JP4610981B2 - Agricultural work machine - Google Patents

Description

  The present invention relates to an agricultural working machine such as a rice planting machine provided with a leveling device.

  For example, as an agricultural work machine such as a rice planting machine equipped with a leveling device, a planting device for simultaneously planting multiple seedlings through a lifting link mechanism at the rear of a traveling machine body having a front wheel and a rear wheel is supported to be movable up and down. In addition, it is located in front of the planting device behind the rear wheel, and moves up and down in conjunction with the planting device, and supports the leveling device so that the position of the planting device can be adjusted. Are known.

  In such agricultural work machines, traveling of the traveling machine body, planting of seedlings by the planting device, and leveling work by the leveling device are performed by the output of the engine mounted on the traveling machine body. . Power is transmitted to the planting device via a PTO shaft, and power is transmitted to the leveling device via another transmission shaft.

  The up / down operation of moving the leveling device to the leveling position and the non-leveling position with respect to the planting device is performed by an operation lever arranged on the planting device side, and power on / off of the leveling device is performed on the traveling device side. This is performed by an operation lever arranged at the position (for example, see Patent Document 1).

Japanese Patent Laying-Open No. 2004-65111 (FIG. 3 on page 5)

  In the prior art, since the planting device and the leveling device move in conjunction with the vertical direction, the leveling position (the height of the leveling device) changes depending on the seedling planting depth (working position of the planting device), In some cases, proper leveling work could not be performed.

  In view of the circumstances described above, the present invention provides an agricultural work machine that can adjust the height of the leveling device with a simple operation in accordance with the change of the work position of the planting device and can perform appropriate leveling work. With the goal.

In order to achieve the above object , the present invention includes a traveling machine body (11) that is equipped with an engine (17) and travels by the power of the engine (17).
A planting device (31) supported by the traveling machine body (11) so as to be movable up and down;
The traveling machine body (11) and the lifting supported leveling means relative to said traveling machine body in conjunction (11) to the lifting of the arranged and with the planting device (31) between said planting device (31) ( 52) ,
Said ground leveling means (52), in the lowered position interlocked with the lowered position of the planting device (31), and vertical movement means for vertically moving into a working position and a non-working position (61),
In the agricultural work machine comprising the leveling means (52) and the height adjusting means (111) for adjusting the vertical position at the work position with respect to the planting device (31) ,
A connection pin (64) connected to the leveling means (52), a first pin (65) interlocked with the operation means (85) of the vertical movement means (61), and the height adjustment means (111). A linkage arm (66) having a second pin (116) interlocking with the operating member (47),
The linkage arm (66) is rotated about the second pin (116) by the first pin (65) based on the operation of the operating means (85) of the vertical movement means (61). The leveling means (52) is moved up and down to the working position and the non-working position via the connecting pin (64), and based on the operation of the operating member (47) of the height adjusting means (111), The second pin (116) is rotated around the first pin (65) as a pivot point, and the vertical position of the leveling means (52) in the working position is adjusted via the connection pin (64). Become,
It is characterized by that.

  By operating the operating member (47) of the height adjusting means (111), the vertical position of the leveling means (52) is adjusted at the work position, and the planting depth of the planting device (31) is adjusted. Do it.

The vertical movement means (61) is linked to the operation means (85) and is rotatably supported by the frame (32, 34) of the planting device (31) by a fulcrum shaft (62) and at the tip. An arm (63) provided with the first pin (65);
The fulcrum shaft (62) of the arm (63) and the second pin (116) are arranged substantially on one axis .

  The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

According to the present invention according to claim 1, the leveling means, in a state in which lowered in conjunction with the planting device can be switched between the working position and a non-working position by vertical movement means, in a further working position, height Since the height of the planting device can be adjusted by the adjusting means , the leveling work by the leveling means can be performed at an appropriate position according to the planting depth or the like.

According to the present invention according to claim 2, leveling means, Ru is adjusted to a position corresponding to the automatic planting depth by planting depth adjustment means.

According to the first aspect of the present invention, the pins on the vertical movement means and the height adjustment means side are respectively connected to the linkage arms, and the adjustment by the vertical movement means is performed using the second pin on the height adjustment means side as a pivot point. The height adjustment means adjusts the height of the leveling means by the vertical movement means and the height adjustment means by rotating the linkage arm about the first pin on the vertical movement means side as a pivot point. It can be performed independently and smoothly without interference.

Furthermore, according to the third aspect of the present invention, since the fulcrum shaft of the arm constituting the vertical movement means and the second pin are arranged substantially on one axis, the linkage arm of the vertical movement means by the arm of the vertical movement means is arranged. The rotation can be smoothly performed using the pin 2 as a fulcrum.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a side view of an agricultural work vehicle according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is an enlarged side view of a leveling device in a non-working position, and FIG. 4 is a leveling in a working position. 5 is an enlarged side view of the apparatus, FIG. 5 is a front view showing the arrangement in the operation means of the leveling device, FIG. 6 shows the operation state of the clutch in the operation means, (a) at the time of clutch engagement operation, (b) at the clutch. FIG. 7 is a plan view of the height adjustment mechanism, FIG. 8 is an enlarged side view showing the height adjustment state at the time of shallow planting of seedlings, and FIG. 9 is at the time of deep planting of seedlings. It is an enlarged side view which shows a height adjustment state.

  As shown in FIGS. 1 and 2, the agricultural work machine 10 includes a traveling machine body 11, an elevating link mechanism 21, a planting device 31, and a leveling device 51.

  The traveling machine body 11 has a machine body 15 supported by front wheels 12 and rear wheels 13, and an engine 17 covered with a hood 16 is mounted in front of the machine body 15. Behind the engine 17, a driver's seat having a steering handle 18 and various levers and pedals necessary for driving the agricultural work machine 10 and a seat 20 is disposed.

  The elevating link mechanism 21 is disposed at the rear part of the traveling machine body 11, and is supported at the rear end of the upper link 22 and the lower link 23, and the upper link 22 and the lower link 23 that are swingably supported by the rear part of the machine body 15. A connected link holder 25 and a hydraulic cylinder 26 disposed between the machine body 15 and the lower link are provided. The link holder 25 swings in the vertical direction by the operation of the hydraulic cylinder 26.

  The planting device 31 comprising a planting means 33 for scraping one seedling from a mat-like seedling and planting it on a rice field, and a planting depth adjusting means 41 for adjusting the planting depth of the seedling, A frame 32 is supported by the link holder 25 of the elevating link mechanism 21 via a rolling shaft (not shown) so as to be freely rollable.

  As shown in FIGS. 3 and 4, the planting means 33 is inclinedly arranged on a stay 34 fixed to the frame 32 so that the front becomes higher, and a seedling platform 35 on which a mat seedling is placed, The plurality of transmission cases 36 disposed on the rear end surface of the frame 32, the plurality of planting cases 37 rotatably supported on the side surface of the rear end portion of the transmission case 36, and the planting case 37 A plurality of planting ridges 38 for scraping one seedling from the mat seedling on the seedling platform 35 and planting it on the rice field are arranged.

  Power is transmitted to the planting rod 38 from the PTO shaft (not shown) driven by the engine 17 mounted on the traveling machine body 11 through the frame 33 and the transmission case 36.

  The planting depth adjusting means 41 includes a shaft 42 rotatably supported on the lower surface of the transmission case 37, an arm 43 having one end fixed to the shaft 42 and projecting downward and rearward, and the arm 43 is rotatably supported at the other end of 43, and the lower surface of the float 45 is in contact with the rice field and slides. The arm 46 is fixed to the shaft 42 and protrudes upward. The other end of the arm 46 And an adjustment lever 47 operable along the lever guide 48.

  The adjustment lever is operated by selecting any one of a standard position, a shallow planting position, and a deep planting position, and is held at the position selected by the lever guide 48.

  When the adjustment lever 47 is operated toward the traveling machine body 11, the arm 46 and the arm 43 are rotated counterclockwise to raise the float 45 with respect to the transmission case 36. That is, if the float 45 is in contact with the rice field, the entire planting device 31 is lowered with respect to the rice field. Therefore, the planting rod 38 can approach the rice field and deeply plant seedlings.

  Further, when the adjustment lever 47 is operated to the seedling bed 35 side, the arm 46 and the arm 43 are rotated clockwise to lower the float 45 with respect to the transmission case 36. That is, if the float 45 is in contact with the rice field, the entire planting device 31 is raised with respect to the rice field. Therefore, the planting ridge 38 can be separated from the rice field and can be used for shallow planting of seedlings.

  As shown in FIGS. 3 and 4, the leveling device 51 is disposed so as to be positioned between the rear wheel 13 of the traveling machine body 11 and the float 45 of the planting device 31. When it is moved to, it is supported on the planting device 31 side so that the surface of the rice field can be scraped smoothly.

  The leveling device 51 includes leveling means 52 that smoothens the surface of the field, and vertical movement means 61 that moves the leveling means 52 in the vertical direction between the work position and the non-work position at the work position of the planting device 31. , A power transmission device 71 that transmits power to the leveling means 52, an operation means 81 that simultaneously performs vertical movement of the leveling means 52 in the vertical movement means 61 and power on / off of the power transmission device 71, and seedling It is comprised with the height adjustment means 111 which adjusts the height of the said leveling means 52 at the time of planting depth adjustment.

  The leveling means 52 includes a support rod 53, a roller 55 supported by the support rod 53, a rotary shaft 56 rotatably supported by the roller 55, and a plurality of cage types supported by the rotary shaft 56. A rotor 57 and a rotor cover 58 that covers the upper portion of the cage rotor 57 are provided.

  The vertical movement means 61 is supported by a support shaft 62 (fulcrum shaft) rotatably supported by the stay 34, an arm 63 supported at one end by the support shaft 62, and the other end of the arm 63. In addition, a pin 65 (first pin) and a linkage arm 66 formed in a substantially triangular shape and having one corner rotatably supported by the pin 65 are provided. One end of the link 67 is rotatably supported by the support shaft 62, and the other end of the link 67 is rotatably supported by the other end of the link 67.

One corner of the linkage arm 66 is pivotally connected to the center portion of the support rod 53 by a connecting pin 64 , and the other end of the link 68 is pivotable to the upper end portion of the support rod 53. It is connected and supports the leveling means 52. It is urged upward (non-working position) by a spring 70 stretched between the front surface (surface on the traveling machine body 11 side) of the seedling platform 35 and the support rod 53.

  The power transmission device 71 includes a power transmission mechanism 72 disposed at the rear portion of the body 15 of the traveling body 11, a clutch 73 disposed on the output side of the power transmission mechanism 72, and power transmission via the clutch 73. A telescopic transmission shaft 75 that receives the transmission is provided. The clutch 73 is provided with an operation rod 76 for turning the clutch 73 on and off.

  When the clutch 73 is engaged, the output of the power transmission mechanism 72 is transmitted to the rotary shaft 56 to rotate the cage rotor 57. When the clutch 73 is turned off, the power of the power transmission mechanism 72 is cut off and the rotation of the cage rotor 57 is stopped.

  The operation means 81 is rotatably supported by a shaft 82 and is integrally fixed to the operation lever 85 and an operation lever 85 operable along a lever guide 83 disposed below the side surface of the seat 20. And a cam plate 90 in which a cam groove 88 (see FIG. 6) including a pressing surface 86 and an allowable portion 87 is formed. Then, the cam plate 90 is branched into an elevating operation system for the leveling means 52 and a rotational operation system for the cage rotor 57 of the leveling means 52.

  The raising / lowering operation system is supported by a link 92 having one end rotatably connected to a pin 91 fixed to the cam plate 90 and one end rotatably supported by a rear end of the machine body 15 via a shaft 93. The other end of the link 92 is pivotally connected to the other end of the link 92 through a pin 96, the link 97 is pivotally connected to the pin 96 at one end, and the pin 98 is L-shaped. The bent portion of the arm 100 is rotatably supported by the link holder 25 together with the lower link 23, one end of which is rotatably connected to the other end of the link 97, and the other end of the arm 100 at one end. A pin 102 that slidably penetrates the formed long hole 101 is provided, and an arm 103 having the other end fixed to the support shaft 62 is provided.

  In the rotation operation system, a long hole 105 through which the shaft 82 is slidably penetrated is formed at the upper end, and a bracket 107 having a pin 106 slidably engaged with the cam groove 88 at the center (see FIG. 6). A link 108 connected to the bracket, and an arm 110 connected to the operation rod 76 of the clutch 73.

  When the operation rod 76 is operated in the front-rear direction through the cam groove 88, the pin 106, the bracket 107, the link 108, and the arm 110 by the operation of the operation lever 85, the clutch 73 is turned on and off. Can do.

As shown in FIGS. 7, 8, and 9, the height adjusting means 111 includes an arm 112 fixed to the shaft 42, a link 113 rotatably connected to the arm 112, and a link 113. A fixed bracket 115 and a pin 116 that is supported by the bracket 115 so that its axis substantially coincides with the axis of the support shaft 62 when the seedling is deeply planted, and is rotatably connected to the linkage arm 66. (Second pin). The height adjusting means 111 is operated by operating an adjusting lever 47 of the planting depth adjusting means 41.

Therefore, when the support shaft 62 is rotated by the operation of the operation lever 85 of the operation means 81, the operation force of the linkage arm 66 is transmitted through the arm 63 and the pin 65 (first pin). Oscillate around the pin 116 (second pin). When the height adjusting means 111 is operated by operating the adjusting lever 47 of the planting depth adjusting means 41, the operating force is transmitted through the link 113, the bracket 115 and the pin 116, and the pin 65 is It is configured to rotate about the center.

  When the arm 100 is rotated with the pin 98 as a fulcrum through the cam plate 90, the pin 91, the link 92, and the link 97 by the operation of the operation lever 85, the support is performed through the arm 103. The shaft 62 rotates to rotate the linkage arm 66 through the arm 63 and the pin 65 with the pin 116 as a pivot point. By the rotation of the linkage arm 66, the leveling means 52 can be moved in the vertical direction.

  As shown in FIGS. 3, 4, and 6 (b), when the operation lever 85 is operated toward the planting device 31, the arm 100 is pinned via the cam plate 90, the link 92, and the link 97. It rotates counterclockwise around 98. Then, the arm 103 rotates clockwise to rotate the support shaft 62 clockwise, and the linkage arm 66 rotates clockwise about the pin 116 via the arm 63 and the pin 65. Move. Then, the support rod 53 connected to the linkage arm 66 moves upward in FIG. 3, and the leveling means 52 can be moved to the non-working position.

  At the same time, the operating rod 76 is moved to the left in FIG. 3 via the cam plate 90, the link 108 and the arm 110, the clutch 73 is disengaged, and the transmission of power to the leveling means 52 is interrupted. .

  Further, as shown in FIGS. 4 and 6A, when the operation lever 85 is operated to the traveling machine body 11 side, the arm 100 pulls the pin 98 via the cam plate 90, the link 92, and the link 97. It rotates clockwise as the center. Then, the arm 103 rotates counterclockwise to rotate the support shaft 62 counterclockwise, and the linkage arm 66 counterclockwise around the pin 116 via the arm 63 and the pin 65. Rotate in the direction. Then, the support rod 53 connected to the linkage arm 66 moves downward, and the leveling means 52 can be moved to its working position.

  At the same time, the operating rod 76 is moved rightward in FIG. 4 via the cam plate 90, the link 108 and the arm 100, the clutch 73 is turned on, and power is transmitted to the leveling means 52.

  That is, by operating one operating lever 85, the vertical movement of the leveling means 52 and the power on / off of the leveling means 52 can be operated simultaneously, and the cage rotor 57 is moved to its raised position (non-working position). It is possible to prevent an operation error such as making the paddle idle, or moving the squirrel-cage rotor 57 while stopping the rotation at the lowered position (working position).

  As shown in FIG. 8, the leveling means 52 is in its working position, and the pin 106 is in the allowance 87 of the cam groove 88 as shown in FIG. Further, when the adjustment lever 47 is operated from the standard position to the shallow planting position close to the seedling platform 35, the shaft 42 is rotated clockwise through the arm 46, and the arm 112 is rotated clockwise. Rotate.

  The link 113 is pushed up by the arm 112, and the linkage arm 66 is rotated counterclockwise about the pin 65 via the bracket 115 and the pin 116. As the linkage arm 66 rotates counterclockwise, the leveling means 52 moves from the standard position to the shallow planting position.

  As shown in FIG. 9, when the adjustment lever 47 is operated from the standard position to the deep planting position that is separated from the seedling platform 35, the shaft 42 rotates counterclockwise via the arm 46. The arm 112 is rotated counterclockwise.

  The link 112 is pulled down by the arm 112, the linkage arm 66 is rotated via the bracket 115 and the pin 116, and the linkage arm 66 is rotated clockwise about the pin 65. By the clockwise rotation of the linkage arm 66, the leveling means 52 moves from the standard position to the deep planting position.

  At this time, the rotation of the linkage arm 66 is transmitted to the cam plate 90 via the arm 103, the arm 100, the link 97, and the link 92 as shown in FIG. However, as shown in FIG. 6A, since the pin 106 is engaged with the allowable portion 87 of the cam groove 88, no operating force acts on the pin 106, and the clutch 73 is affected. There is no.

  That is, when the vertical movement means 61 is operated by the operation lever 85, the linkage arm 66 rotates about the pin 116 (second pin) as a pivot point, and the planting depth is adjusted by the adjustment lever 47. When the adjusting means 41 and the height adjusting means 111 are operated, the pin 65 (first pin) is rotated about the pivot point.

  Since it is the said structure, when the planting apparatus 31 is supported by the traveling vehicle 11 and the planting work of a seedling does not need the leveling of a field surface, as shown in FIG. Operate to the planting device 31 side. Then, the leveling device 51 moves to a non-working position above the rice field. At the same time, the clutch 73 is disengaged, and the rotational driving of the cage rotor 57 is stopped.

  In this state, when the seedling is planted shallowly, the adjusting lever 47 of the planting depth adjusting means 41 is operated to the seedling setting table 35 side. Then, the arm 43 rotates clockwise through the shaft 42, and as shown in FIG. 3, the float 45 is pushed down (that is, the planting device 31 is moved away from the rice field), and the rice field ( The distance between the bottom surface of the float 45) and the planting rod 38 is set large. That is, by increasing the spacing between the planting ridges 38 for scraping the seedlings on the rice field and the seedling platform 35 and transplanting the seedlings on the rice field, the amount of invasion of the planting ridges 38 into the rice field is reduced, and the seedlings are planted shallowly. Can do.

  Further, when deeply planting seedlings, the adjusting lever 47 of the planting depth adjusting means 41 is operated to the traveling machine body 11 side (anti-seedling bed 35 side). Then, the arm 43 is rotated counterclockwise via the shaft 42 to raise the float 45 (that is, to lower the planting device 31 in the direction of approaching the rice field), and the distance between the rice field and the planting rod 38 is increased. Set to be smaller. That is, by reducing the distance between the rice field and the planting basket 38, the amount of the planting basket 38 entering the rice field can be increased, and the seedling can be deeply planted.

  When leveling of the paddy surface is necessary when planting seedlings, the operation lever 85 is operated toward the traveling machine body 11 as shown in FIG. Then, the leveling means 52 descends to a work position where the squirrel-cage rotor 57 is in contact with the paddy surface. At the same time, the clutch 73 is engaged and the squirrel-cage rotor 57 is driven to rotate.

  In this state, when the seedling is planted shallowly, the adjusting lever 47 of the planting depth adjusting means 41 is operated to the seedling setting table 35 side. Then, the arm 43 rotates clockwise through the shaft 42, and as shown in FIG. 3, the float 45 is pushed down (that is, the planting device 31 is moved away from the rice field), and the rice field ( The distance between the bottom surface of the float 40 and the planting rod 38 is set large. That is, by increasing the spacing between the planting ridges 38 for scraping the seedlings on the rice field and the seedling platform 35 and transplanting the seedlings on the rice field, the amount of invasion of the planting ridges 38 into the rice field is reduced, and the seedlings are planted shallowly. Can do.

  At this time, as shown in FIG. 8, the arm 112 rotates clockwise via the shaft 42, and the linkage arm 55 rotates counterclockwise via the link 113, and the ascending amount of the planting device 31 is increased. Accordingly, the leveling means 52 can be lowered, and the contact between the rice field and the cage rotor 57 can be ensured.

Further, when deeply planting seedlings, the adjusting lever 47 of the planting depth adjusting means 41 is operated to the traveling machine body 11 side (anti-seedling bed 35 side). Then, the arm 43 is rotated counterclockwise via the shaft 42 to raise the float 45 (that is, to lower the planting device 31 in the direction of approaching the rice field), and the distance between the rice field and the planting rod 38 is increased. Set to be smaller. That is, by reducing the distance between the rice field and the planting basket 38, the amount of the planting basket 38 entering the rice field can be increased, and the seedling can be deeply planted.

  At this time, as shown in FIG. 9, the arm 112 is rotated counterclockwise via the shaft 42, and the linkage arm 66 is rotated clockwise via the link 113. Therefore, the leveling means 52 can be raised only to secure contact between the rice field and the cage rotor 57.

  As described above, the leveling means 52 is moved up and down between the working position and the non-working position, and the operation for turning on and off the power transmission to the leveling means 52 is performed by one operating lever 85. At the same time when the means 52 is moved to the working position, the clutch 86 is engaged, and the leveling means 52 is in a driving state. Roughening of the rice field due to dragging can be prevented.

  Further, since the leveling means 52 can be adjusted in height by the adjustment lever 47 at the work position, the height adjustment of the leveling means 52 corresponding to the planting depth of the seedling can be easily performed by a simple operation with one adjustment lever 47. Therefore, appropriate leveling work can be performed easily and reliably.

  Further, the pin 65 of the vertical movement means 61 and the pin 116 of the height adjustment means 111 are connected to the linkage arm 66, and the adjustment by the vertical movement means 61 is performed using the second pin 116 on the height adjustment means 111 side as a pivot point. The height adjustment means 111 is adjusted by turning the linkage arm 66 about the first pin 65 on the vertical movement means 61 side as a pivot, thereby adjusting the leveling height by the vertical movement means 61 and the height adjustment means 111. Can be adjusted independently and smoothly without interfering with each other.

  Further, since the support shaft 62 of the arm 63 constituting the vertical movement means 61 and the pin 116 of the height adjustment means 111 are arranged substantially on one axis, the linkage arm 66 is controlled by the arm 63 of the vertical movement means 61. The pin 116 can be smoothly rotated about the fulcrum.

1 is a side view of an agricultural work vehicle according to the present invention. It is a top view of FIG. It is an enlarged side view of the leveling device in a non-working position. It is an enlarged side view of the leveling apparatus in a working position. It is a front view which shows arrangement | positioning in the operation means of a leveling apparatus. The operation state of the clutch in an operation means is shown, (a) is a side view which shows the time of clutch engagement operation, (b) is the time of clutch release operation. It is a top view of a height adjustment mechanism. It is an enlarged side view which shows the height adjustment state at the time of the shallow planting of a seedling. It is an enlarged side view which shows the height adjustment state at the time of deep planting of a seedling.

Explanation of symbols

11 traveling machine body 17 engine 31 planting device 41 planting depth adjusting means
47 Operation member 51 Leveling device
52 Leveling means 61 Vertical movement means 62 Support shaft (support shaft)
63 arm
64 connecting pin 65 first pin (pin)
66 Linking arm 81 Operating means 111 Height adjusting means 113 Arm (link)
116 Second pin (pin)

Claims (3)

A traveling machine body that is equipped with an engine and travels by the power of the engine;
A planting device supported by the traveling machine body so as to be movable up and down;
A leveling means which is vertical movement support to the traveling machine body in conjunction with arranged and lifting of the planting device between the traveling machine body and the planting device,
A vertical movement means for moving the leveling means up and down to a working position and a non-working position at a lowered position linked to a lowered position of the planting device;
In the agricultural work machine comprising the height adjusting means for adjusting the vertical position in the working position with respect to the planting device, the leveling means ,
A linkage pin having a connection pin connected to the leveling means, a first pin linked to the operation means of the vertical movement means, and a second pin linked to the operation member of the height adjustment means;
The linkage arm is rotated by the first pin with the second pin as a pivot point based on the operation of the operating means of the up-and-down moving means, and the leveling means is moved to the working position via the connection pin. Based on the operation of the operation member of the height adjusting means, the height adjusting means is moved up and down to a non-working position, and is pivoted about the first pin as a pivot point, and the leveling means via the connecting pin The vertical position in the working position is adjusted,
Agricultural work machine characterized by that. By adjusting the vertical position of the leveling means in the working position by operating the operation member of the height adjusting means, and adjusting the planting depth of the planting device,
The agricultural work machine according to claim 1. The vertical movement means includes an arm that is linked to the operation means and is rotatably supported by a frame of the planting device by a fulcrum shaft and is provided with the first pin at the tip.
The fulcrum shaft and the second pin of the arm are arranged in alignment on substantially one axis.
The agricultural work machine according to claim 1 or 2.

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