JP4866289B2 - Agricultural machine - Google Patents

Description

The present invention relates to a farm work machine capable of moving an operation part to an offset position opposite to that during normal work and performing an offset work while reversing its reverse relationship (reversing reverse) and moving a traveling machine backward . In particular, the present invention relates to an agricultural machine suitable for being used by being mounted on a small traveling machine body.

  A work machine that is mounted on a traveling machine body such as a tractor and performs various continuous linear operations in the field along the traveling direction of the traveling machine body is a general machine for agriculture or civil engineering, depending on the type of work There are various working machines. Among such working machines, offset working machines that work at positions offset laterally with respect to the traveling position of the traveling machine body are known as glazing machines, groove forming machines, mowing machines, etc. due to the special nature of the work. ing.

Among such offset working machines, in particular, in a hulling machine that performs a straight hulling work along the outer edge of a rectangular field, when the tip of the traveling machine body reaches the end of the field, Since the painting operation cannot be performed, there arises a problem that an unworked portion always remains at the corner of the rectangular field. In order to solve this problem, the fringing work part is moved to the offset position on the opposite side from that during normal work, and the front-rear relation is reversed (reverse reverse), so that the traveling machine body is in contact with the unworked part at the corner. A coater with reverse reversing mechanism has been developed that works while reversing . However, a conventional spreader equipped with a reverse mechanism has a universal joint between the mounting part and the work part so that power can be transmitted from the traveling machine body to the work part in both normal work and reverse work forms. Generally, a special power transmission mechanism is provided. For this reason, the length of the entire work machine is inevitably long, and there is no problem when it is used with a relatively large traveling machine that is heavy. When used, the weight balance tends to be lost, and there is a problem that the running becomes unstable and stable work cannot be performed.

Patent Document 1 describes a simplified power transmission mechanism between a mounting part and a working part by using a clutch as means for transmitting power from the mounting part to the working part. However, in the one described in Patent Document 1, an operation lever for connecting / disconnecting the clutch is required, and when the work is not performed, the working unit is rotated and deployed on the rear side and transported in a stored state. Since the center of gravity is greatly moved from the rear to the rear, there is a problem that it is difficult to use it by mounting it on a small traveling machine body. For this reason, the present applicant has previously proposed an inverted reverse farm work machine capable of stable work traveling even when mounted on a relatively light and small traveling machine body (see Patent Document 2 ).

As shown in FIG. 6 (plan view), the wrinkle coater 70 described in Patent Document 2 includes a main frame 71 attached to the rear portion of the connecting frame 11 connected to the traveling machine body so as to be rotatable up and down. The main frame 71 is provided with an offset mechanism 72 that forms a parallel link so as to be horizontally movable in the left-right direction, and a central portion of the rear frame 45 provided at a moving end (rear end) of the offset mechanism 72 is provided. A transmission frame 51 extending from the glazing operation unit 50 as a rotation fulcrum O is attached so as to be horizontally rotatable. Between the main frame 71 and the offset mechanism part 72, a manual work position adjusting screw 78 is provided that swings the offset mechanism part 72 in the left-right direction and horizontally moves the glazing work part 50.

  The main frame 71 is provided with a transmission shaft to which power from the input shaft 4 is transmitted, and a drive side clutch 73 is attached to the tip of the transmission shaft. A front input shaft case 74 and a rear input shaft case 75 are attached to one side surface and the other side surface of the front end portion of the transmission frame 51, and the front input shaft is rotatable in the front input shaft case 74. A rear input shaft is rotatably provided in the rear input shaft case 75. These input shafts are coupled to a power transmission mechanism provided in the transmission frame 51 so that the power transmitted to these input shafts is transmitted to the drape work unit 50.

  A front passive clutch 76 and a rear passive clutch 77 are attached to the front end portions of the front input shaft and the rear input shaft, and these clutches are configured to be connectable to the drive clutch 73.

Japanese Patent No. 2972534 JP 2004-305139 A

As shown in FIG. 7 (d) (plan view), in the conventional brush coater 70 described in Patent Document 2 , the coater working unit 50 is moved from the forward operation position Pf shown in FIG. 7 (a) (plan view) . In order to move to the reverse work position Pb, first, the work position adjusting screw 78 is rotated in the forward work position state shown in FIG. And the front passive clutch 76 are disconnected . Then, the work position adjusting screw 78 is further rotated to swing the offset mechanism 72 further to the left, so that the glazing work portion 50 is moved to the rear frame 45 as shown in FIG. 7B (plan view). The base coating portion 50 is moved to a position where the base end portion of the transmission frame 51 does not come into contact with the drive side clutch 73 when rotated. Then, at a position where the proximal end of the transmission frame 51 is not in contact with the drive side clutch 73, Ru rotate the ridge intermediate working section 50 about the rotation fulcrum O. By operating in this way, the working unit 50 is inverted 180 ° as shown in FIG. 7C (plan view) . Next, the working position adjusting screw 78 is rotated to swing the offset mechanism 72 to the right side, and the rear passive clutch 77 is changed to the driving clutch 73 as shown in FIG. 7D (plan view). The hooking work unit 50 is moved to the reverse work position Pb by being connected.

In this way, the reversing work for changing the working direction of the smearing work unit 50 includes the swing work of the offset mechanism part 72 for releasing the connection state between the drive side clutch 73 and the front side passive clutch 76, and the smearing work part 50. a rotating operation industry rotate to the opposite side, it is necessary to work three of rocking operation industry offset mechanism 72 for connecting the rear passive clutch 77 and the drive-side clutch 73, is complicated. In addition, since it is important to determine the position at which the rotating work is performed , this reversing work requires proficiency and has a problem that anyone cannot easily perform the reversing work.

  The present invention has been made in view of such problems, and an object thereof is to provide an agricultural machine that can be easily reversed without requiring an operator to learn how to reverse.

In order to solve such a problem, the present invention has the following features. One of the features is a mounting portion that is mounted on the traveling machine body, an offset mechanism portion that is swingable in the left-right direction on the mounting portion, and a rotation center that is provided on the moving end side of the offset mechanism portion. A transmission frame provided on a shaft (for example, the working unit rotating support shaft 52 in the embodiment) so as to be horizontally rotatable, and a working unit attached to the moving end side of the transmission frame (for example, a haze coating operation in the embodiment) Part 50), and when the working unit is moved to the forward working position on one side of the traveling machine body with the rotational center axis as the pivot point, the offset work can be performed while moving forward with the forward traveling of the traveling machine body, When the work unit is moved from the forward work position to the reverse work position by rotating about 180 °, the front-rear relationship of the work part is reversed, and an agricultural work machine capable of performing offset work while moving backward as the traveling machine body moves backward (for example, , Implementation form 1), two drive shafts arranged in parallel in the mounting portion in the horizontal direction and rotated by receiving the power from the traveling machine body, and provided on the transmission frame and capable of transmitting power to the working portion. A first driven shaft extending from one side surface of the frame (for example, the driven shaft 30 in the embodiment) and a second driven shaft extending from the other side surface of the transmission frame (for example, the driven shaft 30 in the embodiment), The first driven shaft and the second driven shaft are disposed on the moving end side of the transmission case with respect to the rotation fulcrum, and the rotation fulcrum of the working unit is disposed between the two drive shafts in a plan view during work, When the working unit moves to the forward working position, the tip of the first driven shaft is connected to one of the two drive shafts, and when the working unit moves to the reverse working position, the tip of the second driven shaft becomes the other of the two driving shafts. Characterized by being connected to To do.

According to this feature, the mounting portion is provided with two drive shafts that are rotated by receiving power from the traveling machine body, and the power transmission frame is provided on the transmission frame so that power can be transmitted to the working portion and extends from a side surface on one side of the transmission frame. A first driven shaft and a second driven shaft extending from the other side surface of the transmission frame, wherein the first driven shaft and the second driven shaft are disposed closer to the moving end of the transmission case than the rotation fulcrum, When the rotation fulcrum is arranged between the two drive shafts in plan view, when the working unit moves to the forward working position, the tip of the first driven shaft is connected to one of the two driving shafts, and the working unit is brought to the reverse working position. When the second driven shaft is moved, the tip portion of the second driven shaft is connected to the other of the two drive shafts, so that the work portion can be turned and the power can be transmitted from the traveling machine body to the working portion. Rotate around the pivot axis Only it may be working. For this reason, it is not necessary to learn reversing work, and it is possible to provide a farm machine that can easily perform reversing work of the working unit.

  One of the characteristics is that the rotation fulcrum of the working unit is arranged at the approximate center between the two drive shafts in a plan view during work.

  According to this feature, the two driving shafts are arranged symmetrically with respect to the pivoting fulcrum by arranging the pivoting fulcrum of the working unit at the approximate center between the two driving shafts in plan view during work. The structure of the mechanism for reversing the working part is clarified, the reversing work of the working part is easily understood, and the reversing work can be performed more easily.

  One of the characteristics is that the first driven shaft and the second driven shaft are arranged on the same axis.

  According to this feature, by arranging the first driven shaft and the second driven shaft on the same axis, the first driven shaft is driven when the working unit is turned to the forward working position side about the turning fulcrum. By connecting to one of the shafts and rotating the working part to the reverse working position side around the rotation fulcrum, the second driven shaft can be connected to the other of the drive shafts, and these connections can be made easily and reliably. Can be done.

  One of the features is that the first driven shaft and the second driven shaft are the same axis.

  According to this feature, since the first driven shaft and the second driven shaft are the same axis, the first driven shaft and the second driven shaft can be a single axis. For this reason, the structure of the driven shaft is simplified, and the number of parts of the reversing structure of the working unit is reduced, so that the cost of the agricultural machine can be reduced.

  One of the features is that the distance between the two drive shafts is equal to the difference between the offset amount of the working unit moved to the forward working position and the offset amount of the working unit moved to the reverse working position.

  According to this feature, the distance between the two drive shafts is made equal to the difference between the offset amount of the working unit moved to the forward working position and the offset amount of the working unit moved to the backward working position, so that The offset amount of the working unit can be set according to the distance between the two drive shafts, and the offset amount of the working unit during reverse operation can be arbitrarily set within a range in which the two drive shafts can be arranged. .

  Further, one of the features is that the working unit is a hulling working unit including a preprocessing unit and a trimming unit.

  According to this feature, by setting the working unit as a hulling work unit including a pre-processing unit and a trimming unit, the reversing work of the hulling work unit is easy, and learning of the reversing work of the working unit is unnecessary. The structure of the reversing mechanism for reversing the working part can be clarified, the drive shaft and the driven shaft can be connected easily and reliably, the structure of the driven shaft is simplified, and the number of parts of the reversing structure of the working part is reduced. It is possible to provide a farm work machine including a padding work section that can be reduced and can arbitrarily set an offset amount of the work section during reverse work within a range in which two drive shafts can be arranged.

  According to the agricultural machine according to the present invention, by having the above features, it is possible to provide an agricultural machine that can easily perform the reversing operation of the working unit without requiring the operator's skill.

  Hereinafter, a preferred embodiment of an agricultural machine according to the present invention will be described with reference to FIGS. In the present embodiment, a plastering machine, which is an example of an agricultural machine, will be described. For convenience of explanation, the directions of arrows shown in FIG. 1 (plan view) will be described below as the front-rear direction and the left-right direction.

  As shown in FIG. 1 and FIG. 2 (left side view), the spreader 1 is connected to a three-point link connecting mechanism (not shown) provided at the rear portion of the traveling machine body 90 so that the traveling machine body 90 moves forward. The paintwork is performed according to the movement and the backward movement. The hull coater 1 is provided with an input shaft 4 that is mounted on the traveling machine body 90 and receives power from the traveling machine body 90 and has a mounting part 10 whose rear side can swing in the left-right direction, and a moving end side of the mounting part 10 It has a glazing operation unit 50 that is disposed so as to be rotatable in a horizontal direction around a rotation fulcrum O provided on the (rear end side) and performs a glazing operation.

The mounting portion 10 includes a main frame 13 and a main frame 13 that are attached to the rear side of the connection frame 11 and the connection frame 11 via a pair of support arms 12 and 12 ′. And an offset mechanism portion 40 attached so as to be swingable in the left-right direction. The input shaft 4 described above is provided at the lower center of the connecting frame 11 in the left-right direction. The input shaft 4 is configured to transmit power from a PTO shaft (not shown) of the traveling machine body 90 via a transmission shaft (not shown). A pair of support arms 12, 12 ′ protruding rearward at a predetermined interval in the left-right direction are attached to the rear end side of the connecting frame 11 so as to be rotatable in the vertical direction. The main frame 13 is fixed to the rear end portion of '. The main frame 13 extends substantially symmetrically with the support arms 12 and 12 'as the center. An attachment frame 15 extending along the main frame 13 is fixed.

  The offset mechanism unit 40 is rotatably attached to the attachment frame 15. The mounting frame 15 is attached to the main frame 13 so as to be shifted to the left side with respect to the input shaft 4. The mounting frame 15 is disposed at a left and right end portions of the mounting frame 15 with a predetermined interval in the vertical direction and rearward. A pair of upper and lower left protrusions 16, 16 'and right protrusions 17, 17' extending to the side are provided. A support shaft 18 that protrudes upward is provided at the tip of the right protrusion 17, and the front end of the first link member 41 is pivoted to the top of the support shaft 18, and the rear end of the first link member 41 is The rear frame 45 is pivotally connected to the moving mechanism side of the offset mechanism 40.

A support shaft 20 is attached to the front ends of the left projecting portions 16 and 16 ′ and extends in the vertical direction. The second support shaft 20 is arranged along the first link member 41 on the upper portion of the support shaft 20. The front end portion of the link member 42 is pivotally connected, and the rear end portion of the second link member 42 is pivotally connected to the rear frame 45. Further, the front end portion of the third link member 43 is pivotally connected to the lower portion of the support shaft 20, and the rear end portion of the third link member 43 is pivotally connected to the lower portion on the proximal end side of the transmission frame 51 extending from the glazing operation portion 50. ing. The mounting frame 15, the first link member 41, the second link member 42, the third link member 43 and the rear frame 45 constitute a parallel link mechanism. The smearing work unit 50 is rotated in the vertical direction by a work posture adjusting screw 47 provided between the connecting frame 11 and the main frame 13 so that the work posture of the hulling work unit 50 can be adjusted. .

The offset mechanism unit 40 is configured to move the smearing work unit 50 to the right side of the traveling machine body 90 and move it forward so that the work can be performed while moving forward, and the smearing work unit 50 is positioned behind the mounting unit 10. The storage position to be moved and stored, and the smearing work section 50 is rotated by approximately 180 ° from the forward work position and is offset to the left side of the traveling machine body 90 and can be moved to the reverse work position where the smearing work can be performed while moving backward. If it is, it is not limited to a parallel link mechanism, but is a combination of a link mechanism and a slide mechanism, or a structure in which the glazing operation part 50 is attached to a mounting part via a member that is rotatable in the horizontal direction. But you can.

A transmission frame 51 extends in the glazing operation portion 50, and a pair of operation portion rotation support shafts 52 and 53 extending in the vertical direction are provided on the upper and lower surfaces of the transmission frame 51 on the base end side . The working portion rotation support shafts 52 and 53 are coaxially disposed, and the upper work portion rotation support shaft 52 is rotatably attached to the left end portion of the rear frame 45 and the second link member 42. Is connected to the rear end of the rear end of the rear end. The lower working portion rotation support shaft 53 is rotatably connected to the rear end portion of the third link member 43. The rotation center axes of the working unit rotation support shafts 52 and 53 are arranged coaxially with the pivoting portion of the second link member 42 pivoted to the rear frame 45. That is, the wrinkle coating unit 50 can be rotated in the horizontal direction with the central axis of the pair of operation unit rotation support shafts 52 and 53 as the rotation fulcrum O, and the forward operation position and the forward movement offset to the right side of the traveling machine body 90. It is possible to move to a reverse work position rotated approximately 180 ° from the work position, and an intermediate storage position thereof.

  Two drive shafts 22 and 23, which are arranged at a predetermined distance in the left-right direction and extend horizontally to the rear side, are attached to the middle portion of the main frame 13 so as to be rotatable. The drive shaft 22 is disposed almost directly behind the input shaft 4 so that power from the input shaft 4 can be transmitted through the universal joint 24 and the like. The drive shaft 23 is configured such that the power transmitted to the drive shaft 22 is transmitted via the drive shaft 22 and gears 25 and 26 attached to the drive shaft 23. For this reason, when power is transmitted to the drive shaft 22, power is also transmitted to the drive shaft 23, and both the drive shafts 22 and 23 rotate. A front drive clutch 27 is attached to the front end of the drive shaft 22, and a rear drive clutch 28 is attached to the front end of the drive shaft 23. The drive shafts 22 and 23 extend from the main frame 13 to the rear side with substantially the same distance, and the front drive clutch 27 and the rear drive clutch 28 are positioned at the substantially same distance from the main frame 13 to the rear side. Has been placed. The distance in the left-right direction between the drive shafts 22 and 23 will be described later.

The transmission frame 51 is box-shaped and extends in the left-right direction, and a work main body portion 54 for performing a haze coating operation is attached to the moving end side . At the base end portion of the transmission frame 51, a driven shaft 30 extending in the front-rear and horizontal directions at a position closer to the moving end side than the rotation support shaft 52 is rotatably supported. The driven shaft 30 is provided so as to penetrate the transmission frame 51 and extends from the front side surface and the rear side surface of the transmission frame 51 with substantially the same length. A front passive clutch 31 is attached to the front end portion of the driven shaft 30, and a rear passive clutch 32 is attached to the rear end portion of the driven shaft 30. The front passive clutch 31 is configured to be connectable to the front drive clutch 27, and the rear passive clutch 32 is configured to be connectable to the rear drive clutch 28. Then , normal operation (forward operation) is performed with the front passive clutch 31 connected to the front drive clutch 27, and reverse operation (reverse operation) is performed with the rear passive clutch 32 connected to the rear drive clutch 28. Therefore, the rotation fulcrum O of the glazing operation unit 50 is configured to be disposed at the approximate center between the two drive shafts 22 and 23 in plan view.

The driven shaft 30 is not limited to a single shaft, as long as the power from the drive shafts 22, 23 can be transmitted to the front passive clutch 31 or the rear passive clutch 32. The front passive clutch is not limited to a single shaft. The shaft portion to which 31 is attached and the shaft portion to which the rear passive clutch 32 is attached may be provided individually at the tip end portion of the transmission frame 51, and these shaft portions may be arranged coaxially.

  A power transmission mechanism (not shown) is provided in the transmission frame 51, and this power transmission mechanism is configured to transmit power from the front passive clutch 31 and the rear passive clutch 32 to the work main body 54.

  The work main body portion 54 includes a pre-processing unit 55 that cuts the old ridge formed along the periphery of the field and deposits the soil, and a trimming unit 57 that applies the piled soil on the crushed old ridge. It becomes.

  The pretreatment unit 55 includes a tilling rotor that is rotatably supported. The tilling rotor is connected to and supported by the transmission frame 51, and the power from the driven shaft 30 is transmitted via a power transmission mechanism in the transmission frame 51. It has come to be. The trimming unit 57 includes a polyhedral drum 58 that is rotatably supported. The polyhedral drum 58 is connected to and supported by the transmission frame 51 so that power from the driven shaft 30 can be transmitted through a power transmission mechanism in the transmission frame 51.

3 to 5 are explanatory views of the movement state of the hulling work unit 50, FIG. 3 shows a state where the hulling work unit 50 is in the forward work position, and FIG. 4 shows the offset mechanism 40 in the forward work position. FIG. 5 shows a state in the middle of moving to the reverse operation position while unlocking the rotation of the smearing work unit 50 while maintaining the state where the swing of the work is locked. FIG. It is explanatory drawing which showed the state rotated to the working position.

In the case where the smearing work unit 50 of the smearing machine 1 configured as described above is moved from the forward work position Pf shown in FIG. 3 to the reverse work position Pb shown in FIG. 5 , first, as shown in FIG. In a state where the smearing work unit 50 is located at the forward work position Pf, the locking device is operated to release the rotation lock state of the smearing work part 50 with respect to the rear frame 45. Then, when the worker rotates the wrinkle coating portion 50 about the rotation fulcrum O to the opposite side to the forward operation position Pf , the front passive clutch 31 is centered on the rotation fulcrum O as shown in FIG. It is rotated in the same direction as the rotation direction of the haze application portion 50 and is detached from the front drive clutch 27. Then, when the smearing work part 50 further moves to the reverse work position Pb side, as shown in FIG. 5, the front and back relations of the hulling work part 50 are reversed, and the rear passive clutch 32 is moved to the front side. It will be in the state of facing and connected to the rear drive clutch 28. At the same time, the locking device is activated to lock the rotation of the hulling work unit 50 with respect to the rear frame 45, and the movement of the hulling work unit 50 to the reverse work position Pb is completed. It should be noted that even when the hulling work unit 50 is moved from the reverse work position Pb to the forward work position Pf, it is only necessary to rotate the hulling work part 50 with respect to the rear frame 45. Since it is based on the operation of moving from the position Pf to the reverse operation position Pb, description thereof is omitted.

As described above, when the hulling work unit 50 is moved from the forward work position Pf to the reverse work position Pb or from the reverse work position Pb to the forward work position Pf, only the rotation operation with respect to the rear frame 45 of the hulling work part 50 is performed. Thus, the front passive clutch 31 can be connected to the front drive clutch 27 or the rear passive clutch 32 can be connected to the rear drive clutch 28, so that the glazing operation portion 50 can be easily reversed. For this reason, it is possible to eliminate the need for mastering the reversing work of the hull coating unit 50. Further, when moving (during non-working), the smearing working unit 50 is simply moved in the left-right direction from the forward working position Pf to the retracted position by the offset mechanism 40, and the center of gravity moves little in the front-rear direction. In particular, when mounted on a small traveling machine body, it is possible to travel stably.

Here, the offset amount Xr of the smearing work unit 50 moved to the reverse work position Pb shown in FIG. 5 is larger than the offset amount Xf of the smearing work part 50 moved to the forward work position Pf shown in FIG. Is set to This difference ΔX = (Xr−Xf) in the offset amount corresponds to the distance D between the two drive shafts 22 and 23 in plan view. Therefore, when it is desired to make the offset amount Xr of the smearing work unit 50 in the reverse work larger than the offset amount Xf of the smearing work unit 50 moved to the forward work position Pf by a desired distance (for example, Y), 2 The distance between the two drive shafts 22, 23 may be set to Y. That is, within the range in which the two drive shafts 22 and 23 can be arranged, the offset amount Xr of the glazing operation unit 50 during the reverse operation can be arbitrarily set.

  In the above-described embodiment, the case where the swinging of the offset mechanism unit 40 and the rotation of the smearing work unit 50 are performed manually is shown. However, the offset mechanism unit 40 and the smearing work are performed by an electric or hydraulic actuator. The part 50 may be moved. In the above-described embodiment, a case where a paddy coater is targeted as an example of a farm work machine is shown, but a trench excavator may be targeted.

The top view of the glazing machine in the storage state concerning one embodiment of the present invention is shown. The left side view of this wrinkle coater is shown. The top view of the hulling machine in the state which the haze coating operation part moved to the advance work position is shown. The top view of the hulling machine for demonstrating the state in the middle of the movement which reverses a hulling work part is shown. The top view of the hull coater in the state which the haze coating operation part moved to the reverse work position is shown. The top view of the conventional glazing machine is shown. The top view of the glazing machine for demonstrating the operation | movement which reverses the glazing operation part of the conventional glazing machine is shown.

Explanation of symbols

1 Spider coater (agricultural machine)
10 mounting part 22, 23 drive shaft 30 driven shaft (first driven shaft, second driven shaft)
50 Haze coating work part (work part)
51 Transmission frame 52 Working part rotation support shaft (rotation center axis)
55 Pre-processing part 57 Adjusting part 90 Traveling machine body Pb Reverse work position Pf Forward work position

Claims (6)

A mounting part to be mounted on the traveling machine body, an offset mechanism part provided on the mounting part so as to be swingable in the left-right direction, and a pivotable central axis provided on the moving end side of the offset mechanism part. a transmission frame provided, and a working unit which is attached to the moving end of said transmission motion frame, the working portion of the rotational center axis as a rotation fulcrum on one side forward work position of the traveling machine body When it is moved, offset work is possible while moving forward as the traveling machine moves forward, and when the working part is moved to a backward working position rotated by approximately 180 ° from the forward working position, In the agricultural machine capable of offset work while reversing with the reverse traveling of the traveling machine body and the relationship is reversed,
Two drive shafts arranged side by side in the mounting portion in the horizontal direction and rotated by receiving power from the traveling machine body, and provided on the transmission frame and capable of transmitting power to the working portion, and one of the transmission frames A first driven shaft extending from a side surface on the side and a second driven shaft extending from a side surface on the other side of the transmission frame, wherein the first driven shaft and the second driven shaft are more than the rotation fulcrum. The rotating fulcrum of the working part is disposed between the two drive shafts in plan view during work, and the first driven when the working part moves to the forward working position. The tip of the shaft is connected to one of the two drive shafts, and the tip of the second driven shaft is connected to the other of the two drive shafts when the working portion moves to the reverse working position. Agricultural working machine.   2. The agricultural working machine according to claim 1, wherein the rotation fulcrum of the working unit is disposed at a substantially center between the two drive shafts in a plan view during work.   The farm work machine according to claim 1 or 2, wherein the first driven shaft and the second driven shaft are disposed on the same axis.   The farm work machine according to claim 3, wherein the first driven shaft and the second driven shaft are the same shaft.   The distance between the two drive shafts is equal to a difference between an offset amount of the working unit moved to the forward working position and an offset amount of the working unit moved to the reverse working position. An agricultural machine according to any one of the above.   The agricultural working machine according to any one of claims 1 to 5, wherein the working unit is a cocoon coating working unit including a pre-processing unit and a trimming unit.

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