 213 up and down. The link member 215 is provided across the swing member 213 and the seat frame 197. Specifically, the upper portion of the link member 215 is pivotally supported at the rear portion of the swing member 213 so as to be rotatable about the axis in the machine width direction K2, and is projected downward from the rear portion of the swing member 213. ing. In addition, a long hole 220 that is long in the longitudinal direction is formed in the lower portion of the link member 215. An engagement pin 221 provided on a stay 219 fixed to the third frame portion 203 is inserted into the long hole 220.

  In the lifting mechanism 211, when the seat frame 197 moves up and down during work, the engagement pin 221 moves in the elongated hole 220 as shown in FIG. 55, so that the seat frame 197 moves up and down. Is acceptable. Further, when the work implement 1 is loaded onto a truck or the like, or lowered from the truck or the like, as shown in FIG. 56, the piston rod 214b of the swing actuator 214 is advanced from the cylinder body 214a (the swing actuator 214 is extended). By doing so, the link member 215 moves up independently of the rotary tiller 2 and the transplanter 3. When the link member 215 moves upward, the engagement pin 221 contacts the lower end of the long hole 220. With the engagement pin 221 in contact with the lower end of the long hole 220, the link member 215 is further moved upward, whereby the seat frame 197 can be lifted (lifted). Therefore, the link member 215 allows the seat frame 197 to move up and down at the time of work, and lifts (raises) the seat frame 197 by moving up independently of the transplanter 3.

Next, other embodiments and modifications will be described.
57 to 61 show a ground work apparatus 1B according to another embodiment.
Even in this embodiment, the ground working device 1B includes a rotary cultivator 2 and a transplanter 3, and the rotary cultivator 2 is mounted on the tractor 1A so as to be movable up and down. It is mounted so that it can be raised and lowered.

  As shown in FIGS. 57 and 58, a left cultivator (ridger) 226L and a right cultivator (ridger) 226R are provided at the rear portion of the rotary tiller 2. Therefore, this ground working device 1B is a working machine that forms one ridge by forming grooves in the soil cultivated with the rotary cultivator 2 with the soil cultivator 226L and the soil cultivator 226R. The upper surface of the bag is formed by the rear cover 19B. Two or more squares may be formed.

The transplanter 3 has two transplant units, a first transplant unit 36A and a second transplant unit 36B. The first transplantation unit 36A and the second transplantation unit 36B are configured in the same manner as the embodiment according to FIGS. One transplant unit may be provided, or three or more transplant units may be provided.
The work machine 1 has a plurality of chairs on which a worker U1 who works on the ground work device 1B (the transplanter 3) sits. 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 187G, second rear chair 187H). The first front chair 187A is provided in front of the first transplant unit 36A, and the second front chair 187B is provided in front of the second transplant unit 36B. The first back chair 187G is provided behind the first transplant unit 36A, and the second back chair 187H is provided behind the second transplant unit 36B.

  In other words, in the transplanter 2 having the first seedling supply device 38A and the second seedling supply device 38B provided 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 supply device 38B. The first rear chair 187G is provided behind the first seedling supply device 38A, and the second rear chair 187H is provided behind the second seedling supply device 38B.

In addition, when there is one transplant unit, one front chair and one rear chair are provided. That is, at least one front chair is provided and at least one rear chair is provided.
By providing a chair on which the worker U1 sits before and after the seedling supply device 38, the width of the work machine 1 (ground work apparatus 1B) in the machine width direction K2 can be reduced (narrowed), and movement between fields can be performed. It becomes easy and transportation during truck transportation becomes easy (advantageous). Moreover, since the 1st open position D1 (seedling drop position) and the 2nd open position D2 (seedling drop position) are located in the middle part in the front-back direction of the transfer path R1 of the supply cups 171 and 172, that is, the position where the seedling is dropped. Therefore, the operation of supplying seedlings to the supply cups 171 and 172 is facilitated. Further, since the work of the previous worker U1 and the subsequent worker U1 is unified, the replacement of the worker U1 is facilitated.

  As shown in FIG. 57, the first front chair 187A and the second front chair 187B are attached to a connecting frame member 196C of the attachment body 196 via a seat support member 198. As shown in FIGS. 57 and 58, the first rear chair 187G and the second rear chair 187H are attached to the frame body 199 of the seat frame 197. Specifically, the first rear chair 187G is attached to the third frame portion 203 via the seat support member 227A. The second rear chair 187H is attached to the third frame portion 203 via a seat support member 227B.

  Compared to the above-described embodiment, the first frame portion 201 and the second frame portion 202 of the frame main body 199 have a short front-rear length, and the first mechanism 200A and the second mechanism 200B of the frame coupling mechanism 200 are long in the front-rear direction. Is formed. The frame main body 199 is disposed behind the seedling supply device 38. Further, similarly to the above-described embodiment, the frame main body 199 is formed long in the machine width direction K2. A first wheel 296A is provided at one side (left side) of the machine width direction K2 in the frame body 199, and a second wheel 206B is provided at the other side (right side) of the machine width direction K2 of the frame body 199. ing. The third wheel 206C is provided in a midway portion (central portion) in the machine width direction K2 of the frame main body 199. In other words, the third wheel 206C is disposed between the first rear chair 187G and the second rear chair 187H.

  In this other embodiment, the link member 215 is provided across the work implement coupling mechanism 41 and the seat frame 197. As shown in FIGS. 57 and 59, in this embodiment, the link member 215 is provided across the tool bar 43 and the upper link 209A of the frame coupling mechanism 200. Moreover, in this embodiment, it has the multiple link member 215 (1st link member 215A, 2nd link member 215B).

One link member 215 may be provided. In other words, it is only necessary to have at least one link member 215. 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. 58, the first link member 215A is disposed inward in the machine width of the first side frame member 196A and the first mechanism 200A. The second link member 215B is disposed inside the machine width of the second side frame member 196B and the second mechanism 200B.

  As shown in FIGS. 58 to 60, the front end portion (upper end portion) of the first link member 215A is arranged around the axis in the machine width direction K2 via the pivot 229A on the bracket member 228A fixed to the rear surface of the tool bar 43. It is pivotally supported. The upper part (front part) of the second link member 215B is pivotally supported by a bracket member 228B fixed to the rear surface of the tool bar 43 via a pivot 229B so as to be rotatable about the axis in the machine width direction K2.

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

  In other embodiments, when the seat frame 197 moves up and down during work, the engagement pin 221 moves in the elongated hole 220, thereby allowing the seat frame 197 to move up and down. Further, when the working machine 1 is loaded onto a truck or the like, or when the working machine 1 is unloaded from the truck or the like, as shown in the phantom line in FIG. 59 or FIG. The seat frame 197 is lifted by moving the link member 215 upward while the engaging pin 221 contacts the lower end of the elongated hole 220 and the engaging pin 221 contacts the lower end of the elongated hole 220. (Can be raised).

As described above, the link member 215 allows the seat frame 197 to move up and down during the operation, and when the transplanter 3 is lifted by the elevating drive device 42, the link member 215 moves up as the second ground work machine rises. The seat frame 197 can be pulled up.
Other configurations are the same as those of the working machine 1 according to the embodiment described in FIGS. 1 to 56.
62 to 73 show other examples of the planting depth automatic adjustment system.

62 and 63 show a detection mechanism 231 that detects the height of the machine casing 37 with respect to the ground.
The detection mechanism 231 includes a detection member 232 that moves up and down following the unevenness of the field, a cam 233 that rotates in conjunction with the vertical movement of the detection member 232, a first limit switch 234 that engages with the cam 233, and a second A limit switch 235 and a third limit switch 236 are provided.
In this embodiment, the detection member 231 is the cover rings 81L and 81R. The detection member 231 is attached to the rear portion of the support frame 237 supported by the machine frame 37 so as to be swingable up and down. The support frame 237 is provided with a cylindrical boss 238 having an axis in the machine width direction K2 at the front. The boss 238 is supported by a support rod 239 provided on the machine casing 37. The support rod 239 has an axial center extending in the machine width direction K2, and is fixed to a support plate 240 extending downward from the seventh frame member 65g. The boss 238 is fitted to the outside of the support rod 239 so as to be rotatable around the axis and movable in the machine width direction K2. As a result, the support frame 237 can swing up and down and the position can be adjusted in the machine width direction K2. As the support frame 237 swings up and down, the detection member 232 can move up and down. The boss 238 can be fixed to the support rod 239 by a fixing tool at an arbitrary position in the machine width direction K2.

  As shown in FIGS. 62, 65, and 66, the machine frame 37 is provided with a mounting plate 243. The mounting plate 243 is provided over the ninth frame member 65i and the thirteenth frame member 65m and protrudes leftward from the thirteenth frame member 65m. The mounting plate 243 includes a vertical wall 243a, an upper wall 243b extending rearward from the upper portion of the vertical wall 243a, and a lower wall 243c extending rearward from the lower portion of the vertical wall 243a.

  As shown in FIGS. 67, 68, and 69, a support member 244 is attached to the vertical wall 243a. The support member 244 includes a first member 245 and a second member 246. The first member 245 includes a mounting wall 245a fixed to the vertical wall 243a by a plurality of bolts 247, a first support wall 245b extending rearward from the left end of the mounting wall 245a, and a rearward from the right end of the mounting wall 245a. And a second support wall 245c extending in the direction. The bolt insertion hole formed in the vertical wall 243a is formed long in the machine width direction K2. Therefore, the position of the first member 245 (support member 244) can be adjusted in the machine width direction K2. The second member 246 is provided across the first support wall 245b and the second support wall 245c. The second member 246 is supported by the first support wall 245b and the second support wall 245c so as to be rotatable about the axis in the machine width direction K2. The second member 246 has a mounting surface 246a formed on a flat surface at the rear and a contact surface 246b formed on the flat surface at the top. The second member 246 has an insertion hole 246c penetrating in the vertical direction.

As shown in FIG. 67, the support member 244 supports a movable member 248 that moves up and down as the detection member 232 moves up and down. The movable member 248 includes a rod member 242 and an engagement member 249. The rod member 242 is inserted through the insertion hole 246c of the second member 246 so as to be movable in the vertical direction.
As shown in FIG. 64, the lower end portion of the rod member 242 is supported by an attachment stay 241 provided at the rear portion of the support frame 237 so as to be rotatable about the axis in the machine width direction K2. Therefore, the rod member 242 moves up and down as the detection member 232 moves up and down.

The engaging member 249 moves up and down together with the rod member 242, thereby engaging the arm portion 233b to swing an arm portion 233b described later around the cam support shaft 255.
As shown in FIGS. 67 and 68, the engagement member 249 includes a cylindrical member 251 and an engagement shaft 252. The cylindrical member 251 is fitted to the rod member 242 so as to be movable in the vertical direction. Further, the cylindrical member 252 is attached to the rod member 242 with a fixing screw 250. Therefore, the cylindrical member 252 can be adjusted in the vertical position with respect to the rod member 242 by loosening the fixing screw 250. The engagement shaft 252 is provided on the cylindrical member 251 so as to protrude radially outward (rightward).

  As shown in FIGS. 67 and 68, an attachment member 253 is attached to the support member 244. The attachment member 253 includes a cam attachment portion 253a, a first switch attachment portion 253b, a second switch attachment portion 253c, a third switch attachment portion 253d, and an attachment wall portion 253e. The first switch mounting portion 253b extends upward from the cam mounting portion 253a. The second switch mounting portion 253c extends downward from the cam mounting portion 253a. The third switch mounting portion 253d extends rearward from the cam mounting portion 253a. The mounting wall portion 253e extends leftward from the lower portion of the second switch mounting portion 253c.

  A support cylinder 254 is fixed to the right surface of the cam mounting portion 253a, and a cam support shaft 255 fixed to the cam 233 is supported by the support cylinder 254 so as to be rotatable about the axis in the machine width direction K2. A first limit switch 234 is attached to the first switch attachment portion 253b, a second limit switch 235 is attached to the second switch attachment portion 253c, and a third limit switch 236 is attached to the third switch attachment portion 253d. Is attached. The cam 233, the first switch mounting portion 253b, the second limit switch 235, and the third switch mounting portion 253d are disposed on the same side (left side) of the mounting member 253 in the machine width direction K2. The attachment wall portion 253e is attached to the attachment surface 246a of the second member 246 with a bolt or the like.

The cam 233 includes a cam main body 233a that is rotatably supported by the cam mounting portion 253a by a cam support shaft 255, and an arm 233b that rotates integrally with the cam main body 233a.
The cam main body 233a is formed in a disc shape centered on the cam support shaft 255, and a first pressing portion 233c, a second pressing portion 233d, and a third pressing portion 233e that protrude outward in the radial direction are formed on the outer peripheral portion. Have.
The first pressing part 233 c is a part that presses the first limit switch 234. Specifically, the first pressing part 233c is a part that presses the contact 234a of the first limit switch 234. The second pressing part 233d is a part that presses the second limit switch 235. Specifically, the second pressing portion 233d is a portion that presses the contact 235a of the second limit switch 235. The third pressure part 233e is a part that presses the third limit switch 236. Specifically, the third pressing portion 233e is a portion that presses the contact 236a of the third limit switch 236.

The arm portion 233b protrudes forward from the cam body portion 233a and is located on the side (right side) of the cylindrical member 251. The arm portion 233b has an engagement hole 233f formed in the longitudinal direction. An engagement shaft 252 is inserted through the engagement hole 233f.
In the detection mechanism 231, the state shown in FIG. 67 is a neutral state. At this time, the first limit switch 234, the second limit switch 235, and the third limit switch 236 are not pressed by the cam 233. That is, the first limit switch 234, the second limit switch 235, and the third limit switch 236 are in the OFF state.

  When the detection member 232 moves up from this neutral state, the rod member 242 moves up in conjunction with this. Then, as shown in FIG. 71, the cylindrical member 251 moves upward together with the rod member 242, the engagement shaft 252 pushes up the arm portion, and the cam 233 rotates in the arrow a1 direction (one direction). When the cam 233 rotates in one direction a1, the first pressing portion 233c presses the first limit switch 234. As a result, the first limit switch 234 is turned on to detect the upward movement of the detection member 232.

  In addition, when the detection member 232 moves downward from the neutral state of FIG. 67, the rod member 242 moves downward. Then, as shown in FIG. 72, the cylindrical member 251 moves downward together with the rod member 242, the engagement shaft 252 pulls down the arm portion, and the cam 233 rotates in the arrow a2 direction (the other direction opposite to one direction). To do. When the cam 233 rotates in the other direction a2, the second pressing portion 233d presses the second limit switch 235. As a result, the second limit switch 235 is turned on to detect the downward movement of the detection member 232.

  Further, when the detection member 232 further moves down in the state where the second pressing portion 233d is pressing the second limit switch 235 (the state shown in FIG. 72), as shown in FIG. 73, the cylinder member 251 is moved down. The engagement shaft 252 pulls down the arm portion, and the cam 233 further rotates in the other direction a2. Then, the 3rd press part 233e presses the 3rd limit switch 236, and the 3rd limit switch 236 is turned ON. Therefore, the third limit switch 236 detects that the detection member 232 has further moved down in a state where the second pressing portion 233d is pressing the second limit switch 235. Accordingly, for example, when the machine frame 37 is raised when the work machine 1 is turned, a sudden rise (excessive rise) of the machine frame 37 is detected. At this time, the cylindrical member 251 contacts the contact surface 246b of the second member 246, and the downward movement of the detection member 232 is restricted.

  FIG. 70 shows the control device 26 (control circuit) that controls the elevating drive device 42. The control device 26 includes a first limit switch 234, a second limit switch 235, a third limit switch 236, a first relay 256, and a second relay 257. The first limit switch 234 and the second limit switch 235 are switches having a normally open contact, and the third limit switch 236 is a switch having a normally closed contact. The first relay 256 and the second relay 257 are normally open relays having a coil and a contact that closes when the coil is excited. The first limit switch 234 and the first relay 256 are connected in series, and the second limit switch 235, the third limit switch 236, and the second relay 257 are connected in series.

The automatic height adjustment of the machine frame 37 (automatic adjustment of the seedling planting depth) will be described with reference to FIGS. 17 and 70 to 73.
When the machine frame 37 is at the set ground height, the detection member 232 moves upward, the cam 233 rotates in one direction a1, and the first limit switch 234 is turned on, the contact of the first limit switch 234 is changed. The first relay 256 is excited and closed. When the first relay 256 is energized, the contact of the first relay 256 is closed, and an ascending command signal is sent to the first solenoid 71d of the elevating drive device 42 shown in FIG. In other words, when the contact of the first limit switch 234 is closed and the contact of the first relay 256 is closed, the first current e1 flows from the first relay 256 to the lifting drive device 42, and the first current from the first relay 256 is supplied. The first solenoid 71d is energized by e1. As a result, the electromagnetic valve 71 is switched from the neutral position 71a to the raised position 71b, the lifting cylinder C1 is contracted, and the machine casing 37 is raised. On the other hand, when the machine casing 37 rises, the cam 233 rotates in the other direction a2. When the machine frame 37 returns to the set ground height, the cam 233 returns to the neutral position, the first limit switch 234 is turned OFF, the electromagnetic valve 71 returns to the neutral position 71a, and the machine frame 37 stops.

  When the machine frame 37 is at the set ground height, the detection member 232 moves downward, the cam 233 rotates in the other direction a2, and the second limit switch 235 is turned on, the contact of the second limit switch 235 is changed. The second relay 257 is excited and closed. When the second relay 257 is excited, the contact of the second relay 257 is closed, and an ascending command signal is sent to the second solenoid 71e of the elevating drive device 42. In other words, when the contact of the second limit switch 235 is closed and the contact of the second relay 257 is closed, the second current e2 flows from the second relay 257 to the lifting drive device 42, and the second current from the second relay 257 is supplied. The second solenoid 71e is energized by e2. As a result, the electromagnetic valve 71 is switched from the neutral position 71a to the lowered position 71c, the elevating cylinder C1 is extended, and the machine casing 37 is raised. On the other hand, when the machine casing 37 moves up, the cam 233 rotates in one direction a1. When the machine frame 37 returns to the set ground height, the cam 233 returns to the neutral position, the second limit switch 235 is turned OFF, the electromagnetic valve 71 returns to the neutral position 71a, and the machine frame 37 stops.

By the above control, the machine frame 37 is automatically adjusted to the ground height set, and the seedling planting depth is automatically adjusted to the set depth.
Further, when the second limit switch 235 is turned on, the detection member 232 is further moved down to rotate the cam 233 in the other direction a2, and when the third limit switch 236 is turned on, the contact of the third limit switch 236 is changed. The second relay 257 is in a non-excited state. When the second relay 257 is in a non-excited state, transmission of the ascending command signal to the second solenoid 71e is stopped. In other words, the supply (energization) of the second current e2 to the elevating drive device 42 (second solenoid 71e) is stopped. Thereby, the solenoid valve 71 returns to the neutral position 71a, and the machine casing 37 stops.

  For example, when turning the working machine 1 on the headland, the ground working device 1B (the rotary tiller 2 and the transplanter 3) is lifted and turned. At this time, if the second limit switch remains ON, the machine casing 37 continues to descend. At this time, the contact of the third limit switch 236 opens, and the machine casing 37 stops. To do. That is, when the machine frame 37 is rapidly raised, such as during turning, the machine frame 37 does not continue to descend but stops.

  In the detection mechanism 231, the fixing screw 250 is loosened to move the cylinder member 251 up and down with respect to the rod member 242, and the fixing screw 250 is tightened and fixed at an arbitrary moving position, thereby fixing the machine frame. The set ground height of 37 can be changed. That is, when the cylinder member 251 is moved upward, the cam rotates in one direction a1, the first limit switch 234 is turned on, and the machine casing 37 is raised. Further, when the cylindrical member 251 is moved downward, the cam rotates in the other direction a2, the second limit switch 235 is turned on, and the machine casing 37 is lowered. Thereby, the set ground height of the machine casing 37 can be changed.

  When adjusting the position of the planting device in the machine width direction K2 and adjusting the spacing between the seedlings, the detection member 232, which is a cover ring, also adjusts the position in the machine width direction K2 corresponding to the position adjustment of the planting device. Must be adjusted. At this time, if the bolt 237 is loosened and the support member 244 is moved in the machine width direction K2 with respect to the mounting plate 243, the support member 244, the movable member 248 and the mounting member 253 are moved in the machine width direction together with the detection member 232. It is moved to K2, and the detection mechanism 231 can be easily adapted to the adjustment of the streak spacing.

FIG. 74 shows an example in which the assist device 151 is adopted for another type of planting device 39. The configuration other than the planting device 39 is configured in the same manner as in the above embodiment.
In the planting device 39 shown in FIG. 74, the planting lifting mechanism 261 that supports the planting tool 64 so as to be movable up and down is constituted by a link mechanism.
The planting elevating mechanism 261 includes a first swing link 262A and a second swing link 262B that are pivotally supported by a planting frame 260 fixed to the machine frame 37, and the first swing link 262A and the second swing link 262A. The swinging body 263 pivotally supported at the lower part of the moving link 262B, the third swinging link 264A and the fourth swinging link 264B, the front part of which is pivotally supported by the swinging body 263 and extending rearward and upward, the third swinging link 264B And a plate member 265 pivotally supported at the rear part of the swing link 264A and the fourth swing link 264B.

The attachment member 122 is attached to the plate member 265, and the planting tool 64 is attached to the attachment member 122 so that opening and closing is possible. The third swing link 264A is connected to the planting drive shaft 267 by a rotating arm 266.
When the planting drive shaft 267 rotates, the first swing link 262A and the second swing link 262B swing back and forth, and the third swing link 264A and the fourth swing link 264B swing up and down. Thus, the planting tool 64 moves up and down so as to draw a substantially elliptical locus A1.

The planting device 39 includes an opening / closing mechanism 268 that opens and closes the planting tool 64. The opening / closing mechanism 268 opens the planting tool 64 when the planting tool 64 descends to the bottom dead center position and enters the field, while the planting tool 64 rises from the bottom dead center position to the top dead center position. Close the planting tool 64.
A boss 159 at the tip of the movable rod 155 of the assist device 151 is pivotally supported by the plate member 265 via a support shaft 158. The holder 156 through which the base side of the movable rod 155 is inserted is rotatably attached to a holder bracket 160 fixed to the rocking body 263. Other configurations of the assist device 151 are the same as those of the assist device 151 shown in FIGS. 32 and 33.

  Even in the planting apparatus 39 shown in FIG. 74, the spring operating mechanism 153 is operated by the swinging operation of the planting lifting mechanism 261 (power for moving the planting tool 64 up and down) to assist springs (compression springs) 152. Stretch the. Specifically, the spring operating mechanism 153 compresses the assist spring 152 when the planting tool 64 descends and extends the assist spring 152 when the planting tool 64 ascends.

FIG. 75 shows the transplanter 3 in which the cutting time of power transmitted to the planting device 39 and the seedling supply device 38 is controlled by a plurality of electromagnetic clutches (the first clutch 269A and the second clutch 269B). . The transplanter 3 may be mounted on the rotary cultivator 2 mounted on the tractor 1A so as to be movable up and down, or may be mounted on the tractor 1A so as to be movable up and down directly.
As shown in FIG. 75, the transplanter 3 has a plurality of main shafts (first main shaft 270A, second main shaft 270B). The power from the power source 271 is wound around the first main shaft 270A through the winding transmission mechanism 272, the first input shaft 273A, and the first clutch 269A. The power of the power source 271 is transmitted to the second main shaft 270B via the winding transmission mechanism 272, the second input shaft 273B, and the second clutch 269B.

The power source 271 may be a prime mover (engine) of the tractor 1A, or an electric motor or the like equipped in the transplanter 3 or the like.
The transplanter 3 has a plurality of planting devices (39A1 to 39A3, 39B1 to 39B3) arranged in parallel in the machine width direction K2. In other words, the transplanter 3 (work machine 1) has a plurality of planting tools 64 arranged in parallel in the machine width direction K2. Moreover, the transplanter 3 has a plurality of seedling supply devices (38A1 to 38A3, 38B1 to 38B3) arranged in parallel in the machine width direction K2. The number of seedling supply devices 38 corresponding to each planting device 39 is provided.

The planting devices 39A1 to 39A3 are driven to move up and down when power is transmitted from the first main shaft 270A, and the seedling supply devices 38A1 to 38A3 are driven by power transmitted from the first main shaft 270A.
The planting devices 39B1 to 39B3 are driven to move up and down when power is transmitted from the second main shaft 270B, and the seedling supply devices 38B1 to 38B3 are driven by power transmitted from the second main shaft 270B.

As described above, the first clutch 269A intermittently transmits power transmitted to one of the adjacent planting tools 64 in the machine width direction K2, and the second clutch 269B The power transmitted to the other is interrupted.
The planting devices 39 (planting tools 64) may be arranged in a line in the machine width direction K2, or the planting devices 39 (planting tools 39) adjacent in the machine width direction K2 are arranged. It may be provided so as to be displaced in the front-rear direction K1.

Other configurations are the same as those in the above-described embodiment.
In the transplanter 3 shown in FIG. 75, all the planting tools 64 can be stopped at the top dead center position in the vertical movement range, so that the seedlings can be delivered stably at the top dead center position. Moreover, since the cutting | disconnection time of the power transmission to an adjacent planting tool can be set separately, the space | interval of the advancing direction of an adjacent planting strip can be adjusted arbitrarily. That is, the distance (interval) in the front-rear direction of adjacent seedlings in the machine width direction K2 can be freely changed. In addition, it is possible to change between stocks for each adjacent planting line.

FIG. 76 also shows the transplanter 3 in which the cutting time of the power transmitted to the planting device 39 and the seedling supply device 38 is controlled by a plurality of electromagnetic clutches as described above.
In the transplanter 3 shown in FIG. 76, the plurality of electromagnetic clutches include a plurality of first clutches (269A1 to 269A3) and a plurality of second clutches (269B1 to 269B3).
The power of the drive source 271 is transmitted to the main shaft 270 via the winding transmission mechanism 277. The power transmitted to the main shaft 270 is transmitted to the shaft 275A1 via the winding transmission mechanism 264A1, transmitted to the shaft 275A2 via the winding transmission mechanism 264A2, and transmitted to the shaft 275A3 via the winding transmission mechanism 264A3. The The power transmitted to the shaft 275A1 is transmitted to the shaft 275B1 via the winding transmission mechanism 274B1, and the power transmitted to the shaft 275A2 is transmitted to the shaft 275B2 via the winding transmission mechanism 274B2, and the shaft 275A3. The power transmitted to is transmitted to the shaft 275B3 via the winding transmission mechanism 274B3.

  The power transmitted to the shaft 275A1 is transmitted to the drive shaft 276A1 via the first clutch 269A1 so as to be intermittent, and the power transmitted to the shaft 275A2 is transmitted to the drive shaft 276A2 via the first clutch 269A2. The power transmitted to the shaft 275A3 is transmitted to the drive shaft 276A3 via the first clutch 269A3 so as to be intermittent. Power is transmitted from the drive shaft 276A1 to the seedling supply device 38A1 and the planting device 39A1, power is transmitted from the drive shaft 276A2 to the seedling supply device 38A2 and the planting device 39A2, and the seedling supply device 38A3 and the planting device are transmitted from the drive shaft 276A3. Power is transmitted to 39A3.

  Further, the power transmitted to the shaft 275B1 can be intermittently transmitted to the drive shaft 276B1 via the second clutch 269B1, and the power transmitted to the shaft 275B2 can be intermittently connected to the drive shaft 276B2 via the second clutch 269B2. The power transmitted to the shaft 275B3 is transmitted to the drive shaft 276B3 via the second clutch 269B3 in an intermittent manner. Power is transmitted from the drive shaft 276B1 to the seedling supply device 38B1 and the planting device 39B1, power is transmitted from the drive shaft 276B2 to the seedling supply device 38B2 and the planting device 39B2, and the seedling supply device 38B3 and the planting device are transmitted from the drive shaft 276B3. Power is transmitted to 39B3.

Other configurations are the same as those in the above-described embodiment.
FIG. 77 is a block diagram showing a control system of the electromagnetic clutch 24 and a power transmission system of the transplanter 3 according to another embodiment.
In this embodiment, the transplanter 3 (the seedling supply devices 38A to 38C and the planting tool 64) is driven by the power of the electric motor 278. Therefore, the electric motor 278 is a drive motor that generates power for moving the planting tool 64 up and down and operating the seedling supply devices 38A to 38C. The electric motor 278 is attached to the machine frame 37 of the transplanter 3, for example. The electric motor 278 is connected to, for example, the battery B1 of the tractor 1A, and power is supplied from the battery B1.

The rotational power of the electric motor 278 is transmitted to the electromagnetic clutch 24 via a power transmission device 280A having gears, sprockets and the like, and the power is transmitted from the electromagnetic clutch 24 to the worm 30 in an intermittent manner. The power transmitted to the worm 30 is transmitted to the transplanter 3 via a power transmission device 280B having gears, sprockets and the like.
The electric motor 278 is connected to the control device 26, and the control device 26 controls the rotation speed. The control device 26 is connected to the battery B1 of the tractor 1A, for example, and is supplied with power from the battery B1. The control device 26 is connected to a detection sensor 279 that detects the vehicle speed or the movement amount of the tractor 1A. As the detection sensor 279, for example, a vehicle speed sensor mounted on the tractor 1A or a distance sensor (rotation sensor) that measures the travel distance of the tractor 1A can be employed. The control device 26 controls the rotation speed of the electric motor (drive motor) 278 in conjunction with the vehicle speed or the movement amount detected by the detection sensor 279. Thereby, operation | movement of the planting tool 64 can be linked with a vehicle speed.

  In addition, an inter-stock setting device 27 is connected to the control device 26. The inter-strain setting device 27 is the same as that in the above-described embodiment. Moreover, the control apparatus 26 has the stock setting part 26a and the speed control part 26d. The stock setting unit 26a acquires signals from the detection sensor 279 and the stock setting device 27, and based on the set value between stocks set by the stock setting device 27 and the movement amount of the work machine 1 obtained by the detection sensor 279. The disconnection time of the electromagnetic clutch 24 is set. Thereby, it can plant between the stock | stumps which set the seedling.

  When the vehicle speed is a speed that exceeds the drive limit of the lifting speed of the planting tool 64, the speed regulating unit 26d controls the lifting speed to a predetermined speed that is equal to or lower than the driving limit. Alternatively, the speed regulating unit 26d stops the planting tool 64 when the vehicle speed becomes a speed that exceeds the drive limit of the lifting speed of the planting tool 64. In order to stop the operation of the planting tool 64, for example, the electromagnetic clutch 24 is disconnected. Thereby, breakage of the planting apparatus 39 can be prevented.

  In the embodiment of FIG. 77, the electric motor 278 may be intermittently operated in order to obtain a set stock. That is, the electric motor 278 may be stopped, and the seedling stock planted may be set according to the stop time. Therefore, in this case, the inter-strain setting unit 26a sets the inter-strain of seedlings to be planted by setting the cutting time of the electric motor (drive motor) 278. In this case, the electromagnetic clutch 30 may not be provided.

  As shown in FIG. 77, in the case where the transplanter 3 is driven by the electric motor 278, if a large number of planting units 36 are provided, the power may be insufficient. In this case, as shown in FIG. 78, by configuring the drive motor with a hydraulic motor 281, a large power can be obtained and the planting units 36 can be increased in number. In the case where the power transmitted from the tractor 1A to the rotary tiller 2 is branched and transmitted to the transplanter 3, the rotational speed of the rotary shaft 16 of the rotary tiller 2 is adjusted in accordance with the planting speed. However, the rotation speed of the rotary shaft 16 can be determined regardless of the planting speed by driving the transplanter 3 with a drive motor.

  The embodiment shown in FIG. 78 includes, for example, a flow rate adjustment valve 284 that controls the rotation speed of the hydraulic motor 281. The flow rate adjustment valve 284 is connected to the control device 26, and the control device 26 controls the flow rate adjustment valve 284 in conjunction with the vehicle speed or the movement amount detected by the detection sensor 279, and controls the hydraulic pressure supplied to the hydraulic motor 281. Adjust the flow rate. By adjusting the flow rate of the hydraulic pressure supplied to the hydraulic motor 281, the rotational speed of the hydraulic motor 281 is controlled in conjunction with the vehicle speed or movement amount of the tractor 1 </ b> A.

  The hydraulic pressure is supplied to the flow rate adjustment valve 284 by, for example, a hydraulic pressure supply source 283 that is a hydraulic pump provided in addition to the tractor 1A. This hydraulic pump is driven by the power of the drive source 282. As the drive source 282 for driving the hydraulic pump, a power take-off shaft (PTO shaft) 22, a prime mover (engine) E1, an electric motor, or the like can be considered. Further, the supply of hydraulic pressure to the flow rate adjusting valve 284 may be performed by a hydraulic pressure take-out portion (hydraulic supply source 283) provided in the tractor 1A. In this case, the oil pressure taken out from the oil pressure take-out part is the oil pressure generated by the hydraulic pump installed in the tractor 1A.

Further, the hydraulic supply source 283 may be an auxiliary control valve provided in the tractor 1A. In this case, the flow rate adjustment valve 284 is not necessary, the number of rotations of the hydraulic motor 281 is controlled by the auxiliary control valve, and the auxiliary control valve is controlled by the control device 26.
Even in the embodiment shown in FIG. 78, seedlings may be planted between the established strains by intermittently driving the drive motor 285 without providing the electromagnetic clutch 24.

The other configuration of the embodiment shown in FIG. 78 is the same as that of the embodiment shown in FIG.
79 shows an embodiment in which the transplanter 3 is driven by a hydrostatic continuously variable transmission (HST) 284 instead of the hydraulic motor 281 in the embodiment of FIG.
The HST 284 includes an HST pump 284a and an HST motor 284b. The HST pump 284a is driven by the power of the drive motor 285. The drive motor 285 is configured by a hydraulic motor or an electric motor. When the drive motor 285 is a hydraulic motor, for example, the hydraulic pressure is supplied from the flow rate adjustment valve 284 or the auxiliary control valve 283 and is driven to rotate. When the drive motor 285 is an electric motor, the electric motor is connected to the battery B1, for example, electric power is supplied from the battery B1, and the electric motor is rotationally driven.

  The HST pump 284a is constituted by, for example, a swash plate type variable displacement pump, and is connected to the HST motor 284b in a closed circuit by a pair of speed change oil passages. The HST motor 284b is driven and rotated by the oil discharged from the HST pump 284a. The rotational power of the HST motor 284b is transmitted to the electromagnetic clutch 24 via the power transmission device 280A, and the power is transmitted from the electromagnetic clutch 24 to the worm 30 in an intermittent manner.

  The embodiment shown in FIG. 79 has an actuator 286 that controls the rotation of the HST pump 284a. The actuator 286 is connected to the control device 26 and the HST 284 (HST pump 284a). The control device 26 controls the actuator 286 in conjunction with the vehicle speed or movement amount detected by the detection sensor 279, and controls the swash plate of the HST pump 284a by the actuator 286. By controlling the swash plate of the HST pump 284a, the rotation speed of the HST pump 284b is controlled in conjunction with the vehicle speed or the movement amount of the tractor 1A.

In the present embodiment, the actuator 286 is electrically connected to the HST pump 284a, and the actuator 286 rotates the HST pump 284a by electronic control. Note that the swash plate of the HST pump 284a may be changed directly by the actuator 286.
Even in the embodiment shown in FIG. 79, seedlings may be planted between the established strains by intermittently driving the drive motor 285 without providing the electromagnetic clutch 24.

The other configuration of the embodiment shown in FIG. 79 is the same as that of the embodiment shown in FIG.
FIG. 80 is a block diagram showing a manual adjustment function between stocks.
As shown in FIG. 80, the work machine 1 includes an inter-strain adjustment switch 288 that performs fine adjustment operations between the set stocks. The stock adjustment switch 288 is a switch that can be manually operated in two different directions (arrow b1 direction (one direction) and arrow b2 direction (other direction)) from the reference position shown in FIG. The stock adjustment switch 288 is configured by a rotary switch, for example. The stock adjustment switch 288 is connected to the control device 26, and the control device 26 acquires a signal from the stock adjustment switch 288.

The inter-strain adjustment switch 288 has a linear instruction portion 288a on the outer peripheral portion. Around the stock adjustment switch 288, a plurality of scales (first scale 289a to fifth scale 289e) indicated by the instruction unit 288a are formed.
The first scale 289a is a scale at which the instruction unit 288a matches at the reference position of the inter-stock adjustment switch 288. The first scale 289a is a scale that is adjusted when working on a flat ground (horizontal farm).

The second scale 289b is adjacent to the first scale 289a in one direction b1. The third scale 298c is adjacent to the second scale 289b in one direction b1. The second scale 289b and the third scale 298c are scales for aligning the instruction unit 288a when working on a downward slope (when working while going down a slope).
The fourth scale 289d is a scale adjacent to the first scale 289a in the other direction b2. The fifth scale 289e is adjacent to the fourth scale 289d in the other direction b2. The fourth scale 289d and the fifth scale 289e are scales for aligning the instruction unit 288a when working on an uphill slope (when working while climbing up a slope).

  The control unit 26 is connected to a stock setting device 27 and is connected to a display unit 290 that displays stocks set by the stock setting device 27. A pulse sensor 25 is connected to the control device 26. The inter-strain setting device 27 and the pulse sensor 25 are as described in the above embodiment. Moreover, the control apparatus 26 has the stock setting part 26a similarly to the said one Embodiment.

  When the indicator 288a of the inter-strain adjustment switch 288 is set to the first scale 289a, the inter-strain setting unit 26a controls the electromagnetic clutch 24, and seedlings are planted between the strains set by the inter-strain setting unit 27. Specifically, the control device 26 counts the number of pulses transmitted by the pulse sensor 25 from the point of time when the electromagnetic clutch 24 is disconnected, and when the counted number of pulses reaches the number of pulses set by the stock setting unit 27, the electromagnetic clutch 24 Send a signal to connect. The stock setting unit 27 sets and changes the number of pulses, so that the stock setting unit 26a sets and changes the disconnection time of the electromagnetic clutch 24. Thereby, the setting and change between stocks can be performed.

The control device 26 includes a correcting unit (referred to as a first correcting unit) 26e that corrects the actual stocks so as to match the set stocks based on the operation of the stock adjustment switch 288.
When working on a downward slope, since the work implement 1 is pulled in the traveling direction, the slip rate tends to be small, and the actual stock distance tends to be long. When working with this downward inclination, for example, the indicator 288a is adjusted to the second scale 289b when the inclination is small, and is adjusted to the third scale 289c when the inclination is larger than the inclination.

  The adjustment between the stocks will be specifically described. When the instruction unit 288a is set to the second scale 289b, for example, the first correction unit 26e subtracts one pulse from the number of pulses set by the stock setting unit 27, and this subtraction. When the number of pulses reached is reached, the electromagnetic clutch 24 is connected. In addition, when the instruction unit 288a is set to the third scale 289c, for example, the first correction unit 26e subtracts two pulses from the number of pulses set by the stock setting unit 27, and when this number of subtracted pulses is reached, electromagnetic The clutch 24 is connected.

  As described above, when the stock adjustment switch 288 is set to the second scale 289b or the third scale 289c, the disconnection time of the electromagnetic clutch 24 is shorter than the disconnection time set by the stock setting unit 27. In other words, the first correction unit 26e makes the disconnection time of the electromagnetic clutch 24 shorter than the disconnection time set by the stock setting unit 26a according to the operation amount when the stock adjustment switch 288 is operated in one direction b1. . Thereby, in the planting operation in the downward slope, the seedling can be planted between the set strains or can be planted between the strains close to the set strains.

In addition, when working on an upward slope, the work implement 1 is pulled in the direction opposite to the traveling direction, so that the slip ratio increases and the actual stock distance tends to be shortened. At the time of the work with the upward inclination, the instruction unit 288a is adjusted to the fourth scale 289d when the inclination is small, and to the fifth scale 289e when the inclination is large.
Specifically, when the instruction unit 288a is aligned with the fourth scale 289d, for example, the first correction unit 26e adds one pulse from the number of pulses set by the stock setting unit 27, and adds this number of pulses. When reaching, the electromagnetic clutch 24 is connected. In addition, when the instruction unit 288a is set to the fifth scale 289e, for example, the first correction unit 26e adds two pulses from the number of pulses set by the inter-sector setting device 27, and when this added number of pulses is reached, electromagnetic The clutch 24 is connected.

  As described above, when the inter-stock adjustment switch 288 is set to the fourth scale 289d or the fifth scale 289e, the disconnection time of the electromagnetic clutch 24 becomes longer than the disconnection time set by the inter-organization setting device 27. In other words, the 1st correction | amendment part 26e makes the cutting time of the electromagnetic clutch 24 longer than the cutting time set by the stock setting part 26a according to the operation amount at the time of operating the stock adjustment switch 288 to the other direction b2. . Thereby, in the planting operation in the upward slope, the seedling can be planted between the set strains or can be planted between the strains close to the set strains.

In addition, adjustment between stocks can be performed without changing the stock displayed on the display unit 290.
Moreover, you may perform control of the cutting time of the electromagnetic clutch 24 by the 1st correction | amendment part 26e by a slip ratio so that it may demonstrate below.
When working on a downward slope, the slip rate tends to be smaller than the slip rate on flat ground, and the actual stock distance tends to be longer. In addition, when working on an uphill slope, the slip rate tends to be greater than the slip rate on flat ground, and the actual stock distance tends to be shorter. Therefore, when the slip ratio decreases, the disconnection time of the electromagnetic clutch 24 is shortened, and when the slip ratio increases, the disconnection time of the electromagnetic clutch 24 is lengthened, so that the actual stocks match between the stocks when working on the slope. Or approached.

  The control device 26 stores a disconnection time of the electromagnetic clutch 24 corresponding to the slip ratio. Specifically, the cutting time of the electromagnetic clutch 24 calculated in consideration of the slip ratio at the time of work on the sloping ground, and the cutting time such that the actual stock spacing becomes the stock spacing set by the stock spacing setter 27 on the sloping ground is stored. Has been. For example, it corresponds to the disconnection time (first disconnection time) of the electromagnetic clutch 24 corresponding to the slip rate at the time of the downward inclination and the small inclination, and the slip ratio at the time of the downward inclination and the large inclination. Disengagement time (second disengagement time) of the electromagnetic clutch 24, disengagement time (third disengagement time) of the electromagnetic clutch 24 corresponding to the slip ratio when the work is in an upward inclination and a small inclination, and the operation is in an upward inclination And the disconnection time (fourth disconnection time) of the electromagnetic clutch 24 corresponding to the slip ratio at the time of a large inclination is stored.

  When the stock adjustment switch 288 is set to the second scale 289b, the first correction unit 26e controls the electromagnetic clutch 24 at the first disconnection time, and when the stock adjustment switch 288 is set to the third scale 289c, the first correction unit 26e. Controls the electromagnetic clutch 24 in the second disconnection time. Further, when the inter-stock adjustment switch 288 is set to the fourth scale 289d, the first correction unit 26e controls the electromagnetic clutch 24 at the third disconnection time, and when the inter-stock adjustment switch 288 is set to the third scale 289c, the first correction The unit 26e controls the electromagnetic clutch 24 with the fourth disconnection time.

FIG. 81 is a block diagram showing an automatic adjustment function between stocks.
As illustrated in FIG. 81, the work machine 1 includes an angle sensor 291 that detects an inclination angle and an inclination direction of the work machine 1 with respect to the horizontal (for example, a forward inclination angle of the work machine 1). The angle sensor 291 is connected to the control device 26. The control device 26 acquires the detection value of the angle sensor 291 (inclination angle and inclination direction of the work machine 1).

  The control device 26 includes a correction unit (referred to as a second correction unit) 26f that corrects the actual stocks so as to match the set stocks based on the detection value of the angle sensor 291. The second correction unit 26f is configured to set the disconnection time of the electromagnetic clutch 24 by the stock setting unit 27 according to the inclination angle of the work machine 1 detected by the angle sensor 291 (automatically) in the downward inclination operation. In the work in the upward inclination, which is shorter than the time, the disconnection time of the electromagnetic clutch 24 is set to the disconnection time set by the stock setting unit 27 according to the inclination angle of the work machine 1 detected by the angle sensor 291 (automatically). Longer than.

  For example, when the work implement 1 has a small inclination in the work in the downward inclination, the second correction unit 26f subtracts one pulse from the pulse number set by the inter-sector setting device 27, and reaches the subtracted pulse number. Then, the electromagnetic clutch 24 is connected. Further, when the work implement 1 has a large inclination in the work in the downward inclination, the second correction unit 26f subtracts two pulses from the number of pulses set by the inter-sector setting device 27, and reaches the number of subtracted pulses. Then, the electromagnetic clutch 24 is connected.

  In addition, when the work implement 1 has a small inclination in the uphill work, the second correction unit 26f adds one pulse from the number of pulses set by the stock setting unit 27, and reaches this added number of pulses. Then, the electromagnetic clutch 24 is connected. In addition, when the work implement 1 has a large inclination in the work in the upward inclination, the second correction unit 26f adds two pulses from the number of pulses set by the stock setting unit 27, and reaches the added number of pulses. Then, the electromagnetic clutch 24 is connected.

Further, the control of the disconnection time of the electromagnetic clutch 24 by the second correction unit 26f may be automatically performed according to the slip ratio.
That is, when the work implement 1 has a small inclination in the work in the downward inclination, the second correction unit 26f controls the electromagnetic clutch 24 in the first disconnection time, and the work equipment 1 is large in the work in the downward inclination. When the vehicle is inclined, the second correction unit 26f controls the electromagnetic clutch 24 with the second disconnection time.

In addition, when the work implement 1 is in a small inclination in the work in the upward inclination, the second correction unit 26f controls the electromagnetic clutch 24 in the third disconnection time, and the work equipment 1 is large in the work in the upward inclination. When the vehicle is inclined, the electromagnetic clutch 24 is controlled with the fourth disconnection time.
In the embodiment shown in FIG. 81, a changeover switch 292 connected to the control device 26 is provided. The changeover switch 292 is a switch for turning on and off the automatic adjustment function between stocks by the second correction unit 26f. In other words, the changeover switch 292 controls the disconnection time of the electromagnetic clutch 24 based on the detection result of the angle sensor 291 and does not control the disconnection time of the electromagnetic clutch 24 based on the detection result of the angle sensor 291. This switch selectively switches between cases. Thereby, when it is unnecessary, the automatic adjustment function between stocks can be avoided.

The work machine 1 of the present embodiment has the effects described below.
The work machine 1 is moved up and down by the power of the drive source (engine E1), holds the seedling, descends, enters the field and plantes the seedling, and energizes the planting tool 64 in the direction of raising. The compression spring 152 that operates, and the power that moves the planting tool 64 up and down, compresses the compression spring 152 when the planting tool 64 descends and expands the compression spring 152 when the planting tool 64 ascends An operation mechanism 153.

  According to this configuration, the compression spring 152 is compressed when the planting tool 64 is lowered, so that a force that acts as a resistance to free fall can be sufficiently applied to the planting tool 64. Further, the compression spring 152 extends when the planting tool 64 is lifted, so that the lifting force can be sufficiently applied to the planting tool 64. Thereby, the raising / lowering operation | movement of the planting tool 64 can be performed favorably.

  The spring actuating mechanism 153 includes a movable rod 155 that reciprocates in the axial direction along with the operation of the planting tool 64 reciprocating up and down, and a holder 156 that supports the movable rod 155 so as to be movable in the axial direction. And a restricting tool 157 that is attached to the movable rod 155 so as to be integrally movable. The compression spring 152 is interposed between the restricting tool 157 and the holder 156, and restricts when the planting tool 64 descends. The tool 157 is compressed by moving in the direction approaching the holder 156 and is compressed by moving the restricting tool 157 away from the holder 156 when the planting tool 64 is raised.

According to this configuration, the compression spring 152 can be stably operated.
The spring operating mechanism 153 includes a rotating member 154 that rotates once while the planting tool 64 reciprocates up and down, and one end of the movable rod 155 is pivoted to a portion that is deviated from the rotation center of the rotating member 154. The regulating tool 157 is supported and attached between one end of the movable rod 155 and the holder 156.

According to this configuration, the spring operating mechanism 153 can be configured with a simple structure.
Further, the restricting tool 157 is attached so that its position can be changed in the axial direction of the movable rod 155.
According to this configuration, the urging force of the compression spring 152 can be easily changed.
Moreover, the adjustment part 166 which adjusts the relationship between the position of the planting tool 64 and the expansion-contraction state of the compression spring 152 is provided.

According to this configuration, the switching position between compression and extension of the compression spring 152 with respect to the position of the planting tool 64 can be adjusted.
Moreover, the planting raising / lowering mechanism 139 which supports the planting tool 64 so that raising / lowering is possible, and the power transmission mechanism 105 which transmits the motive power of a drive source to the planting raising / lowering mechanism 139 are provided. It has rotating shafts 111A to 111C driven around the shaft center by power, and the planting tool 64 reciprocates up and down one time and the compression spring 152 expands and contracts by one rotation around the shaft center of the rotating shafts 111A to 111C. The portion 166 includes a first transmission member 167 that rotates integrally with the rotation shafts 111A to 111C, and a second transmission member that is connected to the first transmission member 167 and rotates integrally therewith and transmits power to the planting lifting mechanism 139 (drive sprocket). 116 </ b> R), and the second transmission member whose rotational positions around the axis of the rotation shafts 111 </ b> A to 111 </ b> C can be adjusted with respect to the first transmission member 167.

According to this structure, the structure which adjusts the relationship between the position of the planting tool 64 and the expansion-contraction state of the compression spring 152 can be comprised easily.
In addition, a planting lift mechanism 139 configured by a link mechanism that supports the planting tool 64 so as to be movable up and down is provided. Let

According to this structure, in the planting apparatus provided with the planting raising / lowering mechanism 139 comprised by the link mechanism which supports the planting tool 64 so that raising / lowering is possible, the raising / lowering operation | movement of the planting tool 64 can be performed favorably. .
The work implement 1 includes a detection member 232 that moves up and down following the unevenness of the field, and a cam 233 that rotates in conjunction with the vertical movement of the detection member 232, and includes a first pressing portion 233c and a second pressing portion. A cam 233 having 233d, a first limit switch 234 that is pressed by the first pressing portion 233c when the cam 233 rotates in one direction, and detects the upward movement of the detection member 232, and when the cam 233 rotates in the other direction. A second limit switch 235 that is pressed by the second pressing portion 233d to detect the downward movement of the detection member 232.

According to this configuration, the structure of the mechanism that detects the vertical movement of the detection member 232 can be simplified.
In addition, since the detection member 232 is moved up and down by the cam 233 and the limit switch, the position adjustment of the detection member 232 in the body width direction can be easily handled without causing a complicated structure.

  The second limit switch 235 is a limit switch that detects the downward movement of the detection member 232. When the cam 233 rotates in the other direction, the second pressing portion 233d In a state where the second limit switch 235 is being pressed, a third pressing portion 233e that presses the third limit switch 236 to further detect that the detection member 232 has moved downward is provided.

According to this configuration, the rapid downward movement of the detection member 232 can be detected by the third limit switch 236.
A movable member 248 that moves up and down as the detection member 232 moves up and down is provided. The cam 233 is a cam main body 233a that can rotate about a cam support shaft 255 that supports the cam 233, and has a first pressing force. A cam body portion 233a having a portion 233c, a second pressing portion 233d, and a third pressing portion 233e, and an arm portion 233b that rotates integrally with the cam body portion 233a. The arm portion 233b engages with the movable member 248. As the movable member 248 moves up and down, it swings around the cam support shaft 255.

According to this configuration, it is possible to easily configure a mechanism for detecting the vertical movement of the detection member 232 using the cam 233 and the limit switch.
The movable member 248 moves up and down as the detection member 232 moves up and down, and moves up and down together with the rod member 242 so that the arm 233 b swings around the cam support shaft 255. The engagement member 249 is attached to the rod member 242 so that the position of the engagement member 249 can be adjusted in the vertical direction.

According to this configuration, the relative position between the cam 233 and the limit switch can be adjusted, whereby the detection position of the detection member 232 in the same vertical position can be adjusted.
Also, a machine frame 37 that can be raised and lowered, a planting tool 64 that is supported by the machine frame 37 so as to be able to move up and down, and enters a farm field when it descends, and a first pressing portion 233c is a first limit switch. When the second press part 233d presses the second limit switch 235, the machine case 37 is controlled to be lowered, and the third press part 233e controls the third limit switch 236. And a control device 26 that stops the lowering of the machine casing 37 when pressed.

  According to this structure, it can adjust automatically so that the planting depth of a seedling may be kept constant. Further, when the machine frame 37 is suddenly raised when turning the work machine 1 or the like, the detection member 232 moves away downward relative to the machine frame 37, but the detection member 232 is relatively lowered. By continuing detection by the second limit switch 235, the machine casing 37 can be prevented from continuing to descend.

  A support frame 212 to which the detection member 232 is attached, the support frame 212 being attached to the machine frame 37 so as to be vertically swingable and capable of adjusting the position in the machine width direction K2 which is the width direction of the machine frame 37; The first limit switch 234, the second limit switch 235, the third limit switch 236 and the cam 233 are attached to the mounting member 253, and the machine frame 37 is attached to the machine frame 37 so that the position can be adjusted in the machine width direction K2. The movable member 248 is attached to the support frame 212 and supported by the support member 244 so as to move up and down.

According to this configuration, when the position of the detection member 232 is adjusted in the machine width direction K2, the first limit switch 234, the second limit switch 235, the third limit switch 236, the cam 233, the mounting member 253, and the support frame 212 are provided. The support member 244 can be moved integrally in the machine width direction K2.
Further, the control device 26 includes an elevating drive device 42 that elevates and drives the machine frame 37. The control device 26 is connected to the first limit switch 234, and the contact is closed when the first limit switch 234 is pressed by the first pressing portion 233c. A first relay 256; a second relay 257 that is connected to the second limit switch 235 and closes when the second limit switch 235 is pressed by the second pressing portion 233d; and the first relay 256 The lifting / lowering drive device 42 is activated to raise the machine frame 37 by the first current e1 from the second current e2, and the lifting / lowering drive device 42 is activated to lower the machine frame 37 by the second current e2 from the second relay 257. When the 3 limit switch 236 is pressed by the third pressing portion 233e, the contact of the second relay 257 is opened to move the lift drive device 42. To stop the supply of the second current e2 of.

According to this configuration, the cam 233, the limit switch, and the relay can be used to control the lifting / lowering of the machine casing 37 without using a microcomputer, and the lifting / lowering system of the machine casing 37 can be configured at low cost.
Further, the elevating drive device 42 is a device having an electric actuator or an electrohydraulic actuator, or is driven by a hydraulic valve 71 that switches the direction of hydraulic oil under the control of the control device 26 and hydraulic oil from the electromagnetic valve 71. And a device having a hydraulic actuator C1 that moves the machine casing 37 up and down.

Further, the work machine 1 includes a traveling body 1A and a rotary cultivator 2 that is mounted on the rear portion of the traveling body 1A so as to be able to move up and down, and the machine frame 37 is mounted on the rotary cultivator 2 so as to be movable up and down. Also good.
The work machine 1 is mounted on the traveling body 1A, the traveling body 1A having the traveling apparatus 7, the prime mover E1 that drives the traveling apparatus 7, and the power take-out shaft 22 that extracts the power of the prime mover E1, A first ground working machine (rotary tiller 2) to which power is transmitted from the take-out shaft 22 and a second ground working machine (transplanter 3) mounted on the first ground working machine, from the power take-out shaft 22 A second ground working machine having at least one planting tool 64 for entering a farm field and planting a seedling when moving up and down by the power transmitted via the first ground working machine, and transmitted to the planting tool 64 And at least one electromagnetic clutch 24, 291A, 291B capable of interrupting the power to be operated, and a control device 26 having an inter-strain setting unit that sets between the seedling plants to be planted by setting the disconnection time of the electromagnetic clutch. That.

  According to this configuration, the planting tool 64 is driven up and down by the power transmitted from the power take-out shaft 22 that extracts the power of the prime mover E1 of the traveling body 1A through the first ground work machine. The raising / lowering motion of the tool 64 can be interlocked with the vehicle speed. Thereby, even if a vehicle speed changes, it can plant between the stock | stump | stocks set by setting the cutting | disconnection time of the electromagnetic clutch which interrupts the motive power transmitted to the planting tool 64. FIG.

  The working machine 1 is a traveling body 1A, a first ground working machine mounted on the traveling body 1A, and a second ground working machine mounted on the first ground working machine. A second ground working machine having at least one planting tool 64 for planting seedlings by entering the field, a drive motor 278 for generating power to raise and lower the planting tool 64, and the planting tool 64 from the drive motor 278. At least one electromagnetic clutch 24 capable of intermittently transmitting transmitted power, a detection sensor 279 for detecting the vehicle speed or movement amount of the traveling body 1A, and a drive motor 278 in conjunction with the vehicle speed or movement amount detected by the detection sensor 279. And a control device 26 that controls the number of rotations, and the control device 26 has an inter-strain setting unit 26a that sets the interval between seedlings to be planted by setting the cutting time of the electromagnetic clutch 24.

According to this structure, the raising / lowering operation | movement of the planting tool 64 can be interlocked with a vehicle speed. Thereby, even if a vehicle speed changes, it can plant between the stocks set by setting the cutting time of electromagnetic clutch 24 which interrupts the power transmitted to planting tool 64.
The working machine 1 is a traveling body 1A, a first ground working machine mounted on the traveling body 1A, and a second ground working machine mounted on the first ground working machine. The second ground working machine having at least one planting tool 64 for entering the field and planting seedlings, the drive motor 278 for generating power to move the planting tool 64 up and down, and the vehicle speed or moving amount of the traveling body 1A A detection sensor 279 for detecting, and a control device 26 for controlling the number of rotations of the drive motor 278 in conjunction with the vehicle speed or the movement amount detected by the detection sensor 279. The control device 26 has a stop time of the drive motor 278. The inter-strain setting unit 26a for setting the seedlings to be planted is set.

According to this structure, the raising / lowering operation | movement of the planting tool 64 can be interlocked with a vehicle speed. Thereby, even if a vehicle speed changes, it can plant between the stocks set by setting stop time of drive motor 278 which interrupts power transmitted to planting tool 64.
The working machine 1 is a traveling body 1A, a first ground working machine mounted on the traveling body 1A, and a second ground working machine mounted on the first ground working machine. A second ground working machine having at least one planting tool 64 for entering a farm and planting seedlings, a drive motor 278 for generating power, an HST pump 284a driven by the power of the drive motor 278, and an HST pump An HST motor 284b that is driven by the discharge oil of 284a to generate power for moving the planting tool 64 up and down, at least one electromagnetic clutch 24 capable of intermittently transmitting power transmitted from the HST motor 284b to the planting tool 64, and traveling A detection sensor 279 for detecting the vehicle speed or movement amount of the body 1A, and a swash plate of the HST pump 284a in conjunction with the vehicle speed or movement amount detected by the detection sensor 279 And a control device 26 that controls the number of rotations of the HST motor 284b by changing the control device 26. Have.

According to this structure, the raising / lowering operation | movement of the planting tool 64 can be interlocked with a vehicle speed. Thereby, even if a vehicle speed changes, it can plant between the stocks set by setting the cutting time of electromagnetic clutch 24 which interrupts the power transmitted to planting tool 64.
The working machine 1 is a traveling body 1A, a first ground working machine mounted on the traveling body 1A, and a second ground working machine mounted on the first ground working machine. A second ground working machine having at least one planting tool 64 for entering a farm and planting seedlings, a drive motor 278 for generating power, an HST pump 284a driven by the power of the drive motor 278, and an HST pump An HST motor 284b that is driven by the discharge oil of 284a to generate power to move the planting tool 64 up and down, a detection sensor 279 that detects the vehicle speed or movement amount of the traveling body 1A, and a vehicle speed or movement detected by the detection sensor 279. And a control device 26 that controls the rotation speed of the HST motor 284b by changing the swash plate of the HST pump 284a in conjunction with the amount. Having between strains setting unit 26a for setting the strains of planted seedlings by setting the stop time of the motor 278.

According to this structure, the raising / lowering operation | movement of the planting tool 64 can be interlocked with a vehicle speed. Thereby, even if a vehicle speed changes, it can plant between the stocks set by setting stop time of drive motor 278 which interrupts power transmitted to planting tool 64.
Moreover, the planting raising / lowering mechanism 139 which supports the planting tool 64 so that raising / lowering is possible, and the worm | warm 30 which transmits the motive power from the electromagnetic clutch 24 to the planting raising / lowering mechanism 139 are provided.

According to this configuration, the self-locking function of the worm 30 can prevent the occurrence of the shackle of the planting tool 64 (the planting tool 64 stops and reverses before the stop position (top dead center position)). it can.
Moreover, the planting raising / lowering mechanism 139 which supports the planting tool 64 so that raising / lowering is possible, and the worm | warm 30 which transmits the motive power from the drive motor 278 to the planting raising / lowering mechanism 139 are provided.

According to this configuration, it is possible to prevent occurrence of shackle of the planting tool 64 by the self-locking function of the worm 30.
Further, the electromagnetic clutch 24 and the worm 30 may be provided in the first ground working machine, and the planting lifting mechanism 139 may be provided in the second ground working machine.
Further, at least one torque limiter (first torque limiter 33, second torque limiter 109A to fourth torque limiter 109C) provided in a power transmission path from the worm 30 to the planting lifting mechanism 139 is provided.

According to this configuration, when an overload is applied to the planting lifting mechanism 139, power transmission to the planting lifting mechanism 139 is cut by the torque limiter, and the planting lifting mechanism 139 can be prevented from being damaged.
Further, when the vehicle speed becomes a speed that exceeds the drive limit of the lifting speed of the planting tool 64, the control device 26 controls the lifting speed to a predetermined speed that is equal to or lower than the driving limit, or stops the planting tool 64. A speed regulating unit 26d is included.

According to this configuration, it is possible to protect the planting lift mechanism 139 that lifts the planting tool 64.
In addition, the work machine 1 includes a plurality of planting tools 64 arranged in parallel in the machine width direction K2, which is the width direction of the work machine 1, and a plurality of electromagnetic clutches. At least one first clutch 269A that interrupts the power transmitted to one of the adjacent planting tools 64 in the direction K2, and less than the power that is transmitted to the other of the adjacent planting tools 64. Also includes one second clutch 269B.

  According to this configuration, all the planting tools 64 can be stopped at the top dead center position in the vertical movement range, so that the seedling can be delivered stably at the top dead center position. Moreover, since the cutting | disconnection time of the power transmission to the adjacent planting tool 64 can be set separately, the space | interval of the advancing direction of an adjacent planting strip can be adjusted arbitrarily. That is, the distance (interval) in the front-rear direction of adjacent seedlings in the machine width direction K2 can be freely changed. In addition, it is possible to change between stocks for each adjacent planting line.

  In addition, the work machine 1 includes a stock adjustment switch 288 that can be operated in two different directions, and the control device 26 selects one of the two directions b1 according to the amount of operation when the stock adjustment switch 288 is operated. A first correction unit 26e that shortens the cutting time set by the inter-browth setting unit 26a when operated and lengthens the cutting time set by the inter-bowl setting unit 26a when operated in the other direction b2 of the two directions. Have.

According to this configuration, for example, in a planting operation on an inclined land, it is possible to match between established stocks between seedlings, or it is possible to plant seedlings between strains close to the established strains.
In addition, the work machine 1 includes an angle sensor 291 that detects an inclination angle and an inclination direction of the work machine 1 with respect to the horizontal, and the control device 26 performs a downward inclination according to the inclination angle detected by the angle sensor 291. There is a second correction unit 26f that shortens the cutting time set by the inter-stock setting unit 26a at the time of work and lengthens the cutting time set by the inter-stock setting unit 26a at the time of work on the uphill.

According to this configuration, for example, in a planting operation on an inclined land, it is possible to match between established stocks between seedlings, or it is possible to plant seedlings between strains close to the established strains.
Moreover, the changeover switch 292 which turns on / off the automatic stock adjustment function by the 2nd correction | amendment part 26f is provided.

According to this configuration, it is possible not to use the automatic stock adjustment function when unnecessary.
Further, the drive motor 278 may be configured by an electric motor or a hydraulic motor.
In addition, the work machine 1 includes a traveling body 1A that travels in a farm field, a first ground work machine that is attached to the rear part of the traveling body 1A, and a machine frame 37 that is attached to the rear part of the first ground work machine so as to be movable up and down. , A planting tool 64 that is supported by the machine frame 37 so as to be movable up and down and enters the field when planting, and a covering ring 81L that rolls the field and covers the seedling planted by the planting tool 64 , 81R and a second ground work machine having a height detection mechanism 93 for detecting the ground height of the machine frame 37, and a height so that the ground height of the machine frame 37 becomes a preset ground height. And a control device 26 that controls the lifting and lowering of the machine frame 37 with respect to the first ground work machine based on the detection result of the height detection mechanism 93.

According to this configuration, the height detection mechanism 93 and the control device 26 can control the ground height of the second ground work machine independently of the first ground work machine. Thereby, control of the ground height of a 2nd ground work machine can be performed accurately.
The height detection mechanism 93 includes a detection member 94 that moves up and down following the unevenness of the field, a first connection link 95 that connects the detection member 94 to the machine frame 37 so as to be movable up and down, and a first connection link 95. And a first angle sensor 73 for detecting the rotation angle.

According to this configuration, the ground height of the second ground work machine can be easily detected.
In addition, the second connection link 101 that connects the machine frame 37 to the first ground work machine so as to be movable up and down, the second angle sensor 74 that detects the rotation angle of the second connection link 101, and the lift that drives the machine frame 37 up and down. A drive device 42, and the control device 26 includes a height setting unit that sets a set ground height determined from the rotation angle of the first connection link 95 and the rotation angle of the second connection link 101, A height control unit 26c that controls the elevation drive device 42 to control the height of the machine frame 37 to the set ground height based on the rotation angle of the first connection link 95 detected by the angle sensor 73 is provided.

According to this configuration, the setting ground height can be easily set.
Moreover, the detection member 94 may be comprised by the covering soil rings 81L and 81R.
Moreover, the 1st ground working machine may be the rotary tiller 2 with which the traveling body 1A was mounted | worn so that raising / lowering was possible.
In addition, the work machine 1 includes a first ground work machine attached to the rear part of the traveling body 1A, a second ground work machine attached to the rear part of the first ground work machine so as to be movable up and down, and a second ground work machine. A chair 187A to 187F on which a worker U1 who works is seated and a seat frame 197 to which the chairs 187A to 187F are attached, the seat frame 197 moving up and down with respect to the first ground work machine and the second ground work machine. The seat frame 197 is allowed to move up and down during work, and the seat frame 197 is lifted up independently of the second ground work machine or in conjunction with the rise of the second ground work machine. Link member 215 that can be used.

  According to this configuration, the seat frame 197 can be pulled up by the link member 215. Thereby, interference of the seat frame 197 when the working machine 1 is tilted can be prevented. Further, since the link member 215 allows the seat frame 197 to move up and down during work, the chairs 187A to 187F can be moved up and down following the unevenness of the field.

  Further, an attachment body 196 attached to the first ground work machine and connected to the seat frame 197 so as to be movable up and down, a swinging member 213 attached to the attachment body 196 so as to be swingable up and down, and an attachment body 196. And a swing actuator 214 that swings the swing member 213 up and down, and the link member 215 is provided across the swing member 213 and the seat frame 197.

According to this configuration, the seat frame 197 can be pulled up independently of the second ground work machine.
The link member 215 is provided across the seat frame 197 and a member that moves up and down together with the second ground work machine or the second ground work machine.
According to this configuration, the seat frame 197 can be pulled up in conjunction with the rise of the second ground work machine.

  Further, the link member 215 has a long hole 220, and the seat frame 197 has an engagement pin 221 through which the long hole 220 is inserted, and the engagement pin 221 moves in the long hole 220 during operation. The seat frame 197 is allowed to move up and down, and when the link member 215 moves up, the engagement pin 221 comes into contact with the lower end of the elongated hole 220 so that the seat frame 197 can be pulled up.

According to this configuration, the seat frame 197 can be allowed to move up and down during work with a simple configuration, and the seat frame 197 can be pulled up when the link member 215 moves up.
The seat frame 197 includes a frame main body 199 to which the chairs 187A to 187F are attached, a frame connecting mechanism 200 that connects the frame main body 199 to the attachment body 196, and a plurality of wheels (first wheels) that support the frame main body 199. 1 wheel 206A-5th wheel 206E).

According to this configuration, the seat frame 197 can be moved up and down following the unevenness of the field.
The frame main body 199 includes a first frame 201 disposed on one side of the second ground work machine, a second frame 202 disposed on the other side of the second ground work machine, and the first frame 201. The plurality of wheels support the rear side of the second frame 202 and the first wheel 206A that supports the rear side of the first frame 201. It includes a second wheel 206B and a third wheel 206C that supports a midway portion of the third frame 203.

According to this configuration, the seat frame 197 can be supported even if one wheel on one side is removed.
The second ground work machine includes a work machine connection mechanism 41 that connects the second ground work machine to the first ground work machine so that the second ground work machine can be lifted and lowered, and a lifting drive device 42 that drives the second ground work machine to move up and down. A machine frame 37 coupled to the work machine coupling mechanism 41 and moved up and down by the lift drive device 42; and a planting tool 64 that is supported by the machine frame 37 so as to be movable up and down and enters a farm field to plant seedlings when lowered. And a control device 26 for controlling the lift drive device 42 to move the machine frame 37 up and down following the unevenness of the field.

According to this structure, the planting precision of a seedling can be improved by raising / lowering a 2nd ground work machine with respect to a 1st ground work machine.
In addition, the work machine 1 includes a holding frame 66 that extends rearward from the work machine connection mechanism 41 and supports the rear portion of the second ground work machine.
According to this configuration, the rear portion of the second ground work machine can be supported, and vibration of the second ground work machine can be prevented.

  The work machine connection mechanism 41 includes a tool bar 43 to which the machine frame 37 is attached, and a connection link mechanism 44 that connects the tool bar 43 to the first ground work machine so that the machine tool 37 can be moved up and down. The holding frame 66 is connected to the tool bar 43 and extends rearward from the tool bar 43, and is provided at the rear part of the support lights 67L and 67R. And a holding rod 69 that supports the second ground work machine so as to be movable in the machine width direction K2.

According to this configuration, it is possible to reduce the labor for attaching the machine casing 37 to the toolbar 43 and reduce the error in the assembly height.
The working machine 1 is a traveling body 1A and a ground working device 1B mounted on the rear part of the traveling body 1A, and a loop in which a large number of supply cups 171 and 172 that store seedlings are extended in the front-rear direction K1. Grounding work apparatus 1B having a seedling supply device 38 for transferring along the transfer path R1 and a planting tool 64 provided below the seedling supply device 38 and for planting the seedling supplied from the seedling supply device 38 in the field. And a plurality of chairs on which a worker U1 who works on the ground work device 1B sits, and the plurality of chairs includes at least one front chair 187A, 187B provided in front of the seedling supply device 38, and a seedling And at least one rear chair 187G, 187H provided behind the supply device 38.

By providing chairs for the worker U1 to sit on the front and back of the seedling supply device 38, the width of the work machine 1 can be reduced, which is advantageous during movement and transportation.
In addition, the seedling supply device 38 has seedling dropping positions D1 and D2 that are positions where the seedling is dropped and supplied to the planting tool 64 in the middle of the front-rear direction K1 of the transfer path R1.
According to this configuration, since there is no position to drop the seedling in front of the eyes, it is easy to supply the seedling to the supply cups 171 and 172. Further, since the work of the previous worker U1 and the subsequent worker U1 is unified, the replacement of the worker U1 is facilitated.

Further, the ground work device 1B includes a first ground work machine attached to the rear part of the traveling body 1A and a second ground work machine attached to the rear part of the first ground work machine. May have a seedling supply device 38 and a planting tool 64, and the plurality of chairs may be chairs on which a worker U1 who works on the second ground work device 1B sits.
Also, a seat having an attachment body 196 attached to the first ground working machine, and a frame body 199 which is disposed behind the seedling supply device 38 and supports the rear chair and is connected to the attachment body 196 so as to be movable up and down. A frame 197 and a plurality of wheels (first wheel 296A to third wheel 296C) that support the frame main body 199 are provided.

According to this configuration, the seat frame 197 can be easily moved up and down following the unevenness of the field.
In the work machine 1, the frame body 199 is formed long in the machine width direction K <b> 2, which is the width direction of the work machine 1, and the plurality of wheels are provided on one side of the machine width direction K <b> 2 in the frame body 199. The first wheel 206A, the second wheel 206B provided on the other side of the frame body 199 in the machine width direction K2, and the third wheel 206C provided in the middle of the frame body 199 in the machine width direction K2. Including.

According to this configuration, the seat frame 197 can be supported even if one wheel on one side is removed.
The mounting body 196 is provided on the first side frame member 196A provided on one side of the machine width direction K2 of the first ground work machine and on the other side of the machine width direction K2 of the first ground work machine. The second side frame member 196B, and the connecting frame member 196C for connecting the first side frame member 196A and the second side frame member 196B, the seat frame 197 moves the frame main body 199 up and down on the mounting body 196. A frame connecting mechanism 200 that connects the frame main body 199 to one side of the machine width direction K2 of the seedling supply device 38, and one side portion of the frame body 199 in the machine width direction K2 The first mechanism 200A connected to the first side frame member 196A and the other side portion of the frame body 199 in the machine width direction K2 disposed on the other side of the machine width direction K2 of the seedling supply device 38 are connected to the second side frame. A second mechanism 200B coupled to the material 196B.

According to this configuration, the seat frame 197 can be provided without considering interference with the second ground work machine.
In addition, a work machine connection mechanism 41 that connects the second ground work machine to the first ground work machine so as to be lifted and lowered, a lifting drive device 42 that drives the second ground work machine to move up and down, and the work machine connection mechanism 41 or the second ground work machine. A work machine and a link member 215 provided across the seat frame 197. The link member 215 allows the seat frame 197 to move up and down during work, and the lift drive device 42 allows the second ground work machine to be moved. When lifting, the seat frame 197 is lifted up as the second ground work machine rises.

According to this configuration, the seat frame 197 can be lifted in conjunction with lifting the second ground work machine, which is convenient.
The work machine connection mechanism 41 includes a toolbar 43 to which the second ground work machine is attached, and a connection link mechanism 44 that connects the tool bar 43 to the first ground work machine so as to be movable up and down, and the link member 215 includes an upper part. Is pivotally supported by the tool bar 43 and has a long hole 220 at the bottom. The frame connecting mechanism 200 has an engagement pin 221 that passes through the long hole 220. , The seat frame 197 is allowed to move up and down, and when the second ground working machine is lifted by the lift drive device 42 and the link member 215 moves up, the engagement pin 221 moves the lower end of the elongated hole 220. The seat frame 197 can be pulled up by abutting against.

According to this configuration, the seat frame 197 can be allowed to move up and down during work with a simple configuration, and the seat frame 197 is pulled up when the link member 215 moves up together with the second ground work machine. be able to. Thereby, interference of the seat frame 197 when the working machine 1 is tilted can be prevented.
The seedling supply device 38 includes a first seedling supply device 38 and a second seedling supply device 38 arranged side by side in the machine width direction K2, and the plurality of chairs includes a plurality of front chairs (first front chair 187A, 2nd front chair 187B) and a plurality of back chairs (the 1st back chair 187G, the 2nd back chair 187H), and a plurality of front chairs are the 1st front chairs 187A provided ahead of the 1st seedling supply device 38. And a second front chair 187B provided in front of the second seedling supply device 38, and the plurality of rear chairs includes a first rear chair 187G provided in the rear of the first seedling supply device 38, and a second The 1st wheel 206C may be arranged between the 1st back chair 187G and the 2nd back chair 187H including the 2nd back chair 187H provided in the back of seedling supply device 38.

  In addition, the work machine 1 includes a seedling supply device 38 that transfers a large number of supply cups 171 and 172 that store seedlings along a loop-shaped transfer path R1, a seedling supply device 38 that is provided below the seedling supply device 38, and A planting tool 64 for planting seedlings supplied from the field, and a seedling mounting table 190 provided above the seedling supply device 38 and on which a seedling tray 189 storing seedlings can be placed. The stand 190 has an opening 191 through which seedlings can be supplied to the supply cups 171 and 172.

According to this configuration, by placing the seedling tray 189 on the seedling placing stand 190 provided above the seedling supply device 38, the operation of supplying seedlings to the supply cups 171 and 172 of the seedling supply device 38 is easy. It can be done.
Further, by providing the seedling stage 190 with an opening 191 through which seedlings can be supplied to the supply cups 171, 172, the supply cups 171, 172 before placing the seedling tray 189 on the seedling stage 190. The seedlings can be supplied to the supply cups 171, whereby the seedlings can be supplied in advance to the supply cups 171 and 172 before the planting operation is started.

Further, the transfer path R1 has a loop shape extending in the front-rear direction K1, and the rear part protrudes rearward from the seedling stage 190.
According to this configuration, even if the seedling placing stand 190 is provided above the seedling supply device 38, the seedling can be supplied to the supply cups 171 and 172 at the rear portion of the seedling supply device 38. In addition, a chair on which the worker U1 sits can be provided on the rear side of the seedling supply device 38. The opening 191 is formed along the shape of the portion of the transfer path R1 corresponding to the lower side of the seedling mount 190. Yes.

According to this configuration, the opening 191 can be formed to the minimum necessary size, and the placement portion of the seedling tray 189 can be widened.
Also, a seedling supply device 38 for transferring a large number of supply cups 171 and 172 containing seedlings along the loop-shaped transfer path R1, and a seedling provided below the seedling supply device 38 and supplied from the seedling supply device 38. A plurality of transplanting units (first transplanting unit 36A to third transplanting unit 36C) having a planting tool 64 for planting a plant in the field, and a seedling tray 189 provided above the seedling supply device 38 and containing seedlings Can be placed and a seedling stage 190 having an opening 191 capable of supplying seedlings to the supply cups 171 and 172, and a plurality of chairs on which the worker U1 sits, The worker U1 seated on each chair is disposed at a position where the seedling can be taken from the seedling tray 189 on the seedling mount 190.

According to this configuration, the worker U1 seated on each chair can take seedlings from the seedling tray 189 on the seedling mount 190.
The plurality of transplanting units include a first transplanting unit 36A located on one side of the machine width direction K2, which is the width direction of the working machine 1, and a second transplanting unit located on the other side of the machine width direction K2. 36B and a third transplanting unit unit 36C located between the first transplanting unit 36A and the second transplanting unit 36B in the machine width direction K2, and the seedling placing stand 190 is a seedling supply device for the third transplanting unit 36C. 38 is provided above.

According to this configuration, the worker U1 who supplies seedlings to the first transplanting unit 36A, the worker U1 who supplies seedlings to the second transplanting unit 36B, and the third transplanting unit 36C On the other hand, the seedling placing stand 190 can be provided at a position where the worker U1 who supplies seedlings can take seedlings.
Further, the rear portion of the seedling supply device 38 of the third transplant unit 36C protrudes rearward from the first transplant unit 36A and the second transplant unit 36B, and the plurality of chairs are arranged in front of the first transplant unit 36A. The first front chair 187A, the second front chair 187B disposed in front of the second transplant unit 36B, and the side of the first transplant unit 36A opposite to the side where the third transplant unit 36C is disposed. The first side chair 187C disposed on the side of the side and the second side disposed on the side opposite to the side on which the third transplant unit 36C is disposed on the side of the second transplant unit 36B. Two side chairs 187D, a third side chair 187E located behind the third transplantation unit 36C and behind the first transplantation unit 36A, and laterally behind the third transplantation unit 36C and First And a fourth side Kata Isu 187F which is disposed behind the transplant unit 36B, the.

According to this configuration, the chair on which the worker U1 who supplies seedlings to the third transplanting unit 36C sits can be compactly arranged behind the first transplanting unit 36A and the second transplanting unit 36B. it can.
In addition, in order for the worker U1 to supply seedlings to the supply cups 171 and 172, a seedling supply base 188 on which the seedling tray 189 is placed is provided.

According to this configuration, the seedling placing stand 190 on which the spare seedling tray 189 is placed can be provided at a position close to the worker U1, and when the seedlings on the seedling tray 189 of the seedling supply stand 188 are exhausted, A seedling can be easily taken from the mount 190.
Although one embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Working machine 64 Planting tool 105 Power transmission mechanism 111A Rotating shaft 111B Rotating shaft 111C Rotating shaft 116R Second transmission member (drive sprocket)
139 Planting elevating mechanism 152 Compression spring 153 Spring operating mechanism 154 Rotating member 155 Movable rod 156 Holder 157 Restricting tool 166 Adjusting unit 167 First transmission member E1 Drive source

Claims (7)

A planting tool for moving up and down by the power of the driving source, holding and lowering the seedling and entering the field and planting the seedling;
A compression spring that urges the planting tool in the direction of raising;
A spring operating mechanism that operates by power to raise and lower the planting tool, compresses the compression spring when the planting tool descends, and extends the compression spring when the planting tool rises;
Work machine equipped with. The spring operating mechanism is
A movable rod that reciprocates once in the axial direction along with the movement of the planting tool reciprocating up and down once;
A holder for supporting the movable rod so as to be movable in the axial direction;
A restricting tool attached to the movable rod so as to be movable together,
The compression spring is interposed between the restriction tool and the holder. When the planting tool is lowered, the compression spring is compressed by moving in a direction approaching the holder and the planting is performed. The work machine according to claim 1, wherein when the tool is raised, the restricting tool is extended by moving in a direction away from the holder. The spring operating mechanism is
A rotating member that rotates once while the planting tool reciprocates up and down;
One end of the movable rod is pivotally supported by a portion deviated from the rotation center of the rotating member,
The work implement according to claim 2, wherein the restricting tool is attached between the one end of the movable rod and the holder.   The work implement according to claim 2 or 3, wherein the restricting tool is attached so that its position can be changed in the axial direction of the movable rod.   The work machine according to any one of claims 1 to 4, further comprising an adjustment unit that adjusts a relationship between a position of the planting tool and an expansion / contraction state of the compression spring. A planting lifting mechanism for supporting the planting tool so as to be lifted and lowered;
A power transmission mechanism for transmitting the power of the drive source to the planting lifting mechanism;
With
The power transmission mechanism has a rotation shaft that is driven around an axis by the power of the drive source,
With one rotation around the axis of the rotating shaft, the planting tool reciprocates up and down and the compression spring expands and contracts,
The adjustment unit is
A first transmission member that rotates integrally with the rotary shaft;
A second transmission member coupled to the first transmission member and integrally rotating and transmitting power to the planting lifting mechanism, wherein a rotational position around the axis of the rotary shaft relative to the first transmission member; The working machine according to claim 5, further comprising a second transmission member capable of adjusting a position. A planting lifting mechanism composed of a link mechanism that supports the planting tool so as to be lifted and lowered;
The working machine according to claim 1, wherein the spring operating mechanism is operated by a swinging operation of the planting lifting mechanism to expand and contract the compression spring.

Images