JP2018102225A - Mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mower which can prevent scattering of foreign substances from an operation part regardless of an operation state.SOLUTION: A mower includes: an operation part which operates a mowing operation upon receiving motive power from a body; an offset mechanism part which can be moved to an offset position in which the operation part is offset to a side of a travel direction of the body; a motive power transmission part which transmits the motive power to the operation part; a rotational mechanism part which rotates the operation part about an axis along the travel direction of the body; and a cover mechanism part having a cover member in which a relative positional relationship with the operation part changes according to the rotational position of the operation part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mower. In particular, the present invention relates to an offset type mowing machine that is attached to the rear part of a traveling machine body and performs mowing work on the side of the traveling machine body.

  2. Description of the Related Art Conventionally, a mower is known as an agricultural machine that performs mowing work to remove weeds on farm roads and wasteland. Generally, a mowing machine advances a mowing work by towing a working part with a traveling machine such as a tractor. 2. Description of the Related Art In recent years, a working unit that performs mowing work is movable to the side of a traveling machine body, and an offset type mowing machine that performs mowing work on the side of the traveling machine body is known (Patent Document 1).

JP 2012-191864 A

  Usually, in a mowing machine, a cutting blade for performing a mowing operation rotates in an upcut direction (a direction in which the grass is cut upward from below). For this reason, during work, pebbles or the like may fly from the working unit for mowing to the traveling machine body. Therefore, for example, in the case of the offset type mower described in Patent Document 1, there may occur a problem that a pebble flying in front of the working unit hits a side mirror such as a tractor and the side mirror is damaged.

  In order to cope with such a problem, a cover member for preventing scattering of soil and pebbles is usually suspended in a swingable manner in front of the working part of the mower. For example, in the mower described in Patent Document 1, a swingable front plate 125 is provided at each of the front end portion and the rear end portion of the mowing operation unit 103 as shown in FIG. As a result, the pebbles and the like bounced off by the rotation of the cutting blade 124 fall on the front plate 125 that is a cover member in front of the working unit, and thus the pebbles and the like can be prevented from being scattered on the traveling machine body.

  However, when working on an inclined surface located below the traveling machine body using an offset type mower, the cover member may not function effectively. For example, in FIG. 7 of Patent Document 1, the tractor 501 is mowing the inclined surface GC that is inclined downward while traveling on the ground contact surface GL. In this case, a substantially triangular space (gap) is formed between the ground contact surface GL and the mowing operation unit 103 at a portion closer to the tractor 501 than the edge GB of the ground contact surface GL.

  If such a space arises, the distance between the ground contact surface GL and the front plate 125 will be too far away, so depending on the angle at which the pebbles and the like bounced by the rotating cutting blade 124 scatter, The inner wall of the plate 125 may not hit. That is, the pebbles repelled by the rotation of the cutting blade 124 located on the ground contact surface GL may pass through the front plate 125 and hit the front tractor 501, possibly resulting in problems such as damage to the side mirror of the tractor 501. is there.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a mower capable of preventing the scattering of foreign matter from a working unit regardless of the working posture.

  A mowing machine according to an embodiment of the present invention includes a working unit that receives power from a traveling machine body and performs a mowing operation, and an offset capable of moving the working part to a position that is laterally offset with respect to a traveling direction of the traveling machine body. A mechanism unit, a power transmission unit that transmits the power to the working unit, a rotation mechanism unit that rotates the working unit about the axis when the traveling direction of the traveling machine body is an axis, and the work A cover mechanism portion having a cover member whose relative positional relationship with the working portion changes according to the rotation position of the portion.

  The mower according to the embodiment of the present invention described above can prevent the scattering of foreign matter from the working unit regardless of the working posture.

It is a top view which shows the structure of the mower in 1st Embodiment. It is a side view which shows the structure of the mower in 1st Embodiment. It is a rear view which shows the structure of the mower in 1st Embodiment. It is a top view which shows the structure of the power transmission part of the mower in 1st Embodiment. It is a top view which shows the working state at the time of the normal time of the mower in 1st Embodiment. It is a rear view which shows the working state at the normal time of the mower in 1st Embodiment. It is a rear view which shows the state which exists in the position which the working part of the mower in 1st Embodiment rotated below. It is a rear view which shows the state which exists in the position which the working part of the mower in 1st Embodiment rotated upwards. It is a front view which shows the working state at the time of the normal of the mower in 1st Embodiment. It is a front view which shows the state which exists in the position which the working part of the mower in 1st Embodiment rotated below. It is a front view which shows the state which exists in the position which the working part of the mower in 1st Embodiment rotated upwards.

  Hereinafter, embodiments of the mower of the present invention will be described with reference to the drawings. However, the mower of the present invention can be implemented in many different modes, and is not construed as being limited to the description of the examples shown below. Note that in the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals, and repetitive description thereof is omitted.

  For convenience of explanation, words indicating directions such as upward, downward, forward, backward, rightward, and leftward are used, but the direction in which gravity works is downward, and vice versa. The traveling direction of the traveling machine body is the front, and the reverse is the rear. Furthermore, toward the front, the right side is right and the left side is left.

<First Embodiment>
[Composition of mower]
Hereinafter, the schematic configuration of the mower 100 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a plan view showing a configuration of a mower 100 according to the first embodiment. FIG. 2 is a side view illustrating the configuration of the mower 100 according to the first embodiment. FIG. 3 is a rear view illustrating the configuration of the mower 100 according to the first embodiment.

  The mower 100 according to the present embodiment includes a mounting unit 10, an offset mechanism unit 20, a power transmission unit 30, a working unit 40, a rotation mechanism unit 50, and a cover mechanism unit 60. Specifically, the mower 100 is connected to the traveling machine body 200 such as a tractor by the mounting unit 10. The mounting unit 10 and the working unit 40 are connected via the offset mechanism unit 20 and the power transmission unit 30. Thereby, the mower 100 is pulled according to the traveling of the traveling machine body 200, and the mowing work by the working unit 40 is performed.

  The mounting unit 10 is connected to a three-point link mechanism 220 (only the lower link is indicated by a dotted line here) provided between the two rear tires 210 of the traveling machine body 200 such as a tractor. The three-point link mechanism 220 is generally composed of a top link, a lift rod, and a lower link. Since the three-point link mechanism 220 is a known mechanism, a description thereof is omitted here.

  The mounting portion 10 includes a hitch frame 11 extending in the left-right direction, which is the width direction of the traveling aircraft body 200, and the hitch frame 11 is configured to be connectable to a three-point link mechanism 220 provided at the rear portion of the traveling aircraft body 200. . A gear box (not shown) is provided at the lower center of the hitch frame 11, and an input shaft (not shown) that receives power from the traveling machine body 200 is provided in the gear box. The input shaft is configured such that power is transmitted from a PTO shaft 230 provided in the traveling machine body 200 via a universal joint (not shown).

  The offset mechanism unit 20 is a mechanism for performing the offset movement of the working unit 40. Specifically, the offset mechanism unit 20 can move the working unit 40 to a position offset laterally with respect to the traveling direction of the traveling machine body 200. The offset mechanism unit 20 of this embodiment includes an offset frame 21, a link rod 22, a support frame 23, and a telescopic member 24.

  The offset frame 21 is a long frame made of a hollow member and is disposed below the power transmission unit 30. One end of the offset frame 21 is rotatably connected to the hitch frame 11 on a horizontal plane, and the other end is connected to the support frame 23.

  The link rod 22 is a long member composed of a cylindrical member and has a length comparable to that of the offset frame 21. One end of the link rod 22 is connected to the hitch frame 11 so as to be rotatable on a horizontal plane, and the other end is connected to the support frame 23. The connecting position of the offset frame 21 and the link rod 22 on the hitch frame 11 is different.

  The support frame 23 is a short member composed of a cylindrical member, and is a member that connects the offset frame 21 and the link rod 22 to each other. The offset frame 21 and the link rod 22 are connected to the support frame 23 so as to be rotatable. Further, the support frame 23 is disposed substantially parallel to the hitch frame 11.

  With the above configuration, the hitch frame 11, the offset frame 21, the link rod 22, and the support frame 23 constitute a parallelogram link mechanism having each side as a side. By this link mechanism, the offset mechanism unit 20 can offset the working unit 40.

  The expansion / contraction member 24 is a power source (actuator) of the offset mechanism unit 20 and includes, for example, a gas cylinder, a hydraulic cylinder, or the like. One end of the elastic member 24 is connected to the hitch frame 11, and the other end is connected to the rear side of the offset frame 21 (for example, in the vicinity of the connection portion with the support frame 23). The offset mechanism unit 20 is driven by the expansion / contraction of the expansion / contraction member 24, and the offset amount (movement amount in the offset direction) of the working unit 40 can be controlled.

  The power transmission unit 30 is a mechanism for transmitting power from the traveling machine body 200 received by an input shaft (not shown) of the mounting unit 10 to the working unit 40 side. The mower 100 of this embodiment is not a conventional universal joint but a chain drive mechanism as the power transmission unit 30. Specifically, the power transmission unit 30 includes at least a drive sprocket 31, a driven sprocket 32, and a roller chain 33. The roller chain 33 is configured to be wound around the drive sprocket 31 and the driven sprocket 32.

  The drive sprocket 31 is a gear that is actively rotated by the power received from the input shaft. The driven sprocket 32 is a gear that passively rotates with the rotational power transmitted from the drive sprocket 31 via the roller chain 33. The roller chain 33 is a mechanical element that transmits power and the like as tension.

  Here, the structure of the power transmission part 30 used for the mower 100 of this embodiment is demonstrated using FIG. FIG. 4 is a plan view illustrating a configuration of the power transmission unit 30 included in the mower 100 according to the first embodiment.

  In FIG. 4, a roller chain 33 is wound between the drive sprocket 31 and the driven sprocket 32. A part of the roller chain 33 is omitted by a dotted line. Here, a portion of the roller chain 33 that moves from the drive sprocket 31 toward the driven sprocket 32 is a portion that is pressed by the drive sprocket 31. For convenience of explanation, in this specification, this portion is referred to as a slack side 33a. Further, a portion of the roller chain 33 that moves from the driven sprocket 32 toward the drive sprocket 31 is a portion that is pulled by the drive sprocket 31. In this specification, this portion is referred to as the tension side 33b.

  The power transmission unit 30 of the present embodiment further includes a tensioner 34a disposed outside the slack side 33a of the roller chain 33 and a tensioner 34b disposed inside the slack side 33a of the roller chain 33. The outer side here is the outer side of the annular roller chain 33 (the region not surrounded by the roller chain 33), and the inner side is the inner side of the roller chain 33.

  The tensioner 34 a is pulled by the elastic force of the elastic member 35 and applies tension to the roller chain 33 from the outside toward the inside. In the present embodiment, a tension coil spring is used as the elastic member 35, but other spring members may be used.

  The tensioner 34b is disposed upstream of the tensioner 34a (that is, the side closer to the drive sprocket 31). The position of the tensioner 34b is fixed and functions as a guide member for fixing the track of the roller chain 33. Therefore, when the tensioner 34a applies tension to the roller chain 33 from the outside to the inside, the tensioner 34b relatively applies tension to the roller chain 33 from the inside to the outside.

  As described above, in this embodiment, tension is applied to the roller chain 33 using the tensioner 34a and the tensioner 34b, thereby preventing the roller chain 33 from slackening during power transmission and efficiently transmitting rotational power. be able to. Note that the tensioners 34a and 34b are not essential, and may be omitted, or the tensioner 34a alone may be provided.

  The drive sprocket 31, the driven sprocket 32, the roller chain 33, the tensioner 34 a, the tensioner 34 b and the elastic member 35 described above are accommodated in the chain case 36 and the outside thereof is covered with the chain cover 37. The power transmission unit 30 is disposed on a support member (not shown) mounted on the upper portion of the offset frame 21 and moves together with the offset frame 21. That is, in this embodiment, it can be said that the power transmission unit 30 constitutes a part of the offset mechanism unit 20.

  Further, when the chain drive system is adopted as the power transmission unit 30 as in the present embodiment, there is also an advantage that the rotation speed of the working rotor 41 can be easily changed by changing the diameter of the sprocket. That is, the rotational speed of the working rotor 41 and the torque can be improved by only a simple work of replacing the sprocket.

  Returning to FIGS. The working unit 40 is a part that actually performs mowing work, and includes a working rotor 41, a rotor cover 42, two side plates 43, and a cutting blade driving unit 44. The working unit 40 performs the mowing work by the cutting blade driving unit 44 receiving the power transmitted from the power transmission unit 30 and driving the work rotor 41.

  The working rotor 41 includes a rotating shaft 41a disposed between the side plates 43 and a plurality of cutting blades 41b provided radially on the rotating shaft 41a. The rotating shaft 41 a is provided in a horizontal direction orthogonal to the traveling direction of the traveling machine body 200. The working rotor 41 rotates the rotary shaft 41a and cuts weeds and the like with the cutting blade 41b.

  The rotor cover 42 is a cover member disposed so as to cover the work rotor 41. The rotor cover 42 prevents scattering of weeds cut by the cutting blade 41b, soil adhering to the weeds, pebbles falling on the work surface (ground surface), and returns the cut weeds back to the cutting blade 41b. , Has the effect of crushing finely.

  The rotor cover 42 has a front cover 42 a on the front side with respect to the traveling direction of the traveling machine body 200. The front cover 42 a is a cover for preventing pebbles and the like from scattering toward the front of the working unit 40. Usually, a plate-like elastic member made of an elastic member such as rubber is swingably arranged.

  The side plate 43 supports the rotor cover 42 while rotatably supporting the rotating shaft 41a via a ball bearing or the like. In the present embodiment, a cutting blade driving unit 44 is provided for the left side plate 43.

  The cutting blade drive unit 44 transmits the rotational power transmitted from the traveling machine body 200 via the power transmission unit 30 to the rotation shaft 41 a of the work rotor 41. As shown in FIG. 2, the cutting blade drive unit 44 of the present embodiment includes a drive pulley 44a, a driven pulley 44b, a belt 44c, and a tensioner 44d. The belt 44c is wound around the driving pulley 44a and the driven pulley 44b. The tensioner 44d is disposed on the side where the belt 44c is pushed from the drive pulley 44a toward the driven pulley 44b, and applies tension from the inside to the outside of the belt 44c.

  In the cutting blade drive unit 44 having the structure described above, the drive pulley 44a is rotated by the rotational power transmitted from the power transmission unit 30, and the rotational power is transmitted to the driven pulley 44b via the belt 44c. The driven pulley 44b transmits the rotational power given from the drive pulley 44a to the rotating shaft 41a, and drives the work rotor 41.

  The rotation mechanism unit 50 is a mechanism for rotating the working unit 40 about the axis when the traveling direction of the traveling machine body 200 is used as an axis. The power output from the power transmission unit 30 is transmitted to the cutting blade drive unit 44 via the first transmission shaft 51, the rotation mechanism unit 50, and the second transmission shaft 52. The rotation of the working unit 40 will be described later.

  The cover mechanism unit 60 is disposed on the front side of the working unit 40 (the traveling direction side of the traveling machine body 200), and prevents foreign matters such as soil and pebbles from scattering from the working unit 40 toward the traveling machine body 200 during mowing work. Play a role. Specifically, the cover mechanism unit 60 is arranged to prevent foreign matter struck by the cutting blade 41b from scattering forward when the work rotor 41 rotates. In particular, the cover mechanism unit 60 of the present embodiment can cover a range that cannot be covered by the front cover 42a when the working unit 40 performs mowing work on an inclined surface positioned below the traveling machine body 200. Has features. The detailed configuration of the cover mechanism unit 60 will be described later.

(Mower operation)
A state in which the working unit 40 of the mower 100 according to the first embodiment is offset is described. FIG. 5 is a plan view showing a normal working state of the mower 100 in the first embodiment. FIG. 6 is a rear view showing the configuration of the normal working state of the mower 100 according to the first embodiment.

  Here, “normal time” refers to a state in which the working unit 40 remains offset from the non-working state toward the working state. That is, the working unit 40 is offset to the side with respect to the traveling direction of the traveling machine body 200 and is in a position substantially parallel to the horizontal plane. For example, the state where the mowing operation of the farm scene where the traveling machine body 200 travels corresponds to the normal operation state.

  As shown in FIGS. 5 and 6, during the mowing operation, the working unit 40 is offset to the right with respect to the traveling direction of the traveling machine body 200 by driving the offset mechanism unit 20. As a result, the mowing work can be performed at a position offset laterally with respect to the traveling direction of the traveling machine body 200.

  At this time, the mower 100 according to the present embodiment can offset the working unit 40 to the extent that the power transmission unit 30 and the working unit 40 are connected on a substantially straight line. That is, as shown in FIGS. 5 and 6, the mowing operation can be performed in a state of being offset to the right by a larger amount than the rear tire 210 of the traveling machine body 200. This is because a chain drive system mechanism is used as the power transmission unit 30, and therefore, there is less restriction on the offset amount depending on the mechanism and structure of the power transmission unit 30 than when a general universal joint is used. Because.

  Furthermore, the mower 100 of this embodiment rotates in the state which the working part 40 moved offset. FIG. 7 is a rear view showing a state in which the working unit 40 of the mower 100 in the first embodiment is in a position rotated downward. FIG. 8 is a rear view showing a state in which the working unit 40 of the mower 100 in the first embodiment is in a position rotated upward.

  The mower 100 shown in FIG. 7 is rotated downward (clockwise) by the rotation mechanism unit 50 when the working unit 40 is offset. As described above, the rotation mechanism unit 50 is a mechanism for rotating the working unit 40 about the axis when the traveling direction of the traveling machine body 200 is used as an axis. The state shown in FIG. 7 can be said to be a state in which the working unit 40 is in a position to perform mowing work on an inclined surface (slope) located below the traveling machine body 200.

  Further, the mower 100 shown in FIG. 8 is rotated upward (counterclockwise) when the working unit 40 is offset. In this case, it can be said that the state shown in FIG. 8 is a state in which the working unit 40 is in a position to perform mowing work on an inclined surface (slope) located above the traveling machine body 200.

(Configuration of cover mechanism)
Here, the detailed structure and operation | movement of the cover mechanism part 60 with which the mower 100 in 1st Embodiment is provided are demonstrated using FIGS. FIG. 9 is a front view illustrating a normal working state of the mower 100 according to the first embodiment. FIG. 10 is a front view showing a state where the working unit 40 of the mower 100 in the first embodiment is in a position rotated downward. FIG. 11 is a front view illustrating a state where the working unit 40 of the mower 100 according to the first embodiment is in a position rotated upward.

  As shown in FIG. 9, the cover mechanism 60 in the mower 100 according to the present embodiment includes a cover member 61 and a link member 62. The cover member 61 is composed of a plate-like member, and has a substantially fan shape in the present embodiment. However, the shape is not limited to this, and can be determined as appropriate. As the material of the cover member 61, a metal material such as stainless steel can be used, and an elastic material such as rubber can be used.

  The link member 62 is a part having a function of changing the position of the cover member 61, and is configured by a first rod 62a and a second rod 62b in the present embodiment. In the link member 62, the first rod 62a and the second rod 62b cooperate to constitute a link mechanism. In the present embodiment, the link member 62 is installed between the working unit 40 and the rotation mechanism unit 50, but is not limited thereto. For example, the link member 62 may be provided between the working unit 40 and the offset mechanism unit 20 or between the working unit 40 and the power transmission unit 30.

  As shown in FIG. 9, the first rod 62a is fixed to the cover member 61 by fastening means 63 such as bolts. Further, one end of the first rod 62 a is connected to the rotor cover 42 of the working unit 40 so as to be rotatable about a shaft 64. One end of the second rod 62b is fixed to a part of the rotation mechanism portion 50 by fastening means 65 such as a bolt, and the other end is connected to the first rod 62a so as to be rotatable about the shaft 66. Is done.

  By adopting such a structure, the link member 62 is deformed as the working unit 40 is rotated by the rotation mechanism unit 50, and the position of the cover member 61 is changed. That is, the relative positional relationship between the cover member 61 and the working unit 40 changes according to the rotation position of the working unit 40. Specifically, in this embodiment, when the working unit 40 performs work on an inclined surface positioned below the traveling machine body 200, the cover member 61 scatters pebbles and the like toward the front of the working unit 40. It functions as a cover to prevent this.

  FIG. 9 shows a state in which the working unit 40 is mowing at a position substantially parallel to the horizontal plane (corresponding to the ground contact surface on which the traveling machine body 200 travels). That is, FIG. 9 shows a state of the working unit 40 in a normal working state. At this time, due to the positional relationship between the first rod 62 a and the second rod 62 b, the cover member 61 has a positional relationship in which the entire cover member 61 is superimposed on the working unit 40. Therefore, in the state shown in FIG. 9, the cover member 61 does not function as the cover described above, but is stored.

  Next, FIG. 10 shows an inclined surface 70b extending downward from the ground contact surface 70a on which the traveling machine body 200 is rotated by the working unit 40 rotating downward (here, counterclockwise) around the rotation mechanism unit 50. This shows how the mowing work is done. At this time, the first rod 62a rotates clockwise about the shaft 64 as the positional relationship between the first rod 62a and the second rod 62b changes due to the rotation of the working unit 40.

  As a result, the cover member 61 moves so as to have a positional relationship protruding from the working unit 40, and as shown in FIG. 10, a substantially triangular space formed between the ground contact surface 70a and the working unit 40. It will be a form to block. Therefore, when the working unit 40 works in the state shown in FIG. 10, even if the cutting blade 41 b of the work rotor 41 located above the ground contact surface 70 a blows off foreign matter such as pebbles, the cover member 61 Spattering can be prevented. That is, in the state shown in FIG. 10, the cover member 61 functions as a cover for blocking a gap formed between the grounding surface 70a and the working unit 40, separately from the front cover 42a.

  Next, in FIG. 11, the working unit 40 rotates upward (here, clockwise) about the rotation mechanism unit 50, and the inclined surface 70 c extending upward from the ground contact surface 70 a on which the traveling machine body 200 travels. It shows the state of mowing work. At this time, as the positional relationship between the first rod 62a and the second rod 62b changes due to the rotation of the working unit 40, the cover member 61 rotates slightly counterclockwise compared to the normal time (FIG. 9). . However, since the entire cover member 61 has a positional relationship superimposed on the working unit 40, the cover member 61 does not function as the above-described cover in the state shown in FIG.

  As described above, the mower 100 according to the present embodiment includes the cover member 61 whose relative positional relationship with the working unit 40 changes according to the rotation position of the working unit 40 (the posture of the working unit 40). Yes. Further, the position of the cover member 61 changes according to the movement of the link member 62 that deforms according to the rotation position of the working unit 40 (that is, in conjunction with the movement). Thereby, the cover member 61 provided in the mower 100 has a gap generated between the ground contact surface 70a and the working unit 40 when the working unit 40 is in a position to work on the inclined surface 70b below the traveling machine body 200. It functions as a cover that closes.

  On the other hand, when the working unit 40 is in a position to work on the inclined surface 70c above the traveling machine body 200, or when it is in a normal working state (that is, the working unit 40 is substantially parallel to the horizontal plane). When the cover member 61 is in the position, the cover member 61 is superimposed on the working unit 40 and is in the housed state. In the normal working state, the front cover 42a provided in the working unit 40 prevents foreign objects such as pebbles from scattering forward.

  As described above, the cover member 61 included in the mower 100 according to the present embodiment protrudes from the working unit 40 and has a gap only when the working unit 40 is in a position for working on the inclined surface 70b below the traveling machine body 200. When it is in other positions, it is superposed on the working unit 40 and stored. As described above, the mower 100 according to the present embodiment can prevent the scattering of foreign matter from the working unit 40 regardless of the working posture. In addition, although the power transmission part 30 with which the mower 100 of this embodiment is provided employ | adopts the mechanism of a chain drive system, of course, even if it is the structure using the conventional universal joint, it does not matter.

Second Embodiment
In the mower 100 according to the first embodiment, the position of the cover member 61 is changed in conjunction with the movement of the link member 62. However, the position is not limited to this, and the position may be changed manually, or the position may be changed electrically. You may let them.

  When manually changing the position of the cover member 61, as shown in FIG. 9, one end of the first rod 62a is connected to the working unit 40 so as to be rotatable about the shaft 64, What is necessary is just to provide the member which can fix the cover member 61 in 40 in arbitrary positions. Then, only when the working unit 40 is in a position to work on the inclined surface 70b below the traveling machine body 200, the cover member 61 is moved by hand and moved to a position protruding from the working unit 40 to function as a cover. It is possible.

  When the position of the cover member 61 is changed electrically, one end of the first rod 62 a is connected to the working unit 40 so as to be rotatable about the shaft 64, and the cover member 61 is attached to the working unit 40. What is necessary is just to arrange | position the actuator which can be rotated in arbitrary positions. Thus, if an actuator is used, it is possible to arrange the cover member 61 at an arbitrary position by driving the actuator with a remote controller or the like as necessary.

  The present invention has been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Mounting part, 11 ... Hitch frame, 20 ... Offset mechanism part, 21 ... Offset frame, 22 ... Link rod, 23 ... Support frame, 24 ... Telescopic member, 30 ... Power transmission part, 31 ... Drive sprocket, 32 ... Driven Sprocket, 33 ... roller chain, 34a, 34b ... tensioner, 35 ... elastic member, 36 ... chain case, 37 ... chain cover, 40 ... working part, 41 ... working rotor, 41a ... rotating shaft, 41b ... cutting blade, 42 ... Rotor cover, 43 ... side plate, 44 ... cutting blade drive, 44a ... drive pulley, 44b ... driven pulley, 44c ... belt, 44d ... tensioner, 50 ... rotating mechanism, 51 ... first transmission shaft, 52 ... second Transmission shaft, 60 ... cover mechanism, 61 ... cover member, 62 ... link member, 62a ... first rod, 62b ... second rod , 63 ... fastening means 64 ... axis 65 ... fastening means 66 ... axis 200 ... vehicle body, 210 ... rear tire, 220 ... three-point link mechanism, 230 ... PTO shaft

Claims (7)

A working unit that receives power from the traveling machine and performs mowing work;
An offset mechanism unit capable of moving the working unit to a position offset laterally with respect to the traveling direction of the traveling machine body;
A power transmission unit for transmitting the power to the working unit;
When the traveling direction of the traveling machine body is an axis, a rotation mechanism unit that rotates the working unit around the axis;
A cover mechanism portion having a cover member whose relative positional relationship with the working portion changes according to the rotation position of the working portion;
Including mower.   The mower according to claim 1, wherein the cover member is disposed on a front side of the working unit.   The mowing machine according to claim 1, wherein the cover mechanism further includes a link member that changes a position of the cover member.   The mowing machine according to claim 3, wherein the link member is installed between the working unit and the rotation mechanism unit.   The link member is fixed to the cover member and has one end rotatably connected to the working unit, one end rotatably connected to the rotation mechanism unit, and the other end The mowing machine according to claim 3, further comprising a second rod rotatably connected to the first rod.   2. When the working unit is viewed from the front, the cover member has a positional relationship protruding from the working unit when the working unit is in a position to work on an inclined surface below the traveling machine body. The mowing machine according to any one of claims 5 to 5.   When the working unit is viewed from the front, the cover member is located at a position where the working unit is in a position substantially parallel to a horizontal plane, or where the working unit works on an inclined surface above the traveling machine body. The mowing machine according to any one of claims 1 to 6, wherein the mowing machine has a positional relationship that is entirely superimposed on the working unit.

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