Farm field work machine

Abstract

To perform posture change of an arch part easily.SOLUTION: A farm field work machine includes: a machine body; a work device for supplying materials to a farm field; a support frame 11 extending upward from the machine body; an arch part 13 that is connected to the support frame 11 and can change its posture to a use posture in which it protrudes upward from the support frame 11 and a storage posture lower than the use posture; and buffer means 20 for suppressing the force when the arch part 13 changes its postures from the use posture to the storage posture.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a farm work machine in which the position of an arch portion can be changed. [Background technology]

[0002] An arch section provided on a rice transplanter (field working machine) supports electronic devices such as a positioning unit, a receiving device, and a communication device. As disclosed in Patent Document 1, the arch section may be configured to be able to change its position in order to reduce the outer diameter size of the machine body when storing and transporting the rice transplanter (field working machine). Changing the position of such an arch section is generally performed manually by an operator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-108605 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the worker needs to change the position of the arch portion while supporting the arch portion, and there is a demand for changing the position of the arch portion easily and simply.

[0005] An object of the present invention is to easily change the posture of the arch portion. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a field work machine according to one embodiment of the present invention comprises a body, a work device for supplying materials to a field, a support frame extending upward from the body, an arch portion connected to the support frame and capable of changing its position to a use position in which it protrudes upward from the support frame and a storage position which is lower than the use position, and a cushioning means for suppressing the momentum of the arch portion when it changes position from the use position to the storage position.

[0007] With this configuration, the buffer means can suppress the speed at which the arch portion changes position when it is changed from the use position to the storage position. Therefore, the momentum of the arch portion when it is changed position (folded) is suppressed, and the effort required of the worker to support the arch portion is reduced. As a result, the worker can easily and simply manually change the position of the arch portion.

[0008] The arch portion may swing along an axis extending in the left-right direction of the aircraft body to change its position, and the buffer means may be a damper provided between the support frame and the arch portion.

[0009] With this configuration, the damper is compressed when the arch portion swings downward from the use position to the storage position, and the repulsive force suppresses the momentum of the swing of the arch portion. As a result, even with a simple configuration, the operator can easily and conveniently manually change the position of the arch portion.

[0010] The shoe may further include a locking mechanism capable of restricting changes in the position of the arch portion.

[0011] With this configuration, the locking mechanism restricts the arch portion from changing its position, and the arch portion can change its position only when the locking mechanism is released. This prevents the arch portion from changing its position unexpectedly, and allows the worker to change the position of the arch portion appropriately.

[0012] The locking mechanism may include a support stay fixed to the support frame and supporting the arch portion, a lever, and a biasing member, the lever having a lever main body and a first protruding shaft and a second protruding shaft protruding from both ends of the lever main body, the support stay having a first hole portion and a second hole portion, the lever being capable of swinging along the first protruding shaft and moving parallel to the axial direction of the first protruding shaft when the first protruding shaft is inserted into the first hole portion, the lever being displaced, by the parallel movement, between a restricted state in which the second protruding shaft is inserted into the second hole portion and penetrates the arch portion to restrict a change in posture of the arch portion, and a released state in which the second protruding shaft is extracted from the arch portion to allow a change in posture of the arch portion, and the biasing member may bias the lever in a direction of displacing from the released state to the restricted state.

[0013] With this configuration, the worker can easily operate the locking mechanism and appropriately change the position of the arch portion.

[0014] The seat belt may further include an elastic member provided between the arch portion in the stored position and the support frame.

[0015] With this configuration, when the arch portion changes position from the use position to the storage position, the elastic member receives the arch portion and can absorb the impact when the arch portion collides with the support frame.

[0016] In addition, the support frames may be provided in a pair, the arch portion may be provided across the pair of support frames, and may have an arch main body portion, a first arch portion protruding from the arch main body portion and supported by one of the support frames, and a second arch portion protruding from the arch main body portion and supported by the other support frame, and the damper may be provided across one of the support frames and the first arch portion.

[0017] With this configuration, despite the simple structure, the worker can manually change the position of the arch portion easily and simply.

[0018] In addition, the support frames may be provided in a pair, the arch portion may be provided across the pair of support frames, and may have an arch main body portion, a first arch portion protruding from the arch main body portion and supported by one of the support frames, and a second arch portion protruding from the arch main body portion and supported by the other support frame, and the locking mechanism may be provided on the first arch portion.

[0019] With this configuration, despite the simple structure, the worker can manually change the position of the arch portion easily and simply.

[0020] The damper may further include a damper support part fixed to the support frame, a long hole provided in the damper support part, and a damper support shaft passing through the long hole so as to be movable along the long hole, and one end of the damper may be supported by the damper support shaft.

[0021] When the arch portion changes position from the use position to the dead point, the damper is compressed and suppresses the momentum of the arch portion when changing position. However, when the arch portion changes position beyond the dead point to the storage position, the repulsive force of the damper increases the momentum of the arch portion when changing position.

[0022] According to the above configuration, when the arch portion changes its position from the use position to a position beyond the dead point, one end of the damper moves along the long hole due to the repulsive force of the damper, and the compressed damper expands. This causes the repulsive force of the damper to disappear or decrease, and the momentum of the arch portion when changing its position is suppressed. As a result, the operator can manually change the position of the arch portion easily and simply.

[0023] The storage bag may further comprise a cushioning means for urging the arch portion in a direction opposite to that of the cushioning means, the cushioning means being activated at a predetermined time during the change in position of the arch portion from the use position to the storage position.

[0024] With this configuration, while the arch portion is changing its position from the use position to the storage position, the cushioning means suppresses the momentum of the arch portion when changing its position. Therefore, even if the momentum of the arch portion when changing its position is increased by the damper, the cushioning means can suppress this momentum. As a result, the operator can easily and simply manually change the position of the arch portion.

[0025] The cushioning means may be an elastic body.

[0026] With this simple configuration, the momentum of the arch portion when it is changing its position can be suppressed, and the worker can easily and simply manually change the position of the arch portion. [Brief description of the drawings]

[0027] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] 10A to 10C are side views illustrating the configuration of a damper provided in an arch portion and a change in the posture of the arch portion. [Figure 4] 13 is a right side view illustrating a main configuration of the support stay that supports the arch portion that changes its posture. FIG. [Diagram 5] FIG. 4 is a front view illustrating a main configuration of the support stay. [Figure 6] FIG. 4 is a plan view illustrating a configuration of a main part of the support stay. [Figure 7] 11A and 11B are diagrams illustrating the action of a damper before and after a dead point. [Figure 8] 10A and 10B are diagrams illustrating an example of the configuration of a coil spring that is a buffer means. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, a rice transplanter that plants seedlings (corresponding to materials) in a field will be described with reference to the drawings as an example of a field work machine that supplies materials to a field.

[0029] In the following explanation, unless otherwise specified, "front" (the direction of arrow F in each figure) means the front in the longitudinal direction (travel direction) of the aircraft, and "rear" (the direction of arrow B in each figure) means the rear in the longitudinal direction (travel direction) of the aircraft. In addition, the left-right or lateral direction refers to the transverse direction of the aircraft (aircraft width direction) perpendicular to the longitudinal direction of the aircraft, that is, "left" (the direction of arrow L in each figure) and "right" (the direction of arrow R in each figure) mean the leftward and rightward directions of the aircraft 1, respectively.

[0030] [Overall structure] 1 and 2, the rice transplanter is a riding type four-wheel drive machine body 1. The machine body 1 is equipped with wheels 2, a working device, a spare seedling storage device 4, and a driving section 5.

[0031] The work implement is a seedling planting device 7, which may also include a fertilizer applicator 8 and a chemical sprayer 9. The seedling planting device 7 plants (supplies) seedlings, which are an example of a material, in a field. The fertilizer applicator 8 supplies fertilizer, which is an example of a material, to the field. The chemical sprayer 9 sprays (supplies) chemicals, which are an example of a material, in the field. The driver's section 5 is provided in the rear area of ​​the machine body 1, and an operator (driver) rides on board.

[0032] The spare seedling storage device 4 stores spare seedlings. The spare seedling storage device 4 is supported by a spare seedling support frame 11 provided on the machine body 1. Specifically, the spare seedling support frame 11 is U-shaped with a horizontal portion 11t at its upper end. The spare seedling support frames 11 are provided upright on the machine body 1 in front of the driving unit 5, in a pair on the left and right sides. The left and right spare seedling support frames 11 each support a plurality of spare seedling storage devices 4.

[0033] [Arch section] As shown in Figs. 1 to 3, the arch portion 13 is connected to the spare seedling support frame 11. Specifically, the arch portion 13 is provided across a pair of spare seedling support frames 11. The arch portion 13 has an arch main body portion 13m and a first arch portion 13a and a second arch portion 13b protruding from both ends of the arch main body portion 13m. The end regions of the first arch portion 13a and the second arch portion 13b on the opposite side to the arch main body portion 13m become connection portions 13t extending in a direction different from that of the first arch portion 13a and the second arch portion 13b. For example, the connection portions 13t are formed by bending the ends of the first arch portion 13a and the second arch portion 13b. The first arch portion 13a is supported by the left (one) spare seedling support frame 11 at the connection portion 13t, and the second arch portion 13b is supported by the right (other) spare seedling support frame 11 at the connection portion 13t, so that the arch portion 13 is supported by the spare seedling support frame 11. For example, the connecting portion 13t is supported by the horizontal portion 11t.

[0034] Electronic devices such as a positioning unit 15 and a receiving device / communication device are supported on the arch portion 13. The positioning unit 15 outputs positioning data for calculating the position and orientation of the aircraft 1. The electronic devices such as the positioning unit 15 are supported on an arch main body portion 13m of the arch portion 13.

[0035] The arch portion 13 can be changed to a use position in which it protrudes upward from the spare seedling support frame 11, and a storage position in which it is lower than the use position. In Fig. 3, the arch portion 13 in the use position is shown by a two-dot chain line, and the arch portion 13 in the storage position is shown by a solid line. In Fig. 3, the spare seedling storage device 4 and the like are omitted.

[0036] Electronic devices such as the positioning unit 15 supported by the arch portion 13 need to be placed as high as possible in order to transmit and receive radio waves. Therefore, the arch portion 13 in the usage position is configured so that the arch main body portion 13m is placed as high as possible above the spare seedling support frame 11. When storing or transporting the rice transplanter, it is convenient if the outer diameter of the rice transplanter is small. Therefore, by changing the position of the arch portion 13 to the storage position, the height that it protrudes above the spare seedling support frame 11 is suppressed.

[0037] For example, as shown in Fig. 3, the arch portion 13 changes its position by swinging along an axis P1 extending in the left-right direction of the vehicle body 1. The axis P1 is provided in the front region of the connection portion 13t, and the arch portion 13 in the stored position can be changed to face downward relative to the connection portion 13t. The arch portion 13 in the stored position may be changed to face upside down relative to the use position, but it is sufficient that the position is changed so that the upper end of the arch portion 13 is lower than in the use position. Furthermore, the position of the arch portion 13 is not limited to being changed by swinging, and may also be changed by sliding up and down.

[0038] [Support stay] As shown in Figures 3 to 6, the spare seedling support frame 11 is equipped with support stays 18 that support the arch portion 13. The support stays 18 are provided for each of the left and right spare seedling support frames 11 and are fixed to the horizontal portions 11t of the left and right spare seedling support frames 11. The support stays 18 support the arch portion 13 so that it can swing along the axis P1.

[0039] For example, the support stay 18 extends in the front-rear direction of the vehicle body 1 and includes two side plates 18s that face each other. The support stay 18 also includes a swing shaft 18p that is provided across the two side plates 18s. The arch portion 13 includes a hollow bearing sleeve 13p that penetrates the connection portion 13t. The arch portion 13 is supported by the support stay 18 in a manner in which the swing shaft 18p is inserted into the bearing sleeve 13p. The bearing sleeve 13p slides along the swing shaft 18p, causing the arch portion 13 to swing along the axis P1 of the swing shaft 18p. As the arch portion 13 swings, the arch portion 13 changes its position between a use position and a storage position.

[0040] [Damper] The position of the arch portion 13 is changed manually by an operator. When the arch portion 13 is changed from the use position to the storage position, the operator supports the arch portion 13 and swings the arch portion 13 in a direction to lower the arch main body portion 13m of the arch portion 13. If the arch portion 13 swings forcefully at this time, the burden on the operator increases.

[0041] Therefore, as shown in Figs. 3 to 6, a damper 20, which is a shock absorbing means, is provided between the spare seedling support frame 11 and the arch portion 13. The damper 20 is provided between the left spare seedling support frame 11 and the first arch portion 13a. The damper 20 is compressed as the arch portion 13 changes its position from the use position to the storage position, and a force (repulsive force) is generated in a direction that prevents the arch portion 13 from changing its position to the storage position. This repulsive force allows the damper 20 to suppress the momentum of the position change when the arch portion 13 changes its position from the use position to the storage position, and to assist the worker in supporting the arch portion 13. As a result, the force required for the worker to support the arch portion 13 when changing the position of the arch portion 13 from the use position to the storage position is suppressed, and the worker can easily and simply manually change the position of the arch portion 13.

[0042] In order to compress the damper 20 in accordance with the change in attitude, one end of the damper 20 is supported at a position offset from the axis P1. For example, one end of the damper 20 is supported behind the oscillation shaft 18p of the support stay 18.

[0043] Specifically, the support stay 18 supported (fixed) to the left spare seedling support frame 11 has a damper support part 21 that supports a damper 20. The damper support part 21 extends in the front-rear direction of the machine body 1 and has two side plates 21s and a damper support shaft 21p that are provided facing each other. The side plates 21s have a long hole 21h that is long in the front-rear direction of the machine body 1, and the damper support shaft 21p is supported across the long holes 21h of the two side plates 21s so as to be movable in the front-rear direction within the long hole 21h. One end of the damper 20 is supported by the damper support shaft 21p so as to be swingable along the damper support shaft 21p, and the other end of the damper 20 is supported by the first arch part 13a so as to be swingable along the axis of the machine body 1 in the left-right direction. The left side plate 21s extends downward and is supported by the support stay 18, thereby being supported by the spare seedling support frame 11.

[0044] [Lock mechanism] The arch portion 13 is equipped with a locking mechanism 23 capable of restricting a change in posture of the arch portion 13. The locking mechanism 23 is configured to be capable of being in a restricting state in which the change in posture of the arch portion 13 is restricted, and in a released state in which the change in posture of the arch portion 13 is permitted. The locking mechanism 23 is provided on the left support stay 18.

[0045] The lock mechanism 23 includes a lever 24, a spring 23s which is a biasing member, a first hole 23a and a second hole 23b provided in the support stay 18, and a hole 21a in the damper support portion 21.

[0046] The first hole 23a and the second hole 23b are provided in the two side plates 18s of the support stay 18. The hole 21a is provided in the side plate 21s of the damper support portion 21. The two first holes 23a provided in the two side plates 18s and the hole 21a provided in the side plate 21s are provided in positions that overlap in a side view. The two second holes 23b provided in the two side plates 18s are provided in positions that overlap in a side view. The first hole 23a is provided in a lower region in the central region in the front-rear direction of the side plate 18s. The second hole 23b is provided forward and above the first hole 23a of the side plate 18s. Further, in the hole 21a of the left side plate 21s of the damper support portion 21, a hollow shaft cylinder 24p is provided, one end of which contacts the right side plate 18s and the other end of which protrudes to the right from the side plate 21s.

[0047] The lever 24 is a U-shaped rod and has a lever main body 24m and a first protruding shaft 24a and a second protruding shaft 24b protruding from both ends of the lever main body 24m. When the first protruding shaft 24a is inserted into the two first hole portions 23a and the shaft tube 24p from the right side, the lever 24 is supported by the first hole portions 23a and the shaft tube 24p so as to be swingable along a left-right axis P2 of the first protruding shaft 24a.

[0048] A hollow cylinder portion 13c penetrating the connection portion 13t is provided in a portion of the connection portion 13t of the arch portion 13 forward of the bearing sleeve 13p. The second protruding shaft 24b is inserted from the right side so as to be insertable into and removable from the second hole portion 23b and the cylinder portion 13c of the two side plates 18s. In other words, the lever 24 can insert and remove the second protruding shaft 24b from the cylinder portion 13c of the arch portion 13 by moving parallel to the left and right direction (the axial direction of the first protruding shaft 24a), and can also swing along the axis P2 of the first protruding shaft 24a.

[0049] The first protruding shaft 24a includes a spring 23s and a stop plate 24s. The spring 23s is provided so as to wrap around the first protruding shaft 24a in a spiral shape, with one end fixed to the left side plate 21s of the damper support portion 21 and the other end supported by the stop plate 24s. The stop plate 24s is capable of adjusting the position at which it supports the spring 23s, and by adjusting the supporting position, it is possible to adjust the length of the spring 23s between the side plate 21s and the stop plate 24s, and thereby adjust the tension of the spring 23s.

[0050] The size of the first hole 23a is larger than the outer shape of the stop plate 24s, and the size of the hole 21a is smaller than the outer shape of the stop plate 24s. Therefore, even if the lever 24 is moved to the right, the stop plate 24s abuts against the left side plate 21s of the damper support part 21, and the first protruding shaft 24a cannot be pulled out from the shaft tube 24p. In addition, the first protruding shaft 24a is biased by the spring 23s in the direction in which the lever 24 is inserted (to the left).

[0051] The size of the second hole portion 23b is larger than the outer shape of the second protruding shaft 24b. Therefore, the second protruding shaft 24b can be removed from the support stay 18 and the cylindrical portion 13c of the arch portion 13 by moving the lever 24 to the right.

[0052] With such a configuration of the locking mechanism 23, the lever 24 is moved (inserted) to the left and the second protruding shaft 24b is inserted into the tubular portion 13c of the arch portion 13, whereby the locking mechanism 23 is displaced to a restricted state in which the change in the position of the arch portion 13 is restricted. The lever 24 is moved (pulled) to the right and the second protruding shaft 24b is pulled out from the tubular portion 13c of the arch portion 13, whereby the locking mechanism 23 is displaced to a released state in which the change in the position of the arch portion 13 is permitted. As a result, the locking mechanism 23 is displaced to a restricted state, and fixes the arch portion 13, whose position has been changed to the use position, in the use position, and is displaced to a released state when the arch portion 13 is changed to the storage position. In addition, since the lever 24 is provided on the right side, i.e., the side of the driving unit 5, the operator of the driving unit 5 can easily operate the lever 24. From the above, the operator can easily put the locking mechanism 23 into the released state by pulling out the lever 24, and can easily change the position of the arch portion 13.

[0053] Furthermore, the support stay 18 may further be provided with a third hole portion 23c. When the position of the arch portion 13 is changed, the lever 24 needs to be maintained in a released state. Although the end portion of the second protruding shaft 24b may be abutted against the right side plate 18s so that the lever 24 is not in a restricted state, the lever 24 can be maintained in a released state more accurately by inserting the second protruding shaft 24b of the lever 24 into the third hole portion 23c in the released state.

[0054] Specifically, the third hole portion 23c is provided behind the first hole portion 23a in the right side plate 18s of the support stay 18, that is, on the opposite side of the first hole portion 23a to the second hole portion 23b. The lever 24 can swing along the axis P2 of the first protruding shaft 24a. When the second protruding shaft 24b is pulled out of the cylindrical portion 13c of the arch portion 13 and the lever 24 is in the released state, the lever 24 swings along the axis P2 and the second protruding shaft 24b is inserted into the third hole portion 23c. This maintains the lever 24 in the released state.

[0055] [Damper slide] Here, as shown in FIG. 7, when the arch portion 13 changes its posture from the use posture to the storage posture, the damper 20 is compressed at the beginning of the posture change, suppressing the momentum of the arch portion 13 when changing its posture. However, when the posture change of the arch portion 13 progresses and the damper 20 passes the dead point DP, the damper 20 generates a repulsive force in a direction that increases the momentum of the posture change. Therefore, when the damper 20 exceeds the dead point DP, it is not possible to suppress the momentum of the arch portion 13 when changing its posture from the use posture to the storage posture, and conversely, the damper 20 increases the momentum of the posture change. Here, the dead point DP corresponds to a straight line connecting the axis P1 about which the arch portion 13 swings and the axis of the damper support shaft 21p that is the swing center of the damper 20.

[0056] In order to suppress the action of the damper 20 from occurring in a direction that increases the momentum of the position change, one end of the damper 20 is supported by a damper support shaft 21p provided in the long hole 21h of the damper support part 21. When the arch part 13 changes its position from the use position to the storage position, the damper support shaft 21p of the damper 20 moves (slides) within the long hole 21h of the damper support part 21, suppressing the action of the damper 20 from occurring in a direction that increases the momentum of the position change. In other words, the long hole 21h and the damper support shaft 21p function as a shock absorbing mitigation means. The shock absorbing mitigation means starts to work at a predetermined time point during the position change of the arch part 13 from the use position to the storage position, and urges the arch part 13 in the opposite direction to the damper 20, which is the shock absorbing means. Note that the predetermined time point is preferably a time point before or after the damper 20 passes through the dead point DP.

[0057] Hereinafter, a configuration will be described with reference to FIG. 7 in which the damper support shaft 21p of the damper 20 moves (slides) within the long hole 21h to prevent the action of the damper 20 from occurring in a direction that increases the momentum of the attitude change.

[0058] First, as described above, when the arch portion 13 initially changes its position from the use position to the storage position, the damper 20 is compressed, and the damper 20 generates a repulsive force in a direction that suppresses the momentum of the position change of the arch portion 13. This repulsive force generates a rearward force component in the damper support shaft 21p of the damper 20, and the damper support shaft 21p is pressed against the rear end of the long hole 21h.

[0059] As the attitude change progresses and the damper 20 passes the perpendicular line PL passing through the damper support shaft 21p, the force generated in the horizontal direction of the damper support shaft 21p of the damper 20 changes to a forward direction due to the repulsive force of the damper 20. Then, the damper support shaft 21p moves (slides) forward within the long hole 21h. As a result, the damper 20 expands, the compression force is released, and the repulsive force is reduced. At this time, if the length of the long hole 21h in the forward direction is sufficiently long, the damper 20 expands completely and the repulsive force disappears.

[0060] In this way, when the arch portion 13 changes its position from the usage position to the storage position, the damper support shaft 21p of the damper 20 moves forward from the rear end of the long hole 21h before the damper 20 passes the perpendicular line PL and reaches the dead point DP, thereby reducing the repulsive force of the damper 20. Even if the damper 20 passes the dead point DP, the force generated in the direction that increases the momentum of the damper 20's position change is suppressed.

[0061] As a result, at the beginning of changing the position from the use position to the storage position, when it is difficult for the worker to support the arch portion 13, the damper 20 suppresses the momentum of the arch portion 13 changing its position, and thereafter, even if the damper 20 exceeds the dead point DP, the force that increases the momentum of the arch portion 13 changing its position, generated in the damper 20, can be suppressed. Therefore, the worker can manually change the position of the arch portion 13 easily and simply.

[0062] [Another embodiment] (1) In the above embodiment, an elastic body may be provided as a cushioning means together with or instead of the long hole 21h of the damper support portion 21. As shown in Fig. 8, for example, the elastic body is a coil spring 27. When the long hole 21h is not provided, the damper support shaft 21p is supported by the side plate 21s of the damper support portion 21 so as to be able to swing.

[0063] The coil spring 27 is wound around the first protruding shaft 24a of the lever 24 inside the support stay 18. One end of the coil spring 27 is supported along the rear portion of the bearing sleeve 13p of the arch portion 13, and is disposed near the upper portion of the arch portion 13 (connection portion 13t). The other end of the coil spring 27 is supported on the bottom plate 18b of the support stay 18. One end of the coil spring 27 comes into contact with the arch portion 13 while the arch portion 13 is changing its position from the use position to the storage position. In other words, the coil spring 27 starts to work at a predetermined point during the position change of the arch portion 13 from the use position to the storage position, and urges the arch portion 13 in the opposite direction to the damper 20, which is a buffer means.

[0064] By providing the coil spring 27 having such a configuration, when the arch portion 13 changes its position from the use position to the storage position, the coil spring 27 can suppress the momentum of the arch portion 13 changing its position by the repulsive force of the coil spring 27.

[0065] At the beginning of the change in posture from the use posture to the storage posture, one end of the coil spring 27 is separated from the arch portion 13. In the initial stage of the posture change, the momentum of the posture change of the arch portion 13 is suppressed by the damper 20. After that, when the posture of the arch portion 13 changes to around the dead point DP, one end of the coil spring 27 comes into contact with the arch portion 13. When the arch portion 13 exceeds the dead point DP, the damper 20 cannot suppress the momentum of the posture change of the arch portion 13, but after the coil spring 27 comes into contact with the arch portion 13, the momentum of the posture change of the arch portion 13 can be suppressed by the coil spring 27. Note that the coil spring 27 may be in contact with the arch portion 13 from the beginning, in which case the coil spring 27 suppresses the momentum of the posture change of the arch portion 13 during the posture change from the use posture to the storage posture.

[0066] Furthermore, even if the long hole 21h is not provided and the momentum of the damper 20 changing its position increases after passing the dead point DP, the force that increases the momentum of the damper 20 changing its position can be suppressed by the repulsive force of the coil spring 27.

[0067] From the above, the worker can manually change the position of the arch portion 13 easily and simply.

[0068] The coil spring 27 may be arranged in any configuration as long as it can suppress the momentum of the arch portion 13 changing its position from the use position to the storage position. For example, the coil spring 27 may be provided on the side plate 18s of the support stay 18 on the side where the lever 24 is provided, or on the other side plate 18s.

[0069] (2) In each of the above embodiments, the damper 20 is not limited to being provided on the left support stay 18, but may be provided on the right support stay 18, or may be provided on both the left and right support stays 18. Similarly, the coil spring 27 is not limited to being provided on the left support stay 18, but may be provided on the right support stay 18, or may be provided on both the left and right support stays 18. By providing the damper 20 and the coil spring 27 on both the left and right support stays 18, it is possible to suppress changes in the posture of the arch portion 13 in a balanced manner.

[0070] Furthermore, the configuration of the damper support portion 21 is not limited to the above configuration, and may be any configuration that can support one end of the damper 20 so as to be swingable in response to changes in the posture of the arch portion 13.

[0071] Furthermore, the buffer means is not limited to the damper 20, and may be of any configuration as long as it can suppress the momentum of the arch portion 13 changing its position while the arch portion 13 changes from the use position to the storage position. For example, the buffer means may be configured to suppress the momentum of the arch portion 13 changing its position by motor control or the like, or to suppress the change in position of the arch portion 13 by attaching a friction material or the like to the arch portion 13.

[0072] Furthermore, the change in the posture of the arch portion 13 is not limited to being performed manually, but may be performed automatically by an actuator. In this case, the buffer means can reduce the load on the actuator caused by the change in posture of the arch portion 13.

[0073] (3) In each of the above embodiments, the lock mechanism 23 is not limited to being provided on the left support stay 18, but may be provided on the right support stay 18, or may be provided on both the left and right support stays 18.

[0074] Furthermore, the lock mechanism 23 may have any configuration as long as it can be displaced between a restricting state that restricts the change in posture of the arch portion 13 and a released state that allows the change in posture.

[0075] (4) In each of the above embodiments, an elastic member 28 may be further provided on the support stay 18. As shown in Fig. 4, any number of elastic members 28 are provided on a horizontal plate 18v provided on the support stay 18. The horizontal plate 18v is provided on the front side of the support stay 18 in the central region in the up-down direction, spanning across the two side plates 18s.

[0076] When the arch portion 13 is changed from the stored position to the usage position, the arch portion 13 is received by the elastic member 28 and positioned in the usage position. At this time, the impact caused by the arch portion 13 coming into contact with the support stay 18 is absorbed by the elastic member 28.

[0077] As a result, even if the arch portion 13 is suddenly changed from the stored position to the usage position, the elastic member 28 absorbs the impact, suppressing the impact from being transmitted to the support stay 18 and the machine body 1, and the arch portion 13 is accurately held in the usage position. As a result, the worker can manually change the position of the arch portion 13 easily and simply.

[0078] (5) The arch portion 13 is not limited to being supported (connected) to the spare seedling support frame 11, and may be supported (connected) to the machine body 1 in any configuration. For example, the arch portion 13 may be supported (connected) across two support frames that are aligned in the left-right direction of the machine body 1 and extend upward from the machine body 1. [Industrial Applicability]

[0079] The present invention can be applied to field work machines such as rice transplanters in which the posture of an arch portion can be changed. [Explanation of symbols]

[0080] 1 Aircraft 4 Spare seedling storage device 7 Seedling planting device (work device) 11 Spare seedling support frame (support frame) 13 Arch section 13a First arch 13b Second arch section 13m Arch body 18 Support stay 20 Damper (buffer means) 21 Damper support 21h long hole (buffer relaxation means) 21p Damper support shaft (buffer cushioning means) 23 Locking mechanism 23a First hole 23b Second hole 23s Spring (biasing member) 24 Lever 24a First protruding shaft 24b Second protruding shaft 24m Lever body 27 Coil spring (elastic body, cushioning means) 28 Elastic Members

Claims

1. The aircraft and A work device that supplies materials to a field; A support frame extending upward from the fuselage; an arch portion connected to the support frame and capable of changing its position between a use position in which the arch portion protrudes upward from the support frame and a storage position which is lower than the use position; and a buffer means for suppressing the momentum of the arch portion when it changes position from the use position to the storage position.

2. The arch portion swings along an axis extending in the left-right direction of the aircraft to change its posture, 2. The farm machine according to claim 1, wherein the shock absorbing means is a damper provided across the support frame and the arch portion.

3. The field working machine according to claim 2 , further comprising a locking mechanism capable of restricting changes in the position of the arch portion.

4. The lock mechanism includes a support stay fixed to the support frame and supporting the arch portion, a lever, and a biasing member. The lever has a lever body and a first protruding shaft and a second protruding shaft protruding from both ends of the lever body, The support stay has a first hole portion and a second hole portion, the lever is capable of swinging along the first protruding shaft and moving parallel to the axial direction of the first protruding shaft in a state in which the first protruding shaft is inserted into the first hole portion, The lever is displaced, by the translation, between a restricting state in which the second protruding shaft is inserted into the second hole portion and penetrates the arch portion to restrict a change in posture of the arch portion, and a releasing state in which the second protruding shaft is extracted from the arch portion to allow a change in posture of the arch portion, The field work machine according to claim 3 , wherein the biasing member biases the lever in a direction in which the lever is displaced from the released state to the restricted state.

5. The field work machine according to claim 2 , further comprising an elastic member provided between the arch portion in the stored position and the support frame.

6. The support frames are provided in pairs, The arch portion is provided across the pair of support frames and has an arch main body portion, a first arch portion protruding from the arch main body portion and supported by one of the support frames, and a second arch portion protruding from the arch main body portion and supported by the other support frame, The field working machine according to claim 2 , wherein the damper is provided across one of the support frames and the first arch portion.

7. The support frames are provided in pairs, The arch portion is provided across the pair of support frames and has an arch main body portion, a first arch portion protruding from the arch main body portion and supported by one of the support frames, and a second arch portion protruding from the arch main body portion and supported by the other support frame, The field working machine according to claim 3 , wherein the locking mechanism is provided on the first arch portion.

8. A damper support portion fixed to the support frame; A long hole provided in the damper support portion; a damper support shaft passing through the elongated hole and movable along the elongated hole, 8. The farm work machine according to claim 2, wherein one end of the damper is supported by the damper support shaft.

9. 8. The field work machine according to claim 2, further comprising a cushioning mitigation means which begins to act at a predetermined point during the change in position of the arch portion from the use position to the storage position, and urges the arch portion in the opposite direction to the cushioning means.

10. 10. The farm implement according to claim 9, wherein the shock absorbing means is an elastic body.

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