JP2013027316A - Seedling transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seedling transplanter allowing continuous operation of a line drawing marker on one side, and prevention of contact of the line drawing marker with seedlings planted in a levee or a field during operation at the levee side.SOLUTION: There is disclosed the seedling transplanter composed by installing a levee side detecting member 76 for detecting planting operation at the levee side so as not to change over the operative direction of the line drawing marker 68 of a marker changeover device 72 even in the case of lifting and lowering a seedling planting part 4 when the levee side detecting member 76 detects the planting operation at the levee side, and composed by installing an operation frequency detecting member 77 for memorizing the lifting and lowering frequency of the line drawing marker 68 when the levee side detecting member 76 detects the planting operation at the levee side so as not to change over the operative direction of the marker changeover device 72 even in the case of lifting and lowering the seedling planting part 4 when the detection frequency of the operation frequency detecting member 77 is below a prescribed frequency. Furthermore, the seedling transplanter is composed so as to stop the operation of the marker changeover device 72 so that the line drawing marker 68 does not form a line in the field when the detection frequency of the operation frequency detecting member 77 becomes a prescribed frequency or above.

Description

  The present invention relates to a seedling transplanter for transplanting seedlings in a paddy field.

  In the conventional seedling transplanter, the left and right line drawing markers that form a line that is a standard for straight advancement in the field are automatically moved upward in conjunction with the raising and lowering of the seedling planting part at the start of turning, and after the end of turning There is a technique for automatically lowering the drawing marker on the side opposite to that before the turn in conjunction with the descent of the seedling planting part and forming a line at the next work position simultaneously with planting the seedling. (Patent Document 1)

JP 2010-246409 A

  However, the seedling transplanter described in Patent Document 1 raises the seedling planting part when turning at the corner of the field, and when the seedling planting part is lowered after turning, the line drawing marker descends and comes into contact with the heel. However, there is a problem that the drawing marker is damaged by the impact of contact.

  Also, when planting seedlings at the edge of the field, if the drawing marker on the side where the seedlings are already planted descends and the drawing marker crushes the seedlings, the operator pulls out the collapsed seedlings and manually operates the new seedlings Therefore, there is a problem that the work to be replanted becomes necessary, the work efficiency is lowered, and the labor of the worker is increased.

  In order to solve the above problems, the line drawing marker can be turned off automatically when planting near the end of the field, but in a wide field, the direction of travel is likely to be disrupted if there is no straight line as a guideline. The seedling planting lines meander or bevel, making it impossible to effectively use the entire field, resulting in a decrease in crop yield.

Although an operator can plant seedlings manually in a place where planting is not performed, there is a problem that the labor of the operator is greatly increased.
The present invention seeks to solve this problem.

  According to the first aspect of the present invention, a seedling planting part (4) for planting seedlings in a farm field is provided at the rear part of the traveling vehicle body (2) so as to be movable up and down, and a straight traveling indicator is provided on the side of the seedling planting part (4). A marker switching device (72) for switching the operation direction of the drawing marker (68) alternately in conjunction with the raising and lowering of the seedling planting part (4). In the provided seedling transplanting machine, a ridge detection member (76) for detecting a planting operation at the heel is provided, and when the ridge detection member (76) detects a planting operation at the heel, the seedling planting is performed. The seedling transplanting machine is characterized in that the operation direction of the drawing marker (68) of the marker switching device (72) is not switched even when the attachment (4) is moved up and down.

  The invention according to claim 2 is provided with an operation number detection member (77) for storing the number of times the drawing marker (68) is moved up and down when the edge detection member (76) detects a planting operation at the edge. When the number of detection times of the frequency detection member (77) is less than a predetermined number, the operation direction of the marker switching device (72) is not switched even if the seedling planting part (4) is moved up and down, and the operation frequency detection member The operation of the marker switching device (72) is stopped so that the line drawing marker (68) does not form a line on the field when the number of detections of (77) exceeds a predetermined number. A seedling transplanter.

  According to a third aspect of the present invention, a traveling device (11) is provided in the traveling vehicle body (2), a traveling rotation detecting device (78) for detecting the rotational speed of the traveling device (11) is provided, and the traveling rotation detecting device is provided. Until the rotation speed detected by (78) reaches a predetermined number of times or more after the start of the planting operation, the marker switching device (76) even if the planting detection member (76) detects the planting operation at the planting. 72) The seedling transplanter according to claim 1 or 2, wherein the operation direction of 72) is alternately switched.

  According to a fourth aspect of the present invention, a light emitter (76a) is provided on the edge detection member (76), and when the traveling rotation detector (78) detects a rotation more than a predetermined number of times, the light emitter (76a) The seedling transplanter according to claim 3, wherein the seedling transplanter is configured to emit light.

  The invention according to claim 5 is directed to a work operation member (80) for operating the seedling planting part (4), when the seedling planting part (4) is raised above a predetermined height. The seedling transplanter according to any one of claims 1 to 4, further comprising an adjustment lowering member (81) for automatically lowering the attachment portion (4) by a predetermined distance.

  According to a sixth aspect of the present invention, the leaning detection member (76) is constituted by a switch, and the traveling vehicle body (2) is provided with an inclination detection member (79) for detecting an inclination, and the inclination detection member (79) The seedling transplanter according to any one of claims 1 to 5, wherein when the inclination of a predetermined angle or more is detected, the edge detection member (76) is automatically "cut". It was.

  According to the first aspect of the present invention, when the cocoon detection member (76) detects the planting operation at the cocoon, even if the seedling planting portion (4) is moved up and down, the line drawing marker of the marker switching member (72) is drawn. Since the operation direction of (68) is not switched, the side on which the line drawing marker (68) forms a line on the field is kept on one side or the other side of the body, so The drawing marker (68) is prevented from descending and coming into contact with the heel, and the drawing marker (68) is prevented from being damaged.

  In addition, when planting seedlings on the adjacent strips at the heel, the drawing marker (68) can be prevented from descending to the side where the seedling has already been planted, so that the drawing marker (68) can crush the seedling. This eliminates the need for the operator to pull out the crushed seedlings and replant them into new seedlings, reducing the labor of the operator and reducing the number of wasted seedlings.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the number of times of raising / lowering the drawing marker (68) is stored in the operation number detecting member (77), and the number of times of raising / lowering is less than a predetermined number. When the planting work of the seedling is performed on the adjacent strip at the heel, the drawing marker (68) is lowered to the side where the seedling has already been planted. Therefore, the drawing marker (68) is prevented from crushing the seedling, and the operator does not need to extract the collapsed seedling and replant it to a new seedling, thereby reducing the labor of the operator. And the number of wasted seedlings is reduced.

  Further, when the number of times of raising and lowering the drawing marker (68) becomes a predetermined number or more, the operation of the marker switching device (72) is stopped, so that when the seedling is planted at the time of drawing, the drawing marker (68) Since it can prevent moving toward the adjacent stripe | line in which the seedling was planted, while the drawing marker (68) is prevented from being damaged, the drawing marker (68) crushes the seedling and the operator replants the seedling. Work becomes unnecessary.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, until the rotation speed of the traveling device (11) becomes equal to or higher than the predetermined rotation speed from the start of planting work, Even if the detection member (76) detects the planting work at the heel, the operation direction of the marker switching device (72) is switched alternately so that the heel detection member (76) is not at the heel. Therefore, it is possible to prevent the misunderstanding that the planting work is being carried out at the shore and prevent the operation of the drawing marker (68) from being inconsistent with the operation of the traveling vehicle body (2). This prevents the traveling vehicle body (2) from traveling straight, prevents the seedling planting strip from meandering or slanting, and improves seedling planting accuracy.

Then, the interval between the seedling planting strips is extremely narrowed, and it is prevented that the nutrients are mixed to cause poor growth, and the crop yield and quality are reduced.
In addition, the interval between the seedling planting strips becomes extremely wide, and it is possible to prevent the operator from having to manually plant seedlings, thereby reducing the labor of the operator.

  The effect of the invention described in claim 4 is that, in addition to the effect of the invention described in claim 3, when the rotational speed of the traveling device (11) becomes equal to or higher than a predetermined rotational speed, a light emitter ( With the configuration in which 76a) emits light, the operator can recognize that the edge detection member (76) can be detected, so that the operation of the edge detection member (76) is not accepted. It is possible to prevent the edge detection member (76) from being operated and to prevent the drawing marker (68) from being damaged due to contact with the outside of the field.

  The effect of the invention according to claim 5 is adjusted when the seedling planting part (4) rises above a predetermined height in addition to the effect of the invention according to any one of claims 1 to 4. Since the descending member (81) descends the seedling planting part (4) by a predetermined distance, the seedling planting part (4) can be slightly lowered to ensure the visibility behind the operator. During operation, the lower part of the seedling planting part (4) is prevented from coming into contact with the heel and being damaged.

  In addition, it is possible to prevent the generation of a space where seedlings are not planted between the start position of planting and the seedling planting position, so that the operator does not need to plant seedlings. The labor of the person is reduced.

  And since the descending distance of the seedling planting part (4) is determined, it is possible to prevent the seedling planting part (4) from coming into contact with the farm scene when it is unnecessary. The planting depth is disturbed, so that the growth failure of the seedling is prevented, and the seedling planting part (4) is prevented from crushing the seedling.

  The effect of the invention according to claim 6 is that, in addition to the effect of the invention according to any one of claims 1 to 5, the inclination detecting member (79) detects the inclination of the traveling vehicle body (2) having a predetermined angle or more. Then, since the switch type edge detection member (76) is automatically turned off, it is possible to prevent the edge detection member (76) from being forgotten to be cut, so that the drawing marker (68) is activated. Since the direction is appropriate, seedling planting accuracy is improved.

Side view of riding rice transplanter Top view of riding rice transplanter Front view of the main part showing the action state of the drawing marker Side view of main part showing lift cylinder and left / right switching solenoid Front view of main part showing line drawing marker Cross-sectional view showing a drawing marker Reference diagram showing travel direction during work Block diagram of each control member Flow chart showing control when the dredging work switch is set to “ON” Top view of a riding rice transplanter with a balance frame and additional weights Side view of a riding rice transplanter with the float in the lowest position Enlarged plan view of the main part of the control section Enlarged plan view of the main part of the travel control lever (A) Main part side view showing a diff lock arm operable from front and rear, (b) Main part plan view showing a diff lock arm operable from front and rear. Front view of a riding rice transplanter equipped with a differential lock arm The principal part top view which shows a differential lock mechanism and an engine rotation operation position (A) Main part front view showing a first operation when releasing the differential lock mechanism from the front side of the machine body, (b) Main part front view showing a second action when releasing the differential lock mechanism from the front side of the machine body, (c) ) Main part front view showing the third operation when releasing the differential lock mechanism from the front side of the machine body, (d) Main part front view showing the fourth action when releasing the differential lock mechanism from the front side of the machine body. (A) Main part front view showing a first operation when releasing the differential lock mechanism from the rear side of the machine body, (b) Main part front view showing a second action when releasing the differential lock mechanism from the rear side of the machine body, (C) Main part front view showing the third operation when releasing the differential lock mechanism from the rear side of the machine body, (d) Main part front view showing the rear operation when releasing the differential lock mechanism from the front side of the machine body. Front view of a riding type rice transplanter equipped with a heel-crossing arm that can rotate in the front-rear and left-right directions Front view of the main part of the arm over the heel that can be rotated back and forth and left and right Side view of the main part of the arm over arm that can be pivoted back and forth and left and right

Embodiments of the present invention will be described with reference to the drawings.
In this case, in the plan view, the left side with respect to the advancing direction of the aircraft is referred to as the left and right sides of the aircraft, and the right side with respect to the advancing direction of the aircraft is referred to as the other sides of the aircraft. Details of each part will be specifically described below.

  FIG.1 and FIG.2 is the side view and top view of a riding type rice transplanter which are one Example of the working machine of this invention. 12 and 19 are front views. In addition, although the rice transplanter currently disclosed by FIG. 2 is the structure of 4 row planting, you may use this structure for the rice transplanter of less than 4 strips, and the rice transplanter of 5 or more strips.

  In this riding type rice transplanter, a seedling planting portion 4 is provided 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 the main body portion of the fertilizer device 5 is disposed on the rear upper side of the traveling vehicle body 2. Yes. A transmission case 12 is provided at the front of the traveling vehicle body 2, front wheel final cases 13 and 13 are provided on the left and right sides of the transmission case 12, and the steering direction of the left and right front wheel final cases 13 and 13 is changed. A pair of left and right front wheels 10, 10 as drive wheels is provided on the left and right front wheel axles 14 projecting outward from each changeable front wheel support.

  A rear wheel rolling shaft (not shown) is fixed to the rear portion of the mission case 12 at the front end of the main frame 15 of the fuselage and provided horizontally at the rear end of the main frame 15 and at the center in the left-right direction. The left and right rear wheel gear cases 18, 18 are provided so as to be freely rollable with respect to the left and right rear wheel axles 18 a, 18 a projecting outward from the rear wheel gear cases 18, 18. Axis.

  Further, an engine 20 is provided at an upper portion of the main frame 15 and at a substantially central position in the front-rear and left-right directions of the airframe. A driving force of the engine 20 is supplied to a belt transmission device 21 and a hydraulic continuously variable transmission (HST) 23. Through the transmission case 12. The rotational power transmitted to the transmission case 12 is shifted by a transmission (not shown) built in the transmission case 12 and then separated into traveling power and external extraction power.

  As a result, part of the driving force is transmitted to the left and right front wheel final cases 13 and 13 to drive the left and right front wheels 10 and 10 to rotate, and the remaining driving force is applied to the left and right rear wheel gear cases 18 and 10. The left and right rear wheels 11, 11 are driven to rotate.

  Further, the external take-out power is transmitted to a planting clutch case 25 provided at the rear part of the traveling vehicle body 2, and is transmitted from the planting clutch case 25 to the seedling planting unit 4 via the planting transmission shaft 26. At the same time, it is transmitted to the fertilizer application device 5 via a fertilizer transmission mechanism (not shown).

  A flat floor step 35 covering the main frame 15 is provided on the main frame 15 so as to avoid the engine 20, and an engine cover 30 covering the engine 20 is provided on the floor step 35 and on the outer periphery of the engine 20. . The engine cover 30 is configured to be rotatable with a front lower portion as a rotation fulcrum, and a work seat 31 on which an operator sits is mounted on the upper portion.

  A bonnet 32 that houses various working mechanisms of the work vehicle is provided on the front side of the machine seat 31 and on the floor step 35, and switches for changing the setting of each working unit are provided above the bonnet 32. And a handle 34 for steering the left and right front wheels 10 and 10 by the operator.

  Further, in the floor step 35, the left and right sides of the work seat 31 are formed in a lattice shape, and mud mud adhering to the operator's feet moving on the floor step 35 falls to the field. Then, rear steps 36, 36 that also serve as fenders for the left and right rear wheels 11, 11 are provided at the rear of the floor step 35.

  Further, a support 38 is provided on each of the left and right sides of the front side of the traveling vehicle body 2, and a plurality of spare seedling platforms 38b for placing supplementary seedlings on the left and right supports 38a, 38a in the vertical direction. As shown in FIG. 1, two left and right spare seedling frames 38 are formed.

  By providing the left and right spare seedling frames 38, 38, a supplementary seedling can be loaded in the machine in advance, so that when the seedling to be planted runs out, the number of times the seedling is returned to the end of the field is reduced. , Work efficiency is improved.

  In addition, since it is not necessary to place seedlings on the floor step 35, the operator can easily move on the floor step 35, work efficiency is improved, and the loaded seedlings are prevented from dropping due to vibration of the aircraft. As a result, it is not necessary to pick up the seedlings that have fallen, and work efficiency is improved.

  A heel-crossing arm 39 is provided in front of the traveling vehicle body 2 and the bonnet 32 and at a central position in the left-right direction, and left and right grips 40, 40 for an operator to hold on both the left and right sides of the upper end of the heel-crossing arm 39. Is provided. In addition, a center mascot 41 is attached to the upper end of the overarm 39 so as to be rotatable in the front-rear direction.

  Further, a vertical support frame 41 is provided at the rear end portion of the main frame 15 and at a central position in the left and right directions, and base portions of a pair of upper and lower lift link arms 42 and 42 are arranged in parallel on the support frame 41. Then, the end portions of the lift link arms 42 and 42 are attached to the link frame 43 of the seedling planting portion 4 to form parallel links, and the lift cylinder 44 is attached to the main frame 15 and the support frame 41 so as to be stretchable. When the elevating cylinder 44 is extended, the seedling planting part 4 is lowered, and when the lifting cylinder 44 is contracted, the seedling planting part 4 is raised. The elevating cylinder 44 is configured to expand and contract by opening and closing a hydraulic valve 44 a provided in the main frame 15.

  Further, a transmission case 45 is provided on the link frame 43, and a planting part frame 46 is arranged in the vertical direction on the upper front side of the transmission case 45. A receiving roller 47 is rotatably provided at the upper end of the planting part frame 46, and a seedling tank 48 on which a plurality of seedlings are placed is supported by the receiving roller 47 and the rear part of the transmission case 45. The seedling tank 48 is provided with seedling fences 49 for partitioning seedlings at equal intervals, and a seedling guide 50 for guiding the seedlings between the right and left of the pair of seedling fences 49, 49 is provided at the upper end of the seedling tank 48. Provided.

  The pair of seedling fences 49, 49 have a left-right distance of about 30 cm, and if the left-right width of the seedling guide 50 is about 30 cm, which is the same as the left-right distance, the seedlings are easily guided to the seedling tank 48.

  A seedling receiving plate 51 having an L-shape in side view for receiving the seedling is fixed to the lower end portion of the seedling tank 48, and a seedling feeding device 52 for feeding the seedling downward to the front part of the machine body of the seedling tank 48, One pair of 52 is arranged per one line. Further, a plurality of planting transmission cases 53 and 53 are provided in the lower rear portion of the transmission case 45 as shown in FIG. 2 in this case, and two planting baskets 54 are provided on the left and right sides of the planting transmission case 53. , 54 are arranged respectively.

  The transmission case 45 not only supplies driving force to the planting transmission cases 53 and 53 but also drives a sliding device (not shown) that moves the seedling tank 48 in the left-right direction. When the seedling tank 48 arrives at the left and right ends by driving the sliding device, a switch (not shown) for operating the seedling feeding devices 52, 52 over a predetermined distance is turned on.

  Further, a rotation support arm 56 is provided at the lower part of the planting part frame 46 and at the left and right center part so as to be rotatable in the vertical direction, and float support arms (not shown) are provided on both the left and right sides. A center float 57C that slides in contact with the field is provided below the pivot support arm 56, and side floats 57L and 57R that slide in contact with the field are provided below the left and right float support arms, respectively. Then, a potentiometer 58 is provided at the mounting portion of the center float 57C, and the hydraulic valve 44a is finely opened / closed according to the angle of the center float 57C detected by the potentiometer 58, and the lift cylinder 44 is finely expanded / contracted. .

  Further, a pair of rotor link arms 59, 59 are provided on the upper side of the planting part frame 46, and a rotor suspension arm 60 is provided on one of the rotor link arms 59, 59 so as to be extendable and retractable. A rotor support arm 61 is provided on the other side. One rotor support arm 61 is provided on each of the left and right sides.

  Then, a base portion of the rotor transmission shaft 62 is provided at the rear portion of the rear wheel gear case 18 on the right side of the machine body toward the lower rear side, and a rotor transmission case (not shown) is provided at the end of the rotor transmission shaft 62. On the right side of the rotor transmission case is provided a right side rotor 63R that smoothes and smoothes the field in front of the right side float 57R, and on the left side of the rotor transmission case is the rear side of the connection transmission case 64R in the front-rear direction. Provide. Further, the right end portion of the center rotor 63C for leveling the field scene on the front side of the center float 57C is connected to the front side of the right connection transmission case 64R, and the left end portion of the center rotor 63C is connected to the left side. The left side float 57L is provided on the front side of the left connection transmission case 64L, and the left side float 57L is smoothed while rotating the field scene on the front side of the left side float 57L on the rear side of the left connection transmission case 64L.

  Further, a center rotor cover 65C covering the upper portion of the center rotor 63C is provided across the left and right of the left and right connection transmission cases 64L and 64R, and the left and right side rotors 63L and 63R are disposed on the rear side of the left and right connection transmission cases 64L and 64R. The leveling rotor unit 66 is configured by providing side rotor covers 65L and 65R that cover the upper part of the rotor.

  With the above configuration, the center float 57C and the left and right side floats 57L, 57R can move while being grounded after leveling the farm scene with the center rotor 63C and the left and right side rotors 63L, 63R. Since the depth of the seedlings to be planted in the field is kept constant, the growth of the seedlings is stabilized.

  Moreover, although the seedling planting part 4 is configured to move up and down finely according to the vertical angle of the center float 57C, the field scene is leveled by the center rotor 63C and the left and right side rotors 63L and 63R. An excessive change in the angle of the float 57C is prevented, and the seedling planting part 4 moves up and down only when there are large irregularities in the field, so that the seedling planting accuracy is further improved.

  Further, the center rotor 63C and the left and right side rotors 63L and 63R are covered with the center rotor cover 65C and the side rotor covers 65L and 65R, so that the center rotor 63C and the left and right side rotors 63L and 63R spring up the mud in the field. However, since the mud can be prevented from scattering to the surroundings, the machine body and the operator are prevented from being soiled by the mud.

  And as shown in FIG.1 and FIG.2, the marker rod 67 is provided in the machine body front side of the seedling tank 48, that is, the left and right end side on the side where the seedling is not placed, respectively, and at the end portions of the marker rods 67, 67, Drawing markers 68, 68 for drawing a line that serves as a mark for going straight ahead of the machine are rotatably mounted on the field. 3, 5, and 6, the drawing marker 68 is configured by arranging a plurality of groove cutting protrusions 68b, which form grooves by drawing a soil on the outer peripheral edge of the disk body 68a. Is.

  As shown in FIG. 3, support brackets 46 a are provided at the lower part of the planting part frame 46, and the left and right ends of the support bracket 46 a and the front side of the seedling tank 48 are interposed via marker arms 69 that are rotatable in the left-right direction. The marker rod 67 is attached. An urging spring 70 for urging the marker arm 69 toward the seedling tank 48 is provided between the lower portion of the support bracket 46a and the marker arm 69. A left / right switching solenoid 72 having left and right marker operation wires 71L and 71R is provided on the non-side.

  As shown in FIG. 4, the left / right switching solenoid 72 is provided with a left tension pin 73L that regulates the operation of the left marker operation wire 71L and a right tension pin 73R that regulates the operation of the right marker operation wire 71R. The left and right switching pins 72L are activated, the right tension pin 73R is activated, and the left and right tension pins 73L and 73R are not activated. Shall.

  The left and right marker operating wires 71L and 71R are connected to the upper portions of the left and right marker arms 69 and 69, respectively, and a handle potentiometer 74 for detecting the steering direction is provided at the base of the handle 34. When this is detected, the left / right switching solenoid 72 is activated.

  First, when the handle 34 is operated in either the left or right turning direction, the hydraulic valve 44a is operated to contract the elevating cylinder 44 and raise the seedling planting part 4 to the non-planting work height. At this time, the left and right marker operation wires 71L and 71R are inactivated due to the contraction operation of the elevating cylinder 44, and therefore the marker arms 69 and 69 are pulled by the biasing springs 70 and 70 to lift the marker rods 67 and 67. In other words, both the left and right marker rods 67, 67 are inactive.

  When the handle potentiometer 74 detects that the handle 34 has been steered in the right turn direction, when returning from the turn operation to the straight operation, the hydraulic valve 44a is actuated to extend the elevating cylinder 44 and plant the seedlings. The part 4 descends to the planting work height. At this time, the left / right switching solenoid 72 operates the left pulling pin 73L to switch the left marker operating wire 71L to the non-operating state, the left marker arm 69 is biased by the biasing spring 70, and the left marker rod 67 Is in a raised state. On the other hand, the right marker operating wire 71R moves backward as the lifting / lowering cylinder 44 extends, and the right marker arm 69 is rotated with a force stronger than the tension of the biasing spring 70 to bring the right marker rod 67 into the field. On the other hand, the posture is changed to a substantially horizontal posture, and the right drawing marker 68 attached to the end portion is in contact with the field scene to form a groove.

  Further, when the handle potentiometer 74 detects that the handle 34 is steered in the left turn direction, when returning from the turn operation to the straight operation, the hydraulic valve 44a is actuated to extend the elevating cylinder 44, and the seedling planting portion 4 descends to the planting work height. At this time, the left / right switching solenoid 72 operates the right tension pin 73R to switch the right marker operating wire 71R to the non-actuated state, the right marker arm 69 is biased by the biasing spring 70, and the right marker rod 67 Is in a raised state. On the other hand, the left marker operating wire 71L moves backward as the elevating cylinder 44 extends, and the left marker arm 69 is rotated with a force stronger than the tension of the urging spring 70 so that the left marker rod 67 is put into the field. On the other hand, the posture is changed to a substantially horizontal posture, and the left drawing marker 68 attached to the end is in contact with the field scene to form a groove.

  And the accommodation hook 75 which hooks the left and right marker rods 67, 67 to the non-actuated state is provided on both the left and right sides of the planting part frame 46, respectively. When not, the left and right marker rods 67, 67 can be accommodated. In the state where the marker rods 67, 67 are hooked on the housing hooks 75, 75, if the marker rods 67, 67 are configured to fit within the lateral width of the seedling tank 48, the drawing markers 68, 68 are less likely to protrude from side to side. The drawing markers 68, 68 hit the wall or the like and are not easily damaged.

  With the above configuration, the left and right line drawing markers 68, 68 are automatically raised before turning at the end of the field, so that the line drawing markers 68, 68 can be prevented from coming into contact with the field scene or the straw during turning, The seedling is prevented from being pushed down and the seedling replanting operation is omitted, and the drawing markers 68 and 68 are prevented from being damaged, and the durability is improved.

  Further, at the end of the turn, the drawing marker 68 on the same side as the right or left turning direction detected by the handle potentiometer 74 moves downward toward the field and draws a line, and the drawing marker 68 on the opposite side to the turning direction. As a result, the seedling transplanting machine can draw a straight line as a guideline for straight advancement to the next work position while performing the planting work. This makes it easier to go straight and improves seedling planting accuracy.

Further, since it is not necessary to operate the drawing markers 68 and 68 before and after the turn, the operator does not need to perform an extra operation, and the operability and work efficiency are improved.
The above-described operation in which the left and right line drawing markers 68 and 68 are alternately activated and deactivated in accordance with the turning direction is performed in a process of traveling straight in the field and turning 180 degrees at the field edge. On the other hand, at the four corners of the field, the so-called border, seedlings are planted while going straight along the edge of the field, and when planted to the corners, they turn backward 90 degrees, turn 90 degrees, move backwards a prescribed distance, and then go straight In the planting process, when the drawing markers 68 and 68 are alternately operated, the drawing marker 68 on the side near the heel descends and comes into contact with the heel, and a straight line is lowered without drawing a line at a necessary position. There is a problem that the drawing marker 68 and the marker rod 67 are damaged at the time of contact.

  For this reason, the work may be performed without using the drawing markers 68, 68. However, when performing a work form in which the shoreline and the inner periphery thereof are circulated and planted at the shoreline, In this case, there is no reference line, the already planted seedlings are stepped on the front wheels 10 and the rear wheels 11, and it is necessary to manually remove the stepped seedlings and replant them. There is a problem that increases. In addition, there is a problem that even if the seedlings are not crushed, the interval between the seedlings becomes extremely narrow, and there is a problem of causing poor growth due to nutrients, and a problem of causing pests due to poor ventilation.

  In order to solve the above problem, as shown in FIG. 2 and FIG. 12, an operation switch 76 is provided on the operation panel 33, and when the operation switch 76 is turned “ON”, the switching direction of the left / right switching solenoid 72 is set to the handle. The marker actuating sensor 77 that operates only in a fixed direction regardless of the operation direction of the potentiometer 74 and counts the number of times the drawing markers 68 and 68 are moved up and down is operated.

  In the work process of planting seedlings while going around the heel and the inner circumference one by one, the planting is first carried out on the inner circumference, and a line is drawn by the one side drawing marker 68 at the last work position on the heel. Since the turning angle at the four corners of the field is about 90 degrees, the drawing marker 68 necessary for forming a line is the left or right drawing marker 68.

  When the dredging operation switch 76 is set to “ON”, the marker operating sensor 77 automatically and continuously moves the drooping side drawing marker 68 downward after turning 90 degrees in the corner of the field, so that the operator travels straight ahead. Since the operation for raising and lowering the seedling planting part 4 and moving down the drawing marker 68 on the heel side before the start is not necessary, operability and work efficiency are improved.

  In addition, since the marker actuation sensor 77 counts the lifting and lowering of the drawing marker 68, when the planting operation is performed on the four sides of the inner periphery of the heel, the drawing marker 68 on the heel side is automatically moved downward. The drawing markers 68 and 68 can be moved to the left and right when the drawing operation can be performed from the inner periphery of the drawing to the drawing, that is, when the drawing is not performed by the drawing marker 68. In either case, it is possible to adopt a control configuration in which the left / right switching solenoid 72 is switched so as to be in an inactive state, so that the one drawing marker 68 is prevented from being damaged due to contact with the basket, and the other drawing marker 68 is This prevents the seedlings planted in the crushing from coming into contact with the seedlings.

  In order to achieve the above configuration, when the left / right switching solenoid 72 is actuated when the fourth raising of the seedling planting unit 4 is performed, the marker actuation sensor 77 generates a signal that restricts switching of the left / right switching solenoid 72. To send to. However, the marker actuation sensor 77 continues counting even when turning 90 degrees at the four corners of the heel, and the eighth count occurs, that is, the planting operation at the four corners of the heel is completed and the seedling planting section 4 is completed. Is raised, even if the operator does not operate the coasting work switch 76, the coasting work switch 76 is automatically turned off.

  With the above configuration, when the work is started after moving to the next field, the coasting work switch 76 is set to “ON” despite the work process in the field that needs to turn 180 degrees at the field edge. The steering line 34 is first steered, and the drawing marker 68 in the turning direction detected by the handle potentiometer 74 continues to appear, preventing the appropriate drawing operation from being performed and improving the work efficiency. , Prevents the seedlings from being crushed.

  The marker operation sensor 77 is provided on the lift link arms 42 and 42 so as to ensure counting even in the planting operation process at the heel when the operation of the left / right switching solenoid 72 is restricted. When configured to be interlocked with the vertical movement, the count can be performed reliably and simply.

  Further, when the coasting work switch 76 is in the “OFF” state, the left and right rear wheel rotation sensors 78 and 78 for calculating the travel distance and the travel speed by counting the rotation speed of the rear wheels 11 and 11 are set to a predetermined rotation speed. It is set as the structure which does not accept operation until it counts. Since the predetermined number of rotations varies depending on the size of the field and the work speed, it is preferable that the minimum number of rotations that can be accepted by the operator can be set.

  With the above configuration, when the work for lowering the seedling planting part 4 can be performed at the time of starting, such as before planting work or when resuming traveling, even if the saddle work switch 76 is erroneously operated, Until the predetermined distance is traveled, the drawing work control of the drawing marker 68 is not performed, so that it is possible to prevent the drawing of unnecessary parts or crushing the seedlings, thereby reducing the labor of the operator. .

  It should be noted that when the rimming work switch 76 is provided with a light emitter 76a such as an LED and the operation of the rimming work switch 76 can be accepted, that is, when the rear wheel rotation sensors 78 and 78 are rotated by a predetermined number or more, When the switch 76 is configured to blink, the operator can easily grasp the operation reception timing, and the operability is improved.

The light emitting body 76a may be configured to indicate that it is in a state where it always emits light and accepts an operation instead of blinking.
The main frame 15 of the traveling vehicle body 2 is provided with an inclination sensor 79 that detects the inclination of the seedling transplanter in the front-rear direction, that is, in the pitching direction. A configuration may be adopted in which it is determined that the moving work switch 76 is automatically turned off when it is moved.

  With the above configuration, when the work for planting the seedling is performed by lowering the seedling planting unit 4 until just before the entrance of the farm field, that is, when the work on the farm field is finished, the close-up work is finished. Therefore, it is possible to prevent forgetting to turn off the dredging operation switch 76, and the workability and seedling planting accuracy in the next field are improved.

  Further, in the seedling transplanter of this configuration, when the handle 34 is steered to the turning angle, the side clutch (not shown) inside the turning is disengaged. At this time, the rotational speed of the rear wheel rotation sensor 78 and the rear wheel rotation outside the turning are configured. When a difference of a predetermined value or more occurs in the rotational speed of the sensor 78, the hydraulic valve 44a is operated to contract the elevating cylinder 44, and the seedling planting unit 4 is automatically raised and lowered, and the steering angle of the handle 34 is set to a predetermined value. When the side clutch is connected and the rotational speeds of the left and right rear wheel rotation sensors 78 and 78 return to approximately the same, the hydraulic valve 44a is operated to extend the lifting cylinder 44, and the seedling planting unit 4 is automatically operated. Is lowered, and when the number of rotations of the rear wheel rotation sensors 78 and 78 further counts a predetermined value, the planting clutch 25a in the planting clutch case 25 is automatically turned “ON” to plant seedlings. Turning control mechanism T to start the work is mounted.

  However, although the turning control mechanism T has the effect of improving the planting accuracy by aligning the planting end position and planting start position of the seedlings when turning 180 degrees, it advances the aircraft until just before the dredging. In the case of 90-degree turning in which the seedling planting part 4 is lowered and then swiveled and then swung backward after turning and then the seedling planting part 4 is lowered and then the planting operation is resumed. If it is disturbed, planting accuracy is reduced, or raising and lowering against the intention of the operator causes the seedling to be crushed, and the worker replants, resulting in increased labor.

  For this reason, when the dredging operation switch 76 is operated, even if a difference of a predetermined value or more occurs between the rotation speeds of the left and right rear wheel rotation sensors 78, 78, the hydraulic valve 44 a is not operated, and the operator enters the hood 32. When the work operation lever 80 to be provided is operated, the seedling planting unit 4 is moved up and down, and the planting clutch 25a is turned “on” so that the driving force is transmitted to the planting transmission cases 53 and 53.

  With the above configuration, the turning control mechanism T can be turned on and off in accordance with the turning position of the seedling transplanter, so that it is not necessary to perform turning operation of the turning control mechanism T, and operability and work efficiency are improved. .

  In addition, as described above, when turning 90 degrees at the four corners of the field, the aircraft is advanced to the heel and moved backward to the turning start position. An operation of lowering and carrying out planting is required.

  At this time, since the seedling planting unit 4 is in the raised state, the seedling tank 48 and the seedling guide 50 of the seedling planting unit 4 obstruct the operator's view when the seedling planting unit 4 is retracted to the heel after the 90-degree turn is completed. The planting operation is started without retreating to the edge, and the seedling is manually planted in a place where the seedling is not planted, which increases the labor of the worker. In addition, there is a problem that the planting transmission cases 53, 53, the planting basket 54, etc. on the lower side of the seedling planting unit 4 are brought into contact with each other and damaged.

  In order to solve this problem, the operator has lowered the seedling planting part 4 slightly by manual operation to secure the field of view. However, since it is a fine adjustment work, the adjustment takes time, and the work efficiency is lowered. In addition, if the operation is mistaken, the seedling planting part 4 is lowered too much, and mud soil adheres to the planting ridges 54... There is a problem that the surface of the corners of the vine is rough, the planting depth of the seedlings is not constant, and poor growth occurs.

  For this reason, an adjustment lowering button 81 is provided on the operation control lever 80 or the operation panel 33, and when the adjustment lowering button 81 is operated, the hydraulic valve 44a operates for a predetermined time, for example, about 2 seconds, and the lifting cylinder 44 has a corresponding length. It is good to make it the structure which is extended only and the seedling planting part 4 is lowered | hung slightly.

  With the above configuration, the seedling tank 48 and the seedling guide 50 do not obstruct the field of view of the operator seated on the work seat 31, and the planting transmission cases 53, 53 and the planting basket 54 are sufficiently separated from the field scene. Since the seedling planting part 4 can be lowered, the worker can move backward while visually confirming the distance to the heel, so that the seedling is planted immediately before the heel and no manual planting is required. As a result, the farming scene is not disturbed, mud soil does not adhere to the planting basket 54, the seedling planting depth is constant, the seedling growth is stable, and the yield and quality are improved. improves.

  As described above, the lowering of the seedling planting unit 4 may control the operation time of the hydraulic valve 44a. However, a potentiometer (not shown) is provided on the lift link arms 42 and 42, and the potentiometer detects a predetermined angle. Then, it is good also as a structure which stops the hydraulic valve 44a.

  The operating direction of the drawing markers 68 and 68 is determined by the left / right switching solenoid 72 that is interlocked with the operation of the elevating cylinder 44 as the seedling planting part 4 is moved up and down during turning. When the handle 34 is operated or when the handle 34 is operated largely so as to avoid the obstacle, the seedling planting unit 4 may rise and actuate the left / right switching solenoid 72. If the operation is continued in this state, the drawing marker 68 on the opposite side to the turning direction becomes a drawing operation state, and there is a problem that the seedling is lowered to a position where the seedling has already been planted, and the seedling is crushed.

  For this reason, an operator needs to adjust the operation order of the left-right switching solenoid 72 by stopping traveling and raising and lowering the seedling planting unit 4 to prevent erroneous operation of the drawing markers 68 and 68 due to erroneous operation.

  However, the adjustment operation described above can be performed when the operator recognizes that the operator has made an incorrect operation.If the operator does not realize that the operator has made an incorrect operation, the operator can turn the vehicle without noticing. The drawing marker 68 on the side that should not be in the working state will be in the working state.

  In order to prevent this, the turning direction is determined from the difference between the rotational speeds of the left and right rear wheel rotation sensors 78, 78, and the operating direction of the left / right switching solenoid 72, that is, the left pulling pin 73 or the right pulling pin 73R is operated. When the direction does not coincide with the turning direction, if the buzzer 82 is activated to notify the operator, the operator can notice that the operation timing of the drawing marker 68 is not suitable during the turning at the latest. Adjustment operation can be performed before turning is finished and planting of seedlings is started, drawing work is performed appropriately, and planting accuracy of seedlings is improved.

In addition, the detection direction of the handle potentiometer 74 may be used for detection of the turning direction of the seedling transplanter.
FIG. 10 shows a configuration in which a slide preliminary seedling frame 83 that can be switched between a stacked state in which the preliminary seedling stage 38b is arranged in a plurality of stages, in this case two stages in the vertical direction, and an unfolded state in the front-rear direction is provided on the left side. is there. Further, in this configuration, left and right balance frames 84 are provided on the front side of the main frame 15 and below the floor step 35 in order to prevent the front side of the machine body from being lifted.

  Since the slide preliminary seedling frame 83 has a switching mechanism (not shown) between the unfolded state and the stacked state, the weight of the slide preliminary seedling frame 83 is increased by about 5 to 6 kg as compared with the conventional preliminary seedling frame 38, so that the center of gravity of the aircraft is on the left side. There is a problem of getting close and unbalanced.

The balance frames 84 and 84 are formed in a box shape, the inside is hollow, and an extension weight 85 made of a plate-like metal can be arbitrarily inserted therein.
With the above configuration, the left and right aircraft balance can be stabilized by arranging the additional weight 85 equivalent to 5 to 6 kg in the balance frame 84 on the right side of the aircraft where the normal spare seedling frame 38 is provided. It is prevented that the posture is biased or the posture is disturbed on an inclined ground, so that traveling performance is improved and work safety is improved.

  In addition, by forming the hollow portion formed in the balance frame 84 long in the left-right direction, it is possible to arrange a plurality of additional weights 85 or adjust the arrangement of the additional weights 85 to adjust the left-right balance of the aircraft, Detailed left and right balance adjustment is possible.

  Further, when the lifting of the seedling planting unit 4 and the fertilizer application 5 cannot be suppressed by the left and right balance frames 84 and 84 alone, the additional weights 85 are not lifted to the left and right balance frames 84 and 84. Since it can also arrange | position, safety | security improves further.

  In FIG. 10, the slide seedling frame 83 is provided on the left side. However, as shown in FIG. 2, when both the left and right normal seedling frames 38 are used, the left and right balance on the front side of the machine body is stable.

  However, the hydraulic continuously variable transmission (HST) 23 mounted on the seedling transplanter of the present case is provided on the right side of the center line of the machine body, and the weight balance of the entire machine body is on the right side.

  In addition, the fertilizer application device 5 is provided with a fertilizer blower 86 that generates a wind for sending fertilizer to each strip. Since the fertilizer blower 86 is provided with a heavy object such as a motor, The weight balance is on the right.

  For this reason, when providing the additional weight 85 that prevents the front side of the machine body from being lifted, if it is provided on the balance frame 84 on the left side of the machine body, the left and right balance of the machine body can be stabilized, and the running performance and safety are improved.

  As shown in FIGS. 11 and 12, the elevating cylinder 44 is configured to be further extendable from the extended state in which the seedling planting portion 4 is lowered to the maximum, and the operation operation lever 80 formed on the operation panel 33 is formed. A “lowermost” position is formed in the lever guide 80a that moves the lever to a predetermined working position. Note that the conventional lever guide 80a is "raised" to raise the seedling planting part 4 from the rear side of the aircraft, "neutral" to stop the raising and lowering of the seedling planting part 4, and "descent" to lower the seedling planting part 4 The planting clutch 25a is set to “ON” to drive the planting transmission case 53, and the planting part 4 is moved up and down when the operation lever 80 is operated to the corresponding position. The planting clutch 25a is turned on and off.

The “lowermost” position is formed at a position where an L-shaped groove is cut to the side of the “lowering” position and the operation lever 80 cannot be moved unless the operator consciously operates it.
Then, when the operation control lever 80 is operated to the “lowermost” position, the lifting cylinder 44 continues to expand even when the seedling planting unit 4 comes into contact with the field scene, and the left and right rear wheels 11, 11 move from the field scene. The seedling transplanter is spaced upward and is supported by the left and right front wheels 10 and 10, the center float 57C, and the left and right side floats 57L and 57R.

  By adopting the above configuration, when the rear wheels 11 and 11 are attached and detached and when maintenance work is performed from the lower side of the main frame 15, the work can be performed without using equipment such as a jack. Even if a failure occurs during planting work, you can check problems and perform emergency repairs without interrupting the work by returning the jack or taking the seedling transplanter once, so work efficiency Will improve.

In addition, since it is easy to see the lower side of the rear wheel 11 and the main frame 15, it is easy to check the cause of the failure and replace the parts, so that maintainability is improved.
In the above configuration, the “lowermost” position is formed in the lever guide 80a of the operation lever 80 so that the lowering operation of the seedling planting portion 4 can be performed. However, as shown in FIG. The opening and closing direction of the trunnion shaft (not shown) of the device 23 is changed, the forward / backward movement and the traveling speed of the traveling vehicle body 2 are actuated on the grip portion 87a of the traveling operation lever 87, and the hydraulic valve 44a is operated. It is good also as a structure provided with the up-and-down movement button 88u, 88d which expands / contracts, the planting button 88p which switches on / off of the planting clutch 25a, and the lowest-down button 88m which lowers the seedling planting part 4 to the lowest.

With the above configuration, the operator can operate raising / lowering the seedling planting unit 4 and turning on / off the planting clutch 25a without reaching the operation panel 33 side, so that workability is improved.
Depending on the configuration of the seedling transplanter, when the traveling vehicle body 2 is moved backward, the rotation direction of the planting clutch 25a is reversed. If the planting clutch 25a having such a configuration is rotated in the reverse direction as it is, an overload is generated and is damaged. Therefore, when the reverse rotation starts, a reverse clutch mechanism 90 that turns the planting clutch 25a “off” is provided.

  However, if the planting clutch 25a is disconnected during planting, it may cause a section where seedlings are not planted. Even if the mechanism 90 performs the disengagement operation of the planting clutch 25a, the reverse rotation may continue without being “disengaged”.

  For this reason, a vibration sensor 91 for detecting vibration when the reverse clutch mechanism 90 is operated is provided, and the rotation direction detected by the left and right rear wheel rotation sensors 78, 78 detects reverse movement. When the vibration sensor 91 does not detect vibration within 10 seconds), the buzzer 82 is activated to notify the operator.

  With the above configuration, when the reverse rotation clutch mechanism 90 cannot turn off the planting clutch 25a, the buzzer 82 immediately notifies the operator of the occurrence of the problem, so that the operator manually operates the operation lever 80. Thus, the planting clutch 25a can be surely set to the “off” state, and the planting clutch 25a is prevented from being damaged.

Instead of operating the buzzer 82, the traveling operation lever 87 may be returned to the neutral position by a motor or the like (not shown) to stop the backward movement.
Since the rotation of the planting clutch 25a stops when the traveling vehicle body 2 stops traveling, it is possible to notify the operator of an abnormality by stopping the planting clutch 25a while preventing the planting clutch 25a from being damaged.

  As shown in FIGS. 14 to 18, a differential operation panel 94 having a differential operation lever guide 94 a is provided in a vertical direction on the left front side of the work seat 31, below the bonnet 32 and on the left side of the machine body. The differential operation lever guide 94a is provided so as to provide a differential arm 93 having a letter "H" shape in a side view.

  A rotation fulcrum attached to the main frame 15 via a rotation shaft (not shown) is formed at the bent portion of the differential arm 93 so as to be rotatable in the front-rear direction, and the connecting wire 95 is connected to the differential arm 93. It is provided across the front end side and the differential pedal arm of the differential gear mechanism (not shown). A front differential grip 96 for allowing an operator to operate the differential arm 93 from the front side of the machine body is provided at the front end of the differential arm 93 so as to be rotatable in the left-right direction. If the front differential grip 96 is not operated, the outer side on the left side of the machine body is provided. A first spring 97 that biases in the direction is disposed across the differential operation panel 94.

  Further, an engine rotation wire 98 for operating the throttle of the engine 20 to increase or decrease the rotational speed is passed through the differential operation panel 94, and an end of the engine rotation wire 98 is attached to the front differential grip 96.

  Then, a second spring 99 is provided downward from the floor step 35, the rear part and the floor step 35 are connected by the second spring 99 with respect to the rotation fulcrum of the differential arm 93, and the differential arm 93 is biased downward. The rear end side of the differential arm 93 is passed through the rear differential operation lever guide 100a formed on the rear differential operation panel 100 provided on the lower side of the left side of the work seat 31. Further, a rear differential grip 101 that is manually operated by an operator seated on the work seat 31 is provided at the rear end of the differential arm 93.

  The differential operation panel 94 is formed with a groove that is long in the vertical direction and a differential operation lever guide 94a composed of a horizontal groove on the upper side of the vertical groove. The differential gear mechanism is operated at the lower end of the vertical groove. A “cut” position is formed in which the front differential grip 96 is positioned in a state where the front differential grip 96 is not set. In addition, a differential "on" position where the differential gear mechanism is "on" is formed on the side closer to the upper and lower grooves in the horizontal groove, and the accelerator maximum position for maximizing the number of revolutions of the engine 20 on the side far from the upper and lower grooves. Form. In each position, a vertical kerf is formed, and a front projection 102 that can be inserted into the kerf is attached to the lower side of the front differential grip 96.

  When the front protrusion 102 is inserted into the groove at the “cut” position, the differential gear mechanism is deactivated, and the left and right front wheels 10 and 10 operate independently. When the front protrusion 102 is inserted into the kerf of the differential “on” position, the differential gear mechanism is locked and the left and right front wheels 10 and 10 rotate in conjunction with each other. Furthermore, when the front protrusion 102 is inserted into the groove at the accelerator maximum position, the engine rotation wire 98 is pulled to the maximum, and the rotation speed of the engine 20 is increased to the maximum.

  Also, the rear differential operation panel 100 is formed with a rear differential operation lever guide 100a having a wide width in the left-right direction. The rear differential grip 101 is moved up and down when not operated by the urging force of the second spring 99. The rear differential grip 101 is positioned above the groove. A groove portion that is inclined upward toward the inner side of the fuselage is formed below the rear differential operation lever guide 100a and on the inner side of the fuselage, and a rear protrusion 103 is provided on the inner side of the differential arm 93 so as to be inclined upward. When the rear projection 103 is inserted into the groove portion of the rear differential operation lever guide 100a, the differential gear mechanism is locked and the left and right front wheels 10, 10 rotate in conjunction with each other.

  With the configuration described above, the front differential grip 96 or the rear differential grip 101 when the front wheels 10, 10 are idled and cannot be turned when the operator is seated on the work seat 31 or is off the traveling vehicle body 2. Since the differential gear mechanism can be switched to the locked state by operating, the work efficiency is improved without being interrupted even if the mud soil is taken when turning the field edge.

  Conventionally, the differential lock pedal on the traveling vehicle body 2 could not be operated from the outside of the traveling vehicle body 2, so the operator had to step up the differential body on the traveling vehicle body 2 by stepping on the differential lock pedal 92. There was a problem to do.

  In the present plan, since the differential lock pedal does not protrude upward from the floor step 35, the differential lock pedal is prevented from being caught on the operator's foot when moving the floor step 35, and the work efficiency is improved and the safety is improved. To do.

  When the front differential grip 96 is operated not only to the differential gear mechanism but also to the accelerator maximum position, the rotational speed of the engine 20 increases to the maximum, so the mud viscosity in the field is high, and the differential gear mechanism alone cannot escape from the mud. Even if this happens, the resistance of the mud can be increased by increasing the output, so that the traveling work is prevented from being hindered, and the work efficiency is improved.

  Further, the differential spring 93 and the front differential grip 96 are not hooked in the kerf by the first spring 97 and the second spring 99, and when in a non-operating state, the differential lock mechanism is automatically inactivated and the engine 20 Since the rotational speed is reduced, the working state can be changed by lightly operating the differential arm 93 and the front differential grip 96 after passing through the differential lock mechanism or the part where the high rotational speed of the engine 20 is required. , Operability and work efficiency are improved.

  As shown in FIGS. 19 to 21, on the front side of the traveling vehicle body 2, when leaving the field or moving the inclined portion, the operator grasps from the front side of the machine body to assist in straight traveling, and prevents lifting. A saddle crossing arm 104 is provided, and the center mascot 41 is attached to an upper end portion of the saddle crossing arm 104 so as to be pivotable back and forth. Further, on both the left and right sides of the upper end portion of the heel-crossing arm 104, heel-crossing grips 105, 105 that are gripped by the operator's hand are provided.

  Some of the entrances and exits of farm fields such as paddy fields are built with raised soil, and these entrances and exits are gradually uneven due to the movement of seedling transplanters and workers and erosion caused by wind and rain. An operator standing in front of the seedling transplanter and gripping the heel overgrip 105, 105 tilts or twists this doorway in accordance with the irregularities in order to apply the force evenly to the heel overgrip 105, 105. Since the postures of the heel-crossing arm 104 and the heel-crossing grips 105 and 105 are not changed, the work is performed with an unnatural posture, and thus a great effort is imposed on the worker.

  For this reason, as shown in FIG. 21, a heel-passing rotation frame 106 that is rotatable in the front-rear direction is provided at the front end of the main frame 15 so as to be rotatable within a predetermined range in the front-rear direction. A base portion of the overarm arm 104 is pivotally attached to the center portion of the front side of the moving frame 106 in the left-right direction so as to be rotatable in the left-right direction. Note that the heel overarm 104 is provided via a bearing 104a or the like.

  Then, in order to prevent the eyelid passing arm 104 from excessively rotating in the left and right direction, at least a pair of left and right stop pins 107 and 107 for receiving the eyelid passing arm 104 at a predetermined position are provided on the front side of the eyelid passing rotation frame 106. Provide. In addition, since the overarm 104 is long in the vertical direction, it is desirable that the stop pins 107, 107 are arranged at a plurality of positions in the vertical direction with a wider left-right spacing toward the upper side.

  Further, a torque spring 108 is provided at the base of the heel overarm 104, and when the operator releases his hand from the heel overgrip 105, 105 or the heel overarm 104, it automatically returns to the center position. Forgetting to return 104 is prevented.

  With the above-described configuration, the heel-crossing arm 104 can be rotated to grip the heel-crossing grips 105 and 105 at a position that matches the posture of the worker, so that the worker can operate at the entrance / exit of the farm field in a relatively natural posture. Therefore, the work efficiency is improved, the worker is less tired, and the labor of the worker is reduced.

  In addition, since it can be rotated in the front-rear direction by the over-turning rotation frame 106, it is easy for the operator to change to a working state in which the lifting of the traveling vehicle body 2 can be easily suppressed, and therefore the labor of the operator is further reduced. .

2 Traveling body 4 Seedling planting part 11 Rear wheel (traveling device)
72 Left / right switching solenoid (marker switching member)
76 Edge work switch (edge detection member)
76a Light emitter 77 Marker operation sensor (operation number detection member)
78 Rear wheel rotation sensor (running rotation detection device)
79 Tilt sensor (Tilt detection member)
80 Work operation lever (work operation member)
81 Adjustment lowering button (Adjustment lowering member)

Claims (6)

A seedling planting part (4) for planting seedlings in the field is provided at the rear of the traveling vehicle body (2) so as to be movable up and down, and a line serving as an indicator of straight traveling is formed in the field on the side of the seedling planting part (4). In a seedling transplanter provided with a marker marker (68) and provided with a marker switching device (72) that alternately switches the operating direction of the marker marker (68) in conjunction with the raising and lowering of the seedling planting part (4),
When a cocoon detection member (76) for detecting planting work at the heel is provided, and the heel detection member (76) detects a planting work at the heel, the seedling planting part (4) is moved up and down. A seedling transplanter characterized in that the operation direction of the drawing marker (68) of the marker switching device (72) is not switched even if it is made to do.   When the heel detection member (76) detects a planting operation at the heel, an operation number detection member (77) for storing the number of times the drawing marker (68) is moved up and down is provided, and the operation number detection member (77) is detected. When the number of times is less than the predetermined number, the operation direction of the marker switching device (72) is not switched even when the seedling planting part (4) is moved up and down, and the number of detection times of the operation number detecting member (77) is predetermined. The seedling transplanter according to claim 1, characterized in that the operation of the marker switching device (72) is stopped so that the drawing marker (68) does not form a line in the field when the number of times exceeds the number.   The travel vehicle (2) is provided with a travel device (11), a travel rotation detection device (78) for detecting the rotational speed of the travel device (11) is provided, and the rotational speed detected by the travel rotation detection device (78). From when the planting operation starts until the predetermined number of times or more, even if the ridgeline detection member (76) detects the planting operation at the ridgeline, the operating direction of the marker switching device (72) is alternated. The seedling transplanter according to claim 1, wherein the seedling transplanter is configured to be switched.   A light emitting body (76a) is provided on the edge detection member (76), and the light emitting body (76a) emits light when the traveling rotation detection device (78) detects a rotation more than a predetermined number of times. The seedling transplanter according to claim 3.   A work operation member (80) for operating the seedling planting section (4) automatically moves the seedling planting section (4) when the seedling planting section (4) is raised above a predetermined height. The seedling transplanting machine according to any one of claims 1 to 4, further comprising an adjustment lowering member (81) for lowering to a predetermined distance.   When the coasting detection member (76) is configured by a switch, the traveling vehicle body (2) is provided with an inclination detection member (79) for detecting an inclination, and when the inclination detection member (79) detects an inclination of a predetermined angle or more. The seedling transplanting machine according to any one of claims 1 to 5, characterized in that the edge detection member (76) is automatically "cut".

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