JP6406387B2 - Seedling transplanter - Google Patents

Description

  The present invention relates to a seedling transplanting machine that includes a planting device for planting seedlings in a farm field and that automatically raises and lowers the planting apparatus when turning at a field edge or the like.

  In a conventional seedling transplanter (for example, see Patent Document 1), in a reciprocating planting operation in a farm field, when the traveling vehicle body reaches the end of the farm field and moves to a cornering movement, the planting unit is linked to the turning operation of the handle. It rises automatically. After that, when the difference between the rotational speeds of the left and right rear wheels becomes less than a certain value during the turning, it is determined that the turning is completed, the motor is operated to automatically lower the planting portion, and the traveling vehicle body It is set as the structure which a planting apparatus act | operates when it advances a predetermined distance.

  This eliminates the need for the operator to manually move the planting unit up and down and the planting device on and off before and after the turn, which facilitates the turn operation.

  Another conventional seedling transplanter (see, for example, Patent Document 2) has a configuration in which left and right line drawing markers that draw a line as a mark at the next planting work position are alternately switched in a reciprocating planting work in a farm field. It has become. In other words, the above configuration is a configuration in which the operating direction of the drawing marker is switched every time the planting portion is moved up and down.

  Therefore, if the planting part is moved up and down by replenishment work etc. before turning, the drawing marker on the side where the seedling has already been planted will operate, but at that time, the planting part can be raised and lowered Then, the appropriate side draw marker is activated.

JP 2012-005385 A JP 2010-246409 A

  However, according to the seedling transplanting machine described in Patent Document 1, when the difference between the left and right rear wheel rotational speeds becomes less than a certain value, the motor is forcibly activated to automatically start the lowering of the planting part. The operator cannot change the descending timing of the planting unit or the operation timing of the planting device, the planting start position of the seedling cannot be adjusted to the planting end position of the adjacent strip, and the planting accuracy is lowered. There's a problem.

  In addition, when the mechanism of Patent Document 2 is added to Patent Document 1, the motor generates a holding torque even while the rotation is stopped until the planting part is completely lowered or the planting device is activated. Therefore, under the configuration in which the operation lever (planting lift lever) is fixed so as not to be operated to the “up” side, when the drawing marker on the side where the seedling has already been In order to activate the side draw marker, the operator cannot operate the work operation lever to raise the planting part, and the worker does not move the work operation lever until the motor holding torque is released. There is a problem that the work efficiency is lowered because it is necessary to wait for the operation.

  In addition, if the timing for raising the planting part is late at this time, there is a problem that seedlings are planted in the field, resulting in useless seedlings.

  Furthermore, if you try to lift the planting part by forcibly operating the work control lever by the time the motor holding torque is released, the motor or motor and the interlocking member of the planting operation mechanism Is overloaded and may be damaged.

  An object of the present invention is to provide a seedling transplanting machine that allows an operator to operate a work operation lever to the “up” side when turning, considering the problems of the conventional seedling transplanting machine.

In order to solve the above-mentioned problems, the present invention according to claim 1 is a planting method for planting a steering member (34) for operating the traveling direction of a traveling vehicle body (2) and a seedling provided on the rear side of the traveling vehicle body (2). The planting device (52), the work operation lever (33) for raising and lowering and planting the planting device (52), and the planting device (52) in conjunction with the turning operation of the steering member (34). In a seedling transplanting machine comprising a turning interlocking mechanism for lowering and starting planting by the planting device (52),
A control circuit (200) for lowering the planting device (52) in conjunction with the pivot interlocking mechanism or starting planting;
A detection device (93) for detecting the raising and lowering of the planting device (52) and the start operation and the cutting operation of the planting operation is provided,
The control circuit (200) stopped the seedling transplanter for a predetermined time or more during the turning after the detection device (93) detected the raising of the planting device (52) and the cutting operation of the planting operation . When the operation is not detected in the state, the turning interlocking by the turning interlocking mechanism is stopped ,
A switching cam (74) that rotates to a position corresponding to the operation of raising and lowering the planting device (52) and planting operation in conjunction with the operation of the work operation lever (33) or the turning interlocking mechanism is provided, and the detection The device (93) detects the rotation angle of the switching cam (74),
A rotating device (99) for rotating the switching cam (74);
The detection device (93) detects that the work operation lever (33) is operated in a direction to raise or stop the planting device (52) from a position corresponding to lowering or planting during the turning interlock. Upon detection, the turning device (99) stops the turning interlock,
A first connecting member (102) is provided on a rotating arm (103) that is rotated by the operation of the rotating device (99), and the first connecting member (102) and the switching cam (74) are connected to a spring member (100). And a long hole for connection (104) is formed in the spring member (100), and the first connection member (102) is arranged to be movable along the longitudinal direction of the long hole (104). The seedling transplanting machine is characterized in that an interlocking stop mechanism is constructed .

Further, according to the present invention, the operation control lever (33) is operated in a direction to raise or stop the planting device (52) from a position corresponding to lowering or planting during the turning interlock. When the detection device (93) detects that
The rotating device (99) is rotated so that the first connecting member (102) is moved along the longitudinal direction of the elongated hole (104), or the switching cam (74) is moved to a work operation lever ( 33. The seedling transplanter according to claim 1, wherein a holding torque of the rotating device (99) held at the operation position of 33) is reduced .

Moreover, this invention of Claim 3 provides the switching auxiliary arm (76) which raises the said planting apparatus (52) by turning operation of the said steering member (34),
The switching auxiliary arm (76) is fitted in a state where it is biased into a plurality of recesses (751a, 751b, 751c, 751d) of a notch (75) formed in the switching cam (74). The positioning roller (77) for positioning the rotation of the cam (74) is rotatably held, and the switching auxiliary arm (76) and the rotation arm (103) are connected by a pull wire (310). And
By the rotation of the rotation arm (103) by the rotation drive of the rotation device (99), the switching cam (74) is rotated from the ascending or stopping position of the planting device (52) toward the descending position. When this is done, the pull wire (310) pulls the switching auxiliary arm (76) in a direction that relaxes the biasing state of the positioning roller (77), and the switching cam (74) is a planting device. The pulling wire (310) is loosened and the urging state of the positioning roller (77) is maintained when it is rotated from the lowered position to the stopped or raised position in (52). A seedling transplanter according to claim 1 or 2 is provided.

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In the first invention related to the first to third aspects of the present invention, a rotating device (99) that moves the intermediate mechanism (74, 77) in conjunction with the turning interlocking mechanism is provided, and the rotation A control circuit (200) for lowering the planting device (52) or starting planting in accordance with the travel distance detected by the sensor (182) is provided, and the control circuit (200) is provided by the turning interlock mechanism. When the work operating lever (33) is operated in a direction to raise or stop the planting device (52) when the planting device (52) is lowered or when planting is started, the rotation is stopped. The seedling transplanting machine is characterized in that the moving device (99) is operated to stop the turning interlocking by the turning interlocking mechanism.

  According to the first aspect of the present invention, it is possible to provide a seedling transplanting machine that allows the operator to operate the work operation lever (33) to the “up” side during turning.

  Further, when the rotation angle of the switching cam (74) does not change for a predetermined time or more and the traveling is stopped for the predetermined time or more, the rotation device (99) is operated to interlock the rotation. By stopping the pivot interlocking by the mechanism, the work operation lever (33) can be operated to raise the planting device with a light force, so that the operation of the work operation lever (33) by the operator becomes a resistance. Thus, it is possible to prevent an overload from being applied to the swivel interlocking mechanism, thereby preventing the swivel interlocking mechanism from being damaged.

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Further , during the interlocking operation of the turning interlock mechanism, the work operation lever (33) is operated from the position corresponding to the descent or planting to the position corresponding to the stop according to the detection result of the detection device (93). Alternatively, when it is determined that the position has been returned to the position corresponding to the stop, the interlock stop mechanism is configured to stop the interlock operation. When the lever (33) is mistakenly operated, the interlocking operation of the turning interlocking mechanism is prevented from being reactivated, and the planting start position of the seedling after turning is not extremely shifted back and forth. Planting accuracy is improved.

Further , during turning, when the operator operates the work operation lever (33) so as to oppose the operation of the turning interlocking mechanism, the spring member (100) which is the interlocking stop mechanism is extended to Since the operation of the operation lever (33) by the operator becomes a resistance and an overload can be prevented from being applied to the turning interlock mechanism, the turning interlock mechanism such as the turning device (99) and the turning arm (103) is configured. The member is prevented from being damaged.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the pull wire (310) is activated in the pulling direction operation requiring a strong force. Since the switching auxiliary arm (76) can be moved downward with a lighter force, the work efficiency is improved.
That is, by attaching one end of the pulling wire (310) to the switching auxiliary arm (76), when the rotating arm (103) rotates and the pulling wire (310) is pulled, the switching auxiliary arm (76). ) Is pulled down, and the positioning roller (77) is easily separated from the plurality of recesses (751a to 751d) of the switching cam (74).

For this reason, for example, the rotation arm (103) is rotated in a direction corresponding to the “down” direction of the work operation lever by the rotation drive of the rotation device (99), and the pulling wire (310) is switched back to the switching auxiliary arm. When the lift arm 76 is pulled downward, even when the operator manually moves the work operation lever (33) in the “stop” direction, the switching cam (74) is easily rotated. The labor of the worker is reduced.
Moreover, since the torque of the rotating device (99) can be set lower than the conventional one, the cost can be reduced.

According to the third aspect of the present invention, in addition to the effect of the first or second aspect of the present invention, the pull wire (310) is configured to operate in the pulling direction operation requiring a strong force. As a result, the switching auxiliary arm (76) can be moved downward with a lighter force, so that the work efficiency is improved.
That is, by attaching one end of the pulling wire (310) to the switching auxiliary arm (76), when the rotating arm (103) rotates and the pulling wire (310) is pulled, the switching auxiliary arm (76). ) Is pulled down, and the positioning roller (77) is easily separated from the plurality of recesses (751a to 751d) of the switching cam (74).
For this reason, for example, the rotation arm (103) is rotated in a direction corresponding to the “down” direction of the work operation lever by the rotation drive of the rotation device (99), and the pulling wire (310) is switched back to the switching auxiliary arm. When the lift arm 76 is pulled downward, even when the operator manually moves the work operation lever (33) in the “stop” direction, the switching cam (74) is easily rotated. The labor of the worker is reduced.
Moreover, since the torque of the rotating device (99) can be set lower than the conventional one, the cost can be reduced.

According to the first to third aspects of the invention and the first related invention, at the time of turning, the operator operates the work operation lever (33) so as to oppose the operation during the operation of the turning interlocking mechanism. When operated, the configuration in which the interlocking operation of the swing interlocking mechanism is stopped required to raise and lower the planting device (52) during the swing and to stop the planting operation of the planting device (52). At this time, it is not necessary to wait for the operation of the operation lever (33) until the interlocking operation of the swivel interlocking mechanism is stopped, and the planting start position of the seedling can be aligned. Accuracy is improved.

  Further, when turning, when the operator operates the work operation lever (33) so as to counteract the operation of the turning interlocking mechanism, the interlocking operation of the turning interlocking mechanism is stopped. Since the operation of the work operation lever (33) by the person can be prevented from being overloaded to the turning interlocking mechanism, the turning interlocking mechanism is prevented from being damaged.

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The right view of the seedling transplanter in embodiment concerning this invention Top view of the seedling transplanter Enlarged right side view inside the front part of the seedling transplanter Top view of the pitman arm of the seedling transplanter An enlarged front view of the inside of the seedling transplanter when viewed from the front of the traveling vehicle body Right side view showing the area around the switching cam of the seedling transplanter Schematic front view showing the vicinity of the switching cam when looking forward from the rear of the traveling vehicle body Schematic perspective view for explaining the vicinity of the switching cam Side view showing the relationship between the planting lift lever and switching cam of the seedling transplanter (A): Motor arm and enlarged side view around planting spring, (b): Schematic view of the vicinity of the motor arm as seen from the direction of arrow D in FIG. Illustration of the control circuit of the seedling transplanter Side view centering on a switching cam showing the ascending state of the planting device when the seedling transplanter is turning Side view centered on a switching cam showing the fixed (stopped) state of the planting device in the seedling transplanter Side view around switching cam showing lowering state of planting device in seedling transplanter Side view centering on the switching cam showing the planting state of the planting device in the seedling transplanter Explanatory drawing to show the relationship between the shift lever and bar of the seedling transplanter Schematic diagram showing the running trajectory in the field of the seedling transplanter The schematic side view explaining the 2nd turning switching operation part of the seedling transplanter Schematic perspective view of the configuration in which the cable end of the seedling transplanter is directly connected to the tip of the bar (A): Schematic plan view showing the configuration of the inter-strain lever of the same seedling transplanter, (b): Side view of the inter-strain lever of the same seeding transplanter as seen from the direction F in FIG.

  Hereinafter, a seedling transplanter according to an embodiment of the present invention will be described with reference to the drawings.

  FIG.1 and FIG.2 is the side view and top view of the seedling transplanter 1 concerning this Embodiment.

  In this seedling transplanter 1, a planting device 52 is mounted on the rear side of the traveling vehicle body 2 via the lifting link device 3 so as to be movable up and down, and a main body portion of the fertilizer application device 5 is provided on the rear upper side of the traveling vehicle body 2. .

  As shown in FIGS. 1 and 2, the traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 that are drive wheels. A mission case 12 is arranged, front wheel final cases 13 and 13 are provided on the left and right sides of the mission case 12, and outward from each front wheel support portion capable of changing the steering direction of the left and right front wheel final cases 13 and 13. The left and right front wheels 10 and 10 are respectively attached to the left and right front wheel axles that protrude in the direction.

  The front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and on the other hand, the rear wheel vertical movement fulcrum shaft 181 provided horizontally at the rear left and right center portion of the main frame 15 is used as a fulcrum. The rear wheel gear cases 18 and 18 are supported in a freely rolling manner, and the rear wheels 11 and 11 are attached to a rear wheel axle 17 that protrudes outward from the left and right rear wheel gear cases 18 and 18.

  The power is transmitted to the left and right rear wheel gear cases 18 and 18 by the left and right rear wheel transmission shafts 18a and 18a connected to the left and right rear wheel gear cases 18 and 18 provided to protrude from the rear wall of the transmission case 12. It has become.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via a belt transmission device 21 and an HST (hydrostatic stepless transmission) 23. The rotational power transmitted to the mission case 12 is shifted by a transmission in the case 12 and then separated into traveling power and external power to be extracted. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the left and right rear wheel gear cases 18 and 18 to drive the left and right rear wheels 11 and 11. .

  Further, the external extraction power extracted from the right side surface of the mission case 12 is transmitted to the planting device 52 by the planting transmission shaft 26. The power is taken out from the right rear wheel gear case 18 by the drive shaft and transmitted to the fertilizer feeding mechanism of the fertilizer applicator 5.

  The upper part of the engine 20 is covered with an engine cover 30, and a seat 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the seat 31, and a steering member (steering handle) 34 for steering the front wheels 10, 10 is provided above the front cover 32. Reference numeral 35 denotes a hand shaft. A reservoir tank 16 is provided in the front cover 32 and is connected to the HST 23 by a pipe 19 so that oil is supplied to the HST 23 from a high position.

  A planting elevating lever 33 for setting the elevating / lowering of the planting device 52 is provided on the right side of the steering member 34. An example of the work operation lever of the present invention corresponds to the planting lift lever 33.

  Further, on the left side of the steering member 34, a shift lever 36 for setting forward, stop (idling), reverse, speed, etc. of the traveling vehicle body 2 is provided.

  The engine cover 30 and the front cover 32 have horizontal floor steps 37 on the left and right sides of the lower end.

  A plurality of through holes are formed in the left and right front portions of the floor step 37, so that a driver who is seated on the seat 31 and controls the aircraft can see the left and right front wheels 10 and 10 and is easy to control. At the same time, the mud on the shoes of the worker walking in the step 37 falls on the field.

  The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side. ing. Then, a connecting shaft instructed to rotate freely by the planting device 52 is inserted and connected to the lower end portion of the vertical link 43, and the planting device 52 is connected so as to be able to roll around the connecting shaft.

  A tip of a lifting hydraulic cylinder 46 whose base is pivotally supported on the main frame 15 is connected to a tip of a swing arm (not shown) formed integrally with the upper link 40, and the lifting hydraulic cylinder By expanding and contracting 46 with hydraulic pressure, the upper link 40 rotates up and down, and the planting device 52 moves up and down while maintaining a substantially constant posture.

  Reference numerals 28 and 28 are left and right auxiliary steps, which are steps for placing a foot when an operator gets on and off the aircraft.

  Next, FIG. 3 is an enlarged side view of the front portion of the seedling transplanter 1 according to the present embodiment, and FIG. 5 is an enlarged front view of the seedling transplanter 1. FIG. 4 is a plan view of the pitman arm.

  As shown in FIG. 3, a T-shaped pitman arm 60 that rotates the front wheels 10 and 10 under the steering of the steering member 34 is provided on the front bottom side of the traveling vehicle body 2. That is, in response to the rotation of the steering member 34, the steering member shaft 35 rotates, and the T-shaped pitman arm 60 rotates through the pinion mechanism or the power steering mechanism. Reference numeral 60b denotes the rotation shaft (see FIG. 4).

  Two tie rods are rotatably attached to the two T-shaped tip portions 60a and 60a of the pitman arm 60, and the tie rods are attached to the left and right front wheel final cases 13 and 13, respectively. (Not shown).

  Accordingly, by steering the steering member 34, the right and left front wheels 10 can be operated to run left and right.

  On the other hand, the pitman arm 60 has a T-shape that is symmetrical with respect to the left and right lines as described above, and the cylindrical pin 61 stands at an intermediate position between the left and right tip portions 60a and 60a, that is, on the center line that is symmetrical with respect to the left and right lines. Has been established. A rod 62 is rotatably attached to the upper end of the cylindrical pin 61 horizontally in the forward direction. Further, a connecting pin 63 is fixed to the side surface of the tip 62a of the rod 62, and an arm 64 (64a, 64b, 64c) is attached to the end of the connecting pin 63. The arm 64 (64a, 64b, 64c) is composed of an upward portion 64a, a horizontally extending portion 64b, and a further extending portion 64c therefrom (see FIG. 5). As described above, since the rod 62 is located on the center line of the pitman arm 60, there is an effect that the same amount of pulling force is produced in both the right turn and the left turn.

  An autolift cable 71 is rotatably attached to an upper end 64c1 of the upper portion 64c of the arm 64.

  3 and 5, reference numeral 72 denotes a cable end connected to the above-described autolift cable 71. The cable end 72 is connected to the turning switching operation unit 73 so as to be rotatable. 74 is a switching cam, 751 is a positioning groove of the switching cam 74, 76 is a backlift arm, 77 is a positioning roller, and 78 is forward of the switching cam 74 (in FIG. ) 99 is a servo motor that rotates the switching cam 74 during reverse travel.

  Next, FIG. 6 is a side view showing the vicinity of the switching cam of the seedling transplanter 1 of the present embodiment, and FIG. 7 is a schematic front view showing the vicinity of the switching cam when the front is viewed from the rear of the traveling vehicle body 2. 8 is a perspective view showing the vicinity of the switching cam. FIG. 8 is a diagram drawn for easy understanding of the arrangement relationship of the members, and is a schematic diagram exaggerating the dimensions, arrangement, and shape.

  As shown in FIG. 6, the lower end 33 a of the planting lifting / lowering lever 33 for setting the ascending / stopping / lowering / planting operation of the planting device 52 is rotatably attached to the shaft 80 via the bracket 81. In addition, the upper end of the switching cam 74 is fixed to the bracket 81. Therefore, the switching cam 74 can be rotated by moving the planting lift lever 33. Further, as described above, the switching cam 74 is always urged in the forward direction by the spring 78 (see FIGS. 3 and 5) (the arrow A direction in FIG. 8). The switching cam 74 is formed with a horizontally long window 75 as an example of a notch portion of the present invention in the center. On the upper edge of the window 75, there are four positioning grooves 751 (an example of a plurality of recesses of the present invention) (first groove 751a, second groove 751b, third groove 751c, Four grooves 751d) are formed side by side. The front end of a positioning roller 77 disposed horizontally in the width direction of the traveling vehicle body 2 is inserted into the window 75.

  The positioning roller 77 is fixed to a backlift arm 76, which will be described later, and is rotatably supported by a support shaft 79 located at the rear end portion of the backlift arm 76.

  The positioning roller 77 is always urged upward by a spring (not shown), and is positioned above any of the four positioning grooves 751 (first to fourth grooves 751a, 751b, 751c, 751d). Although it is fitted about half, it can be moved downward against the spring by various forces described later. The various forces include, for example, a pulling force due to a pulling wire 310 (see FIG. 10A) described later.

  Further, as shown in FIG. 8, the positioning roller 77 is horizontally disposed in the left-right direction of the traveling vehicle body 2, but on the inner side of the switching cam 74 (the back side of the switching cam 74 in FIG. 8). First, the backlift arm 76 is fixed. Further, a back lift on / off lever 82 is rotatably connected to the back side. Since the backlift arm 76 is rotatably connected to the support shaft 79, the backlift on / off lever 82 is also rotatable about the support shaft 79.

  Further, as shown in FIG. 8, a turning switching operation unit 73 is disposed in the gap between the switching cam 74 and the backlift arm 76. The rear end of the turning switching operation unit 73 and the backlift arm 76 are rotatably connected to a common support shaft 79.

  As shown in FIGS. 6 and 8, the cable end 72 connected to the autolift cable 71 is rotatably connected to the front end of the turning switching operation unit 73 via the pin 721 as described above. ing. Accordingly, in conjunction with the movement of the pitman arm 60, the turning switching operation unit 73 moves up and down around the support shaft 79. Further, a first hole 732 is opened at the center position of the turning switching operation unit 73, and a lock pin 731 is normally fitted in the first hole 732 (see FIGS. 6 and 8). The lock pin 731 is fixed to the backlift arm 76. Therefore, normally, the backlift arm 76 moves up and down around the support shaft 79 as the turning switching operation unit 73 moves in the up and down direction.

  Since the back lift arm 76 is fixed to the positioning roller 77, the positioning roller 77 is also moved in the vertical direction as the back lift arm 76 is moved in the vertical direction. Of course, the turning switching operation unit 73 can be manually moved in the left-right direction of the traveling vehicle body 2 (perpendicular to the paper surface of FIG. 6) and arbitrarily removed from the lock pin 731.

  Note that by removing the turning switching operation unit 73 from the lock pin 731, the automatic interlocking function in which the positioning roller 77 moves downward in conjunction with the movement of the pitman arm 60 is stopped. The planting device 52 does not automatically rise when turning and turning.

  When the positioning roller 77 moves downward, it is disengaged from the positioning groove 751, so that the switching cam 74 is rotated in the direction of arrow A (see FIG. 8).

  On the other hand, as shown in FIGS. 6 and 8, the backlift on / off lever 82 is provided with an inverted L-shaped cutout hole 84. That is, the cutout hole 84 is constituted by the vertically long portion and the horizontally long portion. The notch hole 84 is inserted with the tip of a bar 83 disposed substantially horizontally in the left-right direction of the traveling vehicle body 2. As shown in FIG. 16, when the shift lever 36 is set to the reverse side (reverse idling position) by the operator's manual operation, the rod 361 that rotates in response to the movement of the shift lever 36 is The bar 83 is moved downward through the cable 362. Here, FIG. 16 is a schematic plan view of the speed change lever 36 and an explanatory view showing the relationship between the speed change lever and the bar 83.

  Accordingly, when the bar 83 is positioned in the horizontally long portion of the L-shaped cutout hole 84, the back lift on / off lever 82 is pushed and moved downward by moving the bar 83 downward. . As described above, since the back lift on / off lever 82 is connected to the positioning roller 77, the positioning roller 77 moves downward.

  On the other hand, when the bar 83 is positioned in the vertically long portion of the L-shaped cutout hole 84, even if the bar 83 moves downward, the bar 83 stops moving. The force to push down does not work, and the positioning roller 77 does not move downward.

  Further, as described above, since the backlift on / off lever 82 is rotatably connected to the positioning roller 77, the operator manually rotates the backlift on / off lever 82 to position it appropriately (the arrow in FIG. 8). By pushing backward or as shown by arrow C in FIG. 8), the back lift on / off lever 82 and the positioning roller 77 are automatically operated during reverse running as described above. A mode in which the button is pushed downward (a mode corresponding to the case of pushing backward as indicated by arrow B in FIG. 8) and a mode in which the button is not pushed down (a mode corresponding to the case of being pulled forward as indicated by arrow C in FIG. 8), An operator can arbitrarily select in advance.

  As shown in FIG. 6, the turn switching operation unit 73 described above protrudes forward from the backlift on / off lever 82, so that the turn switching operation unit 73 is easier to handle. As a result, the on / off frequency of the backlift on / off lever 82 is usually less than the switching frequency of the turning switching operation unit 73, which is convenient for the operator.

  Next, FIG. 9 shows the relationship between the planting lift lever 33 and the switching cam 74, and the motor arm 103 and the motor arm 103 fixed to the motor arm rotation shaft 101 that rotates in conjunction with the movement of the servo motor 99. It is a side view which shows the planting spring 100, the potentiometer 93, etc. which connect the switching cam 74. FIG. FIG. 10A is an enlarged view of the periphery of the motor arm 103 and the planting spring 100, and FIG. 10B is a schematic view of the vicinity of the motor arm 103 viewed from the direction of arrow D in FIG. .

  The relationship between the planting lift lever 33 and the switching cam 74, the servo motor 99, the planting spring 100, the potentiometer 93, and the like will be described below with reference to FIGS.

  As shown in FIG. 9, depending on the position of the planting lifting / lowering lever 33, “up”, “stop”, “down”, and “planting” modes can be switched and set from the front. On the other hand, the first to fourth grooves 751a, 751b, 751c, and 751d of the switching cam 74 correspond to “up”, “stop”, “down”, and “planting”, respectively. That is, when the operator manually sets the planting elevating lever 33 to the “up” position, for example, the switching cam 74 rotates counterclockwise (see the arrow E in FIG. 9) about the shaft 80, and the positioning roller 77 recedes relatively and fits in the first groove 751a. When the planting lift lever 33 is set at the “stop” position, the switching cam 74 moves a little later, and the positioning roller 77 fits in the second groove 751b. Further, when the planting elevating lever 33 is set by hand, for example, to the “down” position (the state shown in FIG. 9), the switching cam 74 moves a little later, and the positioning roller 77 is accommodated in the third groove 751c. Further, when the planting elevating lever 33 is set by hand, for example, to the “planting” position, the switching cam 74 moves further a little later, and the positioning roller 77 fits in the fourth groove 751d.

  In this way, by operating the planting lift lever 33, the switching cam 74 can be moved to four different positions.

  The movement of the switching cam 74 is linked to the switching operation of a switching valve 461 (see FIG. 1) that switches the oil path to the lifting hydraulic cylinder 46 of the planting device 52 via a wire, a rod, an arm, or the like. This is interlocked with an on / off operation of a planting clutch (not shown) for turning on / off a planting operation by a planting claw 521 (see FIG. 1) provided in the planting device 52. As a result, by the interlock, the raising / lowering, stopping, lowering, and planting of the planting device 52 are controlled by the movement of the switching cam 74, respectively.

  An example of the intermediate mechanism of the present invention corresponds to a configuration including the positioning roller 77, the switching cam 74, the switching valve 461, and the like.

  Further, as shown in FIG. 9, near the rear of the switching cam 74, a servo motor 99 as an example of the rotating device of the present invention, a motor arm 103 as an example of the rotating arm of the present invention, and the connecting member of the present invention. A planting spring 100 as an example, and a potentiometer 93 as an example of a rotation angle detection device of the present invention are disposed. Moreover, an example of the turning interlocking mechanism of the present invention corresponds to a configuration including a potentiometer 93, a servo motor 99, a planting spring 100, a motor arm 103, and the like.

  That is, as shown in FIG. 11, the servo motor 99 is output from the control circuit 200 that receives the output from the potentiometer 93 and the output from the rotation sensor 182 that detects the respective rotation speeds of the pair of left and right rear wheels 11 and 11. Is a means for rotating the motor arm rotation shaft 101 clockwise or counterclockwise. The control circuit 200 is a computer that drives and controls the servo motor 99 using the output signals from the potentiometer 93 and the rotation sensor 182. In addition, FIG. 11 is explanatory drawing of the control circuit of the seedling transplanter 1 of this Embodiment. The rotation sensor 182 is an example of the rotation speed detection device of the present invention.

  Further, as shown in FIGS. 9, 10 (a), and 10 (b), the motor arm 103 is fixed to the motor arm rotation shaft 101. Therefore, the motor arm 103 also rotates clockwise or counterclockwise. A first pin 102 is erected at the center of the motor arm 103, and a second pin 300 is erected at the tip. An example of the first connecting member of the present invention corresponds to the first pin 102, and an example of the second connecting member of the present invention corresponds to the second pin 300.

  On the other hand, as shown in FIGS. 9 and 10 (a), a third pin 105 stands at a position from the rear of the switching cam 74 from the back side (the back side in FIG. 9) to the back side in the drawing. Has been established. One end side of the planting spring 100 is connected to the third pin 105 so as to be rotatable. Further, the planting spring 100 has a first elongated hole 104 formed in the longitudinal direction on the other end side, and a coiled compression spring 100a is formed on the one end side adjacent to the first elongated hole 104. ing. The first pin 102 of the motor arm 103 described above is fitted in the first long hole 104 so as to be rotatable and slidable. The configuration including the servo motor 99, the planting spring 100, the motor arm 103, and the like corresponds to an example of the interlock stop mechanism of the present invention.

  Thus, when the traveling vehicle body 2 turns, the operator can counteract the operation during the operation of the servo motor 99, the motor arm 103, etc. as an example of the turning interlock mechanism of the present invention, that is, stop or When the planting lifting / lowering lever 33 is operated toward the ascending position, the coiled compression spring 100a of the planting spring 100 as one component included in the interlock stop mechanism of the present invention extends, so that the planting lifting / lowering by the operator is performed. Since the operation of the lever 33 becomes a resistance and an overload can be prevented from being applied to the turning interlock mechanism (for example, the servo motor 99, the motor arm 103, etc.), the turning interlock mechanism is prevented from being damaged.

  Further, as shown in FIG. 10A, a fourth pin 320 is erected on the lower portion on the front end side of the backlift arm 76 which is an example of the switching auxiliary arm of the present invention. The backlift arm 76 and the motor arm 103 are coupled to each other by the pull wire 310 via the wire coupling member 310a at the fourth pin 320 and the second pin 300.

  (1) When the switching cam 74 is rotated from the position corresponding to the ascending or stopping to the position corresponding to the descending (see FIG. 9) by the rotation of the motor arm 103 by the rotational drive of the servo motor 99. The pulling wire 310 pulls the backlift arm 76 in a direction that reduces the upward biasing force (biasing force) by the positioning roller 77, and (2) the switching cam 74 is moved by the operation of the planting lift lever 33. When rotated from the position corresponding to the descent toward the position corresponding to the stop or ascending (see FIG. 10A), the pull wire 310 is loosened, and the urging state by the positioning roller 77 is maintained as it is. It is a configuration.

  With this configuration, the pull wire 310 is activated during operation in the pulling direction that requires a strong force, so that the backlift arm 76 can be moved downward with a lighter force. The required torque can be reduced compared to the conventional case, and the cost can be reduced.

  Further, as shown in FIG. 10B, the tip of the second pin 300 protrudes outward, that is, on the right side of the traveling vehicle body 2 with respect to the left and right direction of the traveling vehicle body 2 as compared with the distal end of the first pin 102. . Then, in order to dispose the pull wire 310 outside the planting spring 100 with respect to the left-right direction of the traveling vehicle body 2, the attachment position of the pull wire 310 to the second pin 300 of the wire connecting member 310a is the front end side. The both sides are positioned by the split pins 300a. Thereby, the pull wire 310 and the planting spring 100 do not interfere with each other during the operation, and the operation of automatically lowering the planting device 52 as an example of the interlocking operation of the turning interlocking mechanism of the present invention, Thereafter, the operation of automatically starting the planting operation can be surely stopped, and the backlift arm 76 can be operated with a light force.

  Next, the configuration of the potentiometer 93 and the like will be described with reference to FIG.

  That is, the triangular plate 90 is fixed to the rear end of the switching cam 74 so as to protrude rearward in order to detect the position of the switching cam 74. A pin 91 is fixed near the apex of the plate 90. On the other hand, a potentiometer 93 is provided below the servo motor 99 and the like described above. The potentiometer 93 has a meter arm 92 which is fixed to the shaft 93a and has a second long hole 94. The rotation angle of the meter arm 92 is detected. And the pin 91 of the plate 90 mentioned above is fitted in the 2nd long hole 94 so that rotation and sliding are possible.

  Accordingly, the plate 90 and the pin 91 move corresponding to the above-described four types of positions of the switching cam 74 (see FIG. 9), and as a result, the meter arm 92 also rotates correspondingly. As a result, the potentiometer 93 can accurately detect the position of the switching cam 74.

  In addition, it is longer than the movable range of the pin 91 which moves corresponding to the movement of the switching cam 74, and the 2nd long hole 94 is opened, Therefore A false detection can be prevented.

  Next, the relationship among the servo motor 99, the motor arm 103, the planting spring 100, the switching cam 74, the potentiometer 93, the control circuit 200, and the like will be described with reference to FIGS.

  The traveling vehicle body 2 during the planting operation reaches the end of the field and moves to turn, and along with the turn, the control circuit 200 outputs from the rotation sensor 182 that detects the number of rotations of the pair of left and right rear wheels 10 and 10. When a signal is obtained and the difference in the rotational speed between the rear wheels 10 and 10 becomes a predetermined number or less, it is determined that the turning operation of the traveling vehicle body 2 is completed, and the switching cam is connected to the servo motor 99. In this configuration, a “lowering command” for moving 74 from a position corresponding to “up” to a position corresponding to “down” is output.

  On the other hand, the servo motor 99 is configured to rotate the motor arm 103 in advance and to stop the first pin 102 in advance at a standby position in preparation for a command from the control circuit 200. In this standby position, the first pin 102 only slides relatively in the first long hole 104 regardless of the position of the operator to move the planting lift lever 33 to the first long hole 104. This is a position where the inner wall of the hole 104 is not pushed by a strong force, that is, a position where a load that damages the servo motor 99, the motor arm 103, etc. is not applied. The servo motor 99 generates a predetermined holding torque so that the first pin 102 is not displaced from the standby position by an external force even during standby stop.

  When the “lowering command” is output from the control circuit 200 to the servo motor 99, as shown in FIG. 9, the motor arm 103 is rotated clockwise by a predetermined angle so that the planting spring 100 is moved. The first pin 102 is forcibly pulled backward, and the switching cam 74 is automatically moved to a position corresponding to “down”.

  At this time, the force (restoring force) to compress the compression spring 100a of the planting spring 100 is configured to be larger than the pulling force by the first pin 102, so that the compression spring 100a extends. Therefore, the switching cam 74 does not move.

  Further, the switching cam 74 is forcibly moved by the drive of the servo motor 99 so that the planting lift lever 33 is moving to the “down” or “planting” position, or after the operator moves, On the other hand, when the planting lift lever 33 is moved in the direction of the “stop” position, for example, the compression spring 100a is an elastic body and thus extends, so that the servo motor 99 which is an example of the turning interlock mechanism of the present invention. And the members such as the motor arm 103 are prevented from being damaged.

  At this time, since the compression spring 100a is extended, the switching cam 74 starts to move from the “down” position toward the “stop” position in conjunction with the movement of the planting lift lever 33. The pin 91 provided at the apex of the fixed plate 90 also moves simultaneously. The potentiometer 93 rotates in conjunction with the movement of the pin 91 and outputs a detection result of the rotation angle to the control circuit 200. The control circuit 200 that has received the output signal from the potentiometer 93 has operated the planting lift lever 33 from the “down” position toward the “stop” position (or at a position corresponding to the stop) during the interlocking operation. And the interlocking operation by the servo motor 99, the motor arm 103, etc., which is an example of the interlocking stop mechanism of the present invention, is stopped. Specifically, the control circuit 200 uses the position of the first long hole 104 (see FIG. 14) of the planting spring 100 when the switching cam 74 is positioned at the “down” position (or “planting” position) as a reference. The first pin 102 of the motor arm 103 is located near the center of the long hole 104 (for example, the “standby position” shown in FIGS. 12 and 13 is the position where the first pin 102 exists). It is the structure which moves. This prevents the members such as the servo motor 99 and the motor arm 103 that are also examples of the turning interlock mechanism of the present invention from being damaged.

  Further, the control circuit 200 obtains an output signal from the rotation sensor 182 after outputting the “down command”, and determines that the traveling vehicle body 2 has traveled a predetermined distance. “Planting start command” is output.

  Upon receiving the “planting start command”, the servo motor 99 further rotates the motor arm 103 by a predetermined angle in the clockwise direction and forcibly pulls the planting spring 100 backward by the first pin 102, thereby switching the switching cam 74. This is a configuration that automatically moves to a position corresponding to “planting”. Thereby, the planting clutch (not shown) is switched to “ON”, and the planting operation by the planting claws 521 and the like of the planting device 52 is automatically started. In addition, as an example of the interlocking operation of the turning interlocking mechanism of the present invention, the above-described operation of automatically lowering the planting device 52 and then automatically starting the planting operation corresponds.

  When the servo motor 99 receives the “down command” and the “planting start command” from the control circuit 200, the pull wire 310 connected to the motor arm 103 moves the back lift arm 76 downward as described above. Therefore, the positioning roller 77 can easily get over the positioning groove 751 even if the torque of the servo motor 99 is set lower than the conventional one.

Next, operation | movement of the seedling transplanter 1 concerning this Embodiment is demonstrated.
A: Turning start operation The operator places the traveling vehicle body 2 in the forward direction with the speed change lever 36 (see FIG. 16), and while driving the field, planting the seedling in the field with the planting device 52 lowered. Go. In this working state, the planting lift lever 33 is set to the “planting” position as shown in FIG. Therefore, the switching cam 74 connected to the planting lift lever 33 is at the position shown in FIG. 15, that is, the position where the positioning roller 77 is in the fourth groove 751d.

  When reaching the end of the field, the operator rotates the steering member 34 (see the first point 411 in FIG. 17). As the steering member 34 rotates, the steering member shaft 35 rotates, and the T-shaped pitman arm 60 rotates about the rotation shaft 60b via the pinion mechanism. FIG. 17 is a schematic diagram showing a travel locus 400 in the field of the seedling transplanter 1, and 401 indicates the position of the transplanted seedling.

  By the rotation of the pitman arm 60, the two T-shaped tip portions 60a and 60a of the pitman arm 60 are rotated. As a result, the two tie rods rotatably attached to the front end portions 60a, 60a move, and the knuckle arms (not shown) of the left and right front wheel final cases 13, 13 to which the respective tie rods are attached. Rotate.

  Thus, by steering the steering member 34, the right and left front wheels 10 are rotated, and the turning of the traveling vehicle body 2 is started.

  At this time, along with the rotation of the pitman arm 60, the horizontal rod 62, which is rotatably attached to the cylindrical pin 61, also rotates and moves (see FIG. 4). As a result, since the tip 62a of the rod 62 moves, the connecting pin 63 fixed to the side surface and the arm 64 (64a, 64b, 64c) attached to the end of the connecting pin 63 are also pulled. (See FIG. 5).

  When the arm 64 (64a, 64b, 64c) moves, the autolift cable 71 connected to the upper end 64c1 of the upper portion 64c of the arm 64 is pulled (see FIG. 5).

  As a result, the cable end 72 (see FIGS. 6 and 8) of the autolift cable 71 is pulled downward, and the turning switching operation unit 73 connected to the cable end 72 moves downward.

  Here, it is assumed that the turning switching operation unit 73 is selected in the automatic switching mode. That is, as shown in FIGS. 6 and 8, it is assumed that the lock pin 731 fixed to the backlift arm 76 is fitted in the first hole 732 of the turning switching operation unit 73 (the operator manually turns this turning The switching operation unit 73 is moved left and right, and the lock pin 731 is inserted into or removed from the first hole 732).

  At that time, when the turning switching operation unit 73 moves downward, the backlift arm 76 also moves downward via the lock pin 731. When the backlift arm 76 moves downward, the positioning roller 77 fixed to the backlift arm 76 also moves downward. As a result, the positioning roller 77 is disengaged from the fourth groove 751d of the switching cam 74 that has been fitted so far.

  On the other hand, since the switching cam 74 is always urged forward (in the direction of arrow A in FIG. 8) by the spring 78 (see FIG. 3), the positioning cam 77 is free when the positioning roller 77 is disengaged from the fourth groove 751d of the switching cam. It becomes a structure which can move, and the switching cam 74 rotates counterclockwise around the axis | shaft 80 at a stretch. As a result, the planting lift lever 33 moves from the “planting” position to the “raised” position (see FIG. 12). Here, FIG. 12 is a side view centering on the switching cam 74 showing the raised state of the planting device 52 when the seedling transplanter 1 is turned.

  As a result, with the rotation of the switching cam 74, the planting clutch (not shown) is switched to the “cut” side via the wire, rod, arm, etc., and the planting operation by the planting device 52 is stopped, and the planting operation is stopped. The switching valve 461 that switches the oil path to the lifting hydraulic cylinder 46 of the attaching device 52 switches to the “up” side, and the planting device 52 moves upward.

  With the above configuration, when the operator cuts the steering member 34 at the end of the field (see the first point 411 in FIG. 17), the planting operation of the planting device 52 automatically stops and the planting device 52 rises. . This eliminates the need for the operator to operate the planting lift lever 33 one by one.

  An example of the automatic raising mechanism of the present invention corresponds to a configuration including the pitman arm 60, the backlift arm 76, the switching valve 461, and the like.

  Note that when the operator manually moves the turning switching operation unit 73 to the left and right and removes the lock pin 731 from the first hole 732, the turning switching operation unit 73 and the backlift arm 76 are removed even if the steering member 34 is cut. The positioning roller 77 does not move downward, and naturally the switching cam 74 does not move to the “up” position.

As described above, the turning switching operation unit 73 of the present embodiment can arbitrarily select the automatic interlocking on / off of the steering member 34 and the raising of the planting device 52.
B: Operation at the end of turning Next, when the traveling vehicle body 2 is further turned, the planting device 52 is automatically lowered. That is, as shown in FIG. 11, since the rotation sensor 182 detects the rotation speeds of the pair of left and right rear wheels 11, 11, the control circuit 200 to which the detected rotation speed signal is input has both rotation speeds. When it is determined that the difference is equal to or less than the preset rotation speed (second point 412 in FIG. 17), a drive signal as a “down command” is output to the servo motor 99.

  The servo motor 99 receives the drive signal, and moves the switching cam 74 from the ascending state shown in FIG. 12 as shown in FIGS.

  That is, since the planting device 52 exists in the raised position during turning, the planting lift lever 33 is in the “up” position, and the positioning roller 77 is in the first groove 751a ( (See FIG. 12). On the other hand, the servo motor 99 rotates the motor arm 103 in advance and causes the first pin 102 to wait in advance at a standby position in preparation for a command from the control circuit 200 (see FIG. 12).

  Therefore, the servo motor 99 rotates the motor arm rotation shaft 101 in the clockwise direction. Thereby, the motor arm 103 is also rotated in the clockwise direction.

  As a result, the second pin 300 standing on the motor arm 103 pulls the pulling wire 310 connected to the backlift arm 76, and the first pin 102 standing on the motor arm 103 is switched to the switching cam. Since the planting spring 100 connected to 74 is pulled rearward (leftward in FIG. 12), the switching cam 74 rotates clockwise with a relatively weak force.

  That is, the positioning roller 77 in the first groove 751a is urged upward by a spring, but the second pin 300 standing on the motor arm 103 is moved by the rotation of the servo motor 99 so that the back lift arm Since the pulling wire 310 connected to 76 is pulled, the positioning roller 77 moves downward, and the urging force is relaxed. Then, when the rotational force by the servo motor 99 opposes the above-described relaxed urging force, the switching cam 74 is forcibly rotated and the positioning roller 77 sequentially gets over the positioning groove 751. Accordingly, as shown in FIG. 14, the switching cam 74 and the planting lift lever 33 rotate to the “down” position.

  13 is a side view centering on a switching cam 74 showing a fixed (stopped) state of the planting device 52 in the seedling transplanter 1, and FIG. 14 is a switching showing a lowered state of the planting device 52. FIG. 6 is a side view centered on a cam 74.

  Thereafter, the servo motor 99 receives the drive signal as the “planting start command” from the control circuit 200 and further rotates the motor arm rotation shaft 101 in the clockwise direction. Therefore, from the third point 413 in FIG. The planting claw 521 provided in the planting device 52 starts to rotate and the planting of the seedling starts. Thereby, the planting start position of the seedling after completion | finish of turning corresponds with the planting end position of an adjacent strip.

  That is, the control circuit 200 outputs the “down command” at the second point 412 (see FIG. 17), obtains an output signal from the rotation sensor 182, and determines that the traveling vehicle body 2 has traveled a predetermined distance. At the three points 413 (see FIG. 17), a “planting start command” is output to the servo motor 99. As a result, the motor arm 103 further rotates clockwise by a predetermined angle and the planting spring 100 is forcibly pulled backward by the first pin 102, so that the switching cam 74 automatically moves to the “planting” position. Then, a planting clutch (not shown) is inserted and the planting operation by the planting device 52 is started. Also at this time, since the pull wire 310 connected to the motor arm 103 pulls the back lift arm 76 downward, the upward biasing force when the positioning roller 77 moves from the third groove 751c to the fourth groove 751d is alleviated. .

  When the switching cam 74 completes the movement to the “planting” position shown in FIG. 15, the control circuit 200 receiving the output signal from the potentiometer 93 prepares for the next interlocking operation with respect to the servo motor 99. In order to make the first pin 102 wait in advance to the “standby position” described above, a “standby command” is issued. Upon receiving the “standby command”, the servo motor 99 rotates counterclockwise by a predetermined angle to move the first pin 102 to the “standby position”. At this time, since the first pin 102 only moves along the range of the opening of the first long hole 104 of the planting spring 100, the switching cam 74 is forcibly rotated via the planting spring 100. There is no.

Here, as an example of the next interlocking operation of the present invention, when the operator turns the handle at the next turning place, the planting device automatically rises in conjunction with the turning operation, After that, a series of operations that automatically descends and automatically enter the planting operation correspond.
C: Stop of interlocking operation (C-1): Stop of descending operation of planting device Next, from the point where planting device 52 of traveling vehicle body 2 starts to descend (see second point 412 in FIG. 17), planting A case will be described in which the operator forcibly moves the planting lift lever 33 to the “up” position between the points where the operation is started (see the third point 413 in FIG. 17).

  At this time, the first pin 102, the planting spring 100, the meter arm 92, the switching cam 74, and the like are at positions corresponding to “down” as shown in FIG. That is, the servo motor 99 stops rotating at this “down” position, but since holding torque is generated, the first pin 102 is positioned and held at the current position by the action of the holding torque. ing.

  Accordingly, when the operator starts to forcibly move the planting lift lever 33 in the “up” direction, first, the compression spring 100a of the planting spring 100 is extended, so that the first pin 102 is moved from its position by the action of the holding torque. Although it does not move, the switching cam 74 starts to rotate counterclockwise about the shaft 80. In this manner, the planting lift lever 33 moved to the “down” position (or moved in the “down” direction) by the force against the holding torque (or rotational torque) of the servo motor 99 is set. Since the force is absorbed when the compression spring 100a is extended when it is forced to move in the “up” direction, the servo motor 99, the motor arm rotating shaft 101, the motor arm 103, the first pin 102, and the planting spring Since no overload is applied to 100, the planting lift lever 33, etc., these members can be prevented from being damaged.

  On the other hand, the potentiometer 93 detects the rotation of the switching cam 74 in the counterclockwise direction and sends a detection signal to the control circuit 200. Upon receiving the detection signal, the control circuit 200 determines that the planting lift lever 33 is operated from the “down” position toward the “stop” position during the interlock operation, and performs “interlock stop” to the servo motor 99. A drive signal as a “command” is output. Then, the servo motor 99 that has received the “interlocking stop command” rotates the motor arm 103 counterclockwise by a predetermined angle, so that the first pin 102 immediately becomes the “standby position” (FIGS. 12 and 13). To the position of the first pin 102 shown in FIG.

  As a result, the first pin 102 in the standby position comes into contact with the inner edge portion 104a (see FIG. 10A) at the rear end of the first long hole 104 of the planting spring 100, and the holding torque is forward of the planting spring 100. Since it does not act to prevent the movement in the direction (right direction in FIG. 10A), the extension of the compression spring 100a is canceled, and the operator can plant the lifting lever with the same level of force as the normal operation. 33 can be moved toward the “up” position. When the switching cam 74 moves to the “stop” position, as described above, the switching valve 461 (see FIG. 1) is closed via the wire, rod, arm, etc., and the operation of the elevating hydraulic cylinder 46 is stopped. By doing so, the descending operation of the planting device 52 is stopped.

  Therefore, when the turning of the traveling vehicle body 2 is almost completed and the planting device 52 is descending, for example, an operator who notices that the unfolding direction of the drawing marker (not shown) is reverse is immediately planted. The elevating lever 33 can be moved to the “up” position, and as a result, the interlocking operation can be stopped without waiting until the descending operation or the planting / inserting operation (interlocking operation) of the planting device 52 is completed. I can do it.

  Even at this time, components such as the servo motor 99, the motor arm rotation shaft 101, the motor arm 103, the first pin 102, the planting spring 100, and the planting lift lever 33 are not overloaded. Can be prevented from being damaged.

  Note that the movement destination of the first pin 102 is not limited to the “standby position” described above. For example, when the planting lift lever 33 is moving toward the “up” position and the movement to the “up” position is completed. (See FIG. 12), the inner edge 104a of the rear end of the first elongated hole 104 is in a position where the first pin 102 does not need to be pulled forward against the holding force and is planted. When the elevating lever 33 moves to the “planting” position (see FIG. 15), the inner edge 104 b at the front end of the first long hole 104 pushes the first pin 102 backward against the holding force. As long as the position is not necessary (referred to as “interlocking stop position”), the position is not necessarily the same as the “standby position”. Of course, the “standby position” satisfies the requirement of the “interlocking stop position”.

  Next, the operator moves the planting lifting / lowering lever 33 from the “up” position to the “down” position, so that the unfolding direction of the drawing marker is appropriately operated. At this time, since the first pin 102 of the motor arm 103 has already been moved to the “standby position”, the interlocking operation is stopped and does not re-activate, so the position is limited to the position of the first pin 102. The operator can manually move the planting lift lever 33 to the “down” position at an appropriate timing.

  Further, the operator can manually move the planting lift lever 33 to the “planting” position at an appropriate timing without being limited to the position of the first pin 102.

  Thereby, it is not necessary to wait for the operation of the planting lift lever 33 until the interlocking operation of the turning interlock mechanism is stopped, and the planting start position (see the third point 413 in FIG. 17) can be aligned. Efficiency improves and seedling planting accuracy improves.

(C-2): Stop planting operation of planting device After the descending operation of planting device 52 is completed and work vehicle body 2 travels a predetermined distance, planting operation by planting device 52 is performed at third point 413. When the interlocking operation needs to be stopped at the time of starting, the operator moves the planting lift lever 33 from the “planting” position to the “up” position. Since it is basically the same as the operation at the time of “stopping the descent operation of the planting device” described in C-1), the description thereof is omitted.

  Even at this time, as described above, there is no need to wait for the operation of the planting lift lever 33 until the interlocking operation of the turning interlock mechanism is stopped, and the planting start position of the seedling can be aligned, so that the work efficiency is improved, Improves seedling planting accuracy.

  Next, in the seedling transplanter 1 of the present embodiment, the second turning switching operation unit 173 capable of adjusting the operation timing of the auto lift function of the planting device 52 during turning will be described with reference to FIG. . Here, FIG. 18 is a schematic side view illustrating the second turning switching operation unit 173. In the figure, the same reference numerals are given to the same components as those in the above embodiment.

  As shown in FIG. 18, the second turning switching operation unit 173 includes a second hole 732 a above the first hole 732 in addition to the first hole 732 described in the above embodiment. In order to provide the second hole 732a, the upper part of the first hole 732 protrudes compared to the outer shape of the turning switching operation unit 73 described in the above embodiment (see FIG. 6). The first hole 732 is a hole for standard operation of the auto lift function of the planting device 52 at the time of turning, and the second hole 732a is used when the planting device 52 wants to be raised slightly later than the standard. This is a delay hole.

  That is, when the operator manually moves the second turning switching operation portion 173 to the left and right to fit the second hole 732a to the lock pin 731 standing on the backlift arm 76, the autolift cable 71 is Since the auto-lift cable 71 is pulled downward by rotating the steering member 34 because the steering member 34 is rotated, the cable end portion 72 pushes the second turning switching operation portion 173 and the support shaft 79 by the amount of the looseness. The timing of turning downward as the center is delayed.

  When the second hole 732a is used, a shape in which a lower end edge portion 174 of the second turning switching operation portion 173 is provided with a relief portion that does not interfere with the cable outer 174 holding the autolift cable 71 is provided. It is configured.

  Next, with reference to FIG. 19, the backlift arm 76 and the turn switching operation unit 73 (see FIG. 8) described in the above embodiment are abolished, and the cable end 72 is replaced with the tip 83 a of the bar 83. A directly connected configuration will be described. Here, FIG. 19 is a schematic perspective view of a configuration in which the cable end portion 72 is directly connected to the tip end portion 83 a of the bar 83. In the figure, the same reference numerals are given to the same components as those in the above embodiment.

  According to the configuration of FIG. 19, when the end portion 83a of the bar 83 is positioned in the horizontally long portion of the L-shaped cutout hole 84, when the cable end portion 72 connected to the end portion 83a is pulled downward, Since the bar 83 rotates about the bar rotation shaft 83b in the direction of arrow L (see FIG. 19), the backlift on / off lever 82 is pushed by the tip 83a of the bar 83 and moves downward. As described above, since the back lift on / off lever 82 is connected to the positioning roller 77, the positioning roller 77 moves downward.

  According to this configuration, even if the backlift arm 76 and the turning switching operation unit 73 (see FIG. 8) are eliminated, the same function is exhibited.

  Next, in the seedling transplanter 1 of the present embodiment, referring to FIG. 9, even when the servo motor 99 fails and does not move, the connection between the servo motor 99 and the switching cam 74 can be released. The configuration will be described.

  That is, in the conventional seedling transplanter, at the end of turning, the servo motor 99 that automatically moves the planting lift lever 33 stops at the “down” position or the “planting” position due to a trouble in the electrical system or the like. The planting device 52 cannot be raised, so that seedling planting work cannot be performed, and the planting device 52 is in contact with the field, so that the planting device 52 is not damaged. You have to travel and spend a lot of time getting out of the field.

  Therefore, the first pin 102 shown in FIG. 9 is made detachable from the motor arm 103, and the connection with the planting spring 100 can be released by removing the first pin 102.

  Further, the planting spring 100 released from the connection with the motor arm 103 is rotated clockwise about the third pin 105 by the operator, and the back side near the lower side of the shaft 80 of the switching cam 74 (FIG. 9). Is hooked on the inner edge 104a (see FIG. 10 (a)) of the rear end of the first long hole 104 to a retracting pin (not shown) standing from the rear side of the first elongated hole 104 toward the rear side in the drawing. Thus, the structure can be held at that position.

  As a result, even when the servo motor 99 stops at the “down” position or the “planting” position at the end of turning due to a trouble with the electrical system or the like, the operator can easily connect the servo motor 99 with the servo motor 99. The connection with the switching cam 74 can be released, and the planting device 52 can be raised to travel.

  Next, in the seedling transplanting machine 1 of the present embodiment, a configuration of an inter-strain lever for adjusting between planted strains will be described with reference to FIGS. 20 (a) and 20 (b).

  Here, FIG. 20 (a) is a schematic plan view showing the configuration of the inter-strain lever 500 of the seedling transplanter 1, and FIG. 20 (b) is a side view of the inter-strain lever 500 seen from the direction F of FIG. 20 (a). It is. In FIG. 20A, the direction indicated by the arrow H is the front portion of the traveling vehicle body 2.

  As shown in FIGS. 20 (a) and 20 (b), the inter-stock lever 500 is a substantially U-shaped rod-shaped member, and is composed of a gripping part 500a, an inter-stock lever fulcrum part 500b, and a lever tip part 500c. Yes. In addition, the inter-stock lever 500 is rotatably supported in the range indicated by the arrow G by a frame fulcrum part 510a provided on one end side of the inter-stock lever support frame 510 in the inter-stock lever fulcrum part 500b. Further, the lower end portion of the auxiliary transmission lever 520 is fixed to the auxiliary transmission lever fulcrum 510b provided on the other end side of the inter-stock lever support frame 510. The inter-stock lever support frame 510 is fixed to the mission case 12 at the central portion 510d.

  Moreover, the lever front-end | tip part 500c is fitted in the arm long hole 540a provided in the inter-stock arm 540 so that rotation and sliding are possible. The stock-to-stock arm 540 protrudes from the mission case 12 in the vertical direction, and is fixed to the stock-to-stock arm fulcrum 541 that is rotatably supported.

  With the above configuration, the inter-stock lever support frame 510 is fixed to the transmission case 12 at the central portion 510d that is extremely close to both the auxiliary transmission lever fulcrum portion 510b and the frame fulcrum portion 510a. However, rigidity can be secured with a simple configuration.

  Further, according to the above configuration, the substantially U-shaped space sandwiched between the rising portion 510c on one end side of the inter-lever lever support frame 510 and the auxiliary transmission lever fulcrum portion 510b on the other end side is formed in the floor step 37. It can be secured as the first space 530 for the main harness routing.

  Further, according to the above configuration, the frame fulcrum portion 510a and the inter-arm arm fulcrum portion 541 are arranged obliquely with respect to the front-rear direction of the traveling vehicle body 2 (see the arrow H in FIG. 20A). The fulcrum portion 510a is moved as far as possible in front of the traveling vehicle body 2 (see arrow H in FIG. 20A), and does not hinder the assembly of the floor step 37.

  Further, in the operation direction of the inter-arm 540 (see the arrow I in FIG. 20A), the operation is decentered from the center of the traveling vehicle body 2 so that the inter-arm operation direction (see the arrow I in FIG. 20A). ) And secure the space on the opposite side. That is, this space is utilized as the second space 550 for harness routing, and the interference between the harness and the stock arm 540 is prevented.

  Further, by making the inter-stock lever 500 into a substantially square shape in a side view, the distance from the inter-stock lever fulcrum part 500b to the gripping part 500a and the length of the inter-stock arm 540 from the inter-stock lever fulcrum part 500b are extended as much as possible. The operation load of the inter-stock lever 500 can be reduced.

  In the above-described embodiment, the configuration in which the first pin 102 moves to the “standby position” or the “interlocking stop position” when the interlocking operation is stopped has been described. As long as the planting spring 100 as an example of the spring spring member has the configuration having the compression spring 100a and the first elongated hole 104 as described above (see FIG. 10A), the servo motor 99 remains stopped. A configuration may be adopted in which a predetermined holding torque is generated so that the first pin 102 stays at the “down” or “planting” position (see the position of the first pin 102 in FIGS. 9 and 15). That is, according to this configuration, the control circuit 200 does not output the “interlocking stop command” described above to the servo motor 99.

  Therefore, according to this configuration, the operator forcibly moves the planting lift lever 33 between the second point 412 where the planting device 52 starts descending and the third point 413 (see FIG. 17) where the planting operation starts. The first pin 102 does not move from the position due to the action of the holding torque, but when the compression spring 100a of the planting spring 100 is extended, the switching cam 74 is moved to the shaft 80. Rotation in the counterclockwise direction is started around the center, and the descending operation (interlocking operation) of the planting device 52 is stopped. Therefore, the interlocking operation can be stopped without waiting for the descent operation or the planting / insertion operation (interlocking operation) of the planting device 52 to be completed.

  At this time, the compression spring 100a is extended, so that the servo motor 99, the motor arm rotation shaft 101, the motor arm 103, the first pin 102, the planting spring 100, the planting lift lever 33, and the like are not overloaded. Therefore, these members can be prevented from being damaged. In this configuration, the compression spring 100a is an example of the interlock stop mechanism of the present invention.

  Moreover, although the said embodiment demonstrated the structure provided with the planting spring 100 which has the compression spring 100a, it is not restricted to this, For example, the plate-shaped planting arm which has the same long hole as the past (FIG. 1 of patent document 1) 9 (see reference numeral 100 in FIG. 9).

  Specifically, for example, the servo motor 99 is rotating clockwise between the second point 412 where the planting device 52 starts descending and the third point 413 where the planting operation starts (see FIG. 17). If there is, the control circuit 200 determines from the output signal from the potentiometer 93 that the operator has forcibly moved the planting lift lever 33 in the “up” direction against the drive torque of the servo motor 99. Then, the “interlocking stop command” is output to the servo motor 99, and the first pin 102 is moved to the “standby position” or the “interlocking stop position”.

  That is, the control circuit 200 causes a change such as a temporary stop of the rotation of the motor arm 103 or a decrease in the rate of change of the rotation angle by the output signal from the potentiometer 93. By detecting this, it is determined that the planting lift lever 33 has been operated from the position corresponding to “down” or “planting” toward the position corresponding to “stop”, and the servo motor 99 is given a “linked stop command. Is output.

  The control circuit 200 is also used when the operator attempts to move the planting lift lever 33 in the “up” direction against the holding torque of the servomotor 99 while the planting device 52 is moving down. Detects a change in the output signal from the potentiometer 93 and outputs an “interlocking stop command” in the same manner as described above.

  As a result, when the worker starts to move the planting lift lever 33 in the “up” direction, a force against the torque of the servo motor 99 is required. In response to the command, the servo motor 99 rotates counterclockwise and the first pin 102 moves to the “standby position” or the “interlocking stop position”. Movement in the direction "" is possible. Then, when moving to the “stop” position, the descent operation of the planting device 52 is stopped. Therefore, the interlocking operation can be stopped without waiting until the descending operation and the planting operation (interlocking operation) of the planting device 52 are completed, and the first pin 102 is set to “standby position” or “interlocking”. Since it has moved to the “stop position”, the interlocking operation does not re-activate.

  In addition, since components such as the servo motor 99, the motor arm rotation shaft 101, the motor arm 103, the first pin 102, the planting spring 100, and the planting lift lever 33 are not overloaded, these members are damaged. Can be prevented.

  In the above configuration, the pull wire 310 may not be provided. According to this configuration, the servo motor 99 exhibits the same effect as described above except that the same torque as that of the conventional motor is required.

  Moreover, in the said embodiment, when the control circuit 200 determines from the detection result of the potentiometer 93 that the planting elevating lever 33 has been operated in the direction opposite to the above-mentioned interlocking operation, the configuration that stops the interlocking operation is described. However, not limited to this, for example, the control circuit 200 detects an angle change over a predetermined time (for example, 15 to 20 seconds) from the detection result of the potentiometer 93 which is an example of the rotation angle detection device of the present invention. When the rear wheel is determined to be stopped for a predetermined time (for example, 3 to 5 seconds) from the detection result of the rotation sensor 182 as an example of the rotation speed detection device of the present invention, the control circuit In response to the “interlocking stop command” output from 200 to the servomotor 99, the servomotor 99, which is an example of the interlocking stop mechanism of the present invention, Arm 102 or the like, it may be configured to stop their interlocking operation.

  Moreover, according to this structure, it is not restricted to the structure provided with the planting spring 100 which has the compression spring 100a demonstrated in the said embodiment, For example, the plate-shaped planting arm which has the same long hole as the past (patent document 1) (See reference numeral 100 in FIG. 9).

  According to the above configuration, for example, the operator moves the drawing marker in the direction of deployment between the second point 412 where the planting device 52 starts descending and the third point 413 (see FIG. 17) where the planting operation starts. In order to switch between them, it is assumed that the traveling vehicle body 2 is stopped by moving the shift lever 36 (see FIG. 16) to the “stop position”. Thereby, the rotation speed of the rear wheel is stopped for a certain time (for example, 3 to 5 seconds), and the planting lift lever 33 is held at the “down” position for a certain time (for example, 15 to 20 seconds). Then, the control circuit 200 obtains output signals indicating such a situation from the rotation sensor 182 and the potentiometer 93, determines that some trouble has occurred in the seedling transplanter 1, and controls the servo motor 99. Outputs "Interlock stop command". The servomotor 99 rotates counterclockwise by the “interlocking stop command” from the control circuit 200, and the first pin 102 moves to the “standby position” or “interlocking stop position”. It is possible to move in the “up” direction with the same force as the operation of. Then, when moving to the “stop” position, the lowering operation and the planting operation of the planting device 52 are stopped. Therefore, the interlocking operation can be stopped without waiting until the interlocking operation is completed, and the first pin 102 is moved to the “standby position” or the “interlocking stop position”. There is no reactivation.

  In addition, since components such as the servo motor 99, the motor arm rotation shaft 101, the motor arm 103, the first pin 102, the planting spring 100, and the planting lift lever 33 are not overloaded, these members are damaged. Can be prevented.

  Alternatively, when the seedling transplanter 1 is stopped at the end of the field in the middle of turning, it is determined that replenishment work such as seedling and fertilizer is performed, and a “linked stop command” is output to the servo motor 99. The operation of the planting elevating lever 33 is not restricted during the seedling or fertilizer replenishment operation. Thereby, the planting device 52 is raised so that the seedling replenishment work can be easily performed, or the planting device 52 is lowered so that the fertilizer can be easily replenished with the fertilizer application device 5. The efficiency can be improved, and the working height of the planting device 52 can be adjusted before resuming the turning after the replenishment work, so that the descent start position and the planting start position of the planting device 52 change. This improves the accuracy of seedling planting.

  In the above-described embodiment, for example, the operator moves the servo motor 99 between the second point 412 where the planting device 52 starts descending and the third point 413 where the planting operation starts (see FIG. 17). The control circuit 200 determines from the output signal from the potentiometer 93 that the plant raising / lowering lever 33 has been forced to move in the “up” direction against the torque, and the servo motor 99 is given an “interlocking stop command”. However, the present invention is not limited to this. For example, the control circuit 200 that has made the above determination uses (1) the first pin 102 as an example of the connecting member of the present invention, and a long hole similar to the conventional one. The longitudinal direction of the long hole of the plate-shaped planting arm (see reference numeral 100 in FIG. 9 of Patent Document 1), or the first planting spring 100 described above as another example. For example, the servo motor 99 is rotated along the longitudinal direction of the hole 104 so that the servo motor 99 is moved to the “interlocking stop position” (or the “standby position” where the servomotor 99 waits in advance for the next interlocking operation). Or (2) the holding torque of the servo motor 99 for moving and holding the switching cam 74 to the position corresponding to “down” or “planting” is linked to the servo motor 99 next The configuration may be such that the holding torque of the servo motor 99 is lowered at a “standby position” that is in advance waiting for operation.

  According to the above configuration, for example, the servomotor for holding the motor arm 103 after moving it to a position corresponding to “down” or “planting” in accordance with an output signal from the control circuit 200. Since the holding torque 99 is set lower than the holding torque at the “standby position”, the operator can operate the motor arm 103 connected to the servo motor 99 with a relatively light force in the manual operation of the planting lift lever 33. It can be moved easily. Therefore, even when the turning interlock mechanism of the present invention composed of the servo motor 99 or the like is in operation, the planting lift lever 33 can be operated to freely raise and lower the planting device 52 and turn on and off the planting operation. The work efficiency is improved, and the seedling planting accuracy is improved.

  In the above-described embodiment, the configuration including the pulling wire 310 illustrated in FIG. 10A has been described. However, the configuration is not limited thereto. For example, the fourth pin 320 of the pulling wire 310 is on the backlift arm 76. It may be configured to be connected to another position, or may be configured to be connected to the positioning roller 77. In short, the servo motor 99 rotates the motor arm rotation shaft 101 in the clockwise direction, and the switching cam 74 is moved. Any mechanism may be used as long as the torque for moving to the “down” or “planting” position can be reduced.

  In the above-described embodiment, the configuration in which the “interlocking stop command” is output to the servo motor 99 based on the predetermined determination of the control circuit 200 has been described. However, the configuration is not limited thereto. When it is determined that the traveling vehicle body 2 is turning, the holding torque of the servo motor 99 during turning is made to wait in advance at the first pin 102 at the “standby position”. It may be configured to control so as to be lower than the holding torque.

  According to the above configuration, for example, the servomotor for holding the motor arm 103 after moving it to a position corresponding to “down” or “planting” in accordance with an output signal from the control circuit 200. Since the holding torque 99 is set lower than the holding torque at the “standby position”, the operator can operate the motor arm 103 connected to the servo motor 99 with a relatively light force in the manual operation of the planting lift lever 33. It can be moved easily. Therefore, even when the turning interlock mechanism of the present invention composed of the servo motor 99 or the like is in operation, the planting lift lever 33 can be operated to freely raise and lower the planting device 52 and turn on and off the planting operation. The work efficiency is improved, and the seedling planting accuracy is improved.

  In the above embodiment, the configuration using the servo motor as an example of the rotation device of the present invention has been described. However, the configuration is not limited to this, and for example, a step motor may be used. Even if the step motor is used, the potentiometer 93 can accurately detect the position of the switching cam 74, so that the control circuit 200 uses the detection result of the potentiometer 93 to control the rotation angle of the step motor. I can do it. Therefore, even with this configuration, the same effects as in the above embodiment are exhibited.

  Further, the intermediate mechanism and the automatic lifting mechanism of the present invention are not limited to this embodiment, and other mechanisms may be used as long as they have a mechanical structure.

  ADVANTAGE OF THE INVENTION According to this invention, at the time of turning, the operator can provide the seedling transplanting machine which can operate a work operation lever to the "rise" side, and is useful as a seedling transplanting machine.

DESCRIPTION OF SYMBOLS 1 Seedling transplanter 2 Traveling vehicle body 3 Lifting link device 10 Front wheel 11 Rear wheel 12 Mission case 15 Main frame 18 Rear wheel gear case 33 Planting lift lever 34 Steering member 36 Shift lever 46 Lifting hydraulic cylinder 52 Planting device 60 Pitman arm 62 Rod 64 Arm 70 Front frame 73 Rotation switching operation unit 74 Switching cam 76 Back lift arm 77 Positioning roller 79 Support shaft 80 Axis 82 Back lift on / off lever 83 Bar 99 Servo motor 100 Planting spring 181 Rear wheel vertical movement fulcrum shaft 182 Rotation sensor 200 Control Circuit 310 Pulling wire 461 Switching valve 751 Positioning groove

Claims (3)

A steering member (34) for operating the traveling direction of the traveling vehicle body (2), a planting device (52) for planting seedlings provided on the rear side of the traveling vehicle body (2), raising and lowering of the planting device (52), and A work operation lever (33) for performing a planting operation and a swing for lowering the planting device (52) in conjunction with a turning operation of the steering member (34) and starting planting by the planting device (52). In a seedling transplanter equipped with an interlocking mechanism,
A control circuit (200) for lowering the planting device (52) in conjunction with the pivot interlocking mechanism or starting planting;
A detection device (93) for detecting the raising and lowering of the planting device (52) and the start operation and the cutting operation of the planting operation is provided,
The control circuit (200) stopped the seedling transplanter for a predetermined time or more during the turning after the detection device (93) detected the raising of the planting device (52) and the cutting operation of the planting operation . When the operation is not detected in the state, the turning interlocking by the turning interlocking mechanism is stopped ,
A switching cam (74) that rotates to a position corresponding to the operation of raising and lowering the planting device (52) and planting operation in conjunction with the operation of the work operation lever (33) or the turning interlocking mechanism is provided, and the detection The device (93) detects the rotation angle of the switching cam (74),
A rotating device (99) for rotating the switching cam (74);
The detection device (93) detects that the work operation lever (33) is operated in a direction to raise or stop the planting device (52) from a position corresponding to lowering or planting during the turning interlock. Upon detection, the turning device (99) stops the turning interlock,
A first connecting member (102) is provided on a rotating arm (103) that is rotated by the operation of the rotating device (99), and the first connecting member (102) and the switching cam (74) are connected to a spring member (100). And a long hole for connection (104) is formed in the spring member (100), and the first connection member (102) is arranged to be movable along the longitudinal direction of the long hole (104). A seedling transplanting machine characterized by comprising an interlocking stop mechanism . The detection device (93) detects that the work operation lever (33) is operated in a direction to raise or stop the planting device (52) from a position corresponding to lowering or planting during the turning interlock. When detected
The rotating device (99) is rotated so that the first connecting member (102) is moved along the longitudinal direction of the elongated hole (104), or the switching cam (74) is moved to a work operation lever ( The seedling transplanting machine according to claim 1, wherein a holding torque of the rotating device (99) held at the operation position of 33) is reduced . A switching auxiliary arm (76) for raising the planting device (52) by a turning operation of the steering member (34);
The switching auxiliary arm (76) is fitted in a state where it is biased into a plurality of recesses (751a, 751b, 751c, 751d) of a notch (75) formed in the switching cam (74). The positioning roller (77) for positioning the rotation of the cam (74) is rotatably held, and the switching auxiliary arm (76) and the rotation arm (103) are connected by a pull wire (310). And
By the rotation of the rotation arm (103) by the rotation drive of the rotation device (99), the switching cam (74) is rotated from the ascending or stopping position of the planting device (52) toward the descending position. When this is done, the pull wire (310) pulls the switching auxiliary arm (76) in a direction that relaxes the biasing state of the positioning roller (77), and the switching cam (74) is a planting device. The pulling wire (310) is loosened and the urging state of the positioning roller (77) is maintained when it is rotated from the lowered position to the stopped or raised position in (52). The seedling transplanter according to claim 1 or 2.

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