Farm field work machine

Abstract

To perform posture change of a canopy easily.SOLUTION: A farm field work machine includes: a first support frame 11 and 32 erected on a machine body 1; a first swing supporting part 18 and 34 supported by the first support frame 11 and 32; a second support frame 13 and 33 supported by the first swing supporting part 18 and 34, which is supported swingably with respect to the first support frame 11 and 32; a second swing supporting part 38 and 39 supported by the second support frame 13 and 33; and a canopy 10 supported by the second swing supporting part 38 and 39, which is supported swingably with respect to the second support frame 13 and 33. The posture of the canopy 10 is changed to a use posture in which the canopy 10 covers an operation seat 5A and to a storage posture in which the height of the canopy 10 is lower than the height in the use posture while the second support frame 13 and 33, and the first support frame 11 and 32 are kept connected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a field working machine having a canopy that is changeable between a use position and a storage position. [Background technology]

[0002] Some rice transplanters equipped with a canopy can change the position of the canopy between a use position and a storage position in order to suppress the height of the rice transplanter when storing or transporting it. For example, the canopy of a rice transplanter (field work machine) disclosed in Patent Document 1 is tilted upward at the rear by swinging (folding) a connection part (first front frame) to which the front end of the canopy is connected downward. Furthermore, the height of the second support part (first rear frame) is lowered, and the second support part is separated from the locked member and attached to a fitting member provided in front of the non-locking member. This changes the position of the canopy from the working position (use position) to the storage position (storage position). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-110105 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the canopy position is changed manually, and the canopy is heavy, so it is difficult to shorten the second support part and change the attachment position of the second support part to the canopy. Therefore, the canopy position change has to be performed by two or more workers.

[0005] An object of the present invention is to easily change the position of a canopy. [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 machine body, a working device for performing work, a driver's seat provided on the machine body, a first support frame erected on the machine body, a first swinging support part supported by the first support frame, a second support frame supported by the first swinging support part and supported swingably relative to the first support frame, a second swinging support part supported by the second support frame, and a canopy supported by the second swinging support part and supported swingably relative to the second support frame, wherein the canopy changes position between a use position in which the canopy covers the driver's seat and a stored position in which the height of the canopy is lower than the use position while the second support frame and the first support frame remain connected.

[0007] With this configuration, the worker changing the position of the canopy no longer needs to hold the detached canopy, and the position of the canopy can be easily changed with fewer people than before.

[0008] In addition, when the canopy changes its position, the second support frame may swing in a first direction relative to the first support frame, and the canopy may swing in a second direction opposite to the first direction relative to the second support frame.

[0009] With this configuration, the canopy, which is horizontal to the field or slightly downward in the forward direction in the use position, can move approximately parallel to the field in the storage position to lower its height. Also, the canopy remains supported by the support frames (first support frame and second support frame) and swings in opposite directions at two points relative to the support frames, allowing the canopy to change its height and position while moving parallel to the field. This reduces the need for an operator to support the weight of the canopy or change its support position, making it easier for a smaller number of people (for example, one person) to change the position of the canopy than before.

[0010] Furthermore, a field work machine according to one embodiment of the present invention comprises a machine body, a working device for performing work, a driver's seat provided on the machine body, a pair of first front frames provided in front of the driver's seat and side by side in the left-right direction of the machine body, a pair of first rear frames provided behind the driver's seat and side by side in the left-right direction of the machine body, a first swinging support part supported by each of the first front frames and each of the first rear frames, a second support frame supported by each of the first swinging support parts and supported swingably with respect to the first front frame or the first rear frame, a second swinging support part supported by each of the second support frames, and a canopy supported by each of the second swinging support parts and supported swingably with respect to the second support frame, and while the second support frame and the first front frame are connected and the second support frame and the first rear frame remain connected, the canopy changes its position between a use position in which the canopy covers the driver's seat and a stored position in which the height of the canopy is lower than the use position.

[0011] With this configuration, the worker changing the position of the canopy does not need to hold the detached canopy, and the position of the canopy can be easily changed with a small number of people.

[0012] In addition, when the canopy changes its position, the second support frame may swing in a first direction relative to the first front frame or the first rear frame, and the canopy may swing in a second direction opposite to the first direction relative to the second support frame.

[0013] With this configuration, the canopy, which is supported by four support frames (a first front frame, a first rear frame, and two second support frames) horizontally to the field or slightly downward toward the front with respect to the forward movement direction in the use position, can move approximately in parallel in the stored position to lower its height. Also, by swinging in opposite directions at two points relative to the support frames while remaining supported by the support frames, the canopy can change its height and position while moving in parallel. This reduces the need for an operator to support the weight of the canopy or change its support position, so that the position of the canopy can be easily changed with fewer people (for example, one person) than before.

[0014] The vehicle may further include a locking mechanism capable of restricting changes in the position of the canopy.

[0015] With this configuration, the locking mechanism restricts the canopy from changing its position, and the canopy can only change its position when the locking mechanism is released. This prevents the canopy from changing its position unexpectedly, allowing the worker to change the canopy's position appropriately.

[0016] In addition, the locking mechanism is provided on the first swing support portion, and the locking mechanism can fix the canopy whose position has been changed to the storage position, and by changing the fixing position of the canopy, the height of the canopy in the storage position can be switched between multiple stages.

[0017] By being able to adjust the height of the canopy in the stored position in multiple stages, the height of the canopy can be optimized depending on the use in the stored position, such as during transportation or when storing in a barn, etc.

[0018] In addition, on each of the left and right sides of the aircraft, the front and rear first swing support parts, the front and rear second support frames, the front and rear second swing support parts, and the canopy may be configured in a linked manner.

[0019] With this configuration, the canopy can be easily changed in position by translating it in parallel, thereby efficiently lowering the height of the canopy in the stowed position and easily changing the position of the canopy.

[0020] The canopy may further include a cushioning mechanism supported across at least one of the first swing support parts and the second support frame supported by the first swing support part, for suppressing momentum when the canopy changes position from the use position to the storage position.

[0021] With this configuration, the shock absorbing mechanism can suppress the speed at which the canopy changes position when changing from the use position to the storage position. This suppresses the momentum of the canopy when changing position, and reduces the effort required of the worker to support the canopy. As a result, the worker can easily and simply manually change the position of the canopy.

[0022] The shock absorber may further include a shock absorber mechanism support part fixed to the first oscillating support part on which the shock absorber mechanism is supported, a long hole provided in the shock absorber mechanism support part, and a shock absorber mechanism support shaft passing through the long hole so as to be movable along the long hole, and one end of the shock absorber mechanism may be supported by the shock absorber mechanism support shaft.

[0023] When the canopy is changing its position from the use position to the dead point, the shock absorber is compressed and suppresses the momentum of the canopy changing its position. However, when the canopy is changing its position beyond the dead point to the storage position, the repulsive force of the shock absorber increases the momentum of the canopy changing its position.

[0024] According to the above configuration, when the canopy is changed 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 shock absorbing mechanism, and the compressed shock absorbing mechanism expands. This causes the repulsive force of the shock absorbing mechanism to disappear or decrease, and the increase in momentum when the canopy is changed in position is suppressed. As a result, the operator can manually change the position of the canopy easily and simply.

[0025] Furthermore, the elongated holes can absorb any assembly error in the fore-aft direction of the canopy, making it easy to assemble the canopy.

[0026] Further, each of the first rear frames may have a lower region that is bifurcated and supported by the airframe at two points.

[0027] In this way, by bifurcating the first rear frame and supporting it on the airframe, the rigidity of the support frame can be increased and the canopy can be supported on the airframe with high precision.

[0028] The canopy may also include a handle protruding in the direction of the driver's seat.

[0029] With this configuration, the worker can change the position of the canopy while holding the handle, so that the worker can easily change the position of the canopy. [Brief description of the drawings]

[0030] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a plan view illustrating an example of the configuration of a frame of a canopy. [Figure 4] 10A to 10C are side views illustrating examples of the configuration of a damper provided on an arch portion and the configuration of the arch portion when its posture is changed. [Diagram 5] 13 is a right side view illustrating a main configuration of the support stay that supports the arch portion that changes its posture. FIG. [Figure 6] FIG. 4 is a front view illustrating a main configuration of the support stay. [Figure 7] FIG. 4 is a plan view illustrating a configuration of a main part of the support stay. [Figure 8] 11A and 11B are diagrams illustrating the action of a damper before and after a dead point. [Figure 9]13 is a side view illustrating the configuration of a lower swing support part. FIG. [Figure 10] 13 is a rear view illustrating the configuration of the lower swing support part. FIG. [Figure 11] 11 is a perspective view illustrating a configuration of a front swing support part. FIG. [Figure 12] 13 is a rear view illustrating the configuration of the rear swing support part. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, as an example of a field working machine, a rice transplanter for planting seedlings (corresponding to materials) in a field will be described with reference to the drawings.

[0032] 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.

[0033] [Overall structure] As shown in Figures 1 and 2, the rice transplanter is a riding type with a four-wheel drive body 1. The body 1 is equipped with wheels 2, a working device, a spare seedling storage device 4, a driving unit 5, a rotating marker 6, and a canopy 10.

[0034] 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 is an example of a material, in the 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 is 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 in the driver's section 5. A driver's seat 5A is provided in the driver's section 5, in which the operator (driver) is seated.

[0035] The spare seedling storage device 4 stores spare seedlings. The spare seedling storage device 4 is supported by a spare seedling support frame 11 (corresponding to the first support frame and the first front frame) 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 erected on the machine body 1 in line in the left-right direction of the machine body 1 in front of the driver's seat 5A. The left and right spare seedling support frames 11 each support a plurality of spare seedling storage devices 4.

[0036] [Canopy] As shown in FIGS. 1 to 3, the canopy 10 is supported on the aircraft body 1 via a support frame so as to cover the upper part of a driver's seat 5A provided in the driver's station 5.

[0037] An arch portion 13 (corresponding to a second support frame) is connected to the horizontal portion 11t of the spare seedling support frame 11 via a support stay 18 (corresponding to a first swinging support portion). 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 rice transplanter has a pair of rear frames 31 that are supported by the machine body 1 in a line in the left-right direction of the machine body 1 behind the driver's seat 5A. The rear frames 31 have a first rear frame 32 (corresponding to a first support frame) that is erected on the machine body 1, and a second rear frame 33 (corresponding to a second support frame) that is connected to the upper portion of the first rear frame 32 via a lower swinging support portion 34 (corresponding to a first swinging support portion). The support frame has the spare seedling support frame 11, the arch portion 13, the first rear frame 32, and the second rear frame 33.

[0038] The canopy 10 is configured such that a frame 35 is covered by a hood portion 36. The hood portion 36 is configured by appropriately combining resin, metal, cloth, etc. The frame 35 is provided in a ring shape along the outer periphery of the canopy 10 with a front frame 35A, a rear frame 35B, a right frame 35C, and a left frame 35D, and has a reinforcing frame 35E that is appropriately provided.

[0039] The canopy 10 is provided with a handle 37 that protrudes toward the inside of the driver's section 5. The handle 37 is provided on the underside of the canopy 10 and protrudes downward, that is, toward the driver's seat 5A of the driver's section 5. The handle 37 is configured to be gripped by an operator such as a driver. The handle 37 is supported by the frame 35. Specifically, the reinforcing frame 35E extending in the front-rear direction near the center of the left and right sides of the frame 35 supports a stay 37A protruding rightward from the reinforcing frame 35E in a region slightly rearward in the front-rear direction. In addition, the reinforcing frame 35E extending in the left-right direction at the rear part of the frame 35 supports a stay 37B protruding in either the front or rear direction from the reinforcing frame 35E in a region to the right of the reinforcing frame 35E supporting the stay 37A. The front end region of the handle 37 is supported by the stay 37A, and the rear end region is supported by the stay 37B.

[0040] The front frame 35A is connected to the arch main body 13m of the arch portion 13 via two front swing support parts 38 (corresponding to the second swing support parts) lined up in the left-right direction. The right frame 35C is connected to the upper part of the right-side second rear frame 33 via the rear swing support part 39 (corresponding to the second swing support part). The left frame 35D is connected to the upper part of the left-side second rear frame 33 via the rear swing support part 39. In this way, the canopy 10 is supported by the support frame. The rear swing support part 39 is configured to absorb an assembly error between the second rear frame 33 and the right frame 35C or the left frame 35D, as described later.

[0041] Since an operator (driver) gets on and off the driver's seat 5, the canopy 10 needs to be provided at a certain height relative to the driver's seat 5A. On the other hand, when storing the rice transplanter in a warehouse or transporting it on a truck, it is convenient to lower the height of the rice transplanter.

[0042] Therefore, the canopy 10 is provided in such a configuration that it can be changed between a use position in which it covers the driver's seat 5A (driver's section 5) at a height that allows the operator (driver) to get in and out, and a storage position in which it is lower than the use position. The operator (driver) changes the position of the canopy 10 while holding the handle 37. This allows the operator (driver) to hold the canopy 10 using the handle 37 and change the position.

[0043] Here, the support stay 18 supports the arch portion 13 to be swingable along an axis P1 extending in the left-right direction of the machine body 1. Therefore, the arch portion 13 can swing in the front-rear direction and up-down direction relative to the spare seedling support frame 11. The lower swing support portion 34 supports the second rear frame 33 to be swingable along an axis P3 extending in the left-right direction of the machine body 1. Therefore, the second rear frame 33 can swing in the front-rear direction and up-down direction relative to the first rear frame 32.

[0044] In addition, the front swing support part 38 supports the front frame 35A to be swingable along an axis P4 extending in the left-right direction of the machine body 1. Therefore, the front frame 35A can swing in the front-rear direction and up-down direction relative to the spare seedling support frame 11. The rear swing support part 39 supports the right frame 35C or the left frame 35D to be swingable along an axis P5 extending in the left-right direction of the machine body 1. Therefore, the right frame 35C and the left frame 35D can swing in the front-rear direction and up-down direction relative to the second rear frame 33.

[0045] Therefore, the canopy 10 can be changed in position between the use position and the storage position while the spare seedling support frame 11 (first support frame) and the arch portion 13 (second support frame) are connected and the first rear frame 32 (first support frame) and the second rear frame 33 (second support frame) are connected.

[0046] This eliminates the need for the worker changing the position of the canopy 10 to hold the detached canopy 10, and allows a small number of people to easily change the position of the canopy 10.

[0047] Also, with the above-mentioned configuration, a parallel link is formed (in a link shape) on each of the left and right sides of the fuselage 1 by the support stays 18, the arch portion 13, the front swing support portion 38, the canopy 10, the rear swing support portion 39, the second rear frame 33, and the lower swing support portion 34. The attitude of the canopy 10 is changed by using this parallel link so that the canopy 10 moves in parallel.

[0048] For example, when the canopy 10 in the use position changes to the storage position (phantom line in FIG. 1), the arch portion 13 swings rearward and downward (first direction) along the axis P1 of the support stay 18 (falls backward), and the second rear frame 33 swings rearward and downward (first direction) along the axis P3 of the lower swing support portion 34 (falls backward). At the same time, the canopy 10 swings frontward and downward (second direction opposite to the first direction) along the axis P4 of the front swing support portion 38 and the axis P5 of the rear swing support portion 39. Through the above-mentioned operation, the canopy 10 moves approximately parallel to the rear and downward directions to change from the use position to the storage position.

[0049] This allows the worker to change the position of the separated canopy 10 by swinging it without holding it, so that the position of the canopy 10 can be easily changed with a small number of people.

[0050] [Arch section] As shown in Figs. 1 to 3, the end regions of the first arch portion 13a and the second arch portion 13b on the opposite side to the arch body portion 13m are the connection portions 13t extending in a direction different from 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 connection portion 13t is supported by the horizontal portion 11t. The axis P1 is provided in the front region of the connection portion 13t, and the arch portion 13 in the storage position can be changed to a position downward with respect to the connection portion 13t.

[0051] 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.

[0052] The arch portion 13 changes its position in accordance with the change in the position of the canopy 10. In Fig. 4, 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, the canopy 10, etc. are omitted.

[0053] [Support stay] As shown in Figures 4 to 7, 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 is swingable along the axis P1.

[0054] For example, the support stay 18 extends in the front-rear direction of the fuselage 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. As the bearing sleeve 13p slides along the swing shaft 18p, the arch portion 13 swings along the axis P1 of the swing shaft 18p, changing the posture of the canopy 10.

[0055] [Damper] The position of the canopy 10 is changed manually by an operator. When the canopy 10 is changed from the use position to the storage position, the operator swings the canopy 10 in a direction to lower the canopy 10 while supporting the canopy 10. At this time, if the canopy 10 (arch portion 13) swings forcefully, the burden on the operator becomes heavy.

[0056] Therefore, as shown in Figs. 4 to 7, a damper 20, which is a shock absorbing mechanism, 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 canopy 10 (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. This repulsive force allows the damper 20 to suppress the momentum of the position change when the canopy 10 (arch portion 13) changes its position from the use position to the storage position, and to assist the worker in supporting the canopy 10. As a result, the force required for the worker to support the canopy 10 when changing the position of the canopy 10 (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 canopy 10.

[0057] 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.

[0058] Specifically, the support stay 18 supported (fixed) to the left spare seedling support frame 11 has a damper support part 21 (corresponding to a buffer mechanism support part) 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 (corresponding to a buffer mechanism support shaft) 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 panel 21s extends downward and is supported by the support stay 18, thereby being supported by the spare seedling support frame 11.

[0059] [Damper slide] Here, as shown in FIG. 8, when the canopy 10 changes its position from the use position to the storage position, the damper 20 is compressed at the beginning of the position change, and the arch portion 13 changes its position to suppress the momentum of the canopy 10 changing its position. However, when the canopy 10 (arch portion 13) changes its position 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 position change. Therefore, when the damper 20 exceeds the dead point DP, it is not possible to suppress the momentum of the canopy 10 changing its position from the use position to the storage position, and instead the damper 20 increases the momentum of the position 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.

[0060] In order to prevent the action of the damper 20 from occurring in a direction that increases the momentum of the attitude 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 portion 21. When the canopy 10 changes its attitude from the use attitude to the storage attitude, the damper support shaft 21p of the damper 20 moves (slides) within the long hole 21h of the damper support portion 21, thereby preventing the action of the damper 20 from occurring in a direction that increases the momentum of the attitude change.

[0061] Hereinafter, a configuration will be described with reference to FIG. 8 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.

[0062] First, as described above, when the arch portion 13 initially changes position as the canopy 10 changes 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 canopy 10. 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.

[0063] 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.

[0064] In this way, when the canopy 10 changes its position from the use position to the storage position, before the damper 20 passes the perpendicular line PL and reaches the dead point DP, the damper support shaft 21p of the damper 20 moves forward from the rear end of the long hole 21h, 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.

[0065] As a result, at the beginning of changing the position of the canopy 10 from the use position to the storage position, when it is difficult for an operator to support the canopy 10, the damper 20 suppresses the momentum of the canopy 10 changing its position, and thereafter, even if the damper 20 exceeds the dead point DP, the force that increases the momentum of the canopy 10 changing its position, generated in the damper 20, can be suppressed. Therefore, an operator can manually change the position of the canopy 10 easily and simply.

[0066] [Lower swing support part] Next, the configuration of the lower swing support part 34 will be described with reference to Figures 9 and 10. The left and right first rear frames 32 are each provided with a lower swing support part 34. Figures 9 and 10 show the left lower swing support part 34, and in the following description, the left lower swing support part 34 will be described.

[0067] The lower swing support part 34 has two side parts 34B sandwiching a bottom part 34A. The front end of the bottom part 34A is set back from the front ends of the side parts 34B. The lower swing support part 34 is fixed to the first rear frame 32 with the first rear frame 32 sandwiched between the front end regions of the two side parts 34B and with the front end of the bottom part 34A in contact with the first rear frame 32.

[0068] The lower swing support part 34 sandwiches the second rear frame 33 between the two side parts 34B. The lower swing support part 34 includes a support shaft part 34C that penetrates the two side parts 34B and the second rear frame 33. As a result, the second rear frame 33 is supported by the lower swing support part 34 in a manner that allows it to swing along the support shaft part 34C that extends in the left-right direction of the machine body 1 relative to the lower swing support part 34.

[0069] The lower swing support part 34 has a restricting shaft part 34D provided across two side parts 34B in an upper front region. The lower swing support part 34 also has a restricting plate 34E provided across two side parts 34B below the support shaft part 34C in the rear region. The second rear frame 33 swings within the range of the restricting shaft part 34D and the restricting plate 34E. When the second rear frame 33 abuts against the restricting shaft part 34D, the canopy 10 is in the use position, and the second rear frame 33 is restricted from swinging further forward by the restricting shaft part 34D. When the second rear frame 33 abuts against the restricting plate 34E, the canopy 10 is in the storage position, and the second rear frame 33 is restricted from swinging further rearward by the restricting plate 34E.

[0070] By swinging the second rear frame 33 supported by the lower swing support portion 34 in this manner, the position of the canopy 10 can be easily changed.

[0071] [Front swing support part] Next, the configuration of the front swing support parts 38 will be described with reference to Figures 3 and 11. As described above, the front swing support parts 38 are provided in two positions on the left and right sides of the arch main body part 13m, and each of the front swing support parts 38 supports the canopy 10 on the arch part 13 by supporting the front frame 35A.

[0072] The front swing support portion 38 includes a fixed portion 38A and a swing portion 38B. The fixed portion 38A is fixed to the arch main body portion 13m. The swing portion 38B is fixed to the front frame 35A.

[0073] The fixed portion 38A has a pair of side portions 38a facing each other, and a shaft portion 38C. The swinging portion 38B has a front plate 38b and a pair of horizontal plates 38c extending rearward from both left and right ends of the front plate 38b.

[0074] The fixed portion 38A has two side portions 38a sandwiching the swinging portion 38B, and the shaft portion 38C penetrates the side portions 38a and the swinging portion 38B. As a result, the fixed portion 38A supports the swinging portion 38B in such a manner that the swinging portion 38B can swing along the shaft portion 38C. The swinging portion 38B supports the arch main body portion 13m at its rear end.

[0075] As the swinging portion 38B swings along the axis P4 of the shaft portion 38C, the front frame 35A swings relative to the arch portion 13 (arch main body portion 13m), and the canopy 10 can swing relative to the arch portion 13 easily.

[0076] [Rear swing support part] Next, the configuration of the rear swing support part 39 will be described with reference to Figures 1, 3, and 12. As described above, the rear swing support part 39 is provided on each of the left and right second rear frames 33. The left rear swing support part 39 supports the left frame 35D, and the right rear swing support part 39 supports the right frame 35C. As a result, the left and right second rear frames 33 support the canopy 10.

[0077] The rear swing support part 39 includes a fixed part 39A and a swing part 39B. The fixed part 39A is fixed to the upper end part of the second rear frame 33. The left swing part 39B is fixed to the left frame 35D. The right swing part 39B is fixed to the right frame 35C.

[0078] The fixed portion 39A has a bottom plate 39a, a pair of side portions 39b extending upward from both left and right ends of the bottom plate 39a, and a shaft portion 39C. The side portions 39b have an attachment hole 39f. The swinging portion 39B has a base plate 39c and a pair of horizontal plates 39d extending from both left and right ends of the base plate 39c. The horizontal plates 39d have a plurality of attachment holes 39e that can be received even when lined up in the fore-aft direction of the aircraft. The swinging portion 39B is fixed to the right frame 35C or the left frame 35D in a manner that the pair of horizontal plates 39d sandwich the right frame 35C or the left frame 35D.

[0079] The fixed portion 39A sandwiches the swinging portion 39B between the two side portions 39b, and the shaft portion 39C passes through the assembly holes 39f of the side portions 39b and one of the assembly holes 39e of the swinging portion 39B. Thus, the fixed portion 39A supports the swinging portion 39B in such a manner that the swinging portion 39B can swing along the shaft portion 39C. In addition, by selecting one of the multiple swinging portions 39B that has the smallest assembly error as the assembly hole 39e through which the shaft portion 39C passes, it is possible to absorb an assembly error between the second rear frame 33 and the right frame 35C or the left frame 35D.

[0080] As the swinging portion 39B swings along the axis P5 of the shaft portion 39C, the left frame 35D and the right frame 35C swing relative to the second rear frame 33, and the canopy 10 can easily swing relative to the second rear frame 33.

[0081] With the above-mentioned configuration, the arch portion 13 swings relative to the spare seedling support frame 11 along the axis P1 of the support stay 18, and the second rear frame 33 swings relative to the first rear frame 32 along the axis P3 of the lower swing support portion 34. Furthermore, the canopy 10 swings relative to the arch portion 13 along the axis P4 of the front swing support portion 38, and swings relative to the second rear frame 33 along the axis P5 of the rear swing support portion 39. With the above-mentioned operations, the canopy 10 can easily change its position by moving approximately parallel in the front-rear and up-down directions.

[0082] [Lock mechanism] As shown in Figs. 5 to 7, 9 and 10, the rice transplanter includes a locking mechanism 23 that restricts changes in the position of the canopy 10. The locking mechanism 23 can be provided in at least one of the first arch portion 13a and the second arch portion 13b of the arch portion 13 and the two second rear frames 33. In this embodiment, the locking mechanism 23 is provided in the first arch portion 13a and the two second rear frames 33. Below, the locking mechanism 23 provided in the first arch portion 13a will be described as an example.

[0083] The locking mechanism 23 provided on the arch portion 13 restricts the change in position of the arch portion 13, thereby restricting the change in position of the canopy 10. The locking mechanism 23 is configured to be in a restricting state in which the change in position of the arch portion 13 is restricted, and in a released state in which the change in position of the arch portion 13 is permitted. The locking mechanism 23 is provided on the left support stay 18.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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).

[0090] 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.

[0091] 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 restricting 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 release 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 restricting state, and fixes the arch portion 13 (canopy 10) that has been changed to the use position to the use position, and is displaced to a release state when the arch portion 13 (canopy 10) is changed to the storage position. In addition, since the lever 24 is provided on the right side, i.e., the side of the driver's unit 5, the operator of the driver's unit 5 can easily operate the lever 24. As described above, by pulling out the lever 24, the operator can easily set the lock mechanism 23 to the released state, and can easily change the position of the arch portion 13 (canopy 10).

[0092] 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.

[0093] 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.

[0094] At this time, with the arch portion 13 changed to the storage position, the second protruding shaft 24b can be inserted into the tubular portion 13c and the third hole portion 23c of the arch portion 13 in the storage position, thereby maintaining (fixing) the arch portion 13 (canopy 10) in the storage position.

[0095] Furthermore, the support stay 18 may be provided with a plurality of third holes 23c. In other words, when the second protruding shaft 24b is inserted into the tubular portion 13c of the arch portion 13 in the stored position and into the third hole 23c, the third hole 23c into which the second protruding shaft 24b is inserted can be selected. The third hole 23c is provided at a position where the height of the arch portion 13 (canopy 10) in the stored position changes depending on the third hole 23c into which the second protruding shaft 24b is inserted.

[0096] This allows the fixing position of the arch portion 13 (canopy 10) to be changed by selecting the third hole portion 23c into which the second protruding shaft 24b is inserted, and the height of the arch portion 13 (canopy 10) in the stored position can be switched between multiple levels. Therefore, the height of the arch portion 13 (canopy 10) can be optimized depending on the use in the stored position, such as during transportation or when storing in a barn or the like.

[0097] When the locking mechanism 23 restricts the swinging of the second rear frame 33, the locking mechanism 23 is provided on the lower swing support portion 34. In this case, the lever 24 is provided so as to be insertable / removable and swingable relative to the lower swing support portion 34, and the second hole portion 23b and the third hole portion 23c are provided on the side portion 34B. In addition, the locking mechanism 23 is preferably provided on the lower swing support portion 34 so that the lever body portion 24m of the lever 24 is disposed on the driver's seat 5A side.

[0098] [Another embodiment] (1) In the above embodiment, the front portion of the canopy 10 is not limited to being supported by a support frame consisting of the spare seedling support frame 11 and the arch portion 13, and may be supported by the machine body 1 via any support frame. For example, such a support frame has a pair of first front frames arranged side by side in the left-right direction of the machine body 1, a first swinging support part having a function similar to that of the support stay 18 supported by the first front frames, a second support frame supported by the first swinging support part, and a second swinging support part (front swinging support part 38) supported by the second support frame and supporting the canopy 10. The second support frame swings relative to the first front frame by the first swinging support part, and the canopy 10 swings relative to the second support frame by the second swinging support part.

[0099] This makes it possible to easily change the position of the canopy 10 even in a field work machine that does not have a spare seedling support frame 11 or an arch portion 13.

[0100] The support frames are not limited to a pair provided on the left and right sides, and one or three or more support frames may be provided.

[0101] (2) In each of the above embodiments, the support frame is not limited to a configuration in which the spare seedling support frame 11, the arch portion 13, the first rear frame 32, and the second rear frame 33 support the canopy 10 with a frame erected from four points on the body 1, but may be composed of one or more first support frames erected on the body 1 and a second support frame that can swing relative to the first support frames. In this case as well, the second support frame is supported by the first support frame via a first swinging support portion, and the canopy 10 is supported by the second support frame via a second swinging support portion.

[0102] This allows the canopy 10 to be supported by the fuselage 1 in a flexible configuration and yet easily change its attitude.

[0103] (3) In each of the above embodiments, the support frame is not limited to a configuration in which parallel links are formed to change the position of the canopy 10, and the support frame may be configured to change its position in any manner.

[0104] (4) In each of the above embodiments, when the canopy 10 in the usage position is changed to the storage position, the canopy 10 is not limited to swinging backward and downward. As long as the height of the canopy 10 in the storage position is lower than the height of the canopy 10 in the usage position, the canopy 10 may swing in any direction.

[0105] (5) In each of the above embodiments, the damper 20 is not limited to being provided in the arch portion 13, and may be provided in the second rear frame 33. In other words, the damper 20 may be provided in at least one of the first arch portion 13a, the second arch portion 13b, the right-side second rear frame 33, and the left-side second rear frame 33.

[0106] Also, instead of the damper 20, a buffer mechanism of any configuration capable of suppressing the momentum of the attitude change of the canopy 10 may be provided. For example, the buffer mechanism may be a coil spring provided across the swing shaft of the support frame and the support frame.

[0107] This allows the attitude of the canopy 10 to be changed with greater freedom and precision.

[0108] (6) In each of the above embodiments, the locking mechanism 23 is not limited to the above configuration, and may have any configuration as long as it can restrict the change in position of the canopy 10. Also, a configuration in which the locking mechanism 23 is not provided may be used.

[0109] (7) In each of the above embodiments, the support stay 18, the lower swing support part 34, the front swing support part 38, and the rear swing support part 39 may have any configuration as long as the posture of the canopy 10 can be changed. In other words, the support stay 18 and the lower swing support part 34 may have any configuration as long as they can swing the support frames such as the arch part 13 and the second rear frame 33. Similarly, the front swing support part 38 and the rear swing support part 39 may have any configuration as long as they can swing the canopy 10. Furthermore, when assembly precision can be ensured, the rear swing support part 39 may have a single assembly hole 39e instead of a plurality of assembly holes 39e.

[0110] (8) In each of the above embodiments, the first rear frame 32 may be configured such that the lower region is bifurcated and supported by the airframe 1 at two locations. For example, the first rear frame 32 includes a first lower frame 32A and a second lower frame 32B supported by the airframe 1, and an upper frame 32C connected to each of the first lower frame 32A and the second lower frame 32B. The first lower frame 32A is connected to a frame supporting the rear step (rear step support frame), and the second lower frame 32B is connected to the main frame of the airframe 1. With this configuration, the first rear frame 32 is supported by the airframe 1 at two different locations, so that the rigidity of the first rear frame 32 is increased and the resistance to vibration is also increased, and the canopy 10 can be supported by the airframe 1 with high precision by the first rear frame 32 and the second rear frame 33 (rear frame 31).

[0111] The upper frame 32C, the first lower frame 32A, and the second lower frame 32B are connected via an adjustment portion 32D. Instead of the assembly holes 39e of the rear swing support portion 39 described above, or in addition to the assembly holes 39e, the adjustment portion 32D may have a long hole (not shown) in order to absorb an overall assembly error when connecting the rear swing support portion 39 and the second rear frame 33. The upper frame 32C, the first lower frame 32A, and the second lower frame 32B are fixed at any position of the long hole, so that an assembly error between the upper frame 32C and the first lower frame 32A and the second lower frame 32B can be absorbed. In this case, the upper frame 32C, the first lower frame 32A and the second lower frame 32B may be configured to be connected by the adjustment portion 32D, or the upper frame 32C and the second lower frame 32B may be formed integrally, and assembly errors between the first lower frame 32A and the upper frame 32C and the second lower frame 32B may be adjusted by long holes in the adjustment portion 32D.

[0112] In addition, in order to avoid interference between the rotating marker 6, etc. and the first rear frame 32 when the seedling planting device 7 is raised when not in use, at least one of the upper frame 32C, the first lower frame 32A and the second lower frame 32B may be configured to be recessed forward.

[0113] (9) In each of the above embodiments, an elastic member 28 may be further provided on the support stay 18. As shown in Fig. 5 and Fig. 6, 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.

[0114] 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.

[0115] As a result, even if the canopy 10 is suddenly changed from the stored position to the use position, the elastic member 28 absorbs the impact, preventing the impact from being transmitted to the support stays 18 and the fuselage 1, and the canopy 10 is accurately held in the use position. As a result, the operator can manually change the position of the arch portion 13 easily and simply. [Industrial Applicability]

[0116] The present invention can be applied to a field work machine such as a rice transplanter in which the position of the canopy can be changed. [Explanation of symbols]

[0117] 1 Aircraft 5A Driver's seat 7 Seedling planting device (work device) 10 Canopy 11 Spare seedling support frame (first support frame, first front frame) 13 Arch section (second support frame) 18 Support stay (first swing support part) 20 Damper (buffer mechanism) 21 Damper support 21h long hole 21p Damper support shaft 23 Locking mechanism 32 First rear frame (first support frame) 33 Second rear frame (second support frame) 38 Front swing support part (second swing support part) 39 Rear swing support part (second swing support part)

Claims

1. The aircraft and A work device for performing work; A driver's seat provided in the aircraft; A first support frame provided upright on the airframe; A first swing support part supported by the first support frame; a second support frame supported by the first swing support portion and swingably supported with respect to the first support frame; A second swing support part supported by the second support frame; a canopy supported by the second swing support portion and swingably supported with respect to the second support frame, The field work machine has a canopy that changes position between a use position in which the canopy covers the driver's seat and a storage position in which the height of the canopy is lower than that of the use position, while the second support frame and the first support frame remain connected.

2. The field work machine according to claim 1, wherein when the canopy changes position, the second support frame swings in a first direction relative to the first support frame, and the canopy swings in a second direction opposite to the first direction relative to the second support frame.

3. The aircraft and A work device for performing work; A driver's seat provided in the aircraft; A pair of first front frames arranged side by side in the left-right direction of the aircraft body in front of the driver's seat; A pair of first rear frames arranged side by side in the left-right direction of the aircraft behind the driver's seat; a first swing support portion supported by each of the first front frames and each of the first rear frames; a second support frame supported by each of the first swing support portions and swingably supported with respect to the first front frame or the first rear frame; A second swing support portion supported by each of the second support frames; a canopy supported by each of the second swing support portions and swingably supported relative to the second support frame, The second support frame and the first front frame are connected to each other, and the second support frame and the first rear frame remain connected to each other, and the canopy changes position between a use position in which the canopy covers the driver's seat and a stored position in which the height of the canopy is lower than that of the use position.

4. A field work machine as described in claim 3, wherein when the canopy changes position, the second support frame swings in a first direction relative to the first front frame or the first rear frame, and the canopy swings in a second direction opposite to the first direction relative to the second support frame.

5. The field work machine according to any one of claims 1 to 4, further comprising a locking mechanism capable of restricting changes in the position of the canopy.

6. The lock mechanism is provided on the first swing support portion, The field work machine according to claim 5, wherein the locking mechanism can fix the canopy when it has been changed to the storage position, and by changing the fixing position of the canopy, the height of the canopy in the storage position can be switched between multiple levels.

7. 5. The field work machine according to claim 1, wherein the front and rear first swing support parts, the front and rear second support frames, the front and rear second swing support parts, and the canopy are configured in a linked shape on each of the left and right sides of the body.

8. 5. The field work machine according to claim 1, further comprising a cushioning mechanism supported across at least one of the first swing support parts and the second support frame supported by the first swing support part, for suppressing momentum when the canopy changes position from the use position to the stored position.

9. a buffer mechanism support portion fixed to the first swing support portion on which the buffer mechanism is supported; a long hole provided in the buffer mechanism support portion; a buffer mechanism support shaft passing through the long hole and movable along the long hole; 9. The farm implement according to claim 8, wherein one end of the shock absorbing mechanism is supported by the shock absorbing mechanism support shaft.

10. The field work machine according to claim 3 or 4, wherein each of the first rear frames has a lower region that is bifurcated into two and is supported by the body at two points.

11. The field work machine according to any one of claims 1 to 4, wherein the canopy is provided with a handle that protrudes in the direction of the driver's seat.

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